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
;
505 memset(&port_modify
, 0, sizeof(port_modify
));
506 port_modify
.set_port_cap_mask
= IB_PORT_DEVICE_MGMT_SUP
;
507 port_modify
.clr_port_cap_mask
= 0;
509 ret
= ib_modify_port(sport
->sdev
->device
, sport
->port
, 0, &port_modify
);
513 ret
= ib_query_port(sport
->sdev
->device
, sport
->port
, &port_attr
);
517 sport
->sm_lid
= port_attr
.sm_lid
;
518 sport
->lid
= port_attr
.lid
;
520 ret
= ib_query_gid(sport
->sdev
->device
, sport
->port
, 0, &sport
->gid
,
525 snprintf(sport
->port_guid
, sizeof(sport
->port_guid
),
527 be64_to_cpu(sport
->gid
.global
.subnet_prefix
),
528 be64_to_cpu(sport
->gid
.global
.interface_id
));
530 if (!sport
->mad_agent
) {
531 memset(®_req
, 0, sizeof(reg_req
));
532 reg_req
.mgmt_class
= IB_MGMT_CLASS_DEVICE_MGMT
;
533 reg_req
.mgmt_class_version
= IB_MGMT_BASE_VERSION
;
534 set_bit(IB_MGMT_METHOD_GET
, reg_req
.method_mask
);
535 set_bit(IB_MGMT_METHOD_SET
, reg_req
.method_mask
);
537 sport
->mad_agent
= ib_register_mad_agent(sport
->sdev
->device
,
541 srpt_mad_send_handler
,
542 srpt_mad_recv_handler
,
544 if (IS_ERR(sport
->mad_agent
)) {
545 ret
= PTR_ERR(sport
->mad_agent
);
546 sport
->mad_agent
= NULL
;
555 port_modify
.set_port_cap_mask
= 0;
556 port_modify
.clr_port_cap_mask
= IB_PORT_DEVICE_MGMT_SUP
;
557 ib_modify_port(sport
->sdev
->device
, sport
->port
, 0, &port_modify
);
565 * srpt_unregister_mad_agent() - Unregister MAD callback functions.
567 * Note: It is safe to call this function more than once for the same device.
569 static void srpt_unregister_mad_agent(struct srpt_device
*sdev
)
571 struct ib_port_modify port_modify
= {
572 .clr_port_cap_mask
= IB_PORT_DEVICE_MGMT_SUP
,
574 struct srpt_port
*sport
;
577 for (i
= 1; i
<= sdev
->device
->phys_port_cnt
; i
++) {
578 sport
= &sdev
->port
[i
- 1];
579 WARN_ON(sport
->port
!= i
);
580 if (ib_modify_port(sdev
->device
, i
, 0, &port_modify
) < 0)
581 pr_err("disabling MAD processing failed.\n");
582 if (sport
->mad_agent
) {
583 ib_unregister_mad_agent(sport
->mad_agent
);
584 sport
->mad_agent
= NULL
;
590 * srpt_alloc_ioctx() - Allocate an SRPT I/O context structure.
592 static struct srpt_ioctx
*srpt_alloc_ioctx(struct srpt_device
*sdev
,
593 int ioctx_size
, int dma_size
,
594 enum dma_data_direction dir
)
596 struct srpt_ioctx
*ioctx
;
598 ioctx
= kmalloc(ioctx_size
, GFP_KERNEL
);
602 ioctx
->buf
= kmalloc(dma_size
, GFP_KERNEL
);
606 ioctx
->dma
= ib_dma_map_single(sdev
->device
, ioctx
->buf
, dma_size
, dir
);
607 if (ib_dma_mapping_error(sdev
->device
, ioctx
->dma
))
621 * srpt_free_ioctx() - Free an SRPT I/O context structure.
623 static void srpt_free_ioctx(struct srpt_device
*sdev
, struct srpt_ioctx
*ioctx
,
624 int dma_size
, enum dma_data_direction dir
)
629 ib_dma_unmap_single(sdev
->device
, ioctx
->dma
, dma_size
, dir
);
635 * srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures.
636 * @sdev: Device to allocate the I/O context ring for.
637 * @ring_size: Number of elements in the I/O context ring.
638 * @ioctx_size: I/O context size.
639 * @dma_size: DMA buffer size.
640 * @dir: DMA data direction.
642 static struct srpt_ioctx
**srpt_alloc_ioctx_ring(struct srpt_device
*sdev
,
643 int ring_size
, int ioctx_size
,
644 int dma_size
, enum dma_data_direction dir
)
646 struct srpt_ioctx
**ring
;
649 WARN_ON(ioctx_size
!= sizeof(struct srpt_recv_ioctx
)
650 && ioctx_size
!= sizeof(struct srpt_send_ioctx
));
652 ring
= kmalloc(ring_size
* sizeof(ring
[0]), GFP_KERNEL
);
655 for (i
= 0; i
< ring_size
; ++i
) {
656 ring
[i
] = srpt_alloc_ioctx(sdev
, ioctx_size
, dma_size
, dir
);
665 srpt_free_ioctx(sdev
, ring
[i
], dma_size
, dir
);
673 * srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures.
675 static void srpt_free_ioctx_ring(struct srpt_ioctx
**ioctx_ring
,
676 struct srpt_device
*sdev
, int ring_size
,
677 int dma_size
, enum dma_data_direction dir
)
681 for (i
= 0; i
< ring_size
; ++i
)
682 srpt_free_ioctx(sdev
, ioctx_ring
[i
], dma_size
, dir
);
687 * srpt_get_cmd_state() - Get the state of a SCSI command.
689 static enum srpt_command_state
srpt_get_cmd_state(struct srpt_send_ioctx
*ioctx
)
691 enum srpt_command_state state
;
696 spin_lock_irqsave(&ioctx
->spinlock
, flags
);
697 state
= ioctx
->state
;
698 spin_unlock_irqrestore(&ioctx
->spinlock
, flags
);
703 * srpt_set_cmd_state() - Set the state of a SCSI command.
705 * Does not modify the state of aborted commands. Returns the previous command
708 static enum srpt_command_state
srpt_set_cmd_state(struct srpt_send_ioctx
*ioctx
,
709 enum srpt_command_state
new)
711 enum srpt_command_state previous
;
716 spin_lock_irqsave(&ioctx
->spinlock
, flags
);
717 previous
= ioctx
->state
;
718 if (previous
!= SRPT_STATE_DONE
)
720 spin_unlock_irqrestore(&ioctx
->spinlock
, flags
);
726 * srpt_test_and_set_cmd_state() - Test and set the state of a command.
728 * Returns true if and only if the previous command state was equal to 'old'.
730 static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx
*ioctx
,
731 enum srpt_command_state old
,
732 enum srpt_command_state
new)
734 enum srpt_command_state previous
;
738 WARN_ON(old
== SRPT_STATE_DONE
);
739 WARN_ON(new == SRPT_STATE_NEW
);
741 spin_lock_irqsave(&ioctx
->spinlock
, flags
);
742 previous
= ioctx
->state
;
745 spin_unlock_irqrestore(&ioctx
->spinlock
, flags
);
746 return previous
== old
;
750 * srpt_post_recv() - Post an IB receive request.
752 static int srpt_post_recv(struct srpt_device
*sdev
,
753 struct srpt_recv_ioctx
*ioctx
)
756 struct ib_recv_wr wr
, *bad_wr
;
759 list
.addr
= ioctx
->ioctx
.dma
;
760 list
.length
= srp_max_req_size
;
761 list
.lkey
= sdev
->pd
->local_dma_lkey
;
763 ioctx
->ioctx
.cqe
.done
= srpt_recv_done
;
764 wr
.wr_cqe
= &ioctx
->ioctx
.cqe
;
769 return ib_post_srq_recv(sdev
->srq
, &wr
, &bad_wr
);
773 * srpt_zerolength_write() - Perform a zero-length RDMA write.
775 * A quote from the InfiniBand specification: C9-88: For an HCA responder
776 * using Reliable Connection service, for each zero-length RDMA READ or WRITE
777 * request, the R_Key shall not be validated, even if the request includes
780 static int srpt_zerolength_write(struct srpt_rdma_ch
*ch
)
782 struct ib_send_wr wr
, *bad_wr
;
784 memset(&wr
, 0, sizeof(wr
));
785 wr
.opcode
= IB_WR_RDMA_WRITE
;
786 wr
.wr_cqe
= &ch
->zw_cqe
;
787 wr
.send_flags
= IB_SEND_SIGNALED
;
788 return ib_post_send(ch
->qp
, &wr
, &bad_wr
);
791 static void srpt_zerolength_write_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
793 struct srpt_rdma_ch
*ch
= cq
->cq_context
;
795 if (wc
->status
== IB_WC_SUCCESS
) {
796 srpt_process_wait_list(ch
);
798 if (srpt_set_ch_state(ch
, CH_DISCONNECTED
))
799 schedule_work(&ch
->release_work
);
801 WARN_ONCE(1, "%s-%d\n", ch
->sess_name
, ch
->qp
->qp_num
);
805 static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx
*ioctx
,
806 struct srp_direct_buf
*db
, int nbufs
, struct scatterlist
**sg
,
809 enum dma_data_direction dir
= target_reverse_dma_direction(&ioctx
->cmd
);
810 struct srpt_rdma_ch
*ch
= ioctx
->ch
;
811 struct scatterlist
*prev
= NULL
;
816 ioctx
->rw_ctxs
= &ioctx
->s_rw_ctx
;
818 ioctx
->rw_ctxs
= kmalloc_array(nbufs
, sizeof(*ioctx
->rw_ctxs
),
824 for (i
= ioctx
->n_rw_ctx
; i
< nbufs
; i
++, db
++) {
825 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
826 u64 remote_addr
= be64_to_cpu(db
->va
);
827 u32 size
= be32_to_cpu(db
->len
);
828 u32 rkey
= be32_to_cpu(db
->key
);
830 ret
= target_alloc_sgl(&ctx
->sg
, &ctx
->nents
, size
, false,
835 ret
= rdma_rw_ctx_init(&ctx
->rw
, ch
->qp
, ch
->sport
->port
,
836 ctx
->sg
, ctx
->nents
, 0, remote_addr
, rkey
, dir
);
838 target_free_sgl(ctx
->sg
, ctx
->nents
);
842 ioctx
->n_rdma
+= ret
;
846 sg_unmark_end(&prev
[prev_nents
- 1]);
847 sg_chain(prev
, prev_nents
+ 1, ctx
->sg
);
853 prev_nents
= ctx
->nents
;
855 *sg_cnt
+= ctx
->nents
;
862 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
864 rdma_rw_ctx_destroy(&ctx
->rw
, ch
->qp
, ch
->sport
->port
,
865 ctx
->sg
, ctx
->nents
, dir
);
866 target_free_sgl(ctx
->sg
, ctx
->nents
);
868 if (ioctx
->rw_ctxs
!= &ioctx
->s_rw_ctx
)
869 kfree(ioctx
->rw_ctxs
);
873 static void srpt_free_rw_ctxs(struct srpt_rdma_ch
*ch
,
874 struct srpt_send_ioctx
*ioctx
)
876 enum dma_data_direction dir
= target_reverse_dma_direction(&ioctx
->cmd
);
879 for (i
= 0; i
< ioctx
->n_rw_ctx
; i
++) {
880 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
882 rdma_rw_ctx_destroy(&ctx
->rw
, ch
->qp
, ch
->sport
->port
,
883 ctx
->sg
, ctx
->nents
, dir
);
884 target_free_sgl(ctx
->sg
, ctx
->nents
);
887 if (ioctx
->rw_ctxs
!= &ioctx
->s_rw_ctx
)
888 kfree(ioctx
->rw_ctxs
);
891 static inline void *srpt_get_desc_buf(struct srp_cmd
*srp_cmd
)
894 * The pointer computations below will only be compiled correctly
895 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
896 * whether srp_cmd::add_data has been declared as a byte pointer.
