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 50 enum { 51 SRP_PATH_REC_TIMEOUT_MS = 1000, 52 SRP_ABORT_TIMEOUT_MS = 5000, 53 54 SRP_PORT_REDIRECT = 1, 55 SRP_DLID_REDIRECT = 2, 56 57 SRP_MAX_LUN = 512, 58 SRP_MAX_IU_LEN = 256, 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 68 #define SRP_OP_RECV (1 << 31) 69 #define SRP_MAX_INDIRECT ((SRP_MAX_IU_LEN - \ 70 sizeof (struct srp_cmd) - \ 71 sizeof (struct srp_indirect_buf)) / 16) 72 73 enum srp_target_state { 74 SRP_TARGET_LIVE, 75 SRP_TARGET_CONNECTING, 76 SRP_TARGET_DEAD, 77 SRP_TARGET_REMOVED 78 }; 79 80 struct srp_host { 81 u8 initiator_port_id[16]; 82 struct ib_device *dev; 83 u8 port; 84 struct ib_pd *pd; 85 struct ib_mr *mr; 86 struct class_device class_dev; 87 struct list_head target_list; 88 struct mutex target_mutex; 89 struct completion released; 90 struct list_head list; 91 }; 92 93 struct srp_request { 94 struct list_head list; 95 struct scsi_cmnd *scmnd; 96 struct srp_iu *cmd; 97 struct srp_iu *tsk_mgmt; 98 /* 99 * Fake scatterlist used when scmnd->use_sg==0. Can be killed 100 * when the SCSI midlayer no longer generates non-SG commands. 101 */ 102 struct scatterlist fake_sg; 103 struct completion done; 104 short next; 105 u8 cmd_done; 106 u8 tsk_status; 107 }; 108 109 struct srp_target_port { 110 __be64 id_ext; 111 __be64 ioc_guid; 112 __be64 service_id; 113 struct srp_host *srp_host; 114 struct Scsi_Host *scsi_host; 115 char target_name[32]; 116 unsigned int scsi_id; 117 118 struct ib_sa_path_rec path; 119 struct ib_sa_query *path_query; 120 int path_query_id; 121 122 struct ib_cm_id *cm_id; 123 struct ib_cq *cq; 124 struct ib_qp *qp; 125 126 int max_ti_iu_len; 127 s32 req_lim; 128 129 unsigned rx_head; 130 struct srp_iu *rx_ring[SRP_RQ_SIZE]; 131 132 unsigned tx_head; 133 unsigned tx_tail; 134 struct srp_iu *tx_ring[SRP_SQ_SIZE + 1]; 135 136 int req_head; 137 struct list_head req_queue; 138 struct srp_request req_ring[SRP_SQ_SIZE]; 139 140 struct work_struct work; 141 142 struct list_head list; 143 struct completion done; 144 int status; 145 enum srp_target_state state; 146 }; 147 148 struct srp_iu { 149 dma_addr_t dma; 150 void *buf; 151 size_t size; 152 enum dma_data_direction direction; 153 }; 154 155 #endif /* IB_SRP_H */ 156