[ofa-general] [RFC,PATCH 03/10] rdma: SVCRMDA Header File
Tom Tucker
tom at opengridcomputing.com
Mon Aug 20 12:01:30 PDT 2007
This file defines the data types used by the SVCRDMA transport module.
The principle data structure is the transport specific extension to
the svcxprt structure.
Signed-off-by: Tom Tucker <tom at opengridcomputing.com>
---
include/linux/sunrpc/svc_rdma.h | 261 +++++++++++++++++++++++++++++++++++++++
1 files changed, 261 insertions(+), 0 deletions(-)
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
new file mode 100644
index 0000000..0bad94b
--- /dev/null
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -0,0 +1,261 @@
+/*
+ * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * Neither the name of the Network Appliance, Inc. nor the names of
+ * its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Author: Tom Tucker <tom at opengridcomputing.com>
+ */
+
+#ifndef SVC_RDMA_H
+#define SVC_RDMA_H
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/rpc_rdma.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#define SVCRDMA_DEBUG
+
+/* RPC/RDMA parameters */
+extern unsigned int svcrdma_ord;
+extern unsigned int svcrdma_max_requests;
+extern unsigned int svcrdma_max_req_size;
+extern unsigned int rdma_stat_recv;
+extern unsigned int rdma_stat_read;
+extern unsigned int rdma_stat_write;
+extern unsigned int rdma_stat_sq_starve;
+extern unsigned int rdma_stat_rq_starve;
+extern unsigned int rdma_stat_rq_poll;
+extern unsigned int rdma_stat_rq_prod;
+extern unsigned int rdma_stat_sq_poll;
+extern unsigned int rdma_stat_sq_prod;
+
+#define RPCRDMA_VERSION 1
+
+/*
+ * Contexts are built when an RDMA request is created and are a
+ * record of the resources that can be recovered when the request
+ * completes.
+ */
+struct svc_rdma_op_ctxt {
+ struct svc_rdma_op_ctxt *next;
+ struct xdr_buf arg;
+ struct list_head dto_q;
+ enum ib_wr_opcode wr_op;
+ enum ib_wc_status wc_status;
+ u32 byte_len;
+ struct svcxprt_rdma *xprt;
+ unsigned long flags;
+ enum dma_data_direction direction;
+ int count;
+ struct ib_sge sge[RPCSVC_MAXPAGES];
+ struct page *pages[RPCSVC_MAXPAGES];
+};
+
+#define RDMACTXT_F_READ_DONE 1
+#define RDMACTXT_F_LAST_CTXT 2
+
+struct svc_rdma_deferred_req {
+ struct svc_deferred_req req;
+ struct page *arg_page;
+ int arg_len;
+};
+
+struct svcxprt_rdma {
+ struct svc_sock sc_xprt; /* SVC transport structure */
+ struct rdma_cm_id *sc_cm_id; /* RDMA connection id */
+ struct list_head sc_accept_q; /* Conn. waiting accept */
+ int sc_ord; /* RDMA read limit */
+ wait_queue_head_t sc_read_wait;
+ int sc_max_sge;
+
+ int sc_sq_depth; /* Depth of SQ */
+ atomic_t sc_sq_count; /* Number of SQ WR on queue */
+
+ int sc_max_requests; /* Depth of RQ */
+ int sc_max_req_size; /* Size of each RQ WR buf */
+
+ struct ib_pd *sc_pd;
+
+ struct svc_rdma_op_ctxt *sc_ctxt_head;
+ int sc_ctxt_cnt;
+ int sc_ctxt_bump;
+ int sc_ctxt_max;
+ spinlock_t sc_ctxt_lock;
+ struct list_head sc_rq_dto_q;
+ spinlock_t sc_rq_dto_lock;
+ struct ib_qp *sc_qp;
+ struct ib_cq *sc_rq_cq;
+ struct ib_cq *sc_sq_cq;
+ struct ib_mr *sc_phys_mr; /* MR for server memory */
+
+ spinlock_t sc_lock;
+
+ wait_queue_head_t sc_send_wait; /* SQ exhaustion waitlist */
+ int sc_flags;
+ struct list_head sc_dto_q; /* DTO tasklet I/O pending */
+ struct list_head sc_read_complete_q;
+ spinlock_t sc_read_complete_lock;
+};
+/* sc_flags */
+#define RDMAXPRT_RQ_PENDING 1
+#define RDMAXPRT_SQ_PENDING 2
+
+#define RPCRDMA_LISTEN_BACKLOG 10
+/* The default ORD value is based on two outstanding full-size writes with a
+ * page size of 4k, or 32k * 2 ops / 4k = 16 outstanding RDMA_READ. */
+#define RPCRDMA_ORD (64/4)
+#define RPCRDMA_SQ_DEPTH_MULT 8
+#define RPCRDMA_MAX_THREADS 16
