From 1450bc57d8ef47cda64c8ba4bbcd8ad22b74aa79 Mon Sep 17 00:00:00 2001
From: Tom Talpey <talpey@netapp.com>
Date: Thu, 9 Oct 2008 15:00:09 -0400
Subject: [PATCH] --- yaml --- r: 115410 b: refs/heads/master c:
 bd7ed1d13304d914648dacec4dbb9145aaae614e h: refs/heads/master v: v3

---
 [refs]                            |  2 +-
 trunk/net/sunrpc/xprtrdma/verbs.c | 95 ++++++++++++++++++++++++++-----
 2 files changed, 81 insertions(+), 16 deletions(-)

diff --git a/[refs] b/[refs]
index c5348a556edd..043c2865309a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: fe9053b30bb48b99f7b45541249f5cfe96bdf7f7
+refs/heads/master: bd7ed1d13304d914648dacec4dbb9145aaae614e
diff --git a/trunk/net/sunrpc/xprtrdma/verbs.c b/trunk/net/sunrpc/xprtrdma/verbs.c
index d04208a02f67..0f3b43148b7f 100644
--- a/trunk/net/sunrpc/xprtrdma/verbs.c
+++ b/trunk/net/sunrpc/xprtrdma/verbs.c
@@ -423,7 +423,8 @@ rpcrdma_clean_cq(struct ib_cq *cq)
 int
 rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
 {
-	int rc;
+	int rc, mem_priv;
+	struct ib_device_attr devattr;
 	struct rpcrdma_ia *ia = &xprt->rx_ia;
 
 	init_completion(&ia->ri_done);
@@ -442,6 +443,53 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
 		goto out2;
 	}
 
+	/*
+	 * Query the device to determine if the requested memory
+	 * registration strategy is supported. If it isn't, set the
+	 * strategy to a globally supported model.
+	 */
+	rc = ib_query_device(ia->ri_id->device, &devattr);
+	if (rc) {
+		dprintk("RPC:       %s: ib_query_device failed %d\n",
+			__func__, rc);
+		goto out2;
+	}
+
+	if (devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY) {
+		ia->ri_have_dma_lkey = 1;
+		ia->ri_dma_lkey = ia->ri_id->device->local_dma_lkey;
+	}
+
+	switch (memreg) {
+	case RPCRDMA_MEMWINDOWS:
+	case RPCRDMA_MEMWINDOWS_ASYNC:
+		if (!(devattr.device_cap_flags & IB_DEVICE_MEM_WINDOW)) {
+			dprintk("RPC:       %s: MEMWINDOWS registration "
+				"specified but not supported by adapter, "
+				"using slower RPCRDMA_REGISTER\n",
+				__func__);
+			memreg = RPCRDMA_REGISTER;
+		}
+		break;
+	case RPCRDMA_MTHCAFMR:
+		if (!ia->ri_id->device->alloc_fmr) {
+#if RPCRDMA_PERSISTENT_REGISTRATION
+			dprintk("RPC:       %s: MTHCAFMR registration "
+				"specified but not supported by adapter, "
+				"using riskier RPCRDMA_ALLPHYSICAL\n",
+				__func__);
+			memreg = RPCRDMA_ALLPHYSICAL;
+#else
+			dprintk("RPC:       %s: MTHCAFMR registration "
+				"specified but not supported by adapter, "
+				"using slower RPCRDMA_REGISTER\n",
+				__func__);
+			memreg = RPCRDMA_REGISTER;
+#endif
+		}
+		break;
+	}
+
 	/*
 	 * Optionally obtain an underlying physical identity mapping in
 	 * order to do a memory window-based bind. This base registration
@@ -450,22 +498,27 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
 	 * revoked after the corresponding completion similar to a storage
 	 * adapter.
 	 */
-	if (memreg > RPCRDMA_REGISTER) {
-		int mem_priv = IB_ACCESS_LOCAL_WRITE;
-		switch (memreg) {
+	switch (memreg) {
+	case RPCRDMA_BOUNCEBUFFERS:
+	case RPCRDMA_REGISTER:
+		break;
 #if RPCRDMA_PERSISTENT_REGISTRATION
-		case RPCRDMA_ALLPHYSICAL:
-			mem_priv |= IB_ACCESS_REMOTE_WRITE;
-			mem_priv |= IB_ACCESS_REMOTE_READ;
-			break;
+	case RPCRDMA_ALLPHYSICAL:
+		mem_priv = IB_ACCESS_LOCAL_WRITE |
+				IB_ACCESS_REMOTE_WRITE |
+				IB_ACCESS_REMOTE_READ;
+		goto register_setup;
 #endif
-		case RPCRDMA_MEMWINDOWS_ASYNC:
-		case RPCRDMA_MEMWINDOWS:
-			mem_priv |= IB_ACCESS_MW_BIND;
-			break;
-		default:
+	case RPCRDMA_MEMWINDOWS_ASYNC:
+	case RPCRDMA_MEMWINDOWS:
+		mem_priv = IB_ACCESS_LOCAL_WRITE |
+				IB_ACCESS_MW_BIND;
+		goto register_setup;
+	case RPCRDMA_MTHCAFMR:
+		if (ia->ri_have_dma_lkey)
 			break;
-		}
+		mem_priv = IB_ACCESS_LOCAL_WRITE;
+	register_setup:
 		ia->ri_bind_mem = ib_get_dma_mr(ia->ri_pd, mem_priv);
 		if (IS_ERR(ia->ri_bind_mem)) {
 			printk(KERN_ALERT "%s: ib_get_dma_mr for "
@@ -475,7 +528,15 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
 			memreg = RPCRDMA_REGISTER;
 			ia->ri_bind_mem = NULL;
 		}
+		break;
+	default:
+		printk(KERN_ERR "%s: invalid memory registration mode %d\n",
+				__func__, memreg);
+		rc = -EINVAL;
+		goto out2;
 	}
+	dprintk("RPC:       %s: memory registration strategy is %d\n",
+		__func__, memreg);
 
 	/* Else will do memory reg/dereg for each chunk */
 	ia->ri_memreg_strategy = memreg;
@@ -1248,7 +1309,11 @@ rpcrdma_register_internal(struct rpcrdma_ia *ia, void *va, int len,
 			va, len, DMA_BIDIRECTIONAL);
 	iov->length = len;
 
-	if (ia->ri_bind_mem != NULL) {
+	if (ia->ri_have_dma_lkey) {
+		*mrp = NULL;
+		iov->lkey = ia->ri_dma_lkey;
+		return 0;
+	} else if (ia->ri_bind_mem != NULL) {
 		*mrp = NULL;
 		iov->lkey = ia->ri_bind_mem->lkey;
 		return 0;