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 <linux/inet.h>
45 #include <rdma/ib_cache.h>
46 #include <scsi/scsi_proto.h>
47 #include <scsi/scsi_tcq.h>
48 #include <target/target_core_base.h>
49 #include <target/target_core_fabric.h>
52 /* Name of this kernel module. */
53 #define DRV_NAME "ib_srpt"
54 #define DRV_VERSION "2.0.0"
55 #define DRV_RELDATE "2011-02-14"
57 #define SRPT_ID_STRING "Linux SRP target"
60 #define pr_fmt(fmt) DRV_NAME " " fmt
62 MODULE_AUTHOR("Vu Pham and Bart Van Assche");
63 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target "
64 "v" DRV_VERSION
" (" DRV_RELDATE
")");
65 MODULE_LICENSE("Dual BSD/GPL");
71 static u64 srpt_service_guid
;
72 static DEFINE_SPINLOCK(srpt_dev_lock
); /* Protects srpt_dev_list. */
73 static LIST_HEAD(srpt_dev_list
); /* List of srpt_device structures. */
75 static unsigned srp_max_req_size
= DEFAULT_MAX_REQ_SIZE
;
76 module_param(srp_max_req_size
, int, 0444);
77 MODULE_PARM_DESC(srp_max_req_size
,
78 "Maximum size of SRP request messages in bytes.");
80 static int srpt_srq_size
= DEFAULT_SRPT_SRQ_SIZE
;
81 module_param(srpt_srq_size
, int, 0444);
82 MODULE_PARM_DESC(srpt_srq_size
,
83 "Shared receive queue (SRQ) size.");
85 static int srpt_get_u64_x(char *buffer
, const struct kernel_param
*kp
)
87 return sprintf(buffer
, "0x%016llx", *(u64
*)kp
->arg
);
89 module_param_call(srpt_service_guid
, NULL
, srpt_get_u64_x
, &srpt_service_guid
,
91 MODULE_PARM_DESC(srpt_service_guid
,
92 "Using this value for ioc_guid, id_ext, and cm_listen_id"
93 " instead of using the node_guid of the first HCA.");
95 static struct ib_client srpt_client
;
96 /* Protects both rdma_cm_port and rdma_cm_id. */
97 static DEFINE_MUTEX(rdma_cm_mutex
);
98 /* Port number RDMA/CM will bind to. */
99 static u16 rdma_cm_port
;
100 static struct rdma_cm_id
*rdma_cm_id
;
101 static void srpt_release_cmd(struct se_cmd
*se_cmd
);
102 static void srpt_free_ch(struct kref
*kref
);
103 static int srpt_queue_status(struct se_cmd
*cmd
);
104 static void srpt_recv_done(struct ib_cq
*cq
, struct ib_wc
*wc
);
105 static void srpt_send_done(struct ib_cq
*cq
, struct ib_wc
*wc
);
106 static void srpt_process_wait_list(struct srpt_rdma_ch
*ch
);
109 * The only allowed channel state changes are those that change the channel
110 * state into a state with a higher numerical value. Hence the new > prev test.
112 static bool srpt_set_ch_state(struct srpt_rdma_ch
*ch
, enum rdma_ch_state
new)
115 enum rdma_ch_state prev
;
116 bool changed
= false;
118 spin_lock_irqsave(&ch
->spinlock
, flags
);
124 spin_unlock_irqrestore(&ch
->spinlock
, flags
);
130 * srpt_event_handler - asynchronous IB event callback function
131 * @handler: IB event handler registered by ib_register_event_handler().
132 * @event: Description of the event that occurred.
134 * Callback function called by the InfiniBand core when an asynchronous IB
135 * event occurs. This callback may occur in interrupt context. See also
136 * section 11.5.2, Set Asynchronous Event Handler in the InfiniBand
137 * Architecture Specification.
139 static void srpt_event_handler(struct ib_event_handler
*handler
,
140 struct ib_event
*event
)
142 struct srpt_device
*sdev
;
143 struct srpt_port
*sport
;
146 sdev
= ib_get_client_data(event
->device
, &srpt_client
);
147 if (!sdev
|| sdev
->device
!= event
->device
)
150 pr_debug("ASYNC event= %d on device= %s\n", event
->event
,
153 switch (event
->event
) {
154 case IB_EVENT_PORT_ERR
:
155 port_num
= event
->element
.port_num
- 1;
156 if (port_num
< sdev
->device
->phys_port_cnt
) {
157 sport
= &sdev
->port
[port_num
];
161 WARN(true, "event %d: port_num %d out of range 1..%d\n",
162 event
->event
, port_num
+ 1,
163 sdev
->device
->phys_port_cnt
);
166 case IB_EVENT_PORT_ACTIVE
:
167 case IB_EVENT_LID_CHANGE
:
168 case IB_EVENT_PKEY_CHANGE
:
169 case IB_EVENT_SM_CHANGE
:
170 case IB_EVENT_CLIENT_REREGISTER
:
171 case IB_EVENT_GID_CHANGE
:
172 /* Refresh port data asynchronously. */
173 port_num
= event
->element
.port_num
- 1;
174 if (port_num
< sdev
->device
->phys_port_cnt
) {
175 sport
= &sdev
->port
[port_num
];
176 if (!sport
->lid
&& !sport
->sm_lid
)
177 schedule_work(&sport
->work
);
179 WARN(true, "event %d: port_num %d out of range 1..%d\n",
180 event
->event
, port_num
+ 1,
181 sdev
->device
->phys_port_cnt
);
185 pr_err("received unrecognized IB event %d\n", event
->event
);
191 * srpt_srq_event - SRQ event callback function
192 * @event: Description of the event that occurred.
193 * @ctx: Context pointer specified at SRQ creation time.
195 static void srpt_srq_event(struct ib_event
*event
, void *ctx
)
197 pr_debug("SRQ event %d\n", event
->event
);
200 static const char *get_ch_state_name(enum rdma_ch_state s
)
207 case CH_DISCONNECTING
:
208 return "disconnecting";
211 case CH_DISCONNECTED
:
212 return "disconnected";
218 * srpt_qp_event - QP event callback function
219 * @event: Description of the event that occurred.
220 * @ch: SRPT RDMA channel.
222 static void srpt_qp_event(struct ib_event
*event
, struct srpt_rdma_ch
*ch
)
224 pr_debug("QP event %d on ch=%p sess_name=%s state=%d\n",
225 event
->event
, ch
, ch
->sess_name
, ch
->state
);
227 switch (event
->event
) {
228 case IB_EVENT_COMM_EST
:
229 if (ch
->using_rdma_cm
)
230 rdma_notify(ch
->rdma_cm
.cm_id
, event
->event
);
232 ib_cm_notify(ch
->ib_cm
.cm_id
, event
->event
);
234 case IB_EVENT_QP_LAST_WQE_REACHED
:
235 pr_debug("%s-%d, state %s: received Last WQE event.\n",
236 ch
->sess_name
, ch
->qp
->qp_num
,
237 get_ch_state_name(ch
->state
));
240 pr_err("received unrecognized IB QP event %d\n", event
->event
);
246 * srpt_set_ioc - initialize a IOUnitInfo structure
247 * @c_list: controller list.
248 * @slot: one-based slot number.
249 * @value: four-bit value.
251 * Copies the lowest four bits of value in element slot of the array of four
252 * bit elements called c_list (controller list). The index slot is one-based.
254 static void srpt_set_ioc(u8
*c_list
, u32 slot
, u8 value
)
261 tmp
= c_list
[id
] & 0xf;
262 c_list
[id
] = (value
<< 4) | tmp
;
264 tmp
= c_list
[id
] & 0xf0;
265 c_list
[id
] = (value
& 0xf) | tmp
;
270 * srpt_get_class_port_info - copy ClassPortInfo to a management datagram
271 * @mad: Datagram that will be sent as response to DM_ATTR_CLASS_PORT_INFO.
273 * See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture
276 static void srpt_get_class_port_info(struct ib_dm_mad
*mad
)
278 struct ib_class_port_info
*cif
;
280 cif
= (struct ib_class_port_info
*)mad
->data
;
281 memset(cif
, 0, sizeof(*cif
));
282 cif
->base_version
= 1;
283 cif
->class_version
= 1;
285 ib_set_cpi_resp_time(cif
, 20);
286 mad
->mad_hdr
.status
= 0;
290 * srpt_get_iou - write IOUnitInfo to a management datagram
291 * @mad: Datagram that will be sent as response to DM_ATTR_IOU_INFO.
293 * See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
294 * Specification. See also section B.7, table B.6 in the SRP r16a document.
296 static void srpt_get_iou(struct ib_dm_mad
*mad
)
298 struct ib_dm_iou_info
*ioui
;
302 ioui
= (struct ib_dm_iou_info
*)mad
->data
;
303 ioui
->change_id
= cpu_to_be16(1);
304 ioui
->max_controllers
= 16;
306 /* set present for slot 1 and empty for the rest */
307 srpt_set_ioc(ioui
->controller_list
, 1, 1);
308 for (i
= 1, slot
= 2; i
< 16; i
++, slot
++)
309 srpt_set_ioc(ioui
->controller_list
, slot
, 0);
311 mad
->mad_hdr
.status
= 0;
315 * srpt_get_ioc - write IOControllerprofile to a management datagram
316 * @sport: HCA port through which the MAD has been received.
317 * @slot: Slot number specified in DM_ATTR_IOC_PROFILE query.
318 * @mad: Datagram that will be sent as response to DM_ATTR_IOC_PROFILE.
320 * See also section 16.3.3.4 IOControllerProfile in the InfiniBand
321 * Architecture Specification. See also section B.7, table B.7 in the SRP
324 static void srpt_get_ioc(struct srpt_port
*sport
, u32 slot
,
325 struct ib_dm_mad
*mad
)
327 struct srpt_device
*sdev
= sport
->sdev
;
328 struct ib_dm_ioc_profile
*iocp
;
329 int send_queue_depth
;
331 iocp
= (struct ib_dm_ioc_profile
*)mad
->data
;
333 if (!slot
|| slot
> 16) {
335 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD
);
341 = cpu_to_be16(DM_MAD_STATUS_NO_IOC
);
346 send_queue_depth
= sdev
->srq_size
;
348 send_queue_depth
= min(MAX_SRPT_RQ_SIZE
,
349 sdev
->device
->attrs
.max_qp_wr
);
351 memset(iocp
, 0, sizeof(*iocp
));
352 strcpy(iocp
->id_string
, SRPT_ID_STRING
);
353 iocp
->guid
= cpu_to_be64(srpt_service_guid
);
354 iocp
->vendor_id
= cpu_to_be32(sdev
->device
->attrs
.vendor_id
);
355 iocp
->device_id
= cpu_to_be32(sdev
->device
->attrs
.vendor_part_id
);
356 iocp
->device_version
= cpu_to_be16(sdev
->device
->attrs
.hw_ver
);
357 iocp
->subsys_vendor_id
= cpu_to_be32(sdev
->device
->attrs
.vendor_id
);
358 iocp
->subsys_device_id
= 0x0;
359 iocp
->io_class
= cpu_to_be16(SRP_REV16A_IB_IO_CLASS
);
360 iocp
->io_subclass
= cpu_to_be16(SRP_IO_SUBCLASS
);
361 iocp
->protocol
= cpu_to_be16(SRP_PROTOCOL
);
362 iocp
->protocol_version
= cpu_to_be16(SRP_PROTOCOL_VERSION
);
363 iocp
->send_queue_depth
= cpu_to_be16(send_queue_depth
);
364 iocp
->rdma_read_depth
= 4;
365 iocp
->send_size
= cpu_to_be32(srp_max_req_size
);
366 iocp
->rdma_size
= cpu_to_be32(min(sport
->port_attrib
.srp_max_rdma_size
,
368 iocp
->num_svc_entries
= 1;
369 iocp
->op_cap_mask
= SRP_SEND_TO_IOC
| SRP_SEND_FROM_IOC
|
370 SRP_RDMA_READ_FROM_IOC
| SRP_RDMA_WRITE_FROM_IOC
;
372 mad
->mad_hdr
.status
= 0;
376 * srpt_get_svc_entries - write ServiceEntries to a management datagram
377 * @ioc_guid: I/O controller GUID to use in reply.
378 * @slot: I/O controller number.
379 * @hi: End of the range of service entries to be specified in the reply.
380 * @lo: Start of the range of service entries to be specified in the reply..
381 * @mad: Datagram that will be sent as response to DM_ATTR_SVC_ENTRIES.
383 * See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
384 * Specification. See also section B.7, table B.8 in the SRP r16a document.
386 static void srpt_get_svc_entries(u64 ioc_guid
,
387 u16 slot
, u8 hi
, u8 lo
, struct ib_dm_mad
*mad
)
389 struct ib_dm_svc_entries
*svc_entries
;
393 if (!slot
|| slot
> 16) {
395 = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD
);
399 if (slot
> 2 || lo
> hi
|| hi
> 1) {
401 = cpu_to_be16(DM_MAD_STATUS_NO_IOC
);
405 svc_entries
= (struct ib_dm_svc_entries
*)mad
->data
;
406 memset(svc_entries
, 0, sizeof(*svc_entries
));
407 svc_entries
->service_entries
[0].id
= cpu_to_be64(ioc_guid
);
408 snprintf(svc_entries
->service_entries
[0].name
,
409 sizeof(svc_entries
->service_entries
[0].name
),
411 SRP_SERVICE_NAME_PREFIX
,
414 mad
->mad_hdr
.status
= 0;
418 * srpt_mgmt_method_get - process a received management datagram
419 * @sp: HCA port through which the MAD has been received.
420 * @rq_mad: received MAD.
421 * @rsp_mad: response MAD.
423 static void srpt_mgmt_method_get(struct srpt_port
*sp
, struct ib_mad
*rq_mad
,
424 struct ib_dm_mad
*rsp_mad
)
430 attr_id
= be16_to_cpu(rq_mad
->mad_hdr
.attr_id
);
432 case DM_ATTR_CLASS_PORT_INFO
:
433 srpt_get_class_port_info(rsp_mad
);
435 case DM_ATTR_IOU_INFO
:
436 srpt_get_iou(rsp_mad
);
438 case DM_ATTR_IOC_PROFILE
:
439 slot
= be32_to_cpu(rq_mad
->mad_hdr
.attr_mod
);
440 srpt_get_ioc(sp
, slot
, rsp_mad
);
442 case DM_ATTR_SVC_ENTRIES
:
443 slot
= be32_to_cpu(rq_mad
->mad_hdr
.attr_mod
);
444 hi
= (u8
) ((slot
>> 8) & 0xff);
445 lo
= (u8
) (slot
& 0xff);
446 slot
= (u16
) ((slot
>> 16) & 0xffff);
447 srpt_get_svc_entries(srpt_service_guid
,
448 slot
, hi
, lo
, rsp_mad
);
451 rsp_mad
->mad_hdr
.status
=
452 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR
);
458 * srpt_mad_send_handler - MAD send completion callback
459 * @mad_agent: Return value of ib_register_mad_agent().
460 * @mad_wc: Work completion reporting that the MAD has been sent.
462 static void srpt_mad_send_handler(struct ib_mad_agent
*mad_agent
,
463 struct ib_mad_send_wc
*mad_wc
)
465 rdma_destroy_ah(mad_wc
->send_buf
->ah
);
466 ib_free_send_mad(mad_wc
->send_buf
);
470 * srpt_mad_recv_handler - MAD reception callback function
471 * @mad_agent: Return value of ib_register_mad_agent().
472 * @send_buf: Not used.
473 * @mad_wc: Work completion reporting that a MAD has been received.