898 BUILD_BUG_ON(!__same_type(srp_cmd
->add_data
[0], (s8
)0) &&
899 !__same_type(srp_cmd
->add_data
[0], (u8
)0));
902 * According to the SRP spec, the lower two bits of the 'ADDITIONAL
903 * CDB LENGTH' field are reserved and the size in bytes of this field
904 * is four times the value specified in bits 3..7. Hence the "& ~3".
906 return srp_cmd
->add_data
+ (srp_cmd
->add_cdb_len
& ~3);
910 * srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request.
911 * @ioctx: Pointer to the I/O context associated with the request.
912 * @srp_cmd: Pointer to the SRP_CMD request data.
913 * @dir: Pointer to the variable to which the transfer direction will be
915 * @data_len: Pointer to the variable to which the total data length of all
916 * descriptors in the SRP_CMD request will be written.
918 * This function initializes ioctx->nrbuf and ioctx->r_bufs.
920 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
921 * -ENOMEM when memory allocation fails and zero upon success.
923 static int srpt_get_desc_tbl(struct srpt_send_ioctx
*ioctx
,
924 struct srp_cmd
*srp_cmd
, enum dma_data_direction
*dir
,
925 struct scatterlist
**sg
, unsigned *sg_cnt
, u64
*data_len
)
931 * The lower four bits of the buffer format field contain the DATA-IN
932 * buffer descriptor format, and the highest four bits contain the
933 * DATA-OUT buffer descriptor format.
935 if (srp_cmd
->buf_fmt
& 0xf)
936 /* DATA-IN: transfer data from target to initiator (read). */
937 *dir
= DMA_FROM_DEVICE
;
938 else if (srp_cmd
->buf_fmt
>> 4)
939 /* DATA-OUT: transfer data from initiator to target (write). */
940 *dir
= DMA_TO_DEVICE
;
944 /* initialize data_direction early as srpt_alloc_rw_ctxs needs it */
945 ioctx
->cmd
.data_direction
= *dir
;
947 if (((srp_cmd
->buf_fmt
& 0xf) == SRP_DATA_DESC_DIRECT
) ||
948 ((srp_cmd
->buf_fmt
>> 4) == SRP_DATA_DESC_DIRECT
)) {
949 struct srp_direct_buf
*db
= srpt_get_desc_buf(srp_cmd
);
951 *data_len
= be32_to_cpu(db
->len
);
952 return srpt_alloc_rw_ctxs(ioctx
, db
, 1, sg
, sg_cnt
);
953 } else if (((srp_cmd
->buf_fmt
& 0xf) == SRP_DATA_DESC_INDIRECT
) ||
954 ((srp_cmd
->buf_fmt
>> 4) == SRP_DATA_DESC_INDIRECT
)) {
955 struct srp_indirect_buf
*idb
= srpt_get_desc_buf(srp_cmd
);
956 int nbufs
= be32_to_cpu(idb
->table_desc
.len
) /
957 sizeof(struct srp_direct_buf
);
960 (srp_cmd
->data_out_desc_cnt
+ srp_cmd
->data_in_desc_cnt
)) {
961 pr_err("received unsupported SRP_CMD request"
962 " type (%u out + %u in != %u / %zu)\n",
963 srp_cmd
->data_out_desc_cnt
,
964 srp_cmd
->data_in_desc_cnt
,
965 be32_to_cpu(idb
->table_desc
.len
),
966 sizeof(struct srp_direct_buf
));
970 *data_len
= be32_to_cpu(idb
->len
);
971 return srpt_alloc_rw_ctxs(ioctx
, idb
->desc_list
, nbufs
,
980 * srpt_init_ch_qp() - Initialize queue pair attributes.
982 * Initialized the attributes of queue pair 'qp' by allowing local write,
983 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
985 static int srpt_init_ch_qp(struct srpt_rdma_ch
*ch
, struct ib_qp
*qp
)
987 struct ib_qp_attr
*attr
;
990 attr
= kzalloc(sizeof(*attr
), GFP_KERNEL
);
994 attr
->qp_state
= IB_QPS_INIT
;
995 attr
->qp_access_flags
= IB_ACCESS_LOCAL_WRITE
| IB_ACCESS_REMOTE_READ
|
996 IB_ACCESS_REMOTE_WRITE
;
997 attr
->port_num
= ch
->sport
->port
;
998 attr
->pkey_index
= 0;
1000 ret
= ib_modify_qp(qp
, attr
,
1001 IB_QP_STATE
| IB_QP_ACCESS_FLAGS
| IB_QP_PORT
|
1009 * srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR).
1010 * @ch: channel of the queue pair.
1011 * @qp: queue pair to change the state of.
1013 * Returns zero upon success and a negative value upon failure.
1015 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1016 * If this structure ever becomes larger, it might be necessary to allocate
1017 * it dynamically instead of on the stack.
1019 static int srpt_ch_qp_rtr(struct srpt_rdma_ch
*ch
, struct ib_qp
*qp
)
1021 struct ib_qp_attr qp_attr
;
1025 qp_attr
.qp_state
= IB_QPS_RTR
;
1026 ret
= ib_cm_init_qp_attr(ch
->cm_id
, &qp_attr
, &attr_mask
);
1030 qp_attr
.max_dest_rd_atomic
= 4;
1032 ret
= ib_modify_qp(qp
, &qp_attr
, attr_mask
);
1039 * srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS).
1040 * @ch: channel of the queue pair.
1041 * @qp: queue pair to change the state of.
1043 * Returns zero upon success and a negative value upon failure.
1045 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1046 * If this structure ever becomes larger, it might be necessary to allocate
1047 * it dynamically instead of on the stack.
1049 static int srpt_ch_qp_rts(struct srpt_rdma_ch
*ch
, struct ib_qp
*qp
)
1051 struct ib_qp_attr qp_attr
;
1055 qp_attr
.qp_state
= IB_QPS_RTS
;
1056 ret
= ib_cm_init_qp_attr(ch
->cm_id
, &qp_attr
, &attr_mask
);
1060 qp_attr
.max_rd_atomic
= 4;
1062 ret
= ib_modify_qp(qp
, &qp_attr
, attr_mask
);
1069 * srpt_ch_qp_err() - Set the channel queue pair state to 'error'.
1071 static int srpt_ch_qp_err(struct srpt_rdma_ch
*ch
)
1073 struct ib_qp_attr qp_attr
;
1075 qp_attr
.qp_state
= IB_QPS_ERR
;
1076 return ib_modify_qp(ch
->qp
, &qp_attr
, IB_QP_STATE
);
1080 * srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator.
1082 static struct srpt_send_ioctx
*srpt_get_send_ioctx(struct srpt_rdma_ch
*ch
)
1084 struct srpt_send_ioctx
*ioctx
;
1085 unsigned long flags
;
1090 spin_lock_irqsave(&ch
->spinlock
, flags
);
1091 if (!list_empty(&ch
->free_list
)) {
1092 ioctx
= list_first_entry(&ch
->free_list
,
1093 struct srpt_send_ioctx
, free_list
);
1094 list_del(&ioctx
->free_list
);
1096 spin_unlock_irqrestore(&ch
->spinlock
, flags
);
1101 BUG_ON(ioctx
->ch
!= ch
);
1102 spin_lock_init(&ioctx
->spinlock
);
1103 ioctx
->state
= SRPT_STATE_NEW
;
1105 ioctx
->n_rw_ctx
= 0;
1106 init_completion(&ioctx
->tx_done
);
1107 ioctx
->queue_status_only
= false;
1109 * transport_init_se_cmd() does not initialize all fields, so do it
1112 memset(&ioctx
->cmd
, 0, sizeof(ioctx
->cmd
));
1113 memset(&ioctx
->sense_data
, 0, sizeof(ioctx
->sense_data
));
1119 * srpt_abort_cmd() - Abort a SCSI command.
1120 * @ioctx: I/O context associated with the SCSI command.
1121 * @context: Preferred execution context.
1123 static int srpt_abort_cmd(struct srpt_send_ioctx
*ioctx
)
1125 enum srpt_command_state state
;
1126 unsigned long flags
;
1131 * If the command is in a state where the target core is waiting for
1132 * the ib_srpt driver, change the state to the next state.
1135 spin_lock_irqsave(&ioctx
->spinlock
, flags
);
1136 state
= ioctx
->state
;
1138 case SRPT_STATE_NEED_DATA
:
1139 ioctx
->state
= SRPT_STATE_DATA_IN
;
1141 case SRPT_STATE_CMD_RSP_SENT
:
1142 case SRPT_STATE_MGMT_RSP_SENT
:
1143 ioctx
->state
= SRPT_STATE_DONE
;
1146 WARN_ONCE(true, "%s: unexpected I/O context state %d\n",
1150 spin_unlock_irqrestore(&ioctx
->spinlock
, flags
);
1152 pr_debug("Aborting cmd with state %d and tag %lld\n", state
,
1156 case SRPT_STATE_NEW
:
1157 case SRPT_STATE_DATA_IN
:
1158 case SRPT_STATE_MGMT
:
1159 case SRPT_STATE_DONE
:
1161 * Do nothing - defer abort processing until
1162 * srpt_queue_response() is invoked.
1165 case SRPT_STATE_NEED_DATA
:
1166 pr_debug("tag %#llx: RDMA read error\n", ioctx
->cmd
.tag
);
1167 transport_generic_request_failure(&ioctx
->cmd
,
1168 TCM_CHECK_CONDITION_ABORT_CMD
);
1170 case SRPT_STATE_CMD_RSP_SENT
:
1172 * SRP_RSP sending failed or the SRP_RSP send completion has
1173 * not been received in time.
1175 transport_generic_free_cmd(&ioctx
->cmd
, 0);
1177 case SRPT_STATE_MGMT_RSP_SENT
:
1178 transport_generic_free_cmd(&ioctx
->cmd
, 0);
1181 WARN(1, "Unexpected command state (%d)", state
);
1189 * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
1190 * the data that has been transferred via IB RDMA had to be postponed until the
1191 * check_stop_free() callback. None of this is necessary anymore and needs to
1194 static void srpt_rdma_read_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1196 struct srpt_rdma_ch
*ch
= cq
->cq_context
;
1197 struct srpt_send_ioctx
*ioctx
=
1198 container_of(wc
->wr_cqe
, struct srpt_send_ioctx
, rdma_cqe
);
1200 WARN_ON(ioctx
->n_rdma
<= 0);
1201 atomic_add(ioctx
->n_rdma
, &ch
->sq_wr_avail
);
1204 if (unlikely(wc
->status
!= IB_WC_SUCCESS
)) {
1205 pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",
1207 srpt_abort_cmd(ioctx
);
1211 if (srpt_test_and_set_cmd_state(ioctx
, SRPT_STATE_NEED_DATA
,
1212 SRPT_STATE_DATA_IN
))
1213 target_execute_cmd(&ioctx
->cmd
);
1215 pr_err("%s[%d]: wrong state = %d\n", __func__
,
1216 __LINE__
, srpt_get_cmd_state(ioctx
));
1220 * srpt_build_cmd_rsp() - Build an SRP_RSP response.
