blob: 482c6c8b0fb7e0fb2476d52b41156b45903a46fe [file] [log] [blame]
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001/*
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 Perches383eda32013-06-27 21:57:49 -070032#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070034#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 Liu9ecd1a72013-04-22 02:20:41 +000041#include <net/tcp.h>
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070042#include <linux/udp.h>
43#include <linux/moduleparam.h>
44#include <linux/mm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090045#include <linux/slab.h>
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070046#include <net/ip.h>
47
Jeremy Fitzhardinge1ccbf532009-10-06 15:11:14 -070048#include <xen/xen.h>
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070049#include <xen/xenbus.h>
50#include <xen/events.h>
51#include <xen/page.h>
Igor Mammedovb9136d22012-03-21 15:08:38 +010052#include <xen/platform_pci.h>
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070053#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. Bennieston50ee6062014-06-04 10:30:45 +010059/* Module parameters */
Juergen Gross034702a2017-01-10 14:32:51 +010060#define MAX_QUEUES_DEFAULT 8
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +010061static unsigned int xennet_max_queues;
62module_param_named(max_queues, xennet_max_queues, uint, 0644);
63MODULE_PARM_DESC(max_queues,
64 "Maximum number of queues per virtual interface");
65
Stephen Hemminger0fc0b732009-09-02 01:03:33 -070066static const struct ethtool_ops xennet_ethtool_ops;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070067
68struct netfront_cb {
Ian Campbell36832432012-08-22 00:26:47 +000069 int pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070070};
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 Grall30c5d7f2015-04-10 14:42:21 +010078#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 Vrabel1f3c2eb2014-10-22 11:17:06 +010080
81/* Minimum number of Rx slots (includes slot for GSO metadata). */
82#define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070083
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +010084/* 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 Gross8edfe2e2018-09-07 14:21:30 +020090static DECLARE_WAIT_QUEUE_HEAD(module_wq);
Eduardo Otubo5b5971d2017-11-23 15:18:35 +010091
stephen hemmingere00f85b2011-06-21 05:35:31 +000092struct netfront_stats {
David Vrabel900e1832015-01-13 16:42:42 +000093 u64 packets;
94 u64 bytes;
stephen hemmingere00f85b2011-06-21 05:35:31 +000095 struct u64_stats_sync syncp;
96};
97
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +010098struct netfront_info;
99
100struct netfront_queue {
101 unsigned int id; /* Queue ID, 0-based */
102 char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */
103 struct netfront_info *info;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700104
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700105 struct napi_struct napi;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700106
Wei Liud634bf22013-05-22 06:34:46 +0000107 /* 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. Bennieston2688fcb2014-06-04 10:30:44 +0100113 char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */
114 char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700115
116 spinlock_t tx_lock;
Jeremy Fitzhardinge84284d32007-10-15 12:59:53 -0700117 struct xen_netif_tx_front_ring tx;
118 int tx_ring_ref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700119
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 Yamahata1ffb40b2008-07-08 15:06:31 -0700131 unsigned long link;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700132 } 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 Licefe0072014-01-28 11:35:42 +0800135 struct page *grant_tx_page[NET_TX_RING_SIZE];
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700136 unsigned tx_skb_freelist;
137
Jeremy Fitzhardinge84284d32007-10-15 12:59:53 -0700138 spinlock_t rx_lock ____cacheline_aligned_in_smp;
139 struct xen_netif_rx_front_ring rx;
140 int rx_ring_ref;
141
Jeremy Fitzhardinge84284d32007-10-15 12:59:53 -0700142 struct timer_list rx_refill_timer;
143
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700144 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. Bennieston2688fcb2014-06-04 10:30:44 +0100147};
148
149struct 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 Campbelle0ce4af2011-01-27 04:14:03 +0000157
158 /* Statistics */
David Vrabel900e1832015-01-13 16:42:42 +0000159 struct netfront_stats __percpu *rx_stats;
160 struct netfront_stats __percpu *tx_stats;
stephen hemmingere00f85b2011-06-21 05:35:31 +0000161
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100162 atomic_t rx_gso_checksum_fixup;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700163};
164
165struct 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 Yamahata1ffb40b2008-07-08 15:06:31 -0700170static void skb_entry_set_link(union skb_entry *list, unsigned short id)
171{
172 list->link = id;
173}
174
175static int skb_entry_is_link(const union skb_entry *list)
176{
177 BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link));
Eric Dumazet807540b2010-09-23 05:40:09 +0000178 return (unsigned long)list->skb < PAGE_OFFSET;
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700179}
180
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700181/*
182 * Access macros for acquiring freeing slots in tx_skbs[].
183 */
184
185static void add_id_to_freelist(unsigned *head, union skb_entry *list,
186 unsigned short id)
187{
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700188 skb_entry_set_link(&list[id], *head);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700189 *head = id;
190}
191
192static 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
200static int xennet_rxidx(RING_IDX idx)
201{
202 return idx & (NET_RX_RING_SIZE - 1);
203}
204
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100205static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700206 RING_IDX ri)
207{
208 int i = xennet_rxidx(ri);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100209 struct sk_buff *skb = queue->rx_skbs[i];
210 queue->rx_skbs[i] = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700211 return skb;
212}
213
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100214static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700215 RING_IDX ri)
216{
217 int i = xennet_rxidx(ri);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100218 grant_ref_t ref = queue->grant_rx_ref[i];
219 queue->grant_rx_ref[i] = GRANT_INVALID_REF;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700220 return ref;
221}
222
223#ifdef CONFIG_SYSFS
Takashi Iwai27b917e2015-02-04 14:38:55 +0100224static const struct attribute_group xennet_dev_group;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700225#endif
226
Michał Mirosław3ad9b352011-11-16 14:05:33 +0000227static bool xennet_can_sg(struct net_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700228{
Michał Mirosław3ad9b352011-11-16 14:05:33 +0000229 return dev->features & NETIF_F_SG;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700230}
231
232
Kees Cooke99e88a2017-10-16 14:43:17 -0700233static void rx_refill_timeout(struct timer_list *t)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700234{
Kees Cooke99e88a2017-10-16 14:43:17 -0700235 struct netfront_queue *queue = from_timer(queue, t, rx_refill_timer);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100236 napi_schedule(&queue->napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700237}
238
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100239static int netfront_tx_slot_available(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700240{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100241 return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) <
Juergen Gross57f230a2018-06-12 08:57:53 +0200242 (NET_TX_RING_SIZE - XEN_NETIF_NR_SLOTS_MIN - 1);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700243}
244
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100245static void xennet_maybe_wake_tx(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700246{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100247 struct net_device *dev = queue->info->netdev;
248 struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700249
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100250 if (unlikely(netif_tx_queue_stopped(dev_queue)) &&
251 netfront_tx_slot_available(queue) &&
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700252 likely(netif_running(dev)))
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100253 netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700254}
255
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100256
257static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700258{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700259 struct sk_buff *skb;
260 struct page *page;
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100261
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
283static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
284{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100285 RING_IDX req_prod = queue->rx.req_prod_pvt;
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100286 int notify;
Vineeth Remanan Pillai538d9292017-02-07 18:59:01 +0000287 int err = 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700288
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100289 if (unlikely(!netif_carrier_ok(queue->info->netdev)))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700290 return;
291
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100292 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 Grall30c5d7f2015-04-10 14:42:21 +0100298 struct page *page;
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100299 struct xen_netif_rx_request *req;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700300
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100301 skb = xennet_alloc_one_rx_buffer(queue);
Vineeth Remanan Pillai538d9292017-02-07 18:59:01 +0000302 if (!skb) {
303 err = -ENOMEM;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700304 break;
Vineeth Remanan Pillai538d9292017-02-07 18:59:01 +0000305 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700306
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100307 id = xennet_rxidx(req_prod);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700308
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100309 BUG_ON(queue->rx_skbs[id]);
310 queue->rx_skbs[id] = skb;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700311
