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_MAX_LUN = 512, 58 SRP_DEF_SG_TABLESIZE = 12, 59 60 SRP_DEFAULT_QUEUE_SIZE = 1 << 6, 61 SRP_RSP_SQ_SIZE = 1, 62 SRP_TSK_MGMT_SQ_SIZE = 1, 63 SRP_DEFAULT_CMD_SQ_SIZE = SRP_DEFAULT_QUEUE_SIZE - SRP_RSP_SQ_SIZE - 64 SRP_TSK_MGMT_SQ_SIZE, 65 66 SRP_TAG_NO_REQ = ~0U, 67 SRP_TAG_TSK_MGMT = 1U << 31, 68 69 SRP_FMR_SIZE = 512, 70 SRP_FMR_MIN_SIZE = 128, 71 SRP_FMR_POOL_SIZE = 1024, 72 SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4, 73 74 SRP_MAP_ALLOW_FMR = 0, 75 SRP_MAP_NO_FMR = 1, 76 }; 77 78 enum srp_target_state { 79 SRP_TARGET_LIVE, 80 SRP_TARGET_REMOVED, 81 }; 82 83 enum srp_iu_type { 84 SRP_IU_CMD, 85 SRP_IU_TSK_MGMT, 86 SRP_IU_RSP, 87 }; 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 *mr; 94 struct ib_fmr_pool *fmr_pool; 95 u64 fmr_page_mask; 96 int fmr_page_size; 97 int fmr_max_size; 98 }; 99 100 struct srp_host { 101 struct srp_device *srp_dev; 102 u8 port; 103 struct device dev; 104 struct list_head target_list; 105 spinlock_t target_lock; 106 struct completion released; 107 struct list_head list; 108 struct mutex add_target_mutex; 109 }; 110 111 struct srp_request { 112 struct list_head list; 113 struct scsi_cmnd *scmnd; 114 struct srp_iu *cmd; 115 struct ib_pool_fmr **fmr_list; 116 u64 *map_page; 117 struct srp_direct_buf *indirect_desc; 118 dma_addr_t indirect_dma_addr; 119 short nfmr; 120 short index; 121 }; 122 123 struct srp_target_port { 124 /* These are RW in the hot path, and commonly used together */ 125 struct list_head free_tx; 126 struct list_head free_reqs; 127 spinlock_t lock; 128 s32 req_lim; 129 130 /* These are read-only in the hot path */ 131 struct ib_cq *send_cq ____cacheline_aligned_in_smp; 132 struct ib_cq *recv_cq; 133 struct ib_qp *qp; 134 u32 lkey; 135 u32 rkey; 136 enum srp_target_state state; 137 unsigned int max_iu_len; 138 unsigned int cmd_sg_cnt; 139 unsigned int indirect_size; 140 bool allow_ext_sg; 141 142 /* Everything above this point is used in the hot path of 143 * command processing. Try to keep them packed into cachelines. 144 */ 145 146 __be64 id_ext; 147 __be64 ioc_guid; 148 __be64 service_id; 149 __be64 initiator_ext; 150 u16 io_class; 151 struct srp_host *srp_host; 152 struct Scsi_Host *scsi_host; 153 struct srp_rport *rport; 154 char target_name[32]; 155 unsigned int scsi_id; 156 unsigned int sg_tablesize; 157 int queue_size; 158 int req_ring_size; 159 int comp_vector; 160 int tl_retry_count; 161 162 struct ib_sa_path_rec path; 163 __be16 orig_dgid[8]; 164 struct ib_sa_query *path_query; 165 int path_query_id; 166 167 u32 rq_tmo_jiffies; 168 bool connected; 169 170 struct ib_cm_id *cm_id; 171 172 int max_ti_iu_len; 173 174 int zero_req_lim; 175 176 struct srp_iu **tx_ring; 177 struct srp_iu **rx_ring; 178 struct srp_request *req_ring; 179 180 struct work_struct tl_err_work; 181 struct work_struct remove_work; 182 183 struct list_head list; 184 struct completion done; 185 int status; 186 bool qp_in_error; 187 188 struct completion tsk_mgmt_done; 189 u8 tsk_mgmt_status; 190 }; 191 192 struct srp_iu { 193 struct list_head list; 194 u64 dma; 195 void *buf; 196 size_t size; 197 enum dma_data_direction direction; 198 }; 199 200 struct srp_map_state { 201 struct ib_pool_fmr **next_fmr; 202 struct srp_direct_buf *desc; 203 u64 *pages; 204 dma_addr_t base_dma_addr; 205 u32 fmr_len; 206 u32 total_len; 207 unsigned int npages; 208 unsigned int nfmr; 209 unsigned int ndesc; 210 struct scatterlist *unmapped_sg; 211 int unmapped_index; 212 dma_addr_t unmapped_addr; 213 }; 214 215 #endif /* IB_SRP_H */ 216