xprtrdma: Aggregate the inline settings in struct rpcrdma_ep

Clean up.

The inline settings are actually a characteristic of the endpoint,
and not related to the device. They are also modified after the
transport instance is created, so they do not belong in the cdata
structure either.

Lastly, let's use names that are more natural to RDMA than to NFS:
inline_write -> inline_send and inline_read -> inline_recv. The
/proc files retain their names to avoid breaking user space.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/xprtrdma/backchannel.c

@@ -44,10 +44,10 @@ int xprt_rdma_bc_setup(struct rpc_xprt *xprt, unsigned int reqs)
 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *xprt)
 {
 	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
-	struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
+	struct rpcrdma_ep *ep = &r_xprt->rx_ep;
 	size_t maxmsg;
 
-	maxmsg = min_t(unsigned int, cdata->inline_rsize, cdata->inline_wsize);
+	maxmsg = min_t(unsigned int, ep->rep_inline_send, ep->rep_inline_recv);
 	maxmsg = min_t(unsigned int, maxmsg, PAGE_SIZE);
 	return maxmsg - RPCRDMA_HDRLEN_MIN;
 }
@@ -184,7 +184,7 @@ static struct rpc_rqst *rpcrdma_bc_rqst_get(struct rpcrdma_xprt *r_xprt)
 	if (xprt->bc_alloc_count >= RPCRDMA_BACKWARD_WRS)
 		return NULL;
 
-	size = min_t(size_t, r_xprt->rx_data.inline_rsize, PAGE_SIZE);
+	size = min_t(size_t, r_xprt->rx_ep.rep_inline_recv, PAGE_SIZE);
 	req = rpcrdma_req_create(r_xprt, size, GFP_KERNEL);
 	if (!req)
 		return NULL;

net/sunrpc/xprtrdma/rpc_rdma.c

@@ -105,16 +105,23 @@ static unsigned int rpcrdma_max_reply_header_size(unsigned int maxsegs)
 	return size;
 }
 
+/**
+ * rpcrdma_set_max_header_sizes - Initialize inline payload sizes
+ * @r_xprt: transport instance to initialize
+ *
+ * The max_inline fields contain the maximum size of an RPC message
+ * so the marshaling code doesn't have to repeat this calculation
+ * for every RPC.
+ */
 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *r_xprt)
 {
-	struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
-	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
-	unsigned int maxsegs = ia->ri_max_segs;
-
-	ia->ri_max_inline_write = cdata->inline_wsize -
-				  rpcrdma_max_call_header_size(maxsegs);
-	ia->ri_max_inline_read = cdata->inline_rsize -
-				 rpcrdma_max_reply_header_size(maxsegs);
+	unsigned int maxsegs = r_xprt->rx_ia.ri_max_segs;
+	struct rpcrdma_ep *ep = &r_xprt->rx_ep;
+
+	ep->rep_max_inline_send =
+		ep->rep_inline_send - rpcrdma_max_call_header_size(maxsegs);
+	ep->rep_max_inline_recv =
+		ep->rep_inline_recv - rpcrdma_max_reply_header_size(maxsegs);
 }
 
 /* The client can send a request inline as long as the RPCRDMA header
@@ -131,7 +138,7 @@ static bool rpcrdma_args_inline(struct rpcrdma_xprt *r_xprt,
 	struct xdr_buf *xdr = &rqst->rq_snd_buf;
 	unsigned int count, remaining, offset;
 
-	if (xdr->len > r_xprt->rx_ia.ri_max_inline_write)
+	if (xdr->len > r_xprt->rx_ep.rep_max_inline_send)
 		return false;
 
 	if (xdr->page_len) {
@@ -159,9 +166,7 @@ static bool rpcrdma_args_inline(struct rpcrdma_xprt *r_xprt,
 static bool rpcrdma_results_inline(struct rpcrdma_xprt *r_xprt,
 				   struct rpc_rqst *rqst)
 {
-	struct rpcrdma_ia *ia = &r_xprt->rx_ia;
-
-	return rqst->rq_rcv_buf.buflen <= ia->ri_max_inline_read;
+	return rqst->rq_rcv_buf.buflen <= r_xprt->rx_ep.rep_max_inline_recv;
 }
 
 /* The client is required to provide a Reply chunk if the maximum
@@ -173,10 +178,9 @@ rpcrdma_nonpayload_inline(const struct rpcrdma_xprt *r_xprt,
 			  const struct rpc_rqst *rqst)
 {
 	const struct xdr_buf *buf = &rqst->rq_rcv_buf;
-	const struct rpcrdma_ia *ia = &r_xprt->rx_ia;
 
-	return buf->head[0].iov_len + buf->tail[0].iov_len <
-		ia->ri_max_inline_read;
+	return (buf->head[0].iov_len + buf->tail[0].iov_len) <
+		r_xprt->rx_ep.rep_max_inline_recv;
 }
 
 /* Split @vec on page boundaries into SGEs. FMR registers pages, not

net/sunrpc/xprtrdma/transport.c

@@ -70,7 +70,7 @@
 
 static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE;
 unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE;
-static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
+unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
 unsigned int xprt_rdma_memreg_strategy		= RPCRDMA_FRWR;
 int xprt_rdma_pad_optimize;
 
@@ -350,8 +350,6 @@ xprt_setup_rdma(struct xprt_create *args)
 	xprt_rdma_format_addresses(xprt, sap);
 
 	cdata.max_requests = xprt_rdma_slot_table_entries;
-	cdata.inline_wsize = xprt_rdma_max_inline_write;
-	cdata.inline_rsize = xprt_rdma_max_inline_read;
 