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100312 ref = gnttab_claim_grant_reference(&queue->gref_rx_head);
Dongli Zhang269ebce2016-11-02 09:04:33 +0800313 WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref));
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100314 queue->grant_rx_ref[id] = ref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700315
Julien Grall30c5d7f2015-04-10 14:42:21 +0100316 page = skb_frag_page(&skb_shinfo(skb)->frags[0]);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700317
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100318 req = RING_GET_REQUEST(&queue->rx, req_prod);
Julien Grall30c5d7f2015-04-10 14:42:21 +0100319 gnttab_page_grant_foreign_access_ref_one(ref,
320 queue->info->xbdev->otherend_id,
321 page,
322 0);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700323 req->id = id;
324 req->gref = ref;
325 }
326
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100327 queue->rx.req_prod_pvt = req_prod;
328
Vineeth Remanan Pillai538d9292017-02-07 18:59:01 +0000329 /* 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 Vrabel1f3c2eb2014-10-22 11:17:06 +0100336 mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10));
337 return;
338 }
339
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100340 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700341 if (notify)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100342 notify_remote_via_irq(queue->rx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700343}
344
345static int xennet_open(struct net_device *dev)
346{
347 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100348 unsigned int num_queues = dev->real_num_tx_queues;
349 unsigned int i = 0;
350 struct netfront_queue *queue = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700351
Ross Lagerwallf599c642018-01-11 09:36:38 +0000352 if (!np->queues)
353 return -ENODEV;
354
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100355 for (i = 0; i < num_queues; ++i) {
356 queue = &np->queues[i];
357 napi_enable(&queue->napi);
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700358
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100359 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 Fitzhardinge0d160212007-07-17 18:37:06 -0700367 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700368
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100369 netif_tx_start_all_queues(dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700370
371 return 0;
372}
373
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100374static void xennet_tx_buf_gc(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700375{
376 RING_IDX cons, prod;
377 unsigned short id;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700378 struct sk_buff *skb;
Malcolm Crossley7d0105b2016-01-26 17:12:44 +0000379 bool more_to_do;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700380
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100381 BUG_ON(!netif_carrier_ok(queue->info->netdev));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700382
383 do {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100384 prod = queue->tx.sring->rsp_prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700385 rmb(); /* Ensure we see responses up to 'rp'. */
386
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100387 for (cons = queue->tx.rsp_cons; cons != prod; cons++) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700388 struct xen_netif_tx_response *txrsp;
389
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100390 txrsp = RING_GET_RESPONSE(&queue->tx, cons);
Ian Campbellf942dc22011-03-15 00:06:18 +0000391 if (txrsp->status == XEN_NETIF_RSP_NULL)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700392 continue;
393
394 id = txrsp->id;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100395 skb = queue->tx_skbs[id].skb;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700396 if (unlikely(gnttab_query_foreign_access(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100397 queue->grant_tx_ref[id]) != 0)) {
Joe Perches383eda32013-06-27 21:57:49 -0700398 pr_alert("%s: warning -- grant still in use by backend domain\n",
399 __func__);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700400 BUG();
401 }
402 gnttab_end_foreign_access_ref(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100403 queue->grant_tx_ref[id], GNTMAP_readonly);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700404 gnttab_release_grant_reference(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100405 &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 Fitzhardinge0d160212007-07-17 18:37:06 -0700409 dev_kfree_skb_irq(skb);
410 }
411
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100412 queue->tx.rsp_cons = prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700413
Malcolm Crossley7d0105b2016-01-26 17:12:44 +0000414 RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do);
415 } while (more_to_do);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700416
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100417 xennet_maybe_wake_tx(queue);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700418}
419
Julien Grall30c5d7f2015-04-10 14:42:21 +0100420struct 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
428static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset,
429 unsigned int len, void *data)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700430{
Julien Grall30c5d7f2015-04-10 14:42:21 +0100431 struct xennet_gnttab_make_txreq *info = data;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700432 unsigned int id;
David Vrabela55e8bb2015-01-13 17:16:44 +0000433 struct xen_netif_tx_request *tx;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700434 grant_ref_t ref;
Julien Grall30c5d7f2015-04-10 14:42:21 +0100435 /* convenient aliases */
436 struct page *page = info->page;
437 struct netfront_queue *queue = info->queue;
438 struct sk_buff *skb = info->skb;
David Vrabela55e8bb2015-01-13 17:16:44 +0000439
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 Zhang269ebce2016-11-02 09:04:33 +0800443 WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref));
David Vrabela55e8bb2015-01-13 17:16:44 +0000444
Julien Grall30c5d7f2015-04-10 14:42:21 +0100445 gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id,
446 gfn, GNTMAP_readonly);
David Vrabela55e8bb2015-01-13 17:16:44 +0000447
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 Grall30c5d7f2015-04-10 14:42:21 +0100458 info->tx = tx;
459 info->size += tx->size;
460}
461
462static 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
478static 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 Vrabela55e8bb2015-01-13 17:16:44 +0000486}
487
488static 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 Grall30c5d7f2015-04-10 14:42:21 +0100493 struct xennet_gnttab_make_txreq info = {
494 .queue = queue,
495 .skb = skb,
496 .tx = tx,
497 };
498
David Vrabela55e8bb2015-01-13 17:16:44 +0000499 /* Skip unused frames from start of page */
500 page += offset >> PAGE_SHIFT;
501 offset &= ~PAGE_MASK;
502
503 while (len) {
Julien Grall30c5d7f2015-04-10 14:42:21 +0100504 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 Vrabela55e8bb2015-01-13 17:16:44 +0000511 page++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700512 offset = 0;
Julien Grall30c5d7f2015-04-10 14:42:21 +0100513 len -= info.size;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700514 }
515
Julien Grall30c5d7f2015-04-10 14:42:21 +0100516 return info.tx;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700517}
518
Ian Campbellf36c3742012-11-21 02:02:16 +0000519/*
David Vrabele84448d2015-01-13 17:16:43 +0000520 * Count how many ring slots are required to send this skb. Each frag
521 * might be a compound page.
Ian Campbellf36c3742012-11-21 02:02:16 +0000522 */
David Vrabele84448d2015-01-13 17:16:43 +0000523static int xennet_count_skb_slots(struct sk_buff *skb)
Ian Campbellf36c3742012-11-21 02:02:16 +0000524{
525 int i, frags = skb_shinfo(skb)->nr_frags;
Julien Grall30c5d7f2015-04-10 14:42:21 +0100526 int slots;
David Vrabele84448d2015-01-13 17:16:43 +0000527
Julien Grall30c5d7f2015-04-10 14:42:21 +0100528 slots = gnttab_count_grant(offset_in_page(skb->data),
529 skb_headlen(skb));
Ian Campbellf36c3742012-11-21 02:02:16 +0000530
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 Lemonb54c9d52019-07-30 07:40:33 -0700534 unsigned long offset = skb_frag_off(frag);
Ian Campbellf36c3742012-11-21 02:02:16 +0000535
536 /* Skip unused frames from start of page */
537 offset &= ~PAGE_MASK;
538
Julien Grall30c5d7f2015-04-10 14:42:21 +0100539 slots += gnttab_count_grant(offset, size);
Ian Campbellf36c3742012-11-21 02:02:16 +0000540 }
541
Julien Grall30c5d7f2015-04-10 14:42:21 +0100542 return slots;
Ian Campbellf36c3742012-11-21 02:02:16 +0000543}
544
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +0100545static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb,
Paolo Abenia350ecc2019-03-20 11:02:06 +0100546 struct net_device *sb_dev)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100547{
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +0100548 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. Bennieston2688fcb2014-06-04 10:30:44 +0100561}
562
Julien Grall30c5d7f2015-04-10 14:42:21 +0100563#define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1)
564
Luc Van Oostenryck24a94b32018-04-24 15:18:14 +0200565static netdev_tx_t xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700566{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700567 struct netfront_info *np = netdev_priv(dev);
David Vrabel900e1832015-01-13 16:42:42 +0000568 struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats);
David Vrabela55e8bb2015-01-13 17:16:44 +0000569 struct xen_netif_tx_request *tx, *first_tx;
570 unsigned int i;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700571 int notify;
Ian Campbellf36c3742012-11-21 02:02:16 +0000572 int slots;
David Vrabela55e8bb2015-01-13 17:16:44 +0000573 struct page *page;
574 unsigned int offset;
575 unsigned int len;
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +0000576 unsigned long flags;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100577 struct netfront_queue *queue = NULL;
578 unsigned int num_queues = dev->real_num_tx_queues;
579 u16 queue_index;
Vitaly Kuznetsovfd071602016-09-19 12:53:40 +0200580 struct sk_buff *nskb;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100581
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 Fitzhardinge0d160212007-07-17 18:37:06 -0700588
Wei Liu9ecd1a72013-04-22 02:20:41 +0000589 /* 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 Vrabele84448d2015-01-13 17:16:43 +0000599 slots = xennet_count_skb_slots(skb);
