/* * Copyright (c) 2003-2007 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. */ #ifndef _LINUX_SUNRPC_XPRT_RDMA_H #define _LINUX_SUNRPC_XPRT_RDMA_H #include /* wait_queue_head_t, etc */ #include /* spinlock_t, etc */ #include /* atomic_t, etc */ #include /* RDMA connection api */ #include /* RDMA verbs api */ #include /* rpc_xprt */ #include /* RPC/RDMA protocol */ #include /* xprt parameters */ /* * Interface Adapter -- one per transport instance */ struct rpcrdma_ia { struct rdma_cm_id *ri_id; struct ib_pd *ri_pd; struct ib_mr *ri_bind_mem; u32 ri_dma_lkey; int ri_have_dma_lkey; struct completion ri_done; int ri_async_rc; enum rpcrdma_memreg ri_memreg_strategy; }; /* * RDMA Endpoint -- one per transport instance */ struct rpcrdma_ep { atomic_t rep_cqcount; int rep_cqinit; int rep_connected; struct rpcrdma_ia *rep_ia; struct ib_cq *rep_cq; struct ib_qp_init_attr rep_attr; wait_queue_head_t rep_connect_wait; struct ib_sge rep_pad; /* holds zeroed pad */ struct ib_mr *rep_pad_mr; /* holds zeroed pad */ void (*rep_func)(struct rpcrdma_ep *); struct rpc_xprt *rep_xprt; /* for rep_func */ struct rdma_conn_param rep_remote_cma; struct sockaddr_storage rep_remote_addr; }; #define INIT_CQCOUNT(ep) atomic_set(&(ep)->rep_cqcount, (ep)->rep_cqinit) #define DECR_CQCOUNT(ep) atomic_sub_return(1, &(ep)->rep_cqcount) /* * struct rpcrdma_rep -- this structure encapsulates state required to recv * and complete a reply, asychronously. It needs several pieces of * state: * o recv buffer (posted to provider) * o ib_sge (also donated to provider) * o status of reply (length, success or not) * o bookkeeping state to get run by tasklet (list, etc) * * These are allocated during initialization, per-transport instance; * however, the tasklet execution list itself is global, as it should * always be pretty short. * * N of these are associated with a transport instance, and stored in * struct rpcrdma_buffer. N is the max number of outstanding requests. */ /* temporary static scatter/gather max */ #define RPCRDMA_MAX_DATA_SEGS (8) /* max scatter/gather */ #define RPCRDMA_MAX_SEGS (RPCRDMA_MAX_DATA_SEGS + 2) /* head+tail = 2 */ #define MAX_RPCRDMAHDR (\ /* max supported RPC/RDMA header */ \ sizeof(struct rpcrdma_msg) + (2 * sizeof(u32)) + \ (sizeof(struct rpcrdma_read_chunk) * RPCRDMA_MAX_SEGS) + sizeof(u32)) struct rpcrdma_buffer; struct rpcrdma_rep { unsigned int rr_len; /* actual received reply length */ struct rpcrdma_buffer *rr_buffer; /* home base for this structure */ struct rpc_xprt *rr_xprt; /* needed for request/reply matching */ void (*rr_func)(struct rpcrdma_rep *);/* called by tasklet in softint */ struct list_head rr_list; /* tasklet list */ wait_queue_head_t rr_unbind; /* optional unbind wait */ struct ib_sge rr_iov; /* for posting */ struct ib_mr *rr_handle; /* handle for mem in rr_iov */ char rr_base[MAX_RPCRDMAHDR]; /* minimal inline receive buffer */ }; /* * struct rpcrdma_req -- structure central to the request/reply sequence. * * N of these are associated with a transport instance, and stored in * struct rpcrdma_buffer. N is the max number of outstanding requests. * * It includes pre-registered buffer memory for send AND recv. * The recv buffer, however, is not owned by this structure, and * is "donated" to the hardware when a recv is posted. When a * reply is handled, the recv buffer used is given back to the * struct rpcrdma_req associated with the request. * * In addition to the basic memory, this structure includes an array * of iovs for send operations. The reason is that the iovs passed to * ib_post_{send,recv} must not be modified until the work request * completes. * * NOTES: * o RPCRDMA_MAX_SEGS is the max number of addressible chunk elements we * marshal. The number needed varies depending on the iov lists that * are passed to us, the memory registration mode we are in, and if * physical addressing is used, the layout. */ struct rpcrdma_mr_seg { /* chunk descriptors */ union { /* chunk memory handles */ struct ib_mr *rl_mr; /* if registered directly */ struct rpcrdma_mw { /* if registered from region */ union { struct ib_mw *mw; struct ib_fmr *fmr; struct { struct ib_fast_reg_page_list *fr_pgl; struct ib_mr *fr_mr; } frmr; } r; struct list_head mw_list; } *rl_mw; } mr_chunk; u64 mr_base; /* registration result */ u32 mr_rkey; /* registration result */ u32 mr_len; /* length of chunk or segment */ int mr_nsegs; /* number of segments in chunk or 0 */ enum dma_data_direction mr_dir; /* segment mapping direction */ dma_addr_t mr_dma; /* segment mapping address */ size_t mr_dmalen; /* segment mapping length */ struct page *mr_page; /* owning page, if any */ char *mr_offset; /* kva if no page, else offset */ }; struct rpcrdma_req { size_t rl_size; /* actual length of buffer */ unsigned int rl_niovs; /* 0, 2 or 4 */ unsigned int rl_nchunks; /* non-zero if chunks */ unsigned int rl_connect_cookie; /* retry detection */ struct rpcrdma_buffer *rl_buffer; /* home base for this structure */ struct rpcrdma_rep *rl_reply;/* holder