xprtrdma: Add "open" memreg op

The open op determines the size of various transport data structures
based on device capabilities and memory registration mode.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Devesh Sharma <Devesh.Sharma@Emulex.Com>
Tested-by: Meghana Cheripady <Meghana.Cheripady@Emulex.Com>
Tested-by: Veeresh U. Kokatnur <veereshuk@chelsio.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

5 files changed, 70 insertions, 46 deletions

diff --git a/net/sunrpc/xprtrdma/fmr_ops.c b/net/sunrpc/xprtrdma/fmr_ops.c
index e9ca5944ac1e..e8a9837f8d63 100644
--- a/net/sunrpc/xprtrdma/fmr_ops.c
+++ b/net/sunrpc/xprtrdma/fmr_ops.c
@@ -20,6 +20,13 @@
 /* Maximum scatter/gather per FMR */
 #define RPCRDMA_MAX_FMR_SGES    (64)
 
+static int
+fmr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
+            struct rpcrdma_create_data_internal *cdata)
+{
+        return 0;
+}
+
 /* FMR mode conveys up to 64 pages of payload per chunk segment.
  */
 static size_t
@@ -188,6 +195,7 @@ fmr_op_destroy(struct rpcrdma_buffer *buf)
 const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops = {
         .ro_map                         = fmr_op_map,
         .ro_unmap                       = fmr_op_unmap,
+        .ro_open                        = fmr_op_open,
         .ro_maxpages                    = fmr_op_maxpages,
         .ro_init                        = fmr_op_init,
         .ro_reset                       = fmr_op_reset,
diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index 121e400d0565..e17d54d473a7 100644
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -58,6 +58,53 @@ __frwr_release(struct rpcrdma_mw *r)
         ib_free_fast_reg_page_list(r->r.frmr.fr_pgl);
 }
 
+static int
+frwr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
+             struct rpcrdma_create_data_internal *cdata)
+{
+        struct ib_device_attr *devattr = &ia->ri_devattr;
+        int depth, delta;
+
+        ia->ri_max_frmr_depth =
+                        min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
+                              devattr->max_fast_reg_page_list_len);
+        dprintk("RPC:       %s: device's max FR page list len = %u\n",
+                __func__, ia->ri_max_frmr_depth);
+
+        /* Add room for frmr register and invalidate WRs.
+         * 1. FRMR reg WR for head
+         * 2. FRMR invalidate WR for head
+         * 3. N FRMR reg WRs for pagelist
+         * 4. N FRMR invalidate WRs for pagelist
+         * 5. FRMR reg WR for tail
+         * 6. FRMR invalidate WR for tail
+         * 7. The RDMA_SEND WR
+         */
+        depth = 7;
+
+        /* Calculate N if the device max FRMR depth is smaller than
+         * RPCRDMA_MAX_DATA_SEGS.
+         */
+        if (ia->ri_max_frmr_depth < RPCRDMA_MAX_DATA_SEGS) {
+                delta = RPCRDMA_MAX_DATA_SEGS - ia->ri_max_frmr_depth;
+                do {
+                        depth += 2; /* FRMR reg + invalidate */
+                        delta -= ia->ri_max_frmr_depth;
+                } while (delta > 0);
+        }
+
+        ep->rep_attr.cap.max_send_wr *= depth;
+        if (ep->rep_attr.cap.max_send_wr > devattr->max_qp_wr) {
+                cdata->max_requests = devattr->max_qp_wr / depth;
+                if (!cdata->max_requests)
+                        return -EINVAL;
+                ep->rep_attr.cap.max_send_wr = cdata->max_requests *
+                                               depth;
+        }
+
+        return 0;
+}
+
 /* FRWR mode conveys a list of pages per chunk segment. The
  * maximum length of that list is the FRWR page list depth.
  */
@@ -276,6 +323,7 @@ frwr_op_destroy(struct rpcrdma_buffer *buf)
 const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops = {
         .ro_map                         = frwr_op_map,
         .ro_unmap                       = frwr_op_unmap,
+        .ro_open                        = frwr_op_open,
         .ro_maxpages                    = frwr_op_maxpages,
         .ro_init                        = frwr_op_init,
         .ro_reset                       = frwr_op_reset,
diff --git a/net/sunrpc/xprtrdma/physical_ops.c b/net/sunrpc/xprtrdma/physical_ops.c
index eb39011e3129..0ba130bed1fc 100644
--- a/net/sunrpc/xprtrdma/physical_ops.c
+++ b/net/sunrpc/xprtrdma/physical_ops.c
@@ -19,6 +19,13 @@
 # define RPCDBG_FACILITY        RPCDBG_TRANS
 #endif
 
