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49cd5382 OG |
1 | /* |
2 | * iSER transport for the Open iSCSI Initiator & iSER transport internals | |
3 | * | |
4 | * Copyright (C) 2004 Dmitry Yusupov | |
5 | * Copyright (C) 2004 Alex Aizman | |
6 | * Copyright (C) 2005 Mike Christie | |
7 | * based on code maintained by open-iscsi@googlegroups.com | |
8 | * | |
9 | * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. | |
10 | * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. | |
3ee07d27 | 11 | * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. |
49cd5382 OG |
12 | * |
13 | * This software is available to you under a choice of one of two | |
14 | * licenses. You may choose to be licensed under the terms of the GNU | |
15 | * General Public License (GPL) Version 2, available from the file | |
16 | * COPYING in the main directory of this source tree, or the | |
17 | * OpenIB.org BSD license below: | |
18 | * | |
19 | * Redistribution and use in source and binary forms, with or | |
20 | * without modification, are permitted provided that the following | |
21 | * conditions are met: | |
22 | * | |
23 | * - Redistributions of source code must retain the above | |
24 | * copyright notice, this list of conditions and the following | |
25 | * disclaimer. | |
26 | * | |
27 | * - Redistributions in binary form must reproduce the above | |
28 | * copyright notice, this list of conditions and the following | |
29 | * disclaimer in the documentation and/or other materials | |
30 | * provided with the distribution. | |
31 | * | |
32 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
33 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
34 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
35 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
36 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
37 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
38 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
39 | * SOFTWARE. | |
49cd5382 OG |
40 | */ |
41 | #ifndef __ISCSI_ISER_H__ | |
42 | #define __ISCSI_ISER_H__ | |
43 | ||
44 | #include <linux/types.h> | |
45 | #include <linux/net.h> | |
4f363882 | 46 | #include <linux/printk.h> |
49cd5382 OG |
47 | #include <scsi/libiscsi.h> |
48 | #include <scsi/scsi_transport_iscsi.h> | |
177e31bd SG |
49 | #include <scsi/scsi_cmnd.h> |
50 | #include <scsi/scsi_device.h> | |
49cd5382 | 51 | |
a6b7a407 | 52 | #include <linux/interrupt.h> |
49cd5382 OG |
53 | #include <linux/wait.h> |
54 | #include <linux/sched.h> | |
55 | #include <linux/list.h> | |
56 | #include <linux/slab.h> | |
57 | #include <linux/dma-mapping.h> | |
58 | #include <linux/mutex.h> | |
59 | #include <linux/mempool.h> | |
60 | #include <linux/uio.h> | |
61 | ||
62 | #include <linux/socket.h> | |
63 | #include <linux/in.h> | |
64 | #include <linux/in6.h> | |
65 | ||
66 | #include <rdma/ib_verbs.h> | |
67 | #include <rdma/ib_fmr_pool.h> | |
68 | #include <rdma/rdma_cm.h> | |
69 | ||
70 | #define DRV_NAME "iser" | |
71 | #define PFX DRV_NAME ": " | |
4fcd1470 | 72 | #define DRV_VER "1.6" |
49cd5382 | 73 | |
e9d49b82 SG |
74 | #define iser_dbg(fmt, arg...) \ |
75 | do { \ | |
60e20908 | 76 | if (unlikely(iser_debug_level > 2)) \ |
e9d49b82 SG |
77 | printk(KERN_DEBUG PFX "%s: " fmt,\ |
78 | __func__ , ## arg); \ | |
6f735e36 ED |
79 | } while (0) |
80 | ||
81 | #define iser_warn(fmt, arg...) \ | |
4f363882 | 82 | do { \ |
60e20908 | 83 | if (unlikely(iser_debug_level > 0)) \ |
e9d49b82 | 84 | pr_warn(PFX "%s: " fmt, \ |
4f363882 RD |
85 | __func__ , ## arg); \ |
86 | } while (0) | |
87 | ||
88 | #define iser_info(fmt, arg...) \ | |
49cd5382 | 89 | do { \ |
60e20908 | 90 | if (unlikely(iser_debug_level > 1)) \ |
e9d49b82 | 91 | pr_info(PFX "%s: " fmt, \ |
49cd5382 OG |
92 | __func__ , ## arg); \ |
