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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 | |
e3784bd1 SG |
230 | * @orig_sg: pointer to the original sg list (in case |
231 | * we used a copy) | |
ba943fb2 | 232 | * @orig_size: num entris of orig sg list |
cd88621a | 233 | */ |
49cd5382 | 234 | struct iser_data_buf { |
e3784bd1 | 235 | struct scatterlist *sg; |
cd88621a SG |
236 | unsigned int size; |
237 | unsigned long data_len; | |
238 | unsigned int dma_nents; | |
e3784bd1 | 239 | struct scatterlist *orig_sg; |
ba943fb2 | 240 | unsigned int orig_size; |
49cd5382 OG |
241 | }; |
242 | ||
243 | /* fwd declarations */ | |
244 | struct iser_device; | |
2261ec3d | 245 | struct iscsi_iser_task; |
412eeafa | 246 | struct iscsi_endpoint; |
32467c42 | 247 | struct iser_reg_resources; |
49cd5382 | 248 | |
cd88621a SG |
249 | /** |
250 | * struct iser_mem_reg - iSER memory registration info | |
251 | * | |
90a6684c SG |
252 | * @sge: memory region sg element |
253 | * @rkey: memory region remote key | |
cd88621a | 254 | * @mem_h: pointer to registration context (FMR/Fastreg) |
cd88621a | 255 | */ |
49cd5382 | 256 | struct iser_mem_reg { |
90a6684c SG |
257 | struct ib_sge sge; |
258 | u32 rkey; | |
259 | void *mem_h; | |
49cd5382 OG |
260 | }; |
261 | ||
49cd5382 | 262 | enum iser_desc_type { |
49cd5382 OG |
263 | ISCSI_TX_CONTROL , |
264 | ISCSI_TX_SCSI_COMMAND, | |
265 | ISCSI_TX_DATAOUT | |
266 | }; | |
267 | ||
7332bed0 SG |
268 | /* Maximum number of work requests per task: |
269 | * Data memory region local invalidate + fast registration | |
270 | * Protection memory region local invalidate + fast registration | |
271 | * Signature memory region local invalidate + fast registration | |
272 | * PDU send | |
273 | */ | |
274 | #define ISER_MAX_WRS 7 | |
275 | ||
cd88621a SG |
276 | /** |
277 | * struct iser_tx_desc - iSER TX descriptor (for send wr_id) | |
278 | * | |
279 | * @iser_header: iser header | |
280 | * @iscsi_header: iscsi header | |
281 | * @type: command/control/dataout | |
282 | * @dam_addr: header buffer dma_address | |
283 | * @tx_sg: sg[0] points to iser/iscsi headers | |
284 | * sg[1] optionally points to either of immediate data | |
285 | * unsolicited data-out or control | |
286 | * @num_sge: number sges used on this TX task | |
8d5944d8 | 287 | * @mapped: Is the task header mapped |
7332bed0 SG |
288 | * @wr_idx: Current WR index |
289 | * @wrs: Array of WRs per task | |
290 | * @data_reg: Data buffer registration details | |
291 | * @prot_reg: Protection buffer registration details | |
292 | * @sig_attrs: Signature attributes | |
cd88621a | 293 | */ |
f19624aa | 294 | struct iser_tx_desc { |
49cd5382 OG |
295 | struct iser_hdr iser_header; |
296 | struct iscsi_hdr iscsi_header; | |
49cd5382 | 297 | enum iser_desc_type type; |
f19624aa | 298 | u64 dma_addr; |
f19624aa OG |
299 | struct ib_sge tx_sg[2]; |
300 | int num_sge; | |
8d5944d8 | 301 | bool mapped; |
7332bed0 SG |
302 | u8 wr_idx; |
303 | struct ib_send_wr wrs[ISER_MAX_WRS]; | |
304 | struct iser_mem_reg data_reg; | |
305 | struct iser_mem_reg prot_reg; | |
306 | struct ib_sig_attrs sig_attrs; | |
49cd5382 OG |
307 | }; |
308 | ||
bcc60c38 OG |
309 | #define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \ |
310 | sizeof(u64) + sizeof(struct ib_sge))) | |
cd88621a SG |
311 | /** |
312 | * struct iser_rx_desc - iSER RX descriptor (for recv wr_id) | |
313 | * | |
314 | * @iser_header: iser header | |
