[Intel-wired-lan] [PATCH net] ice: Correctly deal with PFs that do not support RDMA

Jakub Kicinski kuba at kernel.org
Thu Sep 9 21:48:33 UTC 2021

On Thu,  9 Sep 2021 01:56:12 -0700 Dave Ertman wrote:
> There are two cases where the current PF does not support RDMA
> functionality.  The first is if the NVM loaded on the device is set
> to not support RDMA (common_caps.rdma is false).  The second is if
> the kernel bonding driver has included the current PF in an active
> link aggregate.
> When the driver has determined that this PF does not support RDMA, then
> auxiliary devices should not be created on the auxiliary bus.  Without
> a device on the auxiliary bus, even if the irdma driver is present, there
> will be no RDMA activity attempted on this PF.
> Currently, in the reset flow, an attempt to create auxiliary devices is
> performed without regard to the ability of the PF.  There needs to be a
> check in ice_aux_plug_dev (as the central point that creates auxiliary
> devices) to see if the PF is in a state to support the functionality.
> When disabling and re-enabling RDMA due to the inclusion/removal of the PF
> in a link aggregate, we also need to set/clear the bit which controls
> auxiliary device creation so that a reset recovery in a link aggregate
> situation doesn't try to create auxiliary devices when it shouldn't.
> Fixes: f9f5301e7e2d ("ice: Register auxiliary device to provide RDMA")
> Reported-by: Yongxin Liu <yongxin.liu at windriver.com>
> Signed-off-by: Dave Ertman <david.m.ertman at intel.com>
> Signed-off-by: Tony Nguyen <anthony.l.nguyen at intel.com>

Why CC lkml but not CC RDMA or Leon?

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