On 11/5/24 21:31, Joe Damato wrote:
> On Mon, Nov 04, 2024 at 04:57:06PM +0800, Philo Lu wrote:
>> RSS configuration should be updated with queue number. In particular, it
>> should be updated when (1) rss enabled and (2) default rss configuration
>> is used without user modification.
>>
>> During rss command processing, device updates queue_pairs using
>> rss.max_tx_vq. That is, the device updates queue_pairs together with
>> rss, so we can skip the sperate queue_pairs update
>> (VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET below) and return directly.
>>
>> Also remove the `vi->has_rss ?` check when setting vi->rss.max_tx_vq,
>> because this is not used in the other hash_report case.
>>
>> Fixes: c7114b1249fa ("drivers/net/virtio_net: Added basic RSS support.")
>> Signed-off-by: Philo Lu <lulie@xxxxxxxxxxxxxxxxx>
>> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
>> ---
>> drivers/net/virtio_net.c | 65 +++++++++++++++++++++++++++++++---------
>> 1 file changed, 51 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
>> index 59d9fdf562e0..189afad3ffaa 100644
>> --- a/drivers/net/virtio_net.c
>> +++ b/drivers/net/virtio_net.c
>> @@ -3394,15 +3394,59 @@ static void virtnet_ack_link_announce(struct virtnet_info *vi)
>> dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
>> }
>>
>> +static bool virtnet_commit_rss_command(struct virtnet_info *vi);
>> +
>> +static void virtnet_rss_update_by_qpairs(struct virtnet_info *vi, u16 queue_pairs)
>> +{
>> + u32 indir_val = 0;
>> + int i = 0;
>> +
>> + for (; i < vi->rss_indir_table_size; ++i) {
>> + indir_val = ethtool_rxfh_indir_default(i, queue_pairs);
>> + vi->rss.indirection_table[i] = indir_val;
>> + }
>> + vi->rss.max_tx_vq = queue_pairs;
>> +}
>> +
>> static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
>> {
>> struct virtio_net_ctrl_mq *mq __free(kfree) = NULL;
>> - struct scatterlist sg;
>> + struct virtio_net_ctrl_rss old_rss;
>> struct net_device *dev = vi->dev;
>> + struct scatterlist sg;
>>
>> if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
>> return 0;
>>
>> + /* Firstly check if we need update rss. Do updating if both (1) rss enabled and
>> + * (2) no user configuration.
>> + *
>> + * During rss command processing, device updates queue_pairs using rss.max_tx_vq. That is,
>> + * the device updates queue_pairs together with rss, so we can skip the sperate queue_pairs
>> + * update (VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET below) and return directly.
>> + */
>> + if (vi->has_rss && !netif_is_rxfh_configured(dev)) {
>
> Does there need to be an error case when:
>
> vi->has_rss && netif_is_rxfh_configured(dev)
>
> to return EINVAL? I noted that other drivers don't let users adjust
> the queue count and return error in this case.
AFAICS the above is orthogonal to this patch - i.e. lack of check is
pre-existing and not introduced here. I'm not 110% sure the lack of
check is illegit, but I think it should eventually handled with a
separate patch/series.
Thanks,
Paolo