93 | } while (0) | |
94 | ||
60e20908 SG |
95 | #define iser_err(fmt, arg...) \ |
96 | pr_err(PFX "%s: " fmt, __func__ , ## arg) | |
49cd5382 | 97 | |
8dfa0876 | 98 | #define SHIFT_4K 12 |
0ace64b8 | 99 | #define SIZE_4K (1ULL << SHIFT_4K) |
8dfa0876 | 100 | #define MASK_4K (~(SIZE_4K-1)) |
df749cdc SG |
101 | |
102 | /* Default support is 512KB I/O size */ | |
103 | #define ISER_DEF_MAX_SECTORS 1024 | |
104 | #define ISCSI_ISER_DEF_SG_TABLESIZE ((ISER_DEF_MAX_SECTORS * 512) >> SHIFT_4K) | |
105 | /* Maximum support is 8MB I/O size */ | |
106 | #define ISCSI_ISER_MAX_SG_TABLESIZE ((16384 * 512) >> SHIFT_4K) | |
107 | ||
b7f04513 SP |
108 | #define ISER_DEF_XMIT_CMDS_DEFAULT 512 |
109 | #if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT | |
110 | #define ISER_DEF_XMIT_CMDS_MAX ISCSI_DEF_XMIT_CMDS_MAX | |
111 | #else | |
112 | #define ISER_DEF_XMIT_CMDS_MAX ISER_DEF_XMIT_CMDS_DEFAULT | |
113 | #endif | |
114 | #define ISER_DEF_CMD_PER_LUN ISER_DEF_XMIT_CMDS_MAX | |
49cd5382 OG |
115 | |
116 | /* QP settings */ | |
117 | /* Maximal bounds on received asynchronous PDUs */ | |
118 | #define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */ | |
119 | ||
120 | #define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), * | |
121 | * SCSI_TMFUNC(2), LOGOUT(1) */ | |
122 | ||
b7f04513 | 123 | #define ISER_QP_MAX_RECV_DTOS (ISER_DEF_XMIT_CMDS_MAX) |
bcc60c38 | 124 | |
b7f04513 | 125 | #define ISER_MIN_POSTED_RX (ISER_DEF_XMIT_CMDS_MAX >> 2) |
49cd5382 OG |
126 | |
127 | /* the max TX (send) WR supported by the iSER QP is defined by * | |
128 | * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect * | |
129 | * to have at max for SCSI command. The tx posting & completion handling code * | |
130 | * supports -EAGAIN scheme where tx is suspended till the QP has room for more * | |
131 | * send WR. D=8 comes from 64K/8K */ | |
132 | ||
133 | #define ISER_INFLIGHT_DATAOUTS 8 | |
134 | ||
b7f04513 | 135 | #define ISER_QP_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \ |
49cd5382 OG |
136 | (1 + ISER_INFLIGHT_DATAOUTS) + \ |
137 | ISER_MAX_TX_MISC_PDUS + \ | |
138 | ISER_MAX_RX_MISC_PDUS) | |
139 | ||
6b5a8fb0 AT |
140 | /* Max registration work requests per command */ |
141 | #define ISER_MAX_REG_WR_PER_CMD 5 | |
142 | ||
143 | /* For Signature we don't support DATAOUTs so no need to make room for them */ | |
144 | #define ISER_QP_SIG_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \ | |
145 | (1 + ISER_MAX_REG_WR_PER_CMD) + \ | |
146 | ISER_MAX_TX_MISC_PDUS + \ | |
147 | ISER_MAX_RX_MISC_PDUS) | |
148 | ||
f4641ef7 MT |
149 | #define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr \ |
150 | - ISER_MAX_TX_MISC_PDUS \ | |
151 | - ISER_MAX_RX_MISC_PDUS) / \ | |
152 | (1 + ISER_INFLIGHT_DATAOUTS)) | |
153 | ||
6e6fe2fb | 154 | #define ISER_WC_BATCH_COUNT 16 |
6df5a128 | 155 | #define ISER_SIGNAL_CMD_COUNT 32 |
6e6fe2fb | 156 | |
49cd5382 OG |
157 | #define ISER_VER 0x10 |
158 | #define ISER_WSV 0x08 | |
159 | #define ISER_RSV 0x04 | |
160 | ||
7306b8fa | 161 | #define ISER_FASTREG_LI_WRID 0xffffffffffffffffULL |
ff3dd52d | 162 | #define ISER_BEACON_WRID 0xfffffffffffffffeULL |
db523b8d | 163 | |
cd88621a SG |
164 | /** |
165 | * struct iser_hdr - iSER header | |
166 | * | |
167 | * @flags: flags support (zbva, remote_inv) | |
168 | * @rsvd: reserved | |
169 | * @write_stag: write rkey | |
170 | * @write_va: write virtual address | |
171 | * @reaf_stag: read rkey | |
172 | * @read_va: read virtual address | |
173 | */ | |
49cd5382 OG |
174 | struct iser_hdr { |
175 | u8 flags; | |
176 | u8 rsvd[3]; | |
cd88621a | 177 | __be32 write_stag; |
49cd5382 | 178 | __be64 write_va; |
cd88621a | 179 | __be32 read_stag; |
49cd5382 OG |
180 | __be64 read_va; |
181 | } __attribute__((packed)); | |
182 | ||
8d8399de OG |