475 static void srpt_mad_recv_handler(struct ib_mad_agent
*mad_agent
,
476 struct ib_mad_send_buf
*send_buf
,
477 struct ib_mad_recv_wc
*mad_wc
)
479 struct srpt_port
*sport
= (struct srpt_port
*)mad_agent
->context
;
481 struct ib_mad_send_buf
*rsp
;
482 struct ib_dm_mad
*dm_mad
;
484 if (!mad_wc
|| !mad_wc
->recv_buf
.mad
)
487 ah
= ib_create_ah_from_wc(mad_agent
->qp
->pd
, mad_wc
->wc
,
488 mad_wc
->recv_buf
.grh
, mad_agent
->port_num
);
492 BUILD_BUG_ON(offsetof(struct ib_dm_mad
, data
) != IB_MGMT_DEVICE_HDR
);
494 rsp
= ib_create_send_mad(mad_agent
, mad_wc
->wc
->src_qp
,
495 mad_wc
->wc
->pkey_index
, 0,
496 IB_MGMT_DEVICE_HDR
, IB_MGMT_DEVICE_DATA
,
498 IB_MGMT_BASE_VERSION
);
505 memcpy(dm_mad
, mad_wc
->recv_buf
.mad
, sizeof(*dm_mad
));
506 dm_mad
->mad_hdr
.method
= IB_MGMT_METHOD_GET_RESP
;
507 dm_mad
->mad_hdr
.status
= 0;
509 switch (mad_wc
->recv_buf
.mad
->mad_hdr
.method
) {
510 case IB_MGMT_METHOD_GET
:
511 srpt_mgmt_method_get(sport
, mad_wc
->recv_buf
.mad
, dm_mad
);
513 case IB_MGMT_METHOD_SET
:
514 dm_mad
->mad_hdr
.status
=
515 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR
);
518 dm_mad
->mad_hdr
.status
=
519 cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD
);
523 if (!ib_post_send_mad(rsp
, NULL
)) {
524 ib_free_recv_mad(mad_wc
);
525 /* will destroy_ah & free_send_mad in send completion */
529 ib_free_send_mad(rsp
);
534 ib_free_recv_mad(mad_wc
);
537 static int srpt_format_guid(char *buf
, unsigned int size
, const __be64
*guid
)
539 const __be16
*g
= (const __be16
*)guid
;
541 return snprintf(buf
, size
, "%04x:%04x:%04x:%04x",
542 be16_to_cpu(g
[0]), be16_to_cpu(g
[1]),
543 be16_to_cpu(g
[2]), be16_to_cpu(g
[3]));
547 * srpt_refresh_port - configure a HCA port
548 * @sport: SRPT HCA port.
550 * Enable InfiniBand management datagram processing, update the cached sm_lid,
551 * lid and gid values, and register a callback function for processing MADs
552 * on the specified port.
554 * Note: It is safe to call this function more than once for the same port.
556 static int srpt_refresh_port(struct srpt_port
*sport
)
558 struct ib_mad_reg_req reg_req
;
559 struct ib_port_modify port_modify
;
560 struct ib_port_attr port_attr
;
563 memset(&port_modify
, 0, sizeof(port_modify
));
564 port_modify
.set_port_cap_mask
= IB_PORT_DEVICE_MGMT_SUP
;
565 port_modify
.clr_port_cap_mask
= 0;
567 ret
= ib_modify_port(sport
->sdev
->device
, sport
->port
, 0, &port_modify
);
571 ret
= ib_query_port(sport
->sdev
->device
, sport
->port
, &port_attr
);
575 sport
->sm_lid
= port_attr
.sm_lid
;
576 sport
->lid
= port_attr
.lid
;
578 ret
= ib_query_gid(sport
->sdev
->device
, sport
->port
, 0, &sport
->gid
,
583 sport
->port_guid_wwn
.priv
= sport
;
584 srpt_format_guid(sport
->port_guid
, sizeof(sport
->port_guid
),
585 &sport
->gid
.global
.interface_id
);
586 sport
->port_gid_wwn
.priv
= sport
;
587 snprintf(sport
->port_gid
, sizeof(sport
->port_gid
),
589 be64_to_cpu(sport
->gid
.global
.subnet_prefix
),
590 be64_to_cpu(sport
->gid
.global
.interface_id
));
592 if (!sport
->mad_agent
) {
593 memset(®_req
, 0, sizeof(reg_req
));
594 reg_req
.mgmt_class
= IB_MGMT_CLASS_DEVICE_MGMT
;
595 reg_req
.mgmt_class_version
= IB_MGMT_BASE_VERSION
;
596 set_bit(IB_MGMT_METHOD_GET
, reg_req
.method_mask
);
597 set_bit(IB_MGMT_METHOD_SET
, reg_req
.method_mask
);
599 sport
->mad_agent
= ib_register_mad_agent(sport
->sdev
->device
,
603 srpt_mad_send_handler
,
604 srpt_mad_recv_handler
,
606 if (IS_ERR(sport
->mad_agent
)) {
607 ret
= PTR_ERR(sport
->mad_agent
);
608 sport
->mad_agent
= NULL
;
617 port_modify
.set_port_cap_mask
= 0;
618 port_modify
.clr_port_cap_mask
= IB_PORT_DEVICE_MGMT_SUP
;
619 ib_modify_port(sport
->sdev
->device
, sport
->port
, 0, &port_modify
);
627 * srpt_unregister_mad_agent - unregister MAD callback functions
628 * @sdev: SRPT HCA pointer.
630 * Note: It is safe to call this function more than once for the same device.
632 static void srpt_unregister_mad_agent(struct srpt_device
*sdev
)
634 struct ib_port_modify port_modify
= {
635 .clr_port_cap_mask
= IB_PORT_DEVICE_MGMT_SUP
,
637 struct srpt_port
*sport
;
640 for (i
= 1; i
<= sdev
->device
->phys_port_cnt
; i
++) {
641 sport
= &sdev
->port
[i
- 1];
642 WARN_ON(sport
->port
!= i
);
643 if (ib_modify_port(sdev
->device
, i
, 0, &port_modify
) < 0)
644 pr_err("disabling MAD processing failed.\n");
645 if (sport
->mad_agent
) {
646 ib_unregister_mad_agent(sport
->mad_agent
);
647 sport
->mad_agent
= NULL
;
653 * srpt_alloc_ioctx - allocate a SRPT I/O context structure
654 * @sdev: SRPT HCA pointer.
655 * @ioctx_size: I/O context size.
656 * @dma_size: Size of I/O context DMA buffer.
657 * @dir: DMA data direction.
659 static struct srpt_ioctx
*srpt_alloc_ioctx(struct srpt_device
*sdev
,
660 int ioctx_size
, int dma_size
,
661 enum dma_data_direction dir
)
663 struct srpt_ioctx
*ioctx
;
665 ioctx
= kmalloc(ioctx_size
, GFP_KERNEL
);
669 ioctx
->buf
= kmalloc(dma_size
, GFP_KERNEL
);
673 ioctx
->dma
= ib_dma_map_single(sdev
->device
, ioctx
->buf
, dma_size
, dir
);
674 if (ib_dma_mapping_error(sdev
->device
, ioctx
->dma
))
688 * srpt_free_ioctx - free a SRPT I/O context structure
689 * @sdev: SRPT HCA pointer.
690 * @ioctx: I/O context pointer.
691 * @dma_size: Size of I/O context DMA buffer.
692 * @dir: DMA data direction.
694 static void srpt_free_ioctx(struct srpt_device
*sdev
, struct srpt_ioctx
*ioctx
,
695 int dma_size
, enum dma_data_direction dir
)
700 ib_dma_unmap_single(sdev
->device
, ioctx
->dma
, dma_size
, dir
);
706 * srpt_alloc_ioctx_ring - allocate a ring of SRPT I/O context structures
707 * @sdev: Device to allocate the I/O context ring for.
708 * @ring_size: Number of elements in the I/O context ring.
709 * @ioctx_size: I/O context size.
710 * @dma_size: DMA buffer size.
711 * @dir: DMA data direction.
713 static struct srpt_ioctx
**srpt_alloc_ioctx_ring(struct srpt_device
*sdev
,
714 int ring_size
, int ioctx_size
,
715 int dma_size
, enum dma_data_direction dir
)
717 struct srpt_ioctx
**ring
;
720 WARN_ON(ioctx_size
!= sizeof(struct srpt_recv_ioctx
)
721 && ioctx_size
!= sizeof(struct srpt_send_ioctx
));
723 ring
= kmalloc_array(ring_size
, sizeof(ring
[0]), GFP_KERNEL
);
726 for (i
= 0; i
< ring_size
; ++i
) {
727 ring
[i
] = srpt_alloc_ioctx(sdev
, ioctx_size
, dma_size
, dir
);
736 srpt_free_ioctx(sdev
, ring
[i
], dma_size
, dir
);
744 * srpt_free_ioctx_ring - free the ring of SRPT I/O context structures
745 * @ioctx_ring: I/O context ring to be freed.
746 * @sdev: SRPT HCA pointer.
747 * @ring_size: Number of ring elements.
748 * @dma_size: Size of I/O context DMA buffer.
749 * @dir: DMA data direction.
751 static void srpt_free_ioctx_ring(struct srpt_ioctx
**ioctx_ring
,
752 struct srpt_device
*sdev
, int ring_size
,
753 int dma_size
, enum dma_data_direction dir
)
760 for (i
= 0; i
< ring_size
; ++i
)
761 srpt_free_ioctx(sdev
, ioctx_ring
[i
], dma_size
, dir
);
766 * srpt_set_cmd_state - set the state of a SCSI command
767 * @ioctx: Send I/O context.
768 * @new: New I/O context state.
770 * Does not modify the state of aborted commands. Returns the previous command
773 static enum srpt_command_state
srpt_set_cmd_state(struct srpt_send_ioctx
*ioctx
,
774 enum srpt_command_state
new)
776 enum srpt_command_state previous
;
778 previous
= ioctx
->state
;
779 if (previous
!= SRPT_STATE_DONE
)
786 * srpt_test_and_set_cmd_state - test and set the state of a command
787 * @ioctx: Send I/O context.
788 * @old: Current I/O context state.
789 * @new: New I/O context state.
791 * Returns true if and only if the previous command state was equal to 'old'.
793 static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx
*ioctx
,
794 enum srpt_command_state old
,
795 enum srpt_command_state
new)
797 enum srpt_command_state previous
;
800 WARN_ON(old
== SRPT_STATE_DONE
);
801 WARN_ON(new == SRPT_STATE_NEW
);
803 previous
= ioctx
->state
;
807 return previous
== old
;
811 * srpt_post_recv - post an IB receive request
812 * @sdev: SRPT HCA pointer.
813 * @ch: SRPT RDMA channel.
814 * @ioctx: Receive I/O context pointer.
816 static int srpt_post_recv(struct srpt_device
*sdev
, struct srpt_rdma_ch
*ch
,
817 struct srpt_recv_ioctx
*ioctx
)
820 struct ib_recv_wr wr
, *bad_wr
;
823 list
.addr
= ioctx
->ioctx
.dma
;
824 list
.length
= srp_max_req_size
;
825 list
.lkey
= sdev
->lkey
;
827 ioctx
->ioctx
.cqe
.done
= srpt_recv_done
;
828 wr
.wr_cqe
= &ioctx
->ioctx
.cqe
;
834 return ib_post_srq_recv(sdev
->srq
, &wr
, &bad_wr
);
836 return ib_post_recv(ch
->qp
, &wr
, &bad_wr
);
840 * srpt_zerolength_write - perform a zero-length RDMA write
841 * @ch: SRPT RDMA channel.
843 * A quote from the InfiniBand specification: C9-88: For an HCA responder
844 * using Reliable Connection service, for each zero-length RDMA READ or WRITE
845 * request, the R_Key shall not be validated, even if the request includes
848 static int srpt_zerolength_write(struct srpt_rdma_ch
*ch
)
850 struct ib_send_wr
*bad_wr
;
851 struct ib_rdma_wr wr
= {
854 { .wr_cqe
= &ch
->zw_cqe
, },
855 .opcode
= IB_WR_RDMA_WRITE
,
856 .send_flags
= IB_SEND_SIGNALED
,
860 pr_debug("%s-%d: queued zerolength write\n", ch
->sess_name
,
863 return ib_post_send(ch
->qp
, &wr
.wr
, &bad_wr
);
866 static void srpt_zerolength_write_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
868 struct srpt_rdma_ch
*ch
= cq
->cq_context
;
870 pr_debug("%s-%d wc->status %d\n", ch
->sess_name
, ch
->qp
->qp_num
,
873 if (wc
->status
== IB_WC_SUCCESS
) {
874 srpt_process_wait_list(ch
);
876 if (srpt_set_ch_state(ch
, CH_DISCONNECTED
))
877 schedule_work(&ch
->release_work
);
879 pr_debug("%s-%d: already disconnected.\n",
880 ch
->sess_name
, ch
->qp
->qp_num
);
884 static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx
*ioctx
,
885 struct srp_direct_buf
*db
, int nbufs
, struct scatterlist
**sg
,
888 enum dma_data_direction dir
= target_reverse_dma_direction(&ioctx
->cmd
);
889 struct srpt_rdma_ch
*ch
= ioctx
->ch
;
890 struct scatterlist
*prev
= NULL
;
895 ioctx
->rw_ctxs
= &ioctx
->s_rw_ctx
;
897 ioctx
->rw_ctxs
= kmalloc_array(nbufs
, sizeof(*ioctx
->rw_ctxs
),
903 for (i
= ioctx
->n_rw_ctx
; i
< nbufs
; i
++, db
++) {
904 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
905 u64 remote_addr
= be64_to_cpu(db
->va
);
906 u32 size
= be32_to_cpu(db
->len
);
907 u32 rkey
= be32_to_cpu(db
->key
);
909 ret
= target_alloc_sgl(&ctx
->sg
, &ctx
->nents
, size
, false,
914 ret
= rdma_rw_ctx_init(&ctx
->rw
, ch
->qp
, ch
->sport
->port
,
915 ctx
->sg
, ctx
->nents
, 0, remote_addr
, rkey
, dir
);
917 target_free_sgl(ctx
->sg
, ctx
->nents
);
921 ioctx
->n_rdma
+= ret
;
925 sg_unmark_end(&prev
[prev_nents
- 1]);
926 sg_chain(prev
, prev_nents
+ 1, ctx
->sg
);
932 prev_nents
= ctx
->nents
;
934 *sg_cnt
+= ctx
->nents
;
941 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
943 rdma_rw_ctx_destroy(&ctx
->rw
, ch
->qp
, ch
->sport
->port
,
944 ctx
->sg
, ctx
->nents
, dir
);
945 target_free_sgl(ctx
->sg
, ctx
->nents
);
947 if (ioctx
->rw_ctxs
!= &ioctx
->s_rw_ctx
)
948 kfree(ioctx
->rw_ctxs
);
952 static void srpt_free_rw_ctxs(struct srpt_rdma_ch
*ch
,
953 struct srpt_send_ioctx
*ioctx
)
955 enum dma_data_direction dir
= target_reverse_dma_direction(&ioctx
->cmd
);
958 for (i
= 0; i
< ioctx
->n_rw_ctx
; i
++) {
959 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
961 rdma_rw_ctx_destroy(&ctx
->rw
, ch
->qp
, ch
->sport
->port
,
962 ctx
->sg
, ctx
->nents
, dir
);
963 target_free_sgl(ctx
->sg
, ctx
->nents
);
966 if (ioctx
->rw_ctxs
!= &ioctx
->s_rw_ctx
)
967 kfree(ioctx
->rw_ctxs
);
970 static inline void *srpt_get_desc_buf(struct srp_cmd
*srp_cmd
)
973 * The pointer computations below will only be compiled correctly
974 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
975 * whether srp_cmd::add_data has been declared as a byte pointer.
977 BUILD_BUG_ON(!__same_type(srp_cmd
->add_data
[0], (s8
)0) &&
978 !__same_type(srp_cmd
->add_data
[0], (u8
)0));
981 * According to the SRP spec, the lower two bits of the 'ADDITIONAL
982 * CDB LENGTH' field are reserved and the size in bytes of this field
983 * is four times the value specified in bits 3..7. Hence the "& ~3".
