Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Virtual network driver for conversing with remote driver backends. |
| 3 | * |
| 4 | * Copyright (c) 2002-2005, K A Fraser |
| 5 | * Copyright (c) 2005, XenSource Ltd |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License version 2 |
| 9 | * as published by the Free Software Foundation; or, when distributed |
| 10 | * separately from the Linux kernel or incorporated into other |
| 11 | * software packages, subject to the following license: |
| 12 | * |
| 13 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 14 | * of this source file (the "Software"), to deal in the Software without |
| 15 | * restriction, including without limitation the rights to use, copy, modify, |
| 16 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 17 | * and to permit persons to whom the Software is furnished to do so, subject to |
| 18 | * the following conditions: |
| 19 | * |
| 20 | * The above copyright notice and this permission notice shall be included in |
| 21 | * all copies or substantial portions of the Software. |
| 22 | * |
| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 24 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 25 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 26 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 27 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 28 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| 29 | * IN THE SOFTWARE. |
| 30 | */ |
| 31 | |
Joe Perches | 383eda3 | 2013-06-27 21:57:49 -0700 | [diff] [blame] | 32 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 33 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 34 | #include <linux/module.h> |
| 35 | #include <linux/kernel.h> |
| 36 | #include <linux/netdevice.h> |
| 37 | #include <linux/etherdevice.h> |
| 38 | #include <linux/skbuff.h> |
| 39 | #include <linux/ethtool.h> |
| 40 | #include <linux/if_ether.h> |
Wei Liu | 9ecd1a7 | 2013-04-22 02:20:41 +0000 | [diff] [blame] | 41 | #include <net/tcp.h> |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 42 | #include <linux/udp.h> |
| 43 | #include <linux/moduleparam.h> |
| 44 | #include <linux/mm.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 45 | #include <linux/slab.h> |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 46 | #include <net/ip.h> |
| 47 | |
Jeremy Fitzhardinge | 1ccbf53 | 2009-10-06 15:11:14 -0700 | [diff] [blame] | 48 | #include <xen/xen.h> |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 49 | #include <xen/xenbus.h> |
| 50 | #include <xen/events.h> |
| 51 | #include <xen/page.h> |
Igor Mammedov | b9136d2 | 2012-03-21 15:08:38 +0100 | [diff] [blame] | 52 | #include <xen/platform_pci.h> |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 53 | #include <xen/grant_table.h> |
| 54 | |
| 55 | #include <xen/interface/io/netif.h> |
| 56 | #include <xen/interface/memory.h> |
| 57 | #include <xen/interface/grant_table.h> |
| 58 | |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 59 | /* Module parameters */ |
Juergen Gross | 034702a | 2017-01-10 14:32:51 +0100 | [diff] [blame] | 60 | #define MAX_QUEUES_DEFAULT 8 |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 61 | static unsigned int xennet_max_queues; |
| 62 | module_param_named(max_queues, xennet_max_queues, uint, 0644); |
| 63 | MODULE_PARM_DESC(max_queues, |
| 64 | "Maximum number of queues per virtual interface"); |
| 65 | |
Stephen Hemminger | 0fc0b73 | 2009-09-02 01:03:33 -0700 | [diff] [blame] | 66 | static const struct ethtool_ops xennet_ethtool_ops; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 67 | |
| 68 | struct netfront_cb { |
Ian Campbell | 3683243 | 2012-08-22 00:26:47 +0000 | [diff] [blame] | 69 | int pull_to; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 70 | }; |
| 71 | |
| 72 | #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) |
| 73 | |
| 74 | #define RX_COPY_THRESHOLD 256 |
| 75 | |
| 76 | #define GRANT_INVALID_REF 0 |
| 77 | |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 78 | #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE) |
| 79 | #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE) |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 80 | |
| 81 | /* Minimum number of Rx slots (includes slot for GSO metadata). */ |
| 82 | #define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 83 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 84 | /* Queue name is interface name with "-qNNN" appended */ |
| 85 | #define QUEUE_NAME_SIZE (IFNAMSIZ + 6) |
| 86 | |
| 87 | /* IRQ name is queue name with "-tx" or "-rx" appended */ |
| 88 | #define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3) |
| 89 | |
Juergen Gross | 8edfe2e | 2018-09-07 14:21:30 +0200 | [diff] [blame] | 90 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); |
Eduardo Otubo | 5b5971d | 2017-11-23 15:18:35 +0100 | [diff] [blame] | 91 | |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 92 | struct netfront_stats { |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 93 | u64 packets; |
| 94 | u64 bytes; |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 95 | struct u64_stats_sync syncp; |
| 96 | }; |
| 97 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 98 | struct netfront_info; |
| 99 | |
| 100 | struct netfront_queue { |
| 101 | unsigned int id; /* Queue ID, 0-based */ |
| 102 | char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */ |
| 103 | struct netfront_info *info; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 104 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 105 | struct napi_struct napi; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 106 | |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 107 | /* Split event channels support, tx_* == rx_* when using |
| 108 | * single event channel. |
| 109 | */ |
| 110 | unsigned int tx_evtchn, rx_evtchn; |
| 111 | unsigned int tx_irq, rx_irq; |
| 112 | /* Only used when split event channels support is enabled */ |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 113 | char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */ |
| 114 | char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */ |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 115 | |
| 116 | spinlock_t tx_lock; |
Jeremy Fitzhardinge | 84284d3 | 2007-10-15 12:59:53 -0700 | [diff] [blame] | 117 | struct xen_netif_tx_front_ring tx; |
| 118 | int tx_ring_ref; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 119 | |
| 120 | /* |
| 121 | * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries |
| 122 | * are linked from tx_skb_freelist through skb_entry.link. |
| 123 | * |
| 124 | * NB. Freelist index entries are always going to be less than |
| 125 | * PAGE_OFFSET, whereas pointers to skbs will always be equal or |
| 126 | * greater than PAGE_OFFSET: we use this property to distinguish |
| 127 | * them. |
| 128 | */ |
| 129 | union skb_entry { |
| 130 | struct sk_buff *skb; |
Isaku Yamahata | 1ffb40b | 2008-07-08 15:06:31 -0700 | [diff] [blame] | 131 | unsigned long link; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 132 | } tx_skbs[NET_TX_RING_SIZE]; |
| 133 | grant_ref_t gref_tx_head; |
| 134 | grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; |
Annie Li | cefe007 | 2014-01-28 11:35:42 +0800 | [diff] [blame] | 135 | struct page *grant_tx_page[NET_TX_RING_SIZE]; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 136 | unsigned tx_skb_freelist; |
| 137 | |
Jeremy Fitzhardinge | 84284d3 | 2007-10-15 12:59:53 -0700 | [diff] [blame] | 138 | spinlock_t rx_lock ____cacheline_aligned_in_smp; |
| 139 | struct xen_netif_rx_front_ring rx; |
| 140 | int rx_ring_ref; |
| 141 | |
Jeremy Fitzhardinge | 84284d3 | 2007-10-15 12:59:53 -0700 | [diff] [blame] | 142 | struct timer_list rx_refill_timer; |
| 143 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 144 | struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; |
| 145 | grant_ref_t gref_rx_head; |
| 146 | grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 147 | }; |
| 148 | |
| 149 | struct netfront_info { |
| 150 | struct list_head list; |
| 151 | struct net_device *netdev; |
| 152 | |
| 153 | struct xenbus_device *xbdev; |
| 154 | |
| 155 | /* Multi-queue support */ |
| 156 | struct netfront_queue *queues; |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 157 | |
| 158 | /* Statistics */ |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 159 | struct netfront_stats __percpu *rx_stats; |
| 160 | struct netfront_stats __percpu *tx_stats; |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 161 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 162 | atomic_t rx_gso_checksum_fixup; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 163 | }; |
| 164 | |
| 165 | struct netfront_rx_info { |
| 166 | struct xen_netif_rx_response rx; |
| 167 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; |
| 168 | }; |
| 169 | |
Isaku Yamahata | 1ffb40b | 2008-07-08 15:06:31 -0700 | [diff] [blame] | 170 | static void skb_entry_set_link(union skb_entry *list, unsigned short id) |
| 171 | { |
| 172 | list->link = id; |
| 173 | } |
| 174 | |
| 175 | static int skb_entry_is_link(const union skb_entry *list) |
| 176 | { |
| 177 | BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); |
Eric Dumazet | 807540b | 2010-09-23 05:40:09 +0000 | [diff] [blame] | 178 | return (unsigned long)list->skb < PAGE_OFFSET; |
Isaku Yamahata | 1ffb40b | 2008-07-08 15:06:31 -0700 | [diff] [blame] | 179 | } |
| 180 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 181 | /* |
| 182 | * Access macros for acquiring freeing slots in tx_skbs[]. |
| 183 | */ |
| 184 | |
| 185 | static void add_id_to_freelist(unsigned *head, union skb_entry *list, |
| 186 | unsigned short id) |
| 187 | { |
Isaku Yamahata | 1ffb40b | 2008-07-08 15:06:31 -0700 | [diff] [blame] | 188 | skb_entry_set_link(&list[id], *head); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 189 | *head = id; |
| 190 | } |
| 191 | |
| 192 | static unsigned short get_id_from_freelist(unsigned *head, |
| 193 | union skb_entry *list) |
| 194 | { |
| 195 | unsigned int id = *head; |
| 196 | *head = list[id].link; |
| 197 | return id; |
| 198 | } |
| 199 | |
| 200 | static int xennet_rxidx(RING_IDX idx) |
| 201 | { |
| 202 | return idx & (NET_RX_RING_SIZE - 1); |
| 203 | } |
| 204 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 205 | static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 206 | RING_IDX ri) |
| 207 | { |
| 208 | int i = xennet_rxidx(ri); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 209 | struct sk_buff *skb = queue->rx_skbs[i]; |
| 210 | queue->rx_skbs[i] = NULL; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 211 | return skb; |
| 212 | } |
| 213 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 214 | static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 215 | RING_IDX ri) |
| 216 | { |
| 217 | int i = xennet_rxidx(ri); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 218 | grant_ref_t ref = queue->grant_rx_ref[i]; |
| 219 | queue->grant_rx_ref[i] = GRANT_INVALID_REF; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 220 | return ref; |
| 221 | } |
| 222 | |
| 223 | #ifdef CONFIG_SYSFS |
Takashi Iwai | 27b917e | 2015-02-04 14:38:55 +0100 | [diff] [blame] | 224 | static const struct attribute_group xennet_dev_group; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 225 | #endif |
| 226 | |
Michał Mirosław | 3ad9b35 | 2011-11-16 14:05:33 +0000 | [diff] [blame] | 227 | static bool xennet_can_sg(struct net_device *dev) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 228 | { |
Michał Mirosław | 3ad9b35 | 2011-11-16 14:05:33 +0000 | [diff] [blame] | 229 | return dev->features & NETIF_F_SG; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | |
Kees Cook | e99e88a | 2017-10-16 14:43:17 -0700 | [diff] [blame] | 233 | static void rx_refill_timeout(struct timer_list *t) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 234 | { |
Kees Cook | e99e88a | 2017-10-16 14:43:17 -0700 | [diff] [blame] | 235 | struct netfront_queue *queue = from_timer(queue, t, rx_refill_timer); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 236 | napi_schedule(&queue->napi); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 237 | } |
| 238 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 239 | static int netfront_tx_slot_available(struct netfront_queue *queue) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 240 | { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 241 | return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) < |
Juergen Gross | 57f230a | 2018-06-12 08:57:53 +0200 | [diff] [blame] | 242 | (NET_TX_RING_SIZE - XEN_NETIF_NR_SLOTS_MIN - 1); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 243 | } |
| 244 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 245 | static void xennet_maybe_wake_tx(struct netfront_queue *queue) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 246 | { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 247 | struct net_device *dev = queue->info->netdev; |
| 248 | struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 249 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 250 | if (unlikely(netif_tx_queue_stopped(dev_queue)) && |
| 251 | netfront_tx_slot_available(queue) && |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 252 | likely(netif_running(dev))) |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 253 | netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id)); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 254 | } |
| 255 | |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 256 | |
| 257 | static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 258 | { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 259 | struct sk_buff *skb; |
| 260 | struct page *page; |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 261 | |
| 262 | skb = __netdev_alloc_skb(queue->info->netdev, |
| 263 | RX_COPY_THRESHOLD + NET_IP_ALIGN, |
| 264 | GFP_ATOMIC | __GFP_NOWARN); |
| 265 | if (unlikely(!skb)) |
| 266 | return NULL; |
| 267 | |
| 268 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); |
| 269 | if (!page) { |
| 270 | kfree_skb(skb); |
| 271 | return NULL; |
| 272 | } |
| 273 | skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE); |
| 274 | |
| 275 | /* Align ip header to a 16 bytes boundary */ |
| 276 | skb_reserve(skb, NET_IP_ALIGN); |
| 277 | skb->dev = queue->info->netdev; |
| 278 | |
| 279 | return skb; |
| 280 | } |
| 281 | |
| 282 | |
| 283 | static void xennet_alloc_rx_buffers(struct netfront_queue *queue) |
| 284 | { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 285 | RING_IDX req_prod = queue->rx.req_prod_pvt; |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 286 | int notify; |
Vineeth Remanan Pillai | 538d929 | 2017-02-07 18:59:01 +0000 | [diff] [blame] | 287 | int err = 0; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 288 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 289 | if (unlikely(!netif_carrier_ok(queue->info->netdev))) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 290 | return; |