1221 * @ch: RDMA channel through which the request has been received.
1222 * @ioctx: I/O context associated with the SRP_CMD request. The response will
1223 * be built in the buffer ioctx->buf points at and hence this function will
1224 * overwrite the request data.
1225 * @tag: tag of the request for which this response is being generated.
1226 * @status: value for the STATUS field of the SRP_RSP information unit.
1228 * Returns the size in bytes of the SRP_RSP response.
1230 * An SRP_RSP response contains a SCSI status or service response. See also
1231 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1232 * response. See also SPC-2 for more information about sense data.
1234 static int srpt_build_cmd_rsp(struct srpt_rdma_ch
*ch
,
1235 struct srpt_send_ioctx
*ioctx
, u64 tag
,
1238 struct srp_rsp
*srp_rsp
;
1239 const u8
*sense_data
;
1240 int sense_data_len
, max_sense_len
;
1243 * The lowest bit of all SAM-3 status codes is zero (see also
1244 * paragraph 5.3 in SAM-3).
1246 WARN_ON(status
& 1);
1248 srp_rsp
= ioctx
->ioctx
.buf
;
1251 sense_data
= ioctx
->sense_data
;
1252 sense_data_len
= ioctx
->cmd
.scsi_sense_length
;
1253 WARN_ON(sense_data_len
> sizeof(ioctx
->sense_data
));
1255 memset(srp_rsp
, 0, sizeof(*srp_rsp
));
1256 srp_rsp
->opcode
= SRP_RSP
;
1257 srp_rsp
->req_lim_delta
=
1258 cpu_to_be32(1 + atomic_xchg(&ch
->req_lim_delta
, 0));
1260 srp_rsp
->status
= status
;
1262 if (sense_data_len
) {
1263 BUILD_BUG_ON(MIN_MAX_RSP_SIZE
<= sizeof(*srp_rsp
));
1264 max_sense_len
= ch
->max_ti_iu_len
- sizeof(*srp_rsp
);
1265 if (sense_data_len
> max_sense_len
) {
1266 pr_warn("truncated sense data from %d to %d"
1267 " bytes\n", sense_data_len
, max_sense_len
);
1268 sense_data_len
= max_sense_len
;
1271 srp_rsp
->flags
|= SRP_RSP_FLAG_SNSVALID
;
1272 srp_rsp
->sense_data_len
= cpu_to_be32(sense_data_len
);
1273 memcpy(srp_rsp
+ 1, sense_data
, sense_data_len
);
1276 return sizeof(*srp_rsp
) + sense_data_len
;
1280 * srpt_build_tskmgmt_rsp() - Build a task management response.
1281 * @ch: RDMA channel through which the request has been received.
1282 * @ioctx: I/O context in which the SRP_RSP response will be built.
1283 * @rsp_code: RSP_CODE that will be stored in the response.
1284 * @tag: Tag of the request for which this response is being generated.
1286 * Returns the size in bytes of the SRP_RSP response.
1288 * An SRP_RSP response contains a SCSI status or service response. See also
1289 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1292 static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch
*ch
,
1293 struct srpt_send_ioctx
*ioctx
,
1294 u8 rsp_code
, u64 tag
)
1296 struct srp_rsp
*srp_rsp
;
1301 resp_len
= sizeof(*srp_rsp
) + resp_data_len
;
1303 srp_rsp
= ioctx
->ioctx
.buf
;
1305 memset(srp_rsp
, 0, sizeof(*srp_rsp
));
1307 srp_rsp
->opcode
= SRP_RSP
;
1308 srp_rsp
->req_lim_delta
=
1309 cpu_to_be32(1 + atomic_xchg(&ch
->req_lim_delta
, 0));
1312 srp_rsp
->flags
|= SRP_RSP_FLAG_RSPVALID
;
1313 srp_rsp
->resp_data_len
= cpu_to_be32(resp_data_len
);
1314 srp_rsp
->data
[3] = rsp_code
;
1319 static int srpt_check_stop_free(struct se_cmd
*cmd
)
1321 struct srpt_send_ioctx
*ioctx
= container_of(cmd
,
1322 struct srpt_send_ioctx
, cmd
);
1324 return target_put_sess_cmd(&ioctx
->cmd
);
1328 * srpt_handle_cmd() - Process SRP_CMD.
1330 static void srpt_handle_cmd(struct srpt_rdma_ch
*ch
,
1331 struct srpt_recv_ioctx
*recv_ioctx
,
1332 struct srpt_send_ioctx
*send_ioctx
)
1335 struct srp_cmd
*srp_cmd
;
1336 struct scatterlist
*sg
= NULL
;
1337 unsigned sg_cnt
= 0;
1339 enum dma_data_direction dir
;
1342 BUG_ON(!send_ioctx
);
1344 srp_cmd
= recv_ioctx
->ioctx
.buf
;
1345 cmd
= &send_ioctx
->cmd
;
1346 cmd
->tag
= srp_cmd
->tag
;
1348 switch (srp_cmd
->task_attr
) {
1349 case SRP_CMD_SIMPLE_Q
:
1350 cmd
->sam_task_attr
= TCM_SIMPLE_TAG
;
1352 case SRP_CMD_ORDERED_Q
:
1354 cmd
->sam_task_attr
= TCM_ORDERED_TAG
;
1356 case SRP_CMD_HEAD_OF_Q
:
1357 cmd
->sam_task_attr
= TCM_HEAD_TAG
;
1360 cmd
->sam_task_attr
= TCM_ACA_TAG
;
1364 rc
= srpt_get_desc_tbl(send_ioctx
, srp_cmd
, &dir
, &sg
, &sg_cnt
,
1367 if (rc
!= -EAGAIN
) {
1368 pr_err("0x%llx: parsing SRP descriptor table failed.\n",
1374 rc
= target_submit_cmd_map_sgls(cmd
, ch
->sess
, srp_cmd
->cdb
,
1375 &send_ioctx
->sense_data
[0],
1376 scsilun_to_int(&srp_cmd
->lun
), data_len
,
1377 TCM_SIMPLE_TAG
, dir
, TARGET_SCF_ACK_KREF
,
1378 sg
, sg_cnt
, NULL
, 0, NULL
, 0);
1380 pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc
,
1387 send_ioctx
->state
= SRPT_STATE_DONE
;
1388 srpt_release_cmd(cmd
);
1391 static int srp_tmr_to_tcm(int fn
)
1394 case SRP_TSK_ABORT_TASK
:
1395 return TMR_ABORT_TASK
;
1396 case SRP_TSK_ABORT_TASK_SET
:
1397 return TMR_ABORT_TASK_SET
;
1398 case SRP_TSK_CLEAR_TASK_SET
:
1399 return TMR_CLEAR_TASK_SET
;
1400 case SRP_TSK_LUN_RESET
:
1401 return TMR_LUN_RESET
;
1402 case SRP_TSK_CLEAR_ACA
:
1403 return TMR_CLEAR_ACA
;
1410 * srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit.
1412 * Returns 0 if and only if the request will be processed by the target core.
1414 * For more information about SRP_TSK_MGMT information units, see also section
1415 * 6.7 in the SRP r16a document.
1417 static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch
*ch
,
1418 struct srpt_recv_ioctx
*recv_ioctx
,
1419 struct srpt_send_ioctx
*send_ioctx
)
1421 struct srp_tsk_mgmt
*srp_tsk
;
1423 struct se_session
*sess
= ch
->sess
;
1427 BUG_ON(!send_ioctx
);
1429 srp_tsk
= recv_ioctx
->ioctx
.buf
;
1430 cmd
= &send_ioctx
->cmd
;
1432 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld"
1433 " cm_id %p sess %p\n", srp_tsk
->tsk_mgmt_func
,
1434 srp_tsk
->task_tag
, srp_tsk
->tag
, ch
->cm_id
, ch
->sess
);
1436 srpt_set_cmd_state(send_ioctx
, SRPT_STATE_MGMT
);
1437 send_ioctx
->cmd
.tag
= srp_tsk
->tag
;
1438 tcm_tmr
= srp_tmr_to_tcm(srp_tsk
->tsk_mgmt_func
);
1439 rc
= target_submit_tmr(&send_ioctx
->cmd
, sess
, NULL
,
1440 scsilun_to_int(&srp_tsk
->lun
), srp_tsk
, tcm_tmr
,
1441 GFP_KERNEL
, srp_tsk
->task_tag
,
1442 TARGET_SCF_ACK_KREF
);
1444 send_ioctx
->cmd
.se_tmr_req
->response
= TMR_FUNCTION_REJECTED
;
1449 transport_send_check_condition_and_sense(cmd
, 0, 0); // XXX:
1453 * srpt_handle_new_iu() - Process a newly received information unit.
1454 * @ch: RDMA channel through which the information unit has been received.
1455 * @ioctx: SRPT I/O context associated with the information unit.
1457 static void srpt_handle_new_iu(struct srpt_rdma_ch
*ch
,
1458 struct srpt_recv_ioctx
*recv_ioctx
,
1459 struct srpt_send_ioctx
*send_ioctx
)
1461 struct srp_cmd
*srp_cmd
;
1464 BUG_ON(!recv_ioctx
);
1466 ib_dma_sync_single_for_cpu(ch
->sport
->sdev
->device
,
1467 recv_ioctx
->ioctx
.dma
, srp_max_req_size
,
1470 if (unlikely(ch
->state
== CH_CONNECTING
))
1473 if (unlikely(ch
->state
!= CH_LIVE
))
1476 srp_cmd
= recv_ioctx
->ioctx
.buf
;
1477 if (srp_cmd
->opcode
== SRP_CMD
|| srp_cmd
->opcode
== SRP_TSK_MGMT
) {
1479 if (!list_empty(&ch
->cmd_wait_list
))
1481 send_ioctx
= srpt_get_send_ioctx(ch
);
1483 if (unlikely(!send_ioctx
))
1487 switch (srp_cmd
->opcode
) {
1489 srpt_handle_cmd(ch
, recv_ioctx
, send_ioctx
);
1492 srpt_handle_tsk_mgmt(ch
, recv_ioctx
, send_ioctx
);
1495 pr_err("Not yet implemented: SRP_I_LOGOUT\n");
1498 pr_debug("received SRP_CRED_RSP\n");
1501 pr_debug("received SRP_AER_RSP\n");
1504 pr_err("Received SRP_RSP\n");
1507 pr_err("received IU with unknown opcode 0x%x\n",
1512 srpt_post_recv(ch
->sport
->sdev
, recv_ioctx
);
1516 list_add_tail(&recv_ioctx
->wait_list
, &ch
->cmd_wait_list
);
1519 static void srpt_recv_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1521 struct srpt_rdma_ch
*ch
= cq
->cq_context
;
1522 struct srpt_recv_ioctx
*ioctx
=
1523 container_of(wc
->wr_cqe
, struct srpt_recv_ioctx
, ioctx
.cqe
);
1525 if (wc
->status
== IB_WC_SUCCESS
) {
1528 req_lim
= atomic_dec_return(&ch
->req_lim
);
1529 if (unlikely(req_lim
< 0))
1530 pr_err("req_lim = %d < 0\n", req_lim
);
1531 srpt_handle_new_iu(ch
, ioctx
, NULL
);
1533 pr_info("receiving failed for ioctx %p with status %d\n",
1539 * This function must be called from the context in which RDMA completions are
1540 * processed because it accesses the wait list without protection against
1541 * access from other threads.
