From: Geliang Tang <geliang.tang@suse.com>
This patch adds the multiple subflows support for __mptcp_retrans(). Use
get_retrans() wrapper instead of mptcp_subflow_get_retrans() in it.
Check the subflow scheduled flags to test which subflow or subflows are
picked by the scheduler, use them to send data.
Move msk_owned_by_me() and fallback checks into get_retrans() wrapper
from mptcp_subflow_get_retrans().
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <martineau@kernel.org>
---
net/mptcp/protocol.c | 65 ++++++++++++++++++++++++++++++----------------------
net/mptcp/sched.c | 6 +++++
2 files changed, 43 insertions(+), 28 deletions(-)
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 77e94ee82859..61590ff2b9ee 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2233,11 +2233,6 @@ struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk)
struct mptcp_subflow_context *subflow;
int min_stale_count = INT_MAX;
- msk_owned_by_me(msk);
-
- if (__mptcp_check_fallback(msk))
- return NULL;
-
mptcp_for_each_subflow(msk, subflow) {
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
@@ -2515,16 +2510,17 @@ static void mptcp_check_fastclose(struct mptcp_sock *msk)
static void __mptcp_retrans(struct sock *sk)
{
struct mptcp_sock *msk = mptcp_sk(sk);
+ struct mptcp_subflow_context *subflow;
struct mptcp_sendmsg_info info = {};
struct mptcp_data_frag *dfrag;
- size_t copied = 0;
struct sock *ssk;
- int ret;
+ int ret, err;
+ u16 len = 0;
mptcp_clean_una_wakeup(sk);
/* first check ssk: need to kick "stale" logic */
- ssk = mptcp_subflow_get_retrans(msk);
+ err = mptcp_sched_get_retrans(msk);
dfrag = mptcp_rtx_head(sk);
if (!dfrag) {
if (mptcp_data_fin_enabled(msk)) {
@@ -2543,32 +2539,45 @@ static void __mptcp_retrans(struct sock *sk)
goto reset_timer;
}
- if (!ssk)
+ if (err)
goto reset_timer;
- lock_sock(ssk);
+ mptcp_for_each_subflow(msk, subflow) {
+ if (READ_ONCE(subflow->scheduled)) {
+ u16 copied = 0;
- /* limit retransmission to the bytes already sent on some subflows */
- info.sent = 0;
- info.limit = READ_ONCE(msk->csum_enabled) ? dfrag->data_len : dfrag->already_sent;
- while (info.sent < info.limit) {
- ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info);
- if (ret <= 0)
- break;
+ mptcp_subflow_set_scheduled(subflow, false);
- MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RETRANSSEGS);
- copied += ret;
- info.sent += ret;
- }
- if (copied) {
- dfrag->already_sent = max(dfrag->already_sent, info.sent);
- msk->bytes_retrans += copied;
- tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle,
- info.size_goal);
- WRITE_ONCE(msk->allow_infinite_fallback, false);
+ ssk = mptcp_subflow_tcp_sock(subflow);
+
+ lock_sock(ssk);
+
+ /* limit retransmission to the bytes already sent on some subflows */
+ info.sent = 0;
+ info.limit = READ_ONCE(msk->csum_enabled) ? dfrag->data_len :
+ dfrag->already_sent;
+ while (info.sent < info.limit) {
+ ret = mptcp_sendmsg_frag(sk, ssk, dfrag, &info);
+ if (ret <= 0)
+ break;
+
+ MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RETRANSSEGS);
+ copied += ret;
+ info.sent += ret;
+ }
+ if (copied) {
+ len = max(copied, len);
+ tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle,
+ info.size_goal);
+ WRITE_ONCE(msk->allow_infinite_fallback, false);
+ }
+
+ release_sock(ssk);
+ }
}
- release_sock(ssk);
+ msk->bytes_retrans += len;
+ dfrag->already_sent = max(dfrag->already_sent, len);
reset_timer:
mptcp_check_and_set_pending(sk);
diff --git a/net/mptcp/sched.c b/net/mptcp/sched.c
index 078b5d44978d..cac1cc1fa3b0 100644
--- a/net/mptcp/sched.c
+++ b/net/mptcp/sched.c
@@ -136,6 +136,12 @@ int mptcp_sched_get_retrans(struct mptcp_sock *msk)
struct mptcp_subflow_context *subflow;
struct mptcp_sched_data data;
+ msk_owned_by_me(msk);
+
+ /* the following check is moved out of mptcp_subflow_get_retrans */
+ if (__mptcp_check_fallback(msk))
+ return -EINVAL;
+
mptcp_for_each_subflow(msk, subflow) {
if (READ_ONCE(subflow->scheduled))
return 0;
--
2.41.0