183 | |
184 | #define ISER_ZBVA_NOT_SUPPORTED 0x80 | |
185 | #define ISER_SEND_W_INV_NOT_SUPPORTED 0x40 | |
186 | ||
187 | struct iser_cm_hdr { | |
188 | u8 flags; | |
189 | u8 rsvd[3]; | |
190 | } __packed; | |
191 | ||
bcc60c38 OG |
192 | /* Constant PDU lengths calculations */ |
193 | #define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr)) | |
194 | ||
195 | #define ISER_RECV_DATA_SEG_LEN 128 | |
196 | #define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN) | |
197 | #define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN) | |
49cd5382 OG |
198 | |
199 | /* Length of an object name string */ | |
200 | #define ISER_OBJECT_NAME_SIZE 64 | |
201 | ||
5716af6e | 202 | enum iser_conn_state { |
49cd5382 OG |
203 | ISER_CONN_INIT, /* descriptor allocd, no conn */ |
204 | ISER_CONN_PENDING, /* in the process of being established */ | |
205 | ISER_CONN_UP, /* up and running */ | |
206 | ISER_CONN_TERMINATING, /* in the process of being terminated */ | |
207 | ISER_CONN_DOWN, /* shut down */ | |
208 | ISER_CONN_STATES_NUM | |
209 | }; | |
210 | ||
211 | enum iser_task_status { | |
212 | ISER_TASK_STATUS_INIT = 0, | |
213 | ISER_TASK_STATUS_STARTED, | |
214 | ISER_TASK_STATUS_COMPLETED | |
215 | }; | |
216 | ||
217 | enum iser_data_dir { | |
218 | ISER_DIR_IN = 0, /* to initiator */ | |
219 | ISER_DIR_OUT, /* from initiator */ | |
220 | ISER_DIRS_NUM | |
221 | }; | |
222 | ||
cd88621a SG |
223 | /** |
224 | * struct iser_data_buf - iSER data buffer | |
225 | * | |
e3784bd1 | 226 | * @sg: pointer to the sg list |
cd88621a SG |
227 | * @size: num entries of this sg |
228 | * @data_len: total beffer byte len | |
229 | * @dma_nents: returned by dma_map_sg | |
cd88621a | 230 | */ |
49cd5382 | 231 | struct iser_data_buf { |
e3784bd1 | 232 | struct scatterlist *sg; |
39405885 | 233 | int size; |
cd88621a SG |
234 | unsigned long data_len; |
235 | unsigned int dma_nents; | |
dd0107a0 | 236 | }; |
49cd5382 OG |
237 | |
238 | /* fwd declarations */ | |
239 | struct iser_device; | |
2261ec3d | 240 | struct iscsi_iser_task; |
412eeafa | 241 | struct iscsi_endpoint; |
32467c42 | 242 | struct iser_reg_resources; |
49cd5382 | 243 | |
cd88621a SG |
244 | /** |
245 | * struct iser_mem_reg - iSER memory registration info | |
246 | * | |
90a6684c SG |
247 | * @sge: memory region sg element |
248 | * @rkey: memory region remote key | |
cd88621a | 249 | * @mem_h: pointer to registration context (FMR/Fastreg) |
cd88621a | 250 | */ |
49cd5382 | 251 | struct iser_mem_reg { |
90a6684c SG |
252 | struct ib_sge sge; |
253 | u32 rkey; | |
254 | void *mem_h; | |
49cd5382 OG |
255 | }; |
256 | ||
49cd5382 | 257 | enum iser_desc_type { |
49cd5382 OG |
258 | ISCSI_TX_CONTROL , |
259 | ISCSI_TX_SCSI_COMMAND, | |
260 | ISCSI_TX_DATAOUT | |
261 | }; | |
262 | ||
7332bed0 SG |
263 | /* Maximum number of work requests per task: |
264 | * Data memory region local invalidate + fast registration | |
265 | * Protection memory region local invalidate + fast registration | |
266 | * Signature memory region local invalidate + fast registration | |
267 | * PDU send | |
268 | */ | |
269 | #define ISER_MAX_WRS 7 | |
270 | ||
cd88621a SG |
271 | /** |
272 | * struct iser_tx_desc - iSER TX descriptor (for send wr_id) | |
273 | * | |
274 | * @iser_header: iser header | |
275 | * @iscsi_header: iscsi header | |
276 | * @type: command/control/dataout | |
277 | * @dam_addr: header buffer dma_address | |
278 | * @tx_sg: sg[0] points to iser/iscsi headers | |
279 | * sg[1] optionally points to either of immediate data | |
280 | * unsolicited data-out or control | |
281 | * @num_sge: number sges used on this TX task | |
8d5944d8 | 282 | * @mapped: Is the task header mapped |
7332bed0 SG |
283 | * @wr_idx: Current WR index |
284 | * @wrs: Array of WRs per task | |
