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authorManish Rangankar <manish.rangankar@cavium.com>2018-11-21 01:25:20 -0800
committerMartin K. Petersen <martin.petersen@oracle.com>2018-11-28 20:51:47 -0500
commitcdd3ff87f10813e42ef6573a1c92a91a9fc24709 (patch)
tree14d1be7cab53bb1c4eeffa4b4dc83b4cf3f5a9ca /drivers/scsi/qedi
parentd5632b11f0a17efa6356311e535ae135d178438d (diff)
scsi: qedi: Add packet filter in light L2 Rx path.
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>
Diffstat (limited to 'drivers/scsi/qedi')
-rw-r--r--drivers/scsi/qedi/qedi_main.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/scsi/qedi/qedi_main.c b/drivers/scsi/qedi/qedi_main.c
index 713db9cfae7f..2621deeed0cd 100644
--- a/drivers/scsi/qedi/qedi_main.c
+++ b/drivers/scsi/qedi/qedi_main.c
@@ -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;