985 return srp_cmd
->add_data
+ (srp_cmd
->add_cdb_len
& ~3);
989 * srpt_get_desc_tbl - parse the data descriptors of a SRP_CMD request
990 * @ioctx: Pointer to the I/O context associated with the request.
991 * @srp_cmd: Pointer to the SRP_CMD request data.
992 * @dir: Pointer to the variable to which the transfer direction will be
994 * @sg: [out] scatterlist allocated for the parsed SRP_CMD.
995 * @sg_cnt: [out] length of @sg.
996 * @data_len: Pointer to the variable to which the total data length of all
997 * descriptors in the SRP_CMD request will be written.
999 * This function initializes ioctx->nrbuf and ioctx->r_bufs.
1001 * Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
1002 * -ENOMEM when memory allocation fails and zero upon success.
1004 static int srpt_get_desc_tbl(struct srpt_send_ioctx
*ioctx
,
1005 struct srp_cmd
*srp_cmd
, enum dma_data_direction
*dir
,
1006 struct scatterlist
**sg
, unsigned *sg_cnt
, u64
*data_len
)
1012 * The lower four bits of the buffer format field contain the DATA-IN
1013 * buffer descriptor format, and the highest four bits contain the
1014 * DATA-OUT buffer descriptor format.
1016 if (srp_cmd
->buf_fmt
& 0xf)
1017 /* DATA-IN: transfer data from target to initiator (read). */
1018 *dir
= DMA_FROM_DEVICE
;
1019 else if (srp_cmd
->buf_fmt
>> 4)
1020 /* DATA-OUT: transfer data from initiator to target (write). */
1021 *dir
= DMA_TO_DEVICE
;
1025 /* initialize data_direction early as srpt_alloc_rw_ctxs needs it */
1026 ioctx
->cmd
.data_direction
= *dir
;
1028 if (((srp_cmd
->buf_fmt
& 0xf) == SRP_DATA_DESC_DIRECT
) ||
1029 ((srp_cmd
->buf_fmt
>> 4) == SRP_DATA_DESC_DIRECT
)) {
1030 struct srp_direct_buf
*db
= srpt_get_desc_buf(srp_cmd
);
1032 *data_len
= be32_to_cpu(db
->len
);
1033 return srpt_alloc_rw_ctxs(ioctx
, db
, 1, sg
, sg_cnt
);
1034 } else if (((srp_cmd
->buf_fmt
& 0xf) == SRP_DATA_DESC_INDIRECT
) ||
1035 ((srp_cmd
->buf_fmt
>> 4) == SRP_DATA_DESC_INDIRECT
)) {
1036 struct srp_indirect_buf
*idb
= srpt_get_desc_buf(srp_cmd
);
1037 int nbufs
= be32_to_cpu(idb
->table_desc
.len
) /
1038 sizeof(struct srp_direct_buf
);
1041 (srp_cmd
->data_out_desc_cnt
+ srp_cmd
->data_in_desc_cnt
)) {
1042 pr_err("received unsupported SRP_CMD request"
1043 " type (%u out + %u in != %u / %zu)\n",
1044 srp_cmd
->data_out_desc_cnt
,
1045 srp_cmd
->data_in_desc_cnt
,
1046 be32_to_cpu(idb
->table_desc
.len
),
1047 sizeof(struct srp_direct_buf
));
1051 *data_len
= be32_to_cpu(idb
->len
);
1052 return srpt_alloc_rw_ctxs(ioctx
, idb
->desc_list
, nbufs
,
1061 * srpt_init_ch_qp - initialize queue pair attributes
1062 * @ch: SRPT RDMA channel.
1063 * @qp: Queue pair pointer.
1065 * Initialized the attributes of queue pair 'qp' by allowing local write,
1066 * remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
1068 static int srpt_init_ch_qp(struct srpt_rdma_ch
*ch
, struct ib_qp
*qp
)
1070 struct ib_qp_attr
*attr
;
1073 WARN_ON_ONCE(ch
->using_rdma_cm
);
1075 attr
= kzalloc(sizeof(*attr
), GFP_KERNEL
);
1079 attr
->qp_state
= IB_QPS_INIT
;
1080 attr
->qp_access_flags
= IB_ACCESS_LOCAL_WRITE
;
1081 attr
->port_num
= ch
->sport
->port
;
1083 ret
= ib_find_cached_pkey(ch
->sport
->sdev
->device
, ch
->sport
->port
,
1084 ch
->pkey
, &attr
->pkey_index
);
1086 pr_err("Translating pkey %#x failed (%d) - using index 0\n",
1089 ret
= ib_modify_qp(qp
, attr
,
1090 IB_QP_STATE
| IB_QP_ACCESS_FLAGS
| IB_QP_PORT
|
1098 * srpt_ch_qp_rtr - change the state of a channel to 'ready to receive' (RTR)
1099 * @ch: channel of the queue pair.
1100 * @qp: queue pair to change the state of.
1102 * Returns zero upon success and a negative value upon failure.
1104 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1105 * If this structure ever becomes larger, it might be necessary to allocate
1106 * it dynamically instead of on the stack.
1108 static int srpt_ch_qp_rtr(struct srpt_rdma_ch
*ch
, struct ib_qp
*qp
)
1110 struct ib_qp_attr qp_attr
;
1114 WARN_ON_ONCE(ch
->using_rdma_cm
);
1116 qp_attr
.qp_state
= IB_QPS_RTR
;
1117 ret
= ib_cm_init_qp_attr(ch
->ib_cm
.cm_id
, &qp_attr
, &attr_mask
);
1121 qp_attr
.max_dest_rd_atomic
= 4;
1123 ret
= ib_modify_qp(qp
, &qp_attr
, attr_mask
);
1130 * srpt_ch_qp_rts - change the state of a channel to 'ready to send' (RTS)
1131 * @ch: channel of the queue pair.
1132 * @qp: queue pair to change the state of.
1134 * Returns zero upon success and a negative value upon failure.
1136 * Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
1137 * If this structure ever becomes larger, it might be necessary to allocate
1138 * it dynamically instead of on the stack.
1140 static int srpt_ch_qp_rts(struct srpt_rdma_ch
*ch
, struct ib_qp
*qp
)
1142 struct ib_qp_attr qp_attr
;
1146 qp_attr
.qp_state
= IB_QPS_RTS
;
1147 ret
= ib_cm_init_qp_attr(ch
->ib_cm
.cm_id
, &qp_attr
, &attr_mask
);
1151 qp_attr
.max_rd_atomic
= 4;
1153 ret
= ib_modify_qp(qp
, &qp_attr
, attr_mask
);
1160 * srpt_ch_qp_err - set the channel queue pair state to 'error'
1161 * @ch: SRPT RDMA channel.
1163 static int srpt_ch_qp_err(struct srpt_rdma_ch
*ch
)
1165 struct ib_qp_attr qp_attr
;
1167 qp_attr
.qp_state
= IB_QPS_ERR
;
1168 return ib_modify_qp(ch
->qp
, &qp_attr
, IB_QP_STATE
);
1172 * srpt_get_send_ioctx - obtain an I/O context for sending to the initiator
1173 * @ch: SRPT RDMA channel.
1175 static struct srpt_send_ioctx
*srpt_get_send_ioctx(struct srpt_rdma_ch
*ch
)
1177 struct srpt_send_ioctx
*ioctx
;
1178 unsigned long flags
;
1183 spin_lock_irqsave(&ch
->spinlock
, flags
);
1184 if (!list_empty(&ch
->free_list
)) {
1185 ioctx
= list_first_entry(&ch
->free_list
,
1186 struct srpt_send_ioctx
, free_list
);
1187 list_del(&ioctx
->free_list
);
1189 spin_unlock_irqrestore(&ch
->spinlock
, flags
);
1194 BUG_ON(ioctx
->ch
!= ch
);
1195 ioctx
->state
= SRPT_STATE_NEW
;
1197 ioctx
->n_rw_ctx
= 0;
1198 ioctx
->queue_status_only
= false;
1200 * transport_init_se_cmd() does not initialize all fields, so do it
1203 memset(&ioctx
->cmd
, 0, sizeof(ioctx
->cmd
));
1204 memset(&ioctx
->sense_data
, 0, sizeof(ioctx
->sense_data
));
1210 * srpt_abort_cmd - abort a SCSI command
1211 * @ioctx: I/O context associated with the SCSI command.
1213 static int srpt_abort_cmd(struct srpt_send_ioctx
*ioctx
)
1215 enum srpt_command_state state
;
1220 * If the command is in a state where the target core is waiting for
1221 * the ib_srpt driver, change the state to the next state.
1224 state
= ioctx
->state
;
1226 case SRPT_STATE_NEED_DATA
:
1227 ioctx
->state
= SRPT_STATE_DATA_IN
;
1229 case SRPT_STATE_CMD_RSP_SENT
:
1230 case SRPT_STATE_MGMT_RSP_SENT
:
1231 ioctx
->state
= SRPT_STATE_DONE
;
1234 WARN_ONCE(true, "%s: unexpected I/O context state %d\n",
1239 pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state
,
1240 ioctx
->state
, ioctx
->cmd
.tag
);
1243 case SRPT_STATE_NEW
:
1244 case SRPT_STATE_DATA_IN
:
1245 case SRPT_STATE_MGMT
:
1246 case SRPT_STATE_DONE
:
1248 * Do nothing - defer abort processing until
1249 * srpt_queue_response() is invoked.
1252 case SRPT_STATE_NEED_DATA
:
1253 pr_debug("tag %#llx: RDMA read error\n", ioctx
->cmd
.tag
);
1254 transport_generic_request_failure(&ioctx
->cmd
,
1255 TCM_CHECK_CONDITION_ABORT_CMD
);
1257 case SRPT_STATE_CMD_RSP_SENT
:
1259 * SRP_RSP sending failed or the SRP_RSP send completion has
1260 * not been received in time.
1262 transport_generic_free_cmd(&ioctx
->cmd
, 0);
1264 case SRPT_STATE_MGMT_RSP_SENT
:
1265 transport_generic_free_cmd(&ioctx
->cmd
, 0);
1268 WARN(1, "Unexpected command state (%d)", state
);
1276 * srpt_rdma_read_done - RDMA read completion callback
1277 * @cq: Completion queue.
1278 * @wc: Work completion.
1280 * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
1281 * the data that has been transferred via IB RDMA had to be postponed until the
1282 * check_stop_free() callback. None of this is necessary anymore and needs to
1285 static void srpt_rdma_read_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1287 struct srpt_rdma_ch
*ch
= cq
->cq_context
;
1288 struct srpt_send_ioctx
*ioctx
=
1289 container_of(wc
->wr_cqe
, struct srpt_send_ioctx
, rdma_cqe
);
1291 WARN_ON(ioctx
->n_rdma
<= 0);
1292 atomic_add(ioctx
->n_rdma
, &ch
->sq_wr_avail
);
1295 if (unlikely(wc
->status
!= IB_WC_SUCCESS
)) {
1296 pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",
1298 srpt_abort_cmd(ioctx
);
1302 if (srpt_test_and_set_cmd_state(ioctx
, SRPT_STATE_NEED_DATA
,
1303 SRPT_STATE_DATA_IN
))
1304 target_execute_cmd(&ioctx
->cmd
);
1306 pr_err("%s[%d]: wrong state = %d\n", __func__
,
1307 __LINE__
, ioctx
->state
);
1311 * srpt_build_cmd_rsp - build a SRP_RSP response
1312 * @ch: RDMA channel through which the request has been received.
1313 * @ioctx: I/O context associated with the SRP_CMD request. The response will
1314 * be built in the buffer ioctx->buf points at and hence this function will
1315 * overwrite the request data.
1316 * @tag: tag of the request for which this response is being generated.
1317 * @status: value for the STATUS field of the SRP_RSP information unit.
1319 * Returns the size in bytes of the SRP_RSP response.
1321 * An SRP_RSP response contains a SCSI status or service response. See also
1322 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1323 * response. See also SPC-2 for more information about sense data.
1325 static int srpt_build_cmd_rsp(struct srpt_rdma_ch
*ch
,
1326 struct srpt_send_ioctx
*ioctx
, u64 tag
,
1329 struct srp_rsp
*srp_rsp
;
1330 const u8
*sense_data
;
1331 int sense_data_len
, max_sense_len
;
1334 * The lowest bit of all SAM-3 status codes is zero (see also
1335 * paragraph 5.3 in SAM-3).
1337 WARN_ON(status
& 1);
1339 srp_rsp
= ioctx
->ioctx
.buf
;
1342 sense_data
= ioctx
->sense_data
;
1343 sense_data_len
= ioctx
->cmd
.scsi_sense_length
;
1344 WARN_ON(sense_data_len
> sizeof(ioctx
->sense_data
));
1346 memset(srp_rsp
, 0, sizeof(*srp_rsp
));
1347 srp_rsp
->opcode
= SRP_RSP
;
1348 srp_rsp
->req_lim_delta
=
1349 cpu_to_be32(1 + atomic_xchg(&ch
->req_lim_delta
, 0));
1351 srp_rsp
->status
= status
;
1353 if (sense_data_len
) {
1354 BUILD_BUG_ON(MIN_MAX_RSP_SIZE
<= sizeof(*srp_rsp
));
1355 max_sense_len
= ch
->max_ti_iu_len
- sizeof(*srp_rsp
);
1356 if (sense_data_len
> max_sense_len
) {
1357 pr_warn("truncated sense data from %d to %d"
1358 " bytes\n", sense_data_len
, max_sense_len
);
1359 sense_data_len
= max_sense_len
;
1362 srp_rsp
->flags
|= SRP_RSP_FLAG_SNSVALID
;
1363 srp_rsp
->sense_data_len
= cpu_to_be32(sense_data_len
);
1364 memcpy(srp_rsp
+ 1, sense_data
, sense_data_len
);
1367 return sizeof(*srp_rsp
) + sense_data_len
;
1371 * srpt_build_tskmgmt_rsp - build a task management response
1372 * @ch: RDMA channel through which the request has been received.
1373 * @ioctx: I/O context in which the SRP_RSP response will be built.
1374 * @rsp_code: RSP_CODE that will be stored in the response.
1375 * @tag: Tag of the request for which this response is being generated.
1377 * Returns the size in bytes of the SRP_RSP response.
1379 * An SRP_RSP response contains a SCSI status or service response. See also
1380 * section 6.9 in the SRP r16a document for the format of an SRP_RSP
1383 static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch
*ch
,
1384 struct srpt_send_ioctx
*ioctx
,
1385 u8 rsp_code
, u64 tag
)
1387 struct srp_rsp
*srp_rsp
;
1392 resp_len
= sizeof(*srp_rsp
) + resp_data_len
;
1394 srp_rsp
= ioctx
->ioctx
.buf
;
1396 memset(srp_rsp
, 0, sizeof(*srp_rsp
));
1398 srp_rsp
->opcode
= SRP_RSP
;
1399 srp_rsp
->req_lim_delta
=
1400 cpu_to_be32(1 + atomic_xchg(&ch
->req_lim_delta
, 0));
1403 srp_rsp
->flags
|= SRP_RSP_FLAG_RSPVALID
;
1404 srp_rsp
->resp_data_len
= cpu_to_be32(resp_data_len
);
1405 srp_rsp
->data
[3] = rsp_code
;
1410 static int srpt_check_stop_free(struct se_cmd
*cmd
)
1412 struct srpt_send_ioctx
*ioctx
= container_of(cmd
,
1413 struct srpt_send_ioctx
, cmd
);
1415 return target_put_sess_cmd(&ioctx
->cmd
);
1419 * srpt_handle_cmd - process a SRP_CMD information unit
1420 * @ch: SRPT RDMA channel.
1421 * @recv_ioctx: Receive I/O context.
1422 * @send_ioctx: Send I/O context.
