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Tsirkin" To: linux-kernel@vger.kernel.org Cc: Xuan Zhuo , Jason Wang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Linus Torvalds , Jens Axboe , James Bottomley , "Martin K. Petersen" , Guenter Roeck , Greg KH , Andres Freund Subject: [PATCH v2 1/5] virtio_net: Revert "virtio_net: set the default max ring size by find_vqs()" Message-ID: <20220815215251.154451-3-mst@redhat.com> References: <20220815215251.154451-1-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220815215251.154451-1-mst@redhat.com> X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This reverts commit 762faee5a2678559d3dc09d95f8f2c54cd0466a7. This has been reported to trip up guests on GCP (Google Cloud). The reason is that virtio_find_vqs_ctx_size is broken on legacy devices. We can in theory fix virtio_find_vqs_ctx_size but in fact the patch itself has several other issues: - It treats unknown speed as < 10G - It leaves userspace no way to find out the ring size set by hypervisor - It tests speed when link is down - It ignores the virtio spec advice: Both \field{speed} and \field{duplex} can change, thus the driver is expected to re-read these values after receiving a configuration change notification. - It is not clear the performance impact has been tested properly Revert the patch for now. Reported-by: Andres Freund Link: https://lore.kernel.org/r/20220814212610.GA3690074%40roeck-us.net Link: https://lore.kernel.org/r/20220815070203.plwjx7b3cyugpdt7%40awork3.an= arazel.de Link: https://lore.kernel.org/r/3df6bb82-1951-455d-a768-e9e1513eb667%40www.= fastmail.com Link: https://lore.kernel.org/r/FCDC5DDE-3CDD-4B8A-916F-CA7D87B547CE%40anar= azel.de Fixes: 762faee5a267 ("virtio_net: set the default max ring size by find_vqs= ()") Cc: Xuan Zhuo Cc: Jason Wang Signed-off-by: Michael S. Tsirkin Tested-by: Andres Freund Tested-by: From: Guenter Roeck --- drivers/net/virtio_net.c | 42 ++++------------------------------------ 1 file changed, 4 insertions(+), 38 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index d934774e9733..ece00b84e3a7 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -3432,29 +3432,6 @@ static unsigned int mergeable_min_buf_len(struct vir= tnet_info *vi, struct virtqu (unsigned int)GOOD_PACKET_LEN); } =20 -static void virtnet_config_sizes(struct virtnet_info *vi, u32 *sizes) -{ - u32 i, rx_size, tx_size; - - if (vi->speed =3D=3D SPEED_UNKNOWN || vi->speed < SPEED_10000) { - rx_size =3D 1024; - tx_size =3D 1024; - - } else if (vi->speed < SPEED_40000) { - rx_size =3D 1024 * 4; - tx_size =3D 1024 * 4; - - } else { - rx_size =3D 1024 * 8; - tx_size =3D 1024 * 8; - } - - for (i =3D 0; i < vi->max_queue_pairs; i++) { - sizes[rxq2vq(i)] =3D rx_size; - sizes[txq2vq(i)] =3D tx_size; - } -} - static int virtnet_find_vqs(struct virtnet_info *vi) { vq_callback_t **callbacks; @@ -3462,7 +3439,6 @@ static int virtnet_find_vqs(struct virtnet_info *vi) int ret =3D -ENOMEM; int i, total_vqs; const char **names; - u32 *sizes; bool *ctx; =20 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by @@ -3490,15 +3466,10 @@ static int virtnet_find_vqs(struct virtnet_info *vi) ctx =3D NULL; } =20 - sizes =3D kmalloc_array(total_vqs, sizeof(*sizes), GFP_KERNEL); - if (!sizes) - goto err_sizes; - /* Parameters for control virtqueue, if any */ if (vi->has_cvq) { callbacks[total_vqs - 1] =3D NULL; names[total_vqs - 1] =3D "control"; - sizes[total_vqs - 1] =3D 64; } =20 /* Allocate/initialize parameters for send/receive virtqueues */ @@ -3513,10 +3484,8 @@ static int virtnet_find_vqs(struct virtnet_info *vi) ctx[rxq2vq(i)] =3D true; } =20 - virtnet_config_sizes(vi, sizes); - - ret =3D virtio_find_vqs_ctx_size(vi->vdev, total_vqs, vqs, callbacks, - names, sizes, ctx, NULL); + ret =3D virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks, + names, ctx, NULL); if (ret) goto err_find; =20 @@ -3536,8 +3505,6 @@ static int virtnet_find_vqs(struct virtnet_info *vi) =20 =20 err_find: - kfree(sizes); -err_sizes: kfree(ctx); err_ctx: kfree(names); @@ -3897,9 +3864,6 @@ static int virtnet_probe(struct virtio_device *vdev) vi->curr_queue_pairs =3D num_online_cpus(); vi->max_queue_pairs =3D max_queue_pairs; =20 - virtnet_init_settings(dev); - virtnet_update_settings(vi); - /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ err =3D init_vqs(vi); if (err) @@ -3912,6 +3876,8 @@ static int virtnet_probe(struct virtio_device *vdev) netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); =20 + virtnet_init_settings(dev); + if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { vi->failover =3D net_failover_create(vi->dev); if (IS_ERR(vi->failover)) { --=20 MST