| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Chuck Lever | 1392 | 77.81% | 151 | 90.42% |
| Talpey, Thomas | 358 | 20.01% | 4 | 2.40% |
| Trond Myklebust | 11 | 0.61% | 3 | 1.80% |
| Linus Torvalds (pre-git) | 10 | 0.56% | 3 | 1.80% |
| Tom Talpey | 7 | 0.39% | 2 | 1.20% |
| Andy Adamson | 4 | 0.22% | 1 | 0.60% |
| Steve Wise | 3 | 0.17% | 1 | 0.60% |
| Tom Tucker | 3 | 0.17% | 1 | 0.60% |
| Arun Sharma | 1 | 0.06% | 1 | 0.60% |
| Total | 1789 | 167 |
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ /* * Copyright (c) 2014-2017 Oracle. All rights reserved. * 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 <linux/wait.h> /* wait_queue_head_t, etc */ #include <linux/spinlock.h> /* spinlock_t, etc */ #include <linux/atomic.h> /* atomic_t, etc */ #include <linux/kref.h> /* struct kref */ #include <linux/workqueue.h> /* struct work_struct */ #include <linux/llist.h> #include <rdma/rdma_cm.h> /* RDMA connection api */ #include <rdma/ib_verbs.h> /* RDMA verbs api */ #include <linux/sunrpc/clnt.h> /* rpc_xprt */ #include <linux/sunrpc/rpc_rdma_cid.h> /* completion IDs */ #include <linux/sunrpc/rpc_rdma.h> /* RPC/RDMA protocol */ #include <linux/sunrpc/xprtrdma.h> /* xprt parameters */ #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */ #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */ #define RPCRDMA_BIND_TO (60U * HZ) #define RPCRDMA_INIT_REEST_TO (5U * HZ) #define RPCRDMA_MAX_REEST_TO (30U * HZ) #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ) /* * RDMA Endpoint -- connection endpoint details */ struct rpcrdma_mr; struct rpcrdma_ep { struct kref re_kref; struct rdma_cm_id *re_id; struct ib_pd *re_pd; unsigned int re_max_rdma_segs; unsigned int re_max_fr_depth; struct rpcrdma_mr *re_write_pad_mr; enum ib_mr_type re_mrtype; struct completion re_done; unsigned int re_send_count; unsigned int re_send_batch; unsigned int re_max_inline_send; unsigned int re_max_inline_recv; int re_async_rc; int re_connect_status; atomic_t re_receiving; atomic_t re_force_disconnect; struct ib_qp_init_attr re_attr; wait_queue_head_t re_connect_wait; struct rpc_xprt *re_xprt; struct rpcrdma_connect_private re_cm_private; struct rdma_conn_param re_remote_cma; int re_receive_count; unsigned int re_max_requests; /* depends on device */ unsigned int re_inline_send; /* negotiated */ unsigned int re_inline_recv; /* negotiated */ atomic_t re_completion_ids; char re_write_pad[XDR_UNIT]; }; /* Pre-allocate extra Work Requests for handling reverse-direction * Receives and Sends. This is a fixed value because the Work Queues * are allocated when the forward channel is set up, long before the * backchannel is provisioned. This value is two times * NFS4_DEF_CB_SLOT_TABLE_SIZE. */ #if defined(CONFIG_SUNRPC_BACKCHANNEL) #define RPCRDMA_BACKWARD_WRS (32) #else #define RPCRDMA_BACKWARD_WRS (0) #endif /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV */ struct rpcrdma_regbuf { struct ib_sge rg_iov; struct ib_device *rg_device; enum dma_data_direction rg_direction; void *rg_data; }; 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 ib_device *rdmab_device(struct rpcrdma_regbuf *rb) { return rb->rg_device; } static inline void *rdmab_data(const struct rpcrdma_regbuf *rb) { return rb->rg_data; } /* Do not use emergency memory reserves, and fail quickly if memory * cannot be allocated easily. These flags may be used wherever there * is robust logic to handle a failure to allocate. */ #define XPRTRDMA_GFP_FLAGS (__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN) /* To ensure a transport can always make forward progress, * the number of RDMA segments allowed in header chunk lists * is capped at 16. This prevents less-capable devices from * overrunning the Send buffer while building chunk lists. * * Elements of the Read list take up more room than the * Write list or Reply chunk. 16 read segments means the * chunk lists cannot consume more than * * ((16 + 2) * read segment size) + 1 XDR words, * * or about 400 bytes. The fixed part of the header is * another 24 bytes. Thus when the inline threshold is * 1024 bytes, at least 600 bytes are available for RPC * message bodies. */ enum { RPCRDMA_MAX_HDR_SEGS = 16, }; /* * struct rpcrdma_rep -- this structure encapsulates state required * to receive and complete an RPC Reply, asychronously. It needs * several pieces of state: * * o receive buffer and ib_sge (donated to provider) * o status of receive (success or not, length, inv rkey) * o bookkeeping state to get run by reply handler (XDR stream) * * These structures are allocated during transport initialization. * N of these are associated with a transport instance, managed by * struct rpcrdma_buffer. N is the max number of outstanding RPCs. */ struct rpcrdma_rep { struct ib_cqe rr_cqe; struct rpc_rdma_cid rr_cid; __be32 rr_xid; __be32 rr_vers; __be32 rr_proc; int rr_wc_flags; u32 rr_inv_rkey; bool rr_temp; struct rpcrdma_regbuf *rr_rdmabuf; struct