1543 static void srpt_process_wait_list(struct srpt_rdma_ch
*ch
)
1545 struct srpt_send_ioctx
*ioctx
;
1547 while (!list_empty(&ch
->cmd_wait_list
) &&
1548 ch
->state
>= CH_LIVE
&&
1549 (ioctx
= srpt_get_send_ioctx(ch
)) != NULL
) {
1550 struct srpt_recv_ioctx
*recv_ioctx
;
1552 recv_ioctx
= list_first_entry(&ch
->cmd_wait_list
,
1553 struct srpt_recv_ioctx
,
1555 list_del(&recv_ioctx
->wait_list
);
1556 srpt_handle_new_iu(ch
, recv_ioctx
, ioctx
);
1561 * Note: Although this has not yet been observed during tests, at least in
1562 * theory it is possible that the srpt_get_send_ioctx() call invoked by
1563 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
1564 * value in each response is set to one, and it is possible that this response
1565 * makes the initiator send a new request before the send completion for that
1566 * response has been processed. This could e.g. happen if the call to
1567 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
1568 * if IB retransmission causes generation of the send completion to be
1569 * delayed. Incoming information units for which srpt_get_send_ioctx() fails
1570 * are queued on cmd_wait_list. The code below processes these delayed
1571 * requests one at a time.
1573 static void srpt_send_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1575 struct srpt_rdma_ch
*ch
= cq
->cq_context
;
1576 struct srpt_send_ioctx
*ioctx
=
1577 container_of(wc
->wr_cqe
, struct srpt_send_ioctx
, ioctx
.cqe
);
1578 enum srpt_command_state state
;
1580 state
= srpt_set_cmd_state(ioctx
, SRPT_STATE_DONE
);
1582 WARN_ON(state
!= SRPT_STATE_CMD_RSP_SENT
&&
1583 state
!= SRPT_STATE_MGMT_RSP_SENT
);
1585 atomic_add(1 + ioctx
->n_rdma
, &ch
->sq_wr_avail
);
1587 if (wc
->status
!= IB_WC_SUCCESS
)
1588 pr_info("sending response for ioctx 0x%p failed"
1589 " with status %d\n", ioctx
, wc
->status
);
1591 if (state
!= SRPT_STATE_DONE
) {
1592 transport_generic_free_cmd(&ioctx
->cmd
, 0);
1594 pr_err("IB completion has been received too late for"
1595 " wr_id = %u.\n", ioctx
->ioctx
.index
);
1598 srpt_process_wait_list(ch
);
1602 * srpt_create_ch_ib() - Create receive and send completion queues.
1604 static int srpt_create_ch_ib(struct srpt_rdma_ch
*ch
)
1606 struct ib_qp_init_attr
*qp_init
;
1607 struct srpt_port
*sport
= ch
->sport
;
1608 struct srpt_device
*sdev
= sport
->sdev
;
1609 const struct ib_device_attr
*attrs
= &sdev
->device
->attrs
;
1610 u32 srp_sq_size
= sport
->port_attrib
.srp_sq_size
;
1613 WARN_ON(ch
->rq_size
< 1);
1616 qp_init
= kzalloc(sizeof(*qp_init
), GFP_KERNEL
);
1621 ch
->cq
= ib_alloc_cq(sdev
->device
, ch
, ch
->rq_size
+ srp_sq_size
,
1622 0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE
);
1623 if (IS_ERR(ch
->cq
)) {
1624 ret
= PTR_ERR(ch
->cq
);
1625 pr_err("failed to create CQ cqe= %d ret= %d\n",
1626 ch
->rq_size
+ srp_sq_size
, ret
);
1630 qp_init
->qp_context
= (void *)ch
;
1631 qp_init
->event_handler
1632 = (void(*)(struct ib_event
*, void*))srpt_qp_event
;
1633 qp_init
->send_cq
= ch
->cq
;
1634 qp_init
->recv_cq
= ch
->cq
;
1635 qp_init
->srq
= sdev
->srq
;
1636 qp_init
->sq_sig_type
= IB_SIGNAL_REQ_WR
;
1637 qp_init
->qp_type
= IB_QPT_RC
;
1639 * We divide up our send queue size into half SEND WRs to send the
1640 * completions, and half R/W contexts to actually do the RDMA
1641 * READ/WRITE transfers. Note that we need to allocate CQ slots for
1642 * both both, as RDMA contexts will also post completions for the
1645 qp_init
->cap
.max_send_wr
= srp_sq_size
/ 2;
1646 qp_init
->cap
.max_rdma_ctxs
= srp_sq_size
/ 2;
1647 qp_init
->cap
.max_send_sge
= min(attrs
->max_sge
, SRPT_MAX_SG_PER_WQE
);
1648 qp_init
->port_num
= ch
->sport
->port
;
1650 ch
->qp
= ib_create_qp(sdev
->pd
, qp_init
);
1651 if (IS_ERR(ch
->qp
)) {
1652 ret
= PTR_ERR(ch
->qp
);
1653 if (ret
== -ENOMEM
) {
1655 if (srp_sq_size
>= MIN_SRPT_SQ_SIZE
) {
1656 ib_destroy_cq(ch
->cq
);
1660 pr_err("failed to create_qp ret= %d\n", ret
);
1661 goto err_destroy_cq
;
1664 atomic_set(&ch
->sq_wr_avail
, qp_init
->cap
.max_send_wr
);
1666 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
1667 __func__
, ch
->cq
->cqe
, qp_init
->cap
.max_send_sge
,
1668 qp_init
->cap
.max_send_wr
, ch
->cm_id
);
1670 ret
= srpt_init_ch_qp(ch
, ch
->qp
);
1672 goto err_destroy_qp
;
1679 ib_destroy_qp(ch
->qp
);
1685 static void srpt_destroy_ch_ib(struct srpt_rdma_ch
*ch
)
1687 ib_destroy_qp(ch
->qp
);
1692 * srpt_close_ch() - Close an RDMA channel.
1694 * Make sure all resources associated with the channel will be deallocated at
1695 * an appropriate time.
1697 * Returns true if and only if the channel state has been modified into
1700 static bool srpt_close_ch(struct srpt_rdma_ch
*ch
)
1704 if (!srpt_set_ch_state(ch
, CH_DRAINING
)) {
1705 pr_debug("%s-%d: already closed\n", ch
->sess_name
,
1710 kref_get(&ch
->kref
);
1712 ret
= srpt_ch_qp_err(ch
);
1714 pr_err("%s-%d: changing queue pair into error state failed: %d\n",
1715 ch
->sess_name
, ch
->qp
->qp_num
, ret
);
1717 pr_debug("%s-%d: queued zerolength write\n", ch
->sess_name
,
1719 ret
= srpt_zerolength_write(ch
);
1721 pr_err("%s-%d: queuing zero-length write failed: %d\n",
1722 ch
->sess_name
, ch
->qp
->qp_num
, ret
);
1723 if (srpt_set_ch_state(ch
, CH_DISCONNECTED
))
1724 schedule_work(&ch
->release_work
);
1729 kref_put(&ch
->kref
, srpt_free_ch
);
1735 * Change the channel state into CH_DISCONNECTING. If a channel has not yet
1736 * reached the connected state, close it. If a channel is in the connected
1737 * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is
1738 * the responsibility of the caller to ensure that this function is not
1739 * invoked concurrently with the code that accepts a connection. This means
1740 * that this function must either be invoked from inside a CM callback
1741 * function or that it must be invoked with the srpt_port.mutex held.
1743 static int srpt_disconnect_ch(struct srpt_rdma_ch
*ch
)
1747 if (!srpt_set_ch_state(ch
, CH_DISCONNECTING
))
1750 ret
= ib_send_cm_dreq(ch
->cm_id
, NULL
, 0);
1752 ret
= ib_send_cm_drep(ch
->cm_id
, NULL
, 0);
1754 if (ret
< 0 && srpt_close_ch(ch
))
1760 static void __srpt_close_all_ch(struct srpt_device
*sdev
)
1762 struct srpt_rdma_ch
*ch
;
1764 lockdep_assert_held(&sdev
->mutex
);
1766 list_for_each_entry(ch
, &sdev
->rch_list
, list
) {
1767 if (srpt_disconnect_ch(ch
) >= 0)
1768 pr_info("Closing channel %s-%d because target %s has been disabled\n",
1769 ch
->sess_name
, ch
->qp
->qp_num
,
1770 sdev
->device
->name
);
1775 static void srpt_free_ch(struct kref
*kref
)
1777 struct srpt_rdma_ch
*ch
= container_of(kref
, struct srpt_rdma_ch
, kref
);
1782 static void srpt_release_channel_work(struct work_struct
*w
)
1784 struct srpt_rdma_ch
*ch
;
1785 struct srpt_device
*sdev
;
1786 struct se_session
*se_sess
;
1788 ch
= container_of(w
, struct srpt_rdma_ch
, release_work
);
1789 pr_debug("%s: %s-%d; release_done = %p\n", __func__
, ch
->sess_name
,
1790 ch
->qp
->qp_num
, ch
->release_done
);
1792 sdev
= ch
->sport
->sdev
;
1798 target_sess_cmd_list_set_waiting(se_sess
);
1799 target_wait_for_sess_cmds(se_sess
);
1801 transport_deregister_session_configfs(se_sess
);
1802 transport_deregister_session(se_sess
);
1805 ib_destroy_cm_id(ch
->cm_id
);
1807 srpt_destroy_ch_ib(ch
);
1809 srpt_free_ioctx_ring((struct srpt_ioctx
**)ch
->ioctx_ring
,
1810 ch
->sport
->sdev
, ch
->rq_size
,
1811 ch
->rsp_size
, DMA_TO_DEVICE
);
1813 mutex_lock(&sdev
->mutex
);
1814 list_del_init(&ch
->list
);
1815 if (ch
->release_done
)
1816 complete(ch
->release_done
);
1817 mutex_unlock(&sdev
->mutex
);
1819 wake_up(&sdev
->ch_releaseQ
);
1821 kref_put(&ch
->kref
, srpt_free_ch
);
1825 * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED.
1827 * Ownership of the cm_id is transferred to the target session if this
1828 * functions returns zero. Otherwise the caller remains the owner of cm_id.
