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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 ": " | |
056da88f | 72 | #define DRV_VER "1.5" |
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)) |
25985edc | 101 | /* support up to 512KB in one RDMA */ |
8dfa0876 | 102 | #define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K) |
b7f04513 SP |
103 | #define ISER_DEF_XMIT_CMDS_DEFAULT 512 |
104 | #if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT | |
105 | #define ISER_DEF_XMIT_CMDS_MAX ISCSI_DEF_XMIT_CMDS_MAX | |
106 | #else | |
107 | #define ISER_DEF_XMIT_CMDS_MAX ISER_DEF_XMIT_CMDS_DEFAULT | |
108 | #endif | |
109 | #define ISER_DEF_CMD_PER_LUN ISER_DEF_XMIT_CMDS_MAX | |
49cd5382 OG |
110 | |
111 | /* QP settings */ | |
112 | /* Maximal bounds on received asynchronous PDUs */ | |
113 | #define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */ | |
114 | ||
115 | #define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), * | |
116 | * SCSI_TMFUNC(2), LOGOUT(1) */ | |
117 | ||
b7f04513 | 118 | #define ISER_QP_MAX_RECV_DTOS (ISER_DEF_XMIT_CMDS_MAX) |
bcc60c38 | 119 | |
b7f04513 | 120 | #define ISER_MIN_POSTED_RX (ISER_DEF_XMIT_CMDS_MAX >> 2) |
49cd5382 OG |
121 | |
122 | /* the max TX (send) WR supported by the iSER QP is defined by * | |
123 | * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect * | |
124 | * to have at max for SCSI command. The tx posting & completion handling code * | |
125 | * supports -EAGAIN scheme where tx is suspended till the QP has room for more * | |
126 | * send WR. D=8 comes from 64K/8K */ | |
127 | ||
128 | #define ISER_INFLIGHT_DATAOUTS 8 | |
129 | ||
b7f04513 | 130 | #define ISER_QP_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \ |
49cd5382 OG |
131 | (1 + ISER_INFLIGHT_DATAOUTS) + \ |
132 | ISER_MAX_TX_MISC_PDUS + \ | |
133 | ISER_MAX_RX_MISC_PDUS) | |
134 | ||
6b5a8fb0 AT |
135 | /* Max registration work requests per command */ |
136 | #define ISER_MAX_REG_WR_PER_CMD 5 | |
137 | ||
138 | /* For Signature we don't support DATAOUTs so no need to make room for them */ | |
139 | #define ISER_QP_SIG_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \ | |
140 | (1 + ISER_MAX_REG_WR_PER_CMD) + \ | |
141 | ISER_MAX_TX_MISC_PDUS + \ | |
142 | ISER_MAX_RX_MISC_PDUS) | |
143 | ||
f4641ef7 MT |
144 | #define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr \ |
145 | - ISER_MAX_TX_MISC_PDUS \ | |
146 | - ISER_MAX_RX_MISC_PDUS) / \ | |
147 | (1 + ISER_INFLIGHT_DATAOUTS)) | |
148 | ||
6e6fe2fb | 149 | #define ISER_WC_BATCH_COUNT 16 |
6df5a128 | 150 | #define ISER_SIGNAL_CMD_COUNT 32 |
6e6fe2fb | 151 | |
49cd5382 OG |
152 | #define ISER_VER 0x10 |
153 | #define ISER_WSV 0x08 | |
154 | #define ISER_RSV 0x04 | |
155 | ||
7306b8fa | 156 | #define ISER_FASTREG_LI_WRID 0xffffffffffffffffULL |
ff3dd52d | 157 | #define ISER_BEACON_WRID 0xfffffffffffffffeULL |
db523b8d | 158 | |
cd88621a SG |
159 | /** |
160 | * struct iser_hdr - iSER header | |
161 | * | |
162 | * @flags: flags support (zbva, remote_inv) | |
163 | * @rsvd: reserved | |
164 | * @write_stag: write rkey | |
165 | * @write_va: write virtual address | |
166 | * @reaf_stag: read rkey | |
167 | * @read_va: read virtual address | |
168 | */ | |
49cd5382 OG |
169 | struct iser_hdr { |
170 | u8 flags; | |
