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

[Matan Azrad <matan@mellanox.com>]

It is OK for me.
Thanks.

From: Ophir Munk, Tuesday, April 10, 2018 6:36 PM
> Hi.
> Discussed with Thomas.
> Please consider the following commit message:
> 
> net/vdev_netvsc: shorten devices names
> 
> 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".
> This commits creates tap and failsafe devices with short names such as
> "net_tap_netvsc0" or "net_failsafe_netvsc0".
> 
> > -----Original Message-----
> > From: Matan Azrad
> > Sent: Tuesday, April 10, 2018 11:04 AM
> > To: Ophir Munk <ophirmu@mellanox.com>; dev@dpdk.org
> > Cc: Thomas Monjalon <thomas@monjalon.net>; Olga Shern
> > <olgas@mellanox.com>; stable@dpdk.org
> > Subject: RE: [PATCH v1] net/vdev_netvsc: fix creating short name
> > devices
> >
> > 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