Julien Grall30c5d7f2015-04-10 14:42:21 +0100600 if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) {
Zoltan Kiss97a6d1b2014-08-11 18:32:23 +0100601 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 Fitzhardinge0d160212007-07-17 18:37:06 -0700605 }
606
David Vrabela55e8bb2015-01-13 17:16:44 +0000607 page = virt_to_page(skb->data);
608 offset = offset_in_page(skb->data);
Vitaly Kuznetsovfd071602016-09-19 12:53:40 +0200609
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 Dumazet62f32502017-08-30 10:32:58 -0700617 dev_consume_skb_any(skb);
Vitaly Kuznetsovfd071602016-09-19 12:53:40 +0200618 skb = nskb;
619 page = virt_to_page(skb->data);
620 offset = offset_in_page(skb->data);
621 }
622
David Vrabela55e8bb2015-01-13 17:16:44 +0000623 len = skb_headlen(skb);
624
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100625 spin_lock_irqsave(&queue->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700626
627 if (unlikely(!netif_carrier_ok(dev) ||
Ian Campbellf36c3742012-11-21 02:02:16 +0000628 (slots > 1 && !xennet_can_sg(dev)) ||
Johannes Berg8b86a612015-04-17 15:45:04 +0200629 netif_needs_gso(skb, netif_skb_features(skb)))) {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100630 spin_unlock_irqrestore(&queue->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700631 goto drop;
632 }
633
David Vrabela55e8bb2015-01-13 17:16:44 +0000634 /* First request for the linear area. */
Julien Grall30c5d7f2015-04-10 14:42:21 +0100635 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 Vrabela55e8bb2015-01-13 17:16:44 +0000642 len -= tx->size;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700643
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700644 if (skb->ip_summed == CHECKSUM_PARTIAL)
645 /* local packet? */
Ian Campbellf942dc22011-03-15 00:06:18 +0000646 tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700647 else if (skb->ip_summed == CHECKSUM_UNNECESSARY)
648 /* remote but checksummed. */
Ian Campbellf942dc22011-03-15 00:06:18 +0000649 tx->flags |= XEN_NETTXF_data_validated;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700650
David Vrabela55e8bb2015-01-13 17:16:44 +0000651 /* Optional extra info after the first request. */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700652 if (skb_shinfo(skb)->gso_size) {
653 struct xen_netif_extra_info *gso;
654
655 gso = (struct xen_netif_extra_info *)
David Vrabela55e8bb2015-01-13 17:16:44 +0000656 RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700657
Wei Liue2d617c2013-03-25 01:08:17 +0000658 tx->flags |= XEN_NETTXF_extra_info;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700659
660 gso->u.gso.size = skb_shinfo(skb)->gso_size;
Paul Durrant2c0057d2014-01-15 17:30:33 +0000661 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 Fitzhardinge0d160212007-07-17 18:37:06 -0700664 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 Fitzhardinge0d160212007-07-17 18:37:06 -0700669 }
670
David Vrabela55e8bb2015-01-13 17:16:44 +0000671 /* Requests for the rest of the linear area. */
672 tx = xennet_make_txreqs(queue, tx, skb, page, offset, len);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700673
David Vrabela55e8bb2015-01-13 17:16:44 +0000674 /* 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 Lemonb54c9d52019-07-30 07:40:33 -0700677 tx = xennet_make_txreqs(queue, tx, skb, skb_frag_page(frag),
678 skb_frag_off(frag),
David Vrabela55e8bb2015-01-13 17:16:44 +0000679 skb_frag_size(frag));
680 }
681
682 /* First request has the packet length. */
683 first_tx->size = skb->len;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700684
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100685 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700686 if (notify)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100687 notify_remote_via_irq(queue->tx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700688
David Vrabel900e1832015-01-13 16:42:42 +0000689 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 Fitzhardinge10a273a2007-08-13 12:54:37 -0700693
694 /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100695 xennet_tx_buf_gc(queue);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700696
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100697 if (!netfront_tx_slot_available(queue))
698 netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700699
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100700 spin_unlock_irqrestore(&queue->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700701
Patrick McHardy6ed10652009-06-23 06:03:08 +0000702 return NETDEV_TX_OK;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700703
704 drop:
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700705 dev->stats.tx_dropped++;
Eric W. Biederman979de8a2014-03-15 18:33:04 -0700706 dev_kfree_skb_any(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000707 return NETDEV_TX_OK;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700708}
709
710static int xennet_close(struct net_device *dev)
711{
712 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100713 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 Fitzhardinge0d160212007-07-17 18:37:06 -0700721 return 0;
722}
723
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100724static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700725 grant_ref_t ref)
726{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100727 int new = xennet_rxidx(queue->rx.req_prod_pvt);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700728
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100729 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 Fitzhardinge0d160212007-07-17 18:37:06 -0700735}
736
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100737static int xennet_get_extras(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700738 struct xen_netif_extra_info *extras,
739 RING_IDX rp)
740
741{
742 struct xen_netif_extra_info *extra;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100743 struct device *dev = &queue->info->netdev->dev;
744 RING_IDX cons = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700745 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. Bennieston2688fcb2014-06-04 10:30:44 +0100759 RING_GET_RESPONSE(&queue->rx, ++cons);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700760
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. Bennieston2688fcb2014-06-04 10:30:44 +0100772 skb = xennet_get_rx_skb(queue, cons);
773 ref = xennet_get_rx_ref(queue, cons);
774 xennet_move_rx_slot(queue, skb, ref);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700775 } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE);
776
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100777 queue->rx.rsp_cons = cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700778 return err;
779}
780
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100781static int xennet_get_responses(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700782 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. Bennieston2688fcb2014-06-04 10:30:44 +0100787 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 Gross57f230a2018-06-12 08:57:53 +0200791 int max = XEN_NETIF_NR_SLOTS_MIN + (rx->status <= RX_COPY_THRESHOLD);
Wei Liu7158ff62013-03-25 01:08:19 +0000792 int slots = 1;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700793 int err = 0;
794 unsigned long ret;
795
Ian Campbellf942dc22011-03-15 00:06:18 +0000796 if (rx->flags & XEN_NETRXF_extra_info) {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100797 err = xennet_get_extras(queue, extras, rp);
798 cons = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700799 }
800
801 for (;;) {
802 if (unlikely(rx->status < 0 ||
Julien Grall30c5d7f2015-04-10 14:42:21 +0100803 rx->offset + rx->status > XEN_PAGE_SIZE)) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700804 if (net_ratelimit())
Julien Grall6c101272015-06-16 20:10:46 +0100805 dev_warn(dev, "rx->offset: %u, size: %d\n",
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700806 rx->offset, rx->status);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100807 xennet_move_rx_slot(queue, skb, ref);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700808 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 Liu697089d2013-04-22 02:20:40 +0000815 * situation to the system controller to reboot the backend.
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700816 */
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. Bennieston2688fcb2014-06-04 10:30:44 +0100828 gnttab_release_grant_reference(&queue->gref_rx_head, ref);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700829
830 __skb_queue_tail(list, skb);
831
832next:
Ian Campbellf942dc22011-03-15 00:06:18 +0000833 if (!(rx->flags & XEN_NETRXF_more_data))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700834 break;
835
Wei Liu7158ff62013-03-25 01:08:19 +0000836 if (cons + slots == rp) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700837 if (net_ratelimit())
Wei Liu7158ff62013-03-25 01:08:19 +0000838 dev_warn(dev, "Need more slots\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700839 err = -ENOENT;
840 break;
841 }
842
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100843 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 Liu7158ff62013-03-25 01:08:19 +0000846 slots++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700847 }
848
Wei Liu7158ff62013-03-25 01:08:19 +0000849 if (unlikely(slots > max)) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700850 if (net_ratelimit())
Wei Liu697089d2013-04-22 02:20:40 +0000851 dev_warn(dev, "Too many slots\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700852 err = -E2BIG;
853 }
854
855 if (unlikely(err))
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100856 queue->rx.rsp_cons = cons + slots;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700857
858 return err;
859}
860
861static 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 Perches383eda32013-06-27 21:57:49 -0700866 pr_warn("GSO size must not be zero\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700867 return -EINVAL;
868 }
869
Paul Durrant2c0057d2014-01-15 17:30:33 +0000870 if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 &&
871 gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700872 if (net_ratelimit())
Joe Perches383eda32013-06-27 21:57:49 -0700873 pr_warn("Bad GSO type %d\n", gso->u.gso.type);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700874 return -EINVAL;
875 }
876
877 skb_shinfo(skb)->gso_size = gso->u.gso.size;
Paul Durrant2c0057d2014-01-15 17:30:33 +0000878 skb_shinfo(skb)->gso_type =
879 (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ?
