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 = 256, 73 SRP_FMR_POOL_SIZE = 1024, 74 SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4 75 }; 76 77 enum srp_target_state { 78 SRP_TARGET_LIVE, 79 SRP_TARGET_CONNECTING, 80 SRP_TARGET_DEAD, 81 SRP_TARGET_REMOVED 82 }; 83 84 enum srp_iu_type { 85 SRP_IU_CMD, 86 SRP_IU_TSK_MGMT, 87 SRP_IU_RSP, 88 }; 89 90 struct srp_device { 91 struct list_head dev_list; 92 struct ib_device *dev; 93 struct ib_pd *pd; 94 struct ib_mr *mr; 95 struct ib_fmr_pool *fmr_pool; 96 int fmr_page_shift; 97 int fmr_page_size; 98 u64 fmr_page_mask; 99 }; 100 101 struct srp_host { 102 struct srp_device *srp_dev; 103 u8 port; 104 struct device dev; 105 struct list_head target_list; 106 spinlock_t target_lock; 107 struct completion released; 108 struct list_head list; 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; 116 short index; 117 }; 118 119 struct srp_target_port { 120 /* These are RW in the hot path, and commonly used together */ 121 struct list_head free_tx; 122 struct list_head free_reqs; 123 spinlock_t lock; 124 s32 req_lim; 125 126 /* These are read-only in the hot path */ 127 struct ib_cq *send_cq ____cacheline_aligned_in_smp; 128 struct ib_cq *recv_cq; 129 struct ib_qp *qp; 130 u32 lkey; 131 u32 rkey; 132 enum srp_target_state state; 133 134 /* Everything above this point is used in the hot path of 135 * command processing. Try to keep them packed into cachelines. 136 */ 137 138 __be64 id_ext; 139 __be64 ioc_guid; 140 __be64 service_id; 141 __be64 initiator_ext; 142 u16 io_class; 143 struct srp_host *srp_host; 144 struct Scsi_Host *scsi_host; 145 char target_name[32]; 146 unsigned int scsi_id; 147 148 struct ib_sa_path_rec path; 149 __be16 orig_dgid[8]; 150 struct ib_sa_query *path_query; 151 int path_query_id; 152 153 struct ib_cm_id *cm_id; 154 155 int max_ti_iu_len; 156 157 int zero_req_lim; 158 159 struct srp_iu *tx_ring[SRP_SQ_SIZE]; 160 struct srp_iu *rx_ring[SRP_RQ_SIZE]; 161 struct srp_request req_ring[SRP_CMD_SQ_SIZE]; 162 163 struct work_struct work; 164 165 struct list_head list; 166 struct completion done; 167 int status; 168 int qp_in_error; 169 170 struct completion tsk_mgmt_done; 171 u8 tsk_mgmt_status; 172 }; 173 174 struct srp_iu { 175 struct list_head list; 176 u64 dma; 177 void *buf; 178 size_t size; 179 enum dma_data_direction direction; 180 }; 181 182 #endif /* IB_SRP_H */ 183