On Mon, Feb 21, 2022 at 8:19 PM Eli Cohen <elic@xxxxxxxxxx> wrote:
>
> Allow an admin creating a vdpa device to specify the max MTU for the
> net device.
>
> For example, to create a device with max MTU of 1000, the following
> command can be used:
>
> $ vdpa dev add name vdpa-a mgmtdev auxiliary/mlx5_core.sf.1 mtu 1000
>
> This configuration mechanism assumes that vdpa is the sole real user of
> the function. mlx5_core could theoretically change the mtu of the
> function using the ip command on the mlx5_core net device but this
> should not be done.
>
> Reviewed-by: Si-Wei Liu<si-wei.liu@xxxxxxxxxx>
> Signed-off-by: Eli Cohen <elic@xxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
> v0 -> v1:
> Update changelog
>
> drivers/vdpa/mlx5/net/mlx5_vnet.c | 32 ++++++++++++++++++++++++++++++-
> 1 file changed, 31 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 6156cf6e9377..be095dc1134e 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -2689,6 +2689,28 @@ static int event_handler(struct notifier_block *nb, unsigned long event, void *p
> return ret;
> }
>
> +static int config_func_mtu(struct mlx5_core_dev *mdev, u16 mtu)
> +{
> + int inlen = MLX5_ST_SZ_BYTES(modify_nic_vport_context_in);
> + void *in;
> + int err;
> +
> + in = kvzalloc(inlen, GFP_KERNEL);
> + if (!in)
> + return -ENOMEM;
> +
> + MLX5_SET(modify_nic_vport_context_in, in, field_select.mtu, 1);
> + MLX5_SET(modify_nic_vport_context_in, in, nic_vport_context.mtu,
> + mtu + MLX5V_ETH_HARD_MTU);
> + MLX5_SET(modify_nic_vport_context_in, in, opcode,
> + MLX5_CMD_OP_MODIFY_NIC_VPORT_CONTEXT);
> +
> + err = mlx5_cmd_exec_in(mdev, modify_nic_vport_context, in);
> +
> + kvfree(in);
> + return err;
> +}
> +
> static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
> const struct vdpa_dev_set_config *add_config)
> {
> @@ -2749,6 +2771,13 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
> mutex_init(&ndev->reslock);
> mutex_init(&ndev->numq_lock);
> config = &ndev->config;
> +
> + if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU)) {
> + err = config_func_mtu(mdev, add_config->net.mtu);
> + if (err)
> + goto err_mtu;
> + }
> +
> err = query_mtu(mdev, &mtu);
> if (err)
> goto err_mtu;
> @@ -2867,7 +2896,8 @@ static int mlx5v_probe(struct auxiliary_device *adev,
> mgtdev->mgtdev.device = mdev->device;
> mgtdev->mgtdev.id_table = id_table;
> mgtdev->mgtdev.config_attr_mask = BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR) |
> - BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP);
> + BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP) |
> + BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU);
> mgtdev->mgtdev.max_supported_vqs =
> MLX5_CAP_DEV_VDPA_EMULATION(mdev, max_num_virtio_queues) + 1;
> mgtdev->mgtdev.supported_features = get_supported_features(mdev);
> --
> 2.35.1
>
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