315 | * @iscsi_header: iscsi header | |
316 | * @data: received data segment | |
317 | * @dma_addr: receive buffer dma address | |
318 | * @rx_sg: ib_sge of receive buffer | |
319 | * @pad: for sense data TODO: Modify to maximum sense length supported | |
320 | */ | |
bcc60c38 OG |
321 | struct iser_rx_desc { |
322 | struct iser_hdr iser_header; | |
323 | struct iscsi_hdr iscsi_header; | |
324 | char data[ISER_RECV_DATA_SEG_LEN]; | |
325 | u64 dma_addr; | |
326 | struct ib_sge rx_sg; | |
327 | char pad[ISER_RX_PAD_SIZE]; | |
328 | } __attribute__((packed)); | |
329 | ||
b4e155ff | 330 | struct iser_conn; |
a4ee3539 | 331 | struct ib_conn; |
b4e155ff SG |
332 | struct iscsi_iser_task; |
333 | ||
bf175540 SG |
334 | /** |
335 | * struct iser_comp - iSER completion context | |
336 | * | |
337 | * @device: pointer to device handle | |
6aabfa76 | 338 | * @cq: completion queue |
6e6fe2fb | 339 | * @wcs: work completion array |
bf175540 SG |
340 | * @tasklet: Tasklet handle |
341 | * @active_qps: Number of active QPs attached | |
342 | * to completion context | |
343 | */ | |
344 | struct iser_comp { | |
345 | struct iser_device *device; | |
6aabfa76 | 346 | struct ib_cq *cq; |
6e6fe2fb | 347 | struct ib_wc wcs[ISER_WC_BATCH_COUNT]; |
bf175540 SG |
348 | struct tasklet_struct tasklet; |
349 | int active_qps; | |
350 | }; | |
351 | ||
48afbff6 SG |
352 | /** |
353 | * struct iser_device - Memory registration operations | |
354 | * per-device registration schemes | |
355 | * | |
356 | * @alloc_reg_res: Allocate registration resources | |
357 | * @free_reg_res: Free registration resources | |
32467c42 SG |
358 | * @fast_reg_mem: Register memory buffers |
359 | * @unreg_mem: Un-register memory buffers | |
81722909 SG |
360 | * @reg_desc_get: Get a registration descriptor for pool |
361 | * @reg_desc_put: Get a registration descriptor to pool | |
48afbff6 SG |
362 | */ |
363 | struct iser_reg_ops { | |
364 | int (*alloc_reg_res)(struct ib_conn *ib_conn, | |
f8db651d SG |
365 | unsigned cmds_max, |
366 | unsigned int size); | |
48afbff6 | 367 | void (*free_reg_res)(struct ib_conn *ib_conn); |
32467c42 SG |
368 | int (*reg_mem)(struct iscsi_iser_task *iser_task, |
369 | struct iser_data_buf *mem, | |
370 | struct iser_reg_resources *rsc, | |
371 | struct iser_mem_reg *reg); | |
372 | void (*unreg_mem)(struct iscsi_iser_task *iser_task, | |
373 | enum iser_data_dir cmd_dir); | |
81722909 SG |
374 | struct iser_fr_desc * (*reg_desc_get)(struct ib_conn *ib_conn); |
375 | void (*reg_desc_put)(struct ib_conn *ib_conn, | |
376 | struct iser_fr_desc *desc); | |
48afbff6 SG |
377 | }; |
378 | ||
cd88621a SG |
379 | /** |
380 | * struct iser_device - iSER device handle | |
381 | * | |
382 | * @ib_device: RDMA device | |
383 | * @pd: Protection Domain for this device | |
384 | * @dev_attr: Device attributes container | |
385 | * @mr: Global DMA memory region | |
386 | * @event_handler: IB events handle routine | |
387 | * @ig_list: entry in devices list | |
388 | * @refcount: Reference counter, dominated by open iser connections | |
389 | * @comps_used: Number of completion contexts used, Min between online | |
390 | * cpus and device max completion vectors | |
391 | * @comps: Dinamically allocated array of completion handlers | |
48afbff6 | 392 | * @reg_ops: Registration ops |
cd88621a | 393 | */ |
49cd5382 OG |
394 | struct iser_device { |
395 | struct ib_device *ib_device; | |
396 | struct ib_pd *pd; | |
65198d6b | 397 | struct ib_device_attr dev_attr; |