1424 static void srpt_handle_cmd(struct srpt_rdma_ch
*ch
,
1425 struct srpt_recv_ioctx
*recv_ioctx
,
1426 struct srpt_send_ioctx
*send_ioctx
)
1429 struct srp_cmd
*srp_cmd
;
1430 struct scatterlist
*sg
= NULL
;
1431 unsigned sg_cnt
= 0;
1433 enum dma_data_direction dir
;
1436 BUG_ON(!send_ioctx
);
1438 srp_cmd
= recv_ioctx
->ioctx
.buf
;
1439 cmd
= &send_ioctx
->cmd
;
1440 cmd
->tag
= srp_cmd
->tag
;
1442 switch (srp_cmd
->task_attr
) {
1443 case SRP_CMD_SIMPLE_Q
:
1444 cmd
->sam_task_attr
= TCM_SIMPLE_TAG
;
1446 case SRP_CMD_ORDERED_Q
:
1448 cmd
->sam_task_attr
= TCM_ORDERED_TAG
;
1450 case SRP_CMD_HEAD_OF_Q
:
1451 cmd
->sam_task_attr
= TCM_HEAD_TAG
;
1454 cmd
->sam_task_attr
= TCM_ACA_TAG
;
1458 rc
= srpt_get_desc_tbl(send_ioctx
, srp_cmd
, &dir
, &sg
, &sg_cnt
,
1461 if (rc
!= -EAGAIN
) {
1462 pr_err("0x%llx: parsing SRP descriptor table failed.\n",
1468 rc
= target_submit_cmd_map_sgls(cmd
, ch
->sess
, srp_cmd
->cdb
,
1469 &send_ioctx
->sense_data
[0],
1470 scsilun_to_int(&srp_cmd
->lun
), data_len
,
1471 TCM_SIMPLE_TAG
, dir
, TARGET_SCF_ACK_KREF
,
1472 sg
, sg_cnt
, NULL
, 0, NULL
, 0);
1474 pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc
,
1481 send_ioctx
->state
= SRPT_STATE_DONE
;
1482 srpt_release_cmd(cmd
);
1485 static int srp_tmr_to_tcm(int fn
)
1488 case SRP_TSK_ABORT_TASK
:
1489 return TMR_ABORT_TASK
;
1490 case SRP_TSK_ABORT_TASK_SET
:
1491 return TMR_ABORT_TASK_SET
;
1492 case SRP_TSK_CLEAR_TASK_SET
:
1493 return TMR_CLEAR_TASK_SET
;
1494 case SRP_TSK_LUN_RESET
:
1495 return TMR_LUN_RESET
;
1496 case SRP_TSK_CLEAR_ACA
:
1497 return TMR_CLEAR_ACA
;
1504 * srpt_handle_tsk_mgmt - process a SRP_TSK_MGMT information unit
1505 * @ch: SRPT RDMA channel.
1506 * @recv_ioctx: Receive I/O context.
1507 * @send_ioctx: Send I/O context.
1509 * Returns 0 if and only if the request will be processed by the target core.
1511 * For more information about SRP_TSK_MGMT information units, see also section
1512 * 6.7 in the SRP r16a document.
1514 static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch
*ch
,
1515 struct srpt_recv_ioctx
*recv_ioctx
,
1516 struct srpt_send_ioctx
*send_ioctx
)
1518 struct srp_tsk_mgmt
*srp_tsk
;
1520 struct se_session
*sess
= ch
->sess
;
1524 BUG_ON(!send_ioctx
);
1526 srp_tsk
= recv_ioctx
->ioctx
.buf
;
1527 cmd
= &send_ioctx
->cmd
;
1529 pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld ch %p sess %p\n",
1530 srp_tsk
->tsk_mgmt_func
, srp_tsk
->task_tag
, srp_tsk
->tag
, ch
,
1533 srpt_set_cmd_state(send_ioctx
, SRPT_STATE_MGMT
);
1534 send_ioctx
->cmd
.tag
= srp_tsk
->tag
;
1535 tcm_tmr
= srp_tmr_to_tcm(srp_tsk
->tsk_mgmt_func
);
1536 rc
= target_submit_tmr(&send_ioctx
->cmd
, sess
, NULL
,
1537 scsilun_to_int(&srp_tsk
->lun
), srp_tsk
, tcm_tmr
,
1538 GFP_KERNEL
, srp_tsk
->task_tag
,
1539 TARGET_SCF_ACK_KREF
);
1541 send_ioctx
->cmd
.se_tmr_req
->response
= TMR_FUNCTION_REJECTED
;
1546 transport_send_check_condition_and_sense(cmd
, 0, 0); // XXX:
1550 * srpt_handle_new_iu - process a newly received information unit
1551 * @ch: RDMA channel through which the information unit has been received.
1552 * @recv_ioctx: Receive I/O context associated with the information unit.
1555 srpt_handle_new_iu(struct srpt_rdma_ch
*ch
, struct srpt_recv_ioctx
*recv_ioctx
)
1557 struct srpt_send_ioctx
*send_ioctx
= NULL
;
1558 struct srp_cmd
*srp_cmd
;
1563 BUG_ON(!recv_ioctx
);
1565 if (unlikely(ch
->state
== CH_CONNECTING
))
1568 ib_dma_sync_single_for_cpu(ch
->sport
->sdev
->device
,
1569 recv_ioctx
->ioctx
.dma
, srp_max_req_size
,
1572 srp_cmd
= recv_ioctx
->ioctx
.buf
;
1573 opcode
= srp_cmd
->opcode
;
1574 if (opcode
== SRP_CMD
|| opcode
== SRP_TSK_MGMT
) {
1575 send_ioctx
= srpt_get_send_ioctx(ch
);
1576 if (unlikely(!send_ioctx
))
1580 if (!list_empty(&recv_ioctx
->wait_list
)) {
1581 WARN_ON_ONCE(!ch
->processing_wait_list
);
1582 list_del_init(&recv_ioctx
->wait_list
);
1587 srpt_handle_cmd(ch
, recv_ioctx
, send_ioctx
);
1590 srpt_handle_tsk_mgmt(ch
, recv_ioctx
, send_ioctx
);
1593 pr_err("Not yet implemented: SRP_I_LOGOUT\n");
1596 pr_debug("received SRP_CRED_RSP\n");
1599 pr_debug("received SRP_AER_RSP\n");
1602 pr_err("Received SRP_RSP\n");
1605 pr_err("received IU with unknown opcode 0x%x\n", opcode
);
1609 srpt_post_recv(ch
->sport
->sdev
, ch
, recv_ioctx
);
1616 if (list_empty(&recv_ioctx
->wait_list
)) {
1617 WARN_ON_ONCE(ch
->processing_wait_list
);
1618 list_add_tail(&recv_ioctx
->wait_list
, &ch
->cmd_wait_list
);
1623 static void srpt_recv_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1625 struct srpt_rdma_ch
*ch
= cq
->cq_context
;
1626 struct srpt_recv_ioctx
*ioctx
=
1627 container_of(wc
->wr_cqe
, struct srpt_recv_ioctx
, ioctx
.cqe
);
1629 if (wc
->status
== IB_WC_SUCCESS
) {
1632 req_lim
= atomic_dec_return(&ch
->req_lim
);
1633 if (unlikely(req_lim
< 0))
1634 pr_err("req_lim = %d < 0\n", req_lim
);
1635 srpt_handle_new_iu(ch
, ioctx
);
1637 pr_info_ratelimited("receiving failed for ioctx %p with status %d\n",
1643 * This function must be called from the context in which RDMA completions are
1644 * processed because it accesses the wait list without protection against
1645 * access from other threads.
1647 static void srpt_process_wait_list(struct srpt_rdma_ch
*ch
)
1649 struct srpt_recv_ioctx
*recv_ioctx
, *tmp
;
1651 WARN_ON_ONCE(ch
->state
== CH_CONNECTING
);
1653 if (list_empty(&ch
->cmd_wait_list
))
1656 WARN_ON_ONCE(ch
->processing_wait_list
);
1657 ch
->processing_wait_list
= true;
1658 list_for_each_entry_safe(recv_ioctx
, tmp
, &ch
->cmd_wait_list
,
1660 if (!srpt_handle_new_iu(ch
, recv_ioctx
))
1663 ch
->processing_wait_list
= false;
1667 * srpt_send_done - send completion callback
1668 * @cq: Completion queue.
1669 * @wc: Work completion.
1671 * Note: Although this has not yet been observed during tests, at least in
1672 * theory it is possible that the srpt_get_send_ioctx() call invoked by
1673 * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
1674 * value in each response is set to one, and it is possible that this response
1675 * makes the initiator send a new request before the send completion for that
1676 * response has been processed. This could e.g. happen if the call to
1677 * srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
1678 * if IB retransmission causes generation of the send completion to be
1679 * delayed. Incoming information units for which srpt_get_send_ioctx() fails
1680 * are queued on cmd_wait_list. The code below processes these delayed
1681 * requests one at a time.
1683 static void srpt_send_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1685 struct srpt_rdma_ch
*ch
= cq
->cq_context
;
1686 struct srpt_send_ioctx
*ioctx
=
1687 container_of(wc
->wr_cqe
, struct srpt_send_ioctx
, ioctx
.cqe
);
1688 enum srpt_command_state state
;
1690 state
= srpt_set_cmd_state(ioctx
, SRPT_STATE_DONE
);
1692 WARN_ON(state
!= SRPT_STATE_CMD_RSP_SENT
&&
1693 state
!= SRPT_STATE_MGMT_RSP_SENT
);
1695 atomic_add(1 + ioctx
->n_rdma
, &ch
->sq_wr_avail
);
1697 if (wc
->status
!= IB_WC_SUCCESS
)
1698 pr_info("sending response for ioctx 0x%p failed"
1699 " with status %d\n", ioctx
, wc
->status
);
1701 if (state
!= SRPT_STATE_DONE
) {
1702 transport_generic_free_cmd(&ioctx
->cmd
, 0);
1704 pr_err("IB completion has been received too late for"
1705 " wr_id = %u.\n", ioctx
->ioctx
.index
);
1708 srpt_process_wait_list(ch
);
1712 * srpt_create_ch_ib - create receive and send completion queues
1713 * @ch: SRPT RDMA channel.
1715 static int srpt_create_ch_ib(struct srpt_rdma_ch
*ch
)
1717 struct ib_qp_init_attr
*qp_init
;
1718 struct srpt_port
*sport
= ch
->sport
;
1719 struct srpt_device
*sdev
= sport
->sdev
;
1720 const struct ib_device_attr
*attrs
= &sdev
->device
->attrs
;
1721 int sq_size
= sport
->port_attrib
.srp_sq_size
;
1724 WARN_ON(ch
->rq_size
< 1);
1727 qp_init
= kzalloc(sizeof(*qp_init
), GFP_KERNEL
);
1732 ch
->cq
= ib_alloc_cq(sdev
->device
, ch
, ch
->rq_size
+ sq_size
,
1733 0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE
);
1734 if (IS_ERR(ch
->cq
)) {
1735 ret
= PTR_ERR(ch
->cq
);
1736 pr_err("failed to create CQ cqe= %d ret= %d\n",
1737 ch
->rq_size
+ sq_size
, ret
);
1741 qp_init
->qp_context
= (void *)ch
;
1742 qp_init
->event_handler
1743 = (void(*)(struct ib_event
*, void*))srpt_qp_event
;
1744 qp_init
->send_cq
= ch
->cq
;
1745 qp_init
->recv_cq
= ch
->cq
;
1746 qp_init
->sq_sig_type
= IB_SIGNAL_REQ_WR
;
1747 qp_init
->qp_type
= IB_QPT_RC
;
1749 * We divide up our send queue size into half SEND WRs to send the
1750 * completions, and half R/W contexts to actually do the RDMA
1751 * READ/WRITE transfers. Note that we need to allocate CQ slots for
1752 * both both, as RDMA contexts will also post completions for the
1755 qp_init
->cap
.max_send_wr
= min(sq_size
/ 2, attrs
->max_qp_wr
);
1756 qp_init
->cap
.max_rdma_ctxs
= sq_size
/ 2;
1757 qp_init
->cap
.max_send_sge
= min(attrs
->max_sge
, SRPT_MAX_SG_PER_WQE
);
1758 qp_init
->port_num
= ch
->sport
->port
;
1759 if (sdev
->use_srq
) {
1760 qp_init
->srq
= sdev
->srq
;
1762 qp_init
->cap
.max_recv_wr
= ch
->rq_size
;
1763 qp_init
->cap
.max_recv_sge
= qp_init
->cap
.max_send_sge
;
1766 if (ch
->using_rdma_cm
) {
1767 ret
= rdma_create_qp(ch
->rdma_cm
.cm_id
, sdev
->pd
, qp_init
);
1768 ch
->qp
= ch
->rdma_cm
.cm_id
->qp
;
1770 ch
->qp
= ib_create_qp(sdev
->pd
, qp_init
);
1771 if (!IS_ERR(ch
->qp
)) {
1772 ret
= srpt_init_ch_qp(ch
, ch
->qp
);
1774 ib_destroy_qp(ch
->qp
);
1776 ret
= PTR_ERR(ch
->qp
);
1780 bool retry
= sq_size
> MIN_SRPT_SQ_SIZE
;
1783 pr_debug("failed to create queue pair with sq_size = %d (%d) - retrying\n",
1786 sq_size
= max(sq_size
/ 2, MIN_SRPT_SQ_SIZE
);
1789 pr_err("failed to create queue pair with sq_size = %d (%d)\n",
1791 goto err_destroy_cq
;
1795 atomic_set(&ch
->sq_wr_avail
, qp_init
->cap
.max_send_wr
);
1797 pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d ch= %p\n",
1798 __func__
, ch
->cq
->cqe
, qp_init
->cap
.max_send_sge
,
1799 qp_init
->cap
.max_send_wr
, ch
);
1802 for (i
= 0; i
< ch
->rq_size
; i
++)
1803 srpt_post_recv(sdev
, ch
, ch
->ioctx_recv_ring
[i
]);
1815 static void srpt_destroy_ch_ib(struct srpt_rdma_ch
*ch
)
1817 ib_destroy_qp(ch
->qp
);
1822 * srpt_close_ch - close a RDMA channel
1823 * @ch: SRPT RDMA channel.
1825 * Make sure all resources associated with the channel will be deallocated at
1826 * an appropriate time.
1828 * Returns true if and only if the channel state has been modified into
1831 static bool srpt_close_ch(struct srpt_rdma_ch
*ch
)
1835 if (!srpt_set_ch_state(ch
, CH_DRAINING
)) {
1836 pr_debug("%s-%d: already closed\n", ch
->sess_name
,
1841 kref_get(&ch
->kref
);
1843 ret
= srpt_ch_qp_err(ch
);
1845 pr_err("%s-%d: changing queue pair into error state failed: %d\n",
1846 ch
->sess_name
, ch
->qp
->qp_num
, ret
);
1848 ret
= srpt_zerolength_write(ch
);
1850 pr_err("%s-%d: queuing zero-length write failed: %d\n",
1851 ch
->sess_name
, ch
->qp
->qp_num
, ret
);
1852 if (srpt_set_ch_state(ch
, CH_DISCONNECTED
))
1853 schedule_work(&ch
->release_work
);
1858 kref_put(&ch
->kref
, srpt_free_ch
);
1864 * Change the channel state into CH_DISCONNECTING. If a channel has not yet
1865 * reached the connected state, close it. If a channel is in the connected
1866 * state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is
1867 * the responsibility of the caller to ensure that this function is not
1868 * invoked concurrently with the code that accepts a connection. This means
1869 * that this function must either be invoked from inside a CM callback
1870 * function or that it must be invoked with the srpt_port.mutex held.
