* ref count of ib_ipoib.ko not incremented when an ip address is set
@ 2016-07-22 8:16 Nikolay Borisov
2016-07-22 22:23 ` Stephen Hemminger
0 siblings, 1 reply; 2+ messages in thread
From: Nikolay Borisov @ 2016-07-22 8:16 UTC (permalink / raw)
To: netdev
Cc: linux-rdma@vger.kernel.org, David Miller, sean.hefty, dledford,
SiteGround Operations
Hello,
I accidentally saw that even having an ip address on an
ipoib interface doesn't increment the usage count of the
ib_ipoib.ko module:
ip a l dev ib0
14: ib0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65520 qdisc pfifo_fast state UP qlen 256
link/infiniband 80:00:02:d4:fe:80:00:00:00:00:00:00:e4:1d:2d:03:00:00:f8:31 brd 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff
inet 172.16.0.150/24 brd 172.16.0.255 scope global ib0
valid_lft forever preferred_lft forever
lsmod | grep ib_ipoib
ib_ipoib 79026 0
ib_cm 34144 3 ib_ipoib,ib_ucm,rdma_cm
ib_sa 26598 5 ib_ipoib,rdma_ucm,rdma_cm,ib_cm,mlx4_ib
ib_core 97620 10 ib_ipoib,ib_ucm,ib_uverbs,rdma_cm,iw_cm,ib_umad,ib_cm,mlx4_ib,ib_sa,ib_mad
ipv6 374806 259 ib_ipoib,rdma_cm,ib_addr,[permanent]
In this case I can rmmod ib_ipoib.ko which would remove,
but in practice I've observed that when an ip address is set
the underlying module providing the interface usually gets
its ref count incremented. Is this normal or is a
refcount increment is amiss?
Regards,
Nikolay
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: ref count of ib_ipoib.ko not incremented when an ip address is set
2016-07-22 8:16 ref count of ib_ipoib.ko not incremented when an ip address is set Nikolay Borisov
@ 2016-07-22 22:23 ` Stephen Hemminger
0 siblings, 0 replies; 2+ messages in thread
From: Stephen Hemminger @ 2016-07-22 22:23 UTC (permalink / raw)
To: Nikolay Borisov
Cc: netdev, linux-rdma@vger.kernel.org, David Miller, sean.hefty,
dledford, SiteGround Operations
On Fri, 22 Jul 2016 11:16:02 +0300
Nikolay Borisov <kernel@kyup.com> wrote:
> Hello,
>
> I accidentally saw that even having an ip address on an
> ipoib interface doesn't increment the usage count of the
> ib_ipoib.ko module:
>
> ip a l dev ib0
> 14: ib0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65520 qdisc pfifo_fast state UP qlen 256
> link/infiniband 80:00:02:d4:fe:80:00:00:00:00:00:00:e4:1d:2d:03:00:00:f8:31 brd 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff
> inet 172.16.0.150/24 brd 172.16.0.255 scope global ib0
> valid_lft forever preferred_lft forever
>
> lsmod | grep ib_ipoib
> ib_ipoib 79026 0
> ib_cm 34144 3 ib_ipoib,ib_ucm,rdma_cm
> ib_sa 26598 5 ib_ipoib,rdma_ucm,rdma_cm,ib_cm,mlx4_ib
> ib_core 97620 10 ib_ipoib,ib_ucm,ib_uverbs,rdma_cm,iw_cm,ib_umad,ib_cm,mlx4_ib,ib_sa,ib_mad
> ipv6 374806 259 ib_ipoib,rdma_cm,ib_addr,[permanent]
>
>
> In this case I can rmmod ib_ipoib.ko which would remove,
> but in practice I've observed that when an ip address is set
> the underlying module providing the interface usually gets
> its ref count incremented. Is this normal or is a
> refcount increment is amiss?
>
> Regards,
> Nikolay
Network devices are always supposed to have module refcount of zero
and they can be rmmod'd safely. This was an intentional design decision
all the way back to 2.5 version.
^ permalink raw reply [flat|nested] 2+ messages in thread
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