| 291 | |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 292 | for (req_prod = queue->rx.req_prod_pvt; |
| 293 | req_prod - queue->rx.rsp_cons < NET_RX_RING_SIZE; |
| 294 | req_prod++) { |
| 295 | struct sk_buff *skb; |
| 296 | unsigned short id; |
| 297 | grant_ref_t ref; |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 298 | struct page *page; |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 299 | struct xen_netif_rx_request *req; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 300 | |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 301 | skb = xennet_alloc_one_rx_buffer(queue); |
Vineeth Remanan Pillai | 538d929 | 2017-02-07 18:59:01 +0000 | [diff] [blame] | 302 | if (!skb) { |
| 303 | err = -ENOMEM; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 304 | break; |
Vineeth Remanan Pillai | 538d929 | 2017-02-07 18:59:01 +0000 | [diff] [blame] | 305 | } |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 306 | |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 307 | id = xennet_rxidx(req_prod); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 308 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 309 | BUG_ON(queue->rx_skbs[id]); |
| 310 | queue->rx_skbs[id] = skb; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 311 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 312 | ref = gnttab_claim_grant_reference(&queue->gref_rx_head); |
Dongli Zhang | 269ebce | 2016-11-02 09:04:33 +0800 | [diff] [blame] | 313 | WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 314 | queue->grant_rx_ref[id] = ref; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 315 | |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 316 | page = skb_frag_page(&skb_shinfo(skb)->frags[0]); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 317 | |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 318 | req = RING_GET_REQUEST(&queue->rx, req_prod); |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 319 | gnttab_page_grant_foreign_access_ref_one(ref, |
| 320 | queue->info->xbdev->otherend_id, |
| 321 | page, |
| 322 | 0); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 323 | req->id = id; |
| 324 | req->gref = ref; |
| 325 | } |
| 326 | |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 327 | queue->rx.req_prod_pvt = req_prod; |
| 328 | |
Vineeth Remanan Pillai | 538d929 | 2017-02-07 18:59:01 +0000 | [diff] [blame] | 329 | /* Try again later if there are not enough requests or skb allocation |
| 330 | * failed. |
| 331 | * Enough requests is quantified as the sum of newly created slots and |
| 332 | * the unconsumed slots at the backend. |
| 333 | */ |
| 334 | if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN || |
| 335 | unlikely(err)) { |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 336 | mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10)); |
| 337 | return; |
| 338 | } |
| 339 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 340 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 341 | if (notify) |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 342 | notify_remote_via_irq(queue->rx_irq); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | static int xennet_open(struct net_device *dev) |
| 346 | { |
| 347 | struct netfront_info *np = netdev_priv(dev); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 348 | unsigned int num_queues = dev->real_num_tx_queues; |
| 349 | unsigned int i = 0; |
| 350 | struct netfront_queue *queue = NULL; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 351 | |
Ross Lagerwall | f599c64 | 2018-01-11 09:36:38 +0000 | [diff] [blame] | 352 | if (!np->queues) |
| 353 | return -ENODEV; |
| 354 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 355 | for (i = 0; i < num_queues; ++i) { |
| 356 | queue = &np->queues[i]; |
| 357 | napi_enable(&queue->napi); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 358 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 359 | spin_lock_bh(&queue->rx_lock); |
| 360 | if (netif_carrier_ok(dev)) { |
| 361 | xennet_alloc_rx_buffers(queue); |
| 362 | queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1; |
| 363 | if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)) |
| 364 | napi_schedule(&queue->napi); |
| 365 | } |
| 366 | spin_unlock_bh(&queue->rx_lock); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 367 | } |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 368 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 369 | netif_tx_start_all_queues(dev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 370 | |
| 371 | return 0; |
| 372 | } |
| 373 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 374 | static void xennet_tx_buf_gc(struct netfront_queue *queue) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 375 | { |
| 376 | RING_IDX cons, prod; |
| 377 | unsigned short id; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 378 | struct sk_buff *skb; |
Malcolm Crossley | 7d0105b | 2016-01-26 17:12:44 +0000 | [diff] [blame] | 379 | bool more_to_do; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 380 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 381 | BUG_ON(!netif_carrier_ok(queue->info->netdev)); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 382 | |
| 383 | do { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 384 | prod = queue->tx.sring->rsp_prod; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 385 | rmb(); /* Ensure we see responses up to 'rp'. */ |
| 386 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 387 | for (cons = queue->tx.rsp_cons; cons != prod; cons++) { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 388 | struct xen_netif_tx_response *txrsp; |
| 389 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 390 | txrsp = RING_GET_RESPONSE(&queue->tx, cons); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 391 | if (txrsp->status == XEN_NETIF_RSP_NULL) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 392 | continue; |
| 393 | |
| 394 | id = txrsp->id; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 395 | skb = queue->tx_skbs[id].skb; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 396 | if (unlikely(gnttab_query_foreign_access( |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 397 | queue->grant_tx_ref[id]) != 0)) { |
Joe Perches | 383eda3 | 2013-06-27 21:57:49 -0700 | [diff] [blame] | 398 | pr_alert("%s: warning -- grant still in use by backend domain\n", |
| 399 | __func__); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 400 | BUG(); |
| 401 | } |
| 402 | gnttab_end_foreign_access_ref( |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 403 | queue->grant_tx_ref[id], GNTMAP_readonly); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 404 | gnttab_release_grant_reference( |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 405 | &queue->gref_tx_head, queue->grant_tx_ref[id]); |
| 406 | queue->grant_tx_ref[id] = GRANT_INVALID_REF; |
| 407 | queue->grant_tx_page[id] = NULL; |
| 408 | add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, id); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 409 | dev_kfree_skb_irq(skb); |
| 410 | } |
| 411 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 412 | queue->tx.rsp_cons = prod; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 413 | |
Malcolm Crossley | 7d0105b | 2016-01-26 17:12:44 +0000 | [diff] [blame] | 414 | RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do); |
| 415 | } while (more_to_do); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 416 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 417 | xennet_maybe_wake_tx(queue); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 418 | } |
| 419 | |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 420 | struct xennet_gnttab_make_txreq { |
| 421 | struct netfront_queue *queue; |
| 422 | struct sk_buff *skb; |
| 423 | struct page *page; |
| 424 | struct xen_netif_tx_request *tx; /* Last request */ |
| 425 | unsigned int size; |
| 426 | }; |
| 427 | |
| 428 | static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset, |
| 429 | unsigned int len, void *data) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 430 | { |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 431 | struct xennet_gnttab_make_txreq *info = data; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 432 | unsigned int id; |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 433 | struct xen_netif_tx_request *tx; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 434 | grant_ref_t ref; |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 435 | /* convenient aliases */ |
| 436 | struct page *page = info->page; |
| 437 | struct netfront_queue *queue = info->queue; |
| 438 | struct sk_buff *skb = info->skb; |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 439 | |
| 440 | id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs); |
| 441 | tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); |
| 442 | ref = gnttab_claim_grant_reference(&queue->gref_tx_head); |
Dongli Zhang | 269ebce | 2016-11-02 09:04:33 +0800 | [diff] [blame] | 443 | WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 444 | |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 445 | gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id, |
| 446 | gfn, GNTMAP_readonly); |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 447 | |
| 448 | queue->tx_skbs[id].skb = skb; |
| 449 | queue->grant_tx_page[id] = page; |
| 450 | queue->grant_tx_ref[id] = ref; |
| 451 | |
| 452 | tx->id = id; |
| 453 | tx->gref = ref; |
| 454 | tx->offset = offset; |
| 455 | tx->size = len; |
| 456 | tx->flags = 0; |
| 457 | |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 458 | info->tx = tx; |
| 459 | info->size += tx->size; |
| 460 | } |
| 461 | |
| 462 | static struct xen_netif_tx_request *xennet_make_first_txreq( |
| 463 | struct netfront_queue *queue, struct sk_buff *skb, |
| 464 | struct page *page, unsigned int offset, unsigned int len) |
| 465 | { |
| 466 | struct xennet_gnttab_make_txreq info = { |
| 467 | .queue = queue, |
| 468 | .skb = skb, |
| 469 | .page = page, |
| 470 | .size = 0, |
| 471 | }; |
| 472 | |
| 473 | gnttab_for_one_grant(page, offset, len, xennet_tx_setup_grant, &info); |
| 474 | |
| 475 | return info.tx; |
| 476 | } |
| 477 | |
| 478 | static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset, |
| 479 | unsigned int len, void *data) |
| 480 | { |
| 481 | struct xennet_gnttab_make_txreq *info = data; |
| 482 | |
| 483 | info->tx->flags |= XEN_NETTXF_more_data; |
| 484 | skb_get(info->skb); |
| 485 | xennet_tx_setup_grant(gfn, offset, len, data); |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 486 | } |
| 487 | |
| 488 | static struct xen_netif_tx_request *xennet_make_txreqs( |
| 489 | struct netfront_queue *queue, struct xen_netif_tx_request *tx, |
| 490 | struct sk_buff *skb, struct page *page, |
| 491 | unsigned int offset, unsigned int len) |
| 492 | { |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 493 | struct xennet_gnttab_make_txreq info = { |
| 494 | .queue = queue, |
| 495 | .skb = skb, |
| 496 | .tx = tx, |
| 497 | }; |
| 498 | |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 499 | /* Skip unused frames from start of page */ |
| 500 | page += offset >> PAGE_SHIFT; |
| 501 | offset &= ~PAGE_MASK; |
| 502 | |
| 503 | while (len) { |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 504 | info.page = page; |
| 505 | info.size = 0; |
| 506 | |
| 507 | gnttab_foreach_grant_in_range(page, offset, len, |
| 508 | xennet_make_one_txreq, |
| 509 | &info); |
| 510 | |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 511 | page++; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 512 | offset = 0; |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 513 | len -= info.size; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 514 | } |
| 515 | |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 516 | return info.tx; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 517 | } |
| 518 | |
Ian Campbell | f36c374 | 2012-11-21 02:02:16 +0000 | [diff] [blame] | 519 | /* |
David Vrabel | e84448d | 2015-01-13 17:16:43 +0000 | [diff] [blame] | 520 | * Count how many ring slots are required to send this skb. Each frag |
| 521 | * might be a compound page. |
Ian Campbell | f36c374 | 2012-11-21 02:02:16 +0000 | [diff] [blame] | 522 | */ |
David Vrabel | e84448d | 2015-01-13 17:16:43 +0000 | [diff] [blame] | 523 | static int xennet_count_skb_slots(struct sk_buff *skb) |
Ian Campbell | f36c374 | 2012-11-21 02:02:16 +0000 | [diff] [blame] | 524 | { |
| 525 | int i, frags = skb_shinfo(skb)->nr_frags; |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 526 | int slots; |
David Vrabel | e84448d | 2015-01-13 17:16:43 +0000 | [diff] [blame] | 527 | |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 528 | slots = gnttab_count_grant(offset_in_page(skb->data), |
| 529 | skb_headlen(skb)); |
Ian Campbell | f36c374 | 2012-11-21 02:02:16 +0000 | [diff] [blame] | 530 | |
| 531 | for (i = 0; i < frags; i++) { |
| 532 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; |
| 533 | unsigned long size = skb_frag_size(frag); |
Jonathan Lemon | b54c9d5 | 2019-07-30 07:40:33 -0700 | [diff] [blame] | 534 | unsigned long offset = skb_frag_off(frag); |
Ian Campbell | f36c374 | 2012-11-21 02:02:16 +0000 | [diff] [blame] | 535 | |
| 536 | /* Skip unused frames from start of page */ |
| 537 | offset &= ~PAGE_MASK; |
| 538 | |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 539 | slots += gnttab_count_grant(offset, size); |
Ian Campbell | f36c374 | 2012-11-21 02:02:16 +0000 | [diff] [blame] | 540 | } |
| 541 | |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 542 | return slots; |
Ian Campbell | f36c374 | 2012-11-21 02:02:16 +0000 | [diff] [blame] | 543 | } |
| 544 | |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 545 | static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, |
Paolo Abeni | a350ecc | 2019-03-20 11:02:06 +0100 | [diff] [blame] | 546 | struct net_device *sb_dev) |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 547 | { |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 548 | unsigned int num_queues = dev->real_num_tx_queues; |
| 549 | u32 hash; |
| 550 | u16 queue_idx; |
| 551 | |
| 552 | /* First, check if there is only one queue */ |
| 553 | if (num_queues == 1) { |
| 554 | queue_idx = 0; |
| 555 | } else { |
| 556 | hash = skb_get_hash(skb); |
| 557 | queue_idx = hash % num_queues; |
| 558 | } |
| 559 | |
| 560 | return queue_idx; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 561 | } |
| 562 | |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 563 | #define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1) |
| 564 | |
