ixgbe: Mask off check of frag_off as we only want fragment offset
authorAlexander Duyck <alexander.h.duyck@intel.com>
Fri, 1 Feb 2013 08:56:41 +0000 (08:56 +0000)
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>
Thu, 18 Apr 2013 04:19:09 +0000 (21:19 -0700)
We were incorrectly checking the entire frag_off field when we only wanted the
fragment offset.  As a result we were not pulling in TCP headers when the DNF
flag was set.

To correct that we will now check for frag off using the IP_OFFSET mask.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

index 1339932..d473a7c 100644 (file)
@@ -1337,7 +1337,7 @@ static unsigned int ixgbe_get_headlen(unsigned char *data,
                        return hdr.network - data;
 
                /* record next protocol if header is present */
-               if (!hdr.ipv4->frag_off)
+               if (!(hdr.ipv4->frag_off & htons(IP_OFFSET)))
                        nexthdr = hdr.ipv4->protocol;
        } else if (protocol == __constant_htons(ETH_P_IPV6)) {
                if ((hdr.network - data) > (max_len - sizeof(struct ipv6hdr)))