1 /* 2 * Copyright (c) 2005 Cisco Systems. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #ifndef IB_SRP_H 34 #define IB_SRP_H 35 36 #include <linux/types.h> 37 #include <linux/list.h> 38 #include <linux/mutex.h> 39 #include <linux/scatterlist.h> 40 41 #include <scsi/scsi_host.h> 42 #include <scsi/scsi_cmnd.h> 43 44 #include <rdma/ib_verbs.h> 45 #include <rdma/ib_sa.h> 46 #include <rdma/ib_cm.h> 47 #include <rdma/ib_fmr_pool.h> 48 49 enum { 50 SRP_PATH_REC_TIMEOUT_MS = 1000, 51 SRP_ABORT_TIMEOUT_MS = 5000, 52 53 SRP_PORT_REDIRECT = 1, 54 SRP_DLID_REDIRECT = 2, 55 SRP_STALE_CONN = 3, 56 57 SRP_DEF_SG_TABLESIZE = 12, 58 59 SRP_DEFAULT_QUEUE_SIZE = 1 << 6, 60 SRP_RSP_SQ_SIZE = 1, 61 SRP_TSK_MGMT_SQ_SIZE = 1, 62 SRP_DEFAULT_CMD_SQ_SIZE = SRP_DEFAULT_QUEUE_SIZE - SRP_RSP_SQ_SIZE - 63 SRP_TSK_MGMT_SQ_SIZE, 64 65 SRP_TAG_NO_REQ = ~0U, 66 SRP_TAG_TSK_MGMT = 1U << 31, 67 68 SRP_MAX_PAGES_PER_MR = 512, 69 }; 70 71 enum srp_target_state { 72 SRP_TARGET_SCANNING, 73 SRP_TARGET_LIVE, 74 SRP_TARGET_REMOVED, 75 }; 76 77 enum srp_iu_type { 78 SRP_IU_CMD, 79 SRP_IU_TSK_MGMT, 80 SRP_IU_RSP, 81 }; 82 83 /* 84 * @mr_page_mask: HCA memory registration page mask. 85 * @mr_page_size: HCA memory registration page size. 86 * @mr_max_size: Maximum size in bytes of a single FMR / FR registration 87 * request. 88 */ 89 struct srp_device { 90 struct list_head dev_list; 91 struct ib_device *dev; 92 struct ib_pd *pd; 93 u64 mr_page_mask; 94 int mr_page_size; 95 int mr_max_size; 96 int max_pages_per_mr; 97 bool has_fmr; 98 bool has_fr; 99 bool use_fmr; 100 bool use_fast_reg; 101 }; 102 103 struct srp_host { 104 struct srp_device *srp_dev; 105 u8 port; 106 struct device dev; 107 struct list_head target_list; 108 spinlock_t target_lock; 109 struct completion released; 110 struct list_head list; 111 struct mutex add_target_mutex; 112 }; 113 114 struct srp_request { 115 struct scsi_cmnd *scmnd; 116 struct srp_iu *cmd; 117 union { 118 struct ib_pool_fmr **fmr_list; 119 struct srp_fr_desc **fr_list; 120 }; 121 u64 *map_page; 122 struct srp_direct_buf *indirect_desc; 123 dma_addr_t indirect_dma_addr; 124 short nmdesc; 125 struct ib_cqe reg_cqe; 126 }; 127 128 /** 129 * struct srp_rdma_ch 130 * @comp_vector: Completion vector used by this RDMA channel. 131 */ 132 struct srp_rdma_ch { 133 /* These are RW in the hot path, and commonly used together */ 134 struct list_head free_tx; 135 spinlock_t lock; 136 s32 req_lim; 137 138 /* These are read-only in the hot path */ 139 struct srp_target_port *target ____cacheline_aligned_in_smp; 140 struct ib_cq *send_cq; 141 struct ib_cq *recv_cq; 142 struct ib_qp *qp; 143 union { 144 struct ib_fmr_pool *fmr_pool; 145 struct srp_fr_pool *fr_pool; 146 }; 147 148 /* Everything above this point is used in the hot path of 149 * command processing. Try to keep them packed into cachelines. 150 */ 151 152 struct completion done; 153 int status; 154 155 struct ib_sa_path_rec path; 156 struct ib_sa_query *path_query; 157 int path_query_id; 158 159 struct ib_cm_id *cm_id; 160 struct srp_iu **tx_ring; 161 struct srp_iu **rx_ring; 162 struct srp_request *req_ring; 163 int max_ti_iu_len; 164 int comp_vector; 165 166 u64 tsk_mgmt_tag; 167 struct completion tsk_mgmt_done; 168 u8 tsk_mgmt_status; 169 bool connected; 170 }; 171 172 /** 173 * struct srp_target_port 174 * @comp_vector: Completion vector used by the first RDMA channel created for 175 * this target port. 176 */ 177 struct srp_target_port { 178 /* read and written in the hot path */ 179 spinlock_t lock; 180 181 /* read only in the hot path */ 182 struct ib_pd *pd; 183 struct srp_rdma_ch *ch; 184 u32 ch_count; 185 u32 lkey; 186 enum srp_target_state state; 187 unsigned int max_iu_len; 188 unsigned int cmd_sg_cnt; 189 unsigned int indirect_size; 190 bool allow_ext_sg; 191 192 /* other member variables */ 193 union ib_gid sgid; 194 __be64 id_ext; 195 __be64 ioc_guid; 196 __be64 service_id; 197 __be64 initiator_ext; 198 u16 io_class; 199 struct srp_host *srp_host; 200 struct Scsi_Host *scsi_host; 201 struct srp_rport *rport; 202 char target_name[32]; 203 unsigned int scsi_id; 204 unsigned int sg_tablesize; 205 int mr_pool_size; 206 int mr_per_cmd; 207 int queue_size; 208 int req_ring_size; 209 int comp_vector; 210 int tl_retry_count; 211 212 union ib_gid orig_dgid; 213 __be16 pkey; 214 215 u32 rq_tmo_jiffies; 216 217 int zero_req_lim; 218 219 struct work_struct tl_err_work; 220 struct work_struct remove_work; 221 222 struct list_head list; 223 bool qp_in_error; 224 }; 225 226 struct srp_iu { 227 struct list_head list; 228 u64 dma; 229 void *buf; 230 size_t size; 231 enum dma_data_direction direction; 232 struct ib_cqe cqe; 233 }; 234 235 /** 236 * struct srp_fr_desc - fast registration work request arguments 237 * @entry: Entry in srp_fr_pool.free_list. 238 * @mr: Memory region. 239 * @frpl: Fast registration page list. 240 */ 241 struct srp_fr_desc { 242 struct list_head entry; 243 struct ib_mr *mr; 244 }; 245 246 /** 247 * struct srp_fr_pool - pool of fast registration descriptors 248 * 249 * An entry is available for allocation if and only if it occurs in @free_list. 250 * 251 * @size: Number of descriptors in this pool. 252 * @max_page_list_len: Maximum fast registration work request page list length. 253 * @lock: Protects free_list. 254 * @free_list: List of free descriptors. 255 * @desc: Fast registration descriptor pool. 256 */ 257 struct srp_fr_pool { 258 int size; 259 int max_page_list_len; 260 spinlock_t lock; 261 struct list_head free_list; 262 struct srp_fr_desc desc[0]; 263 }; 264 265 /** 266 * struct srp_map_state - per-request DMA memory mapping state 267 * @desc: Pointer to the element of the SRP buffer descriptor array 268 * that is being filled in. 269 * @pages: Array with DMA addresses of pages being considered for 270 * memory registration. 271 * @base_dma_addr: DMA address of the first page that has not yet been mapped. 272 * @dma_len: Number of bytes that will be registered with the next 273 * FMR or FR memory registration call. 274 * @total_len: Total number of bytes in the sg-list being mapped. 275 * @npages: Number of page addresses in the pages[] array. 276 * @nmdesc: Number of FMR or FR memory descriptors used for mapping. 277 * @ndesc: Number of SRP buffer descriptors that have been filled in. 278 */ 279 struct srp_map_state { 280 union { 281 struct { 282 struct ib_pool_fmr **next; 283 struct ib_pool_fmr **end; 284 } fmr; 285 struct { 286 struct srp_fr_desc **next; 287 struct srp_fr_desc **end; 288 } fr; 289 struct { 290 void **next; 291 void **end; 292 } gen; 293 }; 294 struct srp_direct_buf *desc; 295 union { 296 u64 *pages; 297 struct scatterlist *sg; 298 }; 299 dma_addr_t base_dma_addr; 300 u32 dma_len; 301 u32 total_len; 302 unsigned int npages; 303 unsigned int nmdesc; 304 unsigned int ndesc; 305 }; 306 307 #endif /* IB_SRP_H */ 308