xprtrdma: Disable completions for LOCAL_INV Work Requests

Instead of relying on a completion to change the state of an FRMR
to FRMR_IS_INVALID, set it in advance. If an error occurs, a completion
will fire anyway and mark the FRMR FRMR_IS_STALE.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Tested-by: Shirley Ma <shirley.ma@oracle.com>
Tested-by: Devesh Sharma <devesh.sharma@emulex.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/xprtrdma/verbs.c

@@ -154,12 +154,8 @@ rpcrdma_sendcq_process_wc(struct ib_wc *wc)
 
 	if (wc->wr_id == 0ULL)
 		return;
-	if (wc->status != IB_WC_SUCCESS) {
+	if (wc->status != IB_WC_SUCCESS)
 		frmr->r.frmr.fr_state = FRMR_IS_STALE;
-		return;
-	}
-
-	frmr->r.frmr.fr_state = FRMR_IS_INVALID;
 }
 
 static int
@@ -1369,12 +1365,11 @@ rpcrdma_retry_local_inv(struct rpcrdma_mw *r, struct rpcrdma_ia *ia)
 	dprintk("RPC:       %s: FRMR %p is stale\n", __func__, r);
 
 	/* When this FRMR is re-inserted into rb_mws, it is no longer stale */
-	r->r.frmr.fr_state = FRMR_IS_VALID;
+	r->r.frmr.fr_state = FRMR_IS_INVALID;
 
 	memset(&invalidate_wr, 0, sizeof(invalidate_wr));
 	invalidate_wr.wr_id = (unsigned long)(void *)r;
 	invalidate_wr.opcode = IB_WR_LOCAL_INV;
-	invalidate_wr.send_flags = IB_SEND_SIGNALED;
 	invalidate_wr.ex.invalidate_rkey = r->r.frmr.fr_mr->rkey;
 	DECR_CQCOUNT(&r_xprt->rx_ep);
 
@@ -1778,10 +1773,11 @@ rpcrdma_deregister_frmr_external(struct rpcrdma_mr_seg *seg,
 	struct ib_send_wr invalidate_wr, *bad_wr;
 	int rc;
 
+	seg1->mr_chunk.rl_mw->r.frmr.fr_state = FRMR_IS_INVALID;
+
 	memset(&invalidate_wr, 0, sizeof invalidate_wr);
 	invalidate_wr.wr_id = (unsigned long)(void *)seg1->mr_chunk.rl_mw;
 	invalidate_wr.opcode = IB_WR_LOCAL_INV;
-	invalidate_wr.send_flags = IB_SEND_SIGNALED;
 	invalidate_wr.ex.invalidate_rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey;
 	DECR_CQCOUNT(&r_xprt->rx_ep);
 
@@ -1790,9 +1786,12 @@ rpcrdma_deregister_frmr_external(struct rpcrdma_mr_seg *seg,
 		rpcrdma_unmap_one(ia, seg++);
 	rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr);
 	read_unlock(&ia->ri_qplock);
-	if (rc)
+	if (rc) {
+		/* Force rpcrdma_buffer_get() to retry */
+		seg1->mr_chunk.rl_mw->r.frmr.fr_state = FRMR_IS_STALE;
 		dprintk("RPC:       %s: failed ib_post_send for invalidate,"
 			" status %i\n", __func__, rc);
+	}
 	return rc;
 }