171 | u8 rsvd[3]; | |
cd88621a | 172 | __be32 write_stag; |
49cd5382 | 173 | __be64 write_va; |
cd88621a | 174 | __be32 read_stag; |
49cd5382 OG |
175 | __be64 read_va; |
176 | } __attribute__((packed)); | |
177 | ||
8d8399de OG |
178 | |
179 | #define ISER_ZBVA_NOT_SUPPORTED 0x80 | |
180 | #define ISER_SEND_W_INV_NOT_SUPPORTED 0x40 | |
181 | ||
182 | struct iser_cm_hdr { | |
183 | u8 flags; | |
184 | u8 rsvd[3]; | |
185 | } __packed; | |
186 | ||
bcc60c38 OG |
187 | /* Constant PDU lengths calculations */ |
188 | #define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr)) | |
189 | ||
190 | #define ISER_RECV_DATA_SEG_LEN 128 | |
191 | #define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN) | |
192 | #define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN) | |
49cd5382 OG |
193 | |
194 | /* Length of an object name string */ | |
195 | #define ISER_OBJECT_NAME_SIZE 64 | |
196 | ||
5716af6e | 197 | enum iser_conn_state { |
49cd5382 OG |
198 | ISER_CONN_INIT, /* descriptor allocd, no conn */ |
199 | ISER_CONN_PENDING, /* in the process of being established */ | |
200 | ISER_CONN_UP, /* up and running */ | |
201 | ISER_CONN_TERMINATING, /* in the process of being terminated */ | |
202 | ISER_CONN_DOWN, /* shut down */ | |
203 | ISER_CONN_STATES_NUM | |
204 | }; | |
205 | ||
206 | enum iser_task_status { | |
207 | ISER_TASK_STATUS_INIT = 0, | |
208 | ISER_TASK_STATUS_STARTED, | |
209 | ISER_TASK_STATUS_COMPLETED | |
210 | }; | |
211 | ||
212 | enum iser_data_dir { | |
213 | ISER_DIR_IN = 0, /* to initiator */ | |
214 | ISER_DIR_OUT, /* from initiator */ | |
215 | ISER_DIRS_NUM | |
216 | }; | |
217 | ||
cd88621a SG |
218 | /** |
219 | * struct iser_data_buf - iSER data buffer | |
220 | * | |
e3784bd1 | 221 | * @sg: pointer to the sg list |
cd88621a SG |
222 | * @size: num entries of this sg |
223 | * @data_len: total beffer byte len | |
224 | * @dma_nents: returned by dma_map_sg | |
225 | * @copy_buf: allocated copy buf for SGs unaligned | |
226 | * for rdma which are copied | |
e3784bd1 SG |
227 | * @orig_sg: pointer to the original sg list (in case |
228 | * we used a copy) | |
cd88621a SG |
229 | * @sg_single: SG-ified clone of a non SG SC or |
230 | * unaligned SG | |
231 | */ | |
49cd5382 | 232 | struct iser_data_buf { |
e3784bd1 | 233 | struct scatterlist *sg; |
cd88621a SG |
234 | unsigned int size; |
235 | unsigned long data_len; | |
236 | unsigned int dma_nents; | |
e3784bd1 | 237 | struct scatterlist *orig_sg; |
cd88621a SG |
238 | char *copy_buf; |
239 | struct scatterlist sg_single; | |
49cd5382 OG |
240 | }; |
241 | ||
242 | /* fwd declarations */ | |
243 | struct iser_device; | |
2261ec3d | 244 | struct iscsi_iser_task; |
412eeafa | 245 | struct iscsi_endpoint; |
49cd5382 | 246 | |
cd88621a SG |
247 | /** |
248 | * struct iser_mem_reg - iSER memory registration info | |
249 | * | |
250 | * @lkey: MR local key | |
251 | * @rkey: MR remote key | |
252 | * @va: MR start address (buffer va) | |
253 | * @len: MR length | |
254 | * @mem_h: pointer to registration context (FMR/Fastreg) | |
cd88621a | 255 | */ |
49cd5382 OG |
256 | struct iser_mem_reg { |
257 | u32 lkey; | |
258 | u32 rkey; | |
259 | u64 va; | |
260 | u64 len; | |
261 | void *mem_h; | |
262 | }; | |
263 | ||
49cd5382 | 264 | enum iser_desc_type { |