49cd5382 | 398 | struct ib_mr *mr; |
2110f9bf | 399 | struct ib_event_handler event_handler; |
cd88621a | 400 | struct list_head ig_list; |
49cd5382 | 401 | int refcount; |
bf175540 | 402 | int comps_used; |
da64bdb2 | 403 | struct iser_comp *comps; |
48afbff6 | 404 | struct iser_reg_ops *reg_ops; |
49cd5382 OG |
405 | }; |
406 | ||
177e31bd SG |
407 | #define ISER_CHECK_GUARD 0xc0 |
408 | #define ISER_CHECK_REFTAG 0x0f | |
409 | #define ISER_CHECK_APPTAG 0x30 | |
410 | ||
d711d81d SG |
411 | /** |
412 | * struct iser_reg_resources - Fast registration recources | |
413 | * | |
414 | * @mr: memory region | |
2b3bf958 AL |
415 | * @fmr_pool: pool of fmrs |
416 | * @frpl: fast reg page list used by frwrs | |
417 | * @page_vec: fast reg page list used by fmr pool | |
d711d81d SG |
418 | * @mr_valid: is mr valid indicator |
419 | */ | |
420 | struct iser_reg_resources { | |
2b3bf958 AL |
421 | union { |
422 | struct ib_mr *mr; | |
423 | struct ib_fmr_pool *fmr_pool; | |
424 | }; | |
425 | union { | |
426 | struct ib_fast_reg_page_list *frpl; | |
427 | struct iser_page_vec *page_vec; | |
428 | }; | |
d711d81d | 429 | u8 mr_valid:1; |
6b5a8fb0 AT |
430 | }; |
431 | ||
cd88621a SG |
432 | /** |
433 | * struct iser_pi_context - Protection information context | |
434 | * | |
d711d81d SG |
435 | * @rsc: protection buffer registration resources |
436 | * @sig_mr: signature enable memory region | |
437 | * @sig_mr_valid: is sig_mr valid indicator | |
438 | * @sig_protected: is region protected indicator | |
cd88621a | 439 | */ |
6b5a8fb0 | 440 | struct iser_pi_context { |
d711d81d | 441 | struct iser_reg_resources rsc; |
6b5a8fb0 | 442 | struct ib_mr *sig_mr; |
d711d81d SG |
443 | u8 sig_mr_valid:1; |
444 | u8 sig_protected:1; | |
73bc06b7 SG |
445 | }; |
446 | ||
cd88621a | 447 | /** |
5190cc26 | 448 | * struct iser_fr_desc - Fast registration descriptor |
cd88621a SG |
449 | * |
450 | * @list: entry in connection fastreg pool | |
d711d81d | 451 | * @rsc: data buffer registration resources |
cd88621a | 452 | * @pi_ctx: protection information context |
cd88621a | 453 | */ |
5190cc26 | 454 | struct iser_fr_desc { |
5587856c | 455 | struct list_head list; |
d711d81d | 456 | struct iser_reg_resources rsc; |
6b5a8fb0 | 457 | struct iser_pi_context *pi_ctx; |
5587856c SG |
458 | }; |
459 | ||
385ad87d SG |
460 | /** |
461 | * struct iser_fr_pool: connection fast registration pool | |
462 | * | |
2b3bf958 | 463 | * @list: list of fastreg descriptors |
385ad87d | 464 | * @lock: protects fmr/fastreg pool |
2b3bf958 | 465 | * @size: size of the pool |
385ad87d SG |
466 | */ |
467 | struct iser_fr_pool { | |
2b3bf958 AL |
468 | struct list_head list; |
469 | spinlock_t lock; | |
470 | int size; | |
385ad87d SG |
471 | }; |
472 | ||
a4ee3539 SG |
473 | /** |
474 | * struct ib_conn - Infiniband related objects | |
475 | * | |
476 | * @cma_id: rdma_cm connection maneger handle | |
477 | * @qp: Connection Queue-pair | |
478 | * @post_recv_buf_count: post receive counter | |
6ec9d4d2 | 479 | * @sig_count: send work request signal count |
a4ee3539 SG |
480 | * @rx_wr: receive work request for batch posts |
481 | * @device: reference to iser device | |
bf175540 | 482 | * @comp: iser completion context |
a4ee3539 | 483 | * @pi_support: Indicate device T10-PI support |
ff3dd52d | 484 | * @beacon: beacon send wr to signal all flush errors were drained |
6aabfa76 | 485 | * @flush_comp: completes when all connection completions consumed |
