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9p: rdma: RDMA Transport Support for 9P
This patch implements the RDMA transport provider for 9P. It allows mounts to be performed over iWARP and IB capable network interfaces. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Signed-off-by: Latchesar Ionkov <lionkov@lanl.gov>
This commit is contained in:
Tom Tucker
Eric Van Hensbergen
parent
ea2e7996fc
commit
fc79d4b104
4 changed files with 723 additions and 0 deletions
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@ -206,6 +206,7 @@ int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst);
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struct p9_req_t *p9_tag_lookup(struct p9_client *, u16);
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struct p9_req_t *p9_tag_lookup(struct p9_client *, u16);
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void p9_client_cb(struct p9_client *c, struct p9_req_t *req);
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void p9_client_cb(struct p9_client *c, struct p9_req_t *req);
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int p9_parse_header(struct p9_fcall *, int32_t *, int8_t *, int16_t *, int);
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int p9stat_read(char *, int, struct p9_wstat *, int);
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int p9stat_read(char *, int, struct p9_wstat *, int);
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void p9stat_free(struct p9_wstat *);
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void p9stat_free(struct p9_wstat *);
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@ -20,6 +20,12 @@ config NET_9P_VIRTIO
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This builds support for a transports between
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This builds support for a transports between
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guest partitions and a host partition.
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guest partitions and a host partition.
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config NET_9P_RDMA
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depends on NET_9P && INFINIBAND && EXPERIMENTAL
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tristate "9P RDMA Transport (Experimental)"
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help
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This builds support for a RDMA transport.
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config NET_9P_DEBUG
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config NET_9P_DEBUG
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bool "Debug information"
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bool "Debug information"
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depends on NET_9P
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depends on NET_9P
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@ -1,5 +1,6 @@
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obj-$(CONFIG_NET_9P) := 9pnet.o
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obj-$(CONFIG_NET_9P) := 9pnet.o
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obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
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obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
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obj-$(CONFIG_NET_9P_RDMA) += 9pnet_rdma.o
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9pnet-objs := \
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9pnet-objs := \
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mod.o \
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mod.o \
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@ -11,3 +12,6 @@ obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
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9pnet_virtio-objs := \
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9pnet_virtio-objs := \
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trans_virtio.o \
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trans_virtio.o \
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9pnet_rdma-objs := \
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trans_rdma.o \
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712
net/9p/trans_rdma.c
Normal file
712
net/9p/trans_rdma.c
Normal file
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@ -0,0 +1,712 @@
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/*
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* linux/fs/9p/trans_rdma.c
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*
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* RDMA transport layer based on the trans_fd.c implementation.
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*
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* Copyright (C) 2008 by Tom Tucker <tom@opengridcomputing.com>
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* Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
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* Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
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* Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/in.h>
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/ipv6.h>
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#include <linux/kthread.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/un.h>
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#include <linux/uaccess.h>
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#include <linux/inet.h>
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#include <linux/idr.h>
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#include <linux/file.h>
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#include <linux/parser.h>
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#include <linux/semaphore.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include <net/9p/transport.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#include <rdma/ib_verbs.h>
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#define P9_PORT 5640
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#define P9_RDMA_SQ_DEPTH 32
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#define P9_RDMA_RQ_DEPTH 32
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#define P9_RDMA_SEND_SGE 4
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#define P9_RDMA_RECV_SGE 4
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#define P9_RDMA_IRD 0
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#define P9_RDMA_ORD 0
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#define P9_RDMA_TIMEOUT 30000 /* 30 seconds */
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#define P9_RDMA_MAXSIZE (4*4096) /* Min SGE is 4, so we can
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* safely advertise a maxsize
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* of 64k */
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#define P9_RDMA_MAX_SGE (P9_RDMA_MAXSIZE >> PAGE_SHIFT)
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/**
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* struct p9_trans_rdma - RDMA transport instance
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*
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* @state: tracks the transport state machine for connection setup and tear down
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* @cm_id: The RDMA CM ID
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* @pd: Protection Domain pointer
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* @qp: Queue Pair pointer
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* @cq: Completion Queue pointer
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* @lkey: The local access only memory region key
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* @timeout: Number of uSecs to wait for connection management events
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* @sq_depth: The depth of the Send Queue
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* @sq_sem: Semaphore for the SQ
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* @rq_depth: The depth of the Receive Queue.
