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>
diff --git a/net/strparser/strparser.c b/net/strparser/strparser.c
index 37383661..4f40a90 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);