diff options
| author | Shreyas Bhatewara <sbhatewara@vmware.com> | 2011-01-14 14:59:41 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-01-15 21:21:12 -0800 |
| commit | 39d4a96fd7d2926e46151adbd18b810aeeea8ec0 (patch) | |
| tree | 555913c044588534f3fcca62e2e3aea023e8e974 | |
| parent | 54da3d00f6e781f69cb8726757d190704b702a8e (diff) | |
| download | op-kernel-dev-39d4a96fd7d2926e46151adbd18b810aeeea8ec0.zip op-kernel-dev-39d4a96fd7d2926e46151adbd18b810aeeea8ec0.tar.gz | |
vmxnet3: Provide required number of bytes in first SG buffer
This is a performance enhancement fix. vmxnet3 device performs better when
provided with at least 54 bytes (ethernet 14 + IP 20+ TCP 20) in the first SG
buffer. For UDP packets driver provides lesser than that in first sg. This
change fixes the same. Also avoid the redundant pskb_may_pull() call.
Signed-off-by: Shreyas N Bhatewara <sbhatewara@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/vmxnet3/vmxnet3_drv.c | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c index f47db1c..a1632a9 100644 --- a/drivers/net/vmxnet3/vmxnet3_drv.c +++ b/drivers/net/vmxnet3/vmxnet3_drv.c @@ -807,30 +807,25 @@ vmxnet3_parse_and_copy_hdr(struct sk_buff *skb, struct vmxnet3_tx_queue *tq, skb_transport_header(skb))->doff * 4; ctx->copy_size = ctx->eth_ip_hdr_size + ctx->l4_hdr_size; } else { - unsigned int pull_size; - if (skb->ip_summed == CHECKSUM_PARTIAL) { ctx->eth_ip_hdr_size = skb_checksum_start_offset(skb); if (ctx->ipv4) { struct iphdr *iph = (struct iphdr *) skb_network_header(skb); - if (iph->protocol == IPPROTO_TCP) { - pull_size = ctx->eth_ip_hdr_size + - sizeof(struct tcphdr); - - if (unlikely(!pskb_may_pull(skb, - pull_size))) { - goto err; - } + if (iph->protocol == IPPROTO_TCP) ctx->l4_hdr_size = ((struct tcphdr *) skb_transport_header(skb))->doff * 4; - } else if (iph->protocol == IPPROTO_UDP) { + else if (iph->protocol == IPPROTO_UDP) + /* + * Use tcp header size so that bytes to + * be copied are more than required by + * the device. + */ ctx->l4_hdr_size = - sizeof(struct udphdr); - } else { + sizeof(struct tcphdr); + else ctx->l4_hdr_size = 0; - } } else { /* for simplicity, don't copy L4 headers */ ctx->l4_hdr_size = 0; |
