2 * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
3 * Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>.
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/slab.h>
38 #include <linux/err.h>
39 #include <linux/ctype.h>
40 #include <linux/kthread.h>
41 #include <linux/string.h>
42 #include <linux/delay.h>
43 #include <linux/atomic.h>
44 #include <scsi/scsi_proto.h>
45 #include <scsi/scsi_tcq.h>
46 #include <target/target_core_base.h>
47 #include <target/target_core_fabric.h>
50 /* Name of this kernel module. */
51 #define DRV_NAME "ib_srpt"
52 #define DRV_VERSION "2.0.0"
53 #define DRV_RELDATE "2011-02-14"
55 #define SRPT_ID_STRING "Linux SRP target"
58 #define pr_fmt(fmt) DRV_NAME " " fmt
60 MODULE_AUTHOR("Vu Pham and Bart Van Assche");
61 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target "
62 "v" DRV_VERSION
" (" DRV_RELDATE
")");
63 MODULE_LICENSE("Dual BSD/GPL");
69 static u64 srpt_service_guid
;
70 static DEFINE_SPINLOCK(srpt_dev_lock
); /* Protects srpt_dev_list. */
71 static LIST_HEAD(srpt_dev_list
); /* List of srpt_device structures. */
73 static unsigned srp_max_req_size
= DEFAULT_MAX_REQ_SIZE
;
74 module_param(srp_max_req_size
, int, 0444);
75 MODULE_PARM_DESC(srp_max_req_size
,
76 "Maximum size of SRP request messages in bytes.");
78 static int srpt_srq_size
= DEFAULT_SRPT_SRQ_SIZE
;
79 module_param(srpt_srq_size
, int, 0444);
80 MODULE_PARM_DESC(srpt_srq_size
,
81 "Shared receive queue (SRQ) size.");
83 static int srpt_get_u64_x(char *buffer
, struct kernel_param
*kp
)
85 return sprintf(buffer
, "0x%016llx", *(u64
*)kp
->arg
);
87 module_param_call(srpt_service_guid
, NULL
, srpt_get_u64_x
, &srpt_service_guid
,
89 MODULE_PARM_DESC(srpt_service_guid
,
90 "Using this value for ioc_guid, id_ext, and cm_listen_id"
91 " instead of using the node_guid of the first HCA.");
93 static struct ib_client srpt_client
;
94 static void srpt_release_cmd(struct se_cmd
*se_cmd
);
95 static void srpt_free_ch(struct kref
*kref
);
96 static int srpt_queue_status(struct se_cmd
*cmd
);
97 static void srpt_recv_done(struct ib_cq
*cq
, struct ib_wc
*wc
);
98 static void srpt_send_done(struct ib_cq
*cq
, struct ib_wc
*wc
);
99 static void srpt_process_wait_list(struct srpt_rdma_ch
*ch
);
102 * The only allowed channel state changes are those that change the channel
103 * state into a state with a higher numerical value. Hence the new > prev test.
105 static bool srpt_set_ch_state(struct srpt_rdma_ch
*ch
, enum rdma_ch_state
new)
108 enum rdma_ch_state prev
;
109 bool changed
= false;
111 spin_lock_irqsave(&ch
->spinlock
, flags
);
117 spin_unlock_irqrestore(&ch
->spinlock
, flags
);
123 * srpt_event_handler() - Asynchronous IB event callback function.
125 * Callback function called by the InfiniBand core when an asynchronous IB
126 * event occurs. This callback may occur in interrupt context. See also
127 * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand
128 * Architecture Specification.
130 static void srpt_event_handler(struct ib_event_handler
*handler
,
131 struct ib_event
*event
)
133 struct srpt_device
*sdev
;
134 struct srpt_port
*sport
;
136 sdev
= ib_get_client_data(event
->device
, &srpt_client
);
137 if (!sdev
|| sdev
->device
!= event
->device
)
140 pr_debug("ASYNC event= %d on device= %s\n", event
->event
,
143 switch (event
->event
) {
144 case IB_EVENT_PORT_ERR
:
145 if (event
->element
.port_num
<= sdev
->device
->phys_port_cnt
) {
146 sport
= &sdev
->port
[event
->element
.port_num
- 1];
151 case IB_EVENT_PORT_ACTIVE
:
152 case IB_EVENT_LID_CHANGE
:
153 case IB_EVENT_PKEY_CHANGE
:
154 case IB_EVENT_SM_CHANGE
:
155 case IB_EVENT_CLIENT_REREGISTER
:
156 case IB_EVENT_GID_CHANGE
:
157 /* Refresh port data asynchronously. */
158 if (event
->element
.port_num
<= sdev
->device
->phys_port_cnt
) {
159 sport
= &sdev
->port
[event
->element
.port_num
- 1];
160 if (!sport
->lid
&& !sport
->sm_lid
)
161 schedule_work(&sport
->work
);
165 pr_err("received unrecognized IB event %d\n",
172 * srpt_srq_event() - SRQ event callback function.
174 static void srpt_srq_event(struct ib_event
*event
, void *ctx
)
176 pr_info("SRQ event %d\n", event
->event
);
179 static const char *get_ch_state_name(enum rdma_ch_state s
)
186 case CH_DISCONNECTING
:
187 return "disconnecting";
190 case CH_DISCONNECTED
:
191 return "disconnected";
197 * srpt_qp_event() - QP event callback function.
199 static void srpt_qp_event(struct ib_event
*event
, struct srpt_rdma_ch
*ch
)
201 pr_debug("QP event %d on cm_id=%p sess_name=%s state=%d\n",
202 event
->event
, ch
->cm_id
, ch
->sess_name
, ch
->state
);
204 switch (event
->event
) {
205 case IB_EVENT_COMM_EST
:
206 ib_cm_notify(ch
->cm_id
, event
->event
);
208 case IB_EVENT_QP_LAST_WQE_REACHED
:
209 pr_debug("%s-%d, state %s: received Last WQE event.\n",
210 ch
->sess_name
, ch
->qp
->qp_num
,
211 get_ch_state_name(ch
->state
));
214 pr_err("received unrecognized IB QP event %d\n", event
->event
);
220 * srpt_set_ioc() - Helper function for initializing an IOUnitInfo structure.
222 * @slot: one-based slot number.
223 * @value: four-bit value.
225 * Copies the lowest four bits of value in element slot of the array of four
226 * bit elements called c_list (controller list). The index slot is one-based.
228 static void srpt_set_ioc(u8
*c_list
, u32 slot
, u8 value
)
235 tmp
= c_list
[id
] & 0xf;
236 c_list
[id
] = (value
<< 4) | tmp
;
238 tmp
= c_list
[id
] & 0xf0;
239 c_list
[id
] = (value
& 0xf) | tmp
;
244 * srpt_get_class_port_info() - Copy ClassPortInfo to a management datagram.
246 * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture
249 static void srpt_get_class_port_info(struct ib_dm_mad
*mad
)
251 struct ib_class_port_info
*cif
;
253 cif
= (struct ib_class_port_info
*)mad
->data
;
254 memset(cif
, 0, sizeof(*cif
));
255 cif
->base_version
= 1;
256 cif
->class_version
= 1;
258 ib_set_cpi_resp_time(cif
, 20);
259 mad
->mad_hdr
.status
= 0;
263 * srpt_get_iou() - Write IOUnitInfo to a management datagram.
265 * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
266 * Specification. See also section B.7, table B.6 in the SRP r16a document.
268 static void srpt_get_iou(struct ib_dm_mad
*mad
)
270 struct ib_dm_iou_info
*ioui
;
274 ioui
= (struct ib_dm_iou_info
*)mad
->data
;
275 ioui
->change_id
= cpu_to_be16(1);
276 ioui
->max_controllers
= 16;
278 /* set present for slot 1 and empty for the rest */
279 srpt_set_ioc(ioui
->controller_list
, 1, 1);
280 for (i
= 1, slot
= 2; i
< 16; i
++, slot
++)
281 srpt_set_ioc(ioui
->controller_list
, slot
, 0);
283 mad
->mad_hdr
.status
= 0;
287 * srpt_get_ioc() - Write IOControllerprofile to a management datagram.
289 * See also section 16.3.3.4 IOControllerProfile in the InfiniBand
290 * Architecture Specification. See also section B.7, table B.7 in the SRP
293 static void srpt_get_ioc(struct srpt_port
*sport
, u32 slot
,
294 struct ib_dm_mad
*mad
)
296 struct srpt_device
*sdev
= sport
->sdev
;
297 struct ib_dm_ioc_profile
*iocp
;
299 iocp
= (struct ib_dm_ioc_profile
*)mad
->data
;
301 if (!slot
|| slot
> 16) {
303 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD
);
309 = cpu_to_be16(DM_MAD_STATUS_NO_IOC
);
313 memset(iocp
, 0, sizeof(*iocp
));
314 strcpy(iocp
->id_string
, SRPT_ID_STRING
);
315 iocp
->guid
= cpu_to_be64(srpt_service_guid
);
316 iocp
->vendor_id
= cpu_to_be32(sdev
->device
->attrs
.vendor_id
);
317 iocp
->device_id
= cpu_to_be32(sdev
->device
->attrs
.vendor_part_id
);
318 iocp
->device_version
= cpu_to_be16(sdev
->device
->attrs
.hw_ver
);
319 iocp
->subsys_vendor_id
= cpu_to_be32(sdev
->device
->attrs
.vendor_id
);
320 iocp
->subsys_device_id
= 0x0;
321 iocp
->io_class
= cpu_to_be16(SRP_REV16A_IB_IO_CLASS
);
322 iocp
->io_subclass
= cpu_to_be16(SRP_IO_SUBCLASS
);
323 iocp
->protocol
= cpu_to_be16(SRP_PROTOCOL
);
324 iocp
->protocol_version
= cpu_to_be16(SRP_PROTOCOL_VERSION
);
325 iocp
->send_queue_depth
= cpu_to_be16(sdev
->srq_size
);
326 iocp
->rdma_read_depth
= 4;
327 iocp
->send_size
= cpu_to_be32(srp_max_req_size
);
328 iocp
->rdma_size
= cpu_to_be32(min(sport
->port_attrib
.srp_max_rdma_size
,
330 iocp
->num_svc_entries
= 1;
331 iocp
->op_cap_mask
= SRP_SEND_TO_IOC
| SRP_SEND_FROM_IOC
|
332 SRP_RDMA_READ_FROM_IOC
| SRP_RDMA_WRITE_FROM_IOC
;
334 mad
->mad_hdr
.status
= 0;
338 * srpt_get_svc_entries() - Write ServiceEntries to a management datagram.
340 * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
341 * Specification. See also section B.7, table B.8 in the SRP r16a document.
343 static void srpt_get_svc_entries(u64 ioc_guid
,
344 u16 slot
, u8 hi
, u8 lo
, struct ib_dm_mad
*mad
)
346 struct ib_dm_svc_entries
*svc_entries
;
350 if (!slot
|| slot
> 16) {
352 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD
);
356 if (slot
> 2 || lo
> hi
|| hi
> 1) {
358 = cpu_to_be16(DM_MAD_STATUS_NO_IOC
);
362 svc_entries
= (struct ib_dm_svc_entries
*)mad
->data
;
363 memset(svc_entries
, 0, sizeof(*svc_entries
));
364 svc_entries
->service_entries
[0].id
= cpu_to_be64(ioc_guid
);
365 snprintf(svc_entries
->service_entries
[0].name
,
366 sizeof(svc_entries
->service_entries
[0].name
),
368 SRP_SERVICE_NAME_PREFIX
,
371 mad
->mad_hdr
.status
= 0;
375 * srpt_mgmt_method_get() - Process a received management datagram.
376 * @sp: source port through which the MAD has been received.
377 * @rq_mad: received MAD.
378 * @rsp_mad: response MAD.
380 static void srpt_mgmt_method_get(struct srpt_port
*sp
, struct ib_mad
*rq_mad
,
381 struct ib_dm_mad
*rsp_mad
)
387 attr_id
= be16_to_cpu(rq_mad
->mad_hdr
.attr_id
);
389 case DM_ATTR_CLASS_PORT_INFO
:
390 srpt_get_class_port_info(rsp_mad
);
392 case DM_ATTR_IOU_INFO
:
393 srpt_get_iou(rsp_mad
);
395 case DM_ATTR_IOC_PROFILE
:
396 slot
= be32_to_cpu(rq_mad
->mad_hdr
.attr_mod
);
397 srpt_get_ioc(sp
, slot
, rsp_mad
);
399 case DM_ATTR_SVC_ENTRIES
:
400 slot
= be32_to_cpu(rq_mad
->mad_hdr
.attr_mod
);
401 hi
= (u8
) ((slot
>> 8) & 0xff);
402 lo
= (u8
) (slot
& 0xff);
403 slot
= (u16
) ((slot
>> 16) & 0xffff);
404 srpt_get_svc_entries(srpt_service_guid
,
405 slot
, hi
, lo
, rsp_mad
);
408 rsp_mad
->mad_hdr
.status
=
409 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR
);
415 * srpt_mad_send_handler() - Post MAD-send callback function.
417 static void srpt_mad_send_handler(struct ib_mad_agent
*mad_agent
,
418 struct ib_mad_send_wc
*mad_wc
)
420 ib_destroy_ah(mad_wc
->send_buf
->ah
);
421 ib_free_send_mad(mad_wc
->send_buf
);
425 * srpt_mad_recv_handler() - MAD reception callback function.
