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authorFlorian Westphal <fw@strlen.de>2020-05-16 10:46:20 +0200
committerDavid S. Miller <davem@davemloft.net>2020-05-17 12:35:34 -0700
commit149f7c71e2c710a8ced836421a631953c9f84aa3 (patch)
treec93d9ef2919afeee41972fe3c9afdb6cfac30c09 /net/mptcp
parent72511aab95c94d7c0f03d0b7db5df47fdca059f6 (diff)
downloadlinux-149f7c71e2c710a8ced836421a631953c9f84aa3.tar.bz2
mptcp: fill skb extension cache outside of mptcp_sendmsg_frag
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 a preparation patch that makes sure we call mptcp_sendmsg_frag only if a skb extension has been allocated. Moreover, such allocation currently uses GFP_ATOMIC while it could use sleeping allocation instead. Followup patches will remove the wait loop from mptcp_sendmsg_frag() and will allow to do a sleeping allocation for the extension. Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp')
-rw-r--r--net/mptcp/protocol.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index e97357066b21..1bdfbca1c23a 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -669,6 +669,9 @@ static struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk)
sock_owned_by_me((const struct sock *)msk);
+ if (!mptcp_ext_cache_refill(msk))
+ return NULL;
+
mptcp_for_each_subflow(msk, subflow) {
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
@@ -804,7 +807,8 @@ wait_for_sndbuf:
if (!tx_ok)
break;
- if (!sk_stream_memory_free(ssk)) {
+ if (!sk_stream_memory_free(ssk) ||
+ !mptcp_ext_cache_refill(msk)) {
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
tcp_push(ssk, msg->msg_flags, mss_now,
tcp_sk(ssk)->nonagle, size_goal);
@@ -1158,7 +1162,7 @@ static void mptcp_worker(struct work_struct *work)
{
struct mptcp_sock *msk = container_of(work, struct mptcp_sock, work);
struct sock *ssk, *sk = &msk->sk.icsk_inet.sk;
- int orig_len, orig_offset, ret, mss_now = 0, size_goal = 0;
+ int orig_len, orig_offset, mss_now = 0, size_goal = 0;
struct mptcp_data_frag *dfrag;
u64 orig_write_seq;
size_t copied = 0;
@@ -1180,6 +1184,9 @@ static void mptcp_worker(struct work_struct *work)
if (!dfrag)
goto unlock;
+ if (!mptcp_ext_cache_refill(msk))
+ goto reset_unlock;
+
ssk = mptcp_subflow_get_retrans(msk);
if (!ssk)
goto reset_unlock;
@@ -1191,8 +1198,8 @@ static void mptcp_worker(struct work_struct *work)
orig_offset = dfrag->offset;
orig_write_seq = dfrag->data_seq;
while (dfrag->data_len > 0) {
- ret = mptcp_sendmsg_frag(sk, ssk, &msg, dfrag, &timeo, &mss_now,
- &size_goal);
+ int ret = mptcp_sendmsg_frag(sk, ssk, &msg, dfrag, &timeo,
+ &mss_now, &size_goal);
if (ret < 0)
break;
@@ -1200,6 +1207,9 @@ static void mptcp_worker(struct work_struct *work)
copied += ret;
dfrag->data_len -= ret;
dfrag->offset += ret;
+
+ if (!mptcp_ext_cache_refill(msk))
+ break;
}
if (copied)
tcp_push(ssk, msg.msg_flags, mss_now, tcp_sk(ssk)->nonagle,