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mptcp: less aggressive retransmission strategy

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The current mptcp re-inject strategy is very aggressive,
we have mptcp-level retransmissions even on single subflow
connection, if the link in-use is lossy.

Let's be a little more conservative: we do retransmit
only if at least a subflow has write and rtx queue empty.

Additionally use the backup subflows only if the active
subflows are stale - no progresses in at least an rtx period
and ignore stale subflows for rtx timeout update

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/207
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-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
2021-08-13 15:15:42 -07:00
committed by David S. Miller
parent 33d41c9cd7
commit 71b7dec27f
3 changed files with 37 additions and 10 deletions
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5
net/mptcp/protocol.h
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@@ -439,11 +439,13 @@ struct mptcp_subflow_context {
u8 reset_seen:1;
u8 reset_transient:1;
u8 reset_reason:4;
u8 stale_count;
long delegated_status;
struct list_head delegated_node; /* link into delegated_action, protected by local BH */
u32 setsockopt_seq;
u32 setsockopt_seq;
u32 stale_rcv_tstamp;
struct sock *tcp_sock; /* tcp sk backpointer */
struct sock *conn; /* parent mptcp_sock */
@@ -690,6 +692,7 @@ void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
void __init mptcp_pm_init(void);
void mptcp_pm_data_init(struct mptcp_sock *msk);
void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp);
bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);