49cd5382 OG |
265 | ISCSI_TX_CONTROL , |
266 | ISCSI_TX_SCSI_COMMAND, | |
267 | ISCSI_TX_DATAOUT | |
268 | }; | |
269 | ||
cd88621a SG |
270 | /** |
271 | * struct iser_tx_desc - iSER TX descriptor (for send wr_id) | |
272 | * | |
273 | * @iser_header: iser header | |
274 | * @iscsi_header: iscsi header | |
275 | * @type: command/control/dataout | |
276 | * @dam_addr: header buffer dma_address | |
277 | * @tx_sg: sg[0] points to iser/iscsi headers | |
278 | * sg[1] optionally points to either of immediate data | |
279 | * unsolicited data-out or control | |
280 | * @num_sge: number sges used on this TX task | |
281 | */ | |
f19624aa | 282 | struct iser_tx_desc { |
49cd5382 OG |
283 | struct iser_hdr iser_header; |
284 | struct iscsi_hdr iscsi_header; | |
49cd5382 | 285 | enum iser_desc_type type; |
f19624aa | 286 | u64 dma_addr; |
f19624aa OG |
287 | struct ib_sge tx_sg[2]; |
288 | int num_sge; | |
49cd5382 OG |
289 | }; |
290 | ||
bcc60c38 OG |
291 | #define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \ |
292 | sizeof(u64) + sizeof(struct ib_sge))) | |
cd88621a SG |
293 | /** |
294 | * struct iser_rx_desc - iSER RX descriptor (for recv wr_id) | |
295 | * | |
296 | * @iser_header: iser header | |
297 | * @iscsi_header: iscsi header | |
298 | * @data: received data segment | |
299 | * @dma_addr: receive buffer dma address | |
300 | * @rx_sg: ib_sge of receive buffer | |
301 | * @pad: for sense data TODO: Modify to maximum sense length supported | |
302 | */ | |
bcc60c38 OG |
303 | struct iser_rx_desc { |
304 | struct iser_hdr iser_header; | |
305 | struct iscsi_hdr iscsi_header; | |
306 | char data[ISER_RECV_DATA_SEG_LEN]; | |
307 | u64 dma_addr; | |
308 | struct ib_sge rx_sg; | |
309 | char pad[ISER_RX_PAD_SIZE]; | |
310 | } __attribute__((packed)); | |
311 | ||
b4e155ff | 312 | struct iser_conn; |
a4ee3539 | 313 | struct ib_conn; |
b4e155ff SG |
314 | struct iscsi_iser_task; |
315 | ||
bf175540 SG |
316 | /** |
317 | * struct iser_comp - iSER completion context | |
318 | * | |
319 | * @device: pointer to device handle | |
6aabfa76 | 320 | * @cq: completion queue |
6e6fe2fb | 321 | * @wcs: work completion array |
bf175540 SG |
322 | * @tasklet: Tasklet handle |
323 | * @active_qps: Number of active QPs attached | |
324 | * to completion context | |
325 | */ | |
326 | struct iser_comp { | |
327 | struct iser_device *device; | |
6aabfa76 | 328 | struct ib_cq *cq; |
6e6fe2fb | 329 | struct ib_wc wcs[ISER_WC_BATCH_COUNT]; |
bf175540 SG |
330 | struct tasklet_struct tasklet; |
331 | int active_qps; | |
332 | }; | |
333 | ||
cd88621a SG |
334 | /** |
335 | * struct iser_device - iSER device handle | |
336 | * | |
337 | * @ib_device: RDMA device | |
338 | * @pd: Protection Domain for this device | |
339 | * @dev_attr: Device attributes container | |
340 | * @mr: Global DMA memory region | |
341 | * @event_handler: IB events handle routine | |
342 | * @ig_list: entry in devices list | |
343 | * @refcount: Reference counter, dominated by open iser connections | |
344 | * @comps_used: Number of completion contexts used, Min between online | |
345 | * cpus and device max completion vectors | |
346 | * @comps: Dinamically allocated array of completion handlers | |
347 | * Memory registration pool Function pointers (FMR or Fastreg): | |
