/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ /* * 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 <[email protected]> */ #ifndef SVC_RDMA_H #define SVC_RDMA_H #include <linux/llist.h> #include <linux/sunrpc/xdr.h> #include <linux/sunrpc/svcsock.h> #include <linux/sunrpc/rpc_rdma.h> #include <linux/sunrpc/rpc_rdma_cid.h> #include <linux/sunrpc/svc_rdma_pcl.h> #include <linux/sunrpc/rdma_rn.h> #include <linux/percpu_counter.h> #include <rdma/ib_verbs.h> #include <rdma/rdma_cm.h> /* Default and maximum inline threshold sizes */ enum { … }; /* 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 struct workqueue_struct *svcrdma_wq; extern struct percpu_counter svcrdma_stat_read; extern struct percpu_counter svcrdma_stat_recv; extern struct percpu_counter svcrdma_stat_sq_starve; extern struct percpu_counter svcrdma_stat_write; struct svcxprt_rdma { … }; /* sc_flags */ #define RDMAXPRT_CONN_PENDING … static inline struct svcxprt_rdma *svc_rdma_rqst_rdma(struct svc_rqst *rqstp) { … } /* * Default connection parameters */ enum { … }; #define RPCSVC_MAXPAYLOAD_RDMA … /** * svc_rdma_send_cid_init - Initialize a Receive Queue completion ID * @rdma: controlling transport * @cid: completion ID to initialize */ static inline void svc_rdma_recv_cid_init(struct svcxprt_rdma *rdma, struct rpc_rdma_cid *cid) { … } /** * svc_rdma_send_cid_init - Initialize a Send Queue completion ID * @rdma: controlling transport * @cid: completion ID to initialize */ static inline void svc_rdma_send_cid_init(struct svcxprt_rdma *rdma, struct rpc_rdma_cid *cid) { … } /* * A chunk context tracks all I/O for moving one Read or Write * chunk. This is a set of rdma_rw's that handle data movement * for all segments of one chunk. */ struct svc_rdma_chunk_ctxt { … }; struct svc_rdma_recv_ctxt { … }; /* * State for sending a Write chunk. * - Tracks progress of writing one chunk over all its segments * - Stores arguments for the SGL constructor functions */ struct svc_rdma_write_info { … }; struct svc_rdma_send_ctxt { … }; /* svc_rdma_backchannel.c */ extern void svc_rdma_handle_bc_reply(struct svc_rqst *rqstp, struct svc_rdma_recv_ctxt *rctxt); /* svc_rdma_recvfrom.c */ extern void svc_rdma_recv_ctxts_destroy(struct svcxprt_rdma *rdma); extern bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma); extern struct svc_rdma_recv_ctxt * svc_rdma_recv_ctxt_get(struct svcxprt_rdma *rdma); extern void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma, struct svc_rdma_recv_ctxt *ctxt); extern void svc_rdma_flush_recv_queues(struct svcxprt_rdma *rdma); extern void svc_rdma_release_ctxt(struct svc_xprt *xprt, void *ctxt); extern int svc_rdma_recvfrom(struct svc_rqst *); /* svc_rdma_rw.c */ extern void svc_rdma_cc_init(struct svcxprt_rdma *rdma, struct svc_rdma_chunk_ctxt *cc); extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma); extern void svc_rdma_cc_init(struct svcxprt_rdma *rdma, struct svc_rdma_chunk_ctxt *cc); extern void svc_rdma_cc_release(struct svcxprt_rdma *rdma, struct svc_rdma_chunk_ctxt *cc, enum dma_data_direction dir); extern void svc_rdma_reply_chunk_release(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *ctxt); extern int svc_rdma_send_write_list(struct svcxprt_rdma *rdma, const struct svc_rdma_recv_ctxt *rctxt, const struct xdr_buf *xdr); extern int svc_rdma_prepare_reply_chunk(struct svcxprt_rdma *rdma, const struct svc_rdma_pcl *write_pcl, const struct svc_rdma_pcl *reply_pcl, struct svc_rdma_send_ctxt *sctxt, const struct xdr_buf *xdr); extern int svc_rdma_process_read_list(struct svcxprt_rdma *rdma, struct svc_rqst *rqstp, struct svc_rdma_recv_ctxt *head); /* svc_rdma_sendto.c */ extern void svc_rdma_send_ctxts_destroy(struct svcxprt_rdma *rdma); extern struct svc_rdma_send_ctxt * svc_rdma_send_ctxt_get(struct svcxprt_rdma *rdma); extern void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *ctxt); extern int svc_rdma_post_send(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *ctxt); extern int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *sctxt, const struct svc_rdma_pcl *write_pcl, const struct svc_rdma_pcl *reply_pcl, const struct xdr_buf *xdr); extern void svc_rdma_send_error_msg(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *sctxt, struct svc_rdma_recv_ctxt *rctxt, int status); extern void svc_rdma_wake_send_waiters(struct svcxprt_rdma *rdma, int avail); extern int svc_rdma_sendto(struct svc_rqst *); extern int svc_rdma_result_payload(struct svc_rqst *rqstp, unsigned int offset, unsigned int length); /* svc_rdma_transport.c */ 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 int svc_rdma_init(void); extern void svc_rdma_cleanup(void); #endif
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