1 files changed, 71 insertions, 25 deletions

diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index fcc3eb80c265..b348b4adef29 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -56,6 +56,7 @@
 
 #define RPCDBG_FACILITY	RPCDBG_SVCXPRT
 
+static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *, int);
 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
 					struct net *net,
 					struct sockaddr *sa, int salen,
@@ -95,6 +96,63 @@ struct svc_xprt_class svc_rdma_class = {
 	.xcl_ident = XPRT_TRANSPORT_RDMA,
 };
 
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *, struct net *,
+					   struct sockaddr *, int, int);
+static void svc_rdma_bc_detach(struct svc_xprt *);
+static void svc_rdma_bc_free(struct svc_xprt *);
+
+static struct svc_xprt_ops svc_rdma_bc_ops = {
+	.xpo_create = svc_rdma_bc_create,
+	.xpo_detach = svc_rdma_bc_detach,
+	.xpo_free = svc_rdma_bc_free,
+	.xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
+	.xpo_secure_port = svc_rdma_secure_port,
+};
+
+struct svc_xprt_class svc_rdma_bc_class = {
+	.xcl_name = "rdma-bc",
+	.xcl_owner = THIS_MODULE,
+	.xcl_ops = &svc_rdma_bc_ops,
+	.xcl_max_payload = (1024 - RPCRDMA_HDRLEN_MIN)
+};
+
+static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *serv,
+					   struct net *net,
+					   struct sockaddr *sa, int salen,
+					   int flags)
+{
+	struct svcxprt_rdma *cma_xprt;
+	struct svc_xprt *xprt;
+
+	cma_xprt = rdma_create_xprt(serv, 0);
+	if (!cma_xprt)
+		return ERR_PTR(-ENOMEM);
+	xprt = &cma_xprt->sc_xprt;
+
+	svc_xprt_init(net, &svc_rdma_bc_class, xprt, serv);
+	serv->sv_bc_xprt = xprt;
+
+	dprintk("svcrdma: %s(%p)\n", __func__, xprt);
+	return xprt;
+}
+
+static void svc_rdma_bc_detach(struct svc_xprt *xprt)
+{
+	dprintk("svcrdma: %s(%p)\n", __func__, xprt);
+}
+
+static void svc_rdma_bc_free(struct svc_xprt *xprt)
+{
+	struct svcxprt_rdma *rdma =
+		container_of(xprt, struct svcxprt_rdma, sc_xprt);
+
+	dprintk("svcrdma: %s(%p)\n", __func__, xprt);
+	if (xprt)
+		kfree(rdma);
+}
+#endif	/* CONFIG_SUNRPC_BACKCHANNEL */
+
 struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
 {
 	struct svc_rdma_op_ctxt *ctxt;
@@ -692,8 +750,8 @@ static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
 	if (!cma_xprt)
 		return ERR_PTR(-ENOMEM);
 
-	listen_id = rdma_create_id(rdma_listen_handler, cma_xprt, RDMA_PS_TCP,
-				   IB_QPT_RC);
+	listen_id = rdma_create_id(&init_net, rdma_listen_handler, cma_xprt,
+				   RDMA_PS_TCP, IB_QPT_RC);
 	if (IS_ERR(listen_id)) {
 		ret = PTR_ERR(listen_id);
 		dprintk("svcrdma: rdma_create_id failed = %d\n", ret);
@@ -732,7 +790,7 @@ static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
 static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt)
 {
 	struct ib_mr *mr;
-	struct ib_fast_reg_page_list *pl;
+	struct scatterlist *sg;
 	struct svc_rdma_fastreg_mr *frmr;
 	u32 num_sg;
 
@@ -745,13 +803,14 @@ static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt)
 	if (IS_ERR(mr))
 		goto err_free_frmr;
 
-	pl = ib_alloc_fast_reg_page_list(xprt->sc_cm_id->device,
-					 num_sg);
-	if (IS_ERR(pl))
+	sg = kcalloc(RPCSVC_MAXPAGES, sizeof(*sg), GFP_KERNEL);
+	if (!sg)
 		goto err_free_mr;
 
+	sg_init_table(sg, RPCSVC_MAXPAGES);
+
 	frmr->mr = mr;
-	frmr->page_list = pl;
+	frmr->sg = sg;
 	INIT_LIST_HEAD(&frmr->frmr_list);
 	return frmr;
 
@@ -771,8 +830,8 @@ static void rdma_dealloc_frmr_q(struct svcxprt_rdma *xprt)
 		frmr = list_entry(xprt->sc_frmr_q.next,
 				  struct svc_rdma_fastreg_mr, frmr_list);
 		list_del_init(&frmr->frmr_list);
+		kfree(frmr->sg);
 		ib_dereg_mr(frmr->mr);
-		ib_free_fast_reg_page_list(frmr->page_list);
 		kfree(frmr);
 	}
 }
@@ -786,8 +845,7 @@ struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma)
 		frmr = list_entry(rdma->sc_frmr_q.next,
 				  struct svc_rdma_fastreg_mr, frmr_list);
 		list_del_init(&frmr->frmr_list);
-		frmr->map_len = 0;
-		frmr->page_list_len = 0;
+		frmr->sg_nents = 0;
 	}
 	spin_unlock_bh(&rdma->sc_frmr_q_lock);
 	if (frmr)
@@ -796,25 +854,13 @@ struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma)
 	return rdma_alloc_frmr(rdma);
 }
 
-static void frmr_unmap_dma(struct svcxprt_rdma *xprt,
-			   struct svc_rdma_fastreg_mr *frmr)
-{
-	int page_no;
-	for (page_no = 0; page_no < frmr->page_list_len; page_no++) {
-		dma_addr_t addr = frmr->page_list->page_list[page_no];
-		if (ib_dma_mapping_error(frmr->mr->device, addr))
-			continue;
-		atomic_dec(&xprt->sc_dma_used);
-		ib_dma_unmap_page(frmr->mr->device, addr, PAGE_SIZE,
-				  frmr->direction);
-	}
-}
-
 void svc_rdma_put_frmr(struct svcxprt_rdma *rdma,
 		       struct svc_rdma_fastreg_mr *frmr)
 {
 	if (frmr) {
-		frmr_unmap_dma(rdma, frmr);
+		ib_dma_unmap_sg(rdma->sc_cm_id->device,
+				frmr->sg, frmr->sg_nents, frmr->direction);
+		atomic_dec(&rdma->sc_dma_used);
 		spin_lock_bh(&rdma->sc_frmr_q_lock);
 		WARN_ON_ONCE(!list_empty(&frmr->frmr_list));
 		list_add(&frmr->frmr_list, &rdma->sc_frmr_q);