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mptcp: use get_send wrapper

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This patch adds the multiple subflows support for __mptcp_push_pending
and __mptcp_subflow_push_pending. Use get_send() wrapper instead of
mptcp_subflow_get_send() in them.

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_send() wrapper from
mptcp_subflow_get_send().

This commit allows the scheduler to set the subflow->scheduled bit in
multiple subflows, but it does not allow for sending redundant data.
Multiple scheduled subflows will send sequential data on each subflow.

Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <martineau@kernel.org>
Link: https://lore.kernel.org/r/20230821-upstream-net-next-20230818-v1-8-0c860fb256a8@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Geliang Tang 2023-08-21 15:25:19 -07:00 committed by Jakub Kicinski
parent 07336a87fe
commit 0fa1b3783a
2 changed files with 82 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

115
net/mptcp/protocol.c
View File

@ -1377,15 +1377,6 @@ struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk)
u64 linger_time;
long tout = 0;
msk_owned_by_me(msk);
if (__mptcp_check_fallback(msk)) {
if (!msk->first)
return NULL;
return __tcp_can_send(msk->first) &&
sk_stream_memory_free(msk->first) ? msk->first : NULL;
}
/* pick the subflow with the lower wmem/wspace ratio */
for (i = 0; i < SSK_MODE_MAX; ++i) {
send_info[i].ssk = NULL;
@ -1538,43 +1529,56 @@ void __mptcp_push_pending(struct sock *sk, unsigned int flags)
.flags = flags,
};
bool do_check_data_fin = false;
int push_count = 1;
while (mptcp_send_head(sk)) {
while (mptcp_send_head(sk) && (push_count > 0)) {
struct mptcp_subflow_context *subflow;
int ret = 0;
prev_ssk = ssk;
ssk = mptcp_subflow_get_send(msk);
if (mptcp_sched_get_send(msk))
break;
/* First check. If the ssk has changed since
* the last round, release prev_ssk
*/
if (ssk != prev_ssk && prev_ssk)
mptcp_push_release(prev_ssk, &info);
if (!ssk)
goto out;
push_count = 0;
/* Need to lock the new subflow only if different
* from the previous one, otherwise we are still
* helding the relevant lock
*/
if (ssk != prev_ssk)
lock_sock(ssk);
mptcp_for_each_subflow(msk, subflow) {
if (READ_ONCE(subflow->scheduled)) {
mptcp_subflow_set_scheduled(subflow, false);
ret = __subflow_push_pending(sk, ssk, &info);
if (ret <= 0) {
if (ret == -EAGAIN)
continue;
mptcp_push_release(ssk, &info);
goto out;
prev_ssk = ssk;
ssk = mptcp_subflow_tcp_sock(subflow);
if (ssk != prev_ssk) {
/* First check. If the ssk has changed since
* the last round, release prev_ssk
*/
if (prev_ssk)
mptcp_push_release(prev_ssk, &info);
/* Need to lock the new subflow only if different
* from the previous one, otherwise we are still
* helding the relevant lock
*/
lock_sock(ssk);
}
push_count++;
ret = __subflow_push_pending(sk, ssk, &info);
if (ret <= 0) {
if (ret != -EAGAIN ||
(1 << ssk->sk_state) &
(TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSE))
push_count--;
continue;
}
do_check_data_fin = true;
}
}
do_check_data_fin = true;
}
/* at this point we held the socket lock for the last subflow we used */
if (ssk)
mptcp_push_release(ssk, &info);
out:
/* ensure the rtx timer is running */
if (!mptcp_timer_pending(sk))
mptcp_reset_timer(sk);
@ -1588,30 +1592,49 @@ static void __mptcp_subflow_push_pending(struct sock *sk, struct sock *ssk, bool
struct mptcp_sendmsg_info info = {
.data_lock_held = true,
};
bool keep_pushing = true;
struct sock *xmit_ssk;
int copied = 0;
info.flags = 0;
while (mptcp_send_head(sk)) {
while (mptcp_send_head(sk) && keep_pushing) {
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
int ret = 0;
/* check for a different subflow usage only after
* spooling the first chunk of data
*/
xmit_ssk = first ? ssk : mptcp_subflow_get_send(msk);
if (!xmit_ssk)
goto out;
if (xmit_ssk != ssk) {
mptcp_subflow_delegate(mptcp_subflow_ctx(xmit_ssk),
MPTCP_DELEGATE_SEND);
goto out;
if (first) {
mptcp_subflow_set_scheduled(subflow, false);
ret = __subflow_push_pending(sk, ssk, &info);
first = false;
if (ret <= 0)
break;
copied += ret;
continue;
}
ret = __subflow_push_pending(sk, ssk, &info);
first = false;
if (ret <= 0)
break;
copied += ret;
if (mptcp_sched_get_send(msk))
goto out;
if (READ_ONCE(subflow->scheduled)) {
mptcp_subflow_set_scheduled(subflow, false);
ret = __subflow_push_pending(sk, ssk, &info);
if (ret <= 0)
keep_pushing = false;
copied += ret;
}
mptcp_for_each_subflow(msk, subflow) {
if (READ_ONCE(subflow->scheduled)) {
xmit_ssk = mptcp_subflow_tcp_sock(subflow);
if (xmit_ssk != ssk) {
mptcp_subflow_delegate(subflow,
MPTCP_DELEGATE_SEND);
keep_pushing = false;
}
}
}
}
out:

13
net/mptcp/sched.c
View File

@ -99,6 +99,19 @@ int mptcp_sched_get_send(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_send */
if (__mptcp_check_fallback(msk)) {
if (msk->first &&
__tcp_can_send(msk->first) &&
sk_stream_memory_free(msk->first)) {
mptcp_subflow_set_scheduled(mptcp_subflow_ctx(msk->first), true);
return 0;
}
return -EINVAL;
}
mptcp_for_each_subflow(msk, subflow) {
if (READ_ONCE(subflow->scheduled))
return 0;