1830 static int srpt_cm_req_recv(struct ib_cm_id
*cm_id
,
1831 struct ib_cm_req_event_param
*param
,
1834 struct srpt_device
*sdev
= cm_id
->context
;
1835 struct srpt_port
*sport
= &sdev
->port
[param
->port
- 1];
1836 struct srp_login_req
*req
;
1837 struct srp_login_rsp
*rsp
;
1838 struct srp_login_rej
*rej
;
1839 struct ib_cm_rep_param
*rep_param
;
1840 struct srpt_rdma_ch
*ch
, *tmp_ch
;
1845 WARN_ON_ONCE(irqs_disabled());
1847 if (WARN_ON(!sdev
|| !private_data
))
1850 req
= (struct srp_login_req
*)private_data
;
1852 it_iu_len
= be32_to_cpu(req
->req_it_iu_len
);
1854 pr_info("Received SRP_LOGIN_REQ with i_port_id 0x%llx:0x%llx,"
1855 " t_port_id 0x%llx:0x%llx and it_iu_len %d on port %d"
1856 " (guid=0x%llx:0x%llx)\n",
1857 be64_to_cpu(*(__be64
*)&req
->initiator_port_id
[0]),
1858 be64_to_cpu(*(__be64
*)&req
->initiator_port_id
[8]),
1859 be64_to_cpu(*(__be64
*)&req
->target_port_id
[0]),
1860 be64_to_cpu(*(__be64
*)&req
->target_port_id
[8]),
1863 be64_to_cpu(*(__be64
*)&sdev
->port
[param
->port
- 1].gid
.raw
[0]),
1864 be64_to_cpu(*(__be64
*)&sdev
->port
[param
->port
- 1].gid
.raw
[8]));
1866 rsp
= kzalloc(sizeof(*rsp
), GFP_KERNEL
);
1867 rej
= kzalloc(sizeof(*rej
), GFP_KERNEL
);
1868 rep_param
= kzalloc(sizeof(*rep_param
), GFP_KERNEL
);
1870 if (!rsp
|| !rej
|| !rep_param
) {
1875 if (it_iu_len
> srp_max_req_size
|| it_iu_len
< 64) {
1876 rej
->reason
= cpu_to_be32(
1877 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE
);
1879 pr_err("rejected SRP_LOGIN_REQ because its"
1880 " length (%d bytes) is out of range (%d .. %d)\n",
1881 it_iu_len
, 64, srp_max_req_size
);
1885 if (!sport
->enabled
) {
1886 rej
->reason
= cpu_to_be32(
1887 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
1889 pr_err("rejected SRP_LOGIN_REQ because the target port"
1890 " has not yet been enabled\n");
1894 if ((req
->req_flags
& SRP_MTCH_ACTION
) == SRP_MULTICHAN_SINGLE
) {
1895 rsp
->rsp_flags
= SRP_LOGIN_RSP_MULTICHAN_NO_CHAN
;
1897 mutex_lock(&sdev
->mutex
);
1899 list_for_each_entry_safe(ch
, tmp_ch
, &sdev
->rch_list
, list
) {
1900 if (!memcmp(ch
->i_port_id
, req
->initiator_port_id
, 16)
1901 && !memcmp(ch
->t_port_id
, req
->target_port_id
, 16)
1902 && param
->port
== ch
->sport
->port
1903 && param
->listen_id
== ch
->sport
->sdev
->cm_id
1905 if (srpt_disconnect_ch(ch
) < 0)
1907 pr_info("Relogin - closed existing channel %s\n",
1910 SRP_LOGIN_RSP_MULTICHAN_TERMINATED
;
1914 mutex_unlock(&sdev
->mutex
);
1917 rsp
->rsp_flags
= SRP_LOGIN_RSP_MULTICHAN_MAINTAINED
;
1919 if (*(__be64
*)req
->target_port_id
!= cpu_to_be64(srpt_service_guid
)
1920 || *(__be64
*)(req
->target_port_id
+ 8) !=
1921 cpu_to_be64(srpt_service_guid
)) {
1922 rej
->reason
= cpu_to_be32(
1923 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL
);
1925 pr_err("rejected SRP_LOGIN_REQ because it"
1926 " has an invalid target port identifier.\n");
1930 ch
= kzalloc(sizeof(*ch
), GFP_KERNEL
);
1932 rej
->reason
= cpu_to_be32(
1933 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
1934 pr_err("rejected SRP_LOGIN_REQ because no memory.\n");
1939 kref_init(&ch
->kref
);
1940 ch
->zw_cqe
.done
= srpt_zerolength_write_done
;
1941 INIT_WORK(&ch
->release_work
, srpt_release_channel_work
);
1942 memcpy(ch
->i_port_id
, req
->initiator_port_id
, 16);
1943 memcpy(ch
->t_port_id
, req
->target_port_id
, 16);
1944 ch
->sport
= &sdev
->port
[param
->port
- 1];
1946 cm_id
->context
= ch
;
1948 * Avoid QUEUE_FULL conditions by limiting the number of buffers used
1949 * for the SRP protocol to the command queue size.
1951 ch
->rq_size
= SRPT_RQ_SIZE
;
1952 spin_lock_init(&ch
->spinlock
);
1953 ch
->state
= CH_CONNECTING
;
1954 INIT_LIST_HEAD(&ch
->cmd_wait_list
);
1955 ch
->rsp_size
= ch
->sport
->port_attrib
.srp_max_rsp_size
;
1957 ch
->ioctx_ring
= (struct srpt_send_ioctx
**)
1958 srpt_alloc_ioctx_ring(ch
->sport
->sdev
, ch
->rq_size
,
1959 sizeof(*ch
->ioctx_ring
[0]),
1960 ch
->rsp_size
, DMA_TO_DEVICE
);
1961 if (!ch
->ioctx_ring
)
1964 INIT_LIST_HEAD(&ch
->free_list
);
1965 for (i
= 0; i
< ch
->rq_size
; i
++) {
1966 ch
->ioctx_ring
[i
]->ch
= ch
;
1967 list_add_tail(&ch
->ioctx_ring
[i
]->free_list
, &ch
->free_list
);
1970 ret
= srpt_create_ch_ib(ch
);
1972 rej
->reason
= cpu_to_be32(
1973 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
1974 pr_err("rejected SRP_LOGIN_REQ because creating"
1975 " a new RDMA channel failed.\n");
1979 ret
= srpt_ch_qp_rtr(ch
, ch
->qp
);
1981 rej
->reason
= cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
1982 pr_err("rejected SRP_LOGIN_REQ because enabling"
1983 " RTR failed (error code = %d)\n", ret
);
1988 * Use the initator port identifier as the session name, when
1989 * checking against se_node_acl->initiatorname[] this can be
1990 * with or without preceeding '0x'.
1992 snprintf(ch
->sess_name
, sizeof(ch
->sess_name
), "0x%016llx%016llx",
1993 be64_to_cpu(*(__be64
*)ch
->i_port_id
),
1994 be64_to_cpu(*(__be64
*)(ch
->i_port_id
+ 8)));
1996 pr_debug("registering session %s\n", ch
->sess_name
);
1997 p
= &ch
->sess_name
[0];
2000 ch
->sess
= target_alloc_session(&sport
->port_tpg_1
, 0, 0,
2001 TARGET_PROT_NORMAL
, p
, ch
, NULL
);
2002 if (IS_ERR(ch
->sess
)) {
2003 pr_info("Rejected login because no ACL has been"
2004 " configured yet for initiator %s.\n", p
);
2006 * XXX: Hack to retry of ch->i_port_id without leading '0x'
2008 if (p
== &ch
->sess_name
[0]) {
2012 rej
->reason
= cpu_to_be32((PTR_ERR(ch
->sess
) == -ENOMEM
) ?
2013 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
:
2014 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED
);
2018 pr_debug("Establish connection sess=%p name=%s cm_id=%p\n", ch
->sess
,
2019 ch
->sess_name
, ch
->cm_id
);
2021 /* create srp_login_response */
2022 rsp
->opcode
= SRP_LOGIN_RSP
;
2023 rsp
->tag
= req
->tag
;
2024 rsp
->max_it_iu_len
= req
->req_it_iu_len
;
2025 rsp
->max_ti_iu_len
= req
->req_it_iu_len
;
2026 ch
->max_ti_iu_len
= it_iu_len
;
2027 rsp
->buf_fmt
= cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2028 | SRP_BUF_FORMAT_INDIRECT
);
2029 rsp
->req_lim_delta
= cpu_to_be32(ch
->rq_size
);
2030 atomic_set(&ch
->req_lim
, ch
->rq_size
);
2031 atomic_set(&ch
->req_lim_delta
, 0);
2033 /* create cm reply */
2034 rep_param
->qp_num
= ch
->qp
->qp_num
;
2035 rep_param
->private_data
= (void *)rsp
;
2036 rep_param
->private_data_len
= sizeof(*rsp
);
2037 rep_param
->rnr_retry_count
= 7;
2038 rep_param
->flow_control
= 1;
2039 rep_param
->failover_accepted
= 0;
2041 rep_param
->responder_resources
= 4;
2042 rep_param
->initiator_depth
= 4;
2044 ret
= ib_send_cm_rep(cm_id
, rep_param
);
2046 pr_err("sending SRP_LOGIN_REQ response failed"
2047 " (error code = %d)\n", ret
);
2048 goto release_channel
;
2051 mutex_lock(&sdev
->mutex
);
2052 list_add_tail(&ch
->list
, &sdev
->rch_list
);
2053 mutex_unlock(&sdev
->mutex
);
2058 srpt_disconnect_ch(ch
);
2059 transport_deregister_session_configfs(ch
->sess
);
2060 transport_deregister_session(ch
->sess
);
2064 srpt_destroy_ch_ib(ch
);
2067 srpt_free_ioctx_ring((struct srpt_ioctx
**)ch
->ioctx_ring
,
2068 ch
->sport
->sdev
, ch
->rq_size
,
2069 ch
->rsp_size
, DMA_TO_DEVICE
);
2074 rej
->opcode
= SRP_LOGIN_REJ
;
2075 rej
->tag
= req
->tag
;
2076 rej
->buf_fmt
= cpu_to_be16(SRP_BUF_FORMAT_DIRECT
2077 | SRP_BUF_FORMAT_INDIRECT
);
2079 ib_send_cm_rej(cm_id
, IB_CM_REJ_CONSUMER_DEFINED
, NULL
, 0,
2080 (void *)rej
, sizeof(*rej
));
2090 static void srpt_cm_rej_recv(struct srpt_rdma_ch
*ch
,
2091 enum ib_cm_rej_reason reason
,
2092 const u8
*private_data
,
2093 u8 private_data_len
)
2098 if (private_data_len
&& (priv
= kmalloc(private_data_len
* 3 + 1,
2100 for (i
= 0; i
< private_data_len
; i
++)
2101 sprintf(priv
+ 3 * i
, " %02x", private_data
[i
]);
2103 pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n",
2104 ch
->sess_name
, ch
->qp
->qp_num
, reason
, private_data_len
?
2105 "; private data" : "", priv
? priv
: " (?)");
2110 * srpt_cm_rtu_recv() - Process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event.
2112 * An IB_CM_RTU_RECEIVED message indicates that the connection is established
2113 * and that the recipient may begin transmitting (RTU = ready to use).
2115 static void srpt_cm_rtu_recv(struct srpt_rdma_ch
*ch
)
2119 if (srpt_set_ch_state(ch
, CH_LIVE
)) {
2120 ret
= srpt_ch_qp_rts(ch
, ch
->qp
);
2123 /* Trigger wait list processing. */
2124 ret
= srpt_zerolength_write(ch
);
2125 WARN_ONCE(ret
< 0, "%d\n", ret
);
2133 * srpt_cm_handler() - IB connection manager callback function.
