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Tsirkin" To: Feng Liu Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, Jason Wang , Xuan Zhuo , Simon Horman , William Tu , Parav Pandit Subject: Re: [PATCH net v2] virtio_net: Fix error unwinding of XDP initialization Message-ID: <20230502143148-mutt-send-email-mst@kernel.org> References: <20230502174134.32276-1-feliu@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230502174134.32276-1-feliu@nvidia.com> Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org 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 > Reviewed-by: William Tu > Reviewed-by: Parav Pandit > Reviewed-by: Simon Horman > Acked-by: Michael S. Tsirkin > --- > 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)