427 static void srpt_mad_recv_handler(struct ib_mad_agent
*mad_agent
,
428 struct ib_mad_send_buf
*send_buf
,
429 struct ib_mad_recv_wc
*mad_wc
)
431 struct srpt_port
*sport
= (struct srpt_port
*)mad_agent
->context
;
433 struct ib_mad_send_buf
*rsp
;
434 struct ib_dm_mad
*dm_mad
;
436 if (!mad_wc
|| !mad_wc
->recv_buf
.mad
)
439 ah
= ib_create_ah_from_wc(mad_agent
->qp
->pd
, mad_wc
->wc
,
440 mad_wc
->recv_buf
.grh
, mad_agent
->port_num
);
444 BUILD_BUG_ON(offsetof(struct ib_dm_mad
, data
) != IB_MGMT_DEVICE_HDR
);
446 rsp
= ib_create_send_mad(mad_agent
, mad_wc
->wc
->src_qp
,
447 mad_wc
->wc
->pkey_index
, 0,
448 IB_MGMT_DEVICE_HDR
, IB_MGMT_DEVICE_DATA
,
450 IB_MGMT_BASE_VERSION
);
457 memcpy(dm_mad
, mad_wc
->recv_buf
.mad
, sizeof(*dm_mad
));
458 dm_mad
->mad_hdr
.method
= IB_MGMT_METHOD_GET_RESP
;
459 dm_mad
->mad_hdr
.status
= 0;
461 switch (mad_wc
->recv_buf
.mad
->mad_hdr
.method
) {
462 case IB_MGMT_METHOD_GET
:
463 srpt_mgmt_method_get(sport
, mad_wc
->recv_buf
.mad
, dm_mad
);
465 case IB_MGMT_METHOD_SET
:
466 dm_mad
->mad_hdr
.status
=
467 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR
);
470 dm_mad
->mad_hdr
.status
=
471 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD
);
475 if (!ib_post_send_mad(rsp
, NULL
)) {
476 ib_free_recv_mad(mad_wc
);
477 /* will destroy_ah & free_send_mad in send completion */
481 ib_free_send_mad(rsp
);
486 ib_free_recv_mad(mad_wc
);
490 * srpt_refresh_port() - Configure a HCA port.
492 * Enable InfiniBand management datagram processing, update the cached sm_lid,
493 * lid and gid values, and register a callback function for processing MADs
494 * on the specified port.
496 * Note: It is safe to call this function more than once for the same port.
498 static int srpt_refresh_port(struct srpt_port
*sport
)
500 struct ib_mad_reg_req reg_req
;
501 struct ib_port_modify port_modify
;
502 struct ib_port_attr port_attr
;
506 memset(&port_modify
, 0, sizeof(port_modify
));
507 port_modify
.set_port_cap_mask
= IB_PORT_DEVICE_MGMT_SUP
;
508 port_modify
.clr_port_cap_mask
= 0;
510 ret
= ib_modify_port(sport
->sdev
->device
, sport
->port
, 0, &port_modify
);
514 ret
= ib_query_port(sport
->sdev
->device
, sport
->port
, &port_attr
);
518 sport
->sm_lid
= port_attr
.sm_lid
;
519 sport
->lid
= port_attr
.lid
;
521 ret
= ib_query_gid(sport
->sdev
->device
, sport
->port
, 0, &sport
->gid
,
526 sport
->port_guid_wwn
.priv
= sport
;
527 guid
= (__be16
*)&sport
->gid
.global
.interface_id
;
528 snprintf(sport
->port_guid
, sizeof(sport
->port_guid
),
529 "%04x:%04x:%04x:%04x",
530 be16_to_cpu(guid
[0]), be16_to_cpu(guid
[1]),
531 be16_to_cpu(guid
[2]), be16_to_cpu(guid
[3]));
532 sport
->port_gid_wwn
.priv
= sport
;
533 snprintf(sport
->port_gid
, sizeof(sport
->port_gid
),
535 be64_to_cpu(sport
->gid
.global
.subnet_prefix
),
536 be64_to_cpu(sport
->gid
.global
.interface_id
));
538 if (!sport
->mad_agent
) {
539 memset(®_req
, 0, sizeof(reg_req
));
540 reg_req
.mgmt_class
= IB_MGMT_CLASS_DEVICE_MGMT
;
541 reg_req
.mgmt_class_version
= IB_MGMT_BASE_VERSION
;
542 set_bit(IB_MGMT_METHOD_GET
, reg_req
.method_mask
);
543 set_bit(IB_MGMT_METHOD_SET
, reg_req
.method_mask
);
545 sport
->mad_agent
= ib_register_mad_agent(sport
->sdev
->device
,
549 srpt_mad_send_handler
,
550 srpt_mad_recv_handler
,
552 if (IS_ERR(sport
->mad_agent
)) {
553 ret
= PTR_ERR(sport
->mad_agent
);
554 sport
->mad_agent
= NULL
;
563 port_modify
.set_port_cap_mask
= 0;
564 port_modify
.clr_port_cap_mask
= IB_PORT_DEVICE_MGMT_SUP
;
565 ib_modify_port(sport
->sdev
->device
, sport
->port
, 0, &port_modify
);
573 * srpt_unregister_mad_agent() - Unregister MAD callback functions.
575 * Note: It is safe to call this function more than once for the same device.
577 static void srpt_unregister_mad_agent(struct srpt_device
*sdev
)
579 struct ib_port_modify port_modify
= {
580 .clr_port_cap_mask
= IB_PORT_DEVICE_MGMT_SUP
,
582 struct srpt_port
*sport
;
585 for (i
= 1; i
<= sdev
->device
->phys_port_cnt
; i
++) {
586 sport
= &sdev
->port
[i
- 1];
587 WARN_ON(sport
->port
!= i
);
588 if (ib_modify_port(sdev
->device
, i
, 0, &port_modify
) < 0)
589 pr_err("disabling MAD processing failed.\n");
590 if (sport
->mad_agent
) {
591 ib_unregister_mad_agent(sport
->mad_agent
);
592 sport
->mad_agent
= NULL
;
598 * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure.
600 static struct srpt_ioctx
*srpt_alloc_ioctx(struct srpt_device
*sdev
,
601 int ioctx_size
, int dma_size
,
602 enum dma_data_direction dir
)
604 struct srpt_ioctx
*ioctx
;
606 ioctx
= kmalloc(ioctx_size
, GFP_KERNEL
);
610 ioctx
->buf
= kmalloc(dma_size
, GFP_KERNEL
);
614 ioctx
->dma
= ib_dma_map_single(sdev
->device
, ioctx
->buf
, dma_size
, dir
);
615 if (ib_dma_mapping_error(sdev
->device
, ioctx
->dma
))
629 * srpt_free_ioctx() - Free an SRPT I/O context structure.
631 static void srpt_free_ioctx(struct srpt_device
*sdev
, struct srpt_ioctx
*ioctx
,
632 int dma_size
, enum dma_data_direction dir
)
637 ib_dma_unmap_single(sdev
->device
, ioctx
->dma
, dma_size
, dir
);
643 * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures.
644 * @sdev: Device to allocate the I/O context ring for.
645 * @ring_size: Number of elements in the I/O context ring.
646 * @ioctx_size: I/O context size.
647 * @dma_size: DMA buffer size.
648 * @dir: DMA data direction.
650 static struct srpt_ioctx
**srpt_alloc_ioctx_ring(struct srpt_device
*sdev
,
651 int ring_size
, int ioctx_size
,
652 int dma_size
, enum dma_data_direction dir
)
654 struct srpt_ioctx
**ring
;
657 WARN_ON(ioctx_size
!= sizeof(struct srpt_recv_ioctx
)
658 && ioctx_size
!= sizeof(struct srpt_send_ioctx
));
660 ring
= kmalloc(ring_size
* sizeof(ring
[0]), GFP_KERNEL
);
663 for (i
= 0; i
< ring_size
; ++i
) {
664 ring
[i
] = srpt_alloc_ioctx(sdev
, ioctx_size
, dma_size
, dir
);
673 srpt_free_ioctx(sdev
, ring
[i
], dma_size
, dir
);
681 * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures.
683 static void srpt_free_ioctx_ring(struct srpt_ioctx
**ioctx_ring
,
684 struct srpt_device
*sdev
, int ring_size
,
685 int dma_size
, enum dma_data_direction dir
)
689 for (i
= 0; i
< ring_size
; ++i
)
690 srpt_free_ioctx(sdev
, ioctx_ring
[i
], dma_size
, dir
);
695 * srpt_get_cmd_state() - Get the state of a SCSI command.
697 static enum srpt_command_state
srpt_get_cmd_state(struct srpt_send_ioctx
*ioctx
)
699 enum srpt_command_state state
;
704 spin_lock_irqsave(&ioctx
->spinlock
, flags
);
705 state
= ioctx
->state
;
706 spin_unlock_irqrestore(&ioctx
->spinlock
, flags
);
711 * srpt_set_cmd_state() - Set the state of a SCSI command.
713 * Does not modify the state of aborted commands. Returns the previous command
716 static enum srpt_command_state
srpt_set_cmd_state(struct srpt_send_ioctx
*ioctx
,
717 enum srpt_command_state
new)
719 enum srpt_command_state previous
;
724 spin_lock_irqsave(&ioctx
->spinlock
, flags
);
725 previous
= ioctx
->state
;
726 if (previous
!= SRPT_STATE_DONE
)
728 spin_unlock_irqrestore(&ioctx
->spinlock
, flags
);
734 * srpt_test_and_set_cmd_state() - Test and set the state of a command.
736 * Returns true if and only if the previous command state was equal to 'old'.
738 static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx
*ioctx
,
739 enum srpt_command_state old
,
740 enum srpt_command_state
new)
742 enum srpt_command_state previous
;
746 WARN_ON(old
== SRPT_STATE_DONE
);
747 WARN_ON(new == SRPT_STATE_NEW
);
749 spin_lock_irqsave(&ioctx
->spinlock
, flags
);
750 previous
= ioctx
->state
;
753 spin_unlock_irqrestore(&ioctx
->spinlock
, flags
);
754 return previous
== old
;
758 * srpt_post_recv() - Post an IB receive request.
760 static int srpt_post_recv(struct srpt_device
*sdev
,
761 struct srpt_recv_ioctx
*ioctx
)
764 struct ib_recv_wr wr
, *bad_wr
;
767 list
.addr
= ioctx
->ioctx
.dma
;
768 list
.length
= srp_max_req_size
;
769 list
.lkey
= sdev
->pd
->local_dma_lkey
;
771 ioctx
->ioctx
.cqe
.done
= srpt_recv_done
;
772 wr
.wr_cqe
= &ioctx
->ioctx
.cqe
;
777 return ib_post_srq_recv(sdev
->srq
, &wr
, &bad_wr
);
781 * srpt_zerolength_write() - Perform a zero-length RDMA write.
783 * A quote from the InfiniBand specification: C9-88: For an HCA responder
784 * using Reliable Connection service, for each zero-length RDMA READ or WRITE
785 * request, the R_Key shall not be validated, even if the request includes
788 static int srpt_zerolength_write(struct srpt_rdma_ch
*ch
)
790 struct ib_send_wr wr
, *bad_wr
;
792 memset(&wr
, 0, sizeof(wr
));
793 wr
.opcode
= IB_WR_RDMA_WRITE
;
794 wr
.wr_cqe
= &ch
->zw_cqe
;
795 wr
.send_flags
= IB_SEND_SIGNALED
;
796 return ib_post_send(ch
->qp
, &wr
, &bad_wr
);
799 static void srpt_zerolength_write_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
801 struct srpt_rdma_ch
*ch
= cq
->cq_context
;
803 if (wc
->status
== IB_WC_SUCCESS
) {
804 srpt_process_wait_list(ch
);
806 if (srpt_set_ch_state(ch
, CH_DISCONNECTED
))
807 schedule_work(&ch
->release_work
);
809 WARN_ONCE(1, "%s-%d\n", ch
->sess_name
, ch
->qp
->qp_num
);
813 static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx
*ioctx
,
814 struct srp_direct_buf
*db
, int nbufs
, struct scatterlist
**sg
,
817 enum dma_data_direction dir
= target_reverse_dma_direction(&ioctx
->cmd
);
818 struct srpt_rdma_ch
*ch
= ioctx
->ch
;
819 struct scatterlist
*prev
= NULL
;
824 ioctx
->rw_ctxs
= &ioctx
->s_rw_ctx
;
826 ioctx
->rw_ctxs
= kmalloc_array(nbufs
, sizeof(*ioctx
->rw_ctxs
),
832 for (i
= ioctx
->n_rw_ctx
; i
< nbufs
; i
++, db
++) {
833 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
834 u64 remote_addr
= be64_to_cpu(db
->va
);
835 u32 size
= be32_to_cpu(db
->len
);
836 u32 rkey
= be32_to_cpu(db
->key
);
838 ret
= target_alloc_sgl(&ctx
->sg
, &ctx
->nents
, size
, false,
843 ret
= rdma_rw_ctx_init(&ctx
->rw
, ch
->qp
, ch
->sport
->port
,
844 ctx
->sg
, ctx
->nents
, 0, remote_addr
, rkey
, dir
);
846 target_free_sgl(ctx
->sg
, ctx
->nents
);
850 ioctx
->n_rdma
+= ret
;
854 sg_unmark_end(&prev
[prev_nents
- 1]);
855 sg_chain(prev
, prev_nents
+ 1, ctx
->sg
);
861 prev_nents
= ctx
->nents
;
863 *sg_cnt
+= ctx
->nents
;
870 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
872 rdma_rw_ctx_destroy(&ctx
->rw
, ch
->qp
, ch
->sport
->port
,
873 ctx
->sg
, ctx
->nents
, dir
);
874 target_free_sgl(ctx
->sg
, ctx
->nents
);
876 if (ioctx
->rw_ctxs
!= &ioctx
->s_rw_ctx
)
877 kfree(ioctx
->rw_ctxs
);
881 static void srpt_free_rw_ctxs(struct srpt_rdma_ch
*ch
,
882 struct srpt_send_ioctx
*ioctx
)
884 enum dma_data_direction dir
= target_reverse_dma_direction(&ioctx
->cmd
);
887 for (i
= 0; i
< ioctx
->n_rw_ctx
; i
++) {
888 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
890 rdma_rw_ctx_destroy(&ctx
->rw
, ch
->qp
, ch
->sport
->port
,
891 ctx
->sg
, ctx
->nents
, dir
);
892 target_free_sgl(ctx
->sg
, ctx
->nents
);
895 if (ioctx
->rw_ctxs
!= &ioctx
->s_rw_ctx
)
896 kfree(ioctx
->rw_ctxs
);
899 static inline void *srpt_get_desc_buf(struct srp_cmd
*srp_cmd
)
902 * The pointer computations below will only be compiled correctly
903 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
904 * whether srp_cmd::add_data has been declared as a byte pointer.