Luc Van Oostenryck | 24a94b3 | 2018-04-24 15:18:14 +0200 | [diff] [blame] | 565 | static netdev_tx_t xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 566 | { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 567 | struct netfront_info *np = netdev_priv(dev); |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 568 | struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 569 | struct xen_netif_tx_request *tx, *first_tx; |
| 570 | unsigned int i; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 571 | int notify; |
Ian Campbell | f36c374 | 2012-11-21 02:02:16 +0000 | [diff] [blame] | 572 | int slots; |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 573 | struct page *page; |
| 574 | unsigned int offset; |
| 575 | unsigned int len; |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 576 | unsigned long flags; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 577 | struct netfront_queue *queue = NULL; |
| 578 | unsigned int num_queues = dev->real_num_tx_queues; |
| 579 | u16 queue_index; |
Vitaly Kuznetsov | fd07160 | 2016-09-19 12:53:40 +0200 | [diff] [blame] | 580 | struct sk_buff *nskb; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 581 | |
| 582 | /* Drop the packet if no queues are set up */ |
| 583 | if (num_queues < 1) |
| 584 | goto drop; |
| 585 | /* Determine which queue to transmit this SKB on */ |
| 586 | queue_index = skb_get_queue_mapping(skb); |
| 587 | queue = &np->queues[queue_index]; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 588 | |
Wei Liu | 9ecd1a7 | 2013-04-22 02:20:41 +0000 | [diff] [blame] | 589 | /* If skb->len is too big for wire format, drop skb and alert |
| 590 | * user about misconfiguration. |
| 591 | */ |
| 592 | if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { |
| 593 | net_alert_ratelimited( |
| 594 | "xennet: skb->len = %u, too big for wire format\n", |
| 595 | skb->len); |
| 596 | goto drop; |
| 597 | } |
| 598 | |
David Vrabel | e84448d | 2015-01-13 17:16:43 +0000 | [diff] [blame] | 599 | slots = xennet_count_skb_slots(skb); |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 600 | if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) { |
Zoltan Kiss | 97a6d1b | 2014-08-11 18:32:23 +0100 | [diff] [blame] | 601 | net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n", |
| 602 | slots, skb->len); |
| 603 | if (skb_linearize(skb)) |
| 604 | goto drop; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 605 | } |
| 606 | |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 607 | page = virt_to_page(skb->data); |
| 608 | offset = offset_in_page(skb->data); |
Vitaly Kuznetsov | fd07160 | 2016-09-19 12:53:40 +0200 | [diff] [blame] | 609 | |
| 610 | /* The first req should be at least ETH_HLEN size or the packet will be |
| 611 | * dropped by netback. |
| 612 | */ |
| 613 | if (unlikely(PAGE_SIZE - offset < ETH_HLEN)) { |
| 614 | nskb = skb_copy(skb, GFP_ATOMIC); |
| 615 | if (!nskb) |
| 616 | goto drop; |
Eric Dumazet | 62f3250 | 2017-08-30 10:32:58 -0700 | [diff] [blame] | 617 | dev_consume_skb_any(skb); |
Vitaly Kuznetsov | fd07160 | 2016-09-19 12:53:40 +0200 | [diff] [blame] | 618 | skb = nskb; |
| 619 | page = virt_to_page(skb->data); |
| 620 | offset = offset_in_page(skb->data); |
| 621 | } |
| 622 | |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 623 | len = skb_headlen(skb); |
| 624 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 625 | spin_lock_irqsave(&queue->tx_lock, flags); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 626 | |
| 627 | if (unlikely(!netif_carrier_ok(dev) || |
Ian Campbell | f36c374 | 2012-11-21 02:02:16 +0000 | [diff] [blame] | 628 | (slots > 1 && !xennet_can_sg(dev)) || |
Johannes Berg | 8b86a61 | 2015-04-17 15:45:04 +0200 | [diff] [blame] | 629 | netif_needs_gso(skb, netif_skb_features(skb)))) { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 630 | spin_unlock_irqrestore(&queue->tx_lock, flags); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 631 | goto drop; |
| 632 | } |
| 633 | |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 634 | /* First request for the linear area. */ |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 635 | first_tx = tx = xennet_make_first_txreq(queue, skb, |
| 636 | page, offset, len); |
| 637 | offset += tx->size; |
| 638 | if (offset == PAGE_SIZE) { |
| 639 | page++; |
| 640 | offset = 0; |
| 641 | } |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 642 | len -= tx->size; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 643 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 644 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 645 | /* local packet? */ |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 646 | tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 647 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
| 648 | /* remote but checksummed. */ |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 649 | tx->flags |= XEN_NETTXF_data_validated; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 650 | |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 651 | /* Optional extra info after the first request. */ |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 652 | if (skb_shinfo(skb)->gso_size) { |
| 653 | struct xen_netif_extra_info *gso; |
| 654 | |
| 655 | gso = (struct xen_netif_extra_info *) |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 656 | RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 657 | |
Wei Liu | e2d617c | 2013-03-25 01:08:17 +0000 | [diff] [blame] | 658 | tx->flags |= XEN_NETTXF_extra_info; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 659 | |
| 660 | gso->u.gso.size = skb_shinfo(skb)->gso_size; |
Paul Durrant | 2c0057d | 2014-01-15 17:30:33 +0000 | [diff] [blame] | 661 | gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ? |
| 662 | XEN_NETIF_GSO_TYPE_TCPV6 : |
| 663 | XEN_NETIF_GSO_TYPE_TCPV4; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 664 | gso->u.gso.pad = 0; |
| 665 | gso->u.gso.features = 0; |
| 666 | |
| 667 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; |
| 668 | gso->flags = 0; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 669 | } |
| 670 | |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 671 | /* Requests for the rest of the linear area. */ |
| 672 | tx = xennet_make_txreqs(queue, tx, skb, page, offset, len); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 673 | |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 674 | /* Requests for all the frags. */ |
| 675 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| 676 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
Jonathan Lemon | b54c9d5 | 2019-07-30 07:40:33 -0700 | [diff] [blame] | 677 | tx = xennet_make_txreqs(queue, tx, skb, skb_frag_page(frag), |
| 678 | skb_frag_off(frag), |
David Vrabel | a55e8bb | 2015-01-13 17:16:44 +0000 | [diff] [blame] | 679 | skb_frag_size(frag)); |
| 680 | } |
| 681 | |
| 682 | /* First request has the packet length. */ |
| 683 | first_tx->size = skb->len; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 684 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 685 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 686 | if (notify) |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 687 | notify_remote_via_irq(queue->tx_irq); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 688 | |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 689 | u64_stats_update_begin(&tx_stats->syncp); |
| 690 | tx_stats->bytes += skb->len; |
| 691 | tx_stats->packets++; |
| 692 | u64_stats_update_end(&tx_stats->syncp); |
Jeremy Fitzhardinge | 10a273a | 2007-08-13 12:54:37 -0700 | [diff] [blame] | 693 | |
| 694 | /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 695 | xennet_tx_buf_gc(queue); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 696 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 697 | if (!netfront_tx_slot_available(queue)) |
| 698 | netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id)); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 699 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 700 | spin_unlock_irqrestore(&queue->tx_lock, flags); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 701 | |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 702 | return NETDEV_TX_OK; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 703 | |
| 704 | drop: |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 705 | dev->stats.tx_dropped++; |
Eric W. Biederman | 979de8a | 2014-03-15 18:33:04 -0700 | [diff] [blame] | 706 | dev_kfree_skb_any(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 707 | return NETDEV_TX_OK; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 708 | } |
| 709 | |
| 710 | static int xennet_close(struct net_device *dev) |
| 711 | { |
| 712 | struct netfront_info *np = netdev_priv(dev); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 713 | unsigned int num_queues = dev->real_num_tx_queues; |
| 714 | unsigned int i; |
| 715 | struct netfront_queue *queue; |
| 716 | netif_tx_stop_all_queues(np->netdev); |
| 717 | for (i = 0; i < num_queues; ++i) { |
| 718 | queue = &np->queues[i]; |
| 719 | napi_disable(&queue->napi); |
| 720 | } |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 721 | return 0; |
| 722 | } |
| 723 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 724 | static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 725 | grant_ref_t ref) |
| 726 | { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 727 | int new = xennet_rxidx(queue->rx.req_prod_pvt); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 728 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 729 | BUG_ON(queue->rx_skbs[new]); |
| 730 | queue->rx_skbs[new] = skb; |
| 731 | queue->grant_rx_ref[new] = ref; |
| 732 | RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new; |
| 733 | RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref; |
| 734 | queue->rx.req_prod_pvt++; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 735 | } |
| 736 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 737 | static int xennet_get_extras(struct netfront_queue *queue, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 738 | struct xen_netif_extra_info *extras, |
| 739 | RING_IDX rp) |
| 740 | |
| 741 | { |
| 742 | struct xen_netif_extra_info *extra; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 743 | struct device *dev = &queue->info->netdev->dev; |
| 744 | RING_IDX cons = queue->rx.rsp_cons; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 745 | int err = 0; |
| 746 | |
| 747 | do { |
| 748 | struct sk_buff *skb; |
| 749 | grant_ref_t ref; |
| 750 | |
| 751 | if (unlikely(cons + 1 == rp)) { |
| 752 | if (net_ratelimit()) |
| 753 | dev_warn(dev, "Missing extra info\n"); |
| 754 | err = -EBADR; |
| 755 | break; |
| 756 | } |
| 757 | |
| 758 | extra = (struct xen_netif_extra_info *) |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 759 | RING_GET_RESPONSE(&queue->rx, ++cons); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 760 | |
| 761 | if (unlikely(!extra->type || |
| 762 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { |
| 763 | if (net_ratelimit()) |
| 764 | dev_warn(dev, "Invalid extra type: %d\n", |
| 765 | extra->type); |
| 766 | err = -EINVAL; |
| 767 | } else { |
| 768 | memcpy(&extras[extra->type - 1], extra, |
| 769 | sizeof(*extra)); |
| 770 | } |
| 771 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 772 | skb = xennet_get_rx_skb(queue, cons); |
| 773 | ref = xennet_get_rx_ref(queue, cons); |
| 774 | xennet_move_rx_slot(queue, skb, ref); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 775 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); |
| 776 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 777 | queue->rx.rsp_cons = cons; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 778 | return err; |
| 779 | } |
| 780 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 781 | static int xennet_get_responses(struct netfront_queue *queue, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 782 | struct netfront_rx_info *rinfo, RING_IDX rp, |
| 783 | struct sk_buff_head *list) |
| 784 | { |
| 785 | struct xen_netif_rx_response *rx = &rinfo->rx; |
| 786 | struct xen_netif_extra_info *extras = rinfo->extras; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 787 | struct device *dev = &queue->info->netdev->dev; |
| 788 | RING_IDX cons = queue->rx.rsp_cons; |
| 789 | struct sk_buff *skb = xennet_get_rx_skb(queue, cons); |
| 790 | grant_ref_t ref = xennet_get_rx_ref(queue, cons); |
Juergen Gross | 57f230a | 2018-06-12 08:57:53 +0200 | [diff] [blame] | 791 | int max = XEN_NETIF_NR_SLOTS_MIN + (rx->status <= RX_COPY_THRESHOLD); |
Wei Liu | 7158ff6 | 2013-03-25 01:08:19 +0000 | [diff] [blame] | 792 | int slots = 1; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 793 | int err = 0; |
| 794 | unsigned long ret; |
| 795 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 796 | if (rx->flags & XEN_NETRXF_extra_info) { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 797 | err = xennet_get_extras(queue, extras, rp); |
| 798 | cons = queue->rx.rsp_cons; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 799 | } |
| 800 | |
| 801 | for (;;) { |
| 802 | if (unlikely(rx->status < 0 || |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 803 | rx->offset + rx->status > XEN_PAGE_SIZE)) { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 804 | if (net_ratelimit()) |
Julien Grall | 6c10127 | 2015-06-16 20:10:46 +0100 | [diff] [blame] | 805 | dev_warn(dev, "rx->offset: %u, size: %d\n", |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 806 | rx->offset, rx->status); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 807 | xennet_move_rx_slot(queue, skb, ref); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 808 | err = -EINVAL; |
| 809 | goto next; |
| 810 | } |
| 811 | |
| 812 | /* |
| 813 | * This definitely indicates a bug, either in this driver or in |
| 814 | * the backend driver. In future this should flag the bad |
Wei Liu | 697089d | 2013-04-22 02:20:40 +0000 | [diff] [blame] | 815 | * situation to the system controller to reboot the backend. |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 816 | */ |
| 817 | if (ref == GRANT_INVALID_REF) { |
| 818 | if (net_ratelimit()) |
| 819 | dev_warn(dev, "Bad rx response id %d.\n", |
| 820 | rx->id); |
| 821 | err = -EINVAL; |
| 822 | goto next; |
| 823 | } |
| 824 | |
| 825 | ret = gnttab_end_foreign_access_ref(ref, 0); |
| 826 | BUG_ON(!ret); |
| 827 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 828 | gnttab_release_grant_reference(&queue->gref_rx_head, ref); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 829 | |
| 830 | __skb_queue_tail(list, skb); |
| 831 | |
| 832 | next: |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 833 | if (!(rx->flags & XEN_NETRXF_more_data)) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 834 | break; |
| 835 | |
Wei Liu | 7158ff6 | 2013-03-25 01:08:19 +0000 | [diff] [blame] | 836 | if (cons + slots == rp) { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 837 | if (net_ratelimit()) |
Wei Liu | 7158ff6 | 2013-03-25 01:08:19 +0000 | [diff] [blame] | 838 | dev_warn(dev, "Need more slots\n"); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 839 | err = -ENOENT; |