348 | * @iser_alloc_rdma_reg_res: Allocation of memory regions pool | |
349 | * @iser_free_rdma_reg_res: Free of memory regions pool | |
350 | * @iser_reg_rdma_mem: Memory registration routine | |
351 | * @iser_unreg_rdma_mem: Memory deregistration routine | |
352 | */ | |
49cd5382 OG |
353 | struct iser_device { |
354 | struct ib_device *ib_device; | |
355 | struct ib_pd *pd; | |
65198d6b | 356 | struct ib_device_attr dev_attr; |
49cd5382 | 357 | struct ib_mr *mr; |
2110f9bf | 358 | struct ib_event_handler event_handler; |
cd88621a | 359 | struct list_head ig_list; |
49cd5382 | 360 | int refcount; |
bf175540 | 361 | int comps_used; |
da64bdb2 | 362 | struct iser_comp *comps; |
a4ee3539 | 363 | int (*iser_alloc_rdma_reg_res)(struct ib_conn *ib_conn, |
b4e155ff | 364 | unsigned cmds_max); |
a4ee3539 | 365 | void (*iser_free_rdma_reg_res)(struct ib_conn *ib_conn); |
b4e155ff SG |
366 | int (*iser_reg_rdma_mem)(struct iscsi_iser_task *iser_task, |
367 | enum iser_data_dir cmd_dir); | |
368 | void (*iser_unreg_rdma_mem)(struct iscsi_iser_task *iser_task, | |
369 | enum iser_data_dir cmd_dir); | |
49cd5382 OG |
370 | }; |
371 | ||
177e31bd SG |
372 | #define ISER_CHECK_GUARD 0xc0 |
373 | #define ISER_CHECK_REFTAG 0x0f | |
374 | #define ISER_CHECK_APPTAG 0x30 | |
375 | ||
73bc06b7 | 376 | enum iser_reg_indicator { |
6b5a8fb0 AT |
377 | ISER_DATA_KEY_VALID = 1 << 0, |
378 | ISER_PROT_KEY_VALID = 1 << 1, | |
379 | ISER_SIG_KEY_VALID = 1 << 2, | |
380 | ISER_FASTREG_PROTECTED = 1 << 3, | |
381 | }; | |
382 | ||
cd88621a SG |
383 | /** |
384 | * struct iser_pi_context - Protection information context | |
385 | * | |
386 | * @prot_mr: protection memory region | |
387 | * @prot_frpl: protection fastreg page list | |
388 | * @sig_mr: signature feature enabled memory region | |
389 | */ | |
6b5a8fb0 AT |
390 | struct iser_pi_context { |
391 | struct ib_mr *prot_mr; | |
392 | struct ib_fast_reg_page_list *prot_frpl; | |
393 | struct ib_mr *sig_mr; | |
73bc06b7 SG |
394 | }; |
395 | ||
cd88621a SG |
396 | /** |
397 | * struct fast_reg_descriptor - Fast registration descriptor | |
398 | * | |
399 | * @list: entry in connection fastreg pool | |
400 | * @data_mr: data memory region | |
401 | * @data_frpl: data fastreg page list | |
402 | * @pi_ctx: protection information context | |
403 | * @reg_indicators: fast registration indicators | |
404 | */ | |
5587856c SG |
405 | struct fast_reg_descriptor { |
406 | struct list_head list; | |
5587856c SG |
407 | struct ib_mr *data_mr; |
408 | struct ib_fast_reg_page_list *data_frpl; | |
6b5a8fb0 | 409 | struct iser_pi_context *pi_ctx; |
73bc06b7 | 410 | u8 reg_indicators; |
5587856c SG |
411 | }; |
412 | ||
a4ee3539 SG |
413 | /** |
414 | * struct ib_conn - Infiniband related objects | |
415 | * | |
416 | * @cma_id: rdma_cm connection maneger handle | |
417 | * @qp: Connection Queue-pair | |
418 | * @post_recv_buf_count: post receive counter | |
6ec9d4d2 | 419 | * @sig_count: send work request signal count |
a4ee3539 SG |
420 | * @rx_wr: receive work request for batch posts |
421 | * @device: reference to iser device | |
bf175540 | 422 | * @comp: iser completion context |
a4ee3539 | 423 | * @pi_support: Indicate device T10-PI support |
ff3dd52d | 424 | * @beacon: beacon send wr to signal all flush errors were drained |
