RDMA/rxe: Update wqe_index for each wqe error completion

Previously, if user space keeps sending abnormal wqe, queue.index will
keep increasing while qp->req.wqe_index doesn't. Once
qp->req.wqe_index==queue.index in next round, req_next_wqe() will treat
queue as empty. In such case, no new completion would be generated.

Update wqe_index for each wqe completion so that req_next_wqe() can get
next wqe properly.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Li Zhijian <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

drivers/infiniband/sw/rxe/rxe_req.c

@@ -802,6 +802,8 @@ int rxe_requester(void *arg)
 	ret = 0;
 	goto out;
 err:
+	/* update wqe_index for each wqe completion */
+	qp->req.wqe_index = queue_next_index(qp->sq.queue, qp->req.wqe_index);
 	wqe->state = wqe_state_error;
 	rxe_run_task(&qp->comp.task, 0);
 exit: