From 4e485d06bb8c7811a0d69a811c77befd54b9ab0c Mon Sep 17 00:00:00 2001 From: Vakul Garg Date: Sat, 30 Jun 2018 00:45:55 +0530 Subject: 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 Suggested-by: Boris Pismenny Signed-off-by: David S. Miller --- net/strparser/strparser.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) (limited to 'net/strparser') diff --git a/net/strparser/strparser.c b/net/strparser/strparser.c index 373836615c57..4f40a90ca016 100644 --- a/net/strparser/strparser.c +++ b/net/strparser/strparser.c @@ -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); -- cgit v1.2.3-59-g8ed1b