rpcrdma_xprt *rr_rxprt; struct rpc_rqst *rr_rqst; struct xdr_buf rr_hdrbuf; struct xdr_stream rr_stream; struct llist_node rr_node; struct ib_recv_wr rr_recv_wr; struct list_head rr_all; }; /* To reduce the rate at which a transport invokes ib_post_recv * (and thus the hardware doorbell rate), xprtrdma posts Receive * WRs in batches. * * Setting this to zero disables Receive post batching. */ enum { RPCRDMA_MAX_RECV_BATCH = 7, }; /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes */ struct rpcrdma_req; struct rpcrdma_sendctx { struct ib_cqe sc_cqe; struct rpc_rdma_cid sc_cid; struct rpcrdma_req *sc_req; unsigned int sc_unmap_count; struct ib_sge sc_sges[]; }; /* * struct rpcrdma_mr - external memory region metadata * * An external memory region is any buffer or page that is registered * on the fly (ie, not pre-registered). */ struct rpcrdma_req; struct rpcrdma_mr { struct list_head mr_list; struct rpcrdma_req *mr_req; struct ib_mr *mr_ibmr; struct ib_device *mr_device; struct scatterlist *mr_sg; int mr_nents; enum dma_data_direction mr_dir; struct ib_cqe mr_cqe; struct completion mr_linv_done; union { struct ib_reg_wr mr_regwr; struct ib_send_wr mr_invwr; }; struct rpcrdma_xprt *mr_xprt; u32 mr_handle; u32 mr_length; u64 mr_offset; struct list_head mr_all; struct rpc_rdma_cid mr_cid; }; /* * 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. */ /* Maximum number of page-sized "segments" per chunk list to be * registered or invalidated. Must handle a Reply chunk: */ enum { RPCRDMA_MAX_IOV_SEGS = 3, RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1, RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS + RPCRDMA_MAX_IOV_SEGS, }; /* Arguments for DMA mapping and registration */ struct rpcrdma_mr_seg { u32 mr_len; /* length of segment */ struct page *mr_page; /* underlying struct page */ u64 mr_offset; /* IN: page offset, OUT: iova */ }; /* The Send SGE array is provisioned to send a maximum size * inline request: * - RPC-over-RDMA header * - xdr_buf head iovec * - RPCRDMA_MAX_INLINE bytes, in pages * - xdr_buf tail iovec * * The actual number of array elements consumed by each RPC * depends on the device's max_sge limit. */ enum { RPCRDMA_MIN_SEND_SGES = 3, RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT, RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1, }; struct rpcrdma_buffer; struct rpcrdma_req { struct list_head rl_list; struct rpc_rqst rl_slot; struct rpcrdma_rep *rl_reply; struct xdr_stream rl_stream; struct xdr_buf rl_hdrbuf; struct ib_send_wr rl_wr; struct rpcrdma_sendctx *rl_sendctx; struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */ struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */ struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */ struct list_head rl_all; struct kref rl_kref; struct list_head rl_free_mrs; struct list_head rl_registered; struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; }; static inline struct rpcrdma_req * rpcr_to_rdmar(const struct rpc_rqst *rqst) { return container_of(rqst, struct rpcrdma_req, rl_slot); } static inline void rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list) { list_add(&mr->mr_list, list); } static inline struct rpcrdma_mr * rpcrdma_mr_pop(struct list_head *list) { struct rpcrdma_mr *mr; mr = list_first_entry_or_null(list, struct rpcrdma_mr, mr_list); if (mr) list_del_init(&mr->mr_list); return mr; } /* * 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; struct list_head rb_send_bufs; struct list_head rb_mrs; unsigned long rb_sc_head; unsigned long rb_sc_tail; unsigned long rb_sc_last; struct rpcrdma_sendctx **rb_sc_ctxs; struct list_head rb_allreqs; struct list_head rb_all_mrs; struct list_head rb_all_reps; struct llist_head rb_free_reps; __be32 rb_max_requests; u32 rb_credits; /* most recent credit grant */ u32 rb_bc_srv_max_requests; u32 rb_bc_max_requests; struct work_struct rb_refresh_worker; }; /* * Statistics for RPCRDMA */ struct rpcrdma_stats { /* accessed when sending a call */ unsigned long read_chunk_count; unsigned long write_chunk_count; unsigned long reply_chunk_count; unsigned long long total_rdma_request; /* rarely accessed error counters */ unsigned long long pullup_copy_count; unsigned long hardway_register_count; unsigned long failed_marshal_count; unsigned long bad_reply_count; unsigned long mrs_recycled; unsigned long mrs_orphaned; unsigned long mrs_allocated; unsigned long empty_sendctx_q; /* accessed when receiving a reply */ unsigned long long total_rdma_reply; unsigned long long fixup_copy_count; unsigned long reply_waits_for_send; unsigned long local_inv_needed; unsigned long nomsg_call_count; unsigned long bcall_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 rx_xprt; struct rpcrdma_ep *rx_ep; struct rpcrdma_buffer rx_buf; struct delayed_work rx_connect_worker; struct rpc_timeout rx_timeout; struct rpcrdma_stats rx_stats; }; #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) static inline const char * rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt) { return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR]; } static inline const char * rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt) { return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT]; } /* 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; /* This setting controls the hunt for a supported memory * registration strategy. */ extern unsigned int xprt_rdma_memreg_strategy; /* * Endpoint calls - xprtrdma/verbs.c */ void rpcrdma_force_disconnect(struct rpcrdma_ep *ep); void rpcrdma_flush_disconnect(struct rpcrdma_xprt *r_xprt, struct ib_wc *wc); int rpcrdma_xprt_connect(struct rpcrdma_xprt *r_xprt); void rpcrdma_xprt_disconnect(struct rpcrdma_xprt *r_xprt); void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, int needed, bool temp); /* * Buffer calls - xprtrdma/verbs.c */ struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, size_t size); int rpcrdma_req_setup(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); void rpcrdma_req_destroy(struct rpcrdma_req *req); int rpcrdma_buffer_create(struct rpcrdma_xprt *); void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt); struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt); void rpcrdma_mrs_refresh(struct rpcrdma_xprt *r_xprt); struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req); void rpcrdma_rep_put(struct rpcrdma_buffer *buf, struct rpcrdma_rep *rep); void rpcrdma_reply_put(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req); bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size, gfp_t flags); bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_regbuf *rb); /** * rpcrdma_regbuf_is_mapped - check if buffer is DMA mapped * * Returns true if the buffer is now mapped to rb->rg_device. */ static inline bool rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb) { return rb->rg_device != NULL; } /** * rpcrdma_regbuf_dma_map - DMA-map a regbuf * @r_xprt: controlling transport instance * @rb: regbuf to be mapped * * Returns true if the buffer is currently DMA mapped. */ static inline bool rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_regbuf *rb) { if (likely(rpcrdma_regbuf_is_mapped(rb))) return true; return __rpcrdma_regbuf_dma_map(r_xprt, rb); } /* * Wrappers for chunk registration, shared by read/write chunk code. */ static inline enum dma_data_direction rpcrdma_data_dir(bool writing) { return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; } /* Memory registration calls xprtrdma/frwr_ops.c */ void frwr_reset(struct rpcrdma_req *req); int frwr_query_device(struct rpcrdma_ep *ep, const struct ib_device *device); int frwr_mr_init(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr *mr); void frwr_mr_release(struct rpcrdma_mr *mr); struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg, int nsegs, bool writing, __be32 xid, struct rpcrdma_mr *mr); int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs); void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); int frwr_wp_create(struct rpcrdma_xprt *r_xprt); /* * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c */ enum rpcrdma_chunktype { rpcrdma_noch = 0, rpcrdma_noch_pullup, rpcrdma_noch_mapped, rpcrdma_readch, rpcrdma_areadch, rpcrdma_writech, rpcrdma_replych }; int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, u32 hdrlen, struct xdr_buf *xdr, enum rpcrdma_chunktype rtype); void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc); int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst); void rpcrdma_set_max_header_sizes(struct rpcrdma_ep *ep); void rpcrdma_reset_cwnd(struct rpcrdma_xprt *r_xprt); void rpcrdma_complete_rqst(struct rpcrdma_rep *rep); void rpcrdma_unpin_rqst(struct rpcrdma_rep *rep); void rpcrdma_reply_handler(struct rpcrdma_rep *rep); static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len) { xdr->head[0].iov_len = len; xdr->len = len; } /* RPC/RDMA module init - xprtrdma/transport.c */ extern unsigned int xprt_rdma_max_inline_read; extern unsigned int xprt_rdma_max_inline_write; void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); void xprt_rdma_free_addresses(struct rpc_xprt *xprt); void xprt_rdma_close(struct rpc_xprt *xprt); void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); int xprt_rdma_init(void); void xprt_rdma_cleanup(void); /* Backchannel calls - xprtrdma/backchannel.c */ #if defined(CONFIG_SUNRPC_BACKCHANNEL) int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); unsigned int xprt_rdma_bc_max_slots(struct rpc_xprt *); void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst); void xprt_rdma_bc_free_rqst(struct rpc_rqst *); void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); #endif /* CONFIG_SUNRPC_BACKCHANNEL */ extern struct xprt_class xprt_rdma_bc; #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */
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