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* @addr: The remote peer's address
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* @req_lock: Protects the active request list
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* @send_wait: Wait list when the SQ fills up
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* @cm_done: Completion event for connection management tracking
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*/
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struct p9_trans_rdma {
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enum {
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P9_RDMA_INIT,
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P9_RDMA_ADDR_RESOLVED,
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P9_RDMA_ROUTE_RESOLVED,
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P9_RDMA_CONNECTED,
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P9_RDMA_FLUSHING,
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P9_RDMA_CLOSING,
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P9_RDMA_CLOSED,
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} state;
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struct rdma_cm_id *cm_id;
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struct ib_pd *pd;
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struct ib_qp *qp;
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struct ib_cq *cq;
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struct ib_mr *dma_mr;
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u32 lkey;
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long timeout;
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int sq_depth;
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struct semaphore sq_sem;
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int rq_depth;
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atomic_t rq_count;
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struct sockaddr_in addr;
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spinlock_t req_lock;
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struct completion cm_done;
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};
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/**
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* p9_rdma_context - Keeps track of in-process WR
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*
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* @wc_op: The original WR op for when the CQE completes in error.
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* @busa: Bus address to unmap when the WR completes
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* @req: Keeps track of requests (send)
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* @rc: Keepts track of replies (receive)
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*/
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struct p9_rdma_req;
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struct p9_rdma_context {
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enum ib_wc_opcode wc_op;
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dma_addr_t busa;
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union {
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struct p9_req_t *req;
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struct p9_fcall *rc;
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};
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};
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/**
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* p9_rdma_opts - Collection of mount options
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* @port: port of connection
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* @sq_depth: The requested depth of the SQ. This really doesn't need
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* to be any deeper than the number of threads used in the client
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* @rq_depth: The depth of the RQ. Should be greater than or equal to SQ depth
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* @timeout: Time to wait in msecs for CM events
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*/
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struct p9_rdma_opts {
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short port;
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int sq_depth;
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int rq_depth;
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long timeout;
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};
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/*
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* Option Parsing (code inspired by NFS code)
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*/
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enum {
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/* Options that take integer arguments */
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Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout, Opt_err,
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};
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static match_table_t tokens = {
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{Opt_port, "port=%u"},
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{Opt_sq_depth, "sq=%u"},
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{Opt_rq_depth, "rq=%u"},
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{Opt_timeout, "timeout=%u"},
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{Opt_err, NULL},
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};
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/**
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* parse_options - parse mount options into session structure
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* @options: options string passed from mount
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* @opts: transport-specific structure to parse options into
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*
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* Returns 0 upon success, -ERRNO upon failure
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*/
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static int parse_opts(char *params, struct p9_rdma_opts *opts)
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{
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char *p;
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substring_t args[MAX_OPT_ARGS];
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int option;
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char *options;
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int ret;
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opts->port = P9_PORT;
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opts->sq_depth = P9_RDMA_SQ_DEPTH;
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opts->rq_depth = P9_RDMA_RQ_DEPTH;