| 840 | break; |
| 841 | } |
| 842 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 843 | rx = RING_GET_RESPONSE(&queue->rx, cons + slots); |
| 844 | skb = xennet_get_rx_skb(queue, cons + slots); |
| 845 | ref = xennet_get_rx_ref(queue, cons + slots); |
Wei Liu | 7158ff6 | 2013-03-25 01:08:19 +0000 | [diff] [blame] | 846 | slots++; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 847 | } |
| 848 | |
Wei Liu | 7158ff6 | 2013-03-25 01:08:19 +0000 | [diff] [blame] | 849 | if (unlikely(slots > max)) { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 850 | if (net_ratelimit()) |
Wei Liu | 697089d | 2013-04-22 02:20:40 +0000 | [diff] [blame] | 851 | dev_warn(dev, "Too many slots\n"); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 852 | err = -E2BIG; |
| 853 | } |
| 854 | |
| 855 | if (unlikely(err)) |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 856 | queue->rx.rsp_cons = cons + slots; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 857 | |
| 858 | return err; |
| 859 | } |
| 860 | |
| 861 | static int xennet_set_skb_gso(struct sk_buff *skb, |
| 862 | struct xen_netif_extra_info *gso) |
| 863 | { |
| 864 | if (!gso->u.gso.size) { |
| 865 | if (net_ratelimit()) |
Joe Perches | 383eda3 | 2013-06-27 21:57:49 -0700 | [diff] [blame] | 866 | pr_warn("GSO size must not be zero\n"); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 867 | return -EINVAL; |
| 868 | } |
| 869 | |
Paul Durrant | 2c0057d | 2014-01-15 17:30:33 +0000 | [diff] [blame] | 870 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 && |
| 871 | gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 872 | if (net_ratelimit()) |
Joe Perches | 383eda3 | 2013-06-27 21:57:49 -0700 | [diff] [blame] | 873 | pr_warn("Bad GSO type %d\n", gso->u.gso.type); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 874 | return -EINVAL; |
| 875 | } |
| 876 | |
| 877 | skb_shinfo(skb)->gso_size = gso->u.gso.size; |
Paul Durrant | 2c0057d | 2014-01-15 17:30:33 +0000 | [diff] [blame] | 878 | skb_shinfo(skb)->gso_type = |
| 879 | (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ? |
| 880 | SKB_GSO_TCPV4 : |
| 881 | SKB_GSO_TCPV6; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 882 | |
| 883 | /* Header must be checked, and gso_segs computed. */ |
| 884 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 885 | skb_shinfo(skb)->gso_segs = 0; |
| 886 | |
| 887 | return 0; |
| 888 | } |
| 889 | |
Dongli Zhang | a761129 | 2019-10-01 21:56:41 +0800 | [diff] [blame] | 890 | static int xennet_fill_frags(struct netfront_queue *queue, |
| 891 | struct sk_buff *skb, |
| 892 | struct sk_buff_head *list) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 893 | { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 894 | RING_IDX cons = queue->rx.rsp_cons; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 895 | struct sk_buff *nskb; |
| 896 | |
| 897 | while ((nskb = __skb_dequeue(list))) { |
| 898 | struct xen_netif_rx_response *rx = |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 899 | RING_GET_RESPONSE(&queue->rx, ++cons); |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 900 | skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 901 | |
Juergen Gross | d472b3a | 2018-08-09 16:42:16 +0200 | [diff] [blame] | 902 | if (skb_shinfo(skb)->nr_frags == MAX_SKB_FRAGS) { |
Jan Beulich | 093b9c7 | 2013-07-17 08:09:37 +0100 | [diff] [blame] | 903 | unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 904 | |
Juergen Gross | d81c505 | 2018-12-18 16:06:19 +0100 | [diff] [blame] | 905 | BUG_ON(pull_to < skb_headlen(skb)); |
Jan Beulich | 093b9c7 | 2013-07-17 08:09:37 +0100 | [diff] [blame] | 906 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); |
| 907 | } |
Juergen Gross | ad4f15d | 2018-09-11 09:04:48 +0200 | [diff] [blame] | 908 | if (unlikely(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) { |
Dongli Zhang | 00b3685 | 2019-09-16 11:46:59 +0800 | [diff] [blame] | 909 | queue->rx.rsp_cons = ++cons + skb_queue_len(list); |
Juergen Gross | ad4f15d | 2018-09-11 09:04:48 +0200 | [diff] [blame] | 910 | kfree_skb(nskb); |
Dongli Zhang | a761129 | 2019-10-01 21:56:41 +0800 | [diff] [blame] | 911 | return -ENOENT; |
Juergen Gross | ad4f15d | 2018-09-11 09:04:48 +0200 | [diff] [blame] | 912 | } |
Jan Beulich | 093b9c7 | 2013-07-17 08:09:37 +0100 | [diff] [blame] | 913 | |
Juergen Gross | d472b3a | 2018-08-09 16:42:16 +0200 | [diff] [blame] | 914 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, |
| 915 | skb_frag_page(nfrag), |
Jan Beulich | 093b9c7 | 2013-07-17 08:09:37 +0100 | [diff] [blame] | 916 | rx->offset, rx->status, PAGE_SIZE); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 917 | |
| 918 | skb_shinfo(nskb)->nr_frags = 0; |
| 919 | kfree_skb(nskb); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 920 | } |
| 921 | |
Dongli Zhang | a761129 | 2019-10-01 21:56:41 +0800 | [diff] [blame] | 922 | queue->rx.rsp_cons = cons; |
| 923 | |
| 924 | return 0; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 925 | } |
| 926 | |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 927 | static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 928 | { |
Paul Durrant | b5cf66c | 2014-01-09 10:02:48 +0000 | [diff] [blame] | 929 | bool recalculate_partial_csum = false; |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 930 | |
| 931 | /* |
| 932 | * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy |
| 933 | * peers can fail to set NETRXF_csum_blank when sending a GSO |
| 934 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and |
| 935 | * recalculate the partial checksum. |
| 936 | */ |
| 937 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { |
| 938 | struct netfront_info *np = netdev_priv(dev); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 939 | atomic_inc(&np->rx_gso_checksum_fixup); |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 940 | skb->ip_summed = CHECKSUM_PARTIAL; |
Paul Durrant | b5cf66c | 2014-01-09 10:02:48 +0000 | [diff] [blame] | 941 | recalculate_partial_csum = true; |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 942 | } |
| 943 | |
| 944 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ |
| 945 | if (skb->ip_summed != CHECKSUM_PARTIAL) |
| 946 | return 0; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 947 | |
Paul Durrant | b5cf66c | 2014-01-09 10:02:48 +0000 | [diff] [blame] | 948 | return skb_checksum_setup(skb, recalculate_partial_csum); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 949 | } |
| 950 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 951 | static int handle_incoming_queue(struct netfront_queue *queue, |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 952 | struct sk_buff_head *rxq) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 953 | { |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 954 | struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 955 | int packets_dropped = 0; |
| 956 | struct sk_buff *skb; |
| 957 | |
| 958 | while ((skb = __skb_dequeue(rxq)) != NULL) { |
Ian Campbell | 3683243 | 2012-08-22 00:26:47 +0000 | [diff] [blame] | 959 | int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 960 | |
Jan Beulich | 093b9c7 | 2013-07-17 08:09:37 +0100 | [diff] [blame] | 961 | if (pull_to > skb_headlen(skb)) |
| 962 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 963 | |
| 964 | /* Ethernet work: Delayed to here as it peeks the header. */ |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 965 | skb->protocol = eth_type_trans(skb, queue->info->netdev); |
Wei Liu | d554f73 | 2014-02-19 18:48:34 +0000 | [diff] [blame] | 966 | skb_reset_network_header(skb); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 967 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 968 | if (checksum_setup(queue->info->netdev, skb)) { |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 969 | kfree_skb(skb); |
| 970 | packets_dropped++; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 971 | queue->info->netdev->stats.rx_errors++; |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 972 | continue; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 973 | } |
| 974 | |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 975 | u64_stats_update_begin(&rx_stats->syncp); |
| 976 | rx_stats->packets++; |
| 977 | rx_stats->bytes += skb->len; |
| 978 | u64_stats_update_end(&rx_stats->syncp); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 979 | |
| 980 | /* Pass it up. */ |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 981 | napi_gro_receive(&queue->napi, skb); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 982 | } |
| 983 | |
| 984 | return packets_dropped; |
| 985 | } |
| 986 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 987 | static int xennet_poll(struct napi_struct *napi, int budget) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 988 | { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 989 | struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi); |
| 990 | struct net_device *dev = queue->info->netdev; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 991 | struct sk_buff *skb; |
| 992 | struct netfront_rx_info rinfo; |
| 993 | struct xen_netif_rx_response *rx = &rinfo.rx; |
| 994 | struct xen_netif_extra_info *extras = rinfo.extras; |
| 995 | RING_IDX i, rp; |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 996 | int work_done; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 997 | struct sk_buff_head rxq; |
| 998 | struct sk_buff_head errq; |
| 999 | struct sk_buff_head tmpq; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1000 | int err; |
| 1001 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1002 | spin_lock(&queue->rx_lock); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1003 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1004 | skb_queue_head_init(&rxq); |
| 1005 | skb_queue_head_init(&errq); |
| 1006 | skb_queue_head_init(&tmpq); |
| 1007 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1008 | rp = queue->rx.sring->rsp_prod; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1009 | rmb(); /* Ensure we see queued responses up to 'rp'. */ |
| 1010 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1011 | i = queue->rx.rsp_cons; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1012 | work_done = 0; |
| 1013 | while ((i != rp) && (work_done < budget)) { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1014 | memcpy(rx, RING_GET_RESPONSE(&queue->rx, i), sizeof(*rx)); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1015 | memset(extras, 0, sizeof(rinfo.extras)); |
| 1016 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1017 | err = xennet_get_responses(queue, &rinfo, rp, &tmpq); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1018 | |
| 1019 | if (unlikely(err)) { |
| 1020 | err: |
| 1021 | while ((skb = __skb_dequeue(&tmpq))) |
| 1022 | __skb_queue_tail(&errq, skb); |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 1023 | dev->stats.rx_errors++; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1024 | i = queue->rx.rsp_cons; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1025 | continue; |
| 1026 | } |
| 1027 | |
| 1028 | skb = __skb_dequeue(&tmpq); |
| 1029 | |
| 1030 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { |
| 1031 | struct xen_netif_extra_info *gso; |
| 1032 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; |
| 1033 | |
| 1034 | if (unlikely(xennet_set_skb_gso(skb, gso))) { |
| 1035 | __skb_queue_head(&tmpq, skb); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1036 | queue->rx.rsp_cons += skb_queue_len(&tmpq); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1037 | goto err; |
| 1038 | } |
| 1039 | } |
| 1040 | |
Ian Campbell | 3683243 | 2012-08-22 00:26:47 +0000 | [diff] [blame] | 1041 | NETFRONT_SKB_CB(skb)->pull_to = rx->status; |
| 1042 | if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) |
| 1043 | NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1044 | |
Jonathan Lemon | b54c9d5 | 2019-07-30 07:40:33 -0700 | [diff] [blame] | 1045 | skb_frag_off_set(&skb_shinfo(skb)->frags[0], rx->offset); |
Ian Campbell | 3683243 | 2012-08-22 00:26:47 +0000 | [diff] [blame] | 1046 | skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); |
| 1047 | skb->data_len = rx->status; |
Jan Beulich | 093b9c7 | 2013-07-17 08:09:37 +0100 | [diff] [blame] | 1048 | skb->len += rx->status; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1049 | |
Dongli Zhang | a761129 | 2019-10-01 21:56:41 +0800 | [diff] [blame] | 1050 | if (unlikely(xennet_fill_frags(queue, skb, &tmpq))) |
Juergen Gross | ad4f15d | 2018-09-11 09:04:48 +0200 | [diff] [blame] | 1051 | goto err; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1052 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1053 | if (rx->flags & XEN_NETRXF_csum_blank) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1054 | skb->ip_summed = CHECKSUM_PARTIAL; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1055 | else if (rx->flags & XEN_NETRXF_data_validated) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1056 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 1057 | |
| 1058 | __skb_queue_tail(&rxq, skb); |
| 1059 | |
Dongli Zhang | a761129 | 2019-10-01 21:56:41 +0800 | [diff] [blame] | 1060 | i = ++queue->rx.rsp_cons; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1061 | work_done++; |
| 1062 | } |
| 1063 | |
Wang Chen | 56cfe5d | 2008-05-22 18:09:06 +0800 | [diff] [blame] | 1064 | __skb_queue_purge(&errq); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1065 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1066 | work_done -= handle_incoming_queue(queue, &rxq); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1067 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1068 | xennet_alloc_rx_buffers(queue); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1069 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1070 | if (work_done < budget) { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1071 | int more_to_do = 0; |
| 1072 | |
Eric Dumazet | 6ad2016 | 2017-01-30 08:22:01 -0800 | [diff] [blame] | 1073 | napi_complete_done(napi, work_done); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1074 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1075 | RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do); |
David Vrabel | 6a6dc08 | 2014-12-16 18:59:46 +0000 | [diff] [blame] | 1076 | if (more_to_do) |
| 1077 | napi_schedule(napi); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1078 | } |
| 1079 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1080 | spin_unlock(&queue->rx_lock); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1081 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1082 | return work_done; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1083 | } |
| 1084 | |
| 1085 | static int xennet_change_mtu(struct net_device *dev, int mtu) |
| 1086 | { |
