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ixgbe: ixgbe_atr() compute l4_proto only if non-paged data has network/transport headers

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For some Tx paths (e.g., tpacket_snd()), ixgbe_atr may be
passed down an sk_buff that has the network and transport
header in the paged data, so it needs to make sure these
headers are available in the headlen bytes to calculate the
l4_proto.

This patch expect that network and transport headers are
already available in the non-paged header dat.  The assumption
is that the caller has set this up if l4_proto based Tx
steering is desired.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Reviewed-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Sowmini Varadhan 2016-10-24 15:36:39 -07:00 committed by Jeff Kirsher
parent 520288218c
commit 9f3c7504fa
1 changed files with 17 additions and 0 deletions
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17
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
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@ -54,6 +54,7 @@
#include <net/pkt_cls.h>
#include <net/tc_act/tc_gact.h>
#include <net/tc_act/tc_mirred.h>
#include <net/vxlan.h>
#include "ixgbe.h"
#include "ixgbe_common.h"
@ -7660,11 +7661,17 @@ static void ixgbe_atr(struct ixgbe_ring *ring,
/* snag network header to get L4 type and address */
skb = first->skb;
hdr.network = skb_network_header(skb);
if (unlikely(hdr.network <= skb->data))
return;
if (skb->encapsulation &&
first->protocol == htons(ETH_P_IP) &&
hdr.ipv4->protocol == IPPROTO_UDP) {
struct ixgbe_adapter *adapter = q_vector->adapter;
if (unlikely(skb_tail_pointer(skb) < hdr.network +
VXLAN_HEADROOM))
return;
/* verify the port is recognized as VXLAN */
if (adapter->vxlan_port &&
udp_hdr(skb)->dest == adapter->vxlan_port)
@ -7675,6 +7682,12 @@ static void ixgbe_atr(struct ixgbe_ring *ring,
hdr.network = skb_inner_network_header(skb);
}
/* Make sure we have at least [minimum IPv4 header + TCP]
* or [IPv6 header] bytes
*/
if (unlikely(skb_tail_pointer(skb) < hdr.network + 40))
return;
/* Currently only IPv4/IPv6 with TCP is supported */
switch (hdr.ipv4->version) {
case IPVERSION:
@ -7694,6 +7707,10 @@ static void ixgbe_atr(struct ixgbe_ring *ring,
if (l4_proto != IPPROTO_TCP)
return;
if (unlikely(skb_tail_pointer(skb) < hdr.network +
hlen + sizeof(struct tcphdr)))
return;
th = (struct tcphdr *)(hdr.network + hlen);
/* skip this packet since the socket is closing */