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opts->timeout = P9_RDMA_TIMEOUT;
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if (!params)
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return 0;
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options = kstrdup(params, GFP_KERNEL);
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if (!options) {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"failed to allocate copy of option string\n");
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return -ENOMEM;
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}
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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int r;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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r = match_int(&args[0], &option);
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if (r < 0) {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"integer field, but no integer?\n");
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ret = r;
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continue;
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}
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switch (token) {
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case Opt_port:
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opts->port = option;
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break;
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case Opt_sq_depth:
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opts->sq_depth = option;
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break;
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case Opt_rq_depth:
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opts->rq_depth = option;
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break;
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case Opt_timeout:
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opts->timeout = option;
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break;
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default:
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continue;
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}
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}
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/* RQ must be at least as large as the SQ */
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opts->rq_depth = max(opts->rq_depth, opts->sq_depth);
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kfree(options);
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return 0;
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}
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static int
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p9_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event)
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{
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struct p9_client *c = id->context;
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struct p9_trans_rdma *rdma = c->trans;
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switch (event->event) {
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case RDMA_CM_EVENT_ADDR_RESOLVED:
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BUG_ON(rdma->state != P9_RDMA_INIT);
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rdma->state = P9_RDMA_ADDR_RESOLVED;
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break;
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case RDMA_CM_EVENT_ROUTE_RESOLVED:
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BUG_ON(rdma->state != P9_RDMA_ADDR_RESOLVED);
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rdma->state = P9_RDMA_ROUTE_RESOLVED;
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break;
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case RDMA_CM_EVENT_ESTABLISHED:
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BUG_ON(rdma->state != P9_RDMA_ROUTE_RESOLVED);
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rdma->state = P9_RDMA_CONNECTED;
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break;
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case RDMA_CM_EVENT_DISCONNECTED:
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if (rdma)
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rdma->state = P9_RDMA_CLOSED;
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if (c)
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c->status = Disconnected;
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break;
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case RDMA_CM_EVENT_TIMEWAIT_EXIT:
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break;
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case RDMA_CM_EVENT_ADDR_CHANGE:
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case RDMA_CM_EVENT_ROUTE_ERROR:
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case RDMA_CM_EVENT_DEVICE_REMOVAL:
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case RDMA_CM_EVENT_MULTICAST_JOIN:
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case RDMA_CM_EVENT_MULTICAST_ERROR:
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case RDMA_CM_EVENT_REJECTED:
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case RDMA_CM_EVENT_CONNECT_REQUEST:
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case RDMA_CM_EVENT_CONNECT_RESPONSE:
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case RDMA_CM_EVENT_CONNECT_ERROR:
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case RDMA_CM_EVENT_ADDR_ERROR:
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case RDMA_CM_EVENT_UNREACHABLE:
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c->status = Disconnected;
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rdma_disconnect(rdma->cm_id);
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break;
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default:
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BUG();
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}
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complete(&rdma->cm_done);
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return 0;
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}
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static void
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handle_recv(struct p9_client *client, struct p9_trans_rdma *rdma,
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struct p9_rdma_context *c, enum ib_wc_status status, u32 byte_len)
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{
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struct p9_req_t *req;
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int err = 0;
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int16_t tag;
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req = NULL;
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ib_dma_unmap_single(rdma->cm_id->device, c->busa, client->msize,