+static int
+physical_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
+                 struct rpcrdma_create_data_internal *cdata)
+{
+        return 0;
+}
+
 /* PHYSICAL memory registration conveys one page per chunk segment.
  */
 static size_t
@@ -72,6 +79,7 @@ physical_op_destroy(struct rpcrdma_buffer *buf)
 const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops = {
         .ro_map                         = physical_op_map,
         .ro_unmap                       = physical_op_unmap,
+        .ro_open                        = physical_op_open,
         .ro_maxpages                    = physical_op_maxpages,
         .ro_init                        = physical_op_init,
         .ro_reset                       = physical_op_reset,
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index a7fb31441069..b697b3ed6273 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -622,11 +622,6 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
                         dprintk("RPC:       %s: FRMR registration "
                                 "not supported by HCA\n", __func__);
                         memreg = RPCRDMA_MTHCAFMR;
-                } else {
-                        /* Mind the ia limit on FRMR page list depth */
-                        ia->ri_max_frmr_depth = min_t(unsigned int,
-                                RPCRDMA_MAX_DATA_SEGS,
-                                devattr->max_fast_reg_page_list_len);
                 }
         }
         if (memreg == RPCRDMA_MTHCAFMR) {
@@ -741,49 +736,11 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
 
         ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall;
         ep->rep_attr.qp_context = ep;
-        /* send_cq and recv_cq initialized below */
         ep->rep_attr.srq = NULL;
         ep->rep_attr.cap.max_send_wr = cdata->max_requests;
-        switch (ia->ri_memreg_strategy) {
-        case RPCRDMA_FRMR: {
-                int depth = 7;
-
-                /* Add room for frmr register and invalidate WRs.
-                 * 1. FRMR reg WR for head
-                 * 2. FRMR invalidate WR for head
-                 * 3. N FRMR reg WRs for pagelist
-                 * 4. N FRMR invalidate WRs for pagelist
-                 * 5. FRMR reg WR for tail
-                 * 6. FRMR invalidate WR for tail
-                 * 7. The RDMA_SEND WR
-                 */
-
-                /* Calculate N if the device max FRMR depth is smaller than
-                 * RPCRDMA_MAX_DATA_SEGS.
-                 */
-                if (ia->ri_max_frmr_depth < RPCRDMA_MAX_DATA_SEGS) {
-                        int delta = RPCRDMA_MAX_DATA_SEGS -
-                                    ia->ri_max_frmr_depth;
-
-                        do {
-                                depth += 2; /* FRMR reg + invalidate */
-                                delta -= ia->ri_max_frmr_depth;
-                        } while (delta > 0);
-
-                }
-                ep->rep_attr.cap.max_send_wr *= depth;
-                if (ep->rep_attr.cap.max_send_wr > devattr->max_qp_wr) {
-                        cdata->max_requests = devattr->max_qp_wr / depth;
-                        if (!cdata->max_requests)
-                                return -EINVAL;
-                        ep->rep_attr.cap.max_send_wr = cdata->max_requests *
-                                                       depth;
-                }
-                break;
-        }
-        default:
-                break;
-        }
+        rc = ia->ri_ops->ro_open(ia, ep, cdata);
+        if (rc)
+                return rc;
         ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
         ep->rep_attr.cap.max_send_sge = (cdata->padding ? 4 : 2);
         ep->rep_attr.cap.max_recv_sge = 1;
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index b95e223d3d69..9036fb4174d5 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -340,6 +340,9 @@ struct rpcrdma_memreg_ops {
                                   struct rpcrdma_mr_seg *, int, bool);
         int             (*ro_unmap)(struct rpcrdma_xprt *,
                                     struct rpcrdma_mr_seg *);
+        int             (*ro_open)(struct rpcrdma_ia *,
+                                   struct rpcrdma_ep *,
+                                   struct rpcrdma_create_data_internal *);
         size_t          (*ro_maxpages)(struct rpcrdma_xprt *);
         int             (*ro_init)(struct rpcrdma_xprt *);
         void            (*ro_reset)(struct rpcrdma_xprt *);