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strparser: Call skb_unclone conditionally 

Calling skb_unclone() is expensive as it triggers a memcpy operation.
Instead of calling skb_unclone() unconditionally, call it only when skb
has a shared frag_list. This improves tls rx throughout significantly.

Signed-off-by: Vakul Garg <vakul.garg@nxp.com>
Suggested-by: Boris Pismenny <borisp@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vakul Garg 2018-06-30 00:45:55 +05:30 committed by David S. Miller
parent 180390c470
commit 4e485d06bb
1 changed files with 15 additions and 11 deletions
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26
net/strparser/strparser.c
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@ -155,11 +155,13 @@ static int __strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
/* We are going to append to the frags_list of head.
* Need to unshare the frag_list.
*/
err = skb_unclone(head, GFP_ATOMIC);
if (err) {
STRP_STATS_INCR(strp->stats.mem_fail);
desc->error = err;
return 0;
if (skb_has_frag_list(head)) {
err = skb_unclone(head, GFP_ATOMIC);
if (err) {
STRP_STATS_INCR(strp->stats.mem_fail);
desc->error = err;
return 0;
}
}
if (unlikely(skb_shinfo(head)->frag_list)) {
@ -216,14 +218,16 @@ static int __strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
memset(stm, 0, sizeof(*stm));
stm->strp.offset = orig_offset + eaten;
} else {
/* Unclone since we may be appending to an skb that we
/* Unclone if we are appending to an skb that we
* already share a frag_list with.
*/
err = skb_unclone(skb, GFP_ATOMIC);
if (err) {
STRP_STATS_INCR(strp->stats.mem_fail);
desc->error = err;
break;
if (skb_has_frag_list(skb)) {
err = skb_unclone(skb, GFP_ATOMIC);
if (err) {
STRP_STATS_INCR(strp->stats.mem_fail);
desc->error = err;
break;
}
}
stm = _strp_msg(head);