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 struct ib_mr *global_mr; 94 u64 mr_page_mask; 95 int mr_page_size; 96 int mr_max_size; 97 int max_pages_per_mr; 98 bool has_fmr; 99 bool has_fr; 100 bool use_fmr; 101 bool use_fast_reg; 102 }; 103 104 struct srp_host { 105 struct srp_device *srp_dev; 106 u8 port; 107 struct device dev; 108 struct list_head target_list; 109 spinlock_t target_lock; 110 struct completion released; 111 struct list_head list; 112 struct mutex add_target_mutex; 113 }; 114 115 struct srp_request { 116 struct scsi_cmnd *scmnd; 117 struct srp_iu *cmd; 118 union { 119 struct ib_pool_fmr **fmr_list; 120 struct srp_fr_desc **fr_list; 121 }; 122 u64 *map_page; 123 struct srp_direct_buf *indirect_desc; 124 dma_addr_t indirect_dma_addr; 125 short nmdesc; 126 struct ib_cqe reg_cqe; 127 }; 128 129 /** 130 * struct srp_rdma_ch 131 * @comp_vector: Completion vector used by this RDMA channel. 132 */ 133 struct srp_rdma_ch { 134 /* These are RW in the hot path, and commonly used together */ 135 struct list_head free_tx; 136 spinlock_t lock; 137 s32 req_lim; 138 139 /* These are read-only in the hot path */ 140 struct srp_target_port *target ____cacheline_aligned_in_smp; 141 struct ib_cq *send_cq; 142 struct ib_cq *recv_cq; 143 struct ib_qp *qp; 144 union { 145 struct ib_fmr_pool *fmr_pool; 146 struct srp_fr_pool *fr_pool; 147 }; 148 149 /* Everything above this point is used in the hot path of 150 * command processing. Try to keep them packed into cachelines. 151 */ 152 153 struct completion done; 154 int status; 155 156 struct ib_sa_path_rec path; 157 struct ib_sa_query *path_query; 158 int path_query_id; 159 160 struct ib_cm_id *cm_id; 161 struct srp_iu **tx_ring; 162 struct srp_iu **rx_ring; 163 struct srp_request *req_ring; 164 int max_ti_iu_len; 165 int comp_vector; 166 167 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_mr *global_mr; 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 queue_size; 206 int req_ring_size; 207 int comp_vector; 208 int tl_retry_count; 209 210 union ib_gid orig_dgid; 211 __be16 pkey; 212 213 u32 rq_tmo_jiffies; 214 215 int zero_req_lim; 216 217 struct work_struct tl_err_work; 218 struct work_struct remove_work; 219 220 struct list_head list; 221 bool qp_in_error; 222 }; 223 224 struct srp_iu { 225 struct list_head list; 226 u64 dma; 227 void *buf; 228 size_t size; 229 enum dma_data_direction direction; 230 struct ib_cqe cqe; 231 }; 232 233 /** 234 * struct srp_fr_desc - fast registration work request arguments 235 * @entry: Entry in srp_fr_pool.free_list. 236 * @mr: Memory region. 237 * @frpl: Fast registration page list. 238 */ 239 struct srp_fr_desc { 240 struct list_head entry; 241 struct ib_mr *mr; 242 }; 243 244 /** 245 * struct srp_fr_pool - pool of fast registration descriptors 246 * 247 * An entry is available for allocation if and only if it occurs in @free_list. 248 * 249 * @size: Number of descriptors in this pool. 250 * @max_page_list_len: Maximum fast registration work request page list length. 251 * @lock: Protects free_list. 252 * @free_list: List of free descriptors. 253 * @desc: Fast registration descriptor pool. 254 */ 255 struct srp_fr_pool { 256 int size; 257 int max_page_list_len; 258 spinlock_t lock; 259 struct list_head free_list; 260 struct srp_fr_desc desc[0]; 261 }; 262 263 /** 264 * struct srp_map_state - per-request DMA memory mapping state 265 * @desc: Pointer to the element of the SRP buffer descriptor array 266 * that is being filled in. 267 * @pages: Array with DMA addresses of pages being considered for 268 * memory registration. 269 * @base_dma_addr: DMA address of the first page that has not yet been mapped. 270 * @dma_len: Number of bytes that will be registered with the next 271 * FMR or FR memory registration call. 272 * @total_len: Total number of bytes in the sg-list being mapped. 273 * @npages: Number of page addresses in the pages[] array. 274 * @nmdesc: Number of FMR or FR memory descriptors used for mapping. 275 * @ndesc: Number of SRP buffer descriptors that have been filled in. 276 */ 277 struct srp_map_state { 278 union { 279 struct { 280 struct ib_pool_fmr **next; 281 struct ib_pool_fmr **end; 282 } fmr; 283 struct { 284 struct srp_fr_desc **next; 285 struct srp_fr_desc **end; 286 } fr; 287 struct { 288 void **next; 289 void **end; 290 } gen; 291 }; 292 struct srp_direct_buf *desc; 293 union { 294 u64 *pages; 295 struct scatterlist *sg; 296 }; 297 dma_addr_t base_dma_addr; 298 u32 dma_len; 299 u32 total_len; 300 unsigned int npages; 301 unsigned int nmdesc; 302 unsigned int ndesc; 303 }; 304 305 #endif /* IB_SRP_H */ 306