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DMA_FROM_DEVICE);
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if (status != IB_WC_SUCCESS)
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goto err_out;
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err = p9_parse_header(c->rc, NULL, NULL, &tag, 1);
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if (err)
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goto err_out;
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req = p9_tag_lookup(client, tag);
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if (!req)
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goto err_out;
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req->rc = c->rc;
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p9_client_cb(client, req);
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return;
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err_out:
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P9_DPRINTK(P9_DEBUG_ERROR, "req %p err %d status %d\n",
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req, err, status);
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rdma->state = P9_RDMA_FLUSHING;
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client->status = Disconnected;
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return;
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}
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static void
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handle_send(struct p9_client *client, struct p9_trans_rdma *rdma,
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struct p9_rdma_context *c, enum ib_wc_status status, u32 byte_len)
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{
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ib_dma_unmap_single(rdma->cm_id->device,
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c->busa, c->req->tc->size,
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|
DMA_TO_DEVICE);
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}
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|
|
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static void qp_event_handler(struct ib_event *event, void *context)
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{
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P9_DPRINTK(P9_DEBUG_ERROR, "QP event %d context %p\n", event->event,
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context);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void cq_comp_handler(struct ib_cq *cq, void *cq_context)
|
||||||
|
{
|
||||||
|
struct p9_client *client = cq_context;
|
||||||
|
struct p9_trans_rdma *rdma = client->trans;
|
||||||
|
int ret;
|
||||||
|
struct ib_wc wc;
|
||||||
|
|
||||||
|
ib_req_notify_cq(rdma->cq, IB_CQ_NEXT_COMP);
|
||||||
|
while ((ret = ib_poll_cq(cq, 1, &wc)) > 0) {
|
||||||
|
struct p9_rdma_context *c = (void *) (unsigned long) wc.wr_id;
|
||||||
|
|
||||||
|
switch (c->wc_op) {
|
||||||
|
case IB_WC_RECV:
|
||||||
|
atomic_dec(&rdma->rq_count);
|
||||||
|
handle_recv(client, rdma, c, wc.status, wc.byte_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case IB_WC_SEND:
|
||||||
|
handle_send(client, rdma, c, wc.status, wc.byte_len);
|
||||||
|
up(&rdma->sq_sem);
|
||||||
|
break;
|
||||||
|
|
||||||
|
default:
|
||||||
|
printk(KERN_ERR "9prdma: unexpected completion type, "
|
||||||
|
"c->wc_op=%d, wc.opcode=%d, status=%d\n",
|
||||||
|
c->wc_op, wc.opcode, wc.status);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
kfree(c);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static void cq_event_handler(struct ib_event *e, void *v)
|
||||||
|
{
|
||||||
|
P9_DPRINTK(P9_DEBUG_ERROR, "CQ event %d context %p\n", e->event, v);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void rdma_destroy_trans(struct p9_trans_rdma *rdma)
|
||||||
|
{
|
||||||
|
if (!rdma)
|
||||||
|
return;
|
||||||
|
|
||||||
|
if (rdma->dma_mr && !IS_ERR(rdma->dma_mr))
|
||||||
|
ib_dereg_mr(rdma->dma_mr);
|
||||||
|
|
||||||
|
if (rdma->qp && !IS_ERR(rdma->qp))
|
||||||
|
ib_destroy_qp(rdma->qp);
|
||||||
|
|
||||||
|
if (rdma->pd && !IS_ERR(rdma->pd))
|
||||||
|
ib_dealloc_pd(rdma->pd);
|
||||||
|
|
||||||
|
if (rdma->cq && !IS_ERR(rdma->cq))
|
||||||
|
ib_destroy_cq(rdma->cq);
|
||||||
|
|
||||||
|
if (rdma->cm_id && !IS_ERR(rdma->cm_id))
|
||||||
|
rdma_destroy_id(rdma->cm_id);
|
||||||
|
|
||||||
|
kfree(rdma);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int
|
||||||
|
post_recv(struct p9_client *client, struct p9_rdma_context *c)
|
||||||
|
{
|
||||||
|
struct p9_trans_rdma *rdma = client->trans;
|
||||||
|
struct ib_recv_wr wr, *bad_wr;
|
||||||
|
struct ib_sge sge;
|
||||||
|
|
||||||
|
c->busa = ib_dma_map_single(rdma->cm_id->device,
|
||||||
|
c->rc->sdata, client->msize,
|
||||||
|
DMA_FROM_DEVICE);
|
||||||
|
if (ib_dma_mapping_error(rdma->cm_id->device, c->busa))
|
||||||
|
goto error;
|
||||||
|
|
||||||
|
sge.addr = c->busa;
|
||||||
|
sge.length = client->msize;
|
||||||
|
sge.lkey = rdma->lkey;
|
||||||
|
|
||||||
|
wr.next = NULL;
|
||||||
|
c->wc_op = IB_WC_RECV;
|
||||||
|
wr.wr_id = (unsigned long) c;
|
||||||
|
wr.sg_list = &sge;
|
||||||
|
wr.num_sge = 1;
|
||||||
|
return ib_post_recv(rdma->qp, &wr, &bad_wr);
|
||||||
|
|
||||||
|
error:
|
||||||
|
P9_DPRINTK(P9_DEBUG_ERROR, "EIO\n");
|
||||||
|
return -EIO;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int rdma_request(struct p9_client *client, struct p9_req_t *req)
|
||||||
|
{
|
||||||
|
struct p9_trans_rdma *rdma = client->trans;
|
||||||
|
struct ib_send_wr wr, *bad_wr;
|
||||||
|
struct ib_sge sge;
|
||||||
|
int err = 0;
|
||||||
|
unsigned long flags;
|
||||||
|
struct p9_rdma_context *c = NULL;
|
||||||
|
struct p9_rdma_context *rpl_context = NULL;
|
||||||
|
|
||||||
|
/* Allocate an fcall for the reply */
|
||||||
|
rpl_context = kmalloc(sizeof *rpl_context, GFP_KERNEL);
|
||||||
|
if (!rpl_context)
|
||||||
|
goto err_close;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* If the request has a buffer, steal it, otherwise
|
||||||
|
* allocate a new one. Typically, requests should already
|
||||||
|
* have receive buffers allocated and just swap them around
|
||||||
|
*/
|
||||||
|
if (!req->rc) {
|
||||||
|
req->rc = kmalloc(sizeof(struct p9_fcall)+client->msize,
|
||||||
|
GFP_KERNEL);
|
||||||
|
if (req->rc) {
|
||||||
|
req->rc->sdata = (char *) req->rc +
|
||||||
|
sizeof(struct p9_fcall);
|
||||||
|
req->rc->capacity = client->msize;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
rpl_context->rc = req->rc;
|
||||||
|
if (!rpl_context->rc) {
|
||||||
|
kfree(rpl_context);
|
||||||
|
goto err_close;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Post a receive buffer for this request. We need to ensure
|
||||||
|
* there is a reply buffer available for every outstanding
|
||||||
|
* request. A flushed request can result in no reply for an
|
||||||
|
* outstanding request, so we must keep a count to avoid
|
||||||
|
* overflowing the RQ.