+#define RPCRDMA_MAX_REQUESTS 16
+#define RPCRDMA_MAX_REQ_SIZE 4096
+
+/* svc_rdma_marshal.c */
+extern void svc_rdma_rcl_chunk_counts(struct rpcrdma_read_chunk *, int *, int *);
+extern int svc_rdma_xdr_decode_req(struct rpcrdma_msg**, struct svc_rqst *);
+extern int svc_rdma_xdr_decode_deferred_req(struct svc_rqst *);
+extern int svc_rdma_xdr_encode_error(struct svcxprt_rdma*, struct rpcrdma_msg*,
+ enum rpcrdma_errcode, u32*);
+extern void svc_rdma_xdr_encode_write_list(struct rpcrdma_msg *, int);
+extern void svc_rdma_xdr_encode_reply_array(struct rpcrdma_write_array *, int);
+extern void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *, int,
+ u32, u64, u32);
+extern void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *,
+ struct rpcrdma_msg *,
+ struct rpcrdma_msg *,
+ enum rpcrdma_proc);
+extern int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *);
+
+/* svc_rdma_recvfrom.c */
+extern int svc_rdma_recvfrom(struct svc_rqst*);
+
+/* svc_rdma_sendto.c */
+extern int svc_rdma_sendto(struct svc_rqst*);
+
+/* svc_rdma_transport.c */
+extern int svc_rdma_send(struct svcxprt_rdma*, struct ib_send_wr*);
+extern int svc_rdma_send_error(struct svcxprt_rdma*, struct rpcrdma_msg*,
+ enum rpcrdma_errcode);
+struct page* svc_rdma_get_page(void);
+extern int svc_rdma_post_recv(struct svcxprt_rdma*);
+extern int svc_rdma_create_listen(struct svc_serv*, int, struct sockaddr*);
+extern struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *);
+extern void svc_rdma_put_context(struct svc_rdma_op_ctxt *, int);
+extern void svc_sq_reap(struct svcxprt_rdma*);
+extern void svc_rq_reap(struct svcxprt_rdma*);
+
+/* svc_rdma.c */
+extern int svc_rdma_init(void);
+extern void svc_rdma_cleanup(void);
+
+/*
+ * Returns the address of the first read chunk or <nul> if no read chunk is
+ * present
+ */
+static inline struct rpcrdma_read_chunk *
+svc_rdma_get_read_chunk(struct rpcrdma_msg *rmsgp)
+{
+ struct rpcrdma_read_chunk *ch =
+ (struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
+
+ if (ch->rc_discrim == 0)
+ return NULL;
+
+ return ch;
+}
+
+/*
+ * Returns the address of the first read write array element or <nul> if no
+ * write array list is present
+ */
+static inline struct rpcrdma_write_array *
+svc_rdma_get_write_array(struct rpcrdma_msg *rmsgp)
+{
+ if (rmsgp->rm_body.rm_chunks[0] != 0
+ || rmsgp->rm_body.rm_chunks[1] == 0)
+ return NULL;
+
+ return (struct rpcrdma_write_array *)&rmsgp->rm_body.rm_chunks[1];
+}
+
+/*
+ * Returns the address of the first reply array element or <nul> if no
+ * reply array is present
+ */
+static inline struct rpcrdma_write_array *
+svc_rdma_get_reply_array(struct rpcrdma_msg *rmsgp)
+{
+ struct rpcrdma_read_chunk *rch;
+ struct rpcrdma_write_array *wr_ary;
+ struct rpcrdma_write_array *rp_ary;
+
+ /* XXX: Need to fix when reply list may occur with read-list and/or
+ * write list */
+ if (rmsgp->rm_body.rm_chunks[0] != 0 ||
+ rmsgp->rm_body.rm_chunks[1] != 0)
+ return NULL;
+
+ rch = svc_rdma_get_read_chunk(rmsgp);
+ if (rch) {
+ while (rch->rc_discrim)
+ rch ++;
+
+ /* The reply list follows an empty write array located
+ * at 'rc_position' here. The reply array is at rc_target.
+ */
+ rp_ary = (struct rpcrdma_write_array*)&rch->rc_target;
+
+ goto found_it;
+ }
+
+ wr_ary = svc_rdma_get_write_array(rmsgp);
+ if (wr_ary) {
+ rp_ary = (struct rpcrdma_write_array*)
+ &wr_ary->wc_array[wr_ary->wc_nchunks].wc_target.rs_length;
+
+ goto found_it;
+ }
+
+ /* No read list, no write list */
+ rp_ary = (struct rpcrdma_write_array*)
+ &rmsgp->rm_body.rm_chunks[2];
+
+ found_it:
+ if (rp_ary->wc_discrim == 0)
+ return NULL;
+
+ return rp_ary;
+}
+#endif
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