Jonathan Davies | 0c36820 | 2015-03-31 11:05:15 +0100 | [diff] [blame] | 1087 | int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1088 | |
| 1089 | if (mtu > max) |
| 1090 | return -EINVAL; |
| 1091 | dev->mtu = mtu; |
| 1092 | return 0; |
| 1093 | } |
| 1094 | |
stephen hemminger | bc1f447 | 2017-01-06 19:12:52 -0800 | [diff] [blame] | 1095 | static void xennet_get_stats64(struct net_device *dev, |
| 1096 | struct rtnl_link_stats64 *tot) |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1097 | { |
| 1098 | struct netfront_info *np = netdev_priv(dev); |
| 1099 | int cpu; |
| 1100 | |
| 1101 | for_each_possible_cpu(cpu) { |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 1102 | struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu); |
| 1103 | struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu); |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1104 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
| 1105 | unsigned int start; |
| 1106 | |
| 1107 | do { |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 1108 | start = u64_stats_fetch_begin_irq(&tx_stats->syncp); |
| 1109 | tx_packets = tx_stats->packets; |
| 1110 | tx_bytes = tx_stats->bytes; |
| 1111 | } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1112 | |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 1113 | do { |
| 1114 | start = u64_stats_fetch_begin_irq(&rx_stats->syncp); |
| 1115 | rx_packets = rx_stats->packets; |
| 1116 | rx_bytes = rx_stats->bytes; |
| 1117 | } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1118 | |
| 1119 | tot->rx_packets += rx_packets; |
| 1120 | tot->tx_packets += tx_packets; |
| 1121 | tot->rx_bytes += rx_bytes; |
| 1122 | tot->tx_bytes += tx_bytes; |
| 1123 | } |
| 1124 | |
| 1125 | tot->rx_errors = dev->stats.rx_errors; |
| 1126 | tot->tx_dropped = dev->stats.tx_dropped; |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1127 | } |
| 1128 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1129 | static void xennet_release_tx_bufs(struct netfront_queue *queue) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1130 | { |
| 1131 | struct sk_buff *skb; |
| 1132 | int i; |
| 1133 | |
| 1134 | for (i = 0; i < NET_TX_RING_SIZE; i++) { |
| 1135 | /* Skip over entries which are actually freelist references */ |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1136 | if (skb_entry_is_link(&queue->tx_skbs[i])) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1137 | continue; |
| 1138 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1139 | skb = queue->tx_skbs[i].skb; |
| 1140 | get_page(queue->grant_tx_page[i]); |
| 1141 | gnttab_end_foreign_access(queue->grant_tx_ref[i], |
Annie Li | cefe007 | 2014-01-28 11:35:42 +0800 | [diff] [blame] | 1142 | GNTMAP_readonly, |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1143 | (unsigned long)page_address(queue->grant_tx_page[i])); |
| 1144 | queue->grant_tx_page[i] = NULL; |
| 1145 | queue->grant_tx_ref[i] = GRANT_INVALID_REF; |
| 1146 | add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, i); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1147 | dev_kfree_skb_irq(skb); |
| 1148 | } |
| 1149 | } |
| 1150 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1151 | static void xennet_release_rx_bufs(struct netfront_queue *queue) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1152 | { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1153 | int id, ref; |
| 1154 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1155 | spin_lock_bh(&queue->rx_lock); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1156 | |
| 1157 | for (id = 0; id < NET_RX_RING_SIZE; id++) { |
Annie Li | cefe007 | 2014-01-28 11:35:42 +0800 | [diff] [blame] | 1158 | struct sk_buff *skb; |
| 1159 | struct page *page; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1160 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1161 | skb = queue->rx_skbs[id]; |
Annie Li | cefe007 | 2014-01-28 11:35:42 +0800 | [diff] [blame] | 1162 | if (!skb) |
| 1163 | continue; |
| 1164 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1165 | ref = queue->grant_rx_ref[id]; |
Annie Li | cefe007 | 2014-01-28 11:35:42 +0800 | [diff] [blame] | 1166 | if (ref == GRANT_INVALID_REF) |
| 1167 | continue; |
| 1168 | |
| 1169 | page = skb_frag_page(&skb_shinfo(skb)->frags[0]); |
| 1170 | |
| 1171 | /* gnttab_end_foreign_access() needs a page ref until |
| 1172 | * foreign access is ended (which may be deferred). |
| 1173 | */ |
| 1174 | get_page(page); |
| 1175 | gnttab_end_foreign_access(ref, 0, |
| 1176 | (unsigned long)page_address(page)); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1177 | queue->grant_rx_ref[id] = GRANT_INVALID_REF; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1178 | |
Annie Li | cefe007 | 2014-01-28 11:35:42 +0800 | [diff] [blame] | 1179 | kfree_skb(skb); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1180 | } |
| 1181 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1182 | spin_unlock_bh(&queue->rx_lock); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1183 | } |
| 1184 | |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 1185 | static netdev_features_t xennet_fix_features(struct net_device *dev, |
| 1186 | netdev_features_t features) |
Eric Dumazet | 8f7b01a | 2011-04-03 17:21:00 -0700 | [diff] [blame] | 1187 | { |
| 1188 | struct netfront_info *np = netdev_priv(dev); |
Eric Dumazet | 8f7b01a | 2011-04-03 17:21:00 -0700 | [diff] [blame] | 1189 | |
Juergen Gross | 2890ea5 | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1190 | if (features & NETIF_F_SG && |
| 1191 | !xenbus_read_unsigned(np->xbdev->otherend, "feature-sg", 0)) |
| 1192 | features &= ~NETIF_F_SG; |
Eric Dumazet | 8f7b01a | 2011-04-03 17:21:00 -0700 | [diff] [blame] | 1193 | |
Juergen Gross | 2890ea5 | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1194 | if (features & NETIF_F_IPV6_CSUM && |
| 1195 | !xenbus_read_unsigned(np->xbdev->otherend, |
| 1196 | "feature-ipv6-csum-offload", 0)) |
| 1197 | features &= ~NETIF_F_IPV6_CSUM; |
Eric Dumazet | 8f7b01a | 2011-04-03 17:21:00 -0700 | [diff] [blame] | 1198 | |
Juergen Gross | 2890ea5 | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1199 | if (features & NETIF_F_TSO && |
| 1200 | !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv4", 0)) |
| 1201 | features &= ~NETIF_F_TSO; |
Paul Durrant | 2c0057d | 2014-01-15 17:30:33 +0000 | [diff] [blame] | 1202 | |
Juergen Gross | 2890ea5 | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1203 | if (features & NETIF_F_TSO6 && |
| 1204 | !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv6", 0)) |
| 1205 | features &= ~NETIF_F_TSO6; |
Paul Durrant | 2c0057d | 2014-01-15 17:30:33 +0000 | [diff] [blame] | 1206 | |
Eric Dumazet | 8f7b01a | 2011-04-03 17:21:00 -0700 | [diff] [blame] | 1207 | return features; |
| 1208 | } |
| 1209 | |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 1210 | static int xennet_set_features(struct net_device *dev, |
| 1211 | netdev_features_t features) |
Eric Dumazet | 8f7b01a | 2011-04-03 17:21:00 -0700 | [diff] [blame] | 1212 | { |
| 1213 | if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { |
| 1214 | netdev_info(dev, "Reducing MTU because no SG offload"); |
| 1215 | dev->mtu = ETH_DATA_LEN; |
| 1216 | } |
| 1217 | |
| 1218 | return 0; |
| 1219 | } |
| 1220 | |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1221 | static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 1222 | { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1223 | struct netfront_queue *queue = dev_id; |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 1224 | unsigned long flags; |
| 1225 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1226 | spin_lock_irqsave(&queue->tx_lock, flags); |
| 1227 | xennet_tx_buf_gc(queue); |
| 1228 | spin_unlock_irqrestore(&queue->tx_lock, flags); |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 1229 | |
| 1230 | return IRQ_HANDLED; |
| 1231 | } |
| 1232 | |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1233 | static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) |
| 1234 | { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1235 | struct netfront_queue *queue = dev_id; |
| 1236 | struct net_device *dev = queue->info->netdev; |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1237 | |
| 1238 | if (likely(netif_carrier_ok(dev) && |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1239 | RING_HAS_UNCONSUMED_RESPONSES(&queue->rx))) |
David Vrabel | 7654186 | 2014-06-18 10:47:27 +0100 | [diff] [blame] | 1240 | napi_schedule(&queue->napi); |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1241 | |
| 1242 | return IRQ_HANDLED; |
| 1243 | } |
| 1244 | |
| 1245 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) |
| 1246 | { |
| 1247 | xennet_tx_interrupt(irq, dev_id); |
| 1248 | xennet_rx_interrupt(irq, dev_id); |
| 1249 | return IRQ_HANDLED; |
| 1250 | } |
| 1251 | |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 1252 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 1253 | static void xennet_poll_controller(struct net_device *dev) |
| 1254 | { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1255 | /* Poll each queue */ |
| 1256 | struct netfront_info *info = netdev_priv(dev); |
| 1257 | unsigned int num_queues = dev->real_num_tx_queues; |
| 1258 | unsigned int i; |
| 1259 | for (i = 0; i < num_queues; ++i) |
| 1260 | xennet_interrupt(0, &info->queues[i]); |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 1261 | } |
| 1262 | #endif |
| 1263 | |
Stephen Hemminger | 0a0b9d2 | 2009-01-06 10:44:55 -0800 | [diff] [blame] | 1264 | static const struct net_device_ops xennet_netdev_ops = { |
| 1265 | .ndo_open = xennet_open, |
Stephen Hemminger | 0a0b9d2 | 2009-01-06 10:44:55 -0800 | [diff] [blame] | 1266 | .ndo_stop = xennet_close, |
| 1267 | .ndo_start_xmit = xennet_start_xmit, |
| 1268 | .ndo_change_mtu = xennet_change_mtu, |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1269 | .ndo_get_stats64 = xennet_get_stats64, |
Stephen Hemminger | 0a0b9d2 | 2009-01-06 10:44:55 -0800 | [diff] [blame] | 1270 | .ndo_set_mac_address = eth_mac_addr, |
| 1271 | .ndo_validate_addr = eth_validate_addr, |
Michał Mirosław | fb50793 | 2011-03-31 01:01:35 +0000 | [diff] [blame] | 1272 | .ndo_fix_features = xennet_fix_features, |
| 1273 | .ndo_set_features = xennet_set_features, |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1274 | .ndo_select_queue = xennet_select_queue, |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 1275 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 1276 | .ndo_poll_controller = xennet_poll_controller, |
| 1277 | #endif |
Stephen Hemminger | 0a0b9d2 | 2009-01-06 10:44:55 -0800 | [diff] [blame] | 1278 | }; |
| 1279 | |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 1280 | static void xennet_free_netdev(struct net_device *netdev) |
| 1281 | { |
| 1282 | struct netfront_info *np = netdev_priv(netdev); |
| 1283 | |
| 1284 | free_percpu(np->rx_stats); |
| 1285 | free_percpu(np->tx_stats); |
| 1286 | free_netdev(netdev); |
| 1287 | } |
| 1288 | |
Bill Pemberton | 8e0e46b | 2012-12-03 09:24:22 -0500 | [diff] [blame] | 1289 | static struct net_device *xennet_create_dev(struct xenbus_device *dev) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1290 | { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1291 | int err; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1292 | struct net_device *netdev; |
| 1293 | struct netfront_info *np; |
| 1294 | |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 1295 | netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues); |
Joe Perches | 41de8d4 | 2012-01-29 13:47:52 +0000 | [diff] [blame] | 1296 | if (!netdev) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1297 | return ERR_PTR(-ENOMEM); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1298 | |
| 1299 | np = netdev_priv(netdev); |
| 1300 | np->xbdev = dev; |
| 1301 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1302 | np->queues = NULL; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1303 | |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1304 | err = -ENOMEM; |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 1305 | np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); |
| 1306 | if (np->rx_stats == NULL) |
| 1307 | goto exit; |
| 1308 | np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); |
| 1309 | if (np->tx_stats == NULL) |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1310 | goto exit; |
| 1311 | |
Stephen Hemminger | 0a0b9d2 | 2009-01-06 10:44:55 -0800 | [diff] [blame] | 1312 | netdev->netdev_ops = &xennet_netdev_ops; |
| 1313 | |
Michał Mirosław | fb50793 | 2011-03-31 01:01:35 +0000 | [diff] [blame] | 1314 | netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | |
| 1315 | NETIF_F_GSO_ROBUST; |
Paul Durrant | 2c0057d | 2014-01-15 17:30:33 +0000 | [diff] [blame] | 1316 | netdev->hw_features = NETIF_F_SG | |
| 1317 | NETIF_F_IPV6_CSUM | |
| 1318 | NETIF_F_TSO | NETIF_F_TSO6; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1319 | |
Ian Campbell | fc3e594 | 2011-04-04 11:07:57 -0700 | [diff] [blame] | 1320 | /* |
| 1321 | * Assume that all hw features are available for now. This set |
| 1322 | * will be adjusted by the call to netdev_update_features() in |
| 1323 | * xennet_connect() which is the earliest point where we can |
| 1324 | * negotiate with the backend regarding supported features. |
| 1325 | */ |
| 1326 | netdev->features |= netdev->hw_features; |
| 1327 | |
Wilfried Klaebe | 7ad24ea | 2014-05-11 00:12:32 +0000 | [diff] [blame] | 1328 | netdev->ethtool_ops = &xennet_ethtool_ops; |
Mohammed Gamal | e1043a4 | 2017-10-16 15:20:32 +0200 | [diff] [blame] | 1329 | netdev->min_mtu = ETH_MIN_MTU; |
Jarod Wilson | d0c2c99 | 2016-10-20 13:55:21 -0400 | [diff] [blame] | 1330 | netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1331 | SET_NETDEV_DEV(netdev, &dev->dev); |
| 1332 | |
| 1333 | np->netdev = netdev; |
| 1334 | |
| 1335 | netif_carrier_off(netdev); |
| 1336 | |
Eduardo Otubo | b707fda | 2018-01-05 09:42:16 +0100 | [diff] [blame] | 1337 | xenbus_switch_state(dev, XenbusStateInitialising); |
Juergen Gross | 8edfe2e | 2018-09-07 14:21:30 +0200 | [diff] [blame] | 1338 | wait_event(module_wq, |
| 1339 | xenbus_read_driver_state(dev->otherend) != |
| 1340 | XenbusStateClosed && |
| 1341 | xenbus_read_driver_state(dev->otherend) != |
| 1342 | XenbusStateUnknown); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1343 | return netdev; |
| 1344 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1345 | exit: |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 1346 | xennet_free_netdev(netdev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1347 | return ERR_PTR(err); |
| 1348 | } |
| 1349 | |
| 1350 | /** |
| 1351 | * Entry point to this code when a new device is created. Allocate the basic |
| 1352 | * structures and the ring buffers for communication with the backend, and |
| 1353 | * inform the backend of the appropriate details for those. |
| 1354 | */ |
