[PATCH V2 net-next 1/2] tcp: send in-queue bytes in cmsg upon read

[Soheil Hassas Yeganeh <soheil.kdev@gmail.com>]

From: Soheil Hassas Yeganeh <soheil@google.com>

Applications with many concurrent connections, high variance
in receive queue length and tight memory bounds cannot
allocate worst-case buffer size to drain sockets. Knowing
the size of receive queue length, applications can optimize
how they allocate buffers to read from the socket.

The number of bytes pending on the socket is directly
available through ioctl(FIONREAD/SIOCINQ) and can be
approximated using getsockopt(MEMINFO) (rmem_alloc includes
skb overheads in addition to application data). But, both of
these options add an extra syscall per recvmsg. Moreover,
ioctl(FIONREAD/SIOCINQ) takes the socket lock.

Add the TCP_INQ socket option to TCP. When this socket
option is set, recvmsg() relays the number of bytes available
on the socket for reading to the application via the
TCP_CM_INQ control message.

Calculate the number of bytes after releasing the socket lock
to include the processed backlog, if any. To avoid an extra
branch in the hot path of recvmsg() for this new control
message, move all cmsg processing inside an existing branch for
processing receive timestamps. Since the socket lock is not held
when calculating the size of receive queue, TCP_INQ is a hint.
For example, it can overestimate the queue size by one byte,
if FIN is received.

With this method, applications can start reading from the socket
using a small buffer, and then use larger buffers based on the
remaining data when needed.

Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
---
 include/linux/tcp.h      |  2 +-
 include/net/tcp.h        |  8 ++++++++
 include/uapi/linux/tcp.h |  3 +++
 net/ipv4/tcp.c           | 27 +++++++++++++++++++++++----
 4 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 20585d5c4e1c3..807776928cb86 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -228,7 +228,7 @@ struct tcp_sock {
 		unused:2;
 	u8	nonagle     : 4,/* Disable Nagle algorithm?             */
 		thin_lto    : 1,/* Use linear timeouts for thin streams */
-		unused1	    : 1,
+		recvmsg_inq : 1,/* Indicate # of bytes in queue upon recvmsg */
 		repair      : 1,
 		frto        : 1;/* F-RTO (RFC5682) activated in CA_Loss */
 	u8	repair_queue;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 833154e3df173..0986836b5df5b 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1951,6 +1951,14 @@ static inline int tcp_inq(struct sock *sk)
 	return answ;
 }
 
+static inline int tcp_inq_hint(const struct sock *sk)
+{
+	const struct tcp_sock *tp = tcp_sk(sk);
+
+	return max_t(int, 0,
+		     READ_ONCE(tp->rcv_nxt) - READ_ONCE(tp->copied_seq));
+}
+
 int tcp_peek_len(struct socket *sock);
 
 static inline void tcp_segs_in(struct tcp_sock *tp, const struct sk_buff *skb)
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 379b08700a542..d4cdd25a7bd48 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -122,6 +122,9 @@ enum {
 #define TCP_MD5SIG_EXT		32	/* TCP MD5 Signature with extensions */
 #define TCP_FASTOPEN_KEY	33	/* Set the key for Fast Open (cookie) */
 #define TCP_FASTOPEN_NO_COOKIE	34	/* Enable TFO without a TFO cookie */
+#define TCP_INQ			35	/* Notify bytes available to read as a cmsg on read */
+
+#define TCP_CM_INQ		TCP_INQ
 
 struct tcp_repair_opt {
 	__u32	opt_code;
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index dfd090ea54ad4..5a7056980f730 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1910,13 +1910,14 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
 	u32 peek_seq;
 	u32 *seq;
 	unsigned long used;
-	int err;
+	int err, inq;
 	int target;		/* Read at least this many bytes */
 	long timeo;
 	struct sk_buff *skb, *last;
 	u32 urg_hole = 0;
 	struct scm_timestamping tss;
 	bool has_tss = false;
+	bool has_cmsg;
 
 	if (unlikely(flags & MSG_ERRQUEUE))
 		return inet_recv_error(sk, msg, len, addr_len);
@@ -1931,6 +1932,7 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
 	if (sk->sk_state == TCP_LISTEN)
 		goto out;
 
+	has_cmsg = tp->recvmsg_inq;
 	timeo = sock_rcvtimeo(sk, nonblock);
 
 	/* Urgent data needs to be handled specially. */
@@ -2117,6 +2119,7 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
 		if (TCP_SKB_CB(skb)->has_rxtstamp) {
 			tcp_update_recv_tstamps(skb, &tss);
 			has_tss = true;
+			has_cmsg = true;
 		}
 		if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)
 			goto found_fin_ok;
@@ -2136,13 +2139,20 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
 	 * on connected socket. I was just happy when found this 8) --ANK
 	 */
 
-	if (has_tss)
-		tcp_recv_timestamp(msg, sk, &tss);
-
 	/* Clean up data we have read: This will do ACK frames. */
 	tcp_cleanup_rbuf(sk, copied);
 
 	release_sock(sk);
+
+	if (has_cmsg) {
+		if (has_tss)
+			tcp_recv_timestamp(msg, sk, &tss);
+		if (tp->recvmsg_inq) {
+			inq = tcp_inq_hint(sk);
+			put_cmsg(msg, SOL_TCP, TCP_CM_INQ, sizeof(inq), &inq);
+		}
+	}
+
 	return copied;
 
 out:
@@ -3011,6 +3021,12 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 		tp->notsent_lowat = val;
 		sk->sk_write_space(sk);
 		break;
+	case TCP_INQ:
+		if (val > 1 || val < 0)
+			err = -EINVAL;
+		else
+			tp->recvmsg_inq = val;
+		break;
 	default:
 		err = -ENOPROTOOPT;
 		break;
@@ -3436,6 +3452,9 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
 	case TCP_NOTSENT_LOWAT:
 		val = tp->notsent_lowat;
 		break;
+	case TCP_INQ:
+		val = tp->recvmsg_inq;
+		break;
 	case TCP_SAVE_SYN:
 		val = tp->save_syn;
 		break;
-- 
2.17.0.441.gb46fe60e1d-goog