1872 static int srpt_disconnect_ch(struct srpt_rdma_ch
*ch
)
1876 if (!srpt_set_ch_state(ch
, CH_DISCONNECTING
))
1879 if (ch
->using_rdma_cm
) {
1880 ret
= rdma_disconnect(ch
->rdma_cm
.cm_id
);
1882 ret
= ib_send_cm_dreq(ch
->ib_cm
.cm_id
, NULL
, 0);
1884 ret
= ib_send_cm_drep(ch
->ib_cm
.cm_id
, NULL
, 0);
1887 if (ret
< 0 && srpt_close_ch(ch
))
1893 static bool srpt_ch_closed(struct srpt_port
*sport
, struct srpt_rdma_ch
*ch
)
1895 struct srpt_nexus
*nexus
;
1896 struct srpt_rdma_ch
*ch2
;
1900 list_for_each_entry(nexus
, &sport
->nexus_list
, entry
) {
1901 list_for_each_entry(ch2
, &nexus
->ch_list
, list
) {
1914 /* Send DREQ and wait for DREP. */
1915 static void srpt_disconnect_ch_sync(struct srpt_rdma_ch
*ch
)
1917 struct srpt_port
*sport
= ch
->sport
;
1919 pr_debug("ch %s-%d state %d\n", ch
->sess_name
, ch
->qp
->qp_num
,
1922 mutex_lock(&sport
->mutex
);
1923 srpt_disconnect_ch(ch
);
1924 mutex_unlock(&sport
->mutex
);
1926 while (wait_event_timeout(sport
->ch_releaseQ
, srpt_ch_closed(sport
, ch
),
1928 pr_info("%s(%s-%d state %d): still waiting ...\n", __func__
,
1929 ch
->sess_name
, ch
->qp
->qp_num
, ch
->state
);
1933 static void __srpt_close_all_ch(struct srpt_port
*sport
)
1935 struct srpt_nexus
*nexus
;
1936 struct srpt_rdma_ch
*ch
;
1938 lockdep_assert_held(&sport
->mutex
);
1940 list_for_each_entry(nexus
, &sport
->nexus_list
, entry
) {
1941 list_for_each_entry(ch
, &nexus
->ch_list
, list
) {
1942 if (srpt_disconnect_ch(ch
) >= 0)
1943 pr_info("Closing channel %s-%d because target %s_%d has been disabled\n",
1944 ch
->sess_name
, ch
->qp
->qp_num
,
1945 sport
->sdev
->device
->name
, sport
->port
);
1952 * Look up (i_port_id, t_port_id) in sport->nexus_list. Create an entry if
1953 * it does not yet exist.
1955 static struct srpt_nexus
*srpt_get_nexus(struct srpt_port
*sport
,
1956 const u8 i_port_id
[16],
1957 const u8 t_port_id
[16])
1959 struct srpt_nexus
*nexus
= NULL
, *tmp_nexus
= NULL
, *n
;
1962 mutex_lock(&sport
->mutex
);
1963 list_for_each_entry(n
, &sport
->nexus_list
, entry
) {
1964 if (memcmp(n
->i_port_id
, i_port_id
, 16) == 0 &&
1965 memcmp(n
->t_port_id
, t_port_id
, 16) == 0) {
1970 if (!nexus
&& tmp_nexus
) {
1971 list_add_tail_rcu(&tmp_nexus
->entry
,
1972 &sport
->nexus_list
);
1973 swap(nexus
, tmp_nexus
);
1975 mutex_unlock(&sport
->mutex
);
1979 tmp_nexus
= kzalloc(sizeof(*nexus
), GFP_KERNEL
);
1981 nexus
= ERR_PTR(-ENOMEM
);
1984 INIT_LIST_HEAD(&tmp_nexus
->ch_list
);
1985 memcpy(tmp_nexus
->i_port_id
, i_port_id
, 16);
1986 memcpy(tmp_nexus
->t_port_id
, t_port_id
, 16);
1994 static void srpt_set_enabled(struct srpt_port
*sport
, bool enabled
)
1995 __must_hold(&sport
->mutex
)
1997 lockdep_assert_held(&sport
->mutex
);
1999 if (sport
->enabled
== enabled
)
2001 sport
->enabled
= enabled
;
2003 __srpt_close_all_ch(sport
);
2006 static void srpt_free_ch(struct kref
*kref
)
2008 struct srpt_rdma_ch
*ch
= container_of(kref
, struct srpt_rdma_ch
, kref
);
2013 static void srpt_release_channel_work(struct work_struct
*w
)
2015 struct srpt_rdma_ch
*ch
;
2016 struct srpt_device
*sdev
;
2017 struct srpt_port
*sport
;
2018 struct se_session
*se_sess
;
2020 ch
= container_of(w
, struct srpt_rdma_ch
, release_work
);
2021 pr_debug("%s-%d\n", ch
->sess_name
, ch
->qp
->qp_num
);
2023 sdev
= ch
->sport
->sdev
;
2029 target_sess_cmd_list_set_waiting(se_sess
);
2030 target_wait_for_sess_cmds(se_sess
);
2032 transport_deregister_session_configfs(se_sess
);
2033 transport_deregister_session(se_sess
);
2036 if (ch
->using_rdma_cm
)
2037 rdma_destroy_id(ch
->rdma_cm
.cm_id
);
2039 ib_destroy_cm_id(ch
->ib_cm
.cm_id
);
2041 srpt_destroy_ch_ib(ch
);
2043 srpt_free_ioctx_ring((struct srpt_ioctx
**)ch
->ioctx_ring
,
2044 ch
->sport
->sdev
, ch
->rq_size
,
2045 ch
->max_rsp_size
, DMA_TO_DEVICE
);
2047 srpt_free_ioctx_ring((struct srpt_ioctx
**)ch
->ioctx_recv_ring
,
2049 srp_max_req_size
, DMA_FROM_DEVICE
);
2052 mutex_lock(&sport
->mutex
);
2053 list_del_rcu(&ch
->list
);
2054 mutex_unlock(&sport
->mutex
);
2056 wake_up(&sport
->ch_releaseQ
);
2058 kref_put(&ch
->kref
, srpt_free_ch
);
2062 * srpt_cm_req_recv - process the event IB_CM_REQ_RECEIVED
2063 * @sdev: HCA through which the login request was received.
2064 * @ib_cm_id: IB/CM connection identifier in case of IB/CM.
2065 * @rdma_cm_id: RDMA/CM connection identifier in case of RDMA/CM.
2066 * @port_num: Port through which the REQ message was received.
2067 * @pkey: P_Key of the incoming connection.
2068 * @req: SRP login request.
2069 * @src_addr: GID (IB/CM) or IP address (RDMA/CM) of the port that submitted
2070 * the login request.
2072 * Ownership of the cm_id is transferred to the target session if this
2073 * function returns zero. Otherwise the caller remains the owner of cm_id.
2075 static int srpt_cm_req_recv(struct srpt_device
*const sdev
,
2076 struct ib_cm_id
*ib_cm_id
,
2077 struct rdma_cm_id
*rdma_cm_id
,
2078 u8 port_num
, __be16 pkey
,
2079 const struct srp_login_req
*req
,
2080 const char *src_addr
)
2082 struct srpt_port
*sport
= &sdev
->port
[port_num
- 1];
2083 struct srpt_nexus
*nexus
;
2084 struct srp_login_rsp
*rsp
= NULL
;
2085 struct srp_login_rej
*rej
= NULL
;
2087 struct rdma_conn_param rdma_cm
;
2088 struct ib_cm_rep_param ib_cm
;
2089 } *rep_param
= NULL
;
2090 struct srpt_rdma_ch
*ch
;
2095 WARN_ON_ONCE(irqs_disabled());
2097 if (WARN_ON(!sdev
|| !req
))
2100 it_iu_len
= be32_to_cpu(req
->req_it_iu_len
);
2102 pr_info("Received SRP_LOGIN_REQ with i_port_id %pI6, t_port_id %pI6 and it_iu_len %d on port %d (guid=%pI6); pkey %#04x\n",
2103 req
->initiator_port_id
, req
->target_port_id
, it_iu_len
,
2104 port_num
, &sport
->gid
, be16_to_cpu(pkey
));
2106 nexus
= srpt_get_nexus(sport
, req
->initiator_port_id
,
2107 req
->target_port_id
);
2108 if (IS_ERR(nexus
)) {
2109 ret
= PTR_ERR(nexus
);
2114 rsp
= kzalloc(sizeof(*rsp
), GFP_KERNEL
);
2115 rej
= kzalloc(sizeof(*rej
), GFP_KERNEL
);
2116 rep_param
= kzalloc(sizeof(*rep_param
), GFP_KERNEL
);
2117 if (!rsp
|| !rej
|| !rep_param
)
2121 if (it_iu_len
> srp_max_req_size
|| it_iu_len
< 64) {
2122 rej
->reason
= cpu_to_be32(
2123 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE
);
2124 pr_err("rejected SRP_LOGIN_REQ because its length (%d bytes) is out of range (%d .. %d)\n",
2125 it_iu_len
, 64, srp_max_req_size
);
2129 if (!sport
->enabled
) {
2130 rej
->reason
= cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
2131 pr_info("rejected SRP_LOGIN_REQ because target port %s_%d has not yet been enabled\n",
2132 sport
->sdev
->device
->name
, port_num
);
2136 if (*(__be64
*)req
->target_port_id
!= cpu_to_be64(srpt_service_guid
)
2137 || *(__be64
*)(req
->target_port_id
+ 8) !=
2138 cpu_to_be64(srpt_service_guid
)) {
2139 rej
->reason
= cpu_to_be32(
2140 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL
);
2141 pr_err("rejected SRP_LOGIN_REQ because it has an invalid target port identifier.\n");
2146 ch
= kzalloc(sizeof(*ch
), GFP_KERNEL
);
2148 rej
->reason
= cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
2149 pr_err("rejected SRP_LOGIN_REQ because out of memory.\n");
2153 kref_init(&ch
->kref
);
2154 ch
->pkey
= be16_to_cpu(pkey
);
2156 ch
->zw_cqe
.done
= srpt_zerolength_write_done
;
2157 INIT_WORK(&ch
->release_work
, srpt_release_channel_work
);
2160 ch
->ib_cm
.cm_id
= ib_cm_id
;
2161 ib_cm_id
->context
= ch
;
2163 ch
->using_rdma_cm
= true;
2164 ch
->rdma_cm
.cm_id
= rdma_cm_id
;
2165 rdma_cm_id
->context
= ch
;
2168 * ch->rq_size should be at least as large as the initiator queue
2169 * depth to avoid that the initiator driver has to report QUEUE_FULL
2170 * to the SCSI mid-layer.
2172 ch
->rq_size
= min(MAX_SRPT_RQ_SIZE
, sdev
->device
->attrs
.max_qp_wr
);
2173 spin_lock_init(&ch
->spinlock
);
2174 ch
->state
= CH_CONNECTING
;
2175 INIT_LIST_HEAD(&ch
->cmd_wait_list
);
2176 ch
->max_rsp_size
= ch
->sport
->port_attrib
.srp_max_rsp_size
;
2178 ch
->ioctx_ring
= (struct srpt_send_ioctx
**)
2179 srpt_alloc_ioctx_ring(ch
->sport
->sdev
, ch
->rq_size
,
2180 sizeof(*ch
->ioctx_ring
[0]),
2181 ch
->max_rsp_size
, DMA_TO_DEVICE
);
2182 if (!ch
->ioctx_ring
) {
2183 pr_err("rejected SRP_LOGIN_REQ because creating a new QP SQ ring failed.\n");
2184 rej
->reason
= cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
2188 INIT_LIST_HEAD(&ch
->free_list
);
2189 for (i
= 0; i
< ch
->rq_size
; i
++) {
2190 ch
->ioctx_ring
[i
]->ch
= ch
;
2191 list_add_tail(&ch
->ioctx_ring
[i
]->free_list
, &ch
->free_list
);
2193 if (!sdev
->use_srq
) {
2194 ch
->ioctx_recv_ring
= (struct srpt_recv_ioctx
**)
2195 srpt_alloc_ioctx_ring(ch
->sport
->sdev
, ch
->rq_size
,
2196 sizeof(*ch
->ioctx_recv_ring
[0]),
2199 if (!ch
->ioctx_recv_ring
) {
2200 pr_err("rejected SRP_LOGIN_REQ because creating a new QP RQ ring failed.\n");
2202 cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
2205 for (i
= 0; i
< ch
->rq_size
; i
++)
2206 INIT_LIST_HEAD(&ch
->ioctx_recv_ring
[i
]->wait_list
);
2209 ret
= srpt_create_ch_ib(ch
);
2211 rej
->reason
= cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
2212 pr_err("rejected SRP_LOGIN_REQ because creating a new RDMA channel failed.\n");
2213 goto free_recv_ring
;
2216 strlcpy(ch
->sess_name
, src_addr
, sizeof(ch
->sess_name
));
2217 snprintf(i_port_id
, sizeof(i_port_id
), "0x%016llx%016llx",
2218 be64_to_cpu(*(__be64
*)nexus
->i_port_id
),
2219 be64_to_cpu(*(__be64
*)(nexus
->i_port_id
+ 8)));
2221 pr_debug("registering session %s\n", ch
->sess_name
);
2223 if (sport
->port_guid_tpg
.se_tpg_wwn
)
2224 ch
->sess
= target_alloc_session(&sport
->port_guid_tpg
, 0, 0,
2226 ch
->sess_name
, ch
, NULL
);
2227 if (sport
->port_gid_tpg
.se_tpg_wwn
&& IS_ERR_OR_NULL(ch
->sess
))
2228 ch
->sess
= target_alloc_session(&sport
->port_gid_tpg
, 0, 0,
2229 TARGET_PROT_NORMAL
, i_port_id
, ch
,
2231 /* Retry without leading "0x" */
2232 if (sport
->port_gid_tpg
.se_tpg_wwn
&& IS_ERR_OR_NULL(ch
->sess
))
2233 ch
->sess
= target_alloc_session(&sport
->port_gid_tpg
, 0, 0,
2235 i_port_id
+ 2, ch
, NULL
);
2236 if (IS_ERR_OR_NULL(ch
->sess
)) {
2237 ret
= PTR_ERR(ch
->sess
);
2238 pr_info("Rejected login for initiator %s: ret = %d.\n",
2239 ch
->sess_name
, ret
);
2240 rej
->reason
= cpu_to_be32(ret
== -ENOMEM
?
2241 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
:
2242 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED
);
2246 mutex_lock(&sport
->mutex
);
2248 if ((req
->req_flags
& SRP_MTCH_ACTION
) == SRP_MULTICHAN_SINGLE
) {
2249 struct srpt_rdma_ch
*ch2
;
2251 rsp
->rsp_flags
= SRP_LOGIN_RSP_MULTICHAN_NO_CHAN
;
2253 list_for_each_entry(ch2
, &nexus
->ch_list
, list
) {
2254 if (srpt_disconnect_ch(ch2
) < 0)
2256 pr_info("Relogin - closed existing channel %s\n",
2258 rsp
->rsp_flags
= SRP_LOGIN_RSP_MULTICHAN_TERMINATED
;
2261 rsp
->rsp_flags
= SRP_LOGIN_RSP_MULTICHAN_MAINTAINED
;
2264 list_add_tail_rcu(&ch
->list
, &nexus
->ch_list
);
2266 if (!sport
->enabled
) {
2267 rej
->reason
= cpu_to_be32(
2268 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
2269 pr_info("rejected SRP_LOGIN_REQ because target %s_%d is not enabled\n",
2270 sdev
->device
->name
, port_num
);
2271 mutex_unlock(&sport
->mutex
);
2275 mutex_unlock(&sport
->mutex
);
2277 ret
= ch
->using_rdma_cm
? 0 : srpt_ch_qp_rtr(ch
, ch
->qp
);
2279 rej
->reason
= cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
2280 pr_err("rejected SRP_LOGIN_REQ because enabling RTR failed (error code = %d)\n",
2285 pr_debug("Establish connection sess=%p name=%s ch=%p\n", ch
->sess
,
2288 /* create srp_login_response */
2289 rsp
->opcode
= SRP_LOGIN_RSP
;
2290 rsp
->tag
= req
->tag
;
2291 rsp
->max_it_iu_len
= req
->req_it_iu_len
;
2292 rsp
->max_ti_iu_len
= req
->req_it_iu_len
;
2293 ch
->max_ti_iu_len
= it_iu_len
;
2294 rsp
->buf_fmt
= cpu_to_be16(SRP_BUF_FORMAT_DIRECT
|
2295 SRP_BUF_FORMAT_INDIRECT
);
2296 rsp
->req_lim_delta
= cpu_to_be32(ch
->rq_size
);
2297 atomic_set(&ch
->req_lim
, ch
->rq_size
);
2298 atomic_set(&ch
->req_lim_delta
, 0);
2300 /* create cm reply */
2301 if (ch
->using_rdma_cm
) {
2302 rep_param
->rdma_cm
.private_data
= (void *)rsp
;
2303 rep_param
->rdma_cm
.private_data_len
= sizeof(*rsp
);
2304 rep_param
->rdma_cm
.rnr_retry_count
= 7;
2305 rep_param
->rdma_cm
.flow_control
= 1;
2306 rep_param
->rdma_cm
.responder_resources
= 4;
2307 rep_param
->rdma_cm
.initiator_depth
= 4;
2309 rep_param
->ib_cm
.qp_num
= ch
->qp
->qp_num
;
2310 rep_param
->ib_cm
.private_data
= (void *)rsp
;
2311 rep_param
->ib_cm
.private_data_len
= sizeof(*rsp
);
2312 rep_param
->ib_cm
.rnr_retry_count
= 7;
2313 rep_param
->ib_cm
.flow_control
= 1;
2314 rep_param
->ib_cm
.failover_accepted
= 0;
2315 rep_param
->ib_cm
.srq
= 1;
2316 rep_param
->ib_cm
.responder_resources
= 4;
2317 rep_param
->ib_cm
.initiator_depth
= 4;
2321 * Hold the sport mutex while accepting a connection to avoid that
2322 * srpt_disconnect_ch() is invoked concurrently with this code.