2135 * A non-zero return value will cause the caller destroy the CM ID.
2137 * Note: srpt_cm_handler() must only return a non-zero value when transferring
2138 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
2139 * a non-zero value in any other case will trigger a race with the
2140 * ib_destroy_cm_id() call in srpt_release_channel().
2142 static int srpt_cm_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
)
2144 struct srpt_rdma_ch
*ch
= cm_id
->context
;
2148 switch (event
->event
) {
2149 case IB_CM_REQ_RECEIVED
:
2150 ret
= srpt_cm_req_recv(cm_id
, &event
->param
.req_rcvd
,
2151 event
->private_data
);
2153 case IB_CM_REJ_RECEIVED
:
2154 srpt_cm_rej_recv(ch
, event
->param
.rej_rcvd
.reason
,
2155 event
->private_data
,
2156 IB_CM_REJ_PRIVATE_DATA_SIZE
);
2158 case IB_CM_RTU_RECEIVED
:
2159 case IB_CM_USER_ESTABLISHED
:
2160 srpt_cm_rtu_recv(ch
);
2162 case IB_CM_DREQ_RECEIVED
:
2163 srpt_disconnect_ch(ch
);
2165 case IB_CM_DREP_RECEIVED
:
2166 pr_info("Received CM DREP message for ch %s-%d.\n",
2167 ch
->sess_name
, ch
->qp
->qp_num
);
2170 case IB_CM_TIMEWAIT_EXIT
:
2171 pr_info("Received CM TimeWait exit for ch %s-%d.\n",
2172 ch
->sess_name
, ch
->qp
->qp_num
);
2175 case IB_CM_REP_ERROR
:
2176 pr_info("Received CM REP error for ch %s-%d.\n", ch
->sess_name
,
2179 case IB_CM_DREQ_ERROR
:
2180 pr_info("Received CM DREQ ERROR event.\n");
2182 case IB_CM_MRA_RECEIVED
:
2183 pr_info("Received CM MRA event\n");
2186 pr_err("received unrecognized CM event %d\n", event
->event
);
2193 static int srpt_write_pending_status(struct se_cmd
*se_cmd
)
2195 struct srpt_send_ioctx
*ioctx
;
2197 ioctx
= container_of(se_cmd
, struct srpt_send_ioctx
, cmd
);
2198 return srpt_get_cmd_state(ioctx
) == SRPT_STATE_NEED_DATA
;
2202 * srpt_write_pending() - Start data transfer from initiator to target (write).
2204 static int srpt_write_pending(struct se_cmd
*se_cmd
)
2206 struct srpt_send_ioctx
*ioctx
=
2207 container_of(se_cmd
, struct srpt_send_ioctx
, cmd
);
2208 struct srpt_rdma_ch
*ch
= ioctx
->ch
;
2209 struct ib_send_wr
*first_wr
= NULL
, *bad_wr
;
2210 struct ib_cqe
*cqe
= &ioctx
->rdma_cqe
;
2211 enum srpt_command_state new_state
;
2214 new_state
= srpt_set_cmd_state(ioctx
, SRPT_STATE_NEED_DATA
);
2215 WARN_ON(new_state
== SRPT_STATE_DONE
);
2217 if (atomic_sub_return(ioctx
->n_rdma
, &ch
->sq_wr_avail
) < 0) {
2218 pr_warn("%s: IB send queue full (needed %d)\n",
2219 __func__
, ioctx
->n_rdma
);
2224 cqe
->done
= srpt_rdma_read_done
;
2225 for (i
= ioctx
->n_rw_ctx
- 1; i
>= 0; i
--) {
2226 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
2228 first_wr
= rdma_rw_ctx_wrs(&ctx
->rw
, ch
->qp
, ch
->sport
->port
,
2233 ret
= ib_post_send(ch
->qp
, first_wr
, &bad_wr
);
2235 pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n",
2236 __func__
, ret
, ioctx
->n_rdma
,
2237 atomic_read(&ch
->sq_wr_avail
));
2243 atomic_add(ioctx
->n_rdma
, &ch
->sq_wr_avail
);
2247 static u8
tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status
)
2249 switch (tcm_mgmt_status
) {
2250 case TMR_FUNCTION_COMPLETE
:
2251 return SRP_TSK_MGMT_SUCCESS
;
2252 case TMR_FUNCTION_REJECTED
:
2253 return SRP_TSK_MGMT_FUNC_NOT_SUPP
;
2255 return SRP_TSK_MGMT_FAILED
;
2259 * srpt_queue_response() - Transmits the response to a SCSI command.
2261 * Callback function called by the TCM core. Must not block since it can be
2262 * invoked on the context of the IB completion handler.
2264 static void srpt_queue_response(struct se_cmd
*cmd
)
2266 struct srpt_send_ioctx
*ioctx
=
2267 container_of(cmd
, struct srpt_send_ioctx
, cmd
);
2268 struct srpt_rdma_ch
*ch
= ioctx
->ch
;
2269 struct srpt_device
*sdev
= ch
->sport
->sdev
;
2270 struct ib_send_wr send_wr
, *first_wr
= &send_wr
, *bad_wr
;
2272 enum srpt_command_state state
;
2273 unsigned long flags
;
2274 int resp_len
, ret
, i
;
2279 spin_lock_irqsave(&ioctx
->spinlock
, flags
);
2280 state
= ioctx
->state
;
2282 case SRPT_STATE_NEW
:
2283 case SRPT_STATE_DATA_IN
:
2284 ioctx
->state
= SRPT_STATE_CMD_RSP_SENT
;
2286 case SRPT_STATE_MGMT
:
2287 ioctx
->state
= SRPT_STATE_MGMT_RSP_SENT
;
2290 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
2291 ch
, ioctx
->ioctx
.index
, ioctx
->state
);
2294 spin_unlock_irqrestore(&ioctx
->spinlock
, flags
);
2296 if (unlikely(transport_check_aborted_status(&ioctx
->cmd
, false)
2297 || WARN_ON_ONCE(state
== SRPT_STATE_CMD_RSP_SENT
))) {
2298 atomic_inc(&ch
->req_lim_delta
);
2299 srpt_abort_cmd(ioctx
);
2303 /* For read commands, transfer the data to the initiator. */
2304 if (ioctx
->cmd
.data_direction
== DMA_FROM_DEVICE
&&
2305 ioctx
->cmd
.data_length
&&
2306 !ioctx
->queue_status_only
) {
2307 for (i
= ioctx
->n_rw_ctx
- 1; i
>= 0; i
--) {
2308 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
2310 first_wr
= rdma_rw_ctx_wrs(&ctx
->rw
, ch
->qp
,
2311 ch
->sport
->port
, NULL
, first_wr
);
2315 if (state
!= SRPT_STATE_MGMT
)
2316 resp_len
= srpt_build_cmd_rsp(ch
, ioctx
, ioctx
->cmd
.tag
,
2320 = tcm_to_srp_tsk_mgmt_status(cmd
->se_tmr_req
->response
);
2321 resp_len
= srpt_build_tskmgmt_rsp(ch
, ioctx
, srp_tm_status
,
2325 atomic_inc(&ch
->req_lim
);
2327 if (unlikely(atomic_sub_return(1 + ioctx
->n_rdma
,
2328 &ch
->sq_wr_avail
) < 0)) {
2329 pr_warn("%s: IB send queue full (needed %d)\n",
2330 __func__
, ioctx
->n_rdma
);
2335 ib_dma_sync_single_for_device(sdev
->device
, ioctx
->ioctx
.dma
, resp_len
,
2338 sge
.addr
= ioctx
->ioctx
.dma
;
2339 sge
.length
= resp_len
;
2340 sge
.lkey
= sdev
->pd
->local_dma_lkey
;
2342 ioctx
->ioctx
.cqe
.done
= srpt_send_done
;
2343 send_wr
.next
= NULL
;
2344 send_wr
.wr_cqe
= &ioctx
->ioctx
.cqe
;
2345 send_wr
.sg_list
= &sge
;
2346 send_wr
.num_sge
= 1;
2347 send_wr
.opcode
= IB_WR_SEND
;
2348 send_wr
.send_flags
= IB_SEND_SIGNALED
;
2350 ret
= ib_post_send(ch
->qp
, first_wr
, &bad_wr
);
2352 pr_err("%s: sending cmd response failed for tag %llu (%d)\n",
2353 __func__
, ioctx
->cmd
.tag
, ret
);
2360 atomic_add(1 + ioctx
->n_rdma
, &ch
->sq_wr_avail
);
2361 atomic_dec(&ch
->req_lim
);
2362 srpt_set_cmd_state(ioctx
, SRPT_STATE_DONE
);
2363 target_put_sess_cmd(&ioctx
->cmd
);
2366 static int srpt_queue_data_in(struct se_cmd
*cmd
)
2368 srpt_queue_response(cmd
);
2372 static void srpt_queue_tm_rsp(struct se_cmd
*cmd
)
2374 srpt_queue_response(cmd
);
2377 static void srpt_aborted_task(struct se_cmd
*cmd
)
2381 static int srpt_queue_status(struct se_cmd
*cmd
)
2383 struct srpt_send_ioctx
*ioctx
;
2385 ioctx
= container_of(cmd
, struct srpt_send_ioctx
, cmd
);
2386 BUG_ON(ioctx
->sense_data
!= cmd
->sense_buffer
);
2387 if (cmd
->se_cmd_flags
&
2388 (SCF_TRANSPORT_TASK_SENSE
| SCF_EMULATED_TASK_SENSE
))
2389 WARN_ON(cmd
->scsi_status
!= SAM_STAT_CHECK_CONDITION
);
2390 ioctx
->queue_status_only
= true;
2391 srpt_queue_response(cmd
);
2395 static void srpt_refresh_port_work(struct work_struct
*work
)
2397 struct srpt_port
*sport
= container_of(work
, struct srpt_port
, work
);
2399 srpt_refresh_port(sport
);
2403 * srpt_release_sdev() - Free the channel resources associated with a target.
2405 static int srpt_release_sdev(struct srpt_device
*sdev
)
2409 WARN_ON_ONCE(irqs_disabled());
2413 mutex_lock(&sdev
->mutex
);
2414 for (i
= 0; i
< ARRAY_SIZE(sdev
->port
); i
++)
2415 sdev
->port
[i
].enabled
= false;
2416 __srpt_close_all_ch(sdev
);
2417 mutex_unlock(&sdev
->mutex
);
2419 res
= wait_event_interruptible(sdev
->ch_releaseQ
,
2420 list_empty_careful(&sdev
->rch_list
));
2422 pr_err("%s: interrupted.\n", __func__
);
2427 static struct srpt_port
*__srpt_lookup_port(const char *name
)
2429 struct ib_device
*dev
;
2430 struct srpt_device
*sdev
;
2431 struct srpt_port
*sport
;
2434 list_for_each_entry(sdev
, &srpt_dev_list
, list
) {
2439 for (i
= 0; i
< dev
->phys_port_cnt
; i
++) {
2440 sport
= &sdev
->port
[i
];
2442 if (!strcmp(sport
->port_guid
, name
))
2450 static struct srpt_port
*srpt_lookup_port(const char *name
)
2452 struct srpt_port
*sport
;
2454 spin_lock(&srpt_dev_lock
);
2455 sport
= __srpt_lookup_port(name
);
2456 spin_unlock(&srpt_dev_lock
);
2462 * srpt_add_one() - Infiniband device addition callback function.
