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f5821c76b2
linux_dsm_epyc7002/include/linux/sunrpc/svc_rdma.h
Chuck Lever f5821c76b2 svcrdma: Clean up RPC-over-RDMA backchannel reply processing 
Replace C structure-based XDR decoding with pointer arithmetic.
Pointer arithmetic is considered more portable.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:55 -04:00

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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_bc_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;
/*
* 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 list_head list;
struct svc_rdma_op_ctxt *read_hdr;
struct svc_rdma_fastreg_mr *frmr;
int hdr_count;
struct xdr_buf arg;
struct ib_cqe cqe;
struct ib_cqe reg_cqe;
struct ib_cqe inv_cqe;
u32 byte_len;
u32 position;
struct svcxprt_rdma *xprt;
unsigned long flags;
enum dma_data_direction direction;
int count;
unsigned int mapped_sges;
struct ib_send_wr send_wr;
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;
struct scatterlist *sg;
int sg_nents;
unsigned long access_flags;
enum dma_data_direction direction;
struct list_head frmr_list;
};
struct svc_rdma_req_map {
struct list_head free;
unsigned long count;
union {
struct kvec sge[RPCSVC_MAXPAGES];
struct svc_rdma_chunk_sge ch[RPCSVC_MAXPAGES];
unsigned long lkey[RPCSVC_MAXPAGES];
};
};
#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_max_sge_rd; /* max sge for read target */
bool sc_snd_w_inv; /* OK to use Send With Invalidate */
atomic_t sc_sq_avail; /* SQEs ready to be consumed */
unsigned int sc_sq_depth; /* Depth of SQ */
unsigned int sc_rq_depth; /* Depth of RQ */
__be32 sc_fc_credits; /* Forward credits */
u32 sc_max_requests; /* Max requests */
u32 sc_max_bc_requests;/* Backward credits */
int sc_max_req_size; /* Size of each RQ WR buf */
u8 sc_port_num;
struct ib_pd *sc_pd;
spinlock_t sc_ctxt_lock;
struct list_head sc_ctxts;
int sc_ctxt_used;
spinlock_t sc_rw_ctxt_lock;
struct list_head sc_rw_ctxts;
spinlock_t sc_map_lock;
struct list_head sc_maps;
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;
int (*sc_reader)(struct svcxprt_rdma *,
struct svc_rqst *,
struct svc_rdma_op_ctxt *,
int *, u32 *, u32, u32, u64, bool);
u32 sc_dev_caps; /* distilled device caps */
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_read_complete_q;
struct work_struct sc_work;
};
/* sc_flags */
#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_MAX_REQUESTS 32
#define RPCRDMA_MAX_REQ_SIZE 4096
/* Typical ULP usage of BC requests is NFSv4.1 backchannel. Our
* current NFSv4.1 implementation supports one backchannel slot.
*/
#define RPCRDMA_MAX_BC_REQUESTS 2
#define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD
/* Track DMA maps for this transport and context */
static inline void svc_rdma_count_mappings(struct svcxprt_rdma *rdma,
struct svc_rdma_op_ctxt *ctxt)
{
ctxt->mapped_sges++;
}
/* svc_rdma_backchannel.c */
extern int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt,
__be32 *rdma_resp,
struct xdr_buf *rcvbuf);
/* svc_rdma_marshal.c */
extern int svc_rdma_xdr_decode_req(struct xdr_buf *);
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,
__be32, __be64, u32);
extern unsigned int svc_rdma_xdr_get_reply_hdr_len(__be32 *rdma_resp);
/* svc_rdma_recvfrom.c */
extern int svc_rdma_recvfrom(struct svc_rqst *);
extern int rdma_read_chunk_lcl(struct svcxprt_rdma *, struct svc_rqst *,
struct svc_rdma_op_ctxt *, int *, u32 *,
u32, u32, u64, bool);
extern int rdma_read_chunk_frmr(struct svcxprt_rdma *, struct svc_rqst *,
struct svc_rdma_op_ctxt *, int *, u32 *,
u32, u32, u64, bool);
/* svc_rdma_rw.c */
extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma);
extern int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma,
__be32 *wr_ch, struct xdr_buf *xdr);
extern int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma,
__be32 *rp_ch, bool writelist,
struct xdr_buf *xdr);
/* svc_rdma_sendto.c */
extern int svc_rdma_map_xdr(struct svcxprt_rdma *, struct xdr_buf *,
struct svc_rdma_req_map *, bool);
extern int svc_rdma_map_reply_hdr(struct svcxprt_rdma *rdma,
struct svc_rdma_op_ctxt *ctxt,
__be32 *rdma_resp, unsigned int len);
extern int svc_rdma_post_send_wr(struct svcxprt_rdma *rdma,
struct svc_rdma_op_ctxt *ctxt,
int num_sge, u32 inv_rkey);
extern int svc_rdma_sendto(struct svc_rqst *);
/* svc_rdma_transport.c */
extern void svc_rdma_wc_send(struct ib_cq *, struct ib_wc *);
extern void svc_rdma_wc_write(struct ib_cq *, struct ib_wc *);
extern void svc_rdma_wc_reg(struct ib_cq *, struct ib_wc *);
extern void svc_rdma_wc_read(struct ib_cq *, struct ib_wc *);
extern void svc_rdma_wc_inv(struct ib_cq *, struct ib_wc *);
extern int svc_rdma_send(struct svcxprt_rdma *, struct ib_send_wr *);
extern int svc_rdma_post_recv(struct svcxprt_rdma *, gfp_t);
extern int svc_rdma_repost_recv(struct svcxprt_rdma *, gfp_t);
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(struct svcxprt_rdma *);
extern void svc_rdma_put_req_map(struct svcxprt_rdma *,
struct svc_rdma_req_map *);
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 void svc_rdma_prep_reply_hdr(struct svc_rqst *);
extern struct svc_xprt_class svc_rdma_class;
#ifdef CONFIG_SUNRPC_BACKCHANNEL
extern struct svc_xprt_class svc_rdma_bc_class;
#endif
/* svc_rdma.c */
extern struct workqueue_struct *svc_rdma_wq;
extern int svc_rdma_init(void);
extern void svc_rdma_cleanup(void);
#endif
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