2324 mutex_lock(&sport
->mutex
);
2325 if (sport
->enabled
&& ch
->state
== CH_CONNECTING
) {
2326 if (ch
->using_rdma_cm
)
2327 ret
= rdma_accept(rdma_cm_id
, &rep_param
->rdma_cm
);
2329 ret
= ib_send_cm_rep(ib_cm_id
, &rep_param
->ib_cm
);
2333 mutex_unlock(&sport
->mutex
);
2341 rej
->reason
= cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES
);
2342 pr_err("sending SRP_LOGIN_REQ response failed (error code = %d)\n",
2350 srpt_destroy_ch_ib(ch
);
2353 srpt_free_ioctx_ring((struct srpt_ioctx
**)ch
->ioctx_recv_ring
,
2354 ch
->sport
->sdev
, ch
->rq_size
,
2355 srp_max_req_size
, DMA_FROM_DEVICE
);
2358 srpt_free_ioctx_ring((struct srpt_ioctx
**)ch
->ioctx_ring
,
2359 ch
->sport
->sdev
, ch
->rq_size
,
2360 ch
->max_rsp_size
, DMA_TO_DEVICE
);
2363 ib_cm_id
->context
= NULL
;
2367 WARN_ON_ONCE(ret
== 0);
2370 pr_info("Rejecting login with reason %#x\n", be32_to_cpu(rej
->reason
));
2371 rej
->opcode
= SRP_LOGIN_REJ
;
2372 rej
->tag
= req
->tag
;
2373 rej
->buf_fmt
= cpu_to_be16(SRP_BUF_FORMAT_DIRECT
|
2374 SRP_BUF_FORMAT_INDIRECT
);
2377 rdma_reject(rdma_cm_id
, rej
, sizeof(*rej
));
2379 ib_send_cm_rej(ib_cm_id
, IB_CM_REJ_CONSUMER_DEFINED
, NULL
, 0,
2390 static int srpt_ib_cm_req_recv(struct ib_cm_id
*cm_id
,
2391 struct ib_cm_req_event_param
*param
,
2396 srpt_format_guid(sguid
, sizeof(sguid
),
2397 ¶m
->primary_path
->dgid
.global
.interface_id
);
2399 return srpt_cm_req_recv(cm_id
->context
, cm_id
, NULL
, param
->port
,
2400 param
->primary_path
->pkey
,
2401 private_data
, sguid
);
2404 static int srpt_rdma_cm_req_recv(struct rdma_cm_id
*cm_id
,
2405 struct rdma_cm_event
*event
)
2407 struct srpt_device
*sdev
;
2408 struct srp_login_req req
;
2409 const struct srp_login_req_rdma
*req_rdma
;
2412 sdev
= ib_get_client_data(cm_id
->device
, &srpt_client
);
2414 return -ECONNREFUSED
;
2416 if (event
->param
.conn
.private_data_len
< sizeof(*req_rdma
))
2419 /* Transform srp_login_req_rdma into srp_login_req. */
2420 req_rdma
= event
->param
.conn
.private_data
;
2421 memset(&req
, 0, sizeof(req
));
2422 req
.opcode
= req_rdma
->opcode
;
2423 req
.tag
= req_rdma
->tag
;
2424 req
.req_it_iu_len
= req_rdma
->req_it_iu_len
;
2425 req
.req_buf_fmt
= req_rdma
->req_buf_fmt
;
2426 req
.req_flags
= req_rdma
->req_flags
;
2427 memcpy(req
.initiator_port_id
, req_rdma
->initiator_port_id
, 16);
2428 memcpy(req
.target_port_id
, req_rdma
->target_port_id
, 16);
2430 snprintf(src_addr
, sizeof(src_addr
), "%pIS",
2431 &cm_id
->route
.addr
.src_addr
);
2433 return srpt_cm_req_recv(sdev
, NULL
, cm_id
, cm_id
->port_num
,
2434 cm_id
->route
.path_rec
->pkey
, &req
, src_addr
);
2437 static void srpt_cm_rej_recv(struct srpt_rdma_ch
*ch
,
2438 enum ib_cm_rej_reason reason
,
2439 const u8
*private_data
,
2440 u8 private_data_len
)
2445 if (private_data_len
&& (priv
= kmalloc(private_data_len
* 3 + 1,
2447 for (i
= 0; i
< private_data_len
; i
++)
2448 sprintf(priv
+ 3 * i
, " %02x", private_data
[i
]);
2450 pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n",
2451 ch
->sess_name
, ch
->qp
->qp_num
, reason
, private_data_len
?
2452 "; private data" : "", priv
? priv
: " (?)");
2457 * srpt_cm_rtu_recv - process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event
2458 * @ch: SRPT RDMA channel.
2460 * An RTU (ready to use) message indicates that the connection has been
2461 * established and that the recipient may begin transmitting.
2463 static void srpt_cm_rtu_recv(struct srpt_rdma_ch
*ch
)
2467 ret
= ch
->using_rdma_cm
? 0 : srpt_ch_qp_rts(ch
, ch
->qp
);
2469 pr_err("%s-%d: QP transition to RTS failed\n", ch
->sess_name
,
2476 * Note: calling srpt_close_ch() if the transition to the LIVE state
2477 * fails is not necessary since that means that that function has
2478 * already been invoked from another thread.
2480 if (!srpt_set_ch_state(ch
, CH_LIVE
)) {
2481 pr_err("%s-%d: channel transition to LIVE state failed\n",
2482 ch
->sess_name
, ch
->qp
->qp_num
);
2486 /* Trigger wait list processing. */
2487 ret
= srpt_zerolength_write(ch
);
2488 WARN_ONCE(ret
< 0, "%d\n", ret
);
2492 * srpt_cm_handler - IB connection manager callback function
2493 * @cm_id: IB/CM connection identifier.
2494 * @event: IB/CM event.
2496 * A non-zero return value will cause the caller destroy the CM ID.
2498 * Note: srpt_cm_handler() must only return a non-zero value when transferring
2499 * ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
2500 * a non-zero value in any other case will trigger a race with the
2501 * ib_destroy_cm_id() call in srpt_release_channel().
2503 static int srpt_cm_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
)
2505 struct srpt_rdma_ch
*ch
= cm_id
->context
;
2509 switch (event
->event
) {
2510 case IB_CM_REQ_RECEIVED
:
2511 ret
= srpt_ib_cm_req_recv(cm_id
, &event
->param
.req_rcvd
,
2512 event
->private_data
);
2514 case IB_CM_REJ_RECEIVED
:
2515 srpt_cm_rej_recv(ch
, event
->param
.rej_rcvd
.reason
,
2516 event
->private_data
,
2517 IB_CM_REJ_PRIVATE_DATA_SIZE
);
2519 case IB_CM_RTU_RECEIVED
:
2520 case IB_CM_USER_ESTABLISHED
:
2521 srpt_cm_rtu_recv(ch
);
2523 case IB_CM_DREQ_RECEIVED
:
2524 srpt_disconnect_ch(ch
);
2526 case IB_CM_DREP_RECEIVED
:
2527 pr_info("Received CM DREP message for ch %s-%d.\n",
2528 ch
->sess_name
, ch
->qp
->qp_num
);
2531 case IB_CM_TIMEWAIT_EXIT
:
2532 pr_info("Received CM TimeWait exit for ch %s-%d.\n",
2533 ch
->sess_name
, ch
->qp
->qp_num
);
2536 case IB_CM_REP_ERROR
:
2537 pr_info("Received CM REP error for ch %s-%d.\n", ch
->sess_name
,
2540 case IB_CM_DREQ_ERROR
:
2541 pr_info("Received CM DREQ ERROR event.\n");
2543 case IB_CM_MRA_RECEIVED
:
2544 pr_info("Received CM MRA event\n");
2547 pr_err("received unrecognized CM event %d\n", event
->event
);
2554 static int srpt_rdma_cm_handler(struct rdma_cm_id
*cm_id
,
2555 struct rdma_cm_event
*event
)
2557 struct srpt_rdma_ch
*ch
= cm_id
->context
;
2560 switch (event
->event
) {
2561 case RDMA_CM_EVENT_CONNECT_REQUEST
:
2562 ret
= srpt_rdma_cm_req_recv(cm_id
, event
);
2564 case RDMA_CM_EVENT_REJECTED
:
2565 srpt_cm_rej_recv(ch
, event
->status
,
2566 event
->param
.conn
.private_data
,
2567 event
->param
.conn
.private_data_len
);
2569 case RDMA_CM_EVENT_ESTABLISHED
:
2570 srpt_cm_rtu_recv(ch
);
2572 case RDMA_CM_EVENT_DISCONNECTED
:
2573 if (ch
->state
< CH_DISCONNECTING
)
2574 srpt_disconnect_ch(ch
);
2578 case RDMA_CM_EVENT_TIMEWAIT_EXIT
:
2581 case RDMA_CM_EVENT_UNREACHABLE
:
2582 pr_info("Received CM REP error for ch %s-%d.\n", ch
->sess_name
,
2585 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
2586 case RDMA_CM_EVENT_ADDR_CHANGE
:
2589 pr_err("received unrecognized RDMA CM event %d\n",
2597 static int srpt_write_pending_status(struct se_cmd
*se_cmd
)
2599 struct srpt_send_ioctx
*ioctx
;
2601 ioctx
= container_of(se_cmd
, struct srpt_send_ioctx
, cmd
);
2602 return ioctx
->state
== SRPT_STATE_NEED_DATA
;
2606 * srpt_write_pending - Start data transfer from initiator to target (write).
2608 static int srpt_write_pending(struct se_cmd
*se_cmd
)
2610 struct srpt_send_ioctx
*ioctx
=
2611 container_of(se_cmd
, struct srpt_send_ioctx
, cmd
);
2612 struct srpt_rdma_ch
*ch
= ioctx
->ch
;
2613 struct ib_send_wr
*first_wr
= NULL
, *bad_wr
;
2614 struct ib_cqe
*cqe
= &ioctx
->rdma_cqe
;
2615 enum srpt_command_state new_state
;
2618 new_state
= srpt_set_cmd_state(ioctx
, SRPT_STATE_NEED_DATA
);
2619 WARN_ON(new_state
== SRPT_STATE_DONE
);
2621 if (atomic_sub_return(ioctx
->n_rdma
, &ch
->sq_wr_avail
) < 0) {
2622 pr_warn("%s: IB send queue full (needed %d)\n",
2623 __func__
, ioctx
->n_rdma
);
2628 cqe
->done
= srpt_rdma_read_done
;
2629 for (i
= ioctx
->n_rw_ctx
- 1; i
>= 0; i
--) {
2630 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
2632 first_wr
= rdma_rw_ctx_wrs(&ctx
->rw
, ch
->qp
, ch
->sport
->port
,
2637 ret
= ib_post_send(ch
->qp
, first_wr
, &bad_wr
);
2639 pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n",
2640 __func__
, ret
, ioctx
->n_rdma
,
2641 atomic_read(&ch
->sq_wr_avail
));
2647 atomic_add(ioctx
->n_rdma
, &ch
->sq_wr_avail
);
2651 static u8
tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status
)
2653 switch (tcm_mgmt_status
) {
2654 case TMR_FUNCTION_COMPLETE
:
2655 return SRP_TSK_MGMT_SUCCESS
;
2656 case TMR_FUNCTION_REJECTED
:
2657 return SRP_TSK_MGMT_FUNC_NOT_SUPP
;
2659 return SRP_TSK_MGMT_FAILED
;
2663 * srpt_queue_response - transmit the response to a SCSI command
2664 * @cmd: SCSI target command.
2666 * Callback function called by the TCM core. Must not block since it can be
2667 * invoked on the context of the IB completion handler.