285 | * @data_reg: Data buffer registration details | |
286 | * @prot_reg: Protection buffer registration details | |
287 | * @sig_attrs: Signature attributes | |
cd88621a | 288 | */ |
f19624aa | 289 | struct iser_tx_desc { |
49cd5382 OG |
290 | struct iser_hdr iser_header; |
291 | struct iscsi_hdr iscsi_header; | |
49cd5382 | 292 | enum iser_desc_type type; |
f19624aa | 293 | u64 dma_addr; |
f19624aa OG |
294 | struct ib_sge tx_sg[2]; |
295 | int num_sge; | |
8d5944d8 | 296 | bool mapped; |
7332bed0 | 297 | u8 wr_idx; |
e622f2f4 CH |
298 | union iser_wr { |
299 | struct ib_send_wr send; | |
39405885 | 300 | struct ib_reg_wr fast_reg; |
e622f2f4 CH |
301 | struct ib_sig_handover_wr sig; |
302 | } wrs[ISER_MAX_WRS]; | |
7332bed0 SG |
303 | struct iser_mem_reg data_reg; |
304 | struct iser_mem_reg prot_reg; | |
305 | struct ib_sig_attrs sig_attrs; | |
49cd5382 OG |
306 | }; |
307 | ||
bcc60c38 OG |
308 | #define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \ |
309 | sizeof(u64) + sizeof(struct ib_sge))) | |
cd88621a SG |
310 | /** |
311 | * struct iser_rx_desc - iSER RX descriptor (for recv wr_id) | |
312 | * | |
313 | * @iser_header: iser header | |
314 | * @iscsi_header: iscsi header | |
315 | * @data: received data segment | |
316 | * @dma_addr: receive buffer dma address | |
317 | * @rx_sg: ib_sge of receive buffer | |
318 | * @pad: for sense data TODO: Modify to maximum sense length supported | |
319 | */ | |
bcc60c38 OG |
320 | struct iser_rx_desc { |
321 | struct iser_hdr iser_header; | |
322 | struct iscsi_hdr iscsi_header; | |
323 | char data[ISER_RECV_DATA_SEG_LEN]; | |
324 | u64 dma_addr; | |
325 | struct ib_sge rx_sg; | |
326 | char pad[ISER_RX_PAD_SIZE]; | |
327 | } __attribute__((packed)); | |
328 | ||
0f512b34 SG |
329 | |
330 | /** | |
331 | * struct iser_login_desc - iSER login descriptor | |
332 | * | |
333 | * @req: pointer to login request buffer | |
334 | * @resp: pointer to login response buffer | |
335 | * @req_dma: DMA address of login request buffer | |
336 | * @rsp_dma: DMA address of login response buffer | |
337 | * @sge: IB sge for login post recv | |
338 | */ | |
339 | struct iser_login_desc { | |
340 | void *req; | |
341 | void *rsp; | |
342 | u64 req_dma; | |
343 | u64 rsp_dma; | |
344 | struct ib_sge sge; | |
345 | } __attribute__((packed)); | |
346 | ||
347 | ||
b4e155ff | 348 | struct iser_conn; |
a4ee3539 | 349 | struct ib_conn; |
b4e155ff SG |
350 | struct iscsi_iser_task; |
351 | ||
bf175540 SG |
352 | /** |
353 | * struct iser_comp - iSER completion context | |
354 | * | |
355 | * @device: pointer to device handle | |
6aabfa76 | 356 | * @cq: completion queue |
6e6fe2fb | 357 | * @wcs: work completion array |
bf175540 SG |
358 | * @tasklet: Tasklet handle |
359 | * @active_qps: Number of active QPs attached | |
360 | * to completion context | |
361 | */ | |
362 | struct iser_comp { | |
363 | struct iser_device *device; | |
6aabfa76 | 364 | struct ib_cq *cq; |
6e6fe2fb | 365 | struct ib_wc wcs[ISER_WC_BATCH_COUNT]; |
bf175540 SG |
366 | struct tasklet_struct tasklet; |
367 | int active_qps; | |
368 | }; | |
369 | ||
48afbff6 SG |
370 | /** |
371 | * struct iser_device - Memory registration operations | |
372 | * per-device registration schemes | |
373 | * | |
374 | * @alloc_reg_res: Allocate registration resources | |
375 | * @free_reg_res: Free registration resources | |
32467c42 SG |
376 | * @fast_reg_mem: Register memory buffers |
377 | * @unreg_mem: Un-register memory buffers | |
81722909 SG |
378 | * @reg_desc_get: Get a registration descriptor for pool |
379 | * @reg_desc_put: Get a registration descriptor to pool | |
48afbff6 SG |
380 | */ |
381 | struct iser_reg_ops { | |
382 | int (*alloc_reg_res)(struct ib_conn *ib_conn, | |
f8db651d SG |
383 | unsigned cmds_max, |
