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linux-loongson/include/linux/sunrpc/svc_rdma.h
Tom Tucker 146b6df6a5 svcrdma: Modify the RPC recv path to use FRMR when available 
RPCRDMA requests that specify a read-list are fetched with RDMA_READ. Using
an FRMR to map the data sink improves NFSRDMA security on transports that
place the RDMA_READ data sink LKEY on the wire because the valid lifetime
of the MR is only the duration of the RDMA_READ. The LKEY is invalidated
when the last RDMA_READ WR completes.

Mapping the data sink also allows for very large amounts to data to be
fetched with a single WR, so if the client is also using FRMR, the entire
RPC read-list can be fetched with a single WR.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-10-06 14:46:01 -05:00

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/*
* 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@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 and stats */
extern unsigned int svcrdma_ord;
extern unsigned int svcrdma_max_requests;
extern unsigned int svcrdma_max_req_size;
extern atomic_t rdma_stat_recv;
extern atomic_t rdma_stat_read;
extern atomic_t rdma_stat_write;
extern atomic_t rdma_stat_sq_starve;
extern atomic_t rdma_stat_rq_starve;
extern atomic_t rdma_stat_rq_poll;
extern atomic_t rdma_stat_rq_prod;
extern atomic_t rdma_stat_sq_poll;
extern atomic_t 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 *read_hdr;
struct svc_rdma_fastreg_mr *frmr;
int hdr_count;
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];
};
/*
* NFS_ requests are mapped on the client side by the chunk lists in
* the RPCRDMA header. During the fetching of the RPC from the client
* and the writing of the reply to the client, the memory in the
* client and the memory in the server must be mapped as contiguous
* vaddr/len for access by the hardware. These data strucures keep
* these mappings.
*
* For an RDMA_WRITE, the 'sge' maps the RPC REPLY. For RDMA_READ, the
* 'sge' in the svc_rdma_req_map maps the server side RPC reply and the
* 'ch' field maps the read-list of the RPCRDMA header to the 'sge'
* mapping of the reply.
*/
struct svc_rdma_chunk_sge {
int start; /* sge no for this chunk */
int count; /* sge count for this chunk */
};
struct svc_rdma_fastreg_mr {
struct ib_mr *mr;
void *kva;
struct ib_fast_reg_page_list *page_list;
int page_list_len;
unsigned long access_flags;
unsigned long map_len;
enum dma_data_direction direction;
struct list_head frmr_list;
};
struct svc_rdma_req_map {
struct svc_rdma_fastreg_mr *frmr;
unsigned long count;
union {
struct kvec sge[RPCSVC_MAXPAGES];
struct svc_rdma_chunk_sge ch[RPCSVC_MAXPAGES];
};
};
#define RDMACTXT_F_FAST_UNREG 1
#define RDMACTXT_F_LAST_CTXT 2
#define SVCRDMA_DEVCAP_FAST_REG 1 /* fast mr registration */
#define SVCRDMA_DEVCAP_READ_W_INV 2 /* read w/ invalidate */
struct svcxprt_rdma {
struct svc_xprt 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 */
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;
atomic_t sc_dma_used;
atomic_t sc_ctxt_used;
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 */
u32 sc_dev_caps; /* distilled device caps */
u32 sc_dma_lkey; /* local dma key */
unsigned int sc_frmr_pg_list_len;
struct list_head sc_frmr_q;
spinlock_t sc_frmr_q_lock;
spinlock_t sc_lock; /* transport lock */
wait_queue_head_t sc_send_wait; /* SQ exhaustion waitlist */
unsigned long sc_flags;
struct list_head sc_dto_q; /* DTO tasklet I/O pending Q */
struct list_head sc_read_complete_q;
struct work_struct sc_work;
};
/* sc_flags */
#define RDMAXPRT_RQ_PENDING 1
#define RDMAXPRT_SQ_PENDING 2
#define RDMAXPRT_CONN_PENDING 3
#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 void 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_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt);
extern struct svc_rdma_req_map *svc_rdma_get_req_map(void);
extern void svc_rdma_put_req_map(struct svc_rdma_req_map *);
extern int svc_rdma_fastreg(struct svcxprt_rdma *, struct svc_rdma_fastreg_mr *);
extern struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *);
extern void svc_rdma_put_frmr(struct svcxprt_rdma *,
struct svc_rdma_fastreg_mr *);
extern void svc_sq_reap(struct svcxprt_rdma *);
extern void svc_rq_reap(struct svcxprt_rdma *);
extern struct svc_xprt_class svc_rdma_class;
extern void svc_rdma_prep_reply_hdr(struct svc_rqst *);
/* 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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