The mptcp_sendmsg_frag helper contains a loop that will wait on the
subflow sk.
It seems preferrable to only wait in mptcp_sendmsg() when blocking io is
requested. mptcp_sendmsg already has such a wait loop that is used when
no subflow socket is available for transmission.
This is another preparation patch that makes sure we call
mptcp_sendmsg_frag only if the page frag cache has been refilled.
Followup patch will remove the wait loop from mptcp_sendmsg_frag().
The retransmit worker doesn't need to do this refill as it won't
transmit new mptcp-level data.
Acked-by: Paolo Abeni <pab...@redhat.com>
Signed-off-by: Florian Westphal <f...@strlen.de>
---
net/mptcp/protocol.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 1bdfbca1c23a..a11e51222e59 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -713,6 +713,7 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr
*msg, size_t len)
{
int mss_now = 0, size_goal = 0, ret = 0;
struct mptcp_sock *msk = mptcp_sk(sk);
+ struct page_frag *pfrag;
struct socket *ssock;
size_t copied = 0;
struct sock *ssk;
@@ -741,13 +742,16 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr
*msg, size_t len)
return ret >= 0 ? ret + copied : (copied ? copied : ret);
}
+ pfrag = sk_page_frag(sk);
restart:
mptcp_clean_una(sk);
wait_for_sndbuf:
__mptcp_flush_join_list(msk);
ssk = mptcp_subflow_get_send(msk);
- while (!sk_stream_memory_free(sk) || !ssk) {
+ while (!sk_stream_memory_free(sk) ||
+ !ssk ||
+ !mptcp_page_frag_refill(ssk, pfrag)) {
if (ssk) {
/* make sure retransmit timer is
* running before we wait for memory.
@@ -808,6 +812,7 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr
*msg, size_t len)
break;
if (!sk_stream_memory_free(ssk) ||
+ !mptcp_page_frag_refill(ssk, pfrag) ||
!mptcp_ext_cache_refill(msk)) {
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
tcp_push(ssk, msg->msg_flags, mss_now,
--
2.26.2
