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RDS: TCP: Call pskb_extract() helper function 

rds-stress experiments with request size 256 bytes, 8K acks,
using 16 threads show a 40% improvment when pskb_extract()
replaces the {skb_clone(..); pskb_pull(..); pskb_trim(..);}
pattern in the Rx path, so we leverage the perf gain with
this commit.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
steinar/wifi_calib_4_9_kernel
Sowmini Varadhan 2016-04-22 18:36:36 -07:00 committed by David S. Miller
parent 6fa01ccd88
commit 947d2756cd
1 changed files with 3 additions and 11 deletions
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14
net/rds/tcp_recv.c
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@ -207,22 +207,14 @@ static int rds_tcp_data_recv(read_descriptor_t *desc, struct sk_buff *skb,
}
if (left && tc->t_tinc_data_rem) {
clone = skb_clone(skb, arg->gfp);
to_copy = min(tc->t_tinc_data_rem, left);
clone = pskb_extract(skb, offset, to_copy, arg->gfp);
if (!clone) {
desc->error = -ENOMEM;
goto out;
}
to_copy = min(tc->t_tinc_data_rem, left);
if (!pskb_pull(clone, offset) ||
pskb_trim(clone, to_copy)) {
pr_warn("rds_tcp_data_recv: pull/trim failed "
"left %zu data_rem %zu skb_len %d\n",
left, tc->t_tinc_data_rem, skb->len);
kfree_skb(clone);
desc->error = -ENOMEM;
goto out;
}
skb_queue_tail(&tinc->ti_skb_list, clone);
rdsdebug("skb %p data %p len %d off %u to_copy %zu -> "