385ad87d | 486 | * @fr_pool: connection fast registration poool |
a4ee3539 SG |
487 | */ |
488 | struct ib_conn { | |
489 | struct rdma_cm_id *cma_id; | |
490 | struct ib_qp *qp; | |
491 | int post_recv_buf_count; | |
6ec9d4d2 | 492 | u8 sig_count; |
a4ee3539 SG |
493 | struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX]; |
494 | struct iser_device *device; | |
bf175540 | 495 | struct iser_comp *comp; |
a4ee3539 | 496 | bool pi_support; |
ff3dd52d | 497 | struct ib_send_wr beacon; |
6aabfa76 | 498 | struct completion flush_comp; |
385ad87d | 499 | struct iser_fr_pool fr_pool; |
a4ee3539 SG |
500 | }; |
501 | ||
cd88621a SG |
502 | /** |
503 | * struct iser_conn - iSER connection context | |
504 | * | |
505 | * @ib_conn: connection RDMA resources | |
506 | * @iscsi_conn: link to matching iscsi connection | |
507 | * @ep: transport handle | |
508 | * @state: connection logical state | |
509 | * @qp_max_recv_dtos: maximum number of data outs, corresponds | |
510 | * to max number of post recvs | |
511 | * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1) | |
512 | * @min_posted_rx: (qp_max_recv_dtos >> 2) | |
f4641ef7 | 513 | * @max_cmds: maximum cmds allowed for this connection |
cd88621a SG |
514 | * @name: connection peer portal |
515 | * @release_work: deffered work for release job | |
516 | * @state_mutex: protects iser onnection state | |
517 | * @stop_completion: conn_stop completion | |
518 | * @ib_completion: RDMA cleanup completion | |
519 | * @up_completion: connection establishment completed | |
520 | * (state is ISER_CONN_UP) | |
521 | * @conn_list: entry in ig conn list | |
522 | * @login_buf: login data buffer (stores login parameters) | |
523 | * @login_req_buf: login request buffer | |
524 | * @login_req_dma: login request buffer dma address | |
525 | * @login_resp_buf: login response buffer | |
526 | * @login_resp_dma: login response buffer dma address | |
527 | * @rx_desc_head: head of rx_descs cyclic buffer | |
528 | * @rx_descs: rx buffers array (cyclic buffer) | |
529 | * @num_rx_descs: number of rx descriptors | |
df749cdc SG |
530 | * @scsi_sg_tablesize: scsi host sg_tablesize |
531 | * @scsi_max_sectors: scsi host max sectors | |
cd88621a | 532 | */ |
49cd5382 | 533 | struct iser_conn { |
a4ee3539 | 534 | struct ib_conn ib_conn; |
4667f5df | 535 | struct iscsi_conn *iscsi_conn; |
412eeafa | 536 | struct iscsi_endpoint *ep; |
cd88621a SG |
537 | enum iser_conn_state state; |
538 | unsigned qp_max_recv_dtos; | |
539 | unsigned qp_max_recv_dtos_mask; | |
540 | unsigned min_posted_rx; | |
f4641ef7 | 541 | u16 max_cmds; |
49cd5382 | 542 | char name[ISER_OBJECT_NAME_SIZE]; |
b73c3ada | 543 | struct work_struct release_work; |
504130c0 | 544 | struct mutex state_mutex; |
c47a3c9e SG |
545 | struct completion stop_completion; |
546 | struct completion ib_completion; | |
9a6d3234 | 547 | struct completion up_completion; |
cd88621a | 548 | struct list_head conn_list; |
bcc60c38 OG |
549 | |
550 | char *login_buf; | |
2c4ce609 OG |
551 | char *login_req_buf, *login_resp_buf; |
552 | u64 login_req_dma, login_resp_dma; | |
bcc60c38 OG |
553 | unsigned int rx_desc_head; |
554 | struct iser_rx_desc *rx_descs; | |
6aabfa76 | 555 | u32 num_rx_descs; |
df749cdc SG |
556 | unsigned short scsi_sg_tablesize; |
557 | unsigned int scsi_max_sectors; | |
49cd5382 OG |
558 | }; |
559 | ||
cd88621a SG |
560 | /** |
561 | * struct iscsi_iser_task - iser task context | |
562 | * | |
563 | * @desc: TX descriptor | |
