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_RQ_SHIFT = 6, 61 SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT, 62 63 SRP_SQ_SIZE = SRP_RQ_SIZE, 64 SRP_RSP_SQ_SIZE = 1, 65 SRP_REQ_SQ_SIZE = SRP_SQ_SIZE - SRP_RSP_SQ_SIZE, 66 SRP_TSK_MGMT_SQ_SIZE = 1, 67 SRP_CMD_SQ_SIZE = SRP_REQ_SQ_SIZE - SRP_TSK_MGMT_SQ_SIZE, 68 69 SRP_TAG_NO_REQ = ~0U, 70 SRP_TAG_TSK_MGMT = 1U << 31, 71 72 SRP_FMR_SIZE = 512, 73 SRP_FMR_MIN_SIZE = 128, 74 SRP_FMR_POOL_SIZE = 1024, 75 SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4, 76 77 SRP_MAP_ALLOW_FMR = 0, 78 SRP_MAP_NO_FMR = 1, 79 }; 80 81 enum srp_target_state { 82 SRP_TARGET_LIVE, 83 SRP_TARGET_CONNECTING, 84 SRP_TARGET_DEAD, 85 SRP_TARGET_REMOVED 86 }; 87 88 enum srp_iu_type { 89 SRP_IU_CMD, 90 SRP_IU_TSK_MGMT, 91 SRP_IU_RSP, 92 }; 93 94 struct srp_device { 95 struct list_head dev_list; 96 struct ib_device *dev; 97 struct ib_pd *pd; 98 struct ib_mr *mr; 99 struct ib_fmr_pool *fmr_pool; 100 u64 fmr_page_mask; 101 int fmr_page_size; 102 int fmr_max_size; 103 }; 104 105 struct srp_host { 106 struct srp_device *srp_dev; 107 u8 port; 108 struct device dev; 109 struct list_head target_list; 110 spinlock_t target_lock; 111 struct completion released; 112 struct list_head list; 113 }; 114 115 struct srp_request { 116 struct list_head list; 117 struct scsi_cmnd *scmnd; 118 struct srp_iu *cmd; 119 struct ib_pool_fmr **fmr_list; 120 u64 *map_page; 121 struct srp_direct_buf *indirect_desc; 122 dma_addr_t indirect_dma_addr; 123 short nfmr; 124 short index; 125 }; 126 127 struct srp_target_port { 128 /* These are RW in the hot path, and commonly used together */ 129 struct list_head free_tx; 130 struct list_head free_reqs; 131 spinlock_t lock; 132 s32 req_lim; 133 134 /* These are read-only in the hot path */ 135 struct ib_cq *send_cq ____cacheline_aligned_in_smp; 136 struct ib_cq *recv_cq; 137 struct ib_qp *qp; 138 u32 lkey; 139 u32 rkey; 140 enum srp_target_state state; 141 unsigned int max_iu_len; 142 unsigned int cmd_sg_cnt; 143 unsigned int indirect_size; 144 bool allow_ext_sg; 145 146 /* Everything above this point is used in the hot path of 147 * command processing. Try to keep them packed into cachelines. 148 */ 149 150 __be64 id_ext; 151 __be64 ioc_guid; 152 __be64 service_id; 153 __be64 initiator_ext; 154 u16 io_class; 155 struct srp_host *srp_host; 156 struct Scsi_Host *scsi_host; 157 char target_name[32]; 158 unsigned int scsi_id; 159 unsigned int sg_tablesize; 160 161 struct ib_sa_path_rec path; 162 __be16 orig_dgid[8]; 163 struct ib_sa_query *path_query; 164 int path_query_id; 165 166 struct ib_cm_id *cm_id; 167 168 int max_ti_iu_len; 169 170 int zero_req_lim; 171 172 struct srp_iu *tx_ring[SRP_SQ_SIZE]; 173 struct srp_iu *rx_ring[SRP_RQ_SIZE]; 174 struct srp_request req_ring[SRP_CMD_SQ_SIZE]; 175 176 struct work_struct work; 177 178 struct list_head list; 179 struct completion done; 180 int status; 181 int qp_in_error; 182 183 struct completion tsk_mgmt_done; 184 u8 tsk_mgmt_status; 185 }; 186 187 struct srp_iu { 188 struct list_head list; 189 u64 dma; 190 void *buf; 191 size_t size; 192 enum dma_data_direction direction; 193 }; 194 195 struct srp_map_state { 196 struct ib_pool_fmr **next_fmr; 197 struct srp_direct_buf *desc; 198 u64 *pages; 199 dma_addr_t base_dma_addr; 200 u32 fmr_len; 201 u32 total_len; 202 unsigned int npages; 203 unsigned int nfmr; 204 unsigned int ndesc; 205 struct scatterlist *unmapped_sg; 206 int unmapped_index; 207 dma_addr_t unmapped_addr; 208 }; 209 210 #endif /* IB_SRP_H */ 211