906 BUILD_BUG_ON(!__same_type(srp_cmd
->add_data
[0], (s8
)0) &&
907 !__same_type(srp_cmd
->add_data
[0], (u8
)0));
910 * According to the SRP spec, the lower two bits of the 'ADDITIONAL
911 * CDB LENGTH' field are reserved and the size in bytes of this field
912 * is four times the value specified in bits 3..7. Hence the "& ~3".
914 return srp_cmd
->add_data
+ (srp_cmd
->add_cdb_len
& ~3);
918 * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request.
919 * @ioctx: Pointer to the I/O context associated with the request.
920 * @srp_cmd: Pointer to the SRP_CMD request data.
921 * @dir: Pointer to the variable to which the transfer direction will be
923 * @data_len: Pointer to the variable to which the total data length of all
924 * descriptors in the SRP_CMD request will be written.
926 * This function initializes ioctx->nrbuf and ioctx->r_bufs.
928 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
929 * -ENOMEM when memory allocation fails and zero upon success.
931 static int srpt_get_desc_tbl(struct srpt_send_ioctx
*ioctx
,
932 struct srp_cmd
*srp_cmd
, enum dma_data_direction
*dir
,
933 struct scatterlist
**sg
, unsigned *sg_cnt
, u64
*data_len
)
939 * The lower four bits of the buffer format field contain the DATA-IN
940 * buffer descriptor format, and the highest four bits contain the
941 * DATA-OUT buffer descriptor format.
943 if (srp_cmd
->buf_fmt
& 0xf)
944 /* DATA-IN: transfer data from target to initiator (read). */
945 *dir
= DMA_FROM_DEVICE
;
946 else if (srp_cmd
->buf_fmt
>> 4)
947 /* DATA-OUT: transfer data from initiator to target (write). */
948 *dir
= DMA_TO_DEVICE
;
952 /* initialize data_direction early as srpt_alloc_rw_ctxs needs it */
953 ioctx
->cmd
.data_direction
= *dir
;
955 if (((srp_cmd
->buf_fmt
& 0xf) == SRP_DATA_DESC_DIRECT
) ||
956 ((srp_cmd
->buf_fmt
>> 4) == SRP_DATA_DESC_DIRECT
)) {
957 struct srp_direct_buf
*db
= srpt_get_desc_buf(srp_cmd
);
959 *data_len
= be32_to_cpu(db
->len
);
960 return srpt_alloc_rw_ctxs(ioctx
, db
, 1, sg
, sg_cnt
);
961 } else if (((srp_cmd
->buf_fmt
& 0xf) == SRP_DATA_DESC_INDIRECT
) ||
962 ((srp_cmd
->buf_fmt
>> 4) == SRP_DATA_DESC_INDIRECT
)) {
963 struct srp_indirect_buf
*idb
= srpt_get_desc_buf(srp_cmd
);
964 int nbufs
= be32_to_cpu(idb
->table_desc
.len
) /
965 sizeof(struct srp_direct_buf
);
968 (srp_cmd
->data_out_desc_cnt
+ srp_cmd
->data_in_desc_cnt
)) {
969 pr_err("received unsupported SRP_CMD request"
970 " type (%u out + %u in != %u / %zu)\n",
971 srp_cmd
->data_out_desc_cnt
,
972 srp_cmd
->data_in_desc_cnt
,
973 be32_to_cpu(idb
->table_desc
.len
),
974 sizeof(struct srp_direct_buf
));
978 *data_len
= be32_to_cpu(idb
->len
);
979 return srpt_alloc_rw_ctxs(ioctx
, idb
->desc_list
, nbufs
,
988 * srpt_init_ch_qp() - Initialize queue pair attributes.
990 * Initialized the attributes of queue pair 'qp' by allowing local write,
991 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
993 static int srpt_init_ch_qp(struct srpt_rdma_ch
*ch
, struct ib_qp
*qp
)
995 struct ib_qp_attr
*attr
;
998 attr
= kzalloc(sizeof(*attr
), GFP_KERNEL
);
1002 attr
->qp_state
= IB_QPS_INIT
;
1003 attr
->qp_access_flags
= IB_ACCESS_LOCAL_WRITE
| IB_ACCESS_REMOTE_READ
|
1004 IB_ACCESS_REMOTE_WRITE
;
1005 attr
->port_num
= ch
->sport
->port
;
1006 attr
->pkey_index
= 0;
1008 ret
= ib_modify_qp(qp
, attr
,
1009 IB_QP_STATE
| IB_QP_ACCESS_FLAGS
| IB_QP_PORT
|
1017 * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR).
1018 * @ch: channel of the queue pair.
1019 * @qp: queue pair to change the state of.
1021 * Returns zero upon success and a negative value upon failure.
1023 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1024 * If this structure ever becomes larger, it might be necessary to allocate
1025 * it dynamically instead of on the stack.
1027 static int srpt_ch_qp_rtr(struct srpt_rdma_ch
*ch
, struct ib_qp
*qp
)
1029 struct ib_qp_attr qp_attr
;
1033 qp_attr
.qp_state
= IB_QPS_RTR
;
1034 ret
= ib_cm_init_qp_attr(ch
->cm_id
, &qp_attr
, &attr_mask
);
1038 qp_attr
.max_dest_rd_atomic
= 4;
1040 ret
= ib_modify_qp(qp
, &qp_attr
, attr_mask
);
1047 * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS).
1048 * @ch: channel of the queue pair.
1049 * @qp: queue pair to change the state of.
1051 * Returns zero upon success and a negative value upon failure.
1053 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1054 * If this structure ever becomes larger, it might be necessary to allocate
1055 * it dynamically instead of on the stack.
1057 static int srpt_ch_qp_rts(struct srpt_rdma_ch
*ch
, struct ib_qp
*qp
)
1059 struct ib_qp_attr qp_attr
;
1063 qp_attr
.qp_state
= IB_QPS_RTS
;
1064 ret
= ib_cm_init_qp_attr(ch
->cm_id
, &qp_attr
, &attr_mask
);
1068 qp_attr
.max_rd_atomic
= 4;
1070 ret
= ib_modify_qp(qp
, &qp_attr
, attr_mask
);
1077 * srpt_ch_qp_err() - Set the channel queue pair state to 'error'.
1079 static int srpt_ch_qp_err(struct srpt_rdma_ch
*ch
)
1081 struct ib_qp_attr qp_attr
;
1083 qp_attr
.qp_state
= IB_QPS_ERR
;
1084 return ib_modify_qp(ch
->qp
, &qp_attr
, IB_QP_STATE
);
1088 * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator.
1090 static struct srpt_send_ioctx
*srpt_get_send_ioctx(struct srpt_rdma_ch
*ch
)
1092 struct srpt_send_ioctx
*ioctx
;
1093 unsigned long flags
;
1098 spin_lock_irqsave(&ch
->spinlock
, flags
);
1099 if (!list_empty(&ch
->free_list
)) {
1100 ioctx
= list_first_entry(&ch
->free_list
,
1101 struct srpt_send_ioctx
, free_list
);
1102 list_del(&ioctx
->free_list
);
1104 spin_unlock_irqrestore(&ch
->spinlock
, flags
);
1109 BUG_ON(ioctx
->ch
!= ch
);
1110 spin_lock_init(&ioctx
->spinlock
);
1111 ioctx
->state
= SRPT_STATE_NEW
;
1113 ioctx
->n_rw_ctx
= 0;
1114 init_completion(&ioctx
->tx_done
);
1115 ioctx
->queue_status_only
= false;
1117 * transport_init_se_cmd() does not initialize all fields, so do it
1120 memset(&ioctx
->cmd
, 0, sizeof(ioctx
->cmd
));
1121 memset(&ioctx
->sense_data
, 0, sizeof(ioctx
->sense_data
));
1127 * srpt_abort_cmd() - Abort a SCSI command.
1128 * @ioctx: I/O context associated with the SCSI command.
1129 * @context: Preferred execution context.
1131 static int srpt_abort_cmd(struct srpt_send_ioctx
*ioctx
)
1133 enum srpt_command_state state
;
1134 unsigned long flags
;
1139 * If the command is in a state where the target core is waiting for
1140 * the ib_srpt driver, change the state to the next state.
1143 spin_lock_irqsave(&ioctx
->spinlock
, flags
);
1144 state
= ioctx
->state
;
1146 case SRPT_STATE_NEED_DATA
:
1147 ioctx
->state
= SRPT_STATE_DATA_IN
;
1149 case SRPT_STATE_CMD_RSP_SENT
:
1150 case SRPT_STATE_MGMT_RSP_SENT
:
1151 ioctx
->state
= SRPT_STATE_DONE
;
1154 WARN_ONCE(true, "%s: unexpected I/O context state %d\n",
1158 spin_unlock_irqrestore(&ioctx
->spinlock
, flags
);
1160 pr_debug("Aborting cmd with state %d and tag %lld\n", state
,
1164 case SRPT_STATE_NEW
:
1165 case SRPT_STATE_DATA_IN
:
1166 case SRPT_STATE_MGMT
:
1167 case SRPT_STATE_DONE
:
1169 * Do nothing - defer abort processing until
1170 * srpt_queue_response() is invoked.
1173 case SRPT_STATE_NEED_DATA
:
1174 pr_debug("tag %#llx: RDMA read error\n", ioctx
->cmd
.tag
);
1175 transport_generic_request_failure(&ioctx
->cmd
,
1176 TCM_CHECK_CONDITION_ABORT_CMD
);
1178 case SRPT_STATE_CMD_RSP_SENT
:
1180 * SRP_RSP sending failed or the SRP_RSP send completion has
1181 * not been received in time.
1183 transport_generic_free_cmd(&ioctx
->cmd
, 0);
1185 case SRPT_STATE_MGMT_RSP_SENT
:
1186 transport_generic_free_cmd(&ioctx
->cmd
, 0);
1189 WARN(1, "Unexpected command state (%d)", state
);
1197 * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
1198 * the data that has been transferred via IB RDMA had to be postponed until the
1199 * check_stop_free() callback. None of this is necessary anymore and needs to
1202 static void srpt_rdma_read_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1204 struct srpt_rdma_ch
*ch
= cq
->cq_context
;
1205 struct srpt_send_ioctx
*ioctx
=
1206 container_of(wc
->wr_cqe
, struct srpt_send_ioctx
, rdma_cqe
);
1208 WARN_ON(ioctx
->n_rdma
<= 0);
1209 atomic_add(ioctx
->n_rdma
, &ch
->sq_wr_avail
);
1212 if (unlikely(wc
->status
!= IB_WC_SUCCESS
)) {
1213 pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",
1215 srpt_abort_cmd(ioctx
);
1219 if (srpt_test_and_set_cmd_state(ioctx
, SRPT_STATE_NEED_DATA
,
1220 SRPT_STATE_DATA_IN
))
1221 target_execute_cmd(&ioctx
->cmd
);
1223 pr_err("%s[%d]: wrong state = %d\n", __func__
,
1224 __LINE__
, srpt_get_cmd_state(ioctx
));
1228 * srpt_build_cmd_rsp() - Build an SRP_RSP response.
1229 * @ch: RDMA channel through which the request has been received.
1230 * @ioctx: I/O context associated with the SRP_CMD request. The response will
1231 * be built in the buffer ioctx->buf points at and hence this function will
1232 * overwrite the request data.
1233 * @tag: tag of the request for which this response is being generated.
1234 * @status: value for the STATUS field of the SRP_RSP information unit.
1236 * Returns the size in bytes of the SRP_RSP response.
1238 * An SRP_RSP response contains a SCSI status or service response. See also
1239 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1240 * response. See also SPC-2 for more information about sense data.
