在 2022/1/7 上午9:50, Si-Wei Liu 写道:
On 1/6/2022 5:27 PM, Si-Wei Liu wrote:Apologies to reply to myself. It looks to me we need to set cur_num_vqs to the negotiated num of queues. Otherwise any site referencing cur_num_vqs won't work properly. Further, we need to validate VIRTIO_NET_F_MQ is present in handle_ctrl_mq() before changing the number of queue pairs.On 1/5/2022 3:46 AM, Eli Cohen wrote:Check whether the max number of data virtqueue pairs was provided when aadding a new device and verify the new value does not exceed device capabilities. In addition, change the arrays holding virtqueue and callback contexts to be dynamically allocated. Signed-off-by: Eli Cohen <elic@xxxxxxxxxx> --- v6 -> v7: 1. Evaluate RQT table size based on config.max_virtqueue_pairs.drivers/vdpa/mlx5/net/mlx5_vnet.c | 51 ++++++++++++++++++++++---------1 file changed, 37 insertions(+), 14 deletions(-)diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.cindex 4a2149f70f1e..d4720444bf78 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -131,11 +131,6 @@ struct mlx5_vdpa_virtqueue { struct mlx5_vq_restore_info ri; }; -/* We will remove this limitation once mlx5_vdpa_alloc_resources() - * provides for driver space allocation - */ -#define MLX5_MAX_SUPPORTED_VQS 16 - static bool is_index_valid(struct mlx5_vdpa_dev *mvdev, u16 idx) { if (unlikely(idx > mvdev->max_idx)) @@ -148,8 +143,8 @@ struct mlx5_vdpa_net { struct mlx5_vdpa_dev mvdev; struct mlx5_vdpa_net_resources res; struct virtio_net_config config; - struct mlx5_vdpa_virtqueue vqs[MLX5_MAX_SUPPORTED_VQS]; - struct vdpa_callback event_cbs[MLX5_MAX_SUPPORTED_VQS + 1]; + struct mlx5_vdpa_virtqueue *vqs; + struct vdpa_callback *event_cbs;/* Serialize vq resources creation and destruction. This is required * since memory map might change and we need to destroy and create @@ -1218,7 +1213,7 @@ static void suspend_vqs(struct mlx5_vdpa_net *ndev){ int i; - for (i = 0; i < MLX5_MAX_SUPPORTED_VQS; i++) + for (i = 0; i < ndev->mvdev.max_vqs; i++) suspend_vq(ndev, &ndev->vqs[i]); }@@ -1244,8 +1239,14 @@ static int create_rqt(struct mlx5_vdpa_net *ndev)void *in; int i, j; int err; + int num; - max_rqt = min_t(int, MLX5_MAX_SUPPORTED_VQS / 2, + if (!(ndev->mvdev.actual_features & BIT_ULL(VIRTIO_NET_F_MQ))) + num = 1; + else + num = le16_to_cpu(ndev->config.max_virtqueue_pairs); + + max_rqt = min_t(int, roundup_pow_of_two(num), 1 << MLX5_CAP_GEN(ndev->mvdev.mdev, log_max_rqt_size)); if (max_rqt < 1) return -EOPNOTSUPP; @@ -1262,7 +1263,7 @@ static int create_rqt(struct mlx5_vdpa_net *ndev) MLX5_SET(rqtc, rqtc, rqt_max_size, max_rqt); list = MLX5_ADDR_OF(rqtc, rqtc, rq_num[0]); for (i = 0, j = 0; i < max_rqt; i++, j += 2)- list[i] = cpu_to_be32(ndev->vqs[j % ndev->mvdev.max_vqs].virtq_id);+ list[i] = cpu_to_be32(ndev->vqs[j % (2 * num)].virtq_id);Good catch. LGTM. Reviewed-by: Si-Wei Liu<si-wei.liu@xxxxxxxxxx>
Such validation is not mandated in the spec. And if we want to do that, it needs to be done in a separate patch.
Thanks
So just disregard my previous R-b for this patch. Thanks, -SiweiMLX5_SET(rqtc, rqtc, rqt_actual_size, max_rqt);err = mlx5_vdpa_create_rqt(&ndev->mvdev, in, inlen, &ndev->res.rqtn); @@ -2220,7 +2221,7 @@ static int mlx5_vdpa_reset(struct vdpa_device *vdev)clear_vqs_ready(ndev); mlx5_vdpa_destroy_mr(&ndev->mvdev); ndev->mvdev.status = 0; - memset(ndev->event_cbs, 0, sizeof(ndev->event_cbs));+ memset(ndev->event_cbs, 0, sizeof(*ndev->event_cbs) * (mvdev->max_vqs + 1));ndev->mvdev.actual_features = 0; ++mvdev->generation; if (MLX5_CAP_GEN(mvdev->mdev, umem_uid_0)) {@@ -2293,6 +2294,8 @@ static void mlx5_vdpa_free(struct vdpa_device *vdev)} mlx5_vdpa_free_resources(&ndev->mvdev); mutex_destroy(&ndev->reslock); + kfree(ndev->event_cbs); + kfree(ndev->vqs); }static struct vdpa_notification_area mlx5_get_vq_notification(struct vdpa_device *vdev, u16 idx) @@ -2538,15 +2541,33 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,return -EOPNOTSUPP; }- /* we save one virtqueue for control virtqueue should we require it */ max_vqs = MLX5_CAP_DEV_VDPA_EMULATION(mdev, max_num_virtio_queues);- max_vqs = min_t(u32, max_vqs, MLX5_MAX_SUPPORTED_VQS); + if (max_vqs < 2) { + dev_warn(mdev->device, + "%d virtqueues are supported. At least 2 are required\n", + max_vqs); + return -EAGAIN; + } + + if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP)) { + if (add_config->net.max_vq_pairs > max_vqs / 2) + return -EINVAL;+ max_vqs = min_t(u32, max_vqs, 2 * add_config->net.max_vq_pairs);+ } else { + max_vqs = 2; + }ndev = vdpa_alloc_device(struct mlx5_vdpa_net, mvdev.vdev, mdev->device, &mlx5_vdpa_ops,name, false); if (IS_ERR(ndev)) return PTR_ERR(ndev); + ndev->vqs = kcalloc(max_vqs, sizeof(*ndev->vqs), GFP_KERNEL);+ ndev->event_cbs = kcalloc(max_vqs + 1, sizeof(*ndev->event_cbs), GFP_KERNEL);+ if (!ndev->vqs || !ndev->event_cbs) { + err = -ENOMEM; + goto err_alloc; + } ndev->mvdev.max_vqs = max_vqs; mvdev = &ndev->mvdev; mvdev->mdev = mdev;@@ -2627,6 +2648,7 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,mlx5_mpfs_del_mac(pfmdev, config->mac); err_mtu: mutex_destroy(&ndev->reslock); +err_alloc: put_device(&mvdev->vdev.dev); return err; }@@ -2669,7 +2691,8 @@ static int mlx5v_probe(struct auxiliary_device *adev,mgtdev->mgtdev.ops = &mdev_ops; mgtdev->mgtdev.device = mdev->device; mgtdev->mgtdev.id_table = id_table;- mgtdev->mgtdev.config_attr_mask = BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR); + mgtdev->mgtdev.config_attr_mask = BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR) |+ BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP); mgtdev->madev = madev; err = vdpa_mgmtdev_register(&mgtdev->mgtdev);
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