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/rdma_cm.h>
50 SRP_PATH_REC_TIMEOUT_MS = 1000,
51 SRP_ABORT_TIMEOUT_MS = 5000,
53 SRP_PORT_REDIRECT = 1,
54 SRP_DLID_REDIRECT = 2,
57 SRP_DEF_SG_TABLESIZE = 12,
59 SRP_DEFAULT_QUEUE_SIZE = 1 << 6,
61 SRP_TSK_MGMT_SQ_SIZE = 1,
62 SRP_DEFAULT_CMD_SQ_SIZE = SRP_DEFAULT_QUEUE_SIZE - SRP_RSP_SQ_SIZE -
66 SRP_TAG_TSK_MGMT = 1U << 31,
68 SRP_MAX_PAGES_PER_MR = 512,
70 SRP_MAX_ADD_CDB_LEN = 16,
73 SRP_MAX_SGE = SRP_MAX_IMM_SGE + 1,
75 * Choose the immediate data offset such that a 32 byte CDB still fits.
77 SRP_IMM_DATA_OFFSET = sizeof(struct srp_cmd) +
79 sizeof(struct srp_imm_buf),
82 enum srp_target_state {
95 * @mr_page_mask: HCA memory registration page mask.
96 * @mr_page_size: HCA memory registration page size.
97 * @mr_max_size: Maximum size in bytes of a single FR registration request.
100 struct list_head dev_list;
101 struct ib_device *dev;
107 int max_pages_per_mr;
113 struct srp_device *srp_dev;
116 struct list_head target_list;
117 spinlock_t target_lock;
118 struct completion released;
119 struct list_head list;
120 struct mutex add_target_mutex;
124 struct scsi_cmnd *scmnd;
126 struct srp_fr_desc **fr_list;
127 struct srp_direct_buf *indirect_desc;
128 dma_addr_t indirect_dma_addr;
130 struct ib_cqe reg_cqe;
135 * @comp_vector: Completion vector used by this RDMA channel.
136 * @max_it_iu_len: Maximum initiator-to-target information unit length.
137 * @max_ti_iu_len: Maximum target-to-initiator information unit length.
140 /* These are RW in the hot path, and commonly used together */
141 struct list_head free_tx;
145 /* These are read-only in the hot path */
146 struct srp_target_port *target ____cacheline_aligned_in_smp;
147 struct ib_cq *send_cq;
148 struct ib_cq *recv_cq;
150 struct srp_fr_pool *fr_pool;
151 uint32_t max_it_iu_len;
152 uint32_t max_ti_iu_len;
156 /* Everything above this point is used in the hot path of
157 * command processing. Try to keep them packed into cachelines.
160 struct completion done;
165 struct sa_path_rec path;
166 struct ib_sa_query *path_query;
168 struct ib_cm_id *cm_id;
171 struct rdma_cm_id *cm_id;
175 struct srp_iu **tx_ring;
176 struct srp_iu **rx_ring;
177 struct srp_request *req_ring;
181 struct completion tsk_mgmt_done;
187 * struct srp_target_port
188 * @comp_vector: Completion vector used by the first RDMA channel created for
191 struct srp_target_port {
192 /* read and written in the hot path */
195 /* read only in the hot path */
197 struct srp_rdma_ch *ch;
201 enum srp_target_state state;
202 uint32_t max_it_iu_size;
203 unsigned int cmd_sg_cnt;
204 unsigned int indirect_size;
207 /* other member variables */
211 __be64 initiator_ext;
213 struct srp_host *srp_host;
214 struct Scsi_Host *scsi_host;
215 struct srp_rport *rport;
216 char target_name[32];
217 unsigned int scsi_id;
218 unsigned int sg_tablesize;
219 unsigned int target_can_queue;
232 union ib_gid orig_dgid;
237 struct sockaddr_in ip4;
238 struct sockaddr_in6 ip6;
240 struct sockaddr_storage ss;
243 struct sockaddr_in ip4;
244 struct sockaddr_in6 ip6;
246 struct sockaddr_storage ss;
256 struct work_struct tl_err_work;
257 struct work_struct remove_work;
259 struct list_head list;
264 struct list_head list;
268 enum dma_data_direction direction;
270 struct ib_sge sge[SRP_MAX_SGE];
275 * struct srp_fr_desc - fast registration work request arguments
276 * @entry: Entry in srp_fr_pool.free_list.
277 * @mr: Memory region.
278 * @frpl: Fast registration page list.
281 struct list_head entry;
286 * struct srp_fr_pool - pool of fast registration descriptors
288 * An entry is available for allocation if and only if it occurs in @free_list.
290 * @size: Number of descriptors in this pool.
291 * @max_page_list_len: Maximum fast registration work request page list length.
292 * @lock: Protects free_list.
293 * @free_list: List of free descriptors.
294 * @desc: Fast registration descriptor pool.
298 int max_page_list_len;
300 struct list_head free_list;
301 struct srp_fr_desc desc[];
305 * struct srp_map_state - per-request DMA memory mapping state
306 * @desc: Pointer to the element of the SRP buffer descriptor array
307 * that is being filled in.
308 * @pages: Array with DMA addresses of pages being considered for
309 * memory registration.
310 * @base_dma_addr: DMA address of the first page that has not yet been mapped.
311 * @dma_len: Number of bytes that will be registered with the next FR
312 * memory registration call.
313 * @total_len: Total number of bytes in the sg-list being mapped.
314 * @npages: Number of page addresses in the pages[] array.
315 * @nmdesc: Number of FR memory descriptors used for mapping.
316 * @ndesc: Number of SRP buffer descriptors that have been filled in.
318 struct srp_map_state {
321 struct srp_fr_desc **next;
322 struct srp_fr_desc **end;
329 struct srp_direct_buf *desc;
332 struct scatterlist *sg;
334 dma_addr_t base_dma_addr;
342 #endif /* IB_SRP_H */