netdev - Re: [PATCH net-next v6 8/8] virtio-net: support queue stat

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Date: Wed, 24 Apr 2024 20:44:22 -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 v6 8/8] virtio-net: support queue stat

On Tue, 23 Apr 2024 19:31:41 +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.
> +	 */
> +	rx->bytes = 0;
> +	rx->packets = 0;
> +	rx->alloc_fail = 0;
> +	rx->hw_drops = 0;
> +	rx->hw_drop_overruns = 0;
> +	rx->csum_unnecessary = 0;
> +	rx->csum_none = 0;
> +	rx->csum_bad = 0;
> +	rx->hw_gro_packets = 0;
> +	rx->hw_gro_bytes = 0;
> +	rx->hw_gro_wire_packets = 0;
> +	rx->hw_gro_wire_bytes = 0;
> +	rx->hw_drop_ratelimits = 0;
> +
> +	tx->bytes = 0;
> +	tx->packets = 0;
> +	tx->hw_drops = 0;
> +	tx->hw_drop_errors = 0;
> +	tx->csum_none = 0;
> +	tx->needs_csum = 0;
> +	tx->hw_gso_packets = 0;
> +	tx->hw_gso_bytes = 0;
> +	tx->hw_gso_wire_packets = 0;
> +	tx->hw_gso_wire_bytes = 0;
> +	tx->hw_drop_ratelimits = 0;

Doesn't this need to be conditional based on device capabilities?
We should only assign the stats that the device is collecting
(both in base stats and per-queue).