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charset="utf-8" This patch moves the NULL pointer check into mptcp_push_release(). Also add a new parameter 'push' for it to set whether to invoke tcp_push in it. Signed-off-by: Geliang Tang --- net/mptcp/protocol.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index b3e5d30adbe1..2342b9469181 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -1470,9 +1470,17 @@ struct sock *mptcp_subflow_get_send(struct mptcp_soc= k *msk) return ssk; } =20 -static void mptcp_push_release(struct sock *ssk, struct mptcp_sendmsg_info= *info) +static void mptcp_push_release(struct sock *ssk, + struct mptcp_sendmsg_info *info, + bool push) { - tcp_push(ssk, 0, info->mss_now, tcp_sk(ssk)->nonagle, info->size_goal); + if (!ssk) + return; + + if (push) { + tcp_push(ssk, 0, info->mss_now, tcp_sk(ssk)->nonagle, + info->size_goal); + } release_sock(ssk); } =20 @@ -1578,8 +1586,7 @@ void __mptcp_push_pending(struct sock *sk, unsigned i= nt flags) /* First check. 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charset="utf-8" Redundant sends need to work more like the MPTCP retransmit code path. When the scheduler selects multiple subflows, the first subflow to send is a "normal" transmit, and any other subflows would act like a retransmit when accessing the dfrags. Signed-off-by: Geliang Tang --- net/mptcp/protocol.c | 45 ++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 41 insertions(+), 4 deletions(-) diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 2342b9469181..4c07add44b02 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -45,6 +45,7 @@ static struct percpu_counter mptcp_sockets_allocated ____= cacheline_aligned_in_sm =20 static void __mptcp_destroy_sock(struct sock *sk); static void __mptcp_check_send_data_fin(struct sock *sk); +static void __mptcp_retrans(struct sock *sk); =20 DEFINE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); static struct net_device mptcp_napi_dev; @@ -997,7 +998,7 @@ static void __mptcp_clean_una(struct sock *sk) =20 if (unlikely(dfrag =3D=3D msk->first_pending)) { /* in recovery mode can see ack after the current snd head */ - if (WARN_ON_ONCE(!msk->recovery)) + if (!msk->recovery) break; =20 WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); @@ -1012,7 +1013,7 @@ static void __mptcp_clean_una(struct sock *sk) =20 /* prevent wrap around in recovery mode */ if (unlikely(delta > dfrag->already_sent)) { - if (WARN_ON_ONCE(!msk->recovery)) + if (!msk->recovery) goto out; if (WARN_ON_ONCE(delta > dfrag->data_len)) goto out; @@ -1111,6 +1112,7 @@ struct mptcp_sendmsg_info { u16 sent; unsigned int flags; bool data_lock_held; + struct mptcp_data_frag *last; }; =20 static int mptcp_check_allowed_size(const struct mptcp_sock *msk, struct s= ock *ssk, @@ -1526,6 +1528,7 @@ static int __subflow_push_pending(struct sock *sk, st= ruct sock *ssk, info->sent =3D dfrag->already_sent; info->limit =3D dfrag->data_len; len =3D dfrag->data_len - dfrag->already_sent; + info->last =3D dfrag; while (len > 0) { int ret =3D 0; =20 @@ -1562,14 +1565,19 @@ void __mptcp_push_pending(struct sock *sk, unsigned= int flags) struct sock *prev_ssk =3D NULL, *ssk =3D NULL; struct mptcp_sock *msk =3D mptcp_sk(sk); struct mptcp_subflow_context *subflow; + struct mptcp_data_frag *head, *dfrag; struct mptcp_sendmsg_info info =3D { .flags =3D flags, }; bool do_check_data_fin =3D false; int push_count =3D 1; =20 + head =3D mptcp_send_head(sk); + if (!head) + goto out; + while (mptcp_send_head(sk) && (push_count > 0)) { - int ret =3D 0; + int ret =3D 0, i =3D 0; =20 if (mptcp_sched_get_send(msk)) break; @@ -1578,6 +1586,19 @@ void __mptcp_push_pending(struct sock *sk, unsigned = int flags) =20 mptcp_for_each_subflow(msk, subflow) { if (READ_ONCE(subflow->scheduled)) { + if (i > 0) { + WRITE_ONCE(msk->first_pending, head); + mptcp_push_release(ssk, &info, do_check_data_fin); + + while ((dfrag =3D mptcp_send_head(sk))) { + __mptcp_retrans(sk); + if (dfrag =3D=3D info.last) + break; + WRITE_ONCE(msk->first_pending, mptcp_send_next(sk)); + } + goto out; + } + mptcp_subflow_set_scheduled(subflow, false); =20 prev_ssk =3D ssk; @@ -1605,6 +1626,7 @@ void __mptcp_push_pending(struct sock *sk, unsigned i= nt flags) push_count--; continue; } + i++; do_check_data_fin =3D true; msk->last_snd =3D ssk; } @@ -1614,6 +1636,7 @@ void __mptcp_push_pending(struct sock *sk, unsigned i= nt flags) /* at this point we held the socket lock for the last subflow we used */ mptcp_push_release(ssk, &info, do_check_data_fin); =20 +out: /* ensure the rtx timer is running */ if (!mptcp_timer_pending(sk)) mptcp_reset_timer(sk); @@ -1628,13 +1651,18 @@ static void __mptcp_subflow_push_pending(struct soc= k *sk, struct sock *ssk, bool struct mptcp_sendmsg_info info =3D { .data_lock_held =3D true, }; + struct mptcp_data_frag *head; bool keep_pushing =3D true; struct sock *xmit_ssk; int copied =3D 0; =20 + head =3D mptcp_send_head(sk); + if (!head) + goto out; + info.flags =3D 0; while (mptcp_send_head(sk) && keep_pushing) { - int ret =3D 0; + int ret =3D 0, i =3D 0; =20 /* check for a different subflow usage only after * spooling the first chunk of data @@ -1659,18 +1687,27 @@ static void __mptcp_subflow_push_pending(struct soc= k *sk, struct sock *ssk, bool ret =3D __subflow_push_pending(sk, ssk, &info); if (ret <=3D 0) keep_pushing =3D false; + i++; copied +=3D ret; msk->last_snd =3D ssk; } =20 mptcp_for_each_subflow(msk, subflow) { if (READ_ONCE(subflow->scheduled)) { + if (i > 0) { + WRITE_ONCE(msk->first_pending, head); + if (!test_and_set_bit(MPTCP_WORK_RTX, &msk->flags)) + mptcp_schedule_work(sk); + goto out; + } + mptcp_subflow_set_scheduled(subflow, false); =20 xmit_ssk =3D mptcp_subflow_tcp_sock(subflow); if (xmit_ssk !=3D ssk) { mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SEND); + i++; msk->last_snd =3D xmit_ssk; keep_pushing =3D false; } --=20 2.35.3