On Tue, May 02, 2023 at 01:41:34PM -0400, Feng Liu wrote:
> When initializing XDP in virtnet_open(), some rq xdp initialization
> may hit an error causing net device open failed. However, previous
> rqs have already initialized XDP and enabled NAPI, which is not the
> expected behavior. Need to roll back the previous rq initialization
> to avoid leaks in error unwinding of init code.
>
> Also extract a helper function of disable queue pairs, and use newly
> introduced helper function in error unwinding and virtnet_close;
>
> Fixes: 754b8a21a96d ("virtio_net: setup xdp_rxq_info")
> Signed-off-by: Feng Liu <feliu@xxxxxxxxxx>
> Reviewed-by: William Tu <witu@xxxxxxxxxx>
> Reviewed-by: Parav Pandit <parav@xxxxxxxxxx>
> Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
> Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> ---
> drivers/net/virtio_net.c | 31 +++++++++++++++++++++----------
> 1 file changed, 21 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 8d8038538fc4..5cd78e154d14 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1868,6 +1868,13 @@ static int virtnet_poll(struct napi_struct *napi, int budget)
> return received;
> }
>
> +static void virtnet_disable_qp(struct virtnet_info *vi, int qp_index)
> +{
> + virtnet_napi_tx_disable(&vi->sq[qp_index].napi);
> + napi_disable(&vi->rq[qp_index].napi);
> + xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
> +}
> +
> static int virtnet_open(struct net_device *dev)
> {
> struct virtnet_info *vi = netdev_priv(dev);
> @@ -1883,20 +1890,27 @@ static int virtnet_open(struct net_device *dev)
>
> err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id);
> if (err < 0)
> - return err;
> + goto err_xdp_info_reg;
>
> err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
> MEM_TYPE_PAGE_SHARED, NULL);
> - if (err < 0) {
> - xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
> - return err;
> - }
> + if (err < 0)
> + goto err_xdp_reg_mem_model;
>
> virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
> virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
> }
>
> return 0;
> +
> + /* error unwinding of xdp init */
btw we don't really need this comment - it's how all
error handling is done anyways.
if you need to roll v3, you can drop it.
> +err_xdp_reg_mem_model:
> + xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
> +err_xdp_info_reg:
> + for (i = i - 1; i >= 0; i--)
> + virtnet_disable_qp(vi, i);
> +
> + return err;
> }
>
> static int virtnet_poll_tx(struct napi_struct *napi, int budget)
> @@ -2305,11 +2319,8 @@ static int virtnet_close(struct net_device *dev)
> /* Make sure refill_work doesn't re-enable napi! */
> cancel_delayed_work_sync(&vi->refill);
>
> - for (i = 0; i < vi->max_queue_pairs; i++) {
> - virtnet_napi_tx_disable(&vi->sq[i].napi);
> - napi_disable(&vi->rq[i].napi);
> - xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
> - }
> + for (i = 0; i < vi->max_queue_pairs; i++)
> + virtnet_disable_qp(vi, i);
>
> return 0;
> }
> --
> 2.37.1 (Apple Git-137.1)
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