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 SRP_SQ_SIZE = SRP_RQ_SIZE - 1, 63 SRP_CQ_SIZE = SRP_SQ_SIZE + SRP_RQ_SIZE, 64 65 SRP_TAG_TSK_MGMT = 1 << (SRP_RQ_SHIFT + 1), 66 67 SRP_FMR_SIZE = 256, 68 SRP_FMR_POOL_SIZE = 1024, 69 SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4 70 }; 71 72 #define SRP_OP_RECV (1 << 31) 73 74 enum srp_target_state { 75 SRP_TARGET_LIVE, 76 SRP_TARGET_CONNECTING, 77 SRP_TARGET_DEAD, 78 SRP_TARGET_REMOVED 79 }; 80 81 enum srp_request_type { 82 SRP_REQ_NORMAL, 83 SRP_REQ_TASK_MGMT, 84 }; 85 86 struct srp_device { 87 struct list_head dev_list; 88 struct ib_device *dev; 89 struct ib_pd *pd; 90 struct ib_mr *mr; 91 struct ib_fmr_pool *fmr_pool; 92 int fmr_page_shift; 93 int fmr_page_size; 94 u64 fmr_page_mask; 95 }; 96 97 struct srp_host { 98 struct srp_device *srp_dev; 99 u8 port; 100 struct device dev; 101 struct list_head target_list; 102 spinlock_t target_lock; 103 struct completion released; 104 struct list_head list; 105 }; 106 107 struct srp_request { 108 struct list_head list; 109 struct scsi_cmnd *scmnd; 110 struct srp_iu *cmd; 111 struct srp_iu *tsk_mgmt; 112 struct ib_pool_fmr *fmr; 113 struct completion done; 114 short index; 115 u8 cmd_done; 116 u8 tsk_status; 117 }; 118 119 struct srp_target_port { 120 __be64 id_ext; 121 __be64 ioc_guid; 122 __be64 service_id; 123 __be64 initiator_ext; 124 u16 io_class; 125 struct srp_host *srp_host; 126 struct Scsi_Host *scsi_host; 127 char target_name[32]; 128 unsigned int scsi_id; 129 130 struct ib_sa_path_rec path; 131 __be16 orig_dgid[8]; 132 struct ib_sa_query *path_query; 133 int path_query_id; 134 135 struct ib_cm_id *cm_id; 136 struct ib_cq *cq; 137 struct ib_qp *qp; 138 139 int max_ti_iu_len; 140 s32 req_lim; 141 142 int zero_req_lim; 143 144 unsigned rx_head; 145 struct srp_iu *rx_ring[SRP_RQ_SIZE]; 146 147 unsigned tx_head; 148 unsigned tx_tail; 149 struct srp_iu *tx_ring[SRP_SQ_SIZE + 1]; 150 151 struct list_head free_reqs; 152 struct list_head req_queue; 153 struct srp_request req_ring[SRP_SQ_SIZE]; 154 155 struct work_struct work; 156 157 struct list_head list; 158 struct completion done; 159 int status; 160 enum srp_target_state state; 161 int qp_in_error; 162 }; 163 164 struct srp_iu { 165 u64 dma; 166 void *buf; 167 size_t size; 168 enum dma_data_direction direction; 169 }; 170 171 #endif /* IB_SRP_H */ 172