netdev - Re: [PATCH v3 4/4] virtio_net: disable cb aggressively

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Date:   Wed, 26 May 2021 12:39:18 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Wei Wang <weiwan@...gle.com>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        Willem de Bruijn <willemb@...gle.com>,
        virtualization@...ts.linux-foundation.org,
        Jason Wang <jasowang@...hat.com>
Subject: Re: [PATCH v3 4/4] virtio_net: disable cb aggressively

On Wed, 26 May 2021 04:24:43 -0400 Michael S. Tsirkin wrote:
> @@ -1605,12 +1608,17 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
>  	struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
>  	bool kick = !netdev_xmit_more();
>  	bool use_napi = sq->napi.weight;
> +	unsigned int bytes = skb->len;

FWIW GCC says bytes is unused.