564 | * @iser_conn: link to iser connection | |
565 | * @status: current task status | |
566 | * @sc: link to scsi command | |
567 | * @command_sent: indicate if command was sent | |
568 | * @dir: iser data direction | |
b130eded | 569 | * @rdma_reg: task rdma registration desc |
cd88621a | 570 | * @data: iser data buffer desc |
cd88621a | 571 | * @prot: iser protection buffer desc |
cd88621a | 572 | */ |
2261ec3d | 573 | struct iscsi_iser_task { |
f19624aa | 574 | struct iser_tx_desc desc; |
5716af6e | 575 | struct iser_conn *iser_conn; |
49cd5382 | 576 | enum iser_task_status status; |
177e31bd | 577 | struct scsi_cmnd *sc; |
cd88621a SG |
578 | int command_sent; |
579 | int dir[ISER_DIRS_NUM]; | |
b130eded | 580 | struct iser_mem_reg rdma_reg[ISER_DIRS_NUM]; |
cd88621a | 581 | struct iser_data_buf data[ISER_DIRS_NUM]; |
cd88621a | 582 | struct iser_data_buf prot[ISER_DIRS_NUM]; |
49cd5382 OG |
583 | }; |
584 | ||
585 | struct iser_page_vec { | |
586 | u64 *pages; | |
587 | int length; | |
588 | int offset; | |
589 | int data_size; | |
590 | }; | |
591 | ||
cd88621a SG |
592 | /** |
593 | * struct iser_global: iSER global context | |
594 | * | |
595 | * @device_list_mutex: protects device_list | |
596 | * @device_list: iser devices global list | |
597 | * @connlist_mutex: protects connlist | |
598 | * @connlist: iser connections global list | |
599 | * @desc_cache: kmem cache for tx dataout | |
600 | */ | |
49cd5382 | 601 | struct iser_global { |
cd88621a SG |
602 | struct mutex device_list_mutex; |
603 | struct list_head device_list; | |
49cd5382 | 604 | struct mutex connlist_mutex; |
cd88621a | 605 | struct list_head connlist; |
e54f8188 | 606 | struct kmem_cache *desc_cache; |
49cd5382 OG |
607 | }; |
608 | ||
609 | extern struct iser_global ig; | |
610 | extern int iser_debug_level; | |
7f733847 AT |
611 | extern bool iser_pi_enable; |
612 | extern int iser_pi_guard; | |
df749cdc | 613 | extern unsigned int iser_max_sectors; |
3cffd930 | 614 | extern bool iser_always_reg; |
49cd5382 | 615 | |
48afbff6 SG |
616 | int iser_assign_reg_ops(struct iser_device *device); |
617 | ||
2747fdb2 | 618 | int iser_send_control(struct iscsi_conn *conn, |
2261ec3d | 619 | struct iscsi_task *task); |
49cd5382 | 620 | |
2747fdb2 | 621 | int iser_send_command(struct iscsi_conn *conn, |
2261ec3d | 622 | struct iscsi_task *task); |
49cd5382 | 623 | |
2747fdb2 | 624 | int iser_send_data_out(struct iscsi_conn *conn, |
2261ec3d | 625 | struct iscsi_task *task, |
2747fdb2 | 626 | struct iscsi_data *hdr); |
49cd5382 OG |
627 | |
628 | void iscsi_iser_recv(struct iscsi_conn *conn, | |
cd88621a SG |
629 | struct iscsi_hdr *hdr, |
630 | char *rx_data, | |
631 | int rx_data_len); | |
49cd5382 | 632 | |
5716af6e | 633 | void iser_conn_init(struct iser_conn *iser_conn); |
49cd5382 | 634 | |
5716af6e | 635 | void iser_conn_release(struct iser_conn *iser_conn); |
49cd5382 | 636 | |
c47a3c9e | 637 | int iser_conn_terminate(struct iser_conn *iser_conn); |
49cd5382 | 638 | |
b73c3ada AN |
639 | void iser_release_work(struct work_struct *work); |
640 | ||
bcc60c38 | 641 | void iser_rcv_completion(struct iser_rx_desc *desc, |
cd88621a | 642 | unsigned long dto_xfer_len, |
a4ee3539 | 643 | struct ib_conn *ib_conn); |
49cd5382 | 644 | |
5716af6e | 645 | void iser_snd_completion(struct iser_tx_desc *desc, |
a4ee3539 | 646 | struct ib_conn *ib_conn); |
49cd5382 | 647 | |
2261ec3d | 648 | void iser_task_rdma_init(struct iscsi_iser_task *task); |