384 | unsigned int size); | |
48afbff6 | 385 | void (*free_reg_res)(struct ib_conn *ib_conn); |
32467c42 SG |
386 | int (*reg_mem)(struct iscsi_iser_task *iser_task, |
387 | struct iser_data_buf *mem, | |
388 | struct iser_reg_resources *rsc, | |
389 | struct iser_mem_reg *reg); | |
390 | void (*unreg_mem)(struct iscsi_iser_task *iser_task, | |
391 | enum iser_data_dir cmd_dir); | |
81722909 SG |
392 | struct iser_fr_desc * (*reg_desc_get)(struct ib_conn *ib_conn); |
393 | void (*reg_desc_put)(struct ib_conn *ib_conn, | |
394 | struct iser_fr_desc *desc); | |
48afbff6 SG |
395 | }; |
396 | ||
cd88621a SG |
397 | /** |
398 | * struct iser_device - iSER device handle | |
399 | * | |
400 | * @ib_device: RDMA device | |
401 | * @pd: Protection Domain for this device | |
402 | * @dev_attr: Device attributes container | |
403 | * @mr: Global DMA memory region | |
404 | * @event_handler: IB events handle routine | |
405 | * @ig_list: entry in devices list | |
406 | * @refcount: Reference counter, dominated by open iser connections | |
407 | * @comps_used: Number of completion contexts used, Min between online | |
408 | * cpus and device max completion vectors | |
409 | * @comps: Dinamically allocated array of completion handlers | |
48afbff6 | 410 | * @reg_ops: Registration ops |
cd88621a | 411 | */ |
49cd5382 OG |
412 | struct iser_device { |
413 | struct ib_device *ib_device; | |
414 | struct ib_pd *pd; | |
65198d6b | 415 | struct ib_device_attr dev_attr; |
49cd5382 | 416 | struct ib_mr *mr; |
2110f9bf | 417 | struct ib_event_handler event_handler; |
cd88621a | 418 | struct list_head ig_list; |
49cd5382 | 419 | int refcount; |
bf175540 | 420 | int comps_used; |
da64bdb2 | 421 | struct iser_comp *comps; |
48afbff6 | 422 | struct iser_reg_ops *reg_ops; |
49cd5382 OG |
423 | }; |
424 | ||
177e31bd SG |
425 | #define ISER_CHECK_GUARD 0xc0 |
426 | #define ISER_CHECK_REFTAG 0x0f | |
427 | #define ISER_CHECK_APPTAG 0x30 | |
428 | ||
d711d81d SG |
429 | /** |
430 | * struct iser_reg_resources - Fast registration recources | |
431 | * | |
432 | * @mr: memory region | |
2b3bf958 | 433 | * @fmr_pool: pool of fmrs |
2b3bf958 | 434 | * @page_vec: fast reg page list used by fmr pool |
d711d81d SG |
435 | * @mr_valid: is mr valid indicator |
436 | */ | |
437 | struct iser_reg_resources { | |
2b3bf958 AL |
438 | union { |
439 | struct ib_mr *mr; | |
440 | struct ib_fmr_pool *fmr_pool; | |
441 | }; | |
39405885 | 442 | struct iser_page_vec *page_vec; |
d711d81d | 443 | u8 mr_valid:1; |
6b5a8fb0 AT |
444 | }; |
445 | ||
cd88621a SG |
446 | /** |
447 | * struct iser_pi_context - Protection information context | |
448 | * | |
d711d81d SG |
449 | * @rsc: protection buffer registration resources |
450 | * @sig_mr: signature enable memory region | |
451 | * @sig_mr_valid: is sig_mr valid indicator | |
452 | * @sig_protected: is region protected indicator | |
cd88621a | 453 | */ |
6b5a8fb0 | 454 | struct iser_pi_context { |
d711d81d | 455 | struct iser_reg_resources rsc; |
6b5a8fb0 | 456 | struct ib_mr *sig_mr; |
d711d81d SG |
457 | u8 sig_mr_valid:1; |
458 | u8 sig_protected:1; | |
73bc06b7 SG |
459 | }; |
460 | ||
cd88621a | 461 | /** |
5190cc26 | 462 | * struct iser_fr_desc - Fast registration descriptor |
cd88621a SG |
463 | * |
464 | * @list: entry in connection fastreg pool | |
d711d81d | 465 | * @rsc: data buffer registration resources |
cd88621a | 466 | * @pi_ctx: protection information context |
cd88621a | 467 | */ |
5190cc26 | 468 | struct iser_fr_desc { |
5587856c | 469 | struct list_head list; |
d711d81d | 470 | struct iser_reg_resources rsc; |
6b5a8fb0 | 471 | struct iser_pi_context *pi_ctx; |
5587856c SG |
472 | }; |
473 | ||
385ad87d SG |
474 | /** |
475 | * struct iser_fr_pool: connection fast registration pool | |
476 | * | |
