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 * $Id: ib_srp.h 3932 2005-11-01 17:19:29Z roland $ 33 */ 34 35 #ifndef IB_SRP_H 36 #define IB_SRP_H 37 38 #include <linux/types.h> 39 #include <linux/list.h> 40 #include <linux/mutex.h> 41 #include <linux/scatterlist.h> 42 43 #include <scsi/scsi_host.h> 44 #include <scsi/scsi_cmnd.h> 45 46 #include <rdma/ib_verbs.h> 47 #include <rdma/ib_sa.h> 48 #include <rdma/ib_cm.h> 49 #include <rdma/ib_fmr_pool.h> 50 51 enum { 52 SRP_PATH_REC_TIMEOUT_MS = 1000, 53 SRP_ABORT_TIMEOUT_MS = 5000, 54 55 SRP_PORT_REDIRECT = 1, 56 SRP_DLID_REDIRECT = 2, 57 58 SRP_MAX_LUN = 512, 59 SRP_DEF_SG_TABLESIZE = 12, 60 61 SRP_RQ_SHIFT = 6, 62 SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT, 63 SRP_SQ_SIZE = SRP_RQ_SIZE - 1, 64 SRP_CQ_SIZE = SRP_SQ_SIZE + SRP_RQ_SIZE, 65 66 SRP_TAG_TSK_MGMT = 1 << (SRP_RQ_SHIFT + 1), 67 68 SRP_FMR_SIZE = 256, 69 SRP_FMR_POOL_SIZE = 1024, 70 SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4 71 }; 72 73 #define SRP_OP_RECV (1 << 31) 74 75 enum srp_target_state { 76 SRP_TARGET_LIVE, 77 SRP_TARGET_CONNECTING, 78 SRP_TARGET_DEAD, 79 SRP_TARGET_REMOVED 80 }; 81 82 enum srp_request_type { 83 SRP_REQ_NORMAL, 84 SRP_REQ_TASK_MGMT, 85 }; 86 87 struct srp_device { 88 struct list_head dev_list; 89 struct ib_device *dev; 90 struct ib_pd *pd; 91 struct ib_mr *mr; 92 struct ib_fmr_pool *fmr_pool; 93 int fmr_page_shift; 94 int fmr_page_size; 95 u64 fmr_page_mask; 96 }; 97 98 struct srp_host { 99 struct srp_device *dev; 100 u8 port; 101 struct class_device class_dev; 102 struct list_head target_list; 103 spinlock_t target_lock; 104 struct completion released; 105 struct list_head list; 106 }; 107 108 struct srp_request { 109 struct list_head list; 110 struct scsi_cmnd *scmnd; 111 struct srp_iu *cmd; 112 struct srp_iu *tsk_mgmt; 113 struct ib_pool_fmr *fmr; 114 struct completion done; 115 short index; 116 u8 cmd_done; 117 u8 tsk_status; 118 }; 119 120 struct srp_target_port { 121 __be64 id_ext; 122 __be64 ioc_guid; 123 __be64 service_id; 124 __be64 initiator_ext; 125 u16 io_class; 126 struct srp_host *srp_host; 127 struct Scsi_Host *scsi_host; 128 char target_name[32]; 129 unsigned int scsi_id; 130 131 struct ib_sa_path_rec path; 132 __be16 orig_dgid[8]; 133 struct ib_sa_query *path_query; 134 int path_query_id; 135 136 struct ib_cm_id *cm_id; 137 struct ib_cq *cq; 138 struct ib_qp *qp; 139 140 int max_ti_iu_len; 141 s32 req_lim; 142 143 int zero_req_lim; 144 145 unsigned rx_head; 146 struct srp_iu *rx_ring[SRP_RQ_SIZE]; 147 148 unsigned tx_head; 149 unsigned tx_tail; 150 struct srp_iu *tx_ring[SRP_SQ_SIZE + 1]; 151 152 struct list_head free_reqs; 153 struct list_head req_queue; 154 struct srp_request req_ring[SRP_SQ_SIZE]; 155 156 struct work_struct work; 157 158 struct list_head list; 159 struct completion done; 160 int status; 161 enum srp_target_state state; 162 int qp_in_error; 163 }; 164 165 struct srp_iu { 166 u64 dma; 167 void *buf; 168 size_t size; 169 enum dma_data_direction direction; 170 }; 171 172 #endif /* IB_SRP_H */ 173