Bill Pemberton | 8e0e46b | 2012-12-03 09:24:22 -0500 | [diff] [blame] | 1355 | static int netfront_probe(struct xenbus_device *dev, |
Greg Kroah-Hartman | 1dd06ae | 2012-12-06 14:30:56 +0000 | [diff] [blame] | 1356 | const struct xenbus_device_id *id) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1357 | { |
| 1358 | int err; |
| 1359 | struct net_device *netdev; |
| 1360 | struct netfront_info *info; |
| 1361 | |
| 1362 | netdev = xennet_create_dev(dev); |
| 1363 | if (IS_ERR(netdev)) { |
| 1364 | err = PTR_ERR(netdev); |
| 1365 | xenbus_dev_fatal(dev, err, "creating netdev"); |
| 1366 | return err; |
| 1367 | } |
| 1368 | |
| 1369 | info = netdev_priv(netdev); |
Greg Kroah-Hartman | 1b713e0 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 1370 | dev_set_drvdata(&dev->dev, info); |
Takashi Iwai | 27b917e | 2015-02-04 14:38:55 +0100 | [diff] [blame] | 1371 | #ifdef CONFIG_SYSFS |
| 1372 | info->netdev->sysfs_groups[0] = &xennet_dev_group; |
| 1373 | #endif |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1374 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1375 | return 0; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1376 | } |
| 1377 | |
| 1378 | static void xennet_end_access(int ref, void *page) |
| 1379 | { |
| 1380 | /* This frees the page as a side-effect */ |
| 1381 | if (ref != GRANT_INVALID_REF) |
| 1382 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); |
| 1383 | } |
| 1384 | |
| 1385 | static void xennet_disconnect_backend(struct netfront_info *info) |
| 1386 | { |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1387 | unsigned int i = 0; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1388 | unsigned int num_queues = info->netdev->real_num_tx_queues; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1389 | |
David Vrabel | f9feb1e | 2014-07-02 16:09:15 +0100 | [diff] [blame] | 1390 | netif_carrier_off(info->netdev); |
| 1391 | |
Chas Williams | 9a873c7 | 2015-08-19 19:14:20 -0400 | [diff] [blame] | 1392 | for (i = 0; i < num_queues && info->queues; ++i) { |
David Vrabel | 7654186 | 2014-06-18 10:47:27 +0100 | [diff] [blame] | 1393 | struct netfront_queue *queue = &info->queues[i]; |
| 1394 | |
Boris Ostrovsky | 7447095 | 2017-01-30 12:45:46 -0500 | [diff] [blame] | 1395 | del_timer_sync(&queue->rx_refill_timer); |
| 1396 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1397 | if (queue->tx_irq && (queue->tx_irq == queue->rx_irq)) |
| 1398 | unbind_from_irqhandler(queue->tx_irq, queue); |
| 1399 | if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) { |
| 1400 | unbind_from_irqhandler(queue->tx_irq, queue); |
| 1401 | unbind_from_irqhandler(queue->rx_irq, queue); |
| 1402 | } |
| 1403 | queue->tx_evtchn = queue->rx_evtchn = 0; |
| 1404 | queue->tx_irq = queue->rx_irq = 0; |
| 1405 | |
Chas Williams | 274b045 | 2015-08-27 12:28:46 -0400 | [diff] [blame] | 1406 | if (netif_running(info->netdev)) |
| 1407 | napi_synchronize(&queue->napi); |
David Vrabel | f9feb1e | 2014-07-02 16:09:15 +0100 | [diff] [blame] | 1408 | |
David Vrabel | a5b5dc3 | 2014-07-31 17:38:23 +0100 | [diff] [blame] | 1409 | xennet_release_tx_bufs(queue); |
| 1410 | xennet_release_rx_bufs(queue); |
| 1411 | gnttab_free_grant_references(queue->gref_tx_head); |
| 1412 | gnttab_free_grant_references(queue->gref_rx_head); |
| 1413 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1414 | /* End access and free the pages */ |
| 1415 | xennet_end_access(queue->tx_ring_ref, queue->tx.sring); |
| 1416 | xennet_end_access(queue->rx_ring_ref, queue->rx.sring); |
| 1417 | |
| 1418 | queue->tx_ring_ref = GRANT_INVALID_REF; |
| 1419 | queue->rx_ring_ref = GRANT_INVALID_REF; |
| 1420 | queue->tx.sring = NULL; |
| 1421 | queue->rx.sring = NULL; |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1422 | } |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1423 | } |
| 1424 | |
| 1425 | /** |
| 1426 | * We are reconnecting to the backend, due to a suspend/resume, or a backend |
| 1427 | * driver restart. We tear down our netif structure and recreate it, but |
| 1428 | * leave the device-layer structures intact so that this is transparent to the |
| 1429 | * rest of the kernel. |
| 1430 | */ |
| 1431 | static int netfront_resume(struct xenbus_device *dev) |
| 1432 | { |
Greg Kroah-Hartman | 1b713e0 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 1433 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1434 | |
| 1435 | dev_dbg(&dev->dev, "%s\n", dev->nodename); |
| 1436 | |
| 1437 | xennet_disconnect_backend(info); |
| 1438 | return 0; |
| 1439 | } |
| 1440 | |
| 1441 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) |
| 1442 | { |
| 1443 | char *s, *e, *macstr; |
| 1444 | int i; |
| 1445 | |
| 1446 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); |
| 1447 | if (IS_ERR(macstr)) |
| 1448 | return PTR_ERR(macstr); |
| 1449 | |
| 1450 | for (i = 0; i < ETH_ALEN; i++) { |
| 1451 | mac[i] = simple_strtoul(s, &e, 16); |
| 1452 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { |
| 1453 | kfree(macstr); |
| 1454 | return -ENOENT; |
| 1455 | } |
| 1456 | s = e+1; |
| 1457 | } |
| 1458 | |
| 1459 | kfree(macstr); |
| 1460 | return 0; |
| 1461 | } |
| 1462 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1463 | static int setup_netfront_single(struct netfront_queue *queue) |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1464 | { |
| 1465 | int err; |
| 1466 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1467 | err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1468 | if (err < 0) |
| 1469 | goto fail; |
| 1470 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1471 | err = bind_evtchn_to_irqhandler(queue->tx_evtchn, |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1472 | xennet_interrupt, |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1473 | 0, queue->info->netdev->name, queue); |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1474 | if (err < 0) |
| 1475 | goto bind_fail; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1476 | queue->rx_evtchn = queue->tx_evtchn; |
| 1477 | queue->rx_irq = queue->tx_irq = err; |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1478 | |
| 1479 | return 0; |
| 1480 | |
| 1481 | bind_fail: |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1482 | xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); |
| 1483 | queue->tx_evtchn = 0; |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1484 | fail: |
| 1485 | return err; |
| 1486 | } |
| 1487 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1488 | static int setup_netfront_split(struct netfront_queue *queue) |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1489 | { |
| 1490 | int err; |
| 1491 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1492 | err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1493 | if (err < 0) |
| 1494 | goto fail; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1495 | err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn); |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1496 | if (err < 0) |
| 1497 | goto alloc_rx_evtchn_fail; |
| 1498 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1499 | snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), |
| 1500 | "%s-tx", queue->name); |
| 1501 | err = bind_evtchn_to_irqhandler(queue->tx_evtchn, |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1502 | xennet_tx_interrupt, |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1503 | 0, queue->tx_irq_name, queue); |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1504 | if (err < 0) |
| 1505 | goto bind_tx_fail; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1506 | queue->tx_irq = err; |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1507 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1508 | snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), |
| 1509 | "%s-rx", queue->name); |
| 1510 | err = bind_evtchn_to_irqhandler(queue->rx_evtchn, |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1511 | xennet_rx_interrupt, |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1512 | 0, queue->rx_irq_name, queue); |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1513 | if (err < 0) |
| 1514 | goto bind_rx_fail; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1515 | queue->rx_irq = err; |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1516 | |
| 1517 | return 0; |
| 1518 | |
| 1519 | bind_rx_fail: |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1520 | unbind_from_irqhandler(queue->tx_irq, queue); |
| 1521 | queue->tx_irq = 0; |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1522 | bind_tx_fail: |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1523 | xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn); |
| 1524 | queue->rx_evtchn = 0; |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1525 | alloc_rx_evtchn_fail: |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1526 | xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); |
| 1527 | queue->tx_evtchn = 0; |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1528 | fail: |
| 1529 | return err; |
| 1530 | } |
| 1531 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1532 | static int setup_netfront(struct xenbus_device *dev, |
| 1533 | struct netfront_queue *queue, unsigned int feature_split_evtchn) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1534 | { |
| 1535 | struct xen_netif_tx_sring *txs; |
| 1536 | struct xen_netif_rx_sring *rxs; |
Wei Liu | ccc9d90 | 2015-04-03 14:44:59 +0800 | [diff] [blame] | 1537 | grant_ref_t gref; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1538 | int err; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1539 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1540 | queue->tx_ring_ref = GRANT_INVALID_REF; |
| 1541 | queue->rx_ring_ref = GRANT_INVALID_REF; |
| 1542 | queue->rx.sring = NULL; |
| 1543 | queue->tx.sring = NULL; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1544 | |
Ian Campbell | a144ff0 | 2008-06-17 10:47:08 +0200 | [diff] [blame] | 1545 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1546 | if (!txs) { |
| 1547 | err = -ENOMEM; |
| 1548 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); |
| 1549 | goto fail; |
| 1550 | } |
| 1551 | SHARED_RING_INIT(txs); |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 1552 | FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1553 | |
Wei Liu | ccc9d90 | 2015-04-03 14:44:59 +0800 | [diff] [blame] | 1554 | err = xenbus_grant_ring(dev, txs, 1, &gref); |
Wei Liu | 1ca2983 | 2013-05-20 01:05:12 +0000 | [diff] [blame] | 1555 | if (err < 0) |
| 1556 | goto grant_tx_ring_fail; |
Wei Liu | ccc9d90 | 2015-04-03 14:44:59 +0800 | [diff] [blame] | 1557 | queue->tx_ring_ref = gref; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1558 | |
Ian Campbell | a144ff0 | 2008-06-17 10:47:08 +0200 | [diff] [blame] | 1559 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1560 | if (!rxs) { |
| 1561 | err = -ENOMEM; |
| 1562 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); |
Wei Liu | 1ca2983 | 2013-05-20 01:05:12 +0000 | [diff] [blame] | 1563 | goto alloc_rx_ring_fail; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1564 | } |
| 1565 | SHARED_RING_INIT(rxs); |
Julien Grall | 30c5d7f | 2015-04-10 14:42:21 +0100 | [diff] [blame] | 1566 | FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1567 | |
Wei Liu | ccc9d90 | 2015-04-03 14:44:59 +0800 | [diff] [blame] | 1568 | err = xenbus_grant_ring(dev, rxs, 1, &gref); |
Wei Liu | 1ca2983 | 2013-05-20 01:05:12 +0000 | [diff] [blame] | 1569 | if (err < 0) |
| 1570 | goto grant_rx_ring_fail; |
Wei Liu | ccc9d90 | 2015-04-03 14:44:59 +0800 | [diff] [blame] | 1571 | queue->rx_ring_ref = gref; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1572 | |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1573 | if (feature_split_evtchn) |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1574 | err = setup_netfront_split(queue); |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1575 | /* setup single event channel if |
| 1576 | * a) feature-split-event-channels == 0 |
| 1577 | * b) feature-split-event-channels == 1 but failed to setup |
| 1578 | */ |
| 1579 | if (!feature_split_evtchn || (feature_split_evtchn && err)) |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1580 | err = setup_netfront_single(queue); |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1581 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1582 | if (err) |
Wei Liu | 1ca2983 | 2013-05-20 01:05:12 +0000 | [diff] [blame] | 1583 | goto alloc_evtchn_fail; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1584 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1585 | return 0; |
| 1586 | |
Wei Liu | 1ca2983 | 2013-05-20 01:05:12 +0000 | [diff] [blame] | 1587 | /* If we fail to setup netfront, it is safe to just revoke access to |
| 1588 | * granted pages because backend is not accessing it at this point. |
| 1589 | */ |
Wei Liu | 1ca2983 | 2013-05-20 01:05:12 +0000 | [diff] [blame] | 1590 | alloc_evtchn_fail: |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1591 | gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0); |
Wei Liu | 1ca2983 | 2013-05-20 01:05:12 +0000 | [diff] [blame] | 1592 | grant_rx_ring_fail: |
| 1593 | free_page((unsigned long)rxs); |
| 1594 | alloc_rx_ring_fail: |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1595 | gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0); |
Wei Liu | 1ca2983 | 2013-05-20 01:05:12 +0000 | [diff] [blame] | 1596 | grant_tx_ring_fail: |
| 1597 | free_page((unsigned long)txs); |
| 1598 | fail: |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1599 | return err; |
| 1600 | } |
| 1601 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1602 | /* Queue-specific initialisation |
| 1603 | * This used to be done in xennet_create_dev() but must now |
| 1604 | * be run per-queue. |
| 1605 | */ |
| 1606 | static int xennet_init_queue(struct netfront_queue *queue) |
| 1607 | { |
| 1608 | unsigned short i; |
| 1609 | int err = 0; |
Xiao Liang | 21f2706 | 2018-08-14 23:21:28 +0800 | [diff] [blame] | 1610 | char *devid; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1611 | |
| 1612 | spin_lock_init(&queue->tx_lock); |
| 1613 | spin_lock_init(&queue->rx_lock); |
| 1614 | |
Kees Cook | e99e88a | 2017-10-16 14:43:17 -0700 | [diff] [blame] | 1615 | timer_setup(&queue->rx_refill_timer, rx_refill_timeout, 0); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1616 | |
Xiao Liang | 21f2706 | 2018-08-14 23:21:28 +0800 | [diff] [blame] | 1617 | devid = strrchr(queue->info->xbdev->nodename, '/') + 1; |
| 1618 | snprintf(queue->name, sizeof(queue->name), "vif%s-q%u", |
| 1619 | devid, queue->id); |
Wei Liu | 8b71501 | 2014-06-04 10:30:47 +0100 | [diff] [blame] | 1620 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1621 | /* Initialise tx_skbs as a free chain containing every entry. */ |
| 1622 | queue->tx_skb_freelist = 0; |
| 1623 | for (i = 0; i < NET_TX_RING_SIZE; i++) { |
| 1624 | skb_entry_set_link(&queue->tx_skbs[i], i+1); |