6aabfa76 | 425 | * @flush_comp: completes when all connection completions consumed |
a4ee3539 SG |
426 | * @lock: protects fmr/fastreg pool |
427 | * @union.fmr: | |
428 | * @pool: FMR pool for fast registrations | |
429 | * @page_vec: page vector to hold mapped commands pages | |
430 | * used for registration | |
431 | * @union.fastreg: | |
432 | * @pool: Fast registration descriptors pool for fast | |
433 | * registrations | |
434 | * @pool_size: Size of pool | |
435 | */ | |
436 | struct ib_conn { | |
437 | struct rdma_cm_id *cma_id; | |
438 | struct ib_qp *qp; | |
439 | int post_recv_buf_count; | |
6ec9d4d2 | 440 | u8 sig_count; |
a4ee3539 SG |
441 | struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX]; |
442 | struct iser_device *device; | |
bf175540 | 443 | struct iser_comp *comp; |
a4ee3539 | 444 | bool pi_support; |
ff3dd52d | 445 | struct ib_send_wr beacon; |
6aabfa76 | 446 | struct completion flush_comp; |
a4ee3539 SG |
447 | spinlock_t lock; |
448 | union { | |
449 | struct { | |
450 | struct ib_fmr_pool *pool; | |
451 | struct iser_page_vec *page_vec; | |
452 | } fmr; | |
453 | struct { | |
454 | struct list_head pool; | |
455 | int pool_size; | |
456 | } fastreg; | |
457 | }; | |
458 | }; | |
459 | ||
cd88621a SG |
460 | /** |
461 | * struct iser_conn - iSER connection context | |
462 | * | |
463 | * @ib_conn: connection RDMA resources | |
464 | * @iscsi_conn: link to matching iscsi connection | |
465 | * @ep: transport handle | |
466 | * @state: connection logical state | |
467 | * @qp_max_recv_dtos: maximum number of data outs, corresponds | |
468 | * to max number of post recvs | |
469 | * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1) | |
470 | * @min_posted_rx: (qp_max_recv_dtos >> 2) | |
f4641ef7 | 471 | * @max_cmds: maximum cmds allowed for this connection |
cd88621a SG |
472 | * @name: connection peer portal |
473 | * @release_work: deffered work for release job | |
474 | * @state_mutex: protects iser onnection state | |
475 | * @stop_completion: conn_stop completion | |
476 | * @ib_completion: RDMA cleanup completion | |
477 | * @up_completion: connection establishment completed | |
478 | * (state is ISER_CONN_UP) | |
479 | * @conn_list: entry in ig conn list | |
480 | * @login_buf: login data buffer (stores login parameters) | |
481 | * @login_req_buf: login request buffer | |
482 | * @login_req_dma: login request buffer dma address | |
483 | * @login_resp_buf: login response buffer | |
484 | * @login_resp_dma: login response buffer dma address | |
485 | * @rx_desc_head: head of rx_descs cyclic buffer | |
486 | * @rx_descs: rx buffers array (cyclic buffer) | |
487 | * @num_rx_descs: number of rx descriptors | |
488 | */ | |
49cd5382 | 489 | struct iser_conn { |
a4ee3539 | 490 | struct ib_conn ib_conn; |
4667f5df | 491 | struct iscsi_conn *iscsi_conn; |
412eeafa | 492 | struct iscsi_endpoint *ep; |
cd88621a SG |
493 | enum iser_conn_state state; |
494 | unsigned qp_max_recv_dtos; | |
495 | unsigned qp_max_recv_dtos_mask; | |
496 | unsigned min_posted_rx; | |
f4641ef7 | 497 | u16 max_cmds; |
49cd5382 | 498 | char name[ISER_OBJECT_NAME_SIZE]; |
b73c3ada | 499 | struct work_struct release_work; |
504130c0 | 500 | struct mutex state_mutex; |
c47a3c9e SG |
501 | struct completion stop_completion; |