1242 static int srpt_build_cmd_rsp(struct srpt_rdma_ch
*ch
,
1243 struct srpt_send_ioctx
*ioctx
, u64 tag
,
1246 struct srp_rsp
*srp_rsp
;
1247 const u8
*sense_data
;
1248 int sense_data_len
, max_sense_len
;
1251 * The lowest bit of all SAM-3 status codes is zero (see also
1252 * paragraph 5.3 in SAM-3).
1254 WARN_ON(status
& 1);
1256 srp_rsp
= ioctx
->ioctx
.buf
;
1259 sense_data
= ioctx
->sense_data
;
1260 sense_data_len
= ioctx
->cmd
.scsi_sense_length
;
1261 WARN_ON(sense_data_len
> sizeof(ioctx
->sense_data
));
1263 memset(srp_rsp
, 0, sizeof(*srp_rsp
));
1264 srp_rsp
->opcode
= SRP_RSP
;
1265 srp_rsp
->req_lim_delta
=
1266 cpu_to_be32(1 + atomic_xchg(&ch
->req_lim_delta
, 0));
1268 srp_rsp
->status
= status
;
1270 if (sense_data_len
) {
1271 BUILD_BUG_ON(MIN_MAX_RSP_SIZE
<= sizeof(*srp_rsp
));
1272 max_sense_len
= ch
->max_ti_iu_len
- sizeof(*srp_rsp
);
1273 if (sense_data_len
> max_sense_len
) {
1274 pr_warn("truncated sense data from %d to %d"
1275 " bytes\n", sense_data_len
, max_sense_len
);
1276 sense_data_len
= max_sense_len
;
1279 srp_rsp
->flags
|= SRP_RSP_FLAG_SNSVALID
;
1280 srp_rsp
->sense_data_len
= cpu_to_be32(sense_data_len
);
1281 memcpy(srp_rsp
+ 1, sense_data
, sense_data_len
);
1284 return sizeof(*srp_rsp
) + sense_data_len
;
1288 * srpt_build_tskmgmt_rsp() - Build a task management response.
1289 * @ch: RDMA channel through which the request has been received.
1290 * @ioctx: I/O context in which the SRP_RSP response will be built.
1291 * @rsp_code: RSP_CODE that will be stored in the response.
1292 * @tag: Tag of the request for which this response is being generated.
1294 * Returns the size in bytes of the SRP_RSP response.
1296 * An SRP_RSP response contains a SCSI status or service response. See also
1297 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1300 static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch
*ch
,
1301 struct srpt_send_ioctx
*ioctx
,
1302 u8 rsp_code
, u64 tag
)
1304 struct srp_rsp
*srp_rsp
;
1309 resp_len
= sizeof(*srp_rsp
) + resp_data_len
;
1311 srp_rsp
= ioctx
->ioctx
.buf
;
1313 memset(srp_rsp
, 0, sizeof(*srp_rsp
));
1315 srp_rsp
->opcode
= SRP_RSP
;
1316 srp_rsp
->req_lim_delta
=
1317 cpu_to_be32(1 + atomic_xchg(&ch
->req_lim_delta
, 0));
1320 srp_rsp
->flags
|= SRP_RSP_FLAG_RSPVALID
;
1321 srp_rsp
->resp_data_len
= cpu_to_be32(resp_data_len
);
1322 srp_rsp
->data
[3] = rsp_code
;
1327 static int srpt_check_stop_free(struct se_cmd
*cmd
)
1329 struct srpt_send_ioctx
*ioctx
= container_of(cmd
,
1330 struct srpt_send_ioctx
, cmd
);
1332 return target_put_sess_cmd(&ioctx
->cmd
);
1336 * srpt_handle_cmd() - Process SRP_CMD.
1338 static void srpt_handle_cmd(struct srpt_rdma_ch
*ch
,
1339 struct srpt_recv_ioctx
*recv_ioctx
,
1340 struct srpt_send_ioctx
*send_ioctx
)
1343 struct srp_cmd
*srp_cmd
;
1344 struct scatterlist
*sg
= NULL
;
1345 unsigned sg_cnt
= 0;
1347 enum dma_data_direction dir
;
1350 BUG_ON(!send_ioctx
);
1352 srp_cmd
= recv_ioctx
->ioctx
.buf
;
1353 cmd
= &send_ioctx
->cmd
;
1354 cmd
->tag
= srp_cmd
->tag
;
1356 switch (srp_cmd
->task_attr
) {
1357 case SRP_CMD_SIMPLE_Q
:
1358 cmd
->sam_task_attr
= TCM_SIMPLE_TAG
;
1360 case SRP_CMD_ORDERED_Q
:
1362 cmd
->sam_task_attr
= TCM_ORDERED_TAG
;
1364 case SRP_CMD_HEAD_OF_Q
:
1365 cmd
->sam_task_attr
= TCM_HEAD_TAG
;
1368 cmd
->sam_task_attr
= TCM_ACA_TAG
;
1372 rc
= srpt_get_desc_tbl(send_ioctx
, srp_cmd
, &dir
, &sg
, &sg_cnt
,
1375 if (rc
!= -EAGAIN
) {
1376 pr_err("0x%llx: parsing SRP descriptor table failed.\n",
1382 rc
= target_submit_cmd_map_sgls(cmd
, ch
->sess
, srp_cmd
->cdb
,
1383 &send_ioctx
->sense_data
[0],
1384 scsilun_to_int(&srp_cmd
->lun
), data_len
,
1385 TCM_SIMPLE_TAG
, dir
, TARGET_SCF_ACK_KREF
,
1386 sg
, sg_cnt
, NULL
, 0, NULL
, 0);
1388 pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc
,
1395 send_ioctx
->state
= SRPT_STATE_DONE
;
1396 srpt_release_cmd(cmd
);
1399 static int srp_tmr_to_tcm(int fn
)
1402 case SRP_TSK_ABORT_TASK
:
1403 return TMR_ABORT_TASK
;
1404 case SRP_TSK_ABORT_TASK_SET
:
1405 return TMR_ABORT_TASK_SET
;
1406 case SRP_TSK_CLEAR_TASK_SET
:
1407 return TMR_CLEAR_TASK_SET
;
1408 case SRP_TSK_LUN_RESET
:
1409 return TMR_LUN_RESET
;
1410 case SRP_TSK_CLEAR_ACA
:
1411 return TMR_CLEAR_ACA
;
1418 * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit.
1420 * Returns 0 if and only if the request will be processed by the target core.
1422 * For more information about SRP_TSK_MGMT information units, see also section
1423 * 6.7 in the SRP r16a document.
1425 static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch
*ch
,
1426 struct srpt_recv_ioctx
*recv_ioctx
,
1427 struct srpt_send_ioctx
*send_ioctx
)
1429 struct srp_tsk_mgmt
*srp_tsk
;
1431 struct se_session
*sess
= ch
->sess
;
1435 BUG_ON(!send_ioctx
);
1437 srp_tsk
= recv_ioctx
->ioctx
.buf
;
1438 cmd
= &send_ioctx
->cmd
;
1440 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld"
1441 " cm_id %p sess %p\n", srp_tsk
->tsk_mgmt_func
,
1442 srp_tsk
->task_tag
, srp_tsk
->tag
, ch
->cm_id
, ch
->sess
);
1444 srpt_set_cmd_state(send_ioctx
, SRPT_STATE_MGMT
);
1445 send_ioctx
->cmd
.tag
= srp_tsk
->tag
;
1446 tcm_tmr
= srp_tmr_to_tcm(srp_tsk
->tsk_mgmt_func
);
1447 rc
= target_submit_tmr(&send_ioctx
->cmd
, sess
, NULL
,
1448 scsilun_to_int(&srp_tsk
->lun
), srp_tsk
, tcm_tmr
,
1449 GFP_KERNEL
, srp_tsk
->task_tag
,
1450 TARGET_SCF_ACK_KREF
);
1452 send_ioctx
->cmd
.se_tmr_req
->response
= TMR_FUNCTION_REJECTED
;
1457 transport_send_check_condition_and_sense(cmd
, 0, 0); // XXX:
1461 * srpt_handle_new_iu() - Process a newly received information unit.
1462 * @ch: RDMA channel through which the information unit has been received.
1463 * @ioctx: SRPT I/O context associated with the information unit.
1465 static void srpt_handle_new_iu(struct srpt_rdma_ch
*ch
,
1466 struct srpt_recv_ioctx
*recv_ioctx
,
1467 struct srpt_send_ioctx
*send_ioctx
)
1469 struct srp_cmd
*srp_cmd
;
1472 BUG_ON(!recv_ioctx
);
1474 ib_dma_sync_single_for_cpu(ch
->sport
->sdev
->device
,
1475 recv_ioctx
->ioctx
.dma
, srp_max_req_size
,
1478 if (unlikely(ch
->state
== CH_CONNECTING
))
1481 if (unlikely(ch
->state
!= CH_LIVE
))
1484 srp_cmd
= recv_ioctx
->ioctx
.buf
;
1485 if (srp_cmd
->opcode
== SRP_CMD
|| srp_cmd
->opcode
== SRP_TSK_MGMT
) {
1487 if (!list_empty(&ch
->cmd_wait_list
))
1489 send_ioctx
= srpt_get_send_ioctx(ch
);
1491 if (unlikely(!send_ioctx
))
1495 switch (srp_cmd
->opcode
) {
1497 srpt_handle_cmd(ch
, recv_ioctx
, send_ioctx
);
1500 srpt_handle_tsk_mgmt(ch
, recv_ioctx
, send_ioctx
);
1503 pr_err("Not yet implemented: SRP_I_LOGOUT\n");
1506 pr_debug("received SRP_CRED_RSP\n");
1509 pr_debug("received SRP_AER_RSP\n");
1512 pr_err("Received SRP_RSP\n");
1515 pr_err("received IU with unknown opcode 0x%x\n",
1520 srpt_post_recv(ch
->sport
->sdev
, recv_ioctx
);
1524 list_add_tail(&recv_ioctx
->wait_list
, &ch
->cmd_wait_list
);
1527 static void srpt_recv_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1529 struct srpt_rdma_ch
*ch
= cq
->cq_context
;
1530 struct srpt_recv_ioctx
*ioctx
=
1531 container_of(wc
->wr_cqe
, struct srpt_recv_ioctx
, ioctx
.cqe
);
1533 if (wc
->status
== IB_WC_SUCCESS
) {
1536 req_lim
= atomic_dec_return(&ch
->req_lim
);
1537 if (unlikely(req_lim
< 0))
1538 pr_err("req_lim = %d < 0\n", req_lim
);
1539 srpt_handle_new_iu(ch
, ioctx
, NULL
);
1541 pr_info("receiving failed for ioctx %p with status %d\n",
1547 * This function must be called from the context in which RDMA completions are
1548 * processed because it accesses the wait list without protection against
1549 * access from other threads.
1551 static void srpt_process_wait_list(struct srpt_rdma_ch
*ch
)
1553 struct srpt_send_ioctx
*ioctx
;
1555 while (!list_empty(&ch
->cmd_wait_list
) &&
1556 ch
->state
>= CH_LIVE
&&
1557 (ioctx
= srpt_get_send_ioctx(ch
)) != NULL
) {
1558 struct srpt_recv_ioctx
*recv_ioctx
;
1560 recv_ioctx
= list_first_entry(&ch
->cmd_wait_list
,
1561 struct srpt_recv_ioctx
,
1563 list_del(&recv_ioctx
->wait_list
);
1564 srpt_handle_new_iu(ch
, recv_ioctx
, ioctx
);
1569 * Note: Although this has not yet been observed during tests, at least in
1570 * theory it is possible that the srpt_get_send_ioctx() call invoked by
1571 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
1572 * value in each response is set to one, and it is possible that this response
1573 * makes the initiator send a new request before the send completion for that
1574 * response has been processed. This could e.g. happen if the call to
1575 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
1576 * if IB retransmission causes generation of the send completion to be
1577 * delayed. Incoming information units for which srpt_get_send_ioctx() fails
1578 * are queued on cmd_wait_list. The code below processes these delayed
1579 * requests one at a time.
1581 static void srpt_send_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1583 struct srpt_rdma_ch
*ch
= cq
->cq_context
;
1584 struct srpt_send_ioctx
*ioctx
=
1585 container_of(wc
->wr_cqe
, struct srpt_send_ioctx
, ioctx
.cqe
);
1586 enum srpt_command_state state
;
1588 state
= srpt_set_cmd_state(ioctx
, SRPT_STATE_DONE
);
1590 WARN_ON(state
!= SRPT_STATE_CMD_RSP_SENT
&&
1591 state
!= SRPT_STATE_MGMT_RSP_SENT
);
1593 atomic_add(1 + ioctx
->n_rdma
, &ch
->sq_wr_avail
);
1595 if (wc
->status
!= IB_WC_SUCCESS
)
1596 pr_info("sending response for ioctx 0x%p failed"
1597 " with status %d\n", ioctx
, wc
->status
);
1599 if (state
!= SRPT_STATE_DONE
) {
1600 transport_generic_free_cmd(&ioctx
->cmd
, 0);
1602 pr_err("IB completion has been received too late for"
1603 " wr_id = %u.\n", ioctx
->ioctx
.index
);
1606 srpt_process_wait_list(ch
);
1610 * srpt_create_ch_ib() - Create receive and send completion queues.