|
||||||
|
*/
|
||||||
|
if (atomic_inc_return(&rdma->rq_count) <= rdma->rq_depth) {
|
||||||
|
err = post_recv(client, rpl_context);
|
||||||
|
if (err) {
|
||||||
|
kfree(rpl_context->rc);
|
||||||
|
kfree(rpl_context);
|
||||||
|
goto err_close;
|
||||||
|
}
|
||||||
|
} else
|
||||||
|
atomic_dec(&rdma->rq_count);
|
||||||
|
|
||||||
|
/* remove posted receive buffer from request structure */
|
||||||
|
req->rc = NULL;
|
||||||
|
|
||||||
|
/* Post the request */
|
||||||
|
c = kmalloc(sizeof *c, GFP_KERNEL);
|
||||||
|
if (!c)
|
||||||
|
goto err_close;
|
||||||
|
c->req = req;
|
||||||
|
|
||||||
|
c->busa = ib_dma_map_single(rdma->cm_id->device,
|
||||||
|
c->req->tc->sdata, c->req->tc->size,
|
||||||
|
DMA_TO_DEVICE);
|
||||||
|
if (ib_dma_mapping_error(rdma->cm_id->device, c->busa))
|
||||||
|
goto error;
|
||||||
|
|
||||||
|
sge.addr = c->busa;
|
||||||
|
sge.length = c->req->tc->size;
|
||||||
|
sge.lkey = rdma->lkey;
|
||||||
|
|
||||||
|
wr.next = NULL;
|
||||||
|
c->wc_op = IB_WC_SEND;
|
||||||
|
wr.wr_id = (unsigned long) c;
|
||||||
|
wr.opcode = IB_WR_SEND;
|
||||||
|
wr.send_flags = IB_SEND_SIGNALED;
|
||||||
|
wr.sg_list = &sge;
|
||||||
|
wr.num_sge = 1;
|
||||||
|
|
||||||
|
if (down_interruptible(&rdma->sq_sem))
|
||||||
|
goto error;
|
||||||
|
|
||||||
|
return ib_post_send(rdma->qp, &wr, &bad_wr);
|
||||||
|
|
||||||
|
error:
|
||||||
|
P9_DPRINTK(P9_DEBUG_ERROR, "EIO\n");
|
||||||
|
return -EIO;
|
||||||
|
|
||||||
|
err_close:
|
||||||
|
spin_lock_irqsave(&rdma->req_lock, flags);
|
||||||
|
if (rdma->state < P9_RDMA_CLOSING) {
|
||||||
|
rdma->state = P9_RDMA_CLOSING;
|
||||||
|
spin_unlock_irqrestore(&rdma->req_lock, flags);
|
||||||
|
rdma_disconnect(rdma->cm_id);
|
||||||
|
} else
|
||||||
|
spin_unlock_irqrestore(&rdma->req_lock, flags);
|
||||||
|
return err;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void rdma_close(struct p9_client *client)
|
||||||
|
{
|
||||||
|
struct p9_trans_rdma *rdma;
|
||||||
|
|
||||||
|
if (!client)
|
||||||
|
return;
|
||||||
|
|
||||||
|
rdma = client->trans;
|
||||||
|
if (!rdma)
|
||||||
|
return;
|
||||||
|
|
||||||
|
client->status = Disconnected;
|
||||||
|
rdma_disconnect(rdma->cm_id);
|
||||||
|
rdma_destroy_trans(rdma);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* alloc_rdma - Allocate and initialize the rdma transport structure
|
||||||
|
* @msize: MTU
|
||||||
|
* @dotu: Extension attribute
|
||||||
|
* @opts: Mount options structure
|
||||||
|
*/
|
||||||
|
static struct p9_trans_rdma *alloc_rdma(struct p9_rdma_opts *opts)
|
||||||
|
{
|
||||||
|
struct p9_trans_rdma *rdma;
|
||||||
|
|
||||||
|
rdma = kzalloc(sizeof(struct p9_trans_rdma), GFP_KERNEL);
|
||||||
|
if (!rdma)
|
||||||
|
return NULL;
|
||||||
|
|
||||||
|
rdma->sq_depth = opts->sq_depth;
|
||||||
|
rdma->rq_depth = opts->rq_depth;
|
||||||
|
rdma->timeout = opts->timeout;
|
||||||
|
spin_lock_init(&rdma->req_lock);
|
||||||
|
init_completion(&rdma->cm_done);
|
||||||
|
