xprtrdma: Release orphaned MRs immediately

Instead of leaving orphaned MRs to be released when the transport
is destroyed, release them immediately. The MR free list can now be
replenished if it becomes exhausted.

Signed-off-by: Chuck Lever <[email protected]>
Tested-by: Steve Wise <[email protected]>
Signed-off-by: Anna Schumaker <[email protected]>

Author: chucklever

net/sunrpc/xprtrdma/fmr_ops.c

@@ -134,15 +134,22 @@ fmr_op_recover_mr(struct rpcrdma_mw *mw)
 	/* ORDER: then DMA unmap */
 	ib_dma_unmap_sg(r_xprt->rx_ia.ri_device,
 			mw->mw_sg, mw->mw_nents, mw->mw_dir);
-	if (rc) {
-		pr_err("rpcrdma: FMR reset status %d, %p orphaned\n",
-		       rc, mw);
-		r_xprt->rx_stats.mrs_orphaned++;
-		return;
-	}
+	if (rc)
+		goto out_release;
 
 	rpcrdma_put_mw(r_xprt, mw);
 	r_xprt->rx_stats.mrs_recovered++;
+	return;
+
+out_release:
+	pr_err("rpcrdma: FMR reset failed (%d), %p released\n", rc, mw);
+	r_xprt->rx_stats.mrs_orphaned++;
+
+	spin_lock(&r_xprt->rx_buf.rb_mwlock);
+	list_del(&mw->mw_all);
+	spin_unlock(&r_xprt->rx_buf.rb_mwlock);
+
+	fmr_op_release_mr(mw);
 }
 
 static int

net/sunrpc/xprtrdma/frwr_ops.c

@@ -177,15 +177,22 @@ frwr_op_recover_mr(struct rpcrdma_mw *mw)
 
 	rc = __frwr_reset_mr(ia, mw);
 	ib_dma_unmap_sg(ia->ri_device, mw->mw_sg, mw->mw_nents, mw->mw_dir);
-	if (rc) {
-		pr_err("rpcrdma: FRMR reset status %d, %p orphaned\n",
-		       rc, mw);
-		r_xprt->rx_stats.mrs_orphaned++;
-		return;
-	}
+	if (rc)
+		goto out_release;
 
 	rpcrdma_put_mw(r_xprt, mw);
 	r_xprt->rx_stats.mrs_recovered++;
+	return;
+
+out_release:
+	pr_err("rpcrdma: FRMR reset failed %d, %p release\n", rc, mw);
+	r_xprt->rx_stats.mrs_orphaned++;
+
+	spin_lock(&r_xprt->rx_buf.rb_mwlock);
+	list_del(&mw->mw_all);
+	spin_unlock(&r_xprt->rx_buf.rb_mwlock);
+
+	frwr_op_release_mr(mw);
 }
 
 static int