| /* | |
| * 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_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 |