ixgbe: Add support for IPv6 and UDP to ixgbe_get_headlen

This change adds support for IPv6 and UDP to ixgbe_get_headlen. The
advantage to this is that we can now handle ipv4/UDP, ipv6/TCP, and
ipv6/UDP with a single memcpy instead of having to do them in multiple
pskb_may_pull calls.

A quick bit of testing shows that we increase throughput for a single
session of netperf from 8800Mpbs to about 9300Mpbs in the case of ipv6/TCP.
As such overall ipv6 performance should improve with this change.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Stephen Ko  <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index e2a6691cbd7c..3ef74f893c2e 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1244,6 +1244,7 @@ static unsigned int ixgbe_get_headlen(unsigned char *data,
                 struct vlan_hdr *vlan;
                 /* l3 headers */
                 struct iphdr *ipv4;
+                struct ipv6hdr *ipv6;
         } hdr;
         __be16 protocol;
         u8 nexthdr = 0; /* default to not TCP */
@@ -1284,6 +1285,13 @@ static unsigned int ixgbe_get_headlen(unsigned char *data,
                 /* record next protocol */
                 nexthdr = hdr.ipv4->protocol;
                 hdr.network += hlen;
+        } else if (protocol == __constant_htons(ETH_P_IPV6)) {
+                if ((hdr.network - data) > (max_len - sizeof(struct ipv6hdr)))
+                        return max_len;
+
+                /* record next protocol */
+                nexthdr = hdr.ipv6->nexthdr;
+                hdr.network += sizeof(struct ipv6hdr);
 #ifdef IXGBE_FCOE
         } else if (protocol == __constant_htons(ETH_P_FCOE)) {
                 if ((hdr.network - data) > (max_len - FCOE_HEADER_LEN))
@@ -1294,7 +1302,7 @@ static unsigned int ixgbe_get_headlen(unsigned char *data,
                 return hdr.network - data;
         }
 
-        /* finally sort out TCP */
+        /* finally sort out TCP/UDP */
         if (nexthdr == IPPROTO_TCP) {
                 if ((hdr.network - data) > (max_len - sizeof(struct tcphdr)))
                         return max_len;
@@ -1307,6 +1315,11 @@ static unsigned int ixgbe_get_headlen(unsigned char *data,
                         return hdr.network - data;
 
                 hdr.network += hlen;
+        } else if (nexthdr == IPPROTO_UDP) {
+                if ((hdr.network - data) > (max_len - sizeof(struct udphdr)))
+                        return max_len;
+
+                hdr.network += sizeof(struct udphdr);
         }
 
         /*