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Commit f2fb4ab2 authored by Alexander Duyck's avatar Alexander Duyck Committed by Jeff Kirsher
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igb: Do not parse past IP header on fragments beyond the first 



This change makes it so that only the first fragment in a series of fragments
will have the L4 header pulled.  Previously we were always pulling the L4
header as well and in the case of UDP this can harm performance since only the
first fragment will have the header, the rest just contain data which should
be left in the paged portion of the packet.

Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 63d4a8f9

drivers/net/ethernet/intel/igb/igb_main.c

+7 −4
Original line number Diff line number Diff line
@@ -6145,20 +6145,23 @@ static unsigned int igb_get_headlen(unsigned char *data, 
		if (hlen < sizeof(struct iphdr))

			return hdr.network - data;



		/* record next protocol */

		/* record next protocol if header is present */

		if (!hdr.ipv4->frag_off)

			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);

		hlen = sizeof(struct ipv6hdr);

	} else {

		return hdr.network - data;

	}



	/* relocate pointer to start of L4 header */

	hdr.network += hlen;



	/* finally sort out TCP */

	if (nexthdr == IPPROTO_TCP) {

		if ((hdr.network - data) > (max_len - sizeof(struct tcphdr)))