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net/mlx5: Add support for configuring max device MTU

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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@oracle.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20220221121927.194728-1-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Eli Cohen 2022-02-21 14:19:27 +02:00 committed by Michael S. Tsirkin
parent ea993de113
commit 1e00e821e4
1 changed files with 31 additions and 1 deletions
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32
drivers/vdpa/mlx5/net/mlx5_vnet.c
View File

@ -2565,6 +2565,28 @@ 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)
{
@ -2624,6 +2646,13 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
init_mvqs(ndev);
mutex_init(&ndev->reslock);
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;
@ -2741,7 +2770,8 @@ 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);