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4866073e6d
Use a wait-free mechanism for managing the svc_rdma_recv_ctxts free list. Subsequently, sc_recv_lock can be eliminated. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
208 lines
7.0 KiB
C
208 lines
7.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
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/*
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* Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the BSD-type
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Network Appliance, Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Author: Tom Tucker <tom@opengridcomputing.com>
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*/
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#ifndef SVC_RDMA_H
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#define SVC_RDMA_H
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#include <linux/llist.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/sunrpc/rpc_rdma.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#define SVCRDMA_DEBUG
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/* Default and maximum inline threshold sizes */
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enum {
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RPCRDMA_DEF_INLINE_THRESH = 4096,
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RPCRDMA_MAX_INLINE_THRESH = 65536
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};
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/* RPC/RDMA parameters and stats */
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extern unsigned int svcrdma_ord;
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extern unsigned int svcrdma_max_requests;
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extern unsigned int svcrdma_max_bc_requests;
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extern unsigned int svcrdma_max_req_size;
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extern atomic_t rdma_stat_recv;
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extern atomic_t rdma_stat_read;
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extern atomic_t rdma_stat_write;
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extern atomic_t rdma_stat_sq_starve;
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extern atomic_t rdma_stat_rq_starve;
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extern atomic_t rdma_stat_rq_poll;
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extern atomic_t rdma_stat_rq_prod;
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extern atomic_t rdma_stat_sq_poll;
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extern atomic_t rdma_stat_sq_prod;
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struct svcxprt_rdma {
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struct svc_xprt sc_xprt; /* SVC transport structure */
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struct rdma_cm_id *sc_cm_id; /* RDMA connection id */
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struct list_head sc_accept_q; /* Conn. waiting accept */
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int sc_ord; /* RDMA read limit */
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int sc_max_send_sges;
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bool sc_snd_w_inv; /* OK to use Send With Invalidate */
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atomic_t sc_sq_avail; /* SQEs ready to be consumed */
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unsigned int sc_sq_depth; /* Depth of SQ */
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__be32 sc_fc_credits; /* Forward credits */
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u32 sc_max_requests; /* Max requests */
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u32 sc_max_bc_requests;/* Backward credits */
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int sc_max_req_size; /* Size of each RQ WR buf */
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u8 sc_port_num;
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struct ib_pd *sc_pd;
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spinlock_t sc_send_lock;
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struct list_head sc_send_ctxts;
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spinlock_t sc_rw_ctxt_lock;
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struct list_head sc_rw_ctxts;
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struct list_head sc_rq_dto_q;
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spinlock_t sc_rq_dto_lock;
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struct ib_qp *sc_qp;
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struct ib_cq *sc_rq_cq;
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struct ib_cq *sc_sq_cq;
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spinlock_t sc_lock; /* transport lock */
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wait_queue_head_t sc_send_wait; /* SQ exhaustion waitlist */
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unsigned long sc_flags;
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struct list_head sc_read_complete_q;
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struct work_struct sc_work;
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struct llist_head sc_recv_ctxts;
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};
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/* sc_flags */
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#define RDMAXPRT_CONN_PENDING 3
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/*
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* Default connection parameters
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*/
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enum {
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RPCRDMA_LISTEN_BACKLOG = 10,
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RPCRDMA_MAX_REQUESTS = 64,
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RPCRDMA_MAX_BC_REQUESTS = 2,
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};
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#define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD
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struct svc_rdma_recv_ctxt {
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struct llist_node rc_node;
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struct list_head rc_list;
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struct ib_recv_wr rc_recv_wr;
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struct ib_cqe rc_cqe;
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struct ib_sge rc_recv_sge;
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void *rc_recv_buf;
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struct xdr_buf rc_arg;
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bool rc_temp;
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u32 rc_byte_len;
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unsigned int rc_page_count;
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unsigned int rc_hdr_count;
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u32 rc_inv_rkey;
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struct page *rc_pages[RPCSVC_MAXPAGES];
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};
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struct svc_rdma_send_ctxt {
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struct list_head sc_list;
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struct ib_send_wr sc_send_wr;
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struct ib_cqe sc_cqe;
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void *sc_xprt_buf;
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int sc_page_count;
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int sc_cur_sge_no;
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struct page *sc_pages[RPCSVC_MAXPAGES];
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struct ib_sge sc_sges[];
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};
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/* svc_rdma_backchannel.c */
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extern int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt,
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__be32 *rdma_resp,
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struct xdr_buf *rcvbuf);
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/* svc_rdma_recvfrom.c */
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extern void svc_rdma_recv_ctxts_destroy(struct svcxprt_rdma *rdma);
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extern bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma);
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extern void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
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struct svc_rdma_recv_ctxt *ctxt);
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extern void svc_rdma_flush_recv_queues(struct svcxprt_rdma *rdma);
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extern int svc_rdma_recvfrom(struct svc_rqst *);
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/* svc_rdma_rw.c */
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extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma);
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extern int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma,
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struct svc_rqst *rqstp,
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struct svc_rdma_recv_ctxt *head, __be32 *p);
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extern int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma,
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__be32 *wr_ch, struct xdr_buf *xdr);
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extern int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma,
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__be32 *rp_ch, bool writelist,
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struct xdr_buf *xdr);
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/* svc_rdma_sendto.c */
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extern void svc_rdma_send_ctxts_destroy(struct svcxprt_rdma *rdma);
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extern struct svc_rdma_send_ctxt *
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svc_rdma_send_ctxt_get(struct svcxprt_rdma *rdma);
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extern void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma,
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struct svc_rdma_send_ctxt *ctxt);
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extern int svc_rdma_send(struct svcxprt_rdma *rdma, struct ib_send_wr *wr);
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extern void svc_rdma_sync_reply_hdr(struct svcxprt_rdma *rdma,
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struct svc_rdma_send_ctxt *ctxt,
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unsigned int len);
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extern int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,
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struct svc_rdma_send_ctxt *ctxt,
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struct xdr_buf *xdr, __be32 *wr_lst);
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extern int svc_rdma_sendto(struct svc_rqst *);
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/* svc_rdma_transport.c */
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extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
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extern void svc_sq_reap(struct svcxprt_rdma *);
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extern void svc_rq_reap(struct svcxprt_rdma *);
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extern struct svc_xprt_class svc_rdma_class;
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#ifdef CONFIG_SUNRPC_BACKCHANNEL
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extern struct svc_xprt_class svc_rdma_bc_class;
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#endif
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/* svc_rdma.c */
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extern int svc_rdma_init(void);
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extern void svc_rdma_cleanup(void);
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#endif
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