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>
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1 changed files with 9 additions and 14 deletions
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@ -807,30 +807,25 @@ vmxnet3_parse_and_copy_hdr(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
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skb_transport_header(skb))->doff * 4;
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ctx->copy_size = ctx->eth_ip_hdr_size + ctx->l4_hdr_size;
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} else {
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unsigned int pull_size;
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if (skb->ip_summed == CHECKSUM_PARTIAL) {
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ctx->eth_ip_hdr_size = skb_checksum_start_offset(skb);
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if (ctx->ipv4) {
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struct iphdr *iph = (struct iphdr *)
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skb_network_header(skb);
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if (iph->protocol == IPPROTO_TCP) {
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pull_size = ctx->eth_ip_hdr_size +
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sizeof(struct tcphdr);
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if (unlikely(!pskb_may_pull(skb,
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pull_size))) {
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goto err;
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}
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if (iph->protocol == IPPROTO_TCP)
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ctx->l4_hdr_size = ((struct tcphdr *)
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skb_transport_header(skb))->doff * 4;
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} else if (iph->protocol == IPPROTO_UDP) {
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else if (iph->protocol == IPPROTO_UDP)
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/*
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* Use tcp header size so that bytes to
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* be copied are more than required by
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* the device.
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*/
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ctx->l4_hdr_size =
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sizeof(struct udphdr);
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} else {
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sizeof(struct tcphdr);
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else
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ctx->l4_hdr_size = 0;
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}
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} else {
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/* for simplicity, don't copy L4 headers */
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ctx->l4_hdr_size = 0;
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