 	/*
 	 * Create new transport instance, which includes initialized

net/sunrpc/xprtrdma/verbs.c

@@ -188,7 +188,6 @@ static void
 rpcrdma_update_connect_private(struct rpcrdma_xprt *r_xprt,
 			       struct rdma_conn_param *param)
 {
-	struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
 	const struct rpcrdma_connect_private *pmsg = param->private_data;
 	unsigned int rsize, wsize;
 
@@ -205,12 +204,13 @@ rpcrdma_update_connect_private(struct rpcrdma_xprt *r_xprt,
 		wsize = rpcrdma_decode_buffer_size(pmsg->cp_recv_size);
 	}
 
-	if (rsize < cdata->inline_rsize)
-		cdata->inline_rsize = rsize;
-	if (wsize < cdata->inline_wsize)
-		cdata->inline_wsize = wsize;
-	dprintk("RPC:       %s: max send %u, max recv %u\n",
-		__func__, cdata->inline_wsize, cdata->inline_rsize);
+	if (rsize < r_xprt->rx_ep.rep_inline_recv)
+		r_xprt->rx_ep.rep_inline_recv = rsize;
+	if (wsize < r_xprt->rx_ep.rep_inline_send)
+		r_xprt->rx_ep.rep_inline_send = wsize;
+	dprintk("RPC:       %s: max send %u, max recv %u\n", __func__,
+		r_xprt->rx_ep.rep_inline_send,
+		r_xprt->rx_ep.rep_inline_recv);
 	rpcrdma_set_max_header_sizes(r_xprt);
 }
 
@@ -488,6 +488,9 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
 	unsigned int max_sge;
 	int rc;
 
+	ep->rep_inline_send = xprt_rdma_max_inline_write;
+	ep->rep_inline_recv = xprt_rdma_max_inline_read;
+
 	max_sge = min_t(unsigned int, ia->ri_id->device->attrs.max_send_sge,
 			RPCRDMA_MAX_SEND_SGES);
 	if (max_sge < RPCRDMA_MIN_SEND_SGES) {
@@ -550,8 +553,8 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
 	pmsg->cp_magic = rpcrdma_cmp_magic;
 	pmsg->cp_version = RPCRDMA_CMP_VERSION;
 	pmsg->cp_flags |= RPCRDMA_CMP_F_SND_W_INV_OK;
-	pmsg->cp_send_size = rpcrdma_encode_buffer_size(cdata->inline_wsize);
-	pmsg->cp_recv_size = rpcrdma_encode_buffer_size(cdata->inline_rsize);
+	pmsg->cp_send_size = rpcrdma_encode_buffer_size(ep->rep_inline_send);
+	pmsg->cp_recv_size = rpcrdma_encode_buffer_size(ep->rep_inline_recv);
 	ep->rep_remote_cma.private_data = pmsg;
 	ep->rep_remote_cma.private_data_len = sizeof(*pmsg);
 
@@ -1045,7 +1048,6 @@ struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, size_t size,
 
 static bool rpcrdma_rep_create(struct rpcrdma_xprt *r_xprt, bool temp)
 {
-	struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
 	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
 	struct rpcrdma_rep *rep;
 
@@ -1053,7 +1055,7 @@ static bool rpcrdma_rep_create(struct rpcrdma_xprt *r_xprt, bool temp)
 	if (rep == NULL)
 		goto out;
 
-	rep->rr_rdmabuf = rpcrdma_regbuf_alloc(cdata->inline_rsize,
+	rep->rr_rdmabuf = rpcrdma_regbuf_alloc(r_xprt->rx_ep.rep_inline_recv,
 					       DMA_FROM_DEVICE, GFP_KERNEL);
 	if (!rep->rr_rdmabuf)
 		goto out_free;

net/sunrpc/xprtrdma/xprt_rdma.h

@@ -71,8 +71,6 @@ struct rpcrdma_ia {
 	int			ri_async_rc;
 	unsigned int		ri_max_segs;
 	unsigned int		ri_max_frwr_depth;
-	unsigned int		ri_max_inline_write;
-	unsigned int		ri_max_inline_read;
 	unsigned int		ri_max_send_sges;
 	bool			ri_implicit_roundup;
 	enum ib_mr_type		ri_mrtype;
@@ -92,11 +90,15 @@ enum {
 struct rpcrdma_ep {
 	unsigned int		rep_send_count;
 	unsigned int		rep_send_batch;
+	unsigned int		rep_max_inline_send;
+	unsigned int		rep_max_inline_recv;
 	int			rep_connected;
 	struct ib_qp_init_attr	rep_attr;
 	wait_queue_head_t 	rep_connect_wait;
 	struct rpcrdma_connect_private	rep_cm_private;
 	struct rdma_conn_param	rep_remote_cma;
+	unsigned int		rep_inline_send;	/* negotiated */
+	unsigned int		rep_inline_recv;	/* negotiated */
 	int			rep_receive_count;
 };
 
@@ -419,8 +421,6 @@ enum {
  */
 struct rpcrdma_create_data_internal {
 	unsigned int	max_requests;	/* max requests (slots) in flight */
-	unsigned int	inline_rsize;	/* max non-rdma read data payload */
-	unsigned int	inline_wsize;	/* max non-rdma write data payload */
 };
 
 /*
@@ -631,6 +631,7 @@ static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len)
 /* RPC/RDMA module init - xprtrdma/transport.c
  */
 extern unsigned int xprt_rdma_max_inline_read;
+extern unsigned int xprt_rdma_max_inline_write;
 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap);
 void xprt_rdma_free_addresses(struct rpc_xprt *xprt);
 void xprt_rdma_close(struct rpc_xprt *xprt);