2464 static void srpt_add_one(struct ib_device
*device
)
2466 struct srpt_device
*sdev
;
2467 struct srpt_port
*sport
;
2468 struct ib_srq_init_attr srq_attr
;
2471 pr_debug("device = %p, device->dma_ops = %p\n", device
,
2474 sdev
= kzalloc(sizeof(*sdev
), GFP_KERNEL
);
2478 sdev
->device
= device
;
2479 INIT_LIST_HEAD(&sdev
->rch_list
);
2480 init_waitqueue_head(&sdev
->ch_releaseQ
);
2481 mutex_init(&sdev
->mutex
);
2483 sdev
->pd
= ib_alloc_pd(device
);
2484 if (IS_ERR(sdev
->pd
))
2487 sdev
->srq_size
= min(srpt_srq_size
, sdev
->device
->attrs
.max_srq_wr
);
2489 srq_attr
.event_handler
= srpt_srq_event
;
2490 srq_attr
.srq_context
= (void *)sdev
;
2491 srq_attr
.attr
.max_wr
= sdev
->srq_size
;
2492 srq_attr
.attr
.max_sge
= 1;
2493 srq_attr
.attr
.srq_limit
= 0;
2494 srq_attr
.srq_type
= IB_SRQT_BASIC
;
2496 sdev
->srq
= ib_create_srq(sdev
->pd
, &srq_attr
);
2497 if (IS_ERR(sdev
->srq
))
2500 pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n",
2501 __func__
, sdev
->srq_size
, sdev
->device
->attrs
.max_srq_wr
,
2504 if (!srpt_service_guid
)
2505 srpt_service_guid
= be64_to_cpu(device
->node_guid
);
2507 sdev
->cm_id
= ib_create_cm_id(device
, srpt_cm_handler
, sdev
);
2508 if (IS_ERR(sdev
->cm_id
))
2511 /* print out target login information */
2512 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,"
2513 "pkey=ffff,service_id=%016llx\n", srpt_service_guid
,
2514 srpt_service_guid
, srpt_service_guid
);
2517 * We do not have a consistent service_id (ie. also id_ext of target_id)
2518 * to identify this target. We currently use the guid of the first HCA
2519 * in the system as service_id; therefore, the target_id will change
2520 * if this HCA is gone bad and replaced by different HCA
2522 if (ib_cm_listen(sdev
->cm_id
, cpu_to_be64(srpt_service_guid
), 0))
2525 INIT_IB_EVENT_HANDLER(&sdev
->event_handler
, sdev
->device
,
2526 srpt_event_handler
);
2527 if (ib_register_event_handler(&sdev
->event_handler
))
2530 sdev
->ioctx_ring
= (struct srpt_recv_ioctx
**)
2531 srpt_alloc_ioctx_ring(sdev
, sdev
->srq_size
,
2532 sizeof(*sdev
->ioctx_ring
[0]),
2533 srp_max_req_size
, DMA_FROM_DEVICE
);
2534 if (!sdev
->ioctx_ring
)
2537 for (i
= 0; i
< sdev
->srq_size
; ++i
)
2538 srpt_post_recv(sdev
, sdev
->ioctx_ring
[i
]);
2540 WARN_ON(sdev
->device
->phys_port_cnt
> ARRAY_SIZE(sdev
->port
));
2542 for (i
= 1; i
<= sdev
->device
->phys_port_cnt
; i
++) {
2543 sport
= &sdev
->port
[i
- 1];
2546 sport
->port_attrib
.srp_max_rdma_size
= DEFAULT_MAX_RDMA_SIZE
;
2547 sport
->port_attrib
.srp_max_rsp_size
= DEFAULT_MAX_RSP_SIZE
;
2548 sport
->port_attrib
.srp_sq_size
= DEF_SRPT_SQ_SIZE
;
2549 INIT_WORK(&sport
->work
, srpt_refresh_port_work
);
2551 if (srpt_refresh_port(sport
)) {
2552 pr_err("MAD registration failed for %s-%d.\n",
2553 sdev
->device
->name
, i
);
2558 spin_lock(&srpt_dev_lock
);
2559 list_add_tail(&sdev
->list
, &srpt_dev_list
);
2560 spin_unlock(&srpt_dev_lock
);
2563 ib_set_client_data(device
, &srpt_client
, sdev
);
2564 pr_debug("added %s.\n", device
->name
);
2568 srpt_free_ioctx_ring((struct srpt_ioctx
**)sdev
->ioctx_ring
, sdev
,
2569 sdev
->srq_size
, srp_max_req_size
,
2572 ib_unregister_event_handler(&sdev
->event_handler
);
2574 ib_destroy_cm_id(sdev
->cm_id
);
2576 ib_destroy_srq(sdev
->srq
);
2578 ib_dealloc_pd(sdev
->pd
);
2583 pr_info("%s(%s) failed.\n", __func__
, device
->name
);
2588 * srpt_remove_one() - InfiniBand device removal callback function.
2590 static void srpt_remove_one(struct ib_device
*device
, void *client_data
)
2592 struct srpt_device
*sdev
= client_data
;
2596 pr_info("%s(%s): nothing to do.\n", __func__
, device
->name
);
2600 srpt_unregister_mad_agent(sdev
);
2602 ib_unregister_event_handler(&sdev
->event_handler
);
2604 /* Cancel any work queued by the just unregistered IB event handler. */
2605 for (i
= 0; i
< sdev
->device
->phys_port_cnt
; i
++)
2606 cancel_work_sync(&sdev
->port
[i
].work
);
2608 ib_destroy_cm_id(sdev
->cm_id
);
2611 * Unregistering a target must happen after destroying sdev->cm_id
2612 * such that no new SRP_LOGIN_REQ information units can arrive while
2613 * destroying the target.
2615 spin_lock(&srpt_dev_lock
);
2616 list_del(&sdev
->list
);
2617 spin_unlock(&srpt_dev_lock
);
2618 srpt_release_sdev(sdev
);
2620 ib_destroy_srq(sdev
->srq
);
2621 ib_dealloc_pd(sdev
->pd
);
2623 srpt_free_ioctx_ring((struct srpt_ioctx
**)sdev
->ioctx_ring
, sdev
,
2624 sdev
->srq_size
, srp_max_req_size
, DMA_FROM_DEVICE
);
2625 sdev
->ioctx_ring
= NULL
;
2629 static struct ib_client srpt_client
= {
2631 .add
= srpt_add_one
,
2632 .remove
= srpt_remove_one
2635 static int srpt_check_true(struct se_portal_group
*se_tpg
)
2640 static int srpt_check_false(struct se_portal_group
*se_tpg
)
2645 static char *srpt_get_fabric_name(void)
2650 static char *srpt_get_fabric_wwn(struct se_portal_group
*tpg
)
2652 struct srpt_port
*sport
= container_of(tpg
, struct srpt_port
, port_tpg_1
);
2654 return sport
->port_guid
;
2657 static u16
srpt_get_tag(struct se_portal_group
*tpg
)
2662 static u32
srpt_tpg_get_inst_index(struct se_portal_group
*se_tpg
)
2667 static void srpt_release_cmd(struct se_cmd
*se_cmd
)
2669 struct srpt_send_ioctx
*ioctx
= container_of(se_cmd
,
2670 struct srpt_send_ioctx
, cmd
);
2671 struct srpt_rdma_ch
*ch
= ioctx
->ch
;
2672 unsigned long flags
;
2674 WARN_ON(ioctx
->state
!= SRPT_STATE_DONE
);
2676 if (ioctx
->n_rw_ctx
) {
2677 srpt_free_rw_ctxs(ch
, ioctx
);
2678 ioctx
->n_rw_ctx
= 0;
2681 spin_lock_irqsave(&ch
->spinlock
, flags
);
2682 list_add(&ioctx
->free_list
, &ch
->free_list
);
2683 spin_unlock_irqrestore(&ch
->spinlock
, flags
);
2687 * srpt_close_session() - Forcibly close a session.
2689 * Callback function invoked by the TCM core to clean up sessions associated
2690 * with a node ACL when the user invokes
2691 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
2693 static void srpt_close_session(struct se_session
*se_sess
)
2695 DECLARE_COMPLETION_ONSTACK(release_done
);
2696 struct srpt_rdma_ch
*ch
= se_sess
->fabric_sess_ptr
;
2697 struct srpt_device
*sdev
= ch
->sport
->sdev
;
2700 pr_debug("ch %s-%d state %d\n", ch
->sess_name
, ch
->qp
->qp_num
,
2703 mutex_lock(&sdev
->mutex
);
2704 BUG_ON(ch
->release_done
);
2705 ch
->release_done
= &release_done
;
2706 wait
= !list_empty(&ch
->list
);
2707 srpt_disconnect_ch(ch
);
2708 mutex_unlock(&sdev
->mutex
);
2713 while (wait_for_completion_timeout(&release_done
, 180 * HZ
) == 0)
2714 pr_info("%s(%s-%d state %d): still waiting ...\n", __func__
,
2715 ch
->sess_name
, ch
->qp
->qp_num
, ch
->state
);
2719 * srpt_sess_get_index() - Return the value of scsiAttIntrPortIndex (SCSI-MIB).
2721 * A quote from RFC 4455 (SCSI-MIB) about this MIB object:
2722 * This object represents an arbitrary integer used to uniquely identify a
2723 * particular attached remote initiator port to a particular SCSI target port
2724 * within a particular SCSI target device within a particular SCSI instance.
2726 static u32
srpt_sess_get_index(struct se_session
*se_sess
)
2731 static void srpt_set_default_node_attrs(struct se_node_acl
*nacl
)
2735 /* Note: only used from inside debug printk's by the TCM core. */
2736 static int srpt_get_tcm_cmd_state(struct se_cmd
*se_cmd
)
2738 struct srpt_send_ioctx
*ioctx
;
2740 ioctx
= container_of(se_cmd
, struct srpt_send_ioctx
, cmd
);
2741 return srpt_get_cmd_state(ioctx
);
2745 * srpt_parse_i_port_id() - Parse an initiator port ID.
2746 * @name: ASCII representation of a 128-bit initiator port ID.
2747 * @i_port_id: Binary 128-bit port ID.
2749 static int srpt_parse_i_port_id(u8 i_port_id
[16], const char *name
)
2752 unsigned len
, count
, leading_zero_bytes
;
2756 if (strncasecmp(p
, "0x", 2) == 0)
2762 count
= min(len
/ 2, 16U);
2763 leading_zero_bytes
= 16 - count
;
2764 memset(i_port_id
, 0, leading_zero_bytes
);
2765 rc
= hex2bin(i_port_id
+ leading_zero_bytes
, p
, count
);
2767 pr_debug("hex2bin failed for srpt_parse_i_port_id: %d\n", rc
);
2774 * configfs callback function invoked for
2775 * mkdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
2777 static int srpt_init_nodeacl(struct se_node_acl
*se_nacl
, const char *name
)
2781 if (srpt_parse_i_port_id(i_port_id
, name
) < 0) {
2782 pr_err("invalid initiator port ID %s\n", name
);
2788 static ssize_t
srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item
*item
,
2791 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
2792 struct srpt_port
*sport
= container_of(se_tpg
, struct srpt_port
, port_tpg_1
);
2794 return sprintf(page
, "%u\n", sport
->port_attrib
.srp_max_rdma_size
);
2797 static ssize_t
srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item
*item
,
2798 const char *page
, size_t count
)
2800 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
2801 struct srpt_port
*sport
= container_of(se_tpg
, struct srpt_port
, port_tpg_1
);
2805 ret
= kstrtoul(page
, 0, &val
);
2807 pr_err("kstrtoul() failed with ret: %d\n", ret
);
2810 if (val
> MAX_SRPT_RDMA_SIZE
) {
2811 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val
,
2812 MAX_SRPT_RDMA_SIZE
);
2815 if (val
< DEFAULT_MAX_RDMA_SIZE
) {
2816 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
2817 val
, DEFAULT_MAX_RDMA_SIZE
);
2820 sport
->port_attrib
.srp_max_rdma_size
= val
;
2825 static ssize_t
srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item
*item
,
2828 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
2829 struct srpt_port
*sport
= container_of(se_tpg
, struct srpt_port
, port_tpg_1
);
2831 return sprintf(page
, "%u\n", sport
->port_attrib
.srp_max_rsp_size
);
2834 static ssize_t
srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item
*item
,
2835 const char *page
, size_t count
)
2837 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
2838 struct srpt_port
*sport
= container_of(se_tpg
, struct srpt_port
, port_tpg_1
);
2842 ret
= kstrtoul(page
, 0, &val
);
2844 pr_err("kstrtoul() failed with ret: %d\n", ret
);
2847 if (val
> MAX_SRPT_RSP_SIZE
) {
2848 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val
,
2852 if (val
< MIN_MAX_RSP_SIZE
) {
2853 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val
,
2857 sport
->port_attrib
.srp_max_rsp_size
= val
;
2862 static ssize_t
srpt_tpg_attrib_srp_sq_size_show(struct config_item
*item
,
2865 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
2866 struct srpt_port
*sport
= container_of(se_tpg
, struct srpt_port
, port_tpg_1
);
2868 return sprintf(page
, "%u\n", sport
->port_attrib
.srp_sq_size
);
2871 static ssize_t
srpt_tpg_attrib_srp_sq_size_store(struct config_item
*item
,
2872 const char *page
, size_t count
)
2874 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
2875 struct srpt_port
*sport
= container_of(se_tpg
, struct srpt_port
, port_tpg_1
);
2879 ret
= kstrtoul(page
, 0, &val
);
2881 pr_err("kstrtoul() failed with ret: %d\n", ret
);
2884 if (val
> MAX_SRPT_SRQ_SIZE
) {
2885 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val
,
2889 if (val
< MIN_SRPT_SRQ_SIZE
) {
2890 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val
,
2894 sport
->port_attrib
.srp_sq_size
= val
;
2899 CONFIGFS_ATTR(srpt_tpg_attrib_
, srp_max_rdma_size
);
2900 CONFIGFS_ATTR(srpt_tpg_attrib_
, srp_max_rsp_size
);
2901 CONFIGFS_ATTR(srpt_tpg_attrib_
, srp_sq_size
);
2903 static struct configfs_attribute
*srpt_tpg_attrib_attrs
[] = {
2904 &srpt_tpg_attrib_attr_srp_max_rdma_size
,
2905 &srpt_tpg_attrib_attr_srp_max_rsp_size
,
2906 &srpt_tpg_attrib_attr_srp_sq_size
,
2910 static ssize_t
srpt_tpg_enable_show(struct config_item
*item
, char *page
)
2912 struct se_portal_group
*se_tpg
= to_tpg(item
);
2913 struct srpt_port
*sport
= container_of(se_tpg
, struct srpt_port
, port_tpg_1
);
2915 return snprintf(page
, PAGE_SIZE
, "%d\n", (sport
->enabled
) ? 1: 0);
2918 static ssize_t
srpt_tpg_enable_store(struct config_item
*item
,
2919 const char *page
, size_t count
)
2921 struct se_portal_group
*se_tpg
= to_tpg(item
);
2922 struct srpt_port
*sport
= container_of(se_tpg
, struct srpt_port
, port_tpg_1
);
2923 struct srpt_device
*sdev
= sport
->sdev
;
2924 struct srpt_rdma_ch
*ch
;
2928 ret
= kstrtoul(page
, 0, &tmp
);
2930 pr_err("Unable to extract srpt_tpg_store_enable\n");
2934 if ((tmp
!= 0) && (tmp
!= 1)) {
2935 pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp
);
2938 if (sport
->enabled
== tmp
)
2940 sport
->enabled
= tmp
;
2944 mutex_lock(&sdev
->mutex
);
2945 list_for_each_entry(ch
, &sdev
->rch_list
, list
) {
2946 if (ch
->sport
== sport
) {
2947 pr_debug("%s: ch %p %s-%d\n", __func__
, ch
,
2948 ch
->sess_name
, ch
->qp
->qp_num
);
2949 srpt_disconnect_ch(ch
);
2953 mutex_unlock(&sdev
->mutex
);
2959 CONFIGFS_ATTR(srpt_tpg_
, enable
);
2961 static struct configfs_attribute
*srpt_tpg_attrs
[] = {
2962 &srpt_tpg_attr_enable
,
2967 * configfs callback invoked for
2968 * mkdir /sys/kernel/config/target/$driver/$port/$tpg
2970 static struct se_portal_group
*srpt_make_tpg(struct se_wwn
*wwn
,
2971 struct config_group
*group
,
2974 struct srpt_port
*sport
= container_of(wwn
, struct srpt_port
, port_wwn
);
2977 /* Initialize sport->port_wwn and sport->port_tpg_1 */
2978 res
= core_tpg_register(&sport
->port_wwn
, &sport
->port_tpg_1
, SCSI_PROTOCOL_SRP
);
2980 return ERR_PTR(res
);
2982 return &sport
->port_tpg_1
;
2986 * configfs callback invoked for
2987 * rmdir /sys/kernel/config/target/$driver/$port/$tpg
2989 static void srpt_drop_tpg(struct se_portal_group
*tpg
)
2991 struct srpt_port
*sport
= container_of(tpg
,
2992 struct srpt_port
, port_tpg_1
);
2994 sport
->enabled
= false;
2995 core_tpg_deregister(&sport
->port_tpg_1
);
2999 * configfs callback invoked for
3000 * mkdir /sys/kernel/config/target/$driver/$port
3002 static struct se_wwn
*srpt_make_tport(struct target_fabric_configfs
*tf
,
3003 struct config_group
*group
,
3006 struct srpt_port
*sport
;
3009 sport
= srpt_lookup_port(name
);
3010 pr_debug("make_tport(%s)\n", name
);
3015 return &sport
->port_wwn
;
3018 return ERR_PTR(ret
);
3022 * configfs callback invoked for
3023 * rmdir /sys/kernel/config/target/$driver/$port
3025 static void srpt_drop_tport(struct se_wwn
*wwn
)
3027 struct srpt_port
*sport
= container_of(wwn
, struct srpt_port
, port_wwn
);
3029 pr_debug("drop_tport(%s\n", config_item_name(&sport
->port_wwn
.wwn_group
.cg_item
));
3032 static ssize_t
srpt_wwn_version_show(struct config_item
*item
, char *buf
)
3034 return scnprintf(buf
, PAGE_SIZE
, "%s\n", DRV_VERSION
);
3037 CONFIGFS_ATTR_RO(srpt_wwn_
, version
);
3039 static struct configfs_attribute
*srpt_wwn_attrs
[] = {
3040 &srpt_wwn_attr_version
,
3044 static const struct target_core_fabric_ops srpt_template
= {
3045 .module
= THIS_MODULE
,
3047 .get_fabric_name
= srpt_get_fabric_name
,
3048 .tpg_get_wwn
= srpt_get_fabric_wwn
,
3049 .tpg_get_tag
= srpt_get_tag
,
3050 .tpg_check_demo_mode
= srpt_check_false
,
3051 .tpg_check_demo_mode_cache
= srpt_check_true
,
3052 .tpg_check_demo_mode_write_protect
= srpt_check_true
,
3053 .tpg_check_prod_mode_write_protect
= srpt_check_false
,
3054 .tpg_get_inst_index
= srpt_tpg_get_inst_index
,
3055 .release_cmd
= srpt_release_cmd
,
3056 .check_stop_free
= srpt_check_stop_free
,
3057 .close_session
= srpt_close_session
,
3058 .sess_get_index
= srpt_sess_get_index
,
3059 .sess_get_initiator_sid
= NULL
,
3060 .write_pending
= srpt_write_pending
,
3061 .write_pending_status
= srpt_write_pending_status
,
3062 .set_default_node_attributes
= srpt_set_default_node_attrs
,
3063 .get_cmd_state
= srpt_get_tcm_cmd_state
,
3064 .queue_data_in
= srpt_queue_data_in
,
3065 .queue_status
= srpt_queue_status
,
3066 .queue_tm_rsp
= srpt_queue_tm_rsp
,
3067 .aborted_task
= srpt_aborted_task
,
3069 * Setup function pointers for generic logic in
3070 * target_core_fabric_configfs.c
3072 .fabric_make_wwn
= srpt_make_tport
,
3073 .fabric_drop_wwn
= srpt_drop_tport
,
3074 .fabric_make_tpg
= srpt_make_tpg
,
3075 .fabric_drop_tpg
= srpt_drop_tpg
,
3076 .fabric_init_nodeacl
= srpt_init_nodeacl
,
3078 .tfc_wwn_attrs
= srpt_wwn_attrs
,
3079 .tfc_tpg_base_attrs
= srpt_tpg_attrs
,
3080 .tfc_tpg_attrib_attrs
= srpt_tpg_attrib_attrs
,
3084 * srpt_init_module() - Kernel module initialization.
3086 * Note: Since ib_register_client() registers callback functions, and since at
3087 * least one of these callback functions (srpt_add_one()) calls target core
3088 * functions, this driver must be registered with the target core before
3089 * ib_register_client() is called.
3091 static int __init
srpt_init_module(void)
3096 if (srp_max_req_size
< MIN_MAX_REQ_SIZE
) {
3097 pr_err("invalid value %d for kernel module parameter"
3098 " srp_max_req_size -- must be at least %d.\n",
3099 srp_max_req_size
, MIN_MAX_REQ_SIZE
);
3103 if (srpt_srq_size
< MIN_SRPT_SRQ_SIZE
3104 || srpt_srq_size
> MAX_SRPT_SRQ_SIZE
) {
3105 pr_err("invalid value %d for kernel module parameter"
3106 " srpt_srq_size -- must be in the range [%d..%d].\n",
3107 srpt_srq_size
, MIN_SRPT_SRQ_SIZE
, MAX_SRPT_SRQ_SIZE
);
3111 ret
= target_register_template(&srpt_template
);
3115 ret
= ib_register_client(&srpt_client
);
3117 pr_err("couldn't register IB client\n");
3118 goto out_unregister_target
;
3123 out_unregister_target
:
3124 target_unregister_template(&srpt_template
);
3129 static void __exit
srpt_cleanup_module(void)
3131 ib_unregister_client(&srpt_client
);
3132 target_unregister_template(&srpt_template
);
3135 module_init(srpt_init_module
);
3136 module_exit(srpt_cleanup_module
);