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sfc: Feed GRO result into RX allocation policy and interrupt moderation 

When GRO is successfully merging received packets, we should allocate
raw page buffers rather than skbs that will be discarded by GRO.
Otherwise, we should allocate skbs.

GRO also benefits from higher interrupt moderation, so increase the
score for mergeable RX packets.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2009-10-29 07:21:24 +00:00 committed by David S. Miller
parent c7c4b3b6e9
commit 18e1d2beb6
1 changed files with 11 additions and 2 deletions
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13
drivers/net/sfc/rx.c
View File

@ -445,6 +445,7 @@ static void efx_rx_packet_lro(struct efx_channel *channel,
bool checksummed)
{
struct napi_struct *napi = &channel->napi_str;
gro_result_t gro_result;
/* Pass the skb/page into the LRO engine */
if (rx_buf->page) {
@ -452,6 +453,7 @@ static void efx_rx_packet_lro(struct efx_channel *channel,
if (!skb) {
put_page(rx_buf->page);
gro_result = GRO_DROP;
goto out;
}
@ -467,7 +469,7 @@ static void efx_rx_packet_lro(struct efx_channel *channel,
skb->ip_summed =
checksummed ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
napi_gro_frags(napi);
gro_result = napi_gro_frags(napi);
out:
EFX_BUG_ON_PARANOID(rx_buf->skb);
@ -476,9 +478,16 @@ out:
EFX_BUG_ON_PARANOID(!rx_buf->skb);
EFX_BUG_ON_PARANOID(!checksummed);
napi_gro_receive(napi, rx_buf->skb);
gro_result = napi_gro_receive(napi, rx_buf->skb);
rx_buf->skb = NULL;
}
if (gro_result == GRO_NORMAL) {
channel->rx_alloc_level += RX_ALLOC_FACTOR_SKB;
} else if (gro_result != GRO_DROP) {
channel->rx_alloc_level += RX_ALLOC_FACTOR_LRO;
channel->irq_mod_score += 2;
}
}
void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,