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igb: use new eth_get_headlen interface

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Update igb to drop the igb_get_headlen function in favor of eth_get_headlen.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by:  Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2014-09-05 19:20:43 -04:00 committed by David S. Miller
parent 56193d1bce
commit 24cd23d3d2
1 changed files with 1 additions and 108 deletions
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109
drivers/net/ethernet/intel/igb/igb_main.c
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@ -6768,113 +6768,6 @@ static bool igb_is_non_eop(struct igb_ring *rx_ring,
return true;
}
/**
* igb_get_headlen - determine size of header for LRO/GRO
* @data: pointer to the start of the headers
* @max_len: total length of section to find headers in
*
* This function is meant to determine the length of headers that will
* be recognized by hardware for LRO, and GRO offloads. The main
* motivation of doing this is to only perform one pull for IPv4 TCP
* packets so that we can do basic things like calculating the gso_size
* based on the average data per packet.
**/
static unsigned int igb_get_headlen(unsigned char *data,
unsigned int max_len)
{
union {
unsigned char *network;
/* l2 headers */
struct ethhdr *eth;
struct vlan_hdr *vlan;
/* l3 headers */
struct iphdr *ipv4;
struct ipv6hdr *ipv6;
} hdr;
__be16 protocol;
u8 nexthdr = 0; /* default to not TCP */
u8 hlen;
/* this should never happen, but better safe than sorry */
if (max_len < ETH_HLEN)
return max_len;
/* initialize network frame pointer */
hdr.network = data;
/* set first protocol and move network header forward */
protocol = hdr.eth->h_proto;
hdr.network += ETH_HLEN;
/* handle any vlan tag if present */
if (protocol == htons(ETH_P_8021Q)) {
if ((hdr.network - data) > (max_len - VLAN_HLEN))
return max_len;
protocol = hdr.vlan->h_vlan_encapsulated_proto;
hdr.network += VLAN_HLEN;
}
/* handle L3 protocols */
if (protocol == htons(ETH_P_IP)) {
if ((hdr.network - data) > (max_len - sizeof(struct iphdr)))
return max_len;
/* access ihl as a u8 to avoid unaligned access on ia64 */
hlen = (hdr.network[0] & 0x0F) << 2;
/* verify hlen meets minimum size requirements */
if (hlen < sizeof(struct iphdr))
return hdr.network - data;
/* record next protocol if header is present */
if (!(hdr.ipv4->frag_off & htons(IP_OFFSET)))
nexthdr = hdr.ipv4->protocol;
} else if (protocol == htons(ETH_P_IPV6)) {
if ((hdr.network - data) > (max_len - sizeof(struct ipv6hdr)))
return max_len;
/* record next protocol */
nexthdr = hdr.ipv6->nexthdr;
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)))
return max_len;
/* access doff as a u8 to avoid unaligned access on ia64 */
hlen = (hdr.network[12] & 0xF0) >> 2;
/* verify hlen meets minimum size requirements */
if (hlen < sizeof(struct tcphdr))
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);
}
/* If everything has gone correctly hdr.network should be the
* data section of the packet and will be the end of the header.
* If not then it probably represents the end of the last recognized
* header.
*/
if ((hdr.network - data) < max_len)
return hdr.network - data;
else
return max_len;
}
/**
* igb_pull_tail - igb specific version of skb_pull_tail
* @rx_ring: rx descriptor ring packet is being transacted on
@ -6919,7 +6812,7 @@ static void igb_pull_tail(struct igb_ring *rx_ring,
/* we need the header to contain the greater of either ETH_HLEN or
* 60 bytes if the skb->len is less than 60 for skb_pad.
*/
pull_len = igb_get_headlen(va, IGB_RX_HDR_LEN);
pull_len = eth_get_headlen(va, IGB_RX_HDR_LEN);
/* align pull length to size of long to optimize memcpy performance */
skb_copy_to_linear_data(skb, va, ALIGN(pull_len, sizeof(long)));