sema_init(&rdma->sq_sem, rdma->sq_depth);
|
||||||
|
atomic_set(&rdma->rq_count, 0);
|
||||||
|
|
||||||
|
return rdma;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* its not clear to me we can do anything after send has been posted */
|
||||||
|
static int rdma_cancel(struct p9_client *client, struct p9_req_t *req)
|
||||||
|
{
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* trans_create_rdma - Transport method for creating atransport instance
|
||||||
|
* @client: client instance
|
||||||
|
* @addr: IP address string
|
||||||
|
* @args: Mount options string
|
||||||
|
*/
|
||||||
|
static int
|
||||||
|
rdma_create_trans(struct p9_client *client, const char *addr, char *args)
|
||||||
|
{
|
||||||
|
int err;
|
||||||
|
struct p9_rdma_opts opts;
|
||||||
|
struct p9_trans_rdma *rdma;
|
||||||
|
struct rdma_conn_param conn_param;
|
||||||
|
struct ib_qp_init_attr qp_attr;
|
||||||
|
struct ib_device_attr devattr;
|
||||||
|
|
||||||
|
/* Parse the transport specific mount options */
|
||||||
|
err = parse_opts(args, &opts);
|
||||||
|
if (err < 0)
|
||||||
|
return err;
|
||||||
|
|
||||||
|
/* Create and initialize the RDMA transport structure */
|
||||||
|
rdma = alloc_rdma(&opts);
|
||||||
|
if (!rdma)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
/* Create the RDMA CM ID */
|
||||||
|
rdma->cm_id = rdma_create_id(p9_cm_event_handler, client, RDMA_PS_TCP);
|
||||||
|
if (IS_ERR(rdma->cm_id))
|
||||||
|
goto error;
|
||||||
|
|
||||||
|
/* Resolve the server's address */
|
||||||
|
rdma->addr.sin_family = AF_INET;
|
||||||
|
rdma->addr.sin_addr.s_addr = in_aton(addr);
|
||||||
|
rdma->addr.sin_port = htons(opts.port);
|
||||||
|
err = rdma_resolve_addr(rdma->cm_id, NULL,
|
||||||
|
(struct sockaddr *)&rdma->addr,
|
||||||
|
rdma->timeout);
|
||||||
|
if (err)
|
||||||
|
goto error;
|
||||||
|
err = wait_for_completion_interruptible(&rdma->cm_done);
|
||||||
|
if (err || (rdma->state != P9_RDMA_ADDR_RESOLVED))
|
||||||
|
goto error;
|
||||||
|
|
||||||
|
/* Resolve the route to the server */
|
||||||
|
err = rdma_resolve_route(rdma->cm_id, rdma->timeout);
|
||||||
|
if (err)
|
||||||
|
goto error;
|
||||||
|
err = wait_for_completion_interruptible(&rdma->cm_done);
|
||||||
|
if (err || (rdma->state != P9_RDMA_ROUTE_RESOLVED))
|
||||||
|
goto error;
|
||||||
|
|
||||||
|
/* Query the device attributes */
|
||||||
|
err = ib_query_device(rdma->cm_id->device, &devattr);
|
||||||
|
if (err)
|
||||||
|
goto error;
|
||||||
|
|
||||||
|
/* Create the Completion Queue */
|
||||||
|
rdma->cq = ib_create_cq(rdma->cm_id->device, cq_comp_handler,
|
||||||
|
cq_event_handler, client,
|
||||||
|
opts.sq_depth + opts.rq_depth + 1, 0);
|
||||||
|
if (IS_ERR(rdma->cq))
|
||||||
|
goto error;
|
||||||
|
ib_req_notify_cq(rdma->cq, IB_CQ_NEXT_COMP);
|
||||||
|
|
||||||
|
/* Create the Protection Domain */
|
||||||
|
rdma->pd = ib_alloc_pd(rdma->cm_id->device);
|
||||||
|
if (IS_ERR(rdma->pd))
|
||||||
|
goto error;
|
||||||
|
|
||||||
|