2669 static void srpt_queue_response(struct se_cmd
*cmd
)
2671 struct srpt_send_ioctx
*ioctx
=
2672 container_of(cmd
, struct srpt_send_ioctx
, cmd
);
2673 struct srpt_rdma_ch
*ch
= ioctx
->ch
;
2674 struct srpt_device
*sdev
= ch
->sport
->sdev
;
2675 struct ib_send_wr send_wr
, *first_wr
= &send_wr
, *bad_wr
;
2677 enum srpt_command_state state
;
2678 int resp_len
, ret
, i
;
2683 state
= ioctx
->state
;
2685 case SRPT_STATE_NEW
:
2686 case SRPT_STATE_DATA_IN
:
2687 ioctx
->state
= SRPT_STATE_CMD_RSP_SENT
;
2689 case SRPT_STATE_MGMT
:
2690 ioctx
->state
= SRPT_STATE_MGMT_RSP_SENT
;
2693 WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
2694 ch
, ioctx
->ioctx
.index
, ioctx
->state
);
2698 if (unlikely(WARN_ON_ONCE(state
== SRPT_STATE_CMD_RSP_SENT
)))
2701 /* For read commands, transfer the data to the initiator. */
2702 if (ioctx
->cmd
.data_direction
== DMA_FROM_DEVICE
&&
2703 ioctx
->cmd
.data_length
&&
2704 !ioctx
->queue_status_only
) {
2705 for (i
= ioctx
->n_rw_ctx
- 1; i
>= 0; i
--) {
2706 struct srpt_rw_ctx
*ctx
= &ioctx
->rw_ctxs
[i
];
2708 first_wr
= rdma_rw_ctx_wrs(&ctx
->rw
, ch
->qp
,
2709 ch
->sport
->port
, NULL
, first_wr
);
2713 if (state
!= SRPT_STATE_MGMT
)
2714 resp_len
= srpt_build_cmd_rsp(ch
, ioctx
, ioctx
->cmd
.tag
,
2718 = tcm_to_srp_tsk_mgmt_status(cmd
->se_tmr_req
->response
);
2719 resp_len
= srpt_build_tskmgmt_rsp(ch
, ioctx
, srp_tm_status
,
2723 atomic_inc(&ch
->req_lim
);
2725 if (unlikely(atomic_sub_return(1 + ioctx
->n_rdma
,
2726 &ch
->sq_wr_avail
) < 0)) {
2727 pr_warn("%s: IB send queue full (needed %d)\n",
2728 __func__
, ioctx
->n_rdma
);
2733 ib_dma_sync_single_for_device(sdev
->device
, ioctx
->ioctx
.dma
, resp_len
,
2736 sge
.addr
= ioctx
->ioctx
.dma
;
2737 sge
.length
= resp_len
;
2738 sge
.lkey
= sdev
->lkey
;
2740 ioctx
->ioctx
.cqe
.done
= srpt_send_done
;
2741 send_wr
.next
= NULL
;
2742 send_wr
.wr_cqe
= &ioctx
->ioctx
.cqe
;
2743 send_wr
.sg_list
= &sge
;
2744 send_wr
.num_sge
= 1;
2745 send_wr
.opcode
= IB_WR_SEND
;
2746 send_wr
.send_flags
= IB_SEND_SIGNALED
;
2748 ret
= ib_post_send(ch
->qp
, first_wr
, &bad_wr
);
2750 pr_err("%s: sending cmd response failed for tag %llu (%d)\n",
2751 __func__
, ioctx
->cmd
.tag
, ret
);
2758 atomic_add(1 + ioctx
->n_rdma
, &ch
->sq_wr_avail
);
2759 atomic_dec(&ch
->req_lim
);
2760 srpt_set_cmd_state(ioctx
, SRPT_STATE_DONE
);
2761 target_put_sess_cmd(&ioctx
->cmd
);
2764 static int srpt_queue_data_in(struct se_cmd
*cmd
)
2766 srpt_queue_response(cmd
);
2770 static void srpt_queue_tm_rsp(struct se_cmd
*cmd
)
2772 srpt_queue_response(cmd
);
2775 static void srpt_aborted_task(struct se_cmd
*cmd
)
2779 static int srpt_queue_status(struct se_cmd
*cmd
)
2781 struct srpt_send_ioctx
*ioctx
;
2783 ioctx
= container_of(cmd
, struct srpt_send_ioctx
, cmd
);
2784 BUG_ON(ioctx
->sense_data
!= cmd
->sense_buffer
);
2785 if (cmd
->se_cmd_flags
&
2786 (SCF_TRANSPORT_TASK_SENSE
| SCF_EMULATED_TASK_SENSE
))
2787 WARN_ON(cmd
->scsi_status
!= SAM_STAT_CHECK_CONDITION
);
2788 ioctx
->queue_status_only
= true;
2789 srpt_queue_response(cmd
);
2793 static void srpt_refresh_port_work(struct work_struct
*work
)
2795 struct srpt_port
*sport
= container_of(work
, struct srpt_port
, work
);
2797 srpt_refresh_port(sport
);
2800 static bool srpt_ch_list_empty(struct srpt_port
*sport
)
2802 struct srpt_nexus
*nexus
;
2806 list_for_each_entry(nexus
, &sport
->nexus_list
, entry
)
2807 if (!list_empty(&nexus
->ch_list
))
2815 * srpt_release_sport - disable login and wait for associated channels
2816 * @sport: SRPT HCA port.
2818 static int srpt_release_sport(struct srpt_port
*sport
)
2820 struct srpt_nexus
*nexus
, *next_n
;
2821 struct srpt_rdma_ch
*ch
;
2823 WARN_ON_ONCE(irqs_disabled());
2825 mutex_lock(&sport
->mutex
);
2826 srpt_set_enabled(sport
, false);
2827 mutex_unlock(&sport
->mutex
);
2829 while (wait_event_timeout(sport
->ch_releaseQ
,
2830 srpt_ch_list_empty(sport
), 5 * HZ
) <= 0) {
2831 pr_info("%s_%d: waiting for session unregistration ...\n",
2832 sport
->sdev
->device
->name
, sport
->port
);
2834 list_for_each_entry(nexus
, &sport
->nexus_list
, entry
) {
2835 list_for_each_entry(ch
, &nexus
->ch_list
, list
) {
2836 pr_info("%s-%d: state %s\n",
2837 ch
->sess_name
, ch
->qp
->qp_num
,
2838 get_ch_state_name(ch
->state
));
2844 mutex_lock(&sport
->mutex
);
2845 list_for_each_entry_safe(nexus
, next_n
, &sport
->nexus_list
, entry
) {
2846 list_del(&nexus
->entry
);
2847 kfree_rcu(nexus
, rcu
);
2849 mutex_unlock(&sport
->mutex
);
2854 static struct se_wwn
*__srpt_lookup_wwn(const char *name
)
2856 struct ib_device
*dev
;
2857 struct srpt_device
*sdev
;
2858 struct srpt_port
*sport
;
2861 list_for_each_entry(sdev
, &srpt_dev_list
, list
) {
2866 for (i
= 0; i
< dev
->phys_port_cnt
; i
++) {
2867 sport
= &sdev
->port
[i
];
2869 if (strcmp(sport
->port_guid
, name
) == 0)
2870 return &sport
->port_guid_wwn
;
2871 if (strcmp(sport
->port_gid
, name
) == 0)
2872 return &sport
->port_gid_wwn
;
2879 static struct se_wwn
*srpt_lookup_wwn(const char *name
)
2883 spin_lock(&srpt_dev_lock
);
2884 wwn
= __srpt_lookup_wwn(name
);
2885 spin_unlock(&srpt_dev_lock
);
2890 static void srpt_free_srq(struct srpt_device
*sdev
)
2895 ib_destroy_srq(sdev
->srq
);
2896 srpt_free_ioctx_ring((struct srpt_ioctx
**)sdev
->ioctx_ring
, sdev
,
2897 sdev
->srq_size
, srp_max_req_size
, DMA_FROM_DEVICE
);
2901 static int srpt_alloc_srq(struct srpt_device
*sdev
)
2903 struct ib_srq_init_attr srq_attr
= {
2904 .event_handler
= srpt_srq_event
,
2905 .srq_context
= (void *)sdev
,
2906 .attr
.max_wr
= sdev
->srq_size
,
2908 .srq_type
= IB_SRQT_BASIC
,
2910 struct ib_device
*device
= sdev
->device
;
2914 WARN_ON_ONCE(sdev
->srq
);
2915 srq
= ib_create_srq(sdev
->pd
, &srq_attr
);
2917 pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(srq
));
2918 return PTR_ERR(srq
);
2921 pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", sdev
->srq_size
,
2922 sdev
->device
->attrs
.max_srq_wr
, device
->name
);
2924 sdev
->ioctx_ring
= (struct srpt_recv_ioctx
**)
2925 srpt_alloc_ioctx_ring(sdev
, sdev
->srq_size
,
2926 sizeof(*sdev
->ioctx_ring
[0]),
2927 srp_max_req_size
, DMA_FROM_DEVICE
);
2928 if (!sdev
->ioctx_ring
) {
2929 ib_destroy_srq(srq
);
2933 sdev
->use_srq
= true;
2936 for (i
= 0; i
< sdev
->srq_size
; ++i
) {
2937 INIT_LIST_HEAD(&sdev
->ioctx_ring
[i
]->wait_list
);
2938 srpt_post_recv(sdev
, NULL
, sdev
->ioctx_ring
[i
]);
2944 static int srpt_use_srq(struct srpt_device
*sdev
, bool use_srq
)
2946 struct ib_device
*device
= sdev
->device
;
2950 srpt_free_srq(sdev
);
2951 sdev
->use_srq
= false;
2952 } else if (use_srq
&& !sdev
->srq
) {
2953 ret
= srpt_alloc_srq(sdev
);
2955 pr_debug("%s(%s): use_srq = %d; ret = %d\n", __func__
, device
->name
,
2956 sdev
->use_srq
, ret
);
2961 * srpt_add_one - InfiniBand device addition callback function
2962 * @device: Describes a HCA.
2964 static void srpt_add_one(struct ib_device
*device
)
2966 struct srpt_device
*sdev
;
2967 struct srpt_port
*sport
;
2970 pr_debug("device = %p\n", device
);
2972 sdev
= kzalloc(sizeof(*sdev
), GFP_KERNEL
);
2976 sdev
->device
= device
;
2977 mutex_init(&sdev
->sdev_mutex
);
2979 sdev
->pd
= ib_alloc_pd(device
, 0);
2980 if (IS_ERR(sdev
->pd
))
2983 sdev
->lkey
= sdev
->pd
->local_dma_lkey
;
2985 sdev
->srq_size
= min(srpt_srq_size
, sdev
->device
->attrs
.max_srq_wr
);
2987 srpt_use_srq(sdev
, sdev
->port
[0].port_attrib
.use_srq
);
2989 if (!srpt_service_guid
)
2990 srpt_service_guid
= be64_to_cpu(device
->node_guid
);
2992 if (rdma_port_get_link_layer(device
, 1) == IB_LINK_LAYER_INFINIBAND
)
2993 sdev
->cm_id
= ib_create_cm_id(device
, srpt_cm_handler
, sdev
);
2994 if (IS_ERR(sdev
->cm_id
)) {
2995 pr_info("ib_create_cm_id() failed: %ld\n",
2996 PTR_ERR(sdev
->cm_id
));
3002 /* print out target login information */
3003 pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,"
3004 "pkey=ffff,service_id=%016llx\n", srpt_service_guid
,
3005 srpt_service_guid
, srpt_service_guid
);
3008 * We do not have a consistent service_id (ie. also id_ext of target_id)
3009 * to identify this target. We currently use the guid of the first HCA
3010 * in the system as service_id; therefore, the target_id will change
3011 * if this HCA is gone bad and replaced by different HCA
3014 ib_cm_listen(sdev
->cm_id
, cpu_to_be64(srpt_service_guid
), 0) :
3017 pr_err("ib_cm_listen() failed: %d (cm_id state = %d)\n", ret
,
3018 sdev
->cm_id
->state
);
3022 INIT_IB_EVENT_HANDLER(&sdev
->event_handler
, sdev
->device
,
3023 srpt_event_handler
);
3024 ib_register_event_handler(&sdev
->event_handler
);
3026 WARN_ON(sdev
->device
->phys_port_cnt
> ARRAY_SIZE(sdev
->port
));
3028 for (i
= 1; i
<= sdev
->device
->phys_port_cnt
; i
++) {
3029 sport
= &sdev
->port
[i
- 1];
3030 INIT_LIST_HEAD(&sport
->nexus_list
);
3031 init_waitqueue_head(&sport
->ch_releaseQ
);
3032 mutex_init(&sport
->mutex
);
3035 sport
->port_attrib
.srp_max_rdma_size
= DEFAULT_MAX_RDMA_SIZE
;
3036 sport
->port_attrib
.srp_max_rsp_size
= DEFAULT_MAX_RSP_SIZE
;
3037 sport
->port_attrib
.srp_sq_size
= DEF_SRPT_SQ_SIZE
;
3038 sport
->port_attrib
.use_srq
= false;
3039 INIT_WORK(&sport
->work
, srpt_refresh_port_work
);
3041 if (srpt_refresh_port(sport
)) {
3042 pr_err("MAD registration failed for %s-%d.\n",
3043 sdev
->device
->name
, i
);
3048 spin_lock(&srpt_dev_lock
);
3049 list_add_tail(&sdev
->list
, &srpt_dev_list
);
3050 spin_unlock(&srpt_dev_lock
);
3053 ib_set_client_data(device
, &srpt_client
, sdev
);
3054 pr_debug("added %s.\n", device
->name
);
3058 ib_unregister_event_handler(&sdev
->event_handler
);
3061 ib_destroy_cm_id(sdev
->cm_id
);
3063 srpt_free_srq(sdev
);
3064 ib_dealloc_pd(sdev
->pd
);
3069 pr_info("%s(%s) failed.\n", __func__
, device
->name
);
3074 * srpt_remove_one - InfiniBand device removal callback function
3075 * @device: Describes a HCA.
3076 * @client_data: The value passed as the third argument to ib_set_client_data().
3078 static void srpt_remove_one(struct ib_device
*device
, void *client_data
)
3080 struct srpt_device
*sdev
= client_data
;
3084 pr_info("%s(%s): nothing to do.\n", __func__
, device
->name
);
3088 srpt_unregister_mad_agent(sdev
);
3090 ib_unregister_event_handler(&sdev
->event_handler
);
3092 /* Cancel any work queued by the just unregistered IB event handler. */
3093 for (i
= 0; i
< sdev
->device
->phys_port_cnt
; i
++)
3094 cancel_work_sync(&sdev
->port
[i
].work
);
3097 ib_destroy_cm_id(sdev
->cm_id
);
3099 ib_set_client_data(device
, &srpt_client
, NULL
);
3102 * Unregistering a target must happen after destroying sdev->cm_id
3103 * such that no new SRP_LOGIN_REQ information units can arrive while
3104 * destroying the target.
3106 spin_lock(&srpt_dev_lock
);
3107 list_del(&sdev
->list
);
3108 spin_unlock(&srpt_dev_lock
);
3110 for (i
= 0; i
< sdev
->device
->phys_port_cnt
; i
++)
3111 srpt_release_sport(&sdev
->port
[i
]);
3113 srpt_free_srq(sdev
);
3115 ib_dealloc_pd(sdev
->pd
);
3120 static struct ib_client srpt_client
= {
3122 .add
= srpt_add_one
,
3123 .remove
= srpt_remove_one
3126 static int srpt_check_true(struct se_portal_group
*se_tpg
)
3131 static int srpt_check_false(struct se_portal_group
*se_tpg
)
3136 static char *srpt_get_fabric_name(void)
3141 static struct srpt_port
*srpt_tpg_to_sport(struct se_portal_group
*tpg
)
3143 return tpg
->se_tpg_wwn
->priv
;
3146 static char *srpt_get_fabric_wwn(struct se_portal_group
*tpg
)
3148 struct srpt_port
*sport
= srpt_tpg_to_sport(tpg
);
3150 WARN_ON_ONCE(tpg
!= &sport
->port_guid_tpg
&&
3151 tpg
!= &sport
->port_gid_tpg
);
3152 return tpg
== &sport
->port_guid_tpg
? sport
->port_guid
:
3156 static u16
srpt_get_tag(struct se_portal_group
*tpg
)
3161 static u32
srpt_tpg_get_inst_index(struct se_portal_group
*se_tpg
)
3166 static void srpt_release_cmd(struct se_cmd
*se_cmd
)
3168 struct srpt_send_ioctx
*ioctx
= container_of(se_cmd
,
3169 struct srpt_send_ioctx
, cmd
);
3170 struct srpt_rdma_ch
*ch
= ioctx
->ch
;
3171 unsigned long flags
;
3173 WARN_ON_ONCE(ioctx
->state
!= SRPT_STATE_DONE
&&
3174 !(ioctx
->cmd
.transport_state
& CMD_T_ABORTED
));
3176 if (ioctx
->n_rw_ctx
) {
3177 srpt_free_rw_ctxs(ch
, ioctx
);
3178 ioctx
->n_rw_ctx
= 0;
3181 spin_lock_irqsave(&ch
->spinlock
, flags
);
3182 list_add(&ioctx
->free_list
, &ch
->free_list
);
3183 spin_unlock_irqrestore(&ch
->spinlock
, flags
);
3187 * srpt_close_session - forcibly close a session
3188 * @se_sess: SCSI target session.
3190 * Callback function invoked by the TCM core to clean up sessions associated
3191 * with a node ACL when the user invokes
3192 * rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3194 static void srpt_close_session(struct se_session
*se_sess
)
3196 struct srpt_rdma_ch
*ch
= se_sess
->fabric_sess_ptr
;
3198 srpt_disconnect_ch_sync(ch
);
3202 * srpt_sess_get_index - return the value of scsiAttIntrPortIndex (SCSI-MIB)
3203 * @se_sess: SCSI target session.
3205 * A quote from RFC 4455 (SCSI-MIB) about this MIB object:
3206 * This object represents an arbitrary integer used to uniquely identify a
3207 * particular attached remote initiator port to a particular SCSI target port
3208 * within a particular SCSI target device within a particular SCSI instance.
3210 static u32
srpt_sess_get_index(struct se_session
*se_sess
)
3215 static void srpt_set_default_node_attrs(struct se_node_acl
*nacl
)
3219 /* Note: only used from inside debug printk's by the TCM core. */
3220 static int srpt_get_tcm_cmd_state(struct se_cmd
*se_cmd
)
3222 struct srpt_send_ioctx
*ioctx
;
3224 ioctx
= container_of(se_cmd
, struct srpt_send_ioctx
, cmd
);
3225 return ioctx
->state
;
3228 static int srpt_parse_guid(u64
*guid
, const char *name
)
3233 if (sscanf(name
, "%hx:%hx:%hx:%hx", &w
[0], &w
[1], &w
[2], &w
[3]) != 4)
3235 *guid
= get_unaligned_be64(w
);
3242 * srpt_parse_i_port_id - parse an initiator port ID
3243 * @name: ASCII representation of a 128-bit initiator port ID.
3244 * @i_port_id: Binary 128-bit port ID.
3246 static int srpt_parse_i_port_id(u8 i_port_id
[16], const char *name
)
3249 unsigned len
, count
, leading_zero_bytes
;
3253 if (strncasecmp(p
, "0x", 2) == 0)
3259 count
= min(len
/ 2, 16U);
3260 leading_zero_bytes
= 16 - count
;
3261 memset(i_port_id
, 0, leading_zero_bytes
);
3262 ret
= hex2bin(i_port_id
+ leading_zero_bytes
, p
, count
);
3269 * configfs callback function invoked for mkdir
3270 * /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
3272 * i_port_id must be an initiator port GUID, GID or IP address. See also the
3273 * target_alloc_session() calls in this driver. Examples of valid initiator
3275 * 0x0000000000000000505400fffe4a0b7b
3276 * 0000000000000000505400fffe4a0b7b
3277 * 5054:00ff:fe4a:0b7b
3280 static int srpt_init_nodeacl(struct se_node_acl
*se_nacl
, const char *name
)
3282 struct sockaddr_storage sa
;
3287 ret
= srpt_parse_guid(&guid
, name
);
3289 ret
= srpt_parse_i_port_id(i_port_id
, name
);
3291 ret
= inet_pton_with_scope(&init_net
, AF_UNSPEC
, name
, NULL
,
3294 pr_err("invalid initiator port ID %s\n", name
);
3298 static ssize_t
srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item
*item
,
3301 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
3302 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
3304 return sprintf(page
, "%u\n", sport
->port_attrib
.srp_max_rdma_size
);
3307 static ssize_t
srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item
*item
,
3308 const char *page
, size_t count
)
3310 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
3311 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
3315 ret
= kstrtoul(page
, 0, &val
);
3317 pr_err("kstrtoul() failed with ret: %d\n", ret
);
3320 if (val
> MAX_SRPT_RDMA_SIZE
) {
3321 pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val
,
3322 MAX_SRPT_RDMA_SIZE
);
3325 if (val
< DEFAULT_MAX_RDMA_SIZE
) {
3326 pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
3327 val
, DEFAULT_MAX_RDMA_SIZE
);
3330 sport
->port_attrib
.srp_max_rdma_size
= val
;
3335 static ssize_t
srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item
*item
,
3338 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
3339 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
3341 return sprintf(page
, "%u\n", sport
->port_attrib
.srp_max_rsp_size
);
3344 static ssize_t
srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item
*item
,
3345 const char *page
, size_t count
)
3347 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
3348 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
3352 ret
= kstrtoul(page
, 0, &val
);
3354 pr_err("kstrtoul() failed with ret: %d\n", ret
);
3357 if (val
> MAX_SRPT_RSP_SIZE
) {
3358 pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val
,
3362 if (val
< MIN_MAX_RSP_SIZE
) {
3363 pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val
,
3367 sport
->port_attrib
.srp_max_rsp_size
= val
;
3372 static ssize_t
srpt_tpg_attrib_srp_sq_size_show(struct config_item
*item
,
3375 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
3376 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
3378 return sprintf(page
, "%u\n", sport
->port_attrib
.srp_sq_size
);
3381 static ssize_t
srpt_tpg_attrib_srp_sq_size_store(struct config_item
*item
,
3382 const char *page
, size_t count
)
3384 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
3385 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
3389 ret
= kstrtoul(page
, 0, &val
);
3391 pr_err("kstrtoul() failed with ret: %d\n", ret
);
3394 if (val
> MAX_SRPT_SRQ_SIZE
) {
3395 pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val
,
3399 if (val
< MIN_SRPT_SRQ_SIZE
) {
3400 pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val
,
3404 sport
->port_attrib
.srp_sq_size
= val
;
3409 static ssize_t
srpt_tpg_attrib_use_srq_show(struct config_item
*item
,
3412 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
3413 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
3415 return sprintf(page
, "%d\n", sport
->port_attrib
.use_srq
);
3418 static ssize_t
srpt_tpg_attrib_use_srq_store(struct config_item
*item
,
3419 const char *page
, size_t count
)
3421 struct se_portal_group
*se_tpg
= attrib_to_tpg(item
);
3422 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
3423 struct srpt_device
*sdev
= sport
->sdev
;
3428 ret
= kstrtoul(page
, 0, &val
);
3434 ret
= mutex_lock_interruptible(&sdev
->sdev_mutex
);
3437 ret
= mutex_lock_interruptible(&sport
->mutex
);
3440 enabled
= sport
->enabled
;
3441 /* Log out all initiator systems before changing 'use_srq'. */
3442 srpt_set_enabled(sport
, false);
3443 sport
->port_attrib
.use_srq
= val
;
3444 srpt_use_srq(sdev
, sport
->port_attrib
.use_srq
);
3445 srpt_set_enabled(sport
, enabled
);
3447 mutex_unlock(&sport
->mutex
);
3449 mutex_unlock(&sdev
->sdev_mutex
);
3454 CONFIGFS_ATTR(srpt_tpg_attrib_
, srp_max_rdma_size
);
3455 CONFIGFS_ATTR(srpt_tpg_attrib_
, srp_max_rsp_size
);
3456 CONFIGFS_ATTR(srpt_tpg_attrib_
, srp_sq_size
);
3457 CONFIGFS_ATTR(srpt_tpg_attrib_
, use_srq
);
3459 static struct configfs_attribute
*srpt_tpg_attrib_attrs
[] = {
3460 &srpt_tpg_attrib_attr_srp_max_rdma_size
,
3461 &srpt_tpg_attrib_attr_srp_max_rsp_size
,
3462 &srpt_tpg_attrib_attr_srp_sq_size
,
3463 &srpt_tpg_attrib_attr_use_srq
,
3467 static struct rdma_cm_id
*srpt_create_rdma_id(struct sockaddr
*listen_addr
)
3469 struct rdma_cm_id
*rdma_cm_id
;
3472 rdma_cm_id
= rdma_create_id(&init_net
, srpt_rdma_cm_handler
,
3473 NULL
, RDMA_PS_TCP
, IB_QPT_RC
);
3474 if (IS_ERR(rdma_cm_id
)) {
3475 pr_err("RDMA/CM ID creation failed: %ld\n",
3476 PTR_ERR(rdma_cm_id
));
3480 ret
= rdma_bind_addr(rdma_cm_id
, listen_addr
);
3484 snprintf(addr_str
, sizeof(addr_str
), "%pISp", listen_addr
);
3485 pr_err("Binding RDMA/CM ID to address %s failed: %d\n",
3487 rdma_destroy_id(rdma_cm_id
);
3488 rdma_cm_id
= ERR_PTR(ret
);
3492 ret
= rdma_listen(rdma_cm_id
, 128);
3494 pr_err("rdma_listen() failed: %d\n", ret
);
3495 rdma_destroy_id(rdma_cm_id
);
3496 rdma_cm_id
= ERR_PTR(ret
);
3503 static ssize_t
srpt_rdma_cm_port_show(struct config_item
*item
, char *page
)
3505 return sprintf(page
, "%d\n", rdma_cm_port
);
3508 static ssize_t
srpt_rdma_cm_port_store(struct config_item
*item
,
3509 const char *page
, size_t count
)
3511 struct sockaddr_in addr4
= { .sin_family
= AF_INET
};
3512 struct sockaddr_in6 addr6
= { .sin6_family
= AF_INET6
};
3513 struct rdma_cm_id
*new_id
= NULL
;
3517 ret
= kstrtou16(page
, 0, &val
);
3521 if (rdma_cm_port
== val
)
3525 addr6
.sin6_port
= cpu_to_be16(val
);
3526 new_id
= srpt_create_rdma_id((struct sockaddr
*)&addr6
);
3527 if (IS_ERR(new_id
)) {
3528 addr4
.sin_port
= cpu_to_be16(val
);
3529 new_id
= srpt_create_rdma_id((struct sockaddr
*)&addr4
);
3530 if (IS_ERR(new_id
)) {
3531 ret
= PTR_ERR(new_id
);
3537 mutex_lock(&rdma_cm_mutex
);
3539 swap(rdma_cm_id
, new_id
);
3540 mutex_unlock(&rdma_cm_mutex
);
3543 rdma_destroy_id(new_id
);
3549 CONFIGFS_ATTR(srpt_
, rdma_cm_port
);
3551 static struct configfs_attribute
*srpt_da_attrs
[] = {
3552 &srpt_attr_rdma_cm_port
,
3556 static ssize_t
srpt_tpg_enable_show(struct config_item
*item
, char *page
)
3558 struct se_portal_group
*se_tpg
= to_tpg(item
);
3559 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
3561 return snprintf(page
, PAGE_SIZE
, "%d\n", (sport
->enabled
) ? 1: 0);
3564 static ssize_t
srpt_tpg_enable_store(struct config_item
*item
,
3565 const char *page
, size_t count
)
3567 struct se_portal_group
*se_tpg
= to_tpg(item
);
3568 struct srpt_port
*sport
= srpt_tpg_to_sport(se_tpg
);
3572 ret
= kstrtoul(page
, 0, &tmp
);
3574 pr_err("Unable to extract srpt_tpg_store_enable\n");
3578 if ((tmp
!= 0) && (tmp
!= 1)) {
3579 pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp
);
3583 mutex_lock(&sport
->mutex
);
3584 srpt_set_enabled(sport
, tmp
);
3585 mutex_unlock(&sport
->mutex
);
3590 CONFIGFS_ATTR(srpt_tpg_
, enable
);
3592 static struct configfs_attribute
*srpt_tpg_attrs
[] = {
3593 &srpt_tpg_attr_enable
,
3598 * srpt_make_tpg - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port/$tpg
3599 * @wwn: Corresponds to $driver/$port.
3603 static struct se_portal_group
*srpt_make_tpg(struct se_wwn
*wwn
,
3604 struct config_group
*group
,
3607 struct srpt_port
*sport
= wwn
->priv
;
3608 static struct se_portal_group
*tpg
;
3611 WARN_ON_ONCE(wwn
!= &sport
->port_guid_wwn
&&
3612 wwn
!= &sport
->port_gid_wwn
);
3613 tpg
= wwn
== &sport
->port_guid_wwn
? &sport
->port_guid_tpg
:
3614 &sport
->port_gid_tpg
;
3615 res
= core_tpg_register(wwn
, tpg
, SCSI_PROTOCOL_SRP
);
3617 return ERR_PTR(res
);
3623 * srpt_drop_tpg - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port/$tpg
3624 * @tpg: Target portal group to deregister.
3626 static void srpt_drop_tpg(struct se_portal_group
*tpg
)
3628 struct srpt_port
*sport
= srpt_tpg_to_sport(tpg
);
3630 sport
->enabled
= false;
3631 core_tpg_deregister(tpg
);
3635 * srpt_make_tport - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port
3640 static struct se_wwn
*srpt_make_tport(struct target_fabric_configfs
*tf
,
3641 struct config_group
*group
,
3644 return srpt_lookup_wwn(name
) ? : ERR_PTR(-EINVAL
);
3648 * srpt_drop_tport - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port
3651 static void srpt_drop_tport(struct se_wwn
*wwn
)
3655 static ssize_t
srpt_wwn_version_show(struct config_item
*item
, char *buf
)
3657 return scnprintf(buf
, PAGE_SIZE
, "%s\n", DRV_VERSION
);
3660 CONFIGFS_ATTR_RO(srpt_wwn_
, version
);
3662 static struct configfs_attribute
*srpt_wwn_attrs
[] = {
3663 &srpt_wwn_attr_version
,
3667 static const struct target_core_fabric_ops srpt_template
= {
3668 .module
= THIS_MODULE
,
3670 .get_fabric_name
= srpt_get_fabric_name
,
3671 .tpg_get_wwn
= srpt_get_fabric_wwn
,
3672 .tpg_get_tag
= srpt_get_tag
,
3673 .tpg_check_demo_mode
= srpt_check_false
,
3674 .tpg_check_demo_mode_cache
= srpt_check_true
,
3675 .tpg_check_demo_mode_write_protect
= srpt_check_true
,
3676 .tpg_check_prod_mode_write_protect
= srpt_check_false
,
3677 .tpg_get_inst_index
= srpt_tpg_get_inst_index
,
3678 .release_cmd
= srpt_release_cmd
,
3679 .check_stop_free
= srpt_check_stop_free
,
3680 .close_session
= srpt_close_session
,
3681 .sess_get_index
= srpt_sess_get_index
,
3682 .sess_get_initiator_sid
= NULL
,
3683 .write_pending
= srpt_write_pending
,
3684 .write_pending_status
= srpt_write_pending_status
,
3685 .set_default_node_attributes
= srpt_set_default_node_attrs
,
3686 .get_cmd_state
= srpt_get_tcm_cmd_state
,
3687 .queue_data_in
= srpt_queue_data_in
,
3688 .queue_status
= srpt_queue_status
,
3689 .queue_tm_rsp
= srpt_queue_tm_rsp
,
3690 .aborted_task
= srpt_aborted_task
,
3692 * Setup function pointers for generic logic in
3693 * target_core_fabric_configfs.c
3695 .fabric_make_wwn
= srpt_make_tport
,
3696 .fabric_drop_wwn
= srpt_drop_tport
,
3697 .fabric_make_tpg
= srpt_make_tpg
,
3698 .fabric_drop_tpg
= srpt_drop_tpg
,
3699 .fabric_init_nodeacl
= srpt_init_nodeacl
,
3701 .tfc_discovery_attrs
= srpt_da_attrs
,
3702 .tfc_wwn_attrs
= srpt_wwn_attrs
,
3703 .tfc_tpg_base_attrs
= srpt_tpg_attrs
,
3704 .tfc_tpg_attrib_attrs
= srpt_tpg_attrib_attrs
,
3708 * srpt_init_module - kernel module initialization
3710 * Note: Since ib_register_client() registers callback functions, and since at
3711 * least one of these callback functions (srpt_add_one()) calls target core
3712 * functions, this driver must be registered with the target core before
3713 * ib_register_client() is called.
3715 static int __init
srpt_init_module(void)
3720 if (srp_max_req_size
< MIN_MAX_REQ_SIZE
) {
3721 pr_err("invalid value %d for kernel module parameter"
3722 " srp_max_req_size -- must be at least %d.\n",
3723 srp_max_req_size
, MIN_MAX_REQ_SIZE
);
3727 if (srpt_srq_size
< MIN_SRPT_SRQ_SIZE
3728 || srpt_srq_size
> MAX_SRPT_SRQ_SIZE
) {
3729 pr_err("invalid value %d for kernel module parameter"
3730 " srpt_srq_size -- must be in the range [%d..%d].\n",
3731 srpt_srq_size
, MIN_SRPT_SRQ_SIZE
, MAX_SRPT_SRQ_SIZE
);
3735 ret
= target_register_template(&srpt_template
);
3739 ret
= ib_register_client(&srpt_client
);
3741 pr_err("couldn't register IB client\n");
3742 goto out_unregister_target
;
3747 out_unregister_target
:
3748 target_unregister_template(&srpt_template
);
3753 static void __exit
srpt_cleanup_module(void)
3756 rdma_destroy_id(rdma_cm_id
);
3757 ib_unregister_client(&srpt_client
);
3758 target_unregister_template(&srpt_template
);
3761 module_init(srpt_init_module
);
3762 module_exit(srpt_cleanup_module
);