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mptcp: basic sndbuf autotuning

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Let the msk sendbuf track the size of the larger subflow's
send window, so that we ensure mptcp_sendmsg() does not
exceed MPTCP-level send window.

The update is performed just before try to send any data.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2020-09-14 10:01:10 +02:00 committed by David S. Miller
parent 6719331c2f
commit da51aef5fe
1 changed files with 13 additions and 4 deletions
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17
net/mptcp/protocol.c
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@ -856,7 +856,8 @@ static void mptcp_nospace(struct mptcp_sock *msk)
}
}
static struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk)
static struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk,
u32 *sndbuf)
{
struct mptcp_subflow_context *subflow;
struct sock *sk = (struct sock *)msk;
@ -865,6 +866,7 @@ static struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk)
sock_owned_by_me(sk);
*sndbuf = 0;
if (!mptcp_ext_cache_refill(msk))
return NULL;
@ -877,6 +879,7 @@ static struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk)
return NULL;
}
*sndbuf = max(tcp_sk(ssk)->snd_wnd, *sndbuf);
if (subflow->backup) {
if (!backup)
backup = ssk;
@ -903,6 +906,7 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
struct page_frag *pfrag;
size_t copied = 0;
struct sock *ssk;
u32 sndbuf;
bool tx_ok;
long timeo;
@ -929,7 +933,7 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
}
__mptcp_flush_join_list(msk);
ssk = mptcp_subflow_get_send(msk);
ssk = mptcp_subflow_get_send(msk, &sndbuf);
while (!sk_stream_memory_free(sk) ||
!ssk ||
!mptcp_page_frag_refill(ssk, pfrag)) {
@ -953,13 +957,18 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
mptcp_clean_una(sk);
ssk = mptcp_subflow_get_send(msk);
ssk = mptcp_subflow_get_send(msk, &sndbuf);
if (list_empty(&msk->conn_list)) {
ret = -ENOTCONN;
goto out;
}
}
/* do auto tuning */
if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK) &&
sndbuf > READ_ONCE(sk->sk_sndbuf))
WRITE_ONCE(sk->sk_sndbuf, sndbuf);
pr_debug("conn_list->subflow=%p", ssk);
lock_sock(ssk);
@ -1547,7 +1556,7 @@ static int mptcp_init_sock(struct sock *sk)
sk_sockets_allocated_inc(sk);
sk->sk_rcvbuf = sock_net(sk)->ipv4.sysctl_tcp_rmem[1];
sk->sk_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[2];
sk->sk_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[1];
return 0;
}