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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2009-04-16 02:02:07 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-04-16 02:02:07 -0700 |
| commit | 76620aafd66f0004829764940c5466144969cffc (patch) | |
| tree | 38041e6938121b5611546c582cd23f289db047b0 /drivers/net/sfc | |
| parent | 861ab44059350e5cab350238606cf8814abab93b (diff) | |
| download | linux-3.10-76620aafd66f0004829764940c5466144969cffc.tar.gz linux-3.10-76620aafd66f0004829764940c5466144969cffc.tar.bz2 linux-3.10-76620aafd66f0004829764940c5466144969cffc.zip | |
gro: New frags interface to avoid copying shinfo
It turns out that copying a 16-byte area at ~800k times a second
can be really expensive :) This patch redesigns the frags GRO
interface to avoid copying that area twice.
The two disciples of the frags interface have been converted.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/sfc')
| -rw-r--r-- | drivers/net/sfc/rx.c | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/drivers/net/sfc/rx.c b/drivers/net/sfc/rx.c index 66d7fe3db3e..01f9432c31e 100644 --- a/drivers/net/sfc/rx.c +++ b/drivers/net/sfc/rx.c @@ -450,17 +450,27 @@ static void efx_rx_packet_lro(struct efx_channel *channel, /* Pass the skb/page into the LRO engine */ if (rx_buf->page) { - struct napi_gro_fraginfo info; + struct sk_buff *skb = napi_get_frags(napi); - info.frags[0].page = rx_buf->page; - info.frags[0].page_offset = efx_rx_buf_offset(rx_buf); - info.frags[0].size = rx_buf->len; - info.nr_frags = 1; - info.ip_summed = CHECKSUM_UNNECESSARY; - info.len = rx_buf->len; + if (!skb) { + put_page(rx_buf->page); + goto out; + } + + skb_shinfo(skb)->frags[0].page = rx_buf->page; + skb_shinfo(skb)->frags[0].page_offset = + efx_rx_buf_offset(rx_buf); + skb_shinfo(skb)->frags[0].size = rx_buf->len; + skb_shinfo(skb)->nr_frags = 1; + + skb->len = rx_buf->len; + skb->data_len = rx_buf->len; + skb->truesize += rx_buf->len; + skb->ip_summed = CHECKSUM_UNNECESSARY; - napi_gro_frags(napi, &info); + napi_gro_frags(napi); +out: EFX_BUG_ON_PARANOID(rx_buf->skb); rx_buf->page = NULL; } else { |