880 SKB_GSO_TCPV4 :
881 SKB_GSO_TCPV6;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700882
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 Zhanga7611292019-10-01 21:56:41 +0800890static int xennet_fill_frags(struct netfront_queue *queue,
891 struct sk_buff *skb,
892 struct sk_buff_head *list)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700893{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100894 RING_IDX cons = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700895 struct sk_buff *nskb;
896
897 while ((nskb = __skb_dequeue(list))) {
898 struct xen_netif_rx_response *rx =
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100899 RING_GET_RESPONSE(&queue->rx, ++cons);
Ian Campbell01c68022011-10-05 00:28:47 +0000900 skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0];
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700901
Juergen Grossd472b3a2018-08-09 16:42:16 +0200902 if (skb_shinfo(skb)->nr_frags == MAX_SKB_FRAGS) {
Jan Beulich093b9c72013-07-17 08:09:37 +0100903 unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700904
Juergen Grossd81c5052018-12-18 16:06:19 +0100905 BUG_ON(pull_to < skb_headlen(skb));
Jan Beulich093b9c72013-07-17 08:09:37 +0100906 __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
907 }
Juergen Grossad4f15d2018-09-11 09:04:48 +0200908 if (unlikely(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) {
Dongli Zhang00b36852019-09-16 11:46:59 +0800909 queue->rx.rsp_cons = ++cons + skb_queue_len(list);
Juergen Grossad4f15d2018-09-11 09:04:48 +0200910 kfree_skb(nskb);
Dongli Zhanga7611292019-10-01 21:56:41 +0800911 return -ENOENT;
Juergen Grossad4f15d2018-09-11 09:04:48 +0200912 }
Jan Beulich093b9c72013-07-17 08:09:37 +0100913
Juergen Grossd472b3a2018-08-09 16:42:16 +0200914 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
915 skb_frag_page(nfrag),
Jan Beulich093b9c72013-07-17 08:09:37 +0100916 rx->offset, rx->status, PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700917
918 skb_shinfo(nskb)->nr_frags = 0;
919 kfree_skb(nskb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700920 }
921
Dongli Zhanga7611292019-10-01 21:56:41 +0800922 queue->rx.rsp_cons = cons;
923
924 return 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700925}
926
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000927static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700928{
Paul Durrantb5cf66c2014-01-09 10:02:48 +0000929 bool recalculate_partial_csum = false;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000930
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. Bennieston2688fcb2014-06-04 10:30:44 +0100939 atomic_inc(&np->rx_gso_checksum_fixup);
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000940 skb->ip_summed = CHECKSUM_PARTIAL;
Paul Durrantb5cf66c2014-01-09 10:02:48 +0000941 recalculate_partial_csum = true;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000942 }
943
944 /* A non-CHECKSUM_PARTIAL SKB does not require setup. */
945 if (skb->ip_summed != CHECKSUM_PARTIAL)
946 return 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700947
Paul Durrantb5cf66c2014-01-09 10:02:48 +0000948 return skb_checksum_setup(skb, recalculate_partial_csum);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700949}
950
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100951static int handle_incoming_queue(struct netfront_queue *queue,
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700952 struct sk_buff_head *rxq)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700953{
David Vrabel900e1832015-01-13 16:42:42 +0000954 struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700955 int packets_dropped = 0;
956 struct sk_buff *skb;
957
958 while ((skb = __skb_dequeue(rxq)) != NULL) {
Ian Campbell36832432012-08-22 00:26:47 +0000959 int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700960
Jan Beulich093b9c72013-07-17 08:09:37 +0100961 if (pull_to > skb_headlen(skb))
962 __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700963
964 /* Ethernet work: Delayed to here as it peeks the header. */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100965 skb->protocol = eth_type_trans(skb, queue->info->netdev);
Wei Liud554f732014-02-19 18:48:34 +0000966 skb_reset_network_header(skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700967
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100968 if (checksum_setup(queue->info->netdev, skb)) {
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000969 kfree_skb(skb);
970 packets_dropped++;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100971 queue->info->netdev->stats.rx_errors++;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000972 continue;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700973 }
974
David Vrabel900e1832015-01-13 16:42:42 +0000975 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 Fitzhardinge0d160212007-07-17 18:37:06 -0700979
980 /* Pass it up. */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100981 napi_gro_receive(&queue->napi, skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700982 }
983
984 return packets_dropped;
985}
986
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700987static int xennet_poll(struct napi_struct *napi, int budget)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700988{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100989 struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi);
990 struct net_device *dev = queue->info->netdev;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700991 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 Hemmingerbea33482007-10-03 16:41:36 -0700996 int work_done;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700997 struct sk_buff_head rxq;
998 struct sk_buff_head errq;
999 struct sk_buff_head tmpq;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001000 int err;
1001
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001002 spin_lock(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001003
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001004 skb_queue_head_init(&rxq);
1005 skb_queue_head_init(&errq);
1006 skb_queue_head_init(&tmpq);
1007
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001008 rp = queue->rx.sring->rsp_prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001009 rmb(); /* Ensure we see queued responses up to 'rp'. */
1010
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001011 i = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001012 work_done = 0;
1013 while ((i != rp) && (work_done < budget)) {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001014 memcpy(rx, RING_GET_RESPONSE(&queue->rx, i), sizeof(*rx));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001015 memset(extras, 0, sizeof(rinfo.extras));
1016
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001017 err = xennet_get_responses(queue, &rinfo, rp, &tmpq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001018
1019 if (unlikely(err)) {
1020err:
1021 while ((skb = __skb_dequeue(&tmpq)))
1022 __skb_queue_tail(&errq, skb);
Jeff Garzik09f75cd2007-10-03 17:41:50 -07001023 dev->stats.rx_errors++;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001024 i = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001025 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. Bennieston2688fcb2014-06-04 10:30:44 +01001036 queue->rx.rsp_cons += skb_queue_len(&tmpq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001037 goto err;
1038 }
1039 }
1040
Ian Campbell36832432012-08-22 00:26:47 +00001041 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 Fitzhardinge0d160212007-07-17 18:37:06 -07001044
Jonathan Lemonb54c9d52019-07-30 07:40:33 -07001045 skb_frag_off_set(&skb_shinfo(skb)->frags[0], rx->offset);
Ian Campbell36832432012-08-22 00:26:47 +00001046 skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status);
1047 skb->data_len = rx->status;
Jan Beulich093b9c72013-07-17 08:09:37 +01001048 skb->len += rx->status;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001049
Dongli Zhanga7611292019-10-01 21:56:41 +08001050 if (unlikely(xennet_fill_frags(queue, skb, &tmpq)))
Juergen Grossad4f15d2018-09-11 09:04:48 +02001051 goto err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001052
Ian Campbellf942dc22011-03-15 00:06:18 +00001053 if (rx->flags & XEN_NETRXF_csum_blank)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001054 skb->ip_summed = CHECKSUM_PARTIAL;
Ian Campbellf942dc22011-03-15 00:06:18 +00001055 else if (rx->flags & XEN_NETRXF_data_validated)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001056 skb->ip_summed = CHECKSUM_UNNECESSARY;
1057
1058 __skb_queue_tail(&rxq, skb);
1059
Dongli Zhanga7611292019-10-01 21:56:41 +08001060 i = ++queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001061 work_done++;
1062 }
1063
Wang Chen56cfe5d2008-05-22 18:09:06 +08001064 __skb_queue_purge(&errq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001065
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001066 work_done -= handle_incoming_queue(queue, &rxq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001067
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001068 xennet_alloc_rx_buffers(queue);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001069
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001070 if (work_done < budget) {
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001071 int more_to_do = 0;
1072
Eric Dumazet6ad20162017-01-30 08:22:01 -08001073 napi_complete_done(napi, work_done);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001074
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001075 RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do);
David Vrabel6a6dc082014-12-16 18:59:46 +00001076 if (more_to_do)
1077 napi_schedule(napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001078 }
1079
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001080 spin_unlock(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001081
