| /* |
| * 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 |
| |
| /* Default and maximum inline threshold sizes */ |
| enum { |
| RPCRDMA_DEF_INLINE_THRESH = 4096, |
| RPCRDMA_MAX_INLINE_THRESH = 65536 |
| }; |
| |
| /* 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 xdr_buf arg; |
| struct ib_cqe cqe; |
| u32 byte_len; |
| struct svcxprt_rdma *xprt; |
| enum dma_data_direction direction; |
| int count; |
| unsigned int mapped_sges; |
| int hdr_count; |
| struct ib_send_wr send_wr; |
| struct ib_sge sge[1 + RPCRDMA_MAX_INLINE_THRESH / PAGE_SIZE]; |
| struct page *pages[RPCSVC_MAXPAGES]; |
| }; |
| |
| 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; |
| 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; |
| |
| 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; |
| |
| 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 |
| |
| /* 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_recvfrom.c */ |
| extern int svc_rdma_recvfrom(struct svc_rqst *); |
| |
| /* svc_rdma_rw.c */ |
| extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma); |
| extern int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma, |
| struct svc_rqst *rqstp, |
| struct svc_rdma_op_ctxt *head, __be32 *p); |
| 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_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_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 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 |
