system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-09-06 18:01:05 +00:00
Code Issues Packages Projects Releases Wiki Activity

mptcp: refactor sndbuf auto-tuning

Browse source 
The MPTCP protocol account for the data enqueued on all the subflows
to the main socket send buffer, while the send buffer auto-tuning
algorithm set the main socket send buffer size as the max size among
the subflows.

That causes bad performances when at least one subflow is sndbuf
limited, e.g. due to very high latency, as the MPTCP scheduler can't
even fill such buffer.

Change the send-buffer auto-tuning algorithm to compute the main socket
send buffer size as the sum of all the subflows buffer size.

Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <martineau@kernel.org>
Link: https://lore.kernel.org/r/20231023-send-net-next-20231023-2-v1-9-9dc60939d371@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2023-10-23 13:44:42 -07:00 committed by Jakub Kicinski
parent 9fdc779331
commit 8005184fd1
4 changed files with 70 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
net/mptcp/protocol.c
View file

@ -890,6 +890,7 @@ static bool __mptcp_finish_join(struct mptcp_sock *msk, struct sock *ssk)
mptcp_sockopt_sync_locked(msk, ssk);
mptcp_subflow_joined(msk, ssk);
mptcp_stop_tout_timer(sk);
__mptcp_propagate_sndbuf(sk, ssk);
return true;
}
@ -1076,15 +1077,16 @@ static void mptcp_enter_memory_pressure(struct sock *sk)
struct mptcp_sock *msk = mptcp_sk(sk);
bool first = true;
sk_stream_moderate_sndbuf(sk);
mptcp_for_each_subflow(msk, subflow) {
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
if (first)
tcp_enter_memory_pressure(ssk);
sk_stream_moderate_sndbuf(ssk);
first = false;
}
__mptcp_sync_sndbuf(sk);
}
/* ensure we get enough memory for the frag hdr, beyond some minimal amount of
@ -2458,6 +2460,7 @@ static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
WRITE_ONCE(msk->first, NULL);
out:
__mptcp_sync_sndbuf(sk);
if (need_push)
__mptcp_push_pending(sk, 0);
@ -3224,7 +3227,7 @@ struct sock *mptcp_sk_clone_init(const struct sock *sk,
* uses the correct data
*/
mptcp_copy_inaddrs(nsk, ssk);
mptcp_propagate_sndbuf(nsk, ssk);
__mptcp_propagate_sndbuf(nsk, ssk);
mptcp_rcv_space_init(msk, ssk);
bh_unlock_sock(nsk);
@ -3402,6 +3405,8 @@ static void mptcp_release_cb(struct sock *sk)
__mptcp_set_connected(sk);
if (__test_and_clear_bit(MPTCP_ERROR_REPORT, &msk->cb_flags))
__mptcp_error_report(sk);
if (__test_and_clear_bit(MPTCP_SYNC_SNDBUF, &msk->cb_flags))
__mptcp_sync_sndbuf(sk);
}
__mptcp_update_rmem(sk);
@ -3446,6 +3451,14 @@ void mptcp_subflow_process_delegated(struct sock *ssk, long status)
__set_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->cb_flags);
mptcp_data_unlock(sk);
}
if (status & BIT(MPTCP_DELEGATE_SNDBUF)) {
mptcp_data_lock(sk);
if (!sock_owned_by_user(sk))
__mptcp_sync_sndbuf(sk);
else
__set_bit(MPTCP_SYNC_SNDBUF, &mptcp_sk(sk)->cb_flags);
mptcp_data_unlock(sk);
}
if (status & BIT(MPTCP_DELEGATE_ACK))
schedule_3rdack_retransmission(ssk);
}
@ -3530,6 +3543,7 @@ bool mptcp_finish_join(struct sock *ssk)
/* active subflow, already present inside the conn_list */
if (!list_empty(&subflow->node)) {
mptcp_subflow_joined(msk, ssk);
mptcp_propagate_sndbuf(parent, ssk);
return true;
}