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001082 return work_done;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001083}
1084
1085static int xennet_change_mtu(struct net_device *dev, int mtu)
1086{
Jonathan Davies0c368202015-03-31 11:05:15 +01001087 int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001088
1089 if (mtu > max)
1090 return -EINVAL;
1091 dev->mtu = mtu;
1092 return 0;
1093}
1094
stephen hemmingerbc1f4472017-01-06 19:12:52 -08001095static void xennet_get_stats64(struct net_device *dev,
1096 struct rtnl_link_stats64 *tot)
stephen hemmingere00f85b2011-06-21 05:35:31 +00001097{
1098 struct netfront_info *np = netdev_priv(dev);
1099 int cpu;
1100
1101 for_each_possible_cpu(cpu) {
David Vrabel900e1832015-01-13 16:42:42 +00001102 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 hemmingere00f85b2011-06-21 05:35:31 +00001104 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1105 unsigned int start;
1106
1107 do {
David Vrabel900e1832015-01-13 16:42:42 +00001108 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 hemmingere00f85b2011-06-21 05:35:31 +00001112
David Vrabel900e1832015-01-13 16:42:42 +00001113 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 hemmingere00f85b2011-06-21 05:35:31 +00001118
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 hemmingere00f85b2011-06-21 05:35:31 +00001127}
1128
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001129static void xennet_release_tx_bufs(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001130{
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. Bennieston2688fcb2014-06-04 10:30:44 +01001136 if (skb_entry_is_link(&queue->tx_skbs[i]))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001137 continue;
1138
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001139 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 Licefe0072014-01-28 11:35:42 +08001142 GNTMAP_readonly,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001143 (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 Fitzhardinge0d160212007-07-17 18:37:06 -07001147 dev_kfree_skb_irq(skb);
1148 }
1149}
1150
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001151static void xennet_release_rx_bufs(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001152{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001153 int id, ref;
1154
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001155 spin_lock_bh(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001156
1157 for (id = 0; id < NET_RX_RING_SIZE; id++) {
Annie Licefe0072014-01-28 11:35:42 +08001158 struct sk_buff *skb;
1159 struct page *page;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001160
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001161 skb = queue->rx_skbs[id];
Annie Licefe0072014-01-28 11:35:42 +08001162 if (!skb)
1163 continue;
1164
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001165 ref = queue->grant_rx_ref[id];
Annie Licefe0072014-01-28 11:35:42 +08001166 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. Bennieston2688fcb2014-06-04 10:30:44 +01001177 queue->grant_rx_ref[id] = GRANT_INVALID_REF;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001178
Annie Licefe0072014-01-28 11:35:42 +08001179 kfree_skb(skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001180 }
1181
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001182 spin_unlock_bh(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001183}
1184
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001185static netdev_features_t xennet_fix_features(struct net_device *dev,
1186 netdev_features_t features)
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001187{
1188 struct netfront_info *np = netdev_priv(dev);
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001189
Juergen Gross2890ea52016-10-31 14:58:41 +01001190 if (features & NETIF_F_SG &&
1191 !xenbus_read_unsigned(np->xbdev->otherend, "feature-sg", 0))
1192 features &= ~NETIF_F_SG;
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001193
Juergen Gross2890ea52016-10-31 14:58:41 +01001194 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 Dumazet8f7b01a2011-04-03 17:21:00 -07001198
Juergen Gross2890ea52016-10-31 14:58:41 +01001199 if (features & NETIF_F_TSO &&
1200 !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv4", 0))
1201 features &= ~NETIF_F_TSO;
Paul Durrant2c0057d2014-01-15 17:30:33 +00001202
Juergen Gross2890ea52016-10-31 14:58:41 +01001203 if (features & NETIF_F_TSO6 &&
1204 !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv6", 0))
1205 features &= ~NETIF_F_TSO6;
Paul Durrant2c0057d2014-01-15 17:30:33 +00001206
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001207 return features;
1208}
1209
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001210static int xennet_set_features(struct net_device *dev,
1211 netdev_features_t features)
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001212{
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 Liud634bf22013-05-22 06:34:46 +00001221static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id)
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001222{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001223 struct netfront_queue *queue = dev_id;
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001224 unsigned long flags;
1225
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001226 spin_lock_irqsave(&queue->tx_lock, flags);
1227 xennet_tx_buf_gc(queue);
1228 spin_unlock_irqrestore(&queue->tx_lock, flags);
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001229
1230 return IRQ_HANDLED;
1231}
1232
Wei Liud634bf22013-05-22 06:34:46 +00001233static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id)
1234{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001235 struct netfront_queue *queue = dev_id;
1236 struct net_device *dev = queue->info->netdev;
Wei Liud634bf22013-05-22 06:34:46 +00001237
1238 if (likely(netif_carrier_ok(dev) &&
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001239 RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)))
David Vrabel76541862014-06-18 10:47:27 +01001240 napi_schedule(&queue->napi);
Wei Liud634bf22013-05-22 06:34:46 +00001241
1242 return IRQ_HANDLED;
1243}
1244
1245static 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 Wilkcf66f9d2012-01-23 08:24:43 +00001252#ifdef CONFIG_NET_POLL_CONTROLLER
1253static void xennet_poll_controller(struct net_device *dev)
1254{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001255 /* 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 Wilkcf66f9d2012-01-23 08:24:43 +00001261}
1262#endif
1263
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001264static const struct net_device_ops xennet_netdev_ops = {
1265 .ndo_open = xennet_open,
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001266 .ndo_stop = xennet_close,
1267 .ndo_start_xmit = xennet_start_xmit,
1268 .ndo_change_mtu = xennet_change_mtu,
stephen hemmingere00f85b2011-06-21 05:35:31 +00001269 .ndo_get_stats64 = xennet_get_stats64,
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001270 .ndo_set_mac_address = eth_mac_addr,
1271 .ndo_validate_addr = eth_validate_addr,
Michał Mirosławfb507932011-03-31 01:01:35 +00001272 .ndo_fix_features = xennet_fix_features,
1273 .ndo_set_features = xennet_set_features,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001274 .ndo_select_queue = xennet_select_queue,
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001275#ifdef CONFIG_NET_POLL_CONTROLLER
1276 .ndo_poll_controller = xennet_poll_controller,
1277#endif
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001278};
1279
David Vrabel900e1832015-01-13 16:42:42 +00001280static 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 Pemberton8e0e46b2012-12-03 09:24:22 -05001289static struct net_device *xennet_create_dev(struct xenbus_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001290{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001291 int err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001292 struct net_device *netdev;
1293 struct netfront_info *np;
1294
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001295 netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues);
Joe Perches41de8d42012-01-29 13:47:52 +00001296 if (!netdev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001297 return ERR_PTR(-ENOMEM);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001298
1299 np = netdev_priv(netdev);
1300 np->xbdev = dev;
1301
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001302 np->queues = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001303
stephen hemmingere00f85b2011-06-21 05:35:31 +00001304 err = -ENOMEM;
David Vrabel900e1832015-01-13 16:42:42 +00001305 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 hemmingere00f85b2011-06-21 05:35:31 +00001310 goto exit;
1311
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001312 netdev->netdev_ops = &xennet_netdev_ops;
1313
Michał Mirosławfb507932011-03-31 01:01:35 +00001314 netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
1315 NETIF_F_GSO_ROBUST;
Paul Durrant2c0057d2014-01-15 17:30:33 +00001316 netdev->hw_features = NETIF_F_SG |
1317 NETIF_F_IPV6_CSUM |
1318 NETIF_F_TSO | NETIF_F_TSO6;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001319
Ian Campbellfc3e5942011-04-04 11:07:57 -07001320 /*
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 Klaebe7ad24ea2014-05-11 00:12:32 +00001328 netdev->ethtool_ops = &xennet_ethtool_ops;
Mohammed Gamale1043a42017-10-16 15:20:32 +02001329 netdev->min_mtu = ETH_MIN_MTU;
Jarod Wilsond0c2c992016-10-20 13:55:21 -04001330 netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001331 SET_NETDEV_DEV(netdev, &dev->dev);
1332
1333 np->netdev = netdev;
1334
1335 netif_carrier_off(netdev);
1336
Eduardo Otubob707fda2018-01-05 09:42:16 +01001337 xenbus_switch_state(dev, XenbusStateInitialising);
Juergen Gross8edfe2e2018-09-07 14:21:30 +02001338 wait_event(module_wq,
