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authorFlorian Westphal <fw@strlen.de>2021-09-24 14:12:38 -0700
committerDavid S. Miller <davem@davemloft.net>2021-09-25 11:36:51 +0100
commit3241a9c029344ca4aa0ef1fa9f0f010d5bbc2a85 (patch)
tree59780baad706022b3297c1f3a4594d15ed6f5a5b /net/mptcp
parent9e65b6a5aaa3236488b4f4e3e8b914d73124a5a5 (diff)
mptcp: re-arm retransmit timer if data is pending
The retransmit head will be NULL in case there is no in-flight data (meaning all data injected into network has been acked). In that case the retransmit timer is stopped. This is only correct if there is no more pending, not-yet-sent data. If there is, the retransmit timer needs to set the PENDING bit again so that mptcp tries to send the remaining (new) data once a subflow can accept more data. Also, mptcp_subflow_get_retrans() has to be called unconditionally. This function checks for subflows that have become unresponsive and marks them as stale, so in the case where the rtx queue is empty, subflows will never be marked stale which prevents available backup subflows from becoming eligible for transmit. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/226 Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp')
-rw-r--r--net/mptcp/protocol.c21
1 files changed, 18 insertions, 3 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 5b0ed64c5cd2..8029bbbe1c9e 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1105,7 +1105,8 @@ out:
if (cleaned && tcp_under_memory_pressure(sk))
__mptcp_mem_reclaim_partial(sk);
- if (snd_una == READ_ONCE(msk->snd_nxt) && !msk->recovery) {
+ if (snd_una == READ_ONCE(msk->snd_nxt) &&
+ snd_una == READ_ONCE(msk->write_seq)) {
if (mptcp_timer_pending(sk) && !mptcp_data_fin_enabled(msk))
mptcp_stop_timer(sk);
} else {
@@ -1547,6 +1548,13 @@ static void mptcp_update_post_push(struct mptcp_sock *msk,
msk->snd_nxt = snd_nxt_new;
}
+static void mptcp_check_and_set_pending(struct sock *sk)
+{
+ if (mptcp_send_head(sk) &&
+ !test_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags))
+ set_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags);
+}
+
void __mptcp_push_pending(struct sock *sk, unsigned int flags)
{
struct sock *prev_ssk = NULL, *ssk = NULL;
@@ -2414,6 +2422,9 @@ static void __mptcp_retrans(struct sock *sk)
int ret;
mptcp_clean_una_wakeup(sk);
+
+ /* first check ssk: need to kick "stale" logic */
+ ssk = mptcp_subflow_get_retrans(msk);
dfrag = mptcp_rtx_head(sk);
if (!dfrag) {
if (mptcp_data_fin_enabled(msk)) {
@@ -2426,10 +2437,12 @@ static void __mptcp_retrans(struct sock *sk)
goto reset_timer;
}
- return;
+ if (!mptcp_send_head(sk))
+ return;
+
+ goto reset_timer;
}
- ssk = mptcp_subflow_get_retrans(msk);
if (!ssk)
goto reset_timer;
@@ -2456,6 +2469,8 @@ static void __mptcp_retrans(struct sock *sk)
release_sock(ssk);
reset_timer:
+ mptcp_check_and_set_pending(sk);
+
if (!mptcp_timer_pending(sk))
mptcp_reset_timer(sk);
}