Re: [PATCH] Add missing ib_uverbs dependency from SoftiWARP

[Jason Gunthorpe <jgg@nvidia.com>]

On Wed, Sep 07, 2022 at 11:24:19AM -0400, Tom Talpey wrote:

> On 9/7/2022 10:06 AM, Jason Gunthorpe wrote:
> > On Wed, Sep 07, 2022 at 09:57:43AM -0400, Tom Talpey wrote:
> > 
> > > You can test it easily, just load siw on a laptop without any
> > > other RDMA provider. The ib_uverbs module will not be loaded,
> > > and the siw provider won't be seen, rping -s will run but peers
> > > cannot connect for example.
> > 
> > Perhaps there is something funky with rping, it works fine in simpler cases:
> > 
> > $ rdma link show
> > link siw0/1 state ACTIVE physical_state LINK_UP netdev enp0s31f6
> > $ sudo rmmod ib_uverbs
> > $ build/bin/ibv_devinfo
> > hca_id:	siw0
> > 	transport:			iWARP (1)
> > 	fw_ver:				0.0.0
> > 	node_guid:			7686:e2ff:fe28:63fc
> > 	sys_image_guid:			7486:e228:63fc:0000
> > 	vendor_id:			0x626d74
> > 	vendor_part_id:			1
> > 	hw_ver:				0x0
> > 	phys_port_cnt:			1
> > 		port:	1
> > 			state:			PORT_ACTIVE (4)
> > 			max_mtu:		1024 (3)
> > 			active_mtu:		1024 (3)
> > 			sm_lid:			0
> > 			port_lid:		0
> > 			port_lmc:		0x00
> > 			link_layer:		Ethernet
> > $ lsmod | grep -i uverb
> > ib_uverbs             163840  0
> > ib_core               393216  2 ib_uverbs,siw
> 
> 
> That's odd - your ib_uverbs "Used by" list is empty. Did some
> module dependency cache force-load it? On my system, it doesn't
> load at all. With the proposed siw softdep, it does.

As I said, modern rdma-core auto-loads it on its own. There is no
module dependency causing it to load.

Jason