1612 static int srpt_create_ch_ib(struct srpt_rdma_ch
*ch
)
1614 struct ib_qp_init_attr
*qp_init
;
1615 struct srpt_port
*sport
= ch
->sport
;
1616 struct srpt_device
*sdev
= sport
->sdev
;
1617 const struct ib_device_attr
*attrs
= &sdev
->device
->attrs
;
1618 u32 srp_sq_size
= sport
->port_attrib
.srp_sq_size
;
1621 WARN_ON(ch
->rq_size
< 1);
1624 qp_init
= kzalloc(sizeof(*qp_init
), GFP_KERNEL
);
1629 ch
->cq
= ib_alloc_cq(sdev
->device
, ch
, ch
->rq_size
+ srp_sq_size
,
1630 0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE
);
1631 if (IS_ERR(ch
->cq
)) {
1632 ret
= PTR_ERR(ch
->cq
);
1633 pr_err("failed to create CQ cqe= %d ret= %d\n",
1634 ch
->rq_size
+ srp_sq_size
, ret
);
1638 qp_init
->qp_context
= (void *)ch
;
1639 qp_init
->event_handler
1640 = (void(*)(struct ib_event
*, void*))srpt_qp_event
;
1641 qp_init
->send_cq
= ch
->cq
;
1642 qp_init
->recv_cq
= ch
->cq
;
1643 qp_init
->srq
= sdev
->srq
;
1644 qp_init
->sq_sig_type
= IB_SIGNAL_REQ_WR
;
1645 qp_init
->qp_type
= IB_QPT_RC
;
1647 * We divide up our send queue size into half SEND WRs to send the
1648 * completions, and half R/W contexts to actually do the RDMA
1649 * READ/WRITE transfers. Note that we need to allocate CQ slots for
1650 * both both, as RDMA contexts will also post completions for the
1653 qp_init
->cap
.max_send_wr
= srp_sq_size
/ 2;
1654 qp_init
->cap
.max_rdma_ctxs
= srp_sq_size
/ 2;
1655 qp_init
->cap
.max_send_sge
= min(attrs
->max_sge
, SRPT_MAX_SG_PER_WQE
);
1656 qp_init
->port_num
= ch
->sport
->port
;
1658 ch
->qp
= ib_create_qp(sdev
->pd
, qp_init
);
1659 if (IS_ERR(ch
->qp
)) {
1660 ret
= PTR_ERR(ch
->qp
);
1661 if (ret
== -ENOMEM
) {
1663 if (srp_sq_size
>= MIN_SRPT_SQ_SIZE
) {
1664 ib_destroy_cq(ch
->cq
);
1668 pr_err("failed to create_qp ret= %d\n", ret
);
1669 goto err_destroy_cq
;
1672 atomic_set(&ch
->sq_wr_avail
, qp_init
->cap
.max_send_wr
);
1674 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
1675 __func__
, ch
->cq
->cqe
, qp_init
->cap
.max_send_sge
,
1676 qp_init
->cap
.max_send_wr
, ch
->cm_id
);
1678 ret
= srpt_init_ch_qp(ch
, ch
->qp
);
1680 goto err_destroy_qp
;
1687 ib_destroy_qp(ch
->qp
);
1693 static void srpt_destroy_ch_ib(struct srpt_rdma_ch
*ch
)
1695 ib_destroy_qp(ch
->qp
);
1700 * srpt_close_ch() - Close an RDMA channel.
1702 * Make sure all resources associated with the channel will be deallocated at
1703 * an appropriate time.
1705 * Returns true if and only if the channel state has been modified into
1708 static bool srpt_close_ch(struct srpt_rdma_ch
*ch
)
1712 if (!srpt_set_ch_state(ch
, CH_DRAINING
)) {
1713 pr_debug("%s-%d: already closed\n", ch
->sess_name
,
1718 kref_get(&ch
->kref
);
1720 ret
= srpt_ch_qp_err(ch
);
1722 pr_err("%s-%d: changing queue pair into error state failed: %d\n",
1723 ch
->sess_name
, ch
->qp
->qp_num
, ret
);
1725 pr_debug("%s-%d: queued zerolength write\n", ch
->sess_name
,
1727 ret
= srpt_zerolength_write(ch
);
1729 pr_err("%s-%d: queuing zero-length write failed: %d\n",
1730 ch
->sess_name
, ch
->qp
->qp_num
, ret
);
1731 if (srpt_set_ch_state(ch
, CH_DISCONNECTED
))
1732 schedule_work(&ch
->release_work
);
1737 kref_put(&ch
->kref
, srpt_free_ch
);
1743 * Change the channel state into CH_DISCONNECTING. If a channel has not yet
1744 * reached the connected state, close it. If a channel is in the connected
1745 * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is
1746 * the responsibility of the caller to ensure that this function is not
1747 * invoked concurrently with the code that accepts a connection. This means
1748 * that this function must either be invoked from inside a CM callback
1749 * function or that it must be invoked with the srpt_port.mutex held.
1751 static int srpt_disconnect_ch(struct srpt_rdma_ch
*ch
)
1755 if (!srpt_set_ch_state(ch
, CH_DISCONNECTING
))
1758 ret
= ib_send_cm_dreq(ch
->cm_id
, NULL
, 0);
1760 ret
= ib_send_cm_drep(ch
->cm_id
, NULL
, 0);
1762 if (ret
< 0 && srpt_close_ch(ch
))
1768 static void __srpt_close_all_ch(struct srpt_device
*sdev
)
1770 struct srpt_rdma_ch
*ch
;
1772 lockdep_assert_held(&sdev
->mutex
);
1774 list_for_each_entry(ch
, &sdev
->rch_list
, list
) {
1775 if (srpt_disconnect_ch(ch
) >= 0)
1776 pr_info("Closing channel %s-%d because target %s has been disabled\n",
1777 ch
->sess_name
, ch
->qp
->qp_num
,
1778 sdev
->device
->name
);
1783 static void srpt_free_ch(struct kref
*kref
)
1785 struct srpt_rdma_ch
*ch
= container_of(kref
, struct srpt_rdma_ch
, kref
);
1790 static void srpt_release_channel_work(struct work_struct
*w
)
1792 struct srpt_rdma_ch
*ch
;
1793 struct srpt_device
*sdev
;
1794 struct se_session
*se_sess
;
1796 ch
= container_of(w
, struct srpt_rdma_ch
, release_work
);
1797 pr_debug("%s: %s-%d; release_done = %p\n", __func__
, ch
->sess_name
,
1798 ch
->qp
->qp_num
, ch
->release_done
);
1800 sdev
= ch
->sport
->sdev
;
1806 target_sess_cmd_list_set_waiting(se_sess
);
1807 target_wait_for_sess_cmds(se_sess
);
1809 transport_deregister_session_configfs(se_sess
);
1810 transport_deregister_session(se_sess
);
1813 ib_destroy_cm_id(ch
->cm_id
);
1815 srpt_destroy_ch_ib(ch
);
1817 srpt_free_ioctx_ring((struct srpt_ioctx
**)ch
->ioctx_ring
,
1818 ch
->sport
->sdev
, ch
->rq_size
,
1819 ch
->rsp_size
, DMA_TO_DEVICE
);
1821 mutex_lock(&sdev
->mutex
);
1822 list_del_init(&ch
->list
);
1823 if (ch
->release_done
)
1824 complete(ch
->release_done
);
1825 mutex_unlock(&sdev
->mutex
);
1827 wake_up(&sdev
->ch_releaseQ
);
1829 kref_put(&ch
->kref
, srpt_free_ch
);
1833 * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED.
1835 * Ownership of the cm_id is transferred to the target session if this
1836 * functions returns zero. Otherwise the caller remains the owner of cm_id.
1838 static int srpt_cm_req_recv(struct ib_cm_id
*cm_id
,
1839 struct ib_cm_req_event_param
*param
,
1842 struct srpt_device
*sdev
= cm_id
->context
;
1843 struct srpt_port
*sport
= &sdev
->port
[param
->port
- 1];
1844 struct srp_login_req
*req
;
1845 struct srp_login_rsp
*rsp
;
1846 struct srp_login_rej
*rej
;
1847 struct ib_cm_rep_param
*rep_param
;
1848 struct srpt_rdma_ch
*ch
, *tmp_ch
;
1853 WARN_ON_ONCE(irqs_disabled());
1855 if (WARN_ON(!sdev
|| !private_data
))
1858 req
= (struct srp_login_req
*)private_data
;
1860 it_iu_len
= be32_to_cpu(req
->req_it_iu_len
);
1862 pr_info("Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx,"
1863 " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d"
1864 " (guid=0x%llx:0x%llx)\n",
1865 be64_to_cpu(*(__be64
*)&req
->initiator_port_id
[0]),
1866 be64_to_cpu(*(__be64
*)&req
->initiator_port_id
[8]),
1867 be64_to_cpu(*(__be64
*)&req
->target_port_id
[0]),
1868 be64_to_cpu(*(__be64
*)&req
->target_port_id
[8]),
1871 be64_to_cpu(*(__be64
*)&sdev
->port
[param
->port
- 1].gid
.raw
[0]),
1872 be64_to_cpu(*(__be64
*)&sdev
->port
[param
->port
- 1].gid
.raw
[8]));
1874 rsp
= kzalloc(sizeof(*rsp
), GFP_KERNEL
);
1875 rej
= kzalloc(sizeof(*rej
), GFP_KERNEL
);
1876 rep_param
= kzalloc(sizeof(*rep_param
), GFP_KERNEL
);
1878 if (!rsp
|| !rej
|| !rep_param
) {
1883 if (it_iu_len
> srp_max_req_size
|| it_iu_len
< 64) {
1884 rej
->reason
= cpu_to_be32(
1885 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE
);
1887 pr_err("rejected SRP_LOGIN_REQ because its"
1888 " length (%d bytes) is out of range (%d .. %d)\n",
1889 it_iu_len
, 64, srp_max_req_size
);
1893 if (!sport
->enabled
) {
1894 rej
->reason
= cpu_to_be32(
1895 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
1897 pr_err("rejected SRP_LOGIN_REQ because the target port"
1898 " has not yet been enabled\n");
1902 if ((req
->req_flags
& SRP_MTCH_ACTION
) == SRP_MULTICHAN_SINGLE
) {
1903 rsp
->rsp_flags
= SRP_LOGIN_RSP_MULTICHAN_NO_CHAN
;
1905 mutex_lock(&sdev
->mutex
);
1907 list_for_each_entry_safe(ch
, tmp_ch
, &sdev
->rch_list
, list
) {
1908 if (!memcmp(ch
->i_port_id
, req
->initiator_port_id
, 16)
1909 && !memcmp(ch
->t_port_id
, req
->target_port_id
, 16)
1910 && param
->port
== ch
->sport
->port
1911 && param
->listen_id
== ch
->sport
->sdev
->cm_id
1913 if (srpt_disconnect_ch(ch
) < 0)
1915 pr_info("Relogin - closed existing channel %s\n",
1918 SRP_LOGIN_RSP_MULTICHAN_TERMINATED
;
1922 mutex_unlock(&sdev
->mutex
);
1925 rsp
->rsp_flags
= SRP_LOGIN_RSP_MULTICHAN_MAINTAINED
;
1927 if (*(__be64
*)req
->target_port_id
!= cpu_to_be64(srpt_service_guid
)
1928 || *(__be64
*)(req
->target_port_id
+ 8) !=
1929 cpu_to_be64(srpt_service_guid
)) {
1930 rej
->reason
= cpu_to_be32(
1931 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL
);
1933 pr_err("rejected SRP_LOGIN_REQ because it"
1934 " has an invalid target port identifier.\n");
1938 ch
= kzalloc(sizeof(*ch
), GFP_KERNEL
);
1940 rej
->reason
= cpu_to_be32(
1941 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
1942 pr_err("rejected SRP_LOGIN_REQ because no memory.\n");
1947 kref_init(&ch
->kref
);
1948 ch
->zw_cqe
.done
= srpt_zerolength_write_done
;
1949 INIT_WORK(&ch
->release_work
, srpt_release_channel_work
);
1950 memcpy(ch
->i_port_id
, req
->initiator_port_id
, 16);
1951 memcpy(ch
->t_port_id
, req
->target_port_id
, 16);
1952 ch
->sport
= &sdev
->port
[param
->port
- 1];
1954 cm_id
->context
= ch
;
1956 * Avoid QUEUE_FULL conditions by limiting the number of buffers used
1957 * for the SRP protocol to the command queue size.
