[PATCH net-next 2/4] tcp: push full zerocopy packets

[Willem de Bruijn]

From: Willem de Bruijn <will...@google.com>

Skbs that reach MAX_SKB_FRAGS cannot be extended further. Do the
same for zerocopy frags as non-zerocopy frags and set the PSH bit.
This improves GRO assembly.

Suggested-by: Eric Dumazet <eduma...@google.com>
Signed-off-by: Willem de Bruijn <will...@google.com>
---
 net/ipv4/tcp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 67d39b79c801..44102484a76f 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1371,8 +1371,10 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr 
*msg, size_t size)
                        pfrag->offset += copy;
                } else {
                        err = skb_zerocopy_iter_stream(sk, skb, msg, copy, 
uarg);
-                       if (err == -EMSGSIZE || err == -EEXIST)
+                       if (err == -EMSGSIZE || err == -EEXIST) {
+                               tcp_mark_push(tp, skb);
                                goto new_segment;
+                       }
                        if (err < 0)
                                goto do_error;
                        copy = err;
-- 
2.15.1.620.gb9897f4670-goog