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 41 #include <asm/semaphore.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_IU_LEN = 256, 58 59 SRP_RQ_SHIFT = 6, 60 SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT, 61 SRP_SQ_SIZE = SRP_RQ_SIZE - 1, 62 SRP_CQ_SIZE = SRP_SQ_SIZE + SRP_RQ_SIZE, 63 64 SRP_TAG_TSK_MGMT = 1 << (SRP_RQ_SHIFT + 1) 65 }; 66 67 #define SRP_OP_RECV (1 << 31) 68 #define SRP_MAX_INDIRECT ((SRP_MAX_IU_LEN - \ 69 sizeof (struct srp_cmd) - \ 70 sizeof (struct srp_indirect_buf)) / 16) 71 72 enum srp_target_state { 73 SRP_TARGET_LIVE, 74 SRP_TARGET_CONNECTING, 75 SRP_TARGET_DEAD, 76 SRP_TARGET_REMOVED 77 }; 78 79 struct srp_host { 80 u8 initiator_port_id[16]; 81 struct ib_device *dev; 82 u8 port; 83 struct ib_pd *pd; 84 struct ib_mr *mr; 85 struct class_device class_dev; 86 struct list_head target_list; 87 struct semaphore target_mutex; 88 struct completion released; 89 struct list_head list; 90 }; 91 92 struct srp_request { 93 struct list_head list; 94 struct scsi_cmnd *scmnd; 95 struct srp_iu *cmd; 96 struct srp_iu *tsk_mgmt; 97 DECLARE_PCI_UNMAP_ADDR(direct_mapping) 98 struct completion done; 99 short next; 100 u8 cmd_done; 101 u8 tsk_status; 102 }; 103 104 struct srp_target_port { 105 __be64 id_ext; 106 __be64 ioc_guid; 107 __be64 service_id; 108 struct srp_host *srp_host; 109 struct Scsi_Host *scsi_host; 110 char target_name[32]; 111 unsigned int scsi_id; 112 113 struct ib_sa_path_rec path; 114 struct ib_sa_query *path_query; 115 int path_query_id; 116 117 struct ib_cm_id *cm_id; 118 struct ib_cq *cq; 119 struct ib_qp *qp; 120 121 int max_ti_iu_len; 122 s32 req_lim; 123 124 unsigned rx_head; 125 struct srp_iu *rx_ring[SRP_RQ_SIZE]; 126 127 unsigned tx_head; 128 unsigned tx_tail; 129 struct srp_iu *tx_ring[SRP_SQ_SIZE + 1]; 130 131 int req_head; 132 struct list_head req_queue; 133 struct srp_request req_ring[SRP_SQ_SIZE]; 134 135 struct work_struct work; 136 137 struct list_head list; 138 struct completion done; 139 int status; 140 enum srp_target_state state; 141 }; 142 143 struct srp_iu { 144 dma_addr_t dma; 145 void *buf; 146 size_t size; 147 enum dma_data_direction direction; 148 }; 149 150 #endif /* IB_SRP_H */ 151