From: Cong Wang <xiyou.wangcong@gmail.com>
To: Petr Machata <petrm@mellanox.com>
Cc: Linux Kernel Network Developers <netdev@vger.kernel.org>,
David Miller <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Eric Dumazet <eric.dumazet@gmail.com>,
Jiri Pirko <jiri@mellanox.com>,
Ido Schimmel <idosch@mellanox.com>
Subject: Re: [PATCH net-next v1 2/5] net: sched: Introduce helpers for qevent blocks
Date: Thu, 9 Jul 2020 12:37:13 -0700 [thread overview]
Message-ID: <CAM_iQpU-fh9Saaxo+6juONn+Xd891sUhgaaoht0Bkn2ssAEm8A@mail.gmail.com> (raw)
In-Reply-To: <87v9ixh7es.fsf@mellanox.com>
On Wed, Jul 8, 2020 at 5:13 PM Petr Machata <petrm@mellanox.com> wrote:
>
>
> Petr Machata <petrm@mellanox.com> writes:
>
> > Cong Wang <xiyou.wangcong@gmail.com> writes:
> >
> > I'll think about it some more. For now I will at least fix the lack of
> > locking.
>
> I guess I could store smp_processor_id() that acquired the lock in
> struct qdisc_skb_head. Do a trylock instead of lock, and on fail check
> the stored value. I'll need to be careful about the race between
> unsuccessful trylock and the test, and about making sure CPU ID doesn't
> change after it is read. I'll probe this tomorrow.
Like __netif_tx_lock(), right? Seems doable.
Thanks.
next prev parent reply other threads:[~2020-07-09 19:37 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-26 22:45 [PATCH net-next v1 0/5] TC: Introduce qevents Petr Machata
2020-06-26 22:45 ` [PATCH net-next v1 1/5] net: sched: Pass root lock to Qdisc_ops.enqueue Petr Machata
2020-07-06 19:21 ` Cong Wang
2020-07-07 15:25 ` Petr Machata
2020-07-07 19:41 ` Cong Wang
2020-06-26 22:45 ` [PATCH net-next v1 2/5] net: sched: Introduce helpers for qevent blocks Petr Machata
2020-07-06 19:48 ` Cong Wang
2020-07-07 15:22 ` Petr Machata
2020-07-07 19:13 ` Cong Wang
2020-07-08 12:35 ` Petr Machata
2020-07-08 16:21 ` Petr Machata
2020-07-08 19:09 ` Cong Wang
2020-07-08 19:04 ` Cong Wang
2020-07-08 21:04 ` Petr Machata
2020-07-09 0:13 ` Petr Machata
2020-07-09 19:37 ` Cong Wang [this message]
2020-07-10 14:40 ` Petr Machata
2020-07-14 2:51 ` Cong Wang
2020-07-14 9:12 ` Petr Machata
2020-07-07 19:48 ` Cong Wang
2020-07-08 9:19 ` Petr Machata
2020-06-26 22:45 ` [PATCH net-next v1 3/5] net: sched: sch_red: Split init and change callbacks Petr Machata
2020-06-26 22:45 ` [PATCH net-next v1 4/5] net: sched: sch_red: Add qevents "early_drop" and "mark" Petr Machata
2020-06-26 22:45 ` [PATCH net-next v1 5/5] selftests: forwarding: Add a RED test for SW datapath Petr Machata
2020-06-26 22:45 ` [PATCH iproute2-next v1 1/4] uapi: pkt_sched: Add two new RED attributes Petr Machata
2020-06-26 22:45 ` [PATCH iproute2-next v1 2/4] tc: Add helpers to support qevent handling Petr Machata
2020-06-26 22:45 ` [PATCH iproute2-next v1 3/4] man: tc: Describe qevents Petr Machata
2020-06-26 22:45 ` [PATCH iproute2-next v1 4/4] tc: q_red: Add support for qevents "mark" and "early_drop" Petr Machata
2020-06-26 22:56 ` [PATCH net-next v1 0/5] TC: Introduce qevents Stephen Hemminger
2020-06-29 13:21 ` Petr Machata
2020-06-30 0:15 ` David Miller
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