enic: Feature Add: Add loopback capability to enic devices
Hardware has the loopback capability to queue the packets transmitted from
a device to the receive queue of the same device. enic now supports the
loopback capability.
Signed-off-by: Scott Feldman <scofeldm@cisco.com>
Signed-off-by: Vasanthy Kolluri <vkolluri@cisco.com>
Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index 413e362..eda5530 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -594,7 +594,7 @@
static inline void enic_queue_wq_skb_cont(struct enic *enic,
struct vnic_wq *wq, struct sk_buff *skb,
- unsigned int len_left)
+ unsigned int len_left, int loopback)
{
skb_frag_t *frag;
@@ -606,13 +606,14 @@
frag->page_offset, frag->size,
PCI_DMA_TODEVICE),
frag->size,
- (len_left == 0)); /* EOP? */
+ (len_left == 0), /* EOP? */
+ loopback);
}
}
static inline void enic_queue_wq_skb_vlan(struct enic *enic,
struct vnic_wq *wq, struct sk_buff *skb,
- int vlan_tag_insert, unsigned int vlan_tag)
+ int vlan_tag_insert, unsigned int vlan_tag, int loopback)
{
unsigned int head_len = skb_headlen(skb);
unsigned int len_left = skb->len - head_len;
@@ -628,15 +629,15 @@
head_len, PCI_DMA_TODEVICE),
head_len,
vlan_tag_insert, vlan_tag,
- eop);
+ eop, loopback);
if (!eop)
- enic_queue_wq_skb_cont(enic, wq, skb, len_left);
+ enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
}
static inline void enic_queue_wq_skb_csum_l4(struct enic *enic,
struct vnic_wq *wq, struct sk_buff *skb,
- int vlan_tag_insert, unsigned int vlan_tag)
+ int vlan_tag_insert, unsigned int vlan_tag, int loopback)
{
unsigned int head_len = skb_headlen(skb);
unsigned int len_left = skb->len - head_len;
@@ -656,15 +657,15 @@
csum_offset,
hdr_len,
vlan_tag_insert, vlan_tag,
- eop);
+ eop, loopback);
if (!eop)
- enic_queue_wq_skb_cont(enic, wq, skb, len_left);
+ enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
}
static inline void enic_queue_wq_skb_tso(struct enic *enic,
struct vnic_wq *wq, struct sk_buff *skb, unsigned int mss,
- int vlan_tag_insert, unsigned int vlan_tag)
+ int vlan_tag_insert, unsigned int vlan_tag, int loopback)
{
unsigned int frag_len_left = skb_headlen(skb);
unsigned int len_left = skb->len - frag_len_left;
@@ -701,7 +702,7 @@
len,
mss, hdr_len,
vlan_tag_insert, vlan_tag,
- eop && (len == frag_len_left));
+ eop && (len == frag_len_left), loopback);
frag_len_left -= len;
offset += len;
}
@@ -727,7 +728,8 @@
dma_addr,
len,
(len_left == 0) &&
- (len == frag_len_left)); /* EOP? */
+ (len == frag_len_left), /* EOP? */
+ loopback);
frag_len_left -= len;
offset += len;
}
@@ -740,22 +742,26 @@
unsigned int mss = skb_shinfo(skb)->gso_size;
unsigned int vlan_tag = 0;
int vlan_tag_insert = 0;
+ int loopback = 0;
if (enic->vlan_group && vlan_tx_tag_present(skb)) {
/* VLAN tag from trunking driver */
vlan_tag_insert = 1;
vlan_tag = vlan_tx_tag_get(skb);
+ } else if (enic->loop_enable) {
+ vlan_tag = enic->loop_tag;
+ loopback = 1;
}
if (mss)
enic_queue_wq_skb_tso(enic, wq, skb, mss,
- vlan_tag_insert, vlan_tag);
+ vlan_tag_insert, vlan_tag, loopback);
else if (skb->ip_summed == CHECKSUM_PARTIAL)
enic_queue_wq_skb_csum_l4(enic, wq, skb,
- vlan_tag_insert, vlan_tag);
+ vlan_tag_insert, vlan_tag, loopback);
else
enic_queue_wq_skb_vlan(enic, wq, skb,
- vlan_tag_insert, vlan_tag);
+ vlan_tag_insert, vlan_tag, loopback);
}
/* netif_tx_lock held, process context with BHs disabled, or BH */
@@ -1275,7 +1281,7 @@
struct enic *enic = vnic_dev_priv(rq->vdev);
struct net_device *netdev = enic->netdev;
struct sk_buff *skb;
- unsigned int len = netdev->mtu + ETH_HLEN;
+ unsigned int len = netdev->mtu + VLAN_ETH_HLEN;
unsigned int os_buf_index = 0;
dma_addr_t dma_addr;
@@ -2441,6 +2447,12 @@
netdev->ethtool_ops = &enic_ethtool_ops;
netdev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
+ if (ENIC_SETTING(enic, LOOP)) {
+ netdev->features &= ~NETIF_F_HW_VLAN_TX;
+ enic->loop_enable = 1;
+ enic->loop_tag = enic->config.loop_tag;
+ dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
+ }
if (ENIC_SETTING(enic, TXCSUM))
netdev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
if (ENIC_SETTING(enic, TSO))