for reply buffer */ struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS];/* chunk segments */ struct ib_sge rl_send_iov[4]; /* for active requests */ struct ib_sge rl_iov; /* for posting */ struct ib_mr *rl_handle; /* handle for mem in rl_iov */ char rl_base[MAX_RPCRDMAHDR]; /* start of actual buffer */ __u32 rl_xdr_buf[0]; /* start of returned rpc rq_buffer */ }; #define rpcr_to_rdmar(r) \ container_of((r)->rq_buffer, struct rpcrdma_req, rl_xdr_buf[0]) /* * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for * inline requests/replies, and client/server credits. * * One of these is associated with a transport instance */ struct rpcrdma_buffer { spinlock_t rb_lock; /* protects indexes */ atomic_t rb_credits; /* most recent server credits */ unsigned long rb_cwndscale; /* cached framework rpc_cwndscale */ int rb_max_requests;/* client max requests */ struct list_head rb_mws; /* optional memory windows/fmrs/frmrs */ int rb_send_index; struct rpcrdma_req **rb_send_bufs; int rb_recv_index; struct rpcrdma_rep **rb_recv_bufs; char *rb_pool; }; #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia) /* * Internal structure for transport instance creation. This * exists primarily for modularity. * * This data should be set with mount options */ struct rpcrdma_create_data_internal { struct sockaddr_storage addr; /* RDMA server address */ unsigned int max_requests; /* max requests (slots) in flight */ unsigned int rsize; /* mount rsize - max read hdr+data */ unsigned int wsize; /* mount wsize - max write hdr+data */ unsigned int inline_rsize; /* max non-rdma read data payload */ unsigned int inline_wsize; /* max non-rdma write data payload */ unsigned int padding; /* non-rdma write header padding */ }; #define RPCRDMA_INLINE_READ_THRESHOLD(rq) \ (rpcx_to_rdmad(rq->rq_task->tk_xprt).inline_rsize) #define RPCRDMA_INLINE_WRITE_THRESHOLD(rq)\ (rpcx_to_rdmad(rq->rq_task->tk_xprt).inline_wsize) #define RPCRDMA_INLINE_PAD_VALUE(rq)\ rpcx_to_rdmad(rq->rq_task->tk_xprt).padding /* * Statistics for RPCRDMA */ struct rpcrdma_stats { unsigned long read_chunk_count; unsigned long write_chunk_count; unsigned long reply_chunk_count; unsigned long long total_rdma_request; unsigned long long total_rdma_reply; unsigned long long pullup_copy_count; unsigned long long fixup_copy_count; unsigned long hardway_register_count; unsigned long failed_marshal_count; unsigned long bad_reply_count; }; /* * RPCRDMA transport -- encapsulates the structures above for * integration with RPC. * * The contained structures are embedded, not pointers, * for convenience. This structure need not be visible externally. * * It is allocated and initialized during mount, and released * during unmount. */ struct rpcrdma_xprt { struct rpc_xprt xprt; struct rpcrdma_ia rx_ia; struct rpcrdma_ep rx_ep; struct rpcrdma_buffer rx_buf; struct rpcrdma_create_data_internal rx_data; struct delayed_work rdma_connect; struct rpcrdma_stats rx_stats; }; #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, xprt) #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data) /* Setting this to 0 ensures interoperability with early servers. * Setting this to 1 enhances certain unaligned read/write performance. * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ extern int xprt_rdma_pad_optimize; /* * Interface Adapter calls - xprtrdma/verbs.c */ int rpcrdma_ia_open(struct rpcrdma_xprt *, struct sockaddr *, int); void rpcrdma_ia_close(struct rpcrdma_ia *); /* * Endpoint calls - xprtrdma/verbs.c */ int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *, struct rpcrdma_create_data_internal *); int rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *); int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); int rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *); int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *, struct rpcrdma_req *); int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_ep *, struct rpcrdma_rep *); /* * Buffer calls - xprtrdma/verbs.c */ int rpcrdma_buffer_create(struct rpcrdma_buffer *, struct rpcrdma_ep *, struct rpcrdma_ia *, struct rpcrdma_create_data_internal *); void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); void rpcrdma_buffer_put(struct rpcrdma_req *); void rpcrdma_recv_buffer_get(struct rpcrdma_req *); void rpcrdma_recv_buffer_put(struct rpcrdma_rep *); int rpcrdma_register_internal(struct rpcrdma_ia *, void *, int, struct ib_mr **, struct ib_sge *); int rpcrdma_deregister_internal(struct rpcrdma_ia *, struct ib_mr *, struct ib_sge *); int rpcrdma_register_external(struct rpcrdma_mr_seg *, int, int, struct rpcrdma_xprt *); int rpcrdma_deregister_external(struct rpcrdma_mr_seg *, struct rpcrdma_xprt *, void *); /* * RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c */ void rpcrdma_conn_func(struct rpcrdma_ep *); void rpcrdma_reply_handler(struct rpcrdma_rep *); /* * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c */ int rpcrdma_marshal_req(struct rpc_rqst *); #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */