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scsi: qedi: Add packet filter in light L2 Rx path.

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Add packet filter to avoid unnecessary packet processing in iscsiuio.

Signed-off-by: Manish Rangankar <manish.rangankar@cavium.com>
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Manish Rangankar 2018-11-21 01:25:20 -08:00 committed by Martin K. Petersen
parent d5632b11f0
commit cdd3ff87f1
1 changed files with 24 additions and 0 deletions
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24
drivers/scsi/qedi/qedi_main.c
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@ -659,6 +659,7 @@ static int qedi_ll2_rx(void *cookie, struct sk_buff *skb, u32 arg1, u32 arg2)
struct qedi_uio_dev *udev;
struct qedi_uio_ctrl *uctrl;
struct skb_work_list *work;
struct ethhdr *eh;
u32 prod;
if (!qedi) {
@ -673,6 +674,29 @@ static int qedi_ll2_rx(void *cookie, struct sk_buff *skb, u32 arg1, u32 arg2)
return 0;
}
eh = (struct ethhdr *)skb->data;
/* Undo VLAN encapsulation */
if (eh->h_proto == htons(ETH_P_8021Q)) {
memmove((u8 *)eh + VLAN_HLEN, eh, ETH_ALEN * 2);
eh = (struct ethhdr *)skb_pull(skb, VLAN_HLEN);
skb_reset_mac_header(skb);
}
/* Filter out non FIP/FCoE frames here to free them faster */
if (eh->h_proto != htons(ETH_P_ARP) &&
eh->h_proto != htons(ETH_P_IP) &&
eh->h_proto != htons(ETH_P_IPV6)) {
QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_LL2,
"Dropping frame ethertype [0x%x] len [0x%x].\n",
eh->h_proto, skb->len);
kfree_skb(skb);
return 0;
}
QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_LL2,
"Allowed frame ethertype [0x%x] len [0x%x].\n",
eh->h_proto, skb->len);
udev = qedi->udev;
uctrl = udev->uctrl;