/* * 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 /* struct work_struct */ #include /* RDMA connection api */ #include /* RDMA verbs api */ #include /* rpc_xprt */ #include /* RPC/RDMA protocol */ #include /* xprt parameters */ #include /* RPCSVC_MAXPAYLOAD */ #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */ #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */ /* * Interface Adapter -- one per transport instance */ struct rpcrdma_ia { const struct rpcrdma_memreg_ops *ri_ops; rwlock_t ri_qplock; 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; unsigned int ri_max_frmr_depth; struct ib_device_attr ri_devattr; struct ib_qp_attr ri_qp_attr; struct ib_qp_init_attr ri_qp_init_attr; }; /* * RDMA Endpoint -- one per transport instance */ #define RPCRDMA_WC_BUDGET (128) #define RPCRDMA_POLLSIZE (16) struct rpcrdma_ep { atomic_t rep_cqcount; int rep_cqinit; int rep_connected; struct ib_qp_init_attr rep_attr; wait_queue_head_t rep_connect_wait; struct rpcrdma_regbuf *rep_padbuf; struct rdma_conn_param rep_remote_cma; struct sockaddr_storage rep_remote_addr; struct delayed_work rep_connect_worker; struct ib_wc rep_send_wcs[RPCRDMA_POLLSIZE]; struct ib_wc rep_recv_wcs[RPCRDMA_POLLSIZE]; }; /* * Force a signaled SEND Work Request every so often, * in case the provider needs to do some housekeeping. */ #define RPCRDMA_MAX_UNSIGNALED_SENDS (32) #define INIT_CQCOUNT(ep) atomic_set(&(ep)->rep_cqcount, (ep)->rep_cqinit) #define DECR_CQCOUNT(ep) atomic_sub_return(1, &(ep)->rep_cqcount) /* Force completion handler to ignore the signal */ #define RPCRDMA_IGNORE_COMPLETION (0ULL) /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV * * The below structure appears at the front of a large region of kmalloc'd * memory, which always starts on a good alignment boundary. */ struct rpcrdma_regbuf { size_t rg_size; struct rpcrdma_req *rg_owner; struct ib_mr *rg_mr; struct ib_sge rg_iov; __be32 rg_base[0] __attribute__ ((aligned(256))); }; static inline u64 rdmab_addr(struct rpcrdma_regbuf *rb) { return rb->rg_iov.addr; } static inline u32 rdmab_length(struct rpcrdma_regbuf *rb) { return rb->rg_iov.length; } static inline u32 rdmab_lkey(struct rpcrdma_regbuf *rb) { return rb->rg_iov.lkey; } static inline struct rpcrdma_msg * rdmab_to_msg(struct rpcrdma_regbuf *rb) { return (struct rpcrdma_msg *)rb->rg_base; } /* * 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 (64) /* max scatter/gather */ #define RPCRDMA_MAX_SEGS (RPCRDMA_MAX_DATA_SEGS + 2) /* head+tail = 2 */ struct rpcrdma_buffer; struct rpcrdma_rep { unsigned int rr_len; struct rpcrdma_xprt *rr_rxprt; void (*rr_func)(struct rpcrdma_rep *); struct list_head rr_list; struct rpcrdma_regbuf *rr_rdmabuf; }; /* * struct rpcrdma_mw - external memory region metadata * * An external memory region is any buffer or page that is registered * on the fly (ie, not pre-registered). * * Each rpcrdma_buffer has a list of free MWs anchored in rb_mws. During * call_allocate, rpcrdma_buffer_get() assigns one to each segment in * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep * track of registration metadata while each RPC is pending. * rpcrdma_deregister_external() uses this metadata to unmap and * release these resources when an RPC is complete. */ enum rpcrdma_frmr_state { FRMR_IS_INVALID, /* ready to be used */ FRMR_IS_VALID, /* in use */ FRMR_IS_STALE, /* failed completion */ }; struct rpcrdma_frmr { struct ib_fast_reg_page_list *fr_pgl; struct ib_mr *fr_mr; enum rpcrdma_frmr_state fr_state; }; struct rpcrdma_mw { union { struct ib_fmr *fmr; struct rpcrdma_frmr frmr; } r; void (*mw_sendcompletion)(struct ib_wc *); struct list_head mw_list; struct list_head mw_all; }; /* * 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 */ struct rpcrdma_mw *rl_mw; /* registered MR */ 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 { 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 ib_sge rl_send_iov[4]; /* for active requests */ struct rpcrdma_regbuf *rl_rdmabuf; struct rpcrdma_regbuf *rl_sendbuf; struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; }; static inline struct rpcrdma_req * rpcr_to_rdmar(struct rpc_rqst *rqst) { void *buffer = rqst->rq_buffer; struct rpcrdma_regbuf *rb; rb = container_of(buffer, struct rpcrdma_regbuf, rg_base); return rb->rg_owner; } /* * 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 */ u32 rb_max_requests;/* client max requests */ struct list_head rb_mws; /* optional memory windows/fmrs/frmrs */ struct list_head rb_all; 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_xprt).inline_rsize) #define RPCRDMA_INLINE_WRITE_THRESHOLD(rq)\ (rpcx_to_rdmad(rq->rq_xprt).inline_wsize) #define RPCRDMA_INLINE_PAD_VALUE(rq)\ rpcx_to_rdmad(rq->rq_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; }; /* * Per-registration mode operations */ struct rpcrdma_xprt; struct rpcrdma_memreg_ops { int (*ro_map)(struct rpcrdma_xprt *, struct rpcrdma_mr_seg *, int, bool); int (*ro_unmap)(struct rpcrdma_xprt *, struct rpcrdma_mr_seg *); int (*ro_open)(struct rpcrdma_ia *, struct rpcrdma_ep *, struct rpcrdma_create_data_internal *); size_t (*ro_maxpages)(struct rpcrdma_xprt *); int (*ro_init)(struct rpcrdma_xprt *); void (*ro_reset)(struct rpcrdma_xprt *); void (*ro_destroy)(struct rpcrdma_buffer *); const char *ro_displayname; }; extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops; extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops; extern const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops; /* * 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 rx_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 rx_connect_worker; struct rpcrdma_stats rx_stats; }; #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_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 *); void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *); int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); void 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_xprt *); 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 *); struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(struct rpcrdma_ia *, size_t, gfp_t); void rpcrdma_free_regbuf(struct rpcrdma_ia *, struct rpcrdma_regbuf *); unsigned int rpcrdma_max_segments(struct rpcrdma_xprt *); /* * Wrappers for chunk registration, shared by read/write chunk code. */ void rpcrdma_mapping_error(struct rpcrdma_mr_seg *); static inline enum dma_data_direction rpcrdma_data_dir(bool writing) { return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; } static inline void rpcrdma_map_one(struct ib_device *device, struct rpcrdma_mr_seg *seg, enum dma_data_direction direction) { seg->mr_dir = direction; seg->mr_dmalen = seg->mr_len; if (seg->mr_page) seg->mr_dma = ib_dma_map_page(device, seg->mr_page, offset_in_page(seg->mr_offset), seg->mr_dmalen, seg->mr_dir); else seg->mr_dma = ib_dma_map_single(device, seg->mr_offset, seg->mr_dmalen, seg->mr_dir); if (ib_dma_mapping_error(device, seg->mr_dma)) rpcrdma_mapping_error(seg); } static inline void rpcrdma_unmap_one(struct ib_device *device, struct rpcrdma_mr_seg *seg) { if (seg->mr_page) ib_dma_unmap_page(device, seg->mr_dma, seg->mr_dmalen, seg->mr_dir); else ib_dma_unmap_single(device, seg->mr_dma, seg->mr_dmalen, seg->mr_dir); } /* * RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c */ void rpcrdma_connect_worker(struct work_struct *); 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 *); /* Temporary NFS request map cache. Created in svc_rdma.c */ extern struct kmem_cache *svc_rdma_map_cachep; /* WR context cache. Created in svc_rdma.c */ extern struct kmem_cache *svc_rdma_ctxt_cachep; /* Workqueue created in svc_rdma.c */ extern struct workqueue_struct *svc_rdma_wq; #if RPCSVC_MAXPAYLOAD < (RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT) #define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD #else #define RPCSVC_MAXPAYLOAD_RDMA (RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT) #endif #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */