netdev - Re: [Patch net-next v3 3/3] net_sched: implement ->change_tx_queue_len() for pfifo

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Message-ID: <0f00a250-a3d7-47cf-21bd-e893e4b36afa@redhat.com>
Date:   Mon, 29 Jan 2018 11:31:42 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        John Fastabend <john.fastabend@...il.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [Patch net-next v3 3/3] net_sched: implement
 ->change_tx_queue_len() for pfifo_fast



On 2018年01月26日 12:01, Cong Wang wrote:
>> Is __skb_array_empty() in pfifo_fast_dequeue() still safe after this change?
> Yes, we sync with dequeue path before calling ->change_tx_queue_len().
> I already mentioned this in patch 2/3.

Aha, ok, I think I get the synchronize_net() trick in dev_deactivate_many().

Thanks