2 * Copyright (c) 2010 Cisco Systems, Inc.
4 * Portions based on tcm_loop_fabric_scsi.c and libfc/fc_fcp.c
6 * Copyright (c) 2007 Intel Corporation. All rights reserved.
7 * Copyright (c) 2008 Red Hat, Inc. All rights reserved.
8 * Copyright (c) 2008 Mike Christie
9 * Copyright (c) 2009 Rising Tide, Inc.
10 * Copyright (c) 2009 Linux-iSCSI.org
11 * Copyright (c) 2009 Nicholas A. Bellinger <nab@linux-iscsi.org>
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms and conditions of the GNU General Public License,
15 * version 2, as