2b3bf958 | 477 | * @list: list of fastreg descriptors |
385ad87d | 478 | * @lock: protects fmr/fastreg pool |
2b3bf958 | 479 | * @size: size of the pool |
385ad87d SG |
480 | */ |
481 | struct iser_fr_pool { | |
2b3bf958 AL |
482 | struct list_head list; |
483 | spinlock_t lock; | |
484 | int size; | |
385ad87d SG |
485 | }; |
486 | ||
a4ee3539 SG |
487 | /** |
488 | * struct ib_conn - Infiniband related objects | |
489 | * | |
490 | * @cma_id: rdma_cm connection maneger handle | |
491 | * @qp: Connection Queue-pair | |
492 | * @post_recv_buf_count: post receive counter | |
6ec9d4d2 | 493 | * @sig_count: send work request signal count |
a4ee3539 SG |
494 | * @rx_wr: receive work request for batch posts |
495 | * @device: reference to iser device | |
bf175540 | 496 | * @comp: iser completion context |
a4ee3539 | 497 | * @pi_support: Indicate device T10-PI support |
ff3dd52d | 498 | * @beacon: beacon send wr to signal all flush errors were drained |
6aabfa76 | 499 | * @flush_comp: completes when all connection completions consumed |
385ad87d | 500 | * @fr_pool: connection fast registration poool |
a4ee3539 SG |
501 | */ |
502 | struct ib_conn { | |
503 | struct rdma_cm_id *cma_id; | |
504 | struct ib_qp *qp; | |
505 | int post_recv_buf_count; | |
6ec9d4d2 | 506 | u8 sig_count; |
a4ee3539 SG |
507 | struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX]; |
508 | struct iser_device *device; | |
bf175540 | 509 | struct iser_comp *comp; |
a4ee3539 | 510 | bool pi_support; |
ff3dd52d | 511 | struct ib_send_wr beacon; |
6aabfa76 | 512 | struct completion flush_comp; |
385ad87d | 513 | struct iser_fr_pool fr_pool; |
a4ee3539 SG |
514 | }; |
515 | ||
cd88621a SG |
516 | /** |
517 | * struct iser_conn - iSER connection context | |
518 | * | |
519 | * @ib_conn: connection RDMA resources | |
520 | * @iscsi_conn: link to matching iscsi connection | |
521 | * @ep: transport handle | |
522 | * @state: connection logical state | |
523 | * @qp_max_recv_dtos: maximum number of data outs, corresponds | |
524 | * to max number of post recvs | |
525 | * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1) | |
526 | * @min_posted_rx: (qp_max_recv_dtos >> 2) | |
f4641ef7 | 527 | * @max_cmds: maximum cmds allowed for this connection |
cd88621a SG |
528 | * @name: connection peer portal |
529 | * @release_work: deffered work for release job | |
530 | * @state_mutex: protects iser onnection state | |
531 | * @stop_completion: conn_stop completion | |
532 | * @ib_completion: RDMA cleanup completion | |
533 | * @up_completion: connection establishment completed | |
534 | * (state is ISER_CONN_UP) | |
535 | * @conn_list: entry in ig conn list | |
0f512b34 | 536 | * @login_desc: login descriptor |
cd88621a SG |
537 | * @rx_desc_head: head of rx_descs cyclic buffer |
538 | * @rx_descs: rx buffers array (cyclic buffer) | |
539 | * @num_rx_descs: number of rx descriptors | |
df749cdc SG |
540 | * @scsi_sg_tablesize: scsi host sg_tablesize |
541 | * @scsi_max_sectors: scsi host max sectors | |
cd88621a | 542 | */ |
49cd5382 | 543 | struct iser_conn { |
a4ee3539 | 544 | struct ib_conn ib_conn; |
4667f5df | 545 | struct iscsi_conn *iscsi_conn; |
412eeafa | 546 | struct iscsi_endpoint *ep; |
cd88621a SG |
547 | enum iser_conn_state state; |
548 | unsigned qp_max_recv_dtos; | |
549 | unsigned qp_max_recv_dtos_mask; | |
550 | unsigned min_posted_rx; | |
f4641ef7 | 551 | u16 max_cmds; |
49cd5382 | 552 | char name[ISER_OBJECT_NAME_SIZE]; |
b73c3ada | 553 | struct work_struct release_work; |
504130c0 | 554 | struct mutex state_mutex; |
c47a3c9e SG |
555 | struct completion stop_completion; |
556 | struct completion ib_completion; | |
9a6d3234 | 557 | struct completion up_completion; |
cd88621a | 558 | struct list_head conn_list; |
0f512b34 | 559 | struct iser_login_desc login_desc; |