/* Cache the DMA lkey in the transport */
|
||||||
|
rdma->dma_mr = NULL;
|
||||||
|
if (devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)
|
||||||
|
rdma->lkey = rdma->cm_id->device->local_dma_lkey;
|
||||||
|
else {
|
||||||
|
rdma->dma_mr = ib_get_dma_mr(rdma->pd, IB_ACCESS_LOCAL_WRITE);
|
||||||
|
if (IS_ERR(rdma->dma_mr))
|
||||||
|
goto error;
|
||||||
|
rdma->lkey = rdma->dma_mr->lkey;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Create the Queue Pair */
|
||||||
|
memset(&qp_attr, 0, sizeof qp_attr);
|
||||||
|
qp_attr.event_handler = qp_event_handler;
|
||||||
|
qp_attr.qp_context = client;
|
||||||
|
qp_attr.cap.max_send_wr = opts.sq_depth;
|
||||||
|
qp_attr.cap.max_recv_wr = opts.rq_depth;
|
||||||
|
qp_attr.cap.max_send_sge = P9_RDMA_SEND_SGE;
|
||||||
|
qp_attr.cap.max_recv_sge = P9_RDMA_RECV_SGE;
|
||||||
|
qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
|
||||||
|
qp_attr.qp_type = IB_QPT_RC;
|
||||||
|
qp_attr.send_cq = rdma->cq;
|
||||||
|
qp_attr.recv_cq = rdma->cq;
|
||||||
|
err = rdma_create_qp(rdma->cm_id, rdma->pd, &qp_attr);
|
||||||
|
if (err)
|
||||||
|
goto error;
|
||||||
|
rdma->qp = rdma->cm_id->qp;
|
||||||
|
|
||||||
|
/* Request a connection */
|
||||||
|
memset(&conn_param, 0, sizeof(conn_param));
|
||||||
|
conn_param.private_data = NULL;
|
||||||
|
conn_param.private_data_len = 0;
|
||||||
|
conn_param.responder_resources = P9_RDMA_IRD;
|
||||||
|
conn_param.initiator_depth = P9_RDMA_ORD;
|
||||||
|
err = rdma_connect(rdma->cm_id, &conn_param);
|
||||||
|
if (err)
|
||||||
|
goto error;
|
||||||
|
err = wait_for_completion_interruptible(&rdma->cm_done);
|
||||||
|
if (err || (rdma->state != P9_RDMA_CONNECTED))
|
||||||
|
goto error;
|
||||||
|
|
||||||
|
client->trans = rdma;
|
||||||
|
client->status = Connected;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
error:
|
||||||
|
rdma_destroy_trans(rdma);
|
||||||
|
return -ENOTCONN;
|
||||||
|
}
|
||||||
|
|
||||||
|
static struct p9_trans_module p9_rdma_trans = {
|
||||||
|
.name = "rdma",
|
||||||
|
.maxsize = P9_RDMA_MAXSIZE,
|
||||||
|
.def = 0,
|
||||||
|
.owner = THIS_MODULE,
|
||||||
|
.create = rdma_create_trans,
|
||||||
|
.close = rdma_close,
|
||||||
|
.request = rdma_request,
|
||||||
|
.cancel = rdma_cancel,
|
||||||
|
};
|
||||||
|
|
||||||
|
/**
|
||||||
|
* p9_trans_rdma_init - Register the 9P RDMA transport driver
|
||||||
|
*/
|
||||||
|
static int __init p9_trans_rdma_init(void)
|
||||||
|
{
|
||||||
|
v9fs_register_trans(&p9_rdma_trans);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void __exit p9_trans_rdma_exit(void)
|
||||||
|
{
|
||||||
|
v9fs_unregister_trans(&p9_rdma_trans);
|
||||||
|
}
|
||||||
|
|
||||||
|
module_init(p9_trans_rdma_init);
|
||||||
|
module_exit(p9_trans_rdma_exit);
|
||||||
|
|
||||||
|
MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
|
||||||
|
MODULE_DESCRIPTION("RDMA Transport for 9P");
|
||||||
|
MODULE_LICENSE("Dual BSD/GPL");
|
||||||
Loading…
Reference in a new issue