1339 xenbus_read_driver_state(dev->otherend) !=
1340 XenbusStateClosed &&
1341 xenbus_read_driver_state(dev->otherend) !=
1342 XenbusStateUnknown);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001343 return netdev;
1344
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001345 exit:
David Vrabel900e1832015-01-13 16:42:42 +00001346 xennet_free_netdev(netdev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001347 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 Pemberton8e0e46b2012-12-03 09:24:22 -05001355static int netfront_probe(struct xenbus_device *dev,
Greg Kroah-Hartman1dd06ae2012-12-06 14:30:56 +00001356 const struct xenbus_device_id *id)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001357{
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-Hartman1b713e02009-05-04 12:40:54 -07001370 dev_set_drvdata(&dev->dev, info);
Takashi Iwai27b917e2015-02-04 14:38:55 +01001371#ifdef CONFIG_SYSFS
1372 info->netdev->sysfs_groups[0] = &xennet_dev_group;
1373#endif
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001374
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001375 return 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001376}
1377
1378static 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
1385static void xennet_disconnect_backend(struct netfront_info *info)
1386{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001387 unsigned int i = 0;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001388 unsigned int num_queues = info->netdev->real_num_tx_queues;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001389
David Vrabelf9feb1e2014-07-02 16:09:15 +01001390 netif_carrier_off(info->netdev);
1391
Chas Williams9a873c72015-08-19 19:14:20 -04001392 for (i = 0; i < num_queues && info->queues; ++i) {
David Vrabel76541862014-06-18 10:47:27 +01001393 struct netfront_queue *queue = &info->queues[i];
1394
Boris Ostrovsky74470952017-01-30 12:45:46 -05001395 del_timer_sync(&queue->rx_refill_timer);
1396
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001397 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 Williams274b0452015-08-27 12:28:46 -04001406 if (netif_running(info->netdev))
1407 napi_synchronize(&queue->napi);
David Vrabelf9feb1e2014-07-02 16:09:15 +01001408
David Vrabela5b5dc32014-07-31 17:38:23 +01001409 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. Bennieston2688fcb2014-06-04 10:30:44 +01001414 /* 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 Liud634bf22013-05-22 06:34:46 +00001422 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001423}
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 */
1431static int netfront_resume(struct xenbus_device *dev)
1432{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001433 struct netfront_info *info = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001434
1435 dev_dbg(&dev->dev, "%s\n", dev->nodename);
1436
1437 xennet_disconnect_backend(info);
1438 return 0;
1439}
1440
1441static 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. Bennieston2688fcb2014-06-04 10:30:44 +01001463static int setup_netfront_single(struct netfront_queue *queue)
Wei Liud634bf22013-05-22 06:34:46 +00001464{
1465 int err;
1466
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001467 err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn);
Wei Liud634bf22013-05-22 06:34:46 +00001468 if (err < 0)
1469 goto fail;
1470
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001471 err = bind_evtchn_to_irqhandler(queue->tx_evtchn,
Wei Liud634bf22013-05-22 06:34:46 +00001472 xennet_interrupt,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001473 0, queue->info->netdev->name, queue);
Wei Liud634bf22013-05-22 06:34:46 +00001474 if (err < 0)
1475 goto bind_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001476 queue->rx_evtchn = queue->tx_evtchn;
1477 queue->rx_irq = queue->tx_irq = err;
Wei Liud634bf22013-05-22 06:34:46 +00001478
1479 return 0;
1480
1481bind_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001482 xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn);
1483 queue->tx_evtchn = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001484fail:
1485 return err;
1486}
1487
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001488static int setup_netfront_split(struct netfront_queue *queue)
Wei Liud634bf22013-05-22 06:34:46 +00001489{
1490 int err;
1491
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001492 err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn);
Wei Liud634bf22013-05-22 06:34:46 +00001493 if (err < 0)
1494 goto fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001495 err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn);
Wei Liud634bf22013-05-22 06:34:46 +00001496 if (err < 0)
1497 goto alloc_rx_evtchn_fail;
1498
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001499 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 Liud634bf22013-05-22 06:34:46 +00001502 xennet_tx_interrupt,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001503 0, queue->tx_irq_name, queue);
Wei Liud634bf22013-05-22 06:34:46 +00001504 if (err < 0)
1505 goto bind_tx_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001506 queue->tx_irq = err;
Wei Liud634bf22013-05-22 06:34:46 +00001507
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001508 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 Liud634bf22013-05-22 06:34:46 +00001511 xennet_rx_interrupt,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001512 0, queue->rx_irq_name, queue);
Wei Liud634bf22013-05-22 06:34:46 +00001513 if (err < 0)
1514 goto bind_rx_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001515 queue->rx_irq = err;
Wei Liud634bf22013-05-22 06:34:46 +00001516
1517 return 0;
1518
1519bind_rx_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001520 unbind_from_irqhandler(queue->tx_irq, queue);
1521 queue->tx_irq = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001522bind_tx_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001523 xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn);
1524 queue->rx_evtchn = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001525alloc_rx_evtchn_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001526 xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn);
1527 queue->tx_evtchn = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001528fail:
1529 return err;
1530}
1531
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001532static int setup_netfront(struct xenbus_device *dev,
1533 struct netfront_queue *queue, unsigned int feature_split_evtchn)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001534{
1535 struct xen_netif_tx_sring *txs;
1536 struct xen_netif_rx_sring *rxs;
Wei Liuccc9d902015-04-03 14:44:59 +08001537 grant_ref_t gref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001538 int err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001539
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001540 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 Fitzhardinge0d160212007-07-17 18:37:06 -07001544
Ian Campbella144ff02008-06-17 10:47:08 +02001545 txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001546 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 Grall30c5d7f2015-04-10 14:42:21 +01001552 FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001553
Wei Liuccc9d902015-04-03 14:44:59 +08001554 err = xenbus_grant_ring(dev, txs, 1, &gref);
Wei Liu1ca29832013-05-20 01:05:12 +00001555 if (err < 0)
1556 goto grant_tx_ring_fail;
Wei Liuccc9d902015-04-03 14:44:59 +08001557 queue->tx_ring_ref = gref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001558
Ian Campbella144ff02008-06-17 10:47:08 +02001559 rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001560 if (!rxs) {
1561 err = -ENOMEM;
1562 xenbus_dev_fatal(dev, err, "allocating rx ring page");
Wei Liu1ca29832013-05-20 01:05:12 +00001563 goto alloc_rx_ring_fail;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001564 }
1565 SHARED_RING_INIT(rxs);
Julien Grall30c5d7f2015-04-10 14:42:21 +01001566 FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001567
Wei Liuccc9d902015-04-03 14:44:59 +08001568 err = xenbus_grant_ring(dev, rxs, 1, &gref);
Wei Liu1ca29832013-05-20 01:05:12 +00001569 if (err < 0)
1570 goto grant_rx_ring_fail;
Wei Liuccc9d902015-04-03 14:44:59 +08001571 queue->rx_ring_ref = gref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001572
Wei Liud634bf22013-05-22 06:34:46 +00001573 if (feature_split_evtchn)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001574 err = setup_netfront_split(queue);
Wei Liud634bf22013-05-22 06:34:46 +00001575 /* 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. Bennieston2688fcb2014-06-04 10:30:44 +01001580 err = setup_netfront_single(queue);
Wei Liud634bf22013-05-22 06:34:46 +00001581
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001582 if (err)
Wei Liu1ca29832013-05-20 01:05:12 +00001583 goto alloc_evtchn_fail;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001584
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001585 return 0;
1586
Wei Liu1ca29832013-05-20 01:05:12 +00001587 /* 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 Liu1ca29832013-05-20 01:05:12 +00001590alloc_evtchn_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001591 gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0);
Wei Liu1ca29832013-05-20 01:05:12 +00001592grant_rx_ring_fail:
1593 free_page((unsigned long)rxs);
1594alloc_rx_ring_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001595 gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0);
Wei Liu1ca29832013-05-20 01:05:12 +00001596grant_tx_ring_fail:
1597 free_page((unsigned long)txs);
1598fail:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001599 return err;
1600}
1601
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001602/* Queue-specific initialisation
1603 * This used to be done in xennet_create_dev() but must now
1604 * be run per-queue.