54
net/mptcp/protocol.h
View file

@ -125,6 +125,7 @@
#define MPTCP_RETRANSMIT 4
#define MPTCP_FLUSH_JOIN_LIST 5
#define MPTCP_CONNECTED 6
#define MPTCP_SYNC_SNDBUF 7
struct mptcp_skb_cb {
u64 map_seq;
@ -445,6 +446,7 @@ DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
#define MPTCP_DELEGATE_SCHEDULED 0
#define MPTCP_DELEGATE_SEND 1
#define MPTCP_DELEGATE_ACK 2
#define MPTCP_DELEGATE_SNDBUF 3
#define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED))
/* MPTCP subflow context */
@ -518,6 +520,9 @@ struct mptcp_subflow_context {
u32 setsockopt_seq;
u32 stale_rcv_tstamp;
int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf,
* protected by the msk socket lock
*/
struct sock *tcp_sock; /* tcp sk backpointer */
struct sock *conn; /* parent mptcp_sock */
@ -780,13 +785,52 @@ static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
}
static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
static inline void __mptcp_sync_sndbuf(struct sock *sk)
{
if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
return false;
struct mptcp_subflow_context *subflow;
int ssk_sndbuf, new_sndbuf;
WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
return true;
if (sk->sk_userlocks & SOCK_SNDBUF_LOCK)
return;
new_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[0];
mptcp_for_each_subflow(mptcp_sk(sk), subflow) {
ssk_sndbuf = READ_ONCE(mptcp_subflow_tcp_sock(subflow)->sk_sndbuf);
subflow->cached_sndbuf = ssk_sndbuf;
new_sndbuf += ssk_sndbuf;
}
/* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */
WRITE_ONCE(sk->sk_sndbuf, new_sndbuf);
}
/* The called held both the msk socket and the subflow socket locks,
* possibly under BH
*/
static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf)
__mptcp_sync_sndbuf(sk);
}
/* the caller held only the subflow socket lock, either in process or
* BH context. Additionally this can be called under the msk data lock,
* so we can't acquire such lock here: let the delegate action acquires
* the needed locks in suitable order.
*/
static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf))
return;
local_bh_disable();
mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF);
local_bh_enable();
}
static inline void mptcp_write_space(struct sock *sk)

5
net/mptcp/sockopt.c
View file

@ -95,6 +95,7 @@ static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, in
case SO_SNDBUFFORCE:
ssk->sk_userlocks |= SOCK_SNDBUF_LOCK;
WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf);
mptcp_subflow_ctx(ssk)->cached_sndbuf = sk->sk_sndbuf;
break;
case SO_RCVBUF:
case SO_RCVBUFFORCE:
@ -1415,8 +1416,10 @@ static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk)
if (sk->sk_userlocks & tx_rx_locks) {
ssk->sk_userlocks |= sk->sk_userlocks & tx_rx_locks;
if (sk->sk_userlocks & SOCK_SNDBUF_LOCK)
if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) {
WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf);
mptcp_subflow_ctx(ssk)->cached_sndbuf = sk->sk_sndbuf;
}
if (sk->sk_userlocks & SOCK_RCVBUF_LOCK)
WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf);
}

3
net/mptcp/subflow.c
View file

@ -421,6 +421,7 @@ static bool subflow_use_different_dport(struct mptcp_sock *msk, const struct soc
void __mptcp_set_connected(struct sock *sk)
{
__mptcp_propagate_sndbuf(sk, mptcp_sk(sk)->first);
if (sk->sk_state == TCP_SYN_SENT) {
inet_sk_state_store(sk, TCP_ESTABLISHED);
sk->sk_state_change(sk);
@ -472,7 +473,6 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
return;
msk = mptcp_sk(parent);
mptcp_propagate_sndbuf(parent, sk);
subflow->rel_write_seq = 1;
subflow->conn_finished = 1;
subflow->ssn_offset = TCP_SKB_CB(skb)->seq;
@ -1736,7 +1736,6 @@ static void subflow_state_change(struct sock *sk)
msk = mptcp_sk(parent);
if (subflow_simultaneous_connect(sk)) {
mptcp_propagate_sndbuf(parent, sk);
mptcp_do_fallback(sk);
mptcp_rcv_space_init(msk, sk);
pr_fallback(msk);