2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
36 #include <linux/types.h>
37 #include <linux/list.h>
38 #include <linux/mutex.h>
39 #include <linux/scatterlist.h>
41 #include <scsi/scsi_host.h>
42 #include <scsi/scsi_cmnd.h>
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>
50 SRP_PATH_REC_TIMEOUT_MS = 1000,
51 SRP_ABORT_TIMEOUT_MS = 5000,
53 SRP_PORT_REDIRECT = 1,
54 SRP_DLID_REDIRECT = 2,
58 SRP_DEF_SG_TABLESIZE = 12,
61 SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT,
63 SRP_SQ_SIZE = SRP_RQ_SIZE,
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,
70 SRP_TAG_TSK_MGMT = 1U << 31,
73 SRP_FMR_MIN_SIZE = 128,
74 SRP_FMR_POOL_SIZE = 1024,
75 SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4,
77 SRP_MAP_ALLOW_FMR = 0,
81 enum srp_target_state {
94 struct list_head dev_list;
95 struct ib_device *dev;
98 struct ib_fmr_pool *fmr_pool;
105 struct srp_device *srp_dev;
108 struct list_head target_list;
109 spinlock_t target_lock;
110 struct completion released;
111 struct list_head list;
115 struct list_head list;
116 struct scsi_cmnd *scmnd;
118 struct ib_pool_fmr **fmr_list;
120 struct srp_direct_buf *indirect_desc;
121 dma_addr_t indirect_dma_addr;
126 struct srp_target_port {
127 /* These are RW in the hot path, and commonly used together */
128 struct list_head free_tx;
129 struct list_head free_reqs;
133 /* These are read-only in the hot path */
134 struct ib_cq *send_cq ____cacheline_aligned_in_smp;
135 struct ib_cq *recv_cq;
139 enum srp_target_state state;
140 unsigned int max_iu_len;
141 unsigned int cmd_sg_cnt;
142 unsigned int indirect_size;
145 /* Everything above this point is used in the hot path of
146 * command processing. Try to keep them packed into cachelines.
152 __be64 initiator_ext;
154 struct srp_host *srp_host;
155 struct Scsi_Host *scsi_host;
156 char target_name[32];
157 unsigned int scsi_id;
158 unsigned int sg_tablesize;
160 struct ib_sa_path_rec path;
162 struct ib_sa_query *path_query;
167 struct ib_cm_id *cm_id;
173 struct srp_iu *tx_ring[SRP_SQ_SIZE];
174 struct srp_iu *rx_ring[SRP_RQ_SIZE];
175 struct srp_request req_ring[SRP_CMD_SQ_SIZE];
177 struct work_struct work;
179 struct list_head list;
180 struct completion done;
184 struct completion tsk_mgmt_done;
189 struct list_head list;
193 enum dma_data_direction direction;
196 struct srp_map_state {
197 struct ib_pool_fmr **next_fmr;
198 struct srp_direct_buf *desc;
200 dma_addr_t base_dma_addr;
206 struct scatterlist *unmapped_sg;
208 dma_addr_t unmapped_addr;
211 #endif /* IB_SRP_H */