1605 */
1606static int xennet_init_queue(struct netfront_queue *queue)
1607{
1608 unsigned short i;
1609 int err = 0;
Xiao Liang21f27062018-08-14 23:21:28 +08001610 char *devid;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001611
1612 spin_lock_init(&queue->tx_lock);
1613 spin_lock_init(&queue->rx_lock);
1614
Kees Cooke99e88a2017-10-16 14:43:17 -07001615 timer_setup(&queue->rx_refill_timer, rx_refill_timeout, 0);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001616
Xiao Liang21f27062018-08-14 23:21:28 +08001617 devid = strrchr(queue->info->xbdev->nodename, '/') + 1;
1618 snprintf(queue->name, sizeof(queue->name), "vif%s-q%u",
1619 devid, queue->id);
Wei Liu8b715012014-06-04 10:30:47 +01001620
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001621 /* 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 Vrabel1f3c2eb2014-10-22 11:17:06 +01001636 if (gnttab_alloc_grant_references(NET_TX_RING_SIZE,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001637 &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 Vrabel1f3c2eb2014-10-22 11:17:06 +01001644 if (gnttab_alloc_grant_references(NET_RX_RING_SIZE,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001645 &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. Bennieston2688fcb2014-06-04 10:30:44 +01001651 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. Bennieston50ee6062014-06-04 10:30:45 +01001659static 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
1734error:
1735 if (write_hierarchical)
1736 kfree(path);
1737 xenbus_dev_fatal(dev, err, "%s", message);
1738 return err;
1739}
1740
David Vrabelce587252014-06-18 10:47:28 +01001741static void xennet_destroy_queues(struct netfront_info *info)
1742{
1743 unsigned int i;
1744
David Vrabelce587252014-06-18 10:47:28 +01001745 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 Vrabelce587252014-06-18 10:47:28 +01001753 kfree(info->queues);
1754 info->queues = NULL;
1755}
1756
1757static int xennet_create_queues(struct netfront_info *info,
Joe Jinca88ea12015-10-19 13:37:17 +08001758 unsigned int *num_queues)
David Vrabelce587252014-06-18 10:47:28 +01001759{
1760 unsigned int i;
1761 int ret;
1762
Joe Jinca88ea12015-10-19 13:37:17 +08001763 info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue),
David Vrabelce587252014-06-18 10:47:28 +01001764 GFP_KERNEL);
1765 if (!info->queues)
1766 return -ENOMEM;
1767
Joe Jinca88ea12015-10-19 13:37:17 +08001768 for (i = 0; i < *num_queues; i++) {
David Vrabelce587252014-06-18 10:47:28 +01001769 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 Lagerwallf599c642018-01-11 09:36:38 +00001776 dev_warn(&info->xbdev->dev,
David Vrabel69cb8522014-07-31 17:38:24 +01001777 "only created %d queues\n", i);
Joe Jinca88ea12015-10-19 13:37:17 +08001778 *num_queues = i;
David Vrabelce587252014-06-18 10:47:28 +01001779 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 Jinca88ea12015-10-19 13:37:17 +08001788 netif_set_real_num_tx_queues(info->netdev, *num_queues);
David Vrabelce587252014-06-18 10:47:28 +01001789
Joe Jinca88ea12015-10-19 13:37:17 +08001790 if (*num_queues == 0) {
Ross Lagerwallf599c642018-01-11 09:36:38 +00001791 dev_err(&info->xbdev->dev, "no queues\n");
David Vrabelce587252014-06-18 10:47:28 +01001792 return -EINVAL;
1793 }
1794 return 0;
1795}
1796
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001797/* Common code used when first setting up, and when resuming. */
Ian Campbellf502bf22010-08-18 23:27:49 +00001798static int talk_to_netback(struct xenbus_device *dev,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001799 struct netfront_info *info)
1800{
1801 const char *message;
1802 struct xenbus_transaction xbt;
1803 int err;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001804 unsigned int feature_split_evtchn;
1805 unsigned int i = 0;
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001806 unsigned int max_queues = 0;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001807 struct netfront_queue *queue = NULL;
1808 unsigned int num_queues = 1;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001809
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001810 info->netdev->irq = 0;
1811
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001812 /* Check if backend supports multiple queues */
Juergen Gross2890ea52016-10-31 14:58:41 +01001813 max_queues = xenbus_read_unsigned(info->xbdev->otherend,
1814 "multi-queue-max-queues", 1);
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001815 num_queues = min(max_queues, xennet_max_queues);
1816
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001817 /* Check feature-split-event-channels */
Juergen Gross2890ea52016-10-31 14:58:41 +01001818 feature_split_evtchn = xenbus_read_unsigned(info->xbdev->otherend,
1819 "feature-split-event-channels", 0);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001820
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 Lagerwallcb257782018-06-21 14:00:20 +01001825 goto out_unlocked;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001826 }
1827
Ross Lagerwallf599c642018-01-11 09:36:38 +00001828 rtnl_lock();
David Vrabelce587252014-06-18 10:47:28 +01001829 if (info->queues)
1830 xennet_destroy_queues(info);
1831
Joe Jinca88ea12015-10-19 13:37:17 +08001832 err = xennet_create_queues(info, &num_queues);
Ross Lagerwalle2e004a2017-02-08 10:57:37 +00001833 if (err < 0) {
1834 xenbus_dev_fatal(dev, err, "creating queues");
1835 kfree(info->queues);
1836 info->queues = NULL;
1837 goto out;
1838 }
Ross Lagerwallf599c642018-01-11 09:36:38 +00001839 rtnl_unlock();
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001840
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. Bennieston2688fcb2014-06-04 10:30:44 +01001844 err = setup_netfront(dev, queue, feature_split_evtchn);
Ross Lagerwalle2e004a2017-02-08 10:57:37 +00001845 if (err)
1846 goto destroy_ring;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001847 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001848
1849again:
1850 err = xenbus_transaction_start(&xbt);
1851 if (err) {
1852 xenbus_dev_fatal(dev, err, "starting transaction");
1853 goto destroy_ring;
1854 }
1855
chas williams812494d2015-09-16 16:28:25 -04001856 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. Bennieston50ee6062014-06-04 10:30:45 +01001867 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 Liud634bf22013-05-22 06:34:46 +00001871 } else {
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001872 /* 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 Liud634bf22013-05-22 06:34:46 +00001878 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001879 }
1880
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001881 /* The remaining keys are not queue-specific */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001882 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 Durrant2c0057d2014-01-15 17:30:33 +00001907 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 Fitzhardinge0d160212007-07-17 18:37:06 -07001920 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 Fitzhardinge0d160212007-07-17 18:37:06 -07001931 xenbus_dev_fatal(dev, err, "%s", message);
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001932abort_transaction_no_dev_fatal:
1933 xenbus_transaction_end(xbt, 1);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001934 destroy_ring:
1935 xennet_disconnect_backend(info);
Ross Lagerwallf599c642018-01-11 09:36:38 +00001936 rtnl_lock();
Ross Lagerwalle2e004a2017-02-08 10:57:37 +00001937 xennet_destroy_queues(info);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001938 out:
Ross Lagerwallf599c642018-01-11 09:36:38 +00001939 rtnl_unlock();
Ross Lagerwallcb257782018-06-21 14:00:20 +01001940out_unlocked:
Vitaly Kuznetsovd86b5672017-05-11 13:58:06 +02001941 device_unregister(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001942 return err;
1943}
1944
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001945static int xennet_connect(struct net_device *dev)
1946{
1947 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001948 unsigned int num_queues = 0;
David Vrabela5b5dc32014-07-31 17:38:23 +01001949 int err;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001950 unsigned int j = 0;
1951 struct netfront_queue *queue = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001952
Juergen Gross2890ea52016-10-31 14:58:41 +01001953 if (!xenbus_read_unsigned(np->xbdev->otherend, "feature-rx-copy", 0)) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001954 dev_info(&dev->dev,
Joe Perches898eb712007-10-18 03:06:30 -07001955 "backend does not support copying receive path\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001956 return -ENODEV;
1957 }
1958
Ian Campbellf502bf22010-08-18 23:27:49 +00001959 err = talk_to_netback(np->xbdev, np);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001960 if (err)
1961 return err;
1962
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001963 /* talk_to_netback() sets the correct number of queues */
1964 num_queues = dev->real_num_tx_queues;
1965
Ross Lagerwallf599c642018-01-11 09:36:38 +00001966 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 Lagerwall45c81842018-06-21 14:00:21 +01001975 rtnl_lock();
1976 netdev_update_features(dev);
1977 rtnl_unlock();
1978
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001979 /*
David Vrabela5b5dc32014-07-31 17:38:23 +01001980 * All public and private state should now be sane. Get
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001981 * 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. Bennieston2688fcb2014-06-04 10:30:44 +01001986 for (j = 0; j < num_queues; ++j) {
1987 queue = &np->queues[j];
David Vrabelf50b4072014-07-02 16:09:14 +01001988
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001989 notify_remote_via_irq(queue->tx_irq);
1990 if (queue->tx_irq != queue->rx_irq)
1991 notify_remote_via_irq(queue->rx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001992
David Vrabelf50b4072014-07-02 16:09:14 +01001993 spin_lock_irq(&queue->tx_lock);
1994 xennet_tx_buf_gc(queue);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001995 spin_unlock_irq(&queue->tx_lock);
David Vrabelf50b4072014-07-02 16:09:14 +01001996
1997 spin_lock_bh(&queue->rx_lock);
1998 xennet_alloc_rx_buffers(queue);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001999 spin_unlock_bh(&queue->rx_lock);
2000 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002001
2002 return 0;
2003}
2004
2005/**
2006 * Callback received when the backend's state changes.