502 | struct completion ib_completion; | |
9a6d3234 | 503 | struct completion up_completion; |
cd88621a | 504 | struct list_head conn_list; |
bcc60c38 OG |
505 | |
506 | char *login_buf; | |
2c4ce609 OG |
507 | char *login_req_buf, *login_resp_buf; |
508 | u64 login_req_dma, login_resp_dma; | |
bcc60c38 OG |
509 | unsigned int rx_desc_head; |
510 | struct iser_rx_desc *rx_descs; | |
6aabfa76 | 511 | u32 num_rx_descs; |
49cd5382 OG |
512 | }; |
513 | ||
cd88621a SG |
514 | /** |
515 | * struct iscsi_iser_task - iser task context | |
516 | * | |
517 | * @desc: TX descriptor | |
518 | * @iser_conn: link to iser connection | |
519 | * @status: current task status | |
520 | * @sc: link to scsi command | |
521 | * @command_sent: indicate if command was sent | |
522 | * @dir: iser data direction | |
b130eded | 523 | * @rdma_reg: task rdma registration desc |
cd88621a | 524 | * @data: iser data buffer desc |
cd88621a | 525 | * @prot: iser protection buffer desc |
cd88621a | 526 | */ |
2261ec3d | 527 | struct iscsi_iser_task { |
f19624aa | 528 | struct iser_tx_desc desc; |
5716af6e | 529 | struct iser_conn *iser_conn; |
49cd5382 | 530 | enum iser_task_status status; |
177e31bd | 531 | struct scsi_cmnd *sc; |
cd88621a SG |
532 | int command_sent; |
533 | int dir[ISER_DIRS_NUM]; | |
b130eded | 534 | struct iser_mem_reg rdma_reg[ISER_DIRS_NUM]; |
cd88621a | 535 | struct iser_data_buf data[ISER_DIRS_NUM]; |
cd88621a | 536 | struct iser_data_buf prot[ISER_DIRS_NUM]; |
49cd5382 OG |
537 | }; |
538 | ||
539 | struct iser_page_vec { | |
540 | u64 *pages; | |
541 | int length; | |
542 | int offset; | |
543 | int data_size; | |
544 | }; | |
545 | ||
cd88621a SG |
546 | /** |
547 | * struct iser_global: iSER global context | |
548 | * | |
549 | * @device_list_mutex: protects device_list | |
550 | * @device_list: iser devices global list | |
551 | * @connlist_mutex: protects connlist | |
552 | * @connlist: iser connections global list | |
553 | * @desc_cache: kmem cache for tx dataout | |
554 | */ | |
49cd5382 | 555 | struct iser_global { |
cd88621a SG |
556 | struct mutex device_list_mutex; |
557 | struct list_head device_list; | |
49cd5382 | 558 | struct mutex connlist_mutex; |
cd88621a | 559 | struct list_head connlist; |
e54f8188 | 560 | struct kmem_cache *desc_cache; |
49cd5382 OG |
561 | }; |
562 | ||
563 | extern struct iser_global ig; | |
564 | extern int iser_debug_level; | |
7f733847 AT |
565 | extern bool iser_pi_enable; |
566 | extern int iser_pi_guard; | |
49cd5382 | 567 | |
2747fdb2 | 568 | int iser_send_control(struct iscsi_conn *conn, |
2261ec3d | 569 | struct iscsi_task *task); |
49cd5382 | 570 | |
2747fdb2 | 571 | int iser_send_command(struct iscsi_conn *conn, |
2261ec3d | 572 | struct iscsi_task *task); |
49cd5382 | 573 | |
2747fdb2 | 574 | int iser_send_data_out(struct iscsi_conn *conn, |
2261ec3d | 575 | struct iscsi_task *task, |
2747fdb2 | 576 | struct iscsi_data *hdr); |
49cd5382 OG |
577 | |
578 | void iscsi_iser_recv(struct iscsi_conn *conn, | |
cd88621a SG |
579 | struct iscsi_hdr *hdr, |
580 | char *rx_data, | |
581 | int rx_data_len); | |
49cd5382 | 582 | |
5716af6e | 583 | void iser_conn_init(struct iser_conn *iser_conn); |
49cd5382 | 584 | |
5716af6e | 585 | void iser_conn_release(struct iser_conn *iser_conn); |