| 1625 | queue->grant_tx_ref[i] = GRANT_INVALID_REF; |
| 1626 | queue->grant_tx_page[i] = NULL; |
| 1627 | } |
| 1628 | |
| 1629 | /* Clear out rx_skbs */ |
| 1630 | for (i = 0; i < NET_RX_RING_SIZE; i++) { |
| 1631 | queue->rx_skbs[i] = NULL; |
| 1632 | queue->grant_rx_ref[i] = GRANT_INVALID_REF; |
| 1633 | } |
| 1634 | |
| 1635 | /* A grant for every tx ring slot */ |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 1636 | if (gnttab_alloc_grant_references(NET_TX_RING_SIZE, |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1637 | &queue->gref_tx_head) < 0) { |
| 1638 | pr_alert("can't alloc tx grant refs\n"); |
| 1639 | err = -ENOMEM; |
| 1640 | goto exit; |
| 1641 | } |
| 1642 | |
| 1643 | /* A grant for every rx ring slot */ |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 1644 | if (gnttab_alloc_grant_references(NET_RX_RING_SIZE, |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1645 | &queue->gref_rx_head) < 0) { |
| 1646 | pr_alert("can't alloc rx grant refs\n"); |
| 1647 | err = -ENOMEM; |
| 1648 | goto exit_free_tx; |
| 1649 | } |
| 1650 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1651 | return 0; |
| 1652 | |
| 1653 | exit_free_tx: |
| 1654 | gnttab_free_grant_references(queue->gref_tx_head); |
| 1655 | exit: |
| 1656 | return err; |
| 1657 | } |
| 1658 | |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 1659 | static int write_queue_xenstore_keys(struct netfront_queue *queue, |
| 1660 | struct xenbus_transaction *xbt, int write_hierarchical) |
| 1661 | { |
| 1662 | /* Write the queue-specific keys into XenStore in the traditional |
| 1663 | * way for a single queue, or in a queue subkeys for multiple |
| 1664 | * queues. |
| 1665 | */ |
| 1666 | struct xenbus_device *dev = queue->info->xbdev; |
| 1667 | int err; |
| 1668 | const char *message; |
| 1669 | char *path; |
| 1670 | size_t pathsize; |
| 1671 | |
| 1672 | /* Choose the correct place to write the keys */ |
| 1673 | if (write_hierarchical) { |
| 1674 | pathsize = strlen(dev->nodename) + 10; |
| 1675 | path = kzalloc(pathsize, GFP_KERNEL); |
| 1676 | if (!path) { |
| 1677 | err = -ENOMEM; |
| 1678 | message = "out of memory while writing ring references"; |
| 1679 | goto error; |
| 1680 | } |
| 1681 | snprintf(path, pathsize, "%s/queue-%u", |
| 1682 | dev->nodename, queue->id); |
| 1683 | } else { |
| 1684 | path = (char *)dev->nodename; |
| 1685 | } |
| 1686 | |
| 1687 | /* Write ring references */ |
| 1688 | err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u", |
| 1689 | queue->tx_ring_ref); |
| 1690 | if (err) { |
| 1691 | message = "writing tx-ring-ref"; |
| 1692 | goto error; |
| 1693 | } |
| 1694 | |
| 1695 | err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u", |
| 1696 | queue->rx_ring_ref); |
| 1697 | if (err) { |
| 1698 | message = "writing rx-ring-ref"; |
| 1699 | goto error; |
| 1700 | } |
| 1701 | |
| 1702 | /* Write event channels; taking into account both shared |
| 1703 | * and split event channel scenarios. |
| 1704 | */ |
| 1705 | if (queue->tx_evtchn == queue->rx_evtchn) { |
| 1706 | /* Shared event channel */ |
| 1707 | err = xenbus_printf(*xbt, path, |
| 1708 | "event-channel", "%u", queue->tx_evtchn); |
| 1709 | if (err) { |
| 1710 | message = "writing event-channel"; |
| 1711 | goto error; |
| 1712 | } |
| 1713 | } else { |
| 1714 | /* Split event channels */ |
| 1715 | err = xenbus_printf(*xbt, path, |
| 1716 | "event-channel-tx", "%u", queue->tx_evtchn); |
| 1717 | if (err) { |
| 1718 | message = "writing event-channel-tx"; |
| 1719 | goto error; |
| 1720 | } |
| 1721 | |
| 1722 | err = xenbus_printf(*xbt, path, |
| 1723 | "event-channel-rx", "%u", queue->rx_evtchn); |
| 1724 | if (err) { |
| 1725 | message = "writing event-channel-rx"; |
| 1726 | goto error; |
| 1727 | } |
| 1728 | } |
| 1729 | |
| 1730 | if (write_hierarchical) |
| 1731 | kfree(path); |
| 1732 | return 0; |
| 1733 | |
| 1734 | error: |
| 1735 | if (write_hierarchical) |
| 1736 | kfree(path); |
| 1737 | xenbus_dev_fatal(dev, err, "%s", message); |
| 1738 | return err; |
| 1739 | } |
| 1740 | |
David Vrabel | ce58725 | 2014-06-18 10:47:28 +0100 | [diff] [blame] | 1741 | static void xennet_destroy_queues(struct netfront_info *info) |
| 1742 | { |
| 1743 | unsigned int i; |
| 1744 | |
David Vrabel | ce58725 | 2014-06-18 10:47:28 +0100 | [diff] [blame] | 1745 | for (i = 0; i < info->netdev->real_num_tx_queues; i++) { |
| 1746 | struct netfront_queue *queue = &info->queues[i]; |
| 1747 | |
| 1748 | if (netif_running(info->netdev)) |
| 1749 | napi_disable(&queue->napi); |
| 1750 | netif_napi_del(&queue->napi); |
| 1751 | } |
| 1752 | |
David Vrabel | ce58725 | 2014-06-18 10:47:28 +0100 | [diff] [blame] | 1753 | kfree(info->queues); |
| 1754 | info->queues = NULL; |
| 1755 | } |
| 1756 | |
| 1757 | static int xennet_create_queues(struct netfront_info *info, |
Joe Jin | ca88ea1 | 2015-10-19 13:37:17 +0800 | [diff] [blame] | 1758 | unsigned int *num_queues) |
David Vrabel | ce58725 | 2014-06-18 10:47:28 +0100 | [diff] [blame] | 1759 | { |
| 1760 | unsigned int i; |
| 1761 | int ret; |
| 1762 | |
Joe Jin | ca88ea1 | 2015-10-19 13:37:17 +0800 | [diff] [blame] | 1763 | info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue), |
David Vrabel | ce58725 | 2014-06-18 10:47:28 +0100 | [diff] [blame] | 1764 | GFP_KERNEL); |
| 1765 | if (!info->queues) |
| 1766 | return -ENOMEM; |
| 1767 | |
Joe Jin | ca88ea1 | 2015-10-19 13:37:17 +0800 | [diff] [blame] | 1768 | for (i = 0; i < *num_queues; i++) { |
David Vrabel | ce58725 | 2014-06-18 10:47:28 +0100 | [diff] [blame] | 1769 | struct netfront_queue *queue = &info->queues[i]; |
| 1770 | |
| 1771 | queue->id = i; |
| 1772 | queue->info = info; |
| 1773 | |
| 1774 | ret = xennet_init_queue(queue); |
| 1775 | if (ret < 0) { |
Ross Lagerwall | f599c64 | 2018-01-11 09:36:38 +0000 | [diff] [blame] | 1776 | dev_warn(&info->xbdev->dev, |
David Vrabel | 69cb852 | 2014-07-31 17:38:24 +0100 | [diff] [blame] | 1777 | "only created %d queues\n", i); |
Joe Jin | ca88ea1 | 2015-10-19 13:37:17 +0800 | [diff] [blame] | 1778 | *num_queues = i; |
David Vrabel | ce58725 | 2014-06-18 10:47:28 +0100 | [diff] [blame] | 1779 | break; |
| 1780 | } |
| 1781 | |
| 1782 | netif_napi_add(queue->info->netdev, &queue->napi, |
| 1783 | xennet_poll, 64); |
| 1784 | if (netif_running(info->netdev)) |
| 1785 | napi_enable(&queue->napi); |
| 1786 | } |
| 1787 | |
Joe Jin | ca88ea1 | 2015-10-19 13:37:17 +0800 | [diff] [blame] | 1788 | netif_set_real_num_tx_queues(info->netdev, *num_queues); |
David Vrabel | ce58725 | 2014-06-18 10:47:28 +0100 | [diff] [blame] | 1789 | |
Joe Jin | ca88ea1 | 2015-10-19 13:37:17 +0800 | [diff] [blame] | 1790 | if (*num_queues == 0) { |
Ross Lagerwall | f599c64 | 2018-01-11 09:36:38 +0000 | [diff] [blame] | 1791 | dev_err(&info->xbdev->dev, "no queues\n"); |
David Vrabel | ce58725 | 2014-06-18 10:47:28 +0100 | [diff] [blame] | 1792 | return -EINVAL; |
| 1793 | } |
| 1794 | return 0; |
| 1795 | } |
| 1796 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1797 | /* Common code used when first setting up, and when resuming. */ |
Ian Campbell | f502bf2 | 2010-08-18 23:27:49 +0000 | [diff] [blame] | 1798 | static int talk_to_netback(struct xenbus_device *dev, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1799 | struct netfront_info *info) |
| 1800 | { |
| 1801 | const char *message; |
| 1802 | struct xenbus_transaction xbt; |
| 1803 | int err; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1804 | unsigned int feature_split_evtchn; |
| 1805 | unsigned int i = 0; |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 1806 | unsigned int max_queues = 0; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1807 | struct netfront_queue *queue = NULL; |
| 1808 | unsigned int num_queues = 1; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1809 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1810 | info->netdev->irq = 0; |
| 1811 | |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 1812 | /* Check if backend supports multiple queues */ |
Juergen Gross | 2890ea5 | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1813 | max_queues = xenbus_read_unsigned(info->xbdev->otherend, |
| 1814 | "multi-queue-max-queues", 1); |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 1815 | num_queues = min(max_queues, xennet_max_queues); |
| 1816 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1817 | /* Check feature-split-event-channels */ |
Juergen Gross | 2890ea5 | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1818 | feature_split_evtchn = xenbus_read_unsigned(info->xbdev->otherend, |
| 1819 | "feature-split-event-channels", 0); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1820 | |
| 1821 | /* Read mac addr. */ |
| 1822 | err = xen_net_read_mac(dev, info->netdev->dev_addr); |
| 1823 | if (err) { |
| 1824 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); |
Ross Lagerwall | cb25778 | 2018-06-21 14:00:20 +0100 | [diff] [blame] | 1825 | goto out_unlocked; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1826 | } |
| 1827 | |
Ross Lagerwall | f599c64 | 2018-01-11 09:36:38 +0000 | [diff] [blame] | 1828 | rtnl_lock(); |
David Vrabel | ce58725 | 2014-06-18 10:47:28 +0100 | [diff] [blame] | 1829 | if (info->queues) |
| 1830 | xennet_destroy_queues(info); |
| 1831 | |
Joe Jin | ca88ea1 | 2015-10-19 13:37:17 +0800 | [diff] [blame] | 1832 | err = xennet_create_queues(info, &num_queues); |
Ross Lagerwall | e2e004a | 2017-02-08 10:57:37 +0000 | [diff] [blame] | 1833 | if (err < 0) { |
| 1834 | xenbus_dev_fatal(dev, err, "creating queues"); |
| 1835 | kfree(info->queues); |
| 1836 | info->queues = NULL; |
| 1837 | goto out; |
| 1838 | } |
Ross Lagerwall | f599c64 | 2018-01-11 09:36:38 +0000 | [diff] [blame] | 1839 | rtnl_unlock(); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1840 | |
| 1841 | /* Create shared ring, alloc event channel -- for each queue */ |
| 1842 | for (i = 0; i < num_queues; ++i) { |
| 1843 | queue = &info->queues[i]; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1844 | err = setup_netfront(dev, queue, feature_split_evtchn); |
Ross Lagerwall | e2e004a | 2017-02-08 10:57:37 +0000 | [diff] [blame] | 1845 | if (err) |
| 1846 | goto destroy_ring; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1847 | } |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1848 | |
| 1849 | again: |
| 1850 | err = xenbus_transaction_start(&xbt); |
| 1851 | if (err) { |
| 1852 | xenbus_dev_fatal(dev, err, "starting transaction"); |
| 1853 | goto destroy_ring; |
| 1854 | } |
| 1855 | |
chas williams | 812494d | 2015-09-16 16:28:25 -0400 | [diff] [blame] | 1856 | if (xenbus_exists(XBT_NIL, |
| 1857 | info->xbdev->otherend, "multi-queue-max-queues")) { |
| 1858 | /* Write the number of queues */ |
| 1859 | err = xenbus_printf(xbt, dev->nodename, |
| 1860 | "multi-queue-num-queues", "%u", num_queues); |
| 1861 | if (err) { |
| 1862 | message = "writing multi-queue-num-queues"; |
| 1863 | goto abort_transaction_no_dev_fatal; |
| 1864 | } |
| 1865 | } |
| 1866 | |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 1867 | if (num_queues == 1) { |
| 1868 | err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */ |
| 1869 | if (err) |
| 1870 | goto abort_transaction_no_dev_fatal; |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1871 | } else { |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 1872 | /* Write the keys for each queue */ |
| 1873 | for (i = 0; i < num_queues; ++i) { |
| 1874 | queue = &info->queues[i]; |
| 1875 | err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */ |
| 1876 | if (err) |
| 1877 | goto abort_transaction_no_dev_fatal; |
Wei Liu | d634bf2 | 2013-05-22 06:34:46 +0000 | [diff] [blame] | 1878 | } |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1879 | } |
| 1880 | |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 1881 | /* The remaining keys are not queue-specific */ |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1882 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", |
| 1883 | 1); |
| 1884 | if (err) { |
| 1885 | message = "writing request-rx-copy"; |
| 1886 | goto abort_transaction; |
| 1887 | } |
| 1888 | |
| 1889 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); |
| 1890 | if (err) { |
| 1891 | message = "writing feature-rx-notify"; |
| 1892 | goto abort_transaction; |
| 1893 | } |
| 1894 | |
| 1895 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); |
| 1896 | if (err) { |
| 1897 | message = "writing feature-sg"; |
| 1898 | goto abort_transaction; |
| 1899 | } |
| 1900 | |
| 1901 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); |
| 1902 | if (err) { |
| 1903 | message = "writing feature-gso-tcpv4"; |
| 1904 | goto abort_transaction; |
| 1905 | } |
| 1906 | |
Paul Durrant | 2c0057d | 2014-01-15 17:30:33 +0000 | [diff] [blame] | 1907 | err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1"); |
| 1908 | if (err) { |
| 1909 | message = "writing feature-gso-tcpv6"; |
| 1910 | goto abort_transaction; |
| 1911 | } |
| 1912 | |
| 1913 | err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload", |
| 1914 | "1"); |
| 1915 | if (err) { |
| 1916 | message = "writing feature-ipv6-csum-offload"; |
| 1917 | goto abort_transaction; |
| 1918 | } |
| 1919 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1920 | err = xenbus_transaction_end(xbt, 0); |
| 1921 | if (err) { |
| 1922 | if (err == -EAGAIN) |
| 1923 | goto again; |
| 1924 | xenbus_dev_fatal(dev, err, "completing transaction"); |
| 1925 | goto destroy_ring; |
| 1926 | } |
| 1927 | |
| 1928 | return 0; |
| 1929 | |
| 1930 | abort_transaction: |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1931 | xenbus_dev_fatal(dev, err, "%s", message); |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 1932 | abort_transaction_no_dev_fatal: |
| 1933 | xenbus_transaction_end(xbt, 1); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1934 | destroy_ring: |
| 1935 | xennet_disconnect_backend(info); |
Ross Lagerwall | f599c64 | 2018-01-11 09:36:38 +0000 | [diff] [blame] | 1936 | rtnl_lock(); |
Ross Lagerwall | e2e004a | 2017-02-08 10:57:37 +0000 | [diff] [blame] | 1937 | xennet_destroy_queues(info); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1938 | out: |
Ross Lagerwall | f599c64 | 2018-01-11 09:36:38 +0000 | [diff] [blame] | 1939 | rtnl_unlock(); |
Ross Lagerwall | cb25778 | 2018-06-21 14:00:20 +0100 | [diff] [blame] | 1940 | out_unlocked: |
Vitaly Kuznetsov | d86b567 | 2017-05-11 13:58:06 +0200 | [diff] [blame] | 1941 | device_unregister(&dev->dev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1942 | return err; |
| 1943 | } |
| 1944 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1945 | static int xennet_connect(struct net_device *dev) |
| 1946 | { |
| 1947 | struct netfront_info *np = netdev_priv(dev); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1948 | unsigned int num_queues = 0; |
David Vrabel | a5b5dc3 | 2014-07-31 17:38:23 +0100 | [diff] [blame] | 1949 | int err; |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1950 | unsigned int j = 0; |
