tcp: Make use of MSG_EOR in tcp_sendmsg

This patch adds an eor bit to the TCP_SKB_CB.  When MSG_EOR
is passed to tcp_sendmsg, the eor bit will be set at the skb
containing the last byte of the userland's msg.  The eor bit
will prevent data from appending to that skb in the future.

The change in do_tcp_sendpages is to honor the eor set
during the previous tcp_sendmsg(MSG_EOR) call.

This patch handles the tcp_sendmsg case.  The followup patches
will handle other skb coalescing and fragment cases.

One potential use case is to use MSG_EOR with
SOF_TIMESTAMPING_TX_ACK to get a more accurate
TCP ack timestamping on application protocol with
multiple outgoing response messages (e.g. HTTP2).

Packetdrill script for testing:
~~~~~~
+0 `sysctl -q -w net.ipv4.tcp_min_tso_segs=10`
+0 `sysctl -q -w net.ipv4.tcp_no_metrics_save=1`
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0

0.100 < S 0:0(0) win 32792 <mss 1460,sackOK,nop,nop,nop,wscale 7>
0.100 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 7>
0.200 < . 1:1(0) ack 1 win 257
0.200 accept(3, ..., ...) = 4
+0 setsockopt(4, SOL_TCP, TCP_NODELAY, [1], 4) = 0

0.200 write(4, ..., 14600) = 14600
0.200 sendto(4, ..., 730, MSG_EOR, ..., ...) = 730
0.200 sendto(4, ..., 730, MSG_EOR, ..., ...) = 730

0.200 > .  1:7301(7300) ack 1
0.200 > P. 7301:14601(7300) ack 1

0.300 < . 1:1(0) ack 14601 win 257
0.300 > P. 14601:15331(730) ack 1
0.300 > P. 15331:16061(730) ack 1

0.400 < . 1:1(0) ack 16061 win 257
0.400 close(4) = 0
0.400 > F. 16061:16061(0) ack 1
0.400 < F. 1:1(0) ack 16062 win 257
0.400 > . 16062:16062(0) ack 2

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Suggested-by: Eric Dumazet <edumazet@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 2 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 91993782a947..cb4d1cabb42c 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -909,7 +909,8 @@ static ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset,
                 int copy, i;
                 bool can_coalesce;
 
-                if (!tcp_send_head(sk) || (copy = size_goal - skb->len) <= 0) {
+                if (!tcp_send_head(sk) || (copy = size_goal - skb->len) <= 0 ||
+                    !tcp_skb_can_collapse_to(skb)) {
 new_segment:
                         if (!sk_stream_memory_free(sk))
                                 goto wait_for_sndbuf;
@@ -1157,7 +1158,7 @@ int tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
                         copy = max - skb->len;
                 }
 
-                if (copy <= 0) {
+                if (copy <= 0 || !tcp_skb_can_collapse_to(skb)) {
 new_segment:
                         /* Allocate new segment. If the interface is SG,
                          * allocate skb fitting to single page.
@@ -1251,6 +1252,8 @@ new_segment:
                 copied += copy;
                 if (!msg_data_left(msg)) {
                         tcp_tx_timestamp(sk, sockc.tsflags, skb);
+                        if (unlikely(flags & MSG_EOR))
+                                TCP_SKB_CB(skb)->eor = 1;
                         goto out;
                 }