xprtrdma: Add a "max_payload" op for each memreg mode

The max_payload computation is generalized to ensure that the
payload maximum is the lesser of RPC_MAX_DATA_SEGS and the number of
data segments that can be transmitted in an inline buffer.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.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>

6 files changed, 59 insertions, 36 deletions

diff --git a/net/sunrpc/xprtrdma/fmr_ops.c b/net/sunrpc/xprtrdma/fmr_ops.c
index ffb7d9358480..eec266055b28 100644
--- a/net/sunrpc/xprtrdma/fmr_ops.c
+++ b/net/sunrpc/xprtrdma/fmr_ops.c
@@ -17,6 +17,19 @@
 # define RPCDBG_FACILITY        RPCDBG_TRANS
 #endif
 
+/* Maximum scatter/gather per FMR */
+#define RPCRDMA_MAX_FMR_SGES    (64)
+
+/* FMR mode conveys up to 64 pages of payload per chunk segment.
+ */
+static size_t
+fmr_op_maxpages(struct rpcrdma_xprt *r_xprt)
+{
+        return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
+                     rpcrdma_max_segments(r_xprt) * RPCRDMA_MAX_FMR_SGES);
+}
+
 const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops = {
+        .ro_maxpages                    = fmr_op_maxpages,
         .ro_displayname                 = "fmr",
 };
diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index 79173f98e09a..73a5ac898efc 100644
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -17,6 +17,19 @@
 # define RPCDBG_FACILITY        RPCDBG_TRANS
 #endif
 
+/* FRWR mode conveys a list of pages per chunk segment. The
+ * maximum length of that list is the FRWR page list depth.
+ */
+static size_t
+frwr_op_maxpages(struct rpcrdma_xprt *r_xprt)
+{
+        struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+
+        return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
+                     rpcrdma_max_segments(r_xprt) * ia->ri_max_frmr_depth);
+}
+
 const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops = {
+        .ro_maxpages                    = frwr_op_maxpages,
         .ro_displayname                 = "frwr",
 };
diff --git a/net/sunrpc/xprtrdma/physical_ops.c b/net/sunrpc/xprtrdma/physical_ops.c
index b0922accabcf..28ade1943a57 100644
--- a/net/sunrpc/xprtrdma/physical_ops.c
+++ b/net/sunrpc/xprtrdma/physical_ops.c
@@ -19,6 +19,16 @@
 # define RPCDBG_FACILITY        RPCDBG_TRANS
 #endif
 
+/* PHYSICAL memory registration conveys one page per chunk segment.
+ */
+static size_t
+physical_op_maxpages(struct rpcrdma_xprt *r_xprt)
+{
+        return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
+                     rpcrdma_max_segments(r_xprt));
+}
+
 const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops = {
+        .ro_maxpages                    = physical_op_maxpages,
         .ro_displayname                 = "physical",
 };
diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
index 97f656292feb..da71a24641e3 100644
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -406,7 +406,10 @@ xprt_setup_rdma(struct xprt_create *args)
                           xprt_rdma_connect_worker);
 
         xprt_rdma_format_addresses(xprt);
-        xprt->max_payload = rpcrdma_max_payload(new_xprt);
+        xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt);
+        if (xprt->max_payload == 0)
+                goto out4;
+        xprt->max_payload <<= PAGE_SHIFT;
         dprintk("RPC:       %s: transport data payload maximum: %zu bytes\n",
                 __func__, xprt->max_payload);
 
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index c3319e12551c..da55cda30568 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -2212,43 +2212,24 @@ rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
         return rc;
 }
 
-/* Physical mapping means one Read/Write list entry per-page.
- * All list entries must fit within an inline buffer
- *
- * NB: The server must return a Write list for NFS READ,
- *     which has the same constraint. Factor in the inline
- *     rsize as well.
+/* How many chunk list items fit within our inline buffers?
  */
-static size_t
-rpcrdma_physical_max_payload(struct rpcrdma_xprt *r_xprt)
+unsigned int
+rpcrdma_max_segments(struct rpcrdma_xprt *r_xprt)
 {
         struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
-        unsigned int inline_size, pages;
-
-        inline_size = min_t(unsigned int,
-                            cdata->inline_wsize, cdata->inline_rsize);
-        inline_size -= RPCRDMA_HDRLEN_MIN;
-        pages = inline_size / sizeof(struct rpcrdma_segment);
-        return pages << PAGE_SHIFT;
-}
+        int bytes, segments;
 
-static size_t
-rpcrdma_mr_max_payload(struct rpcrdma_xprt *r_xprt)
-{
-        return RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT;
-}
-
-size_t
-rpcrdma_max_payload(struct rpcrdma_xprt *r_xprt)
-{
-        size_t result;
-
-        switch (r_xprt->rx_ia.ri_memreg_strategy) {
-        case RPCRDMA_ALLPHYSICAL:
-                result = rpcrdma_physical_max_payload(r_xprt);
-                break;
-        default:
-                result = rpcrdma_mr_max_payload(r_xprt);
+        bytes = min_t(unsigned int, cdata->inline_wsize, cdata->inline_rsize);
+        bytes -= RPCRDMA_HDRLEN_MIN;
+        if (bytes < sizeof(struct rpcrdma_segment) * 2) {
+                pr_warn("RPC:       %s: inline threshold too small\n",
+                        __func__);
+                return 0;
         }
-        return result;
+
+        segments = 1 << (fls(bytes / sizeof(struct rpcrdma_segment)) - 1);
+        dprintk("RPC:       %s: max chunk list size = %d segments\n",
+                __func__, segments);
+        return segments;
 }
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index ef3cf4aeecd6..59e627e96a0b 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -334,7 +334,9 @@ struct rpcrdma_stats {
 /*
  * Per-registration mode operations
  */
+struct rpcrdma_xprt;
 struct rpcrdma_memreg_ops {
+        size_t          (*ro_maxpages)(struct rpcrdma_xprt *);
         const char      *ro_displayname;
 };
 
@@ -411,6 +413,8 @@ struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(struct rpcrdma_ia *,
 void rpcrdma_free_regbuf(struct rpcrdma_ia *,
                          struct rpcrdma_regbuf *);
 
+unsigned int rpcrdma_max_segments(struct rpcrdma_xprt *);
+
 /*
  * RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c
  */
@@ -422,7 +426,6 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *);
  * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
  */
 int rpcrdma_marshal_req(struct rpc_rqst *);
-size_t rpcrdma_max_payload(struct rpcrdma_xprt *);
 
 /* Temporary NFS request map cache. Created in svc_rdma.c  */
 extern struct kmem_cache *svc_rdma_map_cachep;