| 1951 | struct netfront_queue *queue = NULL; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1952 | |
Juergen Gross | 2890ea5 | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1953 | if (!xenbus_read_unsigned(np->xbdev->otherend, "feature-rx-copy", 0)) { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1954 | dev_info(&dev->dev, |
Joe Perches | 898eb71 | 2007-10-18 03:06:30 -0700 | [diff] [blame] | 1955 | "backend does not support copying receive path\n"); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1956 | return -ENODEV; |
| 1957 | } |
| 1958 | |
Ian Campbell | f502bf2 | 2010-08-18 23:27:49 +0000 | [diff] [blame] | 1959 | err = talk_to_netback(np->xbdev, np); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1960 | if (err) |
| 1961 | return err; |
| 1962 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1963 | /* talk_to_netback() sets the correct number of queues */ |
| 1964 | num_queues = dev->real_num_tx_queues; |
| 1965 | |
Ross Lagerwall | f599c64 | 2018-01-11 09:36:38 +0000 | [diff] [blame] | 1966 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
| 1967 | err = register_netdev(dev); |
| 1968 | if (err) { |
| 1969 | pr_warn("%s: register_netdev err=%d\n", __func__, err); |
| 1970 | device_unregister(&np->xbdev->dev); |
| 1971 | return err; |
| 1972 | } |
| 1973 | } |
| 1974 | |
Ross Lagerwall | 45c8184 | 2018-06-21 14:00:21 +0100 | [diff] [blame] | 1975 | rtnl_lock(); |
| 1976 | netdev_update_features(dev); |
| 1977 | rtnl_unlock(); |
| 1978 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1979 | /* |
David Vrabel | a5b5dc3 | 2014-07-31 17:38:23 +0100 | [diff] [blame] | 1980 | * All public and private state should now be sane. Get |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1981 | * ready to start sending and receiving packets and give the driver |
| 1982 | * domain a kick because we've probably just requeued some |
| 1983 | * packets. |
| 1984 | */ |
| 1985 | netif_carrier_on(np->netdev); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1986 | for (j = 0; j < num_queues; ++j) { |
| 1987 | queue = &np->queues[j]; |
David Vrabel | f50b407 | 2014-07-02 16:09:14 +0100 | [diff] [blame] | 1988 | |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1989 | notify_remote_via_irq(queue->tx_irq); |
| 1990 | if (queue->tx_irq != queue->rx_irq) |
| 1991 | notify_remote_via_irq(queue->rx_irq); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1992 | |
David Vrabel | f50b407 | 2014-07-02 16:09:14 +0100 | [diff] [blame] | 1993 | spin_lock_irq(&queue->tx_lock); |
| 1994 | xennet_tx_buf_gc(queue); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1995 | spin_unlock_irq(&queue->tx_lock); |
David Vrabel | f50b407 | 2014-07-02 16:09:14 +0100 | [diff] [blame] | 1996 | |
| 1997 | spin_lock_bh(&queue->rx_lock); |
| 1998 | xennet_alloc_rx_buffers(queue); |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 1999 | spin_unlock_bh(&queue->rx_lock); |
| 2000 | } |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2001 | |
| 2002 | return 0; |
| 2003 | } |
| 2004 | |
| 2005 | /** |
| 2006 | * Callback received when the backend's state changes. |
| 2007 | */ |
Ian Campbell | f502bf2 | 2010-08-18 23:27:49 +0000 | [diff] [blame] | 2008 | static void netback_changed(struct xenbus_device *dev, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2009 | enum xenbus_state backend_state) |
| 2010 | { |
Greg Kroah-Hartman | 1b713e0 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 2011 | struct netfront_info *np = dev_get_drvdata(&dev->dev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2012 | struct net_device *netdev = np->netdev; |
| 2013 | |
| 2014 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); |
| 2015 | |
Juergen Gross | 8edfe2e | 2018-09-07 14:21:30 +0200 | [diff] [blame] | 2016 | wake_up_all(&module_wq); |
| 2017 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2018 | switch (backend_state) { |
| 2019 | case XenbusStateInitialising: |
| 2020 | case XenbusStateInitialised: |
Noboru Iwamatsu | b78c951 | 2009-10-13 17:22:29 -0400 | [diff] [blame] | 2021 | case XenbusStateReconfiguring: |
| 2022 | case XenbusStateReconfigured: |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2023 | case XenbusStateUnknown: |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2024 | break; |
| 2025 | |
| 2026 | case XenbusStateInitWait: |
| 2027 | if (dev->state != XenbusStateInitialising) |
| 2028 | break; |
| 2029 | if (xennet_connect(netdev) != 0) |
| 2030 | break; |
| 2031 | xenbus_switch_state(dev, XenbusStateConnected); |
Laszlo Ersek | 08e34eb | 2011-12-11 01:48:59 +0000 | [diff] [blame] | 2032 | break; |
| 2033 | |
| 2034 | case XenbusStateConnected: |
Amerigo Wang | ee89bab | 2012-08-09 22:14:56 +0000 | [diff] [blame] | 2035 | netdev_notify_peers(netdev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2036 | break; |
| 2037 | |
David Vrabel | bce3ea8 | 2014-02-04 18:50:26 +0000 | [diff] [blame] | 2038 | case XenbusStateClosed: |
| 2039 | if (dev->state == XenbusStateClosed) |
| 2040 | break; |
Gustavo A. R. Silva | a32b9d9 | 2019-04-15 16:11:41 -0500 | [diff] [blame] | 2041 | /* Fall through - Missed the backend's CLOSING state. */ |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2042 | case XenbusStateClosing: |
| 2043 | xenbus_frontend_closed(dev); |
| 2044 | break; |
| 2045 | } |
| 2046 | } |
| 2047 | |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 2048 | static const struct xennet_stat { |
| 2049 | char name[ETH_GSTRING_LEN]; |
| 2050 | u16 offset; |
| 2051 | } xennet_stats[] = { |
| 2052 | { |
| 2053 | "rx_gso_checksum_fixup", |
| 2054 | offsetof(struct netfront_info, rx_gso_checksum_fixup) |
| 2055 | }, |
| 2056 | }; |
| 2057 | |
| 2058 | static int xennet_get_sset_count(struct net_device *dev, int string_set) |
| 2059 | { |
| 2060 | switch (string_set) { |
| 2061 | case ETH_SS_STATS: |
| 2062 | return ARRAY_SIZE(xennet_stats); |
| 2063 | default: |
| 2064 | return -EINVAL; |
| 2065 | } |
| 2066 | } |
| 2067 | |
| 2068 | static void xennet_get_ethtool_stats(struct net_device *dev, |
| 2069 | struct ethtool_stats *stats, u64 * data) |
| 2070 | { |
| 2071 | void *np = netdev_priv(dev); |
| 2072 | int i; |
| 2073 | |
| 2074 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) |
Andrew J. Bennieston | 2688fcb | 2014-06-04 10:30:44 +0100 | [diff] [blame] | 2075 | data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset)); |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 2076 | } |
| 2077 | |
| 2078 | static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) |
| 2079 | { |
| 2080 | int i; |
| 2081 | |
| 2082 | switch (stringset) { |
| 2083 | case ETH_SS_STATS: |
| 2084 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) |
| 2085 | memcpy(data + i * ETH_GSTRING_LEN, |
| 2086 | xennet_stats[i].name, ETH_GSTRING_LEN); |
| 2087 | break; |
| 2088 | } |
| 2089 | } |
| 2090 | |
Stephen Hemminger | 0fc0b73 | 2009-09-02 01:03:33 -0700 | [diff] [blame] | 2091 | static const struct ethtool_ops xennet_ethtool_ops = |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2092 | { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2093 | .get_link = ethtool_op_get_link, |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 2094 | |
| 2095 | .get_sset_count = xennet_get_sset_count, |
| 2096 | .get_ethtool_stats = xennet_get_ethtool_stats, |
| 2097 | .get_strings = xennet_get_strings, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2098 | }; |
| 2099 | |
| 2100 | #ifdef CONFIG_SYSFS |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 2101 | static ssize_t show_rxbuf(struct device *dev, |
| 2102 | struct device_attribute *attr, char *buf) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2103 | { |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 2104 | return sprintf(buf, "%lu\n", NET_RX_RING_SIZE); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2105 | } |
| 2106 | |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 2107 | static ssize_t store_rxbuf(struct device *dev, |
| 2108 | struct device_attribute *attr, |
| 2109 | const char *buf, size_t len) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2110 | { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2111 | char *endp; |
| 2112 | unsigned long target; |
| 2113 | |
| 2114 | if (!capable(CAP_NET_ADMIN)) |
| 2115 | return -EPERM; |
| 2116 | |
| 2117 | target = simple_strtoul(buf, &endp, 0); |
| 2118 | if (endp == buf) |
| 2119 | return -EBADMSG; |
| 2120 | |
David Vrabel | 1f3c2eb | 2014-10-22 11:17:06 +0100 | [diff] [blame] | 2121 | /* rxbuf_min and rxbuf_max are no longer configurable. */ |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2122 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2123 | return len; |
| 2124 | } |
| 2125 | |
Joe Perches | d61e403 | 2018-03-23 15:54:39 -0700 | [diff] [blame] | 2126 | static DEVICE_ATTR(rxbuf_min, 0644, show_rxbuf, store_rxbuf); |
| 2127 | static DEVICE_ATTR(rxbuf_max, 0644, show_rxbuf, store_rxbuf); |
| 2128 | static DEVICE_ATTR(rxbuf_cur, 0444, show_rxbuf, NULL); |
Takashi Iwai | 27b917e | 2015-02-04 14:38:55 +0100 | [diff] [blame] | 2129 | |
| 2130 | static struct attribute *xennet_dev_attrs[] = { |
| 2131 | &dev_attr_rxbuf_min.attr, |
| 2132 | &dev_attr_rxbuf_max.attr, |
| 2133 | &dev_attr_rxbuf_cur.attr, |
| 2134 | NULL |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2135 | }; |
| 2136 | |
Takashi Iwai | 27b917e | 2015-02-04 14:38:55 +0100 | [diff] [blame] | 2137 | static const struct attribute_group xennet_dev_group = { |
| 2138 | .attrs = xennet_dev_attrs |
| 2139 | }; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2140 | #endif /* CONFIG_SYSFS */ |
| 2141 | |
Bill Pemberton | 8e0e46b | 2012-12-03 09:24:22 -0500 | [diff] [blame] | 2142 | static int xennet_remove(struct xenbus_device *dev) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2143 | { |
Greg Kroah-Hartman | 1b713e0 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 2144 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2145 | |
| 2146 | dev_dbg(&dev->dev, "%s\n", dev->nodename); |
| 2147 | |
Eduardo Otubo | 5b5971d | 2017-11-23 15:18:35 +0100 | [diff] [blame] | 2148 | if (xenbus_read_driver_state(dev->otherend) != XenbusStateClosed) { |
| 2149 | xenbus_switch_state(dev, XenbusStateClosing); |
Juergen Gross | 8edfe2e | 2018-09-07 14:21:30 +0200 | [diff] [blame] | 2150 | wait_event(module_wq, |
Eduardo Otubo | 5b5971d | 2017-11-23 15:18:35 +0100 | [diff] [blame] | 2151 | xenbus_read_driver_state(dev->otherend) == |
Jason Andryuk | c2d2e67 | 2018-02-28 07:23:23 -0500 | [diff] [blame] | 2152 | XenbusStateClosing || |
| 2153 | xenbus_read_driver_state(dev->otherend) == |
| 2154 | XenbusStateUnknown); |
Eduardo Otubo | 5b5971d | 2017-11-23 15:18:35 +0100 | [diff] [blame] | 2155 | |
| 2156 | xenbus_switch_state(dev, XenbusStateClosed); |
Juergen Gross | 8edfe2e | 2018-09-07 14:21:30 +0200 | [diff] [blame] | 2157 | wait_event(module_wq, |
Eduardo Otubo | 5b5971d | 2017-11-23 15:18:35 +0100 | [diff] [blame] | 2158 | xenbus_read_driver_state(dev->otherend) == |
| 2159 | XenbusStateClosed || |
| 2160 | xenbus_read_driver_state(dev->otherend) == |
| 2161 | XenbusStateUnknown); |
| 2162 | } |
| 2163 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2164 | xennet_disconnect_backend(info); |
| 2165 | |
Ross Lagerwall | f599c64 | 2018-01-11 09:36:38 +0000 | [diff] [blame] | 2166 | if (info->netdev->reg_state == NETREG_REGISTERED) |
| 2167 | unregister_netdev(info->netdev); |
Ian Campbell | 6bc96d0 | 2012-06-25 22:48:41 +0000 | [diff] [blame] | 2168 | |
Ross Lagerwall | f599c64 | 2018-01-11 09:36:38 +0000 | [diff] [blame] | 2169 | if (info->queues) { |
| 2170 | rtnl_lock(); |
Chas Williams | 9a873c7 | 2015-08-19 19:14:20 -0400 | [diff] [blame] | 2171 | xennet_destroy_queues(info); |
Ross Lagerwall | f599c64 | 2018-01-11 09:36:38 +0000 | [diff] [blame] | 2172 | rtnl_unlock(); |
| 2173 | } |
David Vrabel | 900e183 | 2015-01-13 16:42:42 +0000 | [diff] [blame] | 2174 | xennet_free_netdev(info->netdev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2175 | |
| 2176 | return 0; |
| 2177 | } |
| 2178 | |
David Vrabel | 95afae4 | 2014-09-08 17:30:41 +0100 | [diff] [blame] | 2179 | static const struct xenbus_device_id netfront_ids[] = { |
| 2180 | { "vif" }, |
| 2181 | { "" } |
| 2182 | }; |
| 2183 | |
| 2184 | static struct xenbus_driver netfront_driver = { |
| 2185 | .ids = netfront_ids, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2186 | .probe = netfront_probe, |
Bill Pemberton | 8e0e46b | 2012-12-03 09:24:22 -0500 | [diff] [blame] | 2187 | .remove = xennet_remove, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2188 | .resume = netfront_resume, |
Ian Campbell | f502bf2 | 2010-08-18 23:27:49 +0000 | [diff] [blame] | 2189 | .otherend_changed = netback_changed, |
David Vrabel | 95afae4 | 2014-09-08 17:30:41 +0100 | [diff] [blame] | 2190 | }; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2191 | |
| 2192 | static int __init netif_init(void) |
| 2193 | { |
Jeremy Fitzhardinge | 6e83358 | 2008-08-19 13:16:17 -0700 | [diff] [blame] | 2194 | if (!xen_domain()) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2195 | return -ENODEV; |
| 2196 | |
Konrad Rzeszutek Wilk | 51c71a3 | 2013-11-26 15:05:40 -0500 | [diff] [blame] | 2197 | if (!xen_has_pv_nic_devices()) |
Igor Mammedov | b9136d2 | 2012-03-21 15:08:38 +0100 | [diff] [blame] | 2198 | return -ENODEV; |
| 2199 | |
Joe Perches | 383eda3 | 2013-06-27 21:57:49 -0700 | [diff] [blame] | 2200 | pr_info("Initialising Xen virtual ethernet driver\n"); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2201 | |
Juergen Gross | 034702a | 2017-01-10 14:32:51 +0100 | [diff] [blame] | 2202 | /* Allow as many queues as there are CPUs inut max. 8 if user has not |
Wei Liu | 32a8440 | 2015-09-10 11:18:58 +0100 | [diff] [blame] | 2203 | * specified a value. |
| 2204 | */ |
| 2205 | if (xennet_max_queues == 0) |
Juergen Gross | 034702a | 2017-01-10 14:32:51 +0100 | [diff] [blame] | 2206 | xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT, |
| 2207 | num_online_cpus()); |
Andrew J. Bennieston | 50ee606 | 2014-06-04 10:30:45 +0100 | [diff] [blame] | 2208 | |
Al Viro | ffb78a2 | 2008-11-22 17:38:14 +0000 | [diff] [blame] | 2209 | return xenbus_register_frontend(&netfront_driver); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2210 | } |
| 2211 | module_init(netif_init); |
| 2212 | |
| 2213 | |
| 2214 | static void __exit netif_exit(void) |
| 2215 | { |
Al Viro | ffb78a2 | 2008-11-22 17:38:14 +0000 | [diff] [blame] | 2216 | xenbus_unregister_driver(&netfront_driver); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 2217 | } |
| 2218 | module_exit(netif_exit); |
| 2219 | |
| 2220 | MODULE_DESCRIPTION("Xen virtual network device frontend"); |
| 2221 | MODULE_LICENSE("GPL"); |
Mark McLoughlin | d2f0c52 | 2008-04-02 10:54:05 -0700 | [diff] [blame] | 2222 | MODULE_ALIAS("xen:vif"); |
Mark McLoughlin | 4f93f09b | 2008-04-02 10:54:06 -0700 | [diff] [blame] | 2223 | MODULE_ALIAS("xennet"); |