1959 ch
->rq_size
= SRPT_RQ_SIZE
;
1960 spin_lock_init(&ch
->spinlock
);
1961 ch
->state
= CH_CONNECTING
;
1962 INIT_LIST_HEAD(&ch
->cmd_wait_list
);
1963 ch
->rsp_size
= ch
->sport
->port_attrib
.srp_max_rsp_size
;
1965 ch
->ioctx_ring
= (struct srpt_send_ioctx
**)
1966 srpt_alloc_ioctx_ring(ch
->sport
->sdev
, ch
->rq_size
,
1967 sizeof(*ch
->ioctx_ring
[0]),
1968 ch
->rsp_size
, DMA_TO_DEVICE
);
1969 if (!ch
->ioctx_ring
)
1972 INIT_LIST_HEAD(&ch
->free_list
);
1973 for (i
= 0; i
< ch
->rq_size
; i
++) {
1974 ch
->ioctx_ring
[i
]->ch
= ch
;
1975 list_add_tail(&ch
->ioctx_ring
[i
]->free_list
, &ch
->free_list
);
1978 ret
= srpt_create_ch_ib(ch
);
1980 rej
->reason
= cpu_to_be32(
1981 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
1982 pr_err("rejected SRP_LOGIN_REQ because creating"
1983 " a new RDMA channel failed.\n");
1987 ret
= srpt_ch_qp_rtr(ch
, ch
->qp
);
1989 rej
->reason
= cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
1990 pr_err("rejected SRP_LOGIN_REQ because enabling"
1991 " RTR failed (error code = %d)\n", ret
);
1995 guid
= (__be16
*)¶m
->primary_path
->sgid
.global
.interface_id
;
1996 snprintf(ch
->ini_guid
, sizeof(ch
->ini_guid
), "%04x:%04x:%04x:%04x",
1997 be16_to_cpu(guid
[0]), be16_to_cpu(guid
[1]),
1998 be16_to_cpu(guid
[2]), be16_to_cpu(guid
[3]));
1999 snprintf(ch
->sess_name
, sizeof(ch
->sess_name
), "0x%016llx%016llx",
2000 be64_to_cpu(*(__be64
*)ch
->i_port_id
),
2001 be64_to_cpu(*(__be64
*)(ch
->i_port_id
+ 8)));
2003 pr_debug("registering session %s\n", ch
->sess_name
);
2005 if (sport
->port_guid_tpg
.se_tpg_wwn
)
2006 ch
->sess
= target_alloc_session(&sport
->port_guid_tpg
, 0, 0,
2008 ch
->ini_guid
, ch
, NULL
);
2009 if (sport
->port_gid_tpg
.se_tpg_wwn
&& IS_ERR_OR_NULL(ch
->sess
))
2010 ch
->sess
= target_alloc_session(&sport
->port_gid_tpg
, 0, 0,
2011 TARGET_PROT_NORMAL
, ch
->sess_name
, ch
,
2013 /* Retry without leading "0x" */
2014 if (sport
->port_gid_tpg
.se_tpg_wwn
&& IS_ERR_OR_NULL(ch
->sess
))
2015 ch
->sess
= target_alloc_session(&sport
->port_gid_tpg
, 0, 0,
2017 ch
->sess_name
+ 2, ch
, NULL
);
2018 if (IS_ERR_OR_NULL(ch
->sess
)) {
2019 pr_info("Rejected login because no ACL has been configured yet for initiator %s.\n",
2021 rej
->reason
= cpu_to_be32((PTR_ERR(ch
->sess
) == -ENOMEM
) ?
2022 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
:
2023 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED
);
2027 pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch
->sess
,
2028 ch
->sess_name
, ch
->cm_id
);
2030 /* create srp_login_response */
2031 rsp
->opcode
= SRP_LOGIN_RSP
;
2032 rsp
->tag
= req
->tag
;
2033 rsp
->max_it_iu_len
= req
->req_it_iu_len
;
2034 rsp
->max_ti_iu_len
= req
->req_it_iu_len
;
2035 ch
->max_ti_iu_len
= it_iu_len
;
2036 rsp
->buf_fmt
= cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2037 | SRP_BUF_FORMAT_INDIRECT
);
2038 rsp
->req_lim_delta
= cpu_to_be32(ch
->rq_size
);
2039 atomic_set(&ch
->req_lim
, ch
->rq_size
);
2040 atomic_set(&ch
->req_lim_delta
, 0);
2042 /* create cm reply */
2043 rep_param
->qp_num
= ch
->qp
->qp_num
;
2044 rep_param
->private_data
= (void *)rsp
;
2045 rep_param
->private_data_len
= sizeof(*rsp
);
2046 rep_param
->rnr_retry_count
= 7;
2047 rep_param
->flow_control
= 1;
2048 rep_param
->failover_accepted
= 0;
2050 rep_param
->responder_resources
= 4;
2051 rep_param
->initiator_depth
= 4;
2053 ret
= ib_send_cm_rep(cm_id
, rep_param
);
2055 pr_err("sending SRP_LOGIN_REQ response failed"
2056 " (error code = %d)\n", ret
);
2057 goto release_channel
;
2060 mutex_lock(&sdev
->mutex
);
2061 list_add_tail(&ch
->list
, &sdev
->rch_list
);
2062 mutex_unlock(&sdev
->mutex
);
2067 srpt_disconnect_ch(ch
);
2068 transport_deregister_session_configfs(ch
->sess
);
2069 transport_deregister_session(ch
->sess
);
2073 srpt_destroy_ch_ib(ch
);
2076 srpt_free_ioctx_ring((struct srpt_ioctx
**)ch
->ioctx_ring
,
2077 ch
->sport
->sdev
, ch
->rq_size
,
2078 ch
->rsp_size
, DMA_TO_DEVICE
);
2083 rej
->opcode
= SRP_LOGIN_REJ
;
2084 rej
->tag
= req
->tag
;
2085 rej
->buf_fmt
= cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2086 | SRP_BUF_FORMAT_INDIRECT
);
2088 ib_send_cm_rej(cm_id
, IB_CM_REJ_CONSUMER_DEFINED
, NULL
, 0,
2089 (void *)rej
, sizeof(*rej
));
2099 static void srpt_cm_rej_recv(struct srpt_rdma_ch
*ch
,
2100 enum ib_cm_rej_reason reason
,
2101 const u8
*private_data
,
2102 u8 private_data_len
)
2107 if (private_data_len
&& (priv
= kmalloc(private_data_len
* 3 + 1,
2109 for (i
= 0; i
< private_data_len
; i
++)
2110 sprintf(priv
+ 3 * i
, " %02x", private_data
[i
]);
2112 pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n",
2113 ch
->sess_name
, ch
->qp
->qp_num
, reason
, private_data_len
?
2114 "; private data" : "", priv
? priv
: " (?)");
2119 * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event.
2121 * An IB_CM_RTU_RECEIVED message indicates that the connection is established
2122 * and that the recipient may begin transmitting (RTU = ready to use).
2124 static void srpt_cm_rtu_recv(struct srpt_rdma_ch
*ch
)
2128 if (srpt_set_ch_state(ch
, CH_LIVE
)) {
2129 ret
= srpt_ch_qp_rts(ch
, ch
->qp
);
2132 /* Trigger wait list processing. */
2133 ret
= srpt_zerolength_write(ch
);
2134 WARN_ONCE(ret
< 0, "%d\n", ret
);
2142 * srpt_cm_handler() - IB connection manager callback function.
2144 * A non-zero return value will cause the caller destroy the CM ID.
2146 * Note: srpt_cm_handler() must only return a non-zero value when transferring
2147 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
2148 * a non-zero value in any other case will trigger a race with the
2149 * ib_destroy_cm_id() call in srpt_release_channel().
2151 static int srpt_cm_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
)
2153 struct srpt_rdma_ch
*ch
= cm_id
->context
;
2157 switch (event
->event
) {
2158 case IB_CM_REQ_RECEIVED
:
2159 ret
= srpt_cm_req_recv(cm_id
, &event
->param
.req_rcvd
,
2160 event
->private_data
);
2162 case IB_CM_REJ_RECEIVED
:
2163 srpt_cm_rej_recv(ch
, event
->param
.rej_rcvd
.reason
,
2164 event
->private_data
,
2165 IB_CM_REJ_PRIVATE_DATA_SIZE
);
2167 case IB_CM_RTU_RECEIVED
:
2168 case IB_CM_USER_ESTABLISHED
:
2169 srpt_cm_rtu_recv(ch
);
2171 case IB_CM_DREQ_RECEIVED
:
2172 srpt_disconnect_ch(ch
);
2174 case IB_CM_DREP_RECEIVED
:
2175 pr_info("Received CM DREP message for ch %s-%d.\n",
2176 ch
->sess_name
, ch
->qp
->qp_num
);
2179 case IB_CM_TIMEWAIT_EXIT
:
2180 pr_info("Received CM TimeWait exit for ch %s-%d.\n",
2181 ch
->sess_name
, ch
->qp
->qp_num
);
2184 case IB_CM_REP_ERROR
:
2185 pr_info("Received CM REP error for ch %s-%d.\n", ch
->sess_name
,
2188 case IB_CM_DREQ_ERROR
:
2189 pr_info("Received CM DREQ ERROR event.\n");
2191 case IB_CM_MRA_RECEIVED
:
2192 pr_info("Received CM MRA event\n");
2195 pr_err("received unrecognized CM event %d\n", event
->event
);
2202 static int srpt_write_pending_status(struct se_cmd
*se_cmd
)
2204 struct srpt_send_ioctx
*ioctx
;
2206 ioctx
= container_of(se_cmd
, struct srpt_send_ioctx
, cmd
);
2207 return srpt_get_cmd_state(ioctx
) == SRPT_STATE_NEED_DATA
;
2211 * srpt_write_pending() - Start data transfer from initiator to target (write).
2213 static int srpt_write_pending(struct se_cmd
*se_cmd
)
2215 struct srpt_send_ioctx
*ioctx
=
2216 container_of(se_cmd
, struct srpt_send_ioctx
, cmd
);
2217 struct srpt_rdma_ch
*ch
= ioctx
->ch
;
2218 struct ib_send_wr
*first_wr
= NULL
, *bad_wr
;
2219 struct ib_cqe
*cqe
= &ioctx
->rdma_cqe
;
2220 enum srpt_command_state new_state
;
2223 new_state
= srpt_set_cmd_state(ioctx
, SRPT_STATE_NEED_DATA
);
2224 WARN_ON(new_state
== SRPT_STATE_DONE
);
2226 if (atomic_sub_return(ioctx
->n_rdma
, &ch
->sq_wr_avail
) < 0) {
2227 pr_warn("%s: IB send queue full (needed %d)\n",
2228 __func__
, ioctx
->n_rdma
);
2233 cqe
->done
= srpt_rdma_read_done
;
2234 for (i
= ioctx
->n_rw_ctx
- 1; i
>= 0; i
--) {
2235 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
2237 first_wr
= rdma_rw_ctx_wrs(&ctx
->rw
, ch
->qp
, ch
->sport
->port
,
2242 ret
= ib_post_send(ch
->qp
, first_wr
, &bad_wr
);
2244 pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n",
2245 __func__
, ret
, ioctx
->n_rdma
,
2246 atomic_read(&ch
->sq_wr_avail
));
2252 atomic_add(ioctx
->n_rdma
, &ch
->sq_wr_avail
);
2256 static u8
tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status
)
2258 switch (tcm_mgmt_status
) {
2259 case TMR_FUNCTION_COMPLETE
:
2260 return SRP_TSK_MGMT_SUCCESS
;
2261 case TMR_FUNCTION_REJECTED
:
2262 return SRP_TSK_MGMT_FUNC_NOT_SUPP
;
2264 return SRP_TSK_MGMT_FAILED
;
2268 * srpt_queue_response() - Transmits the response to a SCSI command.
2270 * Callback function called by the TCM core. Must not block since it can be
2271 * invoked on the context of the IB completion handler.
