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bnx2x: Added FW GRO bridging support 

Since submit 621b4d6 the bnx2x driver support FW GRO.
However, when using the device with GRO enabled in bridging
scenarios throughput is very low, as the bridge expects all
incoming packets to be passed with CHECKSUM_PARTIAL -
a demand which is satisfied by the SW GRO implementation,
but was missed in the bnx2x driver implementation (which returned
CHECKSUM_UNNECESSARY).

Now, given that the traffic is supported by FW GRO (TCP/IP),
the bnx2x driver calculates the pseudo checksum by itself,
passing skbs with CHECKSUM_PARTIAL and giving a much better
throughput when receiving GRO traffic.

Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuval Mintz 2013-01-14 05:11:49 +00:00 committed by David S. Miller
parent ebe61d80b4
commit 9969085e7e
1 changed files with 52 additions and 2 deletions
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54
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
View File

@ -21,6 +21,7 @@
#include <linux/if_vlan.h>
#include <linux/interrupt.h>
#include <linux/ip.h>
#include <net/tcp.h>
#include <net/ipv6.h>
#include <net/ip6_checksum.h>
#include <linux/prefetch.h>
@ -531,7 +532,7 @@ static int bnx2x_fill_frag_skb(struct bnx2x *bp, struct bnx2x_fastpath *fp,
tpa_info->parsing_flags, len_on_bd);
/* set for GRO */
if (fp->mode == TPA_MODE_GRO)
if (fp->mode == TPA_MODE_GRO && skb_shinfo(skb)->gso_size)
skb_shinfo(skb)->gso_type =
(GET_FLAG(tpa_info->parsing_flags,
PARSING_FLAGS_OVER_ETHERNET_PROTOCOL) ==
@ -620,6 +621,55 @@ static void *bnx2x_frag_alloc(const struct bnx2x_fastpath *fp)
}
#ifdef CONFIG_INET
static void bnx2x_gro_ip_csum(struct bnx2x *bp, struct sk_buff *skb)
{
const struct iphdr *iph = ip_hdr(skb);
struct tcphdr *th;
skb_set_transport_header(skb, sizeof(struct iphdr));
th = tcp_hdr(skb);
th->check = ~tcp_v4_check(skb->len - skb_transport_offset(skb),
iph->saddr, iph->daddr, 0);
}
static void bnx2x_gro_ipv6_csum(struct bnx2x *bp, struct sk_buff *skb)
{
struct ipv6hdr *iph = ipv6_hdr(skb);
struct tcphdr *th;
skb_set_transport_header(skb, sizeof(struct ipv6hdr));
th = tcp_hdr(skb);
th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
&iph->saddr, &iph->daddr, 0);
}
#endif
static void bnx2x_gro_receive(struct bnx2x *bp, struct bnx2x_fastpath *fp,
struct sk_buff *skb)
{
#ifdef CONFIG_INET
if (fp->mode == TPA_MODE_GRO && skb_shinfo(skb)->gso_size) {
skb_set_network_header(skb, 0);
switch (be16_to_cpu(skb->protocol)) {
case ETH_P_IP:
bnx2x_gro_ip_csum(bp, skb);
break;
case ETH_P_IPV6:
bnx2x_gro_ipv6_csum(bp, skb);
break;
default:
BNX2X_ERR("FW GRO supports only IPv4/IPv6, not 0x%04x\n",
be16_to_cpu(skb->protocol));
}
tcp_gro_complete(skb);
}
#endif
napi_gro_receive(&fp->napi, skb);
}
static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
struct bnx2x_agg_info *tpa_info,
u16 pages,
@ -673,7 +723,7 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
skb, cqe, cqe_idx)) {
if (tpa_info->parsing_flags & PARSING_FLAGS_VLAN)
__vlan_hwaccel_put_tag(skb, tpa_info->vlan_tag);
napi_gro_receive(&fp->napi, skb);
bnx2x_gro_receive(bp, fp, skb);
} else {
DP(NETIF_MSG_RX_STATUS,
"Failed to allocate new pages - dropping packet!\n");