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>

net/strparser/strparser.c

@@ -155,12 +155,14 @@ 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.
 			 */
+			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)) {
 				/* We can't append to an sk_buff that already
@@ -216,15 +218,17 @@ 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.
 			 */
+			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);
 			*strp->skb_nextp = skb;