2273 static void srpt_queue_response(struct se_cmd
*cmd
)
2275 struct srpt_send_ioctx
*ioctx
=
2276 container_of(cmd
, struct srpt_send_ioctx
, cmd
);
2277 struct srpt_rdma_ch
*ch
= ioctx
->ch
;
2278 struct srpt_device
*sdev
= ch
->sport
->sdev
;
2279 struct ib_send_wr send_wr
, *first_wr
= &send_wr
, *bad_wr
;
2281 enum srpt_command_state state
;
2282 unsigned long flags
;
2283 int resp_len
, ret
, i
;
2288 spin_lock_irqsave(&ioctx
->spinlock
, flags
);
2289 state
= ioctx
->state
;
2291 case SRPT_STATE_NEW
:
2292 case SRPT_STATE_DATA_IN
:
2293 ioctx
->state
= SRPT_STATE_CMD_RSP_SENT
;
2295 case SRPT_STATE_MGMT
:
2296 ioctx
->state
= SRPT_STATE_MGMT_RSP_SENT
;
2299 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
2300 ch
, ioctx
->ioctx
.index
, ioctx
->state
);
2303 spin_unlock_irqrestore(&ioctx
->spinlock
, flags
);
2305 if (unlikely(transport_check_aborted_status(&ioctx
->cmd
, false)
2306 || WARN_ON_ONCE(state
== SRPT_STATE_CMD_RSP_SENT
))) {
2307 atomic_inc(&ch
->req_lim_delta
);
2308 srpt_abort_cmd(ioctx
);
2312 /* For read commands, transfer the data to the initiator. */
2313 if (ioctx
->cmd
.data_direction
== DMA_FROM_DEVICE
&&
2314 ioctx
->cmd
.data_length
&&
2315 !ioctx
->queue_status_only
) {
2316 for (i
= ioctx
->n_rw_ctx
- 1; i
>= 0; i
--) {
2317 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
2319 first_wr
= rdma_rw_ctx_wrs(&ctx
->rw
, ch
->qp
,
2320 ch
->sport
->port
, NULL
, first_wr
);
2324 if (state
!= SRPT_STATE_MGMT
)
2325 resp_len
= srpt_build_cmd_rsp(ch
, ioctx
, ioctx
->cmd
.tag
,
2329 = tcm_to_srp_tsk_mgmt_status(cmd
->se_tmr_req
->response
);
2330 resp_len
= srpt_build_tskmgmt_rsp(ch
, ioctx
, srp_tm_status
,
2334 atomic_inc(&ch
->req_lim
);
2336 if (unlikely(atomic_sub_return(1 + ioctx
->n_rdma
,
2337 &ch
->sq_wr_avail
) < 0)) {
2338 pr_warn("%s: IB send queue full (needed %d)\n",
2339 __func__
, ioctx
->n_rdma
);
2344 ib_dma_sync_single_for_device(sdev
->device
, ioctx
->ioctx
.dma
, resp_len
,
2347 sge
.addr
= ioctx
->ioctx
.dma
;
2348 sge
.length
= resp_len
;
2349 sge
.lkey
= sdev
->pd
->local_dma_lkey
;
2351 ioctx
->ioctx
.cqe
.done
= srpt_send_done
;
2352 send_wr
.next
= NULL
;
2353 send_wr
.wr_cqe
= &ioctx
->ioctx
.cqe
;
2354 send_wr
.sg_list
= &sge
;
2355 send_wr
.num_sge
= 1;
2356 send_wr
.opcode
= IB_WR_SEND
;
2357 send_wr
.send_flags
= IB_SEND_SIGNALED
;
2359 ret
= ib_post_send(ch
->qp
, first_wr
, &bad_wr
);
2361 pr_err("%s: sending cmd response failed for tag %llu (%d)\n",
2362 __func__
, ioctx
->cmd
.tag
, ret
);
2369 atomic_add(1 + ioctx
->n_rdma
, &ch
->sq_wr_avail
);
2370 atomic_dec(&ch
->req_lim
);
2371 srpt_set_cmd_state(ioctx
, SRPT_STATE_DONE
);
2372 target_put_sess_cmd(&ioctx
->cmd
);
2375 static int srpt_queue_data_in(struct se_cmd
*cmd
)
2377 srpt_queue_response(cmd
);
2381 static void srpt_queue_tm_rsp(struct se_cmd
*cmd
)
2383 srpt_queue_response(cmd
);
2386 static void srpt_aborted_task(struct se_cmd
*cmd
)
2390 static int srpt_queue_status(struct se_cmd
*cmd
)
2392 struct srpt_send_ioctx
*ioctx
;
2394 ioctx
= container_of(cmd
, struct srpt_send_ioctx
, cmd
);
2395 BUG_ON(ioctx
->sense_data
!= cmd
->sense_buffer
);
2396 if (cmd
->se_cmd_flags
&
2397 (SCF_TRANSPORT_TASK_SENSE
| SCF_EMULATED_TASK_SENSE
))
2398 WARN_ON(cmd
->scsi_status
!= SAM_STAT_CHECK_CONDITION
);
2399 ioctx
->queue_status_only
= true;
2400 srpt_queue_response(cmd
);
2404 static void srpt_refresh_port_work(struct work_struct
*work
)
2406 struct srpt_port
*sport
= container_of(work
, struct srpt_port
, work
);
2408 srpt_refresh_port(sport
);
2412 * srpt_release_sdev() - Free the channel resources associated with a target.
2414 static int srpt_release_sdev(struct srpt_device
*sdev
)
2418 WARN_ON_ONCE(irqs_disabled());
2422 mutex_lock(&sdev
->mutex
);
2423 for (i
= 0; i
< ARRAY_SIZE(sdev
->port
); i
++)
2424 sdev
->port
[i
].enabled
= false;
2425 __srpt_close_all_ch(sdev
);
2426 mutex_unlock(&sdev
->mutex
);
2428 res
= wait_event_interruptible(sdev
->ch_releaseQ
,
2429 list_empty_careful(&sdev
->rch_list
));
2431 pr_err("%s: interrupted.\n", __func__
);
2436 static struct se_wwn
*__srpt_lookup_wwn(const char *name
)
2438 struct ib_device
*dev
;
2439 struct srpt_device
*sdev
;
2440 struct srpt_port
*sport
;
2443 list_for_each_entry(sdev
, &srpt_dev_list
, list
) {
2448 for (i
= 0; i
< dev
->phys_port_cnt
; i
++) {
2449 sport
= &sdev
->port
[i
];
2451 if (strcmp(sport
->port_guid
, name
) == 0)
2452 return &sport
->port_guid_wwn
;
2453 if (strcmp(sport
->port_gid
, name
) == 0)
2454 return &sport
->port_gid_wwn
;
2461 static struct se_wwn
*srpt_lookup_wwn(const char *name
)
2465 spin_lock(&srpt_dev_lock
);
2466 wwn
= __srpt_lookup_wwn(name
);
2467 spin_unlock(&srpt_dev_lock
);
2473 * srpt_add_one() - Infiniband device addition callback function.
2475 static void srpt_add_one(struct ib_device
*device
)
2477 struct srpt_device
*sdev
;
2478 struct srpt_port
*sport
;
2479 struct ib_srq_init_attr srq_attr
;
2482 pr_debug("device = %p\n", device
);
2484 sdev
= kzalloc(sizeof(*sdev
), GFP_KERNEL
);
2488 sdev
->device
= device
;
2489 INIT_LIST_HEAD(&sdev
->rch_list
);
2490 init_waitqueue_head(&sdev
->ch_releaseQ
);
2491 mutex_init(&sdev
->mutex
);
2493 sdev
->pd
= ib_alloc_pd(device
, 0);
2494 if (IS_ERR(sdev
->pd
))
2497 sdev
->srq_size
= min(srpt_srq_size
, sdev
->device
->attrs
.max_srq_wr
);
2499 srq_attr
.event_handler
= srpt_srq_event
;
2500 srq_attr
.srq_context
= (void *)sdev
;
2501 srq_attr
.attr
.max_wr
= sdev
->srq_size
;
2502 srq_attr
.attr
.max_sge
= 1;
2503 srq_attr
.attr
.srq_limit
= 0;
2504 srq_attr
.srq_type
= IB_SRQT_BASIC
;
2506 sdev
->srq
= ib_create_srq(sdev
->pd
, &srq_attr
);
2507 if (IS_ERR(sdev
->srq
))
2510 pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n",
2511 __func__
, sdev
->srq_size
, sdev
->device
->attrs
.max_srq_wr
,
2514 if (!srpt_service_guid
)
2515 srpt_service_guid
= be64_to_cpu(device
->node_guid
);
2517 sdev
->cm_id
= ib_create_cm_id(device
, srpt_cm_handler
, sdev
);
2518 if (IS_ERR(sdev
->cm_id
))
2521 /* print out target login information */
2522 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,"
2523 "pkey=ffff,service_id=%016llx\n", srpt_service_guid
,
2524 srpt_service_guid
, srpt_service_guid
);
2527 * We do not have a consistent service_id (ie. also id_ext of target_id)
2528 * to identify this target. We currently use the guid of the first HCA
2529 * in the system as service_id; therefore, the target_id will change
2530 * if this HCA is gone bad and replaced by different HCA
2532 if (ib_cm_listen(sdev
->cm_id
, cpu_to_be64(srpt_service_guid
), 0))
2535 INIT_IB_EVENT_HANDLER(&sdev
->event_handler
, sdev
->device
,
2536 srpt_event_handler
);
2537 if (ib_register_event_handler(&sdev
->event_handler
))
2540 sdev
->ioctx_ring
= (struct srpt_recv_ioctx
**)
2541 srpt_alloc_ioctx_ring(sdev
, sdev
->srq_size
,
2542 sizeof(*sdev
->ioctx_ring
[0]),
2543 srp_max_req_size
, DMA_FROM_DEVICE
);
2544 if (!sdev
->ioctx_ring
)
2547 for (i
= 0; i
< sdev
->srq_size
; ++i
)
2548 srpt_post_recv(sdev
, sdev
->ioctx_ring
[i
]);
2550 WARN_ON(sdev
->device
->phys_port_cnt
> ARRAY_SIZE(sdev
->port
));
2552 for (i
= 1; i
<= sdev
->device
->phys_port_cnt
; i
++) {
2553 sport
= &sdev
->port
[i
- 1];
2556 sport
->port_attrib
.srp_max_rdma_size
= DEFAULT_MAX_RDMA_SIZE
;
2557 sport
->port_attrib
.srp_max_rsp_size
= DEFAULT_MAX_RSP_SIZE
;
2558 sport
->port_attrib
.srp_sq_size
= DEF_SRPT_SQ_SIZE
;
2559 INIT_WORK(&sport
->work
, srpt_refresh_port_work
);
2561 if (srpt_refresh_port(sport
)) {
2562 pr_err("MAD registration failed for %s-%d.\n",
2563 sdev
->device
->name
, i
);
2568 spin_lock(&srpt_dev_lock
);
2569 list_add_tail(&sdev
->list
, &srpt_dev_list
);
2570 spin_unlock(&srpt_dev_lock
);
2573 ib_set_client_data(device
, &srpt_client
, sdev
);
2574 pr_debug("added %s.\n", device
->name
);
2578 srpt_free_ioctx_ring((struct srpt_ioctx
**)sdev
->ioctx_ring
, sdev
,
2579 sdev
->srq_size
, srp_max_req_size
,
2582 ib_unregister_event_handler(&sdev
->event_handler
);
2584 ib_destroy_cm_id(sdev
->cm_id
);
2586 ib_destroy_srq(sdev
->srq
);
2588 ib_dealloc_pd(sdev
->pd
);
2593 pr_info("%s(%s) failed.\n", __func__
, device
->name
);
2598 * srpt_remove_one() - InfiniBand device removal callback function.
2600 static void srpt_remove_one(struct ib_device
*device
, void *client_data
)
2602 struct srpt_device
*sdev
= client_data
;
2606 pr_info("%s(%s): nothing to do.\n", __func__
, device
->name
);
2610 srpt_unregister_mad_agent(sdev
);
2612 ib_unregister_event_handler(&sdev
->event_handler
);
2614 /* Cancel any work queued by the just unregistered IB event handler. */
2615 for (i
= 0; i
< sdev
->device
->phys_port_cnt
; i
++)
2616 cancel_work_sync(&sdev
->port
[i
].work
);
2618 ib_destroy_cm_id(sdev
->cm_id
);
2621 * Unregistering a target must happen after destroying sdev->cm_id
2622 * such that no new SRP_LOGIN_REQ information units can arrive while
2623 * destroying the target.
2625 spin_lock(&srpt_dev_lock
);
2626 list_del(&sdev
->list
);
2627 spin_unlock(&srpt_dev_lock
);
2628 srpt_release_sdev(sdev
);
2630 ib_destroy_srq(sdev
->srq
);
2631 ib_dealloc_pd(sdev
->pd
);
2633 srpt_free_ioctx_ring((struct srpt_ioctx
**)sdev
->ioctx_ring
, sdev
,
2634 sdev
->srq_size
, srp_max_req_size
, DMA_FROM_DEVICE
);
2635 sdev
->ioctx_ring
= NULL
;
2639 static struct ib_client srpt_client
= {
2641 .add
= srpt_add_one
,
2642 .remove
= srpt_remove_one
2645 static int srpt_check_true(struct se_portal_group
*se_tpg
)
2650 static int srpt_check_false(struct se_portal_group
*se_tpg
)
2655 static char *srpt_get_fabric_name(void)
2660 static struct srpt_port
*srpt_tpg_to_sport(struct se_portal_group
*tpg
)
2662 return tpg
->se_tpg_wwn
->priv
;
2665 static char *srpt_get_fabric_wwn(struct se_portal_group
*tpg
)
2667 struct srpt_port
*sport
= srpt_tpg_to_sport(tpg
);
2669 WARN_ON_ONCE(tpg
!= &sport
->port_guid_tpg
&&
2670 tpg
!= &sport
->port_gid_tpg
);
2671 return tpg
== &sport
->port_guid_tpg
? sport
->port_guid
:
2675 static u16
srpt_get_tag(struct se_portal_group
*tpg
)
2680 static u32
srpt_tpg_get_inst_index(struct se_portal_group
*se_tpg
)
2685 static void srpt_release_cmd(struct se_cmd
*se_cmd
)
2687 struct srpt_send_ioctx
*ioctx
= container_of(se_cmd
,
2688 struct srpt_send_ioctx
, cmd
);
2689 struct srpt_rdma_ch
*ch
= ioctx
->ch
;
2690 unsigned long flags
;
2692 WARN_ON(ioctx
->state
!= SRPT_STATE_DONE
);
2694 if (ioctx
->n_rw_ctx
) {
2695 srpt_free_rw_ctxs(ch
, ioctx
);
2696 ioctx
->n_rw_ctx
= 0;
2699 spin_lock_irqsave(&ch
->spinlock
, flags
);
2700 list_add(&ioctx
->free_list
, &ch
->free_list
);
2701 spin_unlock_irqrestore(&ch
->spinlock
, flags
);
2705 * srpt_close_session() - Forcibly close a session.
