Re: [PATCH v1] net/vdev_netvsc: fix creating short name devices

[Matan Azrad <matan@mellanox.com>]

Hi Ophir

From: Ophir Munk, Tuesday, April 10, 2018 10:20 AM
> Prior to this commit the vdev_netvsc PMD was creating tap and failsafe
> devices with long names, such as "net_tap_net_vdev_netvsc0" or
> "net_failsafe_net_vdev_netvsc0".
> Long names containing more than 32 characters may be rejected by some
> APIs (e.g. membuf pool creation).

Since EAL allows to use long names, I don't think it is a problem of the netvsc device.
If a DPDK entity wants to use this name for some reason it needs to adjust it to the usage. 

I agree that short names are better and may help for such like cases.

I suggest the next title:
net/vdev_netvsc: use short device names

> This commits fixes this issue by creating tap and failsafe devices with short
> names such as "tap_net_vsc0" or "net_failsafe_vsc0".
> 
> Fixes: e7dc5d7becc5 ("net/vdev_netvsc: implement core functionality")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Ophir Munk <ophirmu@mellanox.com>
> ---
>  drivers/net/vdev_netvsc/vdev_netvsc.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c
> b/drivers/net/vdev_netvsc/vdev_netvsc.c
> index db0080a..bb2f78d 100644
> --- a/drivers/net/vdev_netvsc/vdev_netvsc.c
> +++ b/drivers/net/vdev_netvsc/vdev_netvsc.c
> @@ -614,13 +614,13 @@ vdev_netvsc_netvsc_probe(const struct
> if_nameindex *iface,
>  		       name, ctx->id);
>  	if (ret == -1 || (size_t)ret >= sizeof(ctx->name))
>  		++i;
> -	ret = snprintf(ctx->devname, sizeof(ctx->devname),
> "net_failsafe_%s",
> -		       ctx->name);
> +	ret = snprintf(ctx->devname, sizeof(ctx->devname),
> "net_failsafe_vsc%u",
> +		       ctx->id);
>  	if (ret == -1 || (size_t)ret >= sizeof(ctx->devname))
>  		++i;
>  	ret = snprintf(ctx->devargs, sizeof(ctx->devargs),
> -		       "fd(%d),dev(net_tap_%s,remote=%s)",
> -		       ctx->pipe[0], ctx->name, ctx->if_name);
> +		       "fd(%d),dev(net_tap_vsc%u,remote=%s)",
> +		       ctx->pipe[0], ctx->id, ctx->if_name);
>  	if (ret == -1 || (size_t)ret >= sizeof(ctx->devargs))
>  		++i;
>  	if (i) {
> --
> 2.7.4