Re: [PATCH v2 5/5] net/virtio: improve offload check performance

[Tiwei Bie <tiwei.bie@intel.com>]

On Wed, Jun 06, 2018 at 02:31:28PM +0200, Maxime Coquelin wrote:
> Instead of checking the multiple Virtio features bits for
> every packet, let's do the check once at configure time and
> store it in virtio_hw struct.
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
[...]
> @@ -270,8 +261,7 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
>  		 * which is wrong. Below subtract restores correct pkt size.
>  		 */
>  		cookie->pkt_len -= head_size;
> -		/* if offload disabled, it is not zeroed below, do it now */

I think there is no need to remove this comment.

Apart from that,

Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>

> -		if (offload == 0) {
> +		if (!vq->hw->has_tx_offload) {
>  			ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
>  			ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
>  			ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
[...]