2707 * Callback function invoked by the TCM core to clean up sessions associated
2708 * with a node ACL when the user invokes
2709 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
2711 static void srpt_close_session(struct se_session
*se_sess
)
2713 DECLARE_COMPLETION_ONSTACK(release_done
);
2714 struct srpt_rdma_ch
*ch
= se_sess
->fabric_sess_ptr
;
2715 struct srpt_device
*sdev
= ch
->sport
->sdev
;
2718 pr_debug("ch %s-%d state %d\n", ch
->sess_name
, ch
->qp
->qp_num
,
2721 mutex_lock(&sdev
->mutex
);
2722 BUG_ON(ch
->release_done
);
2723 ch
->release_done
= &release_done
;
2724 wait
= !list_empty(&ch
->list
);
2725 srpt_disconnect_ch(ch
);
2726 mutex_unlock(&sdev
->mutex
);
2731 while (wait_for_completion_timeout(&release_done
, 180 * HZ
) == 0)
2732 pr_info("%s(%s-%d state %d): still waiting ...\n", __func__
,
2733 ch
->sess_name
, ch
->qp
->qp_num
, ch
->state
);
2737 * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB).
2739 * A quote from RFC 4455 (SCSI-MIB) about this MIB object:
2740 * This object represents an arbitrary integer used to uniquely identify a
2741 * particular attached remote initiator port to a particular SCSI target port
2742 * within a particular SCSI target device within a particular SCSI instance.
2744 static u32
srpt_sess_get_index(struct se_session
*se_sess
)
2749 static void srpt_set_default_node_attrs(struct se_node_acl
*nacl
)
2753 /* Note: only used from inside debug printk's by the TCM core. */
2754 static int srpt_get_tcm_cmd_state(struct se_cmd
*se_cmd
)
2756 struct srpt_send_ioctx
*ioctx
;
2758 ioctx
= container_of(se_cmd
, struct srpt_send_ioctx
, cmd
);
2759 return srpt_get_cmd_state(ioctx
);
2762 static int srpt_parse_guid(u64
*guid
, const char *name
)
2767 if (sscanf(name
, "%hx:%hx:%hx:%hx", &w
[0], &w
[1], &w
[2], &w
[3]) != 4)
2769 *guid
= get_unaligned_be64(w
);
2776 * srpt_parse_i_port_id() - Parse an initiator port ID.
2777 * @name: ASCII representation of a 128-bit initiator port ID.
2778 * @i_port_id: Binary 128-bit port ID.
2780 static int srpt_parse_i_port_id(u8 i_port_id
[16], const char *name
)
2783 unsigned len
, count
, leading_zero_bytes
;
2787 if (strncasecmp(p
, "0x", 2) == 0)
2793 count
= min(len
/ 2, 16U);
2794 leading_zero_bytes
= 16 - count
;
2795 memset(i_port_id
, 0, leading_zero_bytes
);
2796 rc
= hex2bin(i_port_id
+ leading_zero_bytes
, p
, count
);
2798 pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", rc
);
2805 * configfs callback function invoked for
2806 * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
2808 static int srpt_init_nodeacl(struct se_node_acl
*se_nacl
, const char *name
)
2814 ret
= srpt_parse_guid(&guid
, name
);
2816 ret
= srpt_parse_i_port_id(i_port_id
, name
);
2818 pr_err("invalid initiator port ID %s\n", name
);
2822 static ssize_t
srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item
*item
,
2825 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
2826 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
2828 return sprintf(page
, "%u\n", sport
->port_attrib
.srp_max_rdma_size
);
2831 static ssize_t
srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item
*item
,
2832 const char *page
, size_t count
)
2834 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
2835 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
2839 ret
= kstrtoul(page
, 0, &val
);
2841 pr_err("kstrtoul() failed with ret: %d\n", ret
);
2844 if (val
> MAX_SRPT_RDMA_SIZE
) {
2845 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val
,
2846 MAX_SRPT_RDMA_SIZE
);
2849 if (val
< DEFAULT_MAX_RDMA_SIZE
) {
2850 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
2851 val
, DEFAULT_MAX_RDMA_SIZE
);
2854 sport
->port_attrib
.srp_max_rdma_size
= val
;
2859 static ssize_t
srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item
*item
,
2862 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
2863 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
2865 return sprintf(page
, "%u\n", sport
->port_attrib
.srp_max_rsp_size
);
2868 static ssize_t
srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item
*item
,
2869 const char *page
, size_t count
)
2871 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
2872 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
2876 ret
= kstrtoul(page
, 0, &val
);
2878 pr_err("kstrtoul() failed with ret: %d\n", ret
);
2881 if (val
> MAX_SRPT_RSP_SIZE
) {
2882 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val
,
2886 if (val
< MIN_MAX_RSP_SIZE
) {
2887 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val
,
2891 sport
->port_attrib
.srp_max_rsp_size
= val
;
2896 static ssize_t
srpt_tpg_attrib_srp_sq_size_show(struct config_item
*item
,
2899 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
2900 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
2902 return sprintf(page
, "%u\n", sport
->port_attrib
.srp_sq_size
);
2905 static ssize_t
srpt_tpg_attrib_srp_sq_size_store(struct config_item
*item
,
2906 const char *page
, size_t count
)
2908 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
2909 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
2913 ret
= kstrtoul(page
, 0, &val
);
2915 pr_err("kstrtoul() failed with ret: %d\n", ret
);
2918 if (val
> MAX_SRPT_SRQ_SIZE
) {
2919 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val
,
2923 if (val
< MIN_SRPT_SRQ_SIZE
) {
2924 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val
,
2928 sport
->port_attrib
.srp_sq_size
= val
;
2933 CONFIGFS_ATTR(srpt_tpg_attrib_
, srp_max_rdma_size
);
2934 CONFIGFS_ATTR(srpt_tpg_attrib_
, srp_max_rsp_size
);
2935 CONFIGFS_ATTR(srpt_tpg_attrib_
, srp_sq_size
);
2937 static struct configfs_attribute
*srpt_tpg_attrib_attrs
[] = {
2938 &srpt_tpg_attrib_attr_srp_max_rdma_size
,
2939 &srpt_tpg_attrib_attr_srp_max_rsp_size
,
2940 &srpt_tpg_attrib_attr_srp_sq_size
,
2944 static ssize_t
srpt_tpg_enable_show(struct config_item
*item
, char *page
)
2946 struct se_portal_group
*se_tpg
= to_tpg(item
);
2947 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
2949 return snprintf(page
, PAGE_SIZE
, "%d\n", (sport
->enabled
) ? 1: 0);
2952 static ssize_t
srpt_tpg_enable_store(struct config_item
*item
,
2953 const char *page
, size_t count
)
2955 struct se_portal_group
*se_tpg
= to_tpg(item
);
2956 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
2957 struct srpt_device
*sdev
= sport
->sdev
;
2958 struct srpt_rdma_ch
*ch
;
2962 ret
= kstrtoul(page
, 0, &tmp
);
2964 pr_err("Unable to extract srpt_tpg_store_enable\n");
2968 if ((tmp
!= 0) && (tmp
!= 1)) {
2969 pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp
);
2972 if (sport
->enabled
== tmp
)
2974 sport
->enabled
= tmp
;
2978 mutex_lock(&sdev
->mutex
);
2979 list_for_each_entry(ch
, &sdev
->rch_list
, list
) {
2980 if (ch
->sport
== sport
) {
2981 pr_debug("%s: ch %p %s-%d\n", __func__
, ch
,
2982 ch
->sess_name
, ch
->qp
->qp_num
);
2983 srpt_disconnect_ch(ch
);
2987 mutex_unlock(&sdev
->mutex
);
2993 CONFIGFS_ATTR(srpt_tpg_
, enable
);
2995 static struct configfs_attribute
*srpt_tpg_attrs
[] = {
2996 &srpt_tpg_attr_enable
,
3001 * configfs callback invoked for
3002 * mkdir /sys/kernel/config/target/$driver/$port/$tpg
3004 static struct se_portal_group
*srpt_make_tpg(struct se_wwn
*wwn
,
3005 struct config_group
*group
,
3008 struct srpt_port
*sport
= wwn
->priv
;
3009 static struct se_portal_group
*tpg
;
3012 WARN_ON_ONCE(wwn
!= &sport
->port_guid_wwn
&&
3013 wwn
!= &sport
->port_gid_wwn
);
3014 tpg
= wwn
== &sport
->port_guid_wwn
? &sport
->port_guid_tpg
:
3015 &sport
->port_gid_tpg
;
3016 res
= core_tpg_register(wwn
, tpg
, SCSI_PROTOCOL_SRP
);
3018 return ERR_PTR(res
);
3024 * configfs callback invoked for
3025 * rmdir /sys/kernel/config/target/$driver/$port/$tpg
3027 static void srpt_drop_tpg(struct se_portal_group
*tpg
)
3029 struct srpt_port
*sport
= srpt_tpg_to_sport(tpg
);
3031 sport
->enabled
= false;
3032 core_tpg_deregister(tpg
);
3036 * configfs callback invoked for
3037 * mkdir /sys/kernel/config/target/$driver/$port
3039 static struct se_wwn
*srpt_make_tport(struct target_fabric_configfs
*tf
,
3040 struct config_group
*group
,
3043 return srpt_lookup_wwn(name
) ? : ERR_PTR(-EINVAL
);
3047 * configfs callback invoked for
3048 * rmdir /sys/kernel/config/target/$driver/$port
3050 static void srpt_drop_tport(struct se_wwn
*wwn
)
3054 static ssize_t
srpt_wwn_version_show(struct config_item
*item
, char *buf
)
3056 return scnprintf(buf
, PAGE_SIZE
, "%s\n", DRV_VERSION
);
3059 CONFIGFS_ATTR_RO(srpt_wwn_
, version
);
3061 static struct configfs_attribute
*srpt_wwn_attrs
[] = {
3062 &srpt_wwn_attr_version
,
3066 static const struct target_core_fabric_ops srpt_template
= {
3067 .module
= THIS_MODULE
,
3069 .get_fabric_name
= srpt_get_fabric_name
,
3070 .tpg_get_wwn
= srpt_get_fabric_wwn
,
3071 .tpg_get_tag
= srpt_get_tag
,
3072 .tpg_check_demo_mode
= srpt_check_false
,
3073 .tpg_check_demo_mode_cache
= srpt_check_true
,
3074 .tpg_check_demo_mode_write_protect
= srpt_check_true
,
3075 .tpg_check_prod_mode_write_protect
= srpt_check_false
,
3076 .tpg_get_inst_index
= srpt_tpg_get_inst_index
,
3077 .release_cmd
= srpt_release_cmd
,
3078 .check_stop_free
= srpt_check_stop_free
,
3079 .close_session
= srpt_close_session
,
3080 .sess_get_index
= srpt_sess_get_index
,
3081 .sess_get_initiator_sid
= NULL
,
3082 .write_pending
= srpt_write_pending
,
3083 .write_pending_status
= srpt_write_pending_status
,
3084 .set_default_node_attributes
= srpt_set_default_node_attrs
,
3085 .get_cmd_state
= srpt_get_tcm_cmd_state
,
3086 .queue_data_in
= srpt_queue_data_in
,
3087 .queue_status
= srpt_queue_status
,
3088 .queue_tm_rsp
= srpt_queue_tm_rsp
,
3089 .aborted_task
= srpt_aborted_task
,
3091 * Setup function pointers for generic logic in
3092 * target_core_fabric_configfs.c
3094 .fabric_make_wwn
= srpt_make_tport
,
3095 .fabric_drop_wwn
= srpt_drop_tport
,
3096 .fabric_make_tpg
= srpt_make_tpg
,
3097 .fabric_drop_tpg
= srpt_drop_tpg
,
3098 .fabric_init_nodeacl
= srpt_init_nodeacl
,
3100 .tfc_wwn_attrs
= srpt_wwn_attrs
,
3101 .tfc_tpg_base_attrs
= srpt_tpg_attrs
,
3102 .tfc_tpg_attrib_attrs
= srpt_tpg_attrib_attrs
,
3106 * srpt_init_module() - Kernel module initialization.
3108 * Note: Since ib_register_client() registers callback functions, and since at
3109 * least one of these callback functions (srpt_add_one()) calls target core
3110 * functions, this driver must be registered with the target core before
3111 * ib_register_client() is called.
3113 static int __init
srpt_init_module(void)
3118 if (srp_max_req_size
< MIN_MAX_REQ_SIZE
) {
3119 pr_err("invalid value %d for kernel module parameter"
3120 " srp_max_req_size -- must be at least %d.\n",
3121 srp_max_req_size
, MIN_MAX_REQ_SIZE
);
3125 if (srpt_srq_size
< MIN_SRPT_SRQ_SIZE
3126 || srpt_srq_size
> MAX_SRPT_SRQ_SIZE
) {
3127 pr_err("invalid value %d for kernel module parameter"
3128 " srpt_srq_size -- must be in the range [%d..%d].\n",
3129 srpt_srq_size
, MIN_SRPT_SRQ_SIZE
, MAX_SRPT_SRQ_SIZE
);
3133 ret
= target_register_template(&srpt_template
);
3137 ret
= ib_register_client(&srpt_client
);
3139 pr_err("couldn't register IB client\n");
3140 goto out_unregister_target
;
3145 out_unregister_target
:
3146 target_unregister_template(&srpt_template
);
3151 static void __exit
srpt_cleanup_module(void)
3153 ib_unregister_client(&srpt_client
);
3154 target_unregister_template(&srpt_template
);
3157 module_init(srpt_init_module
);
3158 module_exit(srpt_cleanup_module
);