49cd5382 | 649 | |
2261ec3d | 650 | void iser_task_rdma_finalize(struct iscsi_iser_task *task); |
49cd5382 | 651 | |
5716af6e | 652 | void iser_free_rx_descriptors(struct iser_conn *iser_conn); |
bcc60c38 | 653 | |
9a8b08fa SG |
654 | void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, |
655 | struct iser_data_buf *mem, | |
9a8b08fa | 656 | enum iser_data_dir cmd_dir); |
49cd5382 | 657 | |
32467c42 SG |
658 | int iser_reg_rdma_mem(struct iscsi_iser_task *task, |
659 | enum iser_data_dir dir); | |
660 | void iser_unreg_rdma_mem(struct iscsi_iser_task *task, | |
661 | enum iser_data_dir dir); | |
49cd5382 | 662 | |
cd88621a SG |
663 | int iser_connect(struct iser_conn *iser_conn, |
664 | struct sockaddr *src_addr, | |
665 | struct sockaddr *dst_addr, | |
666 | int non_blocking); | |
49cd5382 | 667 | |
e657571b SG |
668 | void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task, |
669 | enum iser_data_dir cmd_dir); | |
7306b8fa SG |
670 | void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, |
671 | enum iser_data_dir cmd_dir); | |
49cd5382 | 672 | |
5716af6e SG |
673 | int iser_post_recvl(struct iser_conn *iser_conn); |
674 | int iser_post_recvm(struct iser_conn *iser_conn, int count); | |
6df5a128 SG |
675 | int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, |
676 | bool signal); | |
49cd5382 | 677 | |
2261ec3d | 678 | int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, |
cd88621a SG |
679 | struct iser_data_buf *data, |
680 | enum iser_data_dir iser_dir, | |
681 | enum dma_data_direction dma_dir); | |
74a20780 | 682 | |
9a8b08fa | 683 | void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, |
c6c95ef4 RD |
684 | struct iser_data_buf *data, |
685 | enum dma_data_direction dir); | |
686 | ||
f19624aa OG |
687 | int iser_initialize_task_headers(struct iscsi_task *task, |
688 | struct iser_tx_desc *tx_desc); | |
5716af6e SG |
689 | int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, |
690 | struct iscsi_session *session); | |
f8db651d SG |
691 | int iser_alloc_fmr_pool(struct ib_conn *ib_conn, |
692 | unsigned cmds_max, | |
693 | unsigned int size); | |
a4ee3539 | 694 | void iser_free_fmr_pool(struct ib_conn *ib_conn); |
f8db651d SG |
695 | int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, |
696 | unsigned cmds_max, | |
697 | unsigned int size); | |
a4ee3539 | 698 | void iser_free_fastreg_pool(struct ib_conn *ib_conn); |
0a7a08ad SG |
699 | u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, |
700 | enum iser_data_dir cmd_dir, sector_t *sector); | |
5190cc26 | 701 | struct iser_fr_desc * |
81722909 | 702 | iser_reg_desc_get_fr(struct ib_conn *ib_conn); |
bd8b944e | 703 | void |
81722909 SG |
704 | iser_reg_desc_put_fr(struct ib_conn *ib_conn, |
705 | struct iser_fr_desc *desc); | |
706 | struct iser_fr_desc * | |
707 | iser_reg_desc_get_fmr(struct ib_conn *ib_conn); | |
708 | void | |
709 | iser_reg_desc_put_fmr(struct ib_conn *ib_conn, | |
710 | struct iser_fr_desc *desc); | |
7332bed0 SG |
711 | |
712 | static inline struct ib_send_wr * | |
713 | iser_tx_next_wr(struct iser_tx_desc *tx_desc) | |
714 | { | |
715 | struct ib_send_wr *cur_wr = &tx_desc->wrs[tx_desc->wr_idx]; | |
716 | struct ib_send_wr *last_wr; | |
717 | ||
718 | if (tx_desc->wr_idx) { | |
719 | last_wr = &tx_desc->wrs[tx_desc->wr_idx - 1]; | |
720 | last_wr->next = cur_wr; | |
721 | } | |
722 | tx_desc->wr_idx++; | |
723 | ||
724 | return cur_wr; | |
725 | } | |
726 | ||
49cd5382 | 727 | #endif |