2007 */
Ian Campbellf502bf22010-08-18 23:27:49 +00002008static void netback_changed(struct xenbus_device *dev,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002009 enum xenbus_state backend_state)
2010{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07002011 struct netfront_info *np = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002012 struct net_device *netdev = np->netdev;
2013
2014 dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state));
2015
Juergen Gross8edfe2e2018-09-07 14:21:30 +02002016 wake_up_all(&module_wq);
2017
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002018 switch (backend_state) {
2019 case XenbusStateInitialising:
2020 case XenbusStateInitialised:
Noboru Iwamatsub78c9512009-10-13 17:22:29 -04002021 case XenbusStateReconfiguring:
2022 case XenbusStateReconfigured:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002023 case XenbusStateUnknown:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002024 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 Ersek08e34eb2011-12-11 01:48:59 +00002032 break;
2033
2034 case XenbusStateConnected:
Amerigo Wangee89bab2012-08-09 22:14:56 +00002035 netdev_notify_peers(netdev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002036 break;
2037
David Vrabelbce3ea82014-02-04 18:50:26 +00002038 case XenbusStateClosed:
2039 if (dev->state == XenbusStateClosed)
2040 break;
Gustavo A. R. Silvaa32b9d92019-04-15 16:11:41 -05002041 /* Fall through - Missed the backend's CLOSING state. */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002042 case XenbusStateClosing:
2043 xenbus_frontend_closed(dev);
2044 break;
2045 }
2046}
2047
Ian Campbelle0ce4af2011-01-27 04:14:03 +00002048static 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
2058static 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
2068static 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. Bennieston2688fcb2014-06-04 10:30:44 +01002075 data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset));
Ian Campbelle0ce4af2011-01-27 04:14:03 +00002076}
2077
2078static 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 Hemminger0fc0b732009-09-02 01:03:33 -07002091static const struct ethtool_ops xennet_ethtool_ops =
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002092{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002093 .get_link = ethtool_op_get_link,
Ian Campbelle0ce4af2011-01-27 04:14:03 +00002094
2095 .get_sset_count = xennet_get_sset_count,
2096 .get_ethtool_stats = xennet_get_ethtool_stats,
2097 .get_strings = xennet_get_strings,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002098};
2099
2100#ifdef CONFIG_SYSFS
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002101static ssize_t show_rxbuf(struct device *dev,
2102 struct device_attribute *attr, char *buf)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002103{
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002104 return sprintf(buf, "%lu\n", NET_RX_RING_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002105}
2106
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002107static ssize_t store_rxbuf(struct device *dev,
2108 struct device_attribute *attr,
2109 const char *buf, size_t len)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002110{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002111 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 Vrabel1f3c2eb2014-10-22 11:17:06 +01002121 /* rxbuf_min and rxbuf_max are no longer configurable. */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002122
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002123 return len;
2124}
2125
Joe Perchesd61e4032018-03-23 15:54:39 -07002126static DEVICE_ATTR(rxbuf_min, 0644, show_rxbuf, store_rxbuf);
2127static DEVICE_ATTR(rxbuf_max, 0644, show_rxbuf, store_rxbuf);
2128static DEVICE_ATTR(rxbuf_cur, 0444, show_rxbuf, NULL);
Takashi Iwai27b917e2015-02-04 14:38:55 +01002129
2130static 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 Fitzhardinge0d160212007-07-17 18:37:06 -07002135};
2136
Takashi Iwai27b917e2015-02-04 14:38:55 +01002137static const struct attribute_group xennet_dev_group = {
2138 .attrs = xennet_dev_attrs
2139};
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002140#endif /* CONFIG_SYSFS */
2141
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05002142static int xennet_remove(struct xenbus_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002143{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07002144 struct netfront_info *info = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002145
2146 dev_dbg(&dev->dev, "%s\n", dev->nodename);
2147
Eduardo Otubo5b5971d2017-11-23 15:18:35 +01002148 if (xenbus_read_driver_state(dev->otherend) != XenbusStateClosed) {
2149 xenbus_switch_state(dev, XenbusStateClosing);
Juergen Gross8edfe2e2018-09-07 14:21:30 +02002150 wait_event(module_wq,
Eduardo Otubo5b5971d2017-11-23 15:18:35 +01002151 xenbus_read_driver_state(dev->otherend) ==
Jason Andryukc2d2e672018-02-28 07:23:23 -05002152 XenbusStateClosing ||
2153 xenbus_read_driver_state(dev->otherend) ==
2154 XenbusStateUnknown);
Eduardo Otubo5b5971d2017-11-23 15:18:35 +01002155
2156 xenbus_switch_state(dev, XenbusStateClosed);
Juergen Gross8edfe2e2018-09-07 14:21:30 +02002157 wait_event(module_wq,
Eduardo Otubo5b5971d2017-11-23 15:18:35 +01002158 xenbus_read_driver_state(dev->otherend) ==
2159 XenbusStateClosed ||
2160 xenbus_read_driver_state(dev->otherend) ==
2161 XenbusStateUnknown);
2162 }
2163
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002164 xennet_disconnect_backend(info);
2165
Ross Lagerwallf599c642018-01-11 09:36:38 +00002166 if (info->netdev->reg_state == NETREG_REGISTERED)
2167 unregister_netdev(info->netdev);
Ian Campbell6bc96d02012-06-25 22:48:41 +00002168
Ross Lagerwallf599c642018-01-11 09:36:38 +00002169 if (info->queues) {
2170 rtnl_lock();
Chas Williams9a873c72015-08-19 19:14:20 -04002171 xennet_destroy_queues(info);
Ross Lagerwallf599c642018-01-11 09:36:38 +00002172 rtnl_unlock();
2173 }
David Vrabel900e1832015-01-13 16:42:42 +00002174 xennet_free_netdev(info->netdev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002175
2176 return 0;
2177}
2178
David Vrabel95afae42014-09-08 17:30:41 +01002179static const struct xenbus_device_id netfront_ids[] = {
2180 { "vif" },
2181 { "" }
2182};
2183
2184static struct xenbus_driver netfront_driver = {
2185 .ids = netfront_ids,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002186 .probe = netfront_probe,
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05002187 .remove = xennet_remove,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002188 .resume = netfront_resume,
Ian Campbellf502bf22010-08-18 23:27:49 +00002189 .otherend_changed = netback_changed,
David Vrabel95afae42014-09-08 17:30:41 +01002190};
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002191
2192static int __init netif_init(void)
2193{
Jeremy Fitzhardinge6e833582008-08-19 13:16:17 -07002194 if (!xen_domain())
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002195 return -ENODEV;
2196
Konrad Rzeszutek Wilk51c71a32013-11-26 15:05:40 -05002197 if (!xen_has_pv_nic_devices())
Igor Mammedovb9136d22012-03-21 15:08:38 +01002198 return -ENODEV;
2199
Joe Perches383eda32013-06-27 21:57:49 -07002200 pr_info("Initialising Xen virtual ethernet driver\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002201
Juergen Gross034702a2017-01-10 14:32:51 +01002202 /* Allow as many queues as there are CPUs inut max. 8 if user has not
Wei Liu32a84402015-09-10 11:18:58 +01002203 * specified a value.
2204 */
2205 if (xennet_max_queues == 0)
Juergen Gross034702a2017-01-10 14:32:51 +01002206 xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT,
2207 num_online_cpus());
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01002208
Al Viroffb78a22008-11-22 17:38:14 +00002209 return xenbus_register_frontend(&netfront_driver);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002210}
2211module_init(netif_init);
2212
2213
2214static void __exit netif_exit(void)
2215{
Al Viroffb78a22008-11-22 17:38:14 +00002216 xenbus_unregister_driver(&netfront_driver);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002217}
2218module_exit(netif_exit);
2219
2220MODULE_DESCRIPTION("Xen virtual network device frontend");
2221MODULE_LICENSE("GPL");
Mark McLoughlind2f0c522008-04-02 10:54:05 -07002222MODULE_ALIAS("xen:vif");
Mark McLoughlin4f93f09b2008-04-02 10:54:06 -07002223MODULE_ALIAS("xennet");