netdev - Re: [PATCH net-next v4 8/8] virtio-net: support queue stat

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Date: Thu, 14 Mar 2024 15:56:16 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, "Michael S.
 Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, Alexei
 Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 Jesper Dangaard Brouer <hawk@...nel.org>, John Fastabend
 <john.fastabend@...il.com>, Stanislav Fomichev <sdf@...gle.com>, Amritha
 Nambiar <amritha.nambiar@...el.com>, Larysa Zaremba
 <larysa.zaremba@...el.com>, Sridhar Samudrala
 <sridhar.samudrala@...el.com>, Maciej Fijalkowski
 <maciej.fijalkowski@...el.com>, virtualization@...ts.linux.dev,
 bpf@...r.kernel.org
Subject: Re: [PATCH net-next v4 8/8] virtio-net: support queue stat

On Thu, 14 Mar 2024 16:54:59 +0800 Xuan Zhuo wrote:
> +static void virtnet_get_base_stats(struct net_device *dev,
> +				   struct netdev_queue_stats_rx *rx,
> +				   struct netdev_queue_stats_tx *tx)
> +{
> +	/* The queue stats of the virtio-net will not be reset. So here we
> +	 * return 0.
> +	 */
> +	memset(rx, 0, sizeof(*rx));
> +	memset(tx, 0, sizeof(*tx));
> +}

/**
 * struct netdev_stat_ops - netdev ops for fine grained stats
 * @get_queue_stats_rx:	get stats for a given Rx queue
 * @get_queue_stats_tx:	get stats for a given Tx queue
 * @get_base_stats:	get base stats (not belonging to any live instance)
 *
 * Query stats for a given object. The values of the statistics are undefined
 * on entry (specifically they are *not* zero-initialized). Drivers should
 * assign values only to the statistics they collect. Statistics which are not
 * collected must be left undefined.                  ^^^^^^^^^^^^^^^^^^^^^^^^
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^