bcc60c38 OG |
560 | unsigned int rx_desc_head; |
561 | struct iser_rx_desc *rx_descs; | |
6aabfa76 | 562 | u32 num_rx_descs; |
df749cdc SG |
563 | unsigned short scsi_sg_tablesize; |
564 | unsigned int scsi_max_sectors; | |
49cd5382 OG |
565 | }; |
566 | ||
cd88621a SG |
567 | /** |
568 | * struct iscsi_iser_task - iser task context | |
569 | * | |
570 | * @desc: TX descriptor | |
571 | * @iser_conn: link to iser connection | |
572 | * @status: current task status | |
573 | * @sc: link to scsi command | |
574 | * @command_sent: indicate if command was sent | |
575 | * @dir: iser data direction | |
b130eded | 576 | * @rdma_reg: task rdma registration desc |
cd88621a | 577 | * @data: iser data buffer desc |
cd88621a | 578 | * @prot: iser protection buffer desc |
cd88621a | 579 | */ |
2261ec3d | 580 | struct iscsi_iser_task { |
f19624aa | 581 | struct iser_tx_desc desc; |
5716af6e | 582 | struct iser_conn *iser_conn; |
49cd5382 | 583 | enum iser_task_status status; |
177e31bd | 584 | struct scsi_cmnd *sc; |
cd88621a SG |
585 | int command_sent; |
586 | int dir[ISER_DIRS_NUM]; | |
b130eded | 587 | struct iser_mem_reg rdma_reg[ISER_DIRS_NUM]; |
cd88621a | 588 | struct iser_data_buf data[ISER_DIRS_NUM]; |
cd88621a | 589 | struct iser_data_buf prot[ISER_DIRS_NUM]; |
49cd5382 OG |
590 | }; |
591 | ||
592 | struct iser_page_vec { | |
593 | u64 *pages; | |
594 | int length; | |
595 | int offset; | |
596 | int data_size; | |
597 | }; | |
598 | ||
cd88621a SG |
599 | /** |
600 | * struct iser_global: iSER global context | |
601 | * | |
602 | * @device_list_mutex: protects device_list | |
603 | * @device_list: iser devices global list | |
604 | * @connlist_mutex: protects connlist | |
605 | * @connlist: iser connections global list | |
606 | * @desc_cache: kmem cache for tx dataout | |
607 | */ | |
49cd5382 | 608 | struct iser_global { |
cd88621a SG |
609 | struct mutex device_list_mutex; |
610 | struct list_head device_list; | |
49cd5382 | 611 | struct mutex connlist_mutex; |
cd88621a | 612 | struct list_head connlist; |
e54f8188 | 613 | struct kmem_cache *desc_cache; |
49cd5382 OG |
614 | }; |
615 | ||
616 | extern struct iser_global ig; | |
617 | extern int iser_debug_level; | |
7f733847 AT |
618 | extern bool iser_pi_enable; |
619 | extern int iser_pi_guard; | |
df749cdc | 620 | extern unsigned int iser_max_sectors; |
3cffd930 | 621 | extern bool iser_always_reg; |
49cd5382 | 622 | |
48afbff6 SG |
623 | int iser_assign_reg_ops(struct iser_device *device); |
624 | ||
2747fdb2 | 625 | int iser_send_control(struct iscsi_conn *conn, |
2261ec3d | 626 | struct iscsi_task *task); |
49cd5382 | 627 | |
2747fdb2 | 628 | int iser_send_command(struct iscsi_conn *conn, |
2261ec3d | 629 | struct iscsi_task *task); |
49cd5382 | 630 | |
2747fdb2 | 631 | int iser_send_data_out(struct iscsi_conn *conn, |
2261ec3d | 632 | struct iscsi_task *task, |
2747fdb2 | 633 | struct iscsi_data *hdr); |
49cd5382 OG |
634 | |
635 | void iscsi_iser_recv(struct iscsi_conn *conn, | |
cd88621a SG |
636 | struct iscsi_hdr *hdr, |
637 | char *rx_data, | |
638 | int rx_data_len); | |
49cd5382 | 639 | |
5716af6e | 640 | void iser_conn_init(struct iser_conn *iser_conn); |
49cd5382 | 641 | |
5716af6e | 642 | void iser_conn_release(struct iser_conn *iser_conn); |
49cd5382 | 643 | |
c47a3c9e | 644 | int iser_conn_terminate(struct iser_conn *iser_conn); |
49cd5382 | 645 | |
b73c3ada AN |
646 | void iser_release_work(struct work_struct *work); |
647 | ||
bcc60c38 | 648 | void iser_rcv_completion(struct iser_rx_desc *desc, |
cd88621a | 649 | unsigned long dto_xfer_len, |
a4ee3539 | 650 | struct ib_conn *ib_conn); |
49cd5382 | 651 | |
5716af6e | 652 | void iser_snd_completion(struct iser_tx_desc *desc, |
a4ee3539 | 653 | struct ib_conn *ib_conn); |
49cd5382 | 654 | |