49cd5382 | 586 | |
c47a3c9e | 587 | int iser_conn_terminate(struct iser_conn *iser_conn); |
49cd5382 | 588 | |
b73c3ada AN |
589 | void iser_release_work(struct work_struct *work); |
590 | ||
bcc60c38 | 591 | void iser_rcv_completion(struct iser_rx_desc *desc, |
cd88621a | 592 | unsigned long dto_xfer_len, |
a4ee3539 | 593 | struct ib_conn *ib_conn); |
49cd5382 | 594 | |
5716af6e | 595 | void iser_snd_completion(struct iser_tx_desc *desc, |
a4ee3539 | 596 | struct ib_conn *ib_conn); |
49cd5382 | 597 | |
2261ec3d | 598 | void iser_task_rdma_init(struct iscsi_iser_task *task); |
49cd5382 | 599 | |
2261ec3d | 600 | void iser_task_rdma_finalize(struct iscsi_iser_task *task); |
49cd5382 | 601 | |
5716af6e | 602 | void iser_free_rx_descriptors(struct iser_conn *iser_conn); |
bcc60c38 | 603 | |
9a8b08fa SG |
604 | void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, |
605 | struct iser_data_buf *mem, | |
9a8b08fa | 606 | enum iser_data_dir cmd_dir); |
49cd5382 | 607 | |
e657571b SG |
608 | int iser_reg_rdma_mem_fmr(struct iscsi_iser_task *task, |
609 | enum iser_data_dir cmd_dir); | |
7306b8fa SG |
610 | int iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *task, |
611 | enum iser_data_dir cmd_dir); | |
49cd5382 | 612 | |
cd88621a SG |
613 | int iser_connect(struct iser_conn *iser_conn, |
614 | struct sockaddr *src_addr, | |
615 | struct sockaddr *dst_addr, | |
616 | int non_blocking); | |
49cd5382 | 617 | |
e657571b SG |
618 | void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task, |
619 | enum iser_data_dir cmd_dir); | |
7306b8fa SG |
620 | void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, |
621 | enum iser_data_dir cmd_dir); | |
49cd5382 | 622 | |
5716af6e SG |
623 | int iser_post_recvl(struct iser_conn *iser_conn); |
624 | int iser_post_recvm(struct iser_conn *iser_conn, int count); | |
6df5a128 SG |
625 | int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, |
626 | bool signal); | |
49cd5382 | 627 | |
2261ec3d | 628 | int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, |
cd88621a SG |
629 | struct iser_data_buf *data, |
630 | enum iser_data_dir iser_dir, | |
631 | enum dma_data_direction dma_dir); | |
74a20780 | 632 | |
9a8b08fa | 633 | void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, |
c6c95ef4 RD |
634 | struct iser_data_buf *data, |
635 | enum dma_data_direction dir); | |
636 | ||
f19624aa OG |
637 | int iser_initialize_task_headers(struct iscsi_task *task, |
638 | struct iser_tx_desc *tx_desc); | |
5716af6e SG |
639 | int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, |
640 | struct iscsi_session *session); | |
a4ee3539 SG |
641 | int iser_create_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max); |
642 | void iser_free_fmr_pool(struct ib_conn *ib_conn); | |
643 | int iser_create_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max); | |
644 | void iser_free_fastreg_pool(struct ib_conn *ib_conn); | |
0a7a08ad SG |
645 | u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, |
646 | enum iser_data_dir cmd_dir, sector_t *sector); | |
bd8b944e SG |
647 | struct fast_reg_descriptor * |
648 | iser_reg_desc_get(struct ib_conn *ib_conn); | |
649 | void | |
650 | iser_reg_desc_put(struct ib_conn *ib_conn, | |
651 | struct fast_reg_descriptor *desc); | |
49cd5382 | 652 | #endif |