WARNING on drivers/infiniband/core/verbs.c:1975 __ib_drain_sq+0x182/0x1c0 [ib_core]

[Sagi Grimberg]

> 2. Initiator side:
> #nvme connect-all -t rdma -a 172.31.40.4 -s 1023
>
> 3. check the kernel log on both target/initiator side.
>
> kernel log:
> [  242.494533] ocrdma0:Using VLAN with PFC is recommended
> [  242.520244] ocrdma0:Using VLAN 0 for this connection
> [  242.652599] ocrdma0:Using VLAN with PFC is recommended
> [  242.676365] ocrdma0:Using VLAN 0 for this connection
> [  242.700476] ocrdma0:Using VLAN with PFC is recommended
> [  242.723497] ocrdma0:Using VLAN 0 for this connection
> [  242.812331] nvme nvme0: new ctrl: NQN "nqn.2014-08.org.nvmexpress.discovery", addr 172.31.40.4:1023
> [  242.854149] ocrdma0:Using VLAN with PFC is recommended
> [  242.854149] ocrdma0:Using VLAN 0 for this connection
> [  242.854662] ------------[ cut here ]------------
> [  242.854671] WARNING: CPU: 2 PID: 158 at drivers/infiniband/core/verbs.c:1975 __ib_drain_sq+0x182/0x1c0 [ib_core]



I suspect that ib_drain_sq is not supported on ocrdma. From looking at
the code it seems that ocrdma fails and send post when the qp is not
in RTS. I think that if this is the case ocrdma needs to implement
its own qp drain logic similar to cxgb4, ns, i40e etc.

Devesh (CC'd), has anyone tested ib_drain_qp on ocrdma?