2261ec3d | 655 | void iser_task_rdma_init(struct iscsi_iser_task *task); |
49cd5382 | 656 | |
2261ec3d | 657 | void iser_task_rdma_finalize(struct iscsi_iser_task *task); |
49cd5382 | 658 | |
5716af6e | 659 | void iser_free_rx_descriptors(struct iser_conn *iser_conn); |
bcc60c38 | 660 | |
9a8b08fa SG |
661 | void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, |
662 | struct iser_data_buf *mem, | |
9a8b08fa | 663 | enum iser_data_dir cmd_dir); |
49cd5382 | 664 | |
32467c42 SG |
665 | int iser_reg_rdma_mem(struct iscsi_iser_task *task, |
666 | enum iser_data_dir dir); | |
667 | void iser_unreg_rdma_mem(struct iscsi_iser_task *task, | |
668 | enum iser_data_dir dir); | |
49cd5382 | 669 | |
cd88621a SG |
670 | int iser_connect(struct iser_conn *iser_conn, |
671 | struct sockaddr *src_addr, | |
672 | struct sockaddr *dst_addr, | |
673 | int non_blocking); | |
49cd5382 | 674 | |
e657571b SG |
675 | void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task, |
676 | enum iser_data_dir cmd_dir); | |
7306b8fa SG |
677 | void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, |
678 | enum iser_data_dir cmd_dir); | |
49cd5382 | 679 | |
5716af6e SG |
680 | int iser_post_recvl(struct iser_conn *iser_conn); |
681 | int iser_post_recvm(struct iser_conn *iser_conn, int count); | |
6df5a128 SG |
682 | int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, |
683 | bool signal); | |
49cd5382 | 684 | |
2261ec3d | 685 | int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, |
cd88621a SG |
686 | struct iser_data_buf *data, |
687 | enum iser_data_dir iser_dir, | |
688 | enum dma_data_direction dma_dir); | |
74a20780 | 689 | |
9a8b08fa | 690 | void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, |
c6c95ef4 RD |
691 | struct iser_data_buf *data, |
692 | enum dma_data_direction dir); | |
693 | ||
f19624aa OG |
694 | int iser_initialize_task_headers(struct iscsi_task *task, |
695 | struct iser_tx_desc *tx_desc); | |
5716af6e SG |
696 | int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, |
697 | struct iscsi_session *session); | |
f8db651d SG |
698 | int iser_alloc_fmr_pool(struct ib_conn *ib_conn, |
699 | unsigned cmds_max, | |
700 | unsigned int size); | |
a4ee3539 | 701 | void iser_free_fmr_pool(struct ib_conn *ib_conn); |
f8db651d SG |
702 | int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, |
703 | unsigned cmds_max, | |
704 | unsigned int size); | |
a4ee3539 | 705 | void iser_free_fastreg_pool(struct ib_conn *ib_conn); |
0a7a08ad SG |
706 | u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, |
707 | enum iser_data_dir cmd_dir, sector_t *sector); | |
5190cc26 | 708 | struct iser_fr_desc * |
81722909 | 709 | iser_reg_desc_get_fr(struct ib_conn *ib_conn); |
bd8b944e | 710 | void |
81722909 SG |
711 | iser_reg_desc_put_fr(struct ib_conn *ib_conn, |
712 | struct iser_fr_desc *desc); | |
713 | struct iser_fr_desc * | |
714 | iser_reg_desc_get_fmr(struct ib_conn *ib_conn); | |
715 | void | |
716 | iser_reg_desc_put_fmr(struct ib_conn *ib_conn, | |
717 | struct iser_fr_desc *desc); | |
7332bed0 SG |
718 | |
719 | static inline struct ib_send_wr * | |
720 | iser_tx_next_wr(struct iser_tx_desc *tx_desc) | |
721 | { | |
e622f2f4 | 722 | struct ib_send_wr *cur_wr = &tx_desc->wrs[tx_desc->wr_idx].send; |
7332bed0 SG |
723 | struct ib_send_wr *last_wr; |
724 | ||
725 | if (tx_desc->wr_idx) { | |
e622f2f4 | 726 | last_wr = &tx_desc->wrs[tx_desc->wr_idx - 1].send; |
7332bed0 SG |
727 | last_wr->next = cur_wr; |
728 | } | |
729 | tx_desc->wr_idx++; | |
730 | ||
731 | return cur_wr; | |
732 | } | |
733 | ||
7edc5a99 SG |
734 | static inline struct iser_conn * |
735 | to_iser_conn(struct ib_conn *ib_conn) | |
736 | { | |
737 | return container_of(ib_conn, struct iser_conn, ib_conn); | |
738 | } | |
739 | ||
49cd5382 | 740 | #endif |