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

[Matan Azrad]

From: Ferruh Yigit, Tuesday, April 24, 2018 5:20 PM
> On 4/10/2018 4:39 PM, Matan Azrad wrote:
> > It is OK for me.
> 
> Converting this to explicit ack:
> Acked-by: Matan Azrad <matan at mellanox.com>
> 

Ok, don't forget to remove the fixes line.

> > 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 at mellanox.com>; dev at dpdk.org
> >>> Cc: Thomas Monjalon <thomas at monjalon.net>; Olga Shern
> >>> <olgas at mellanox.com>; stable at 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 at dpdk.org
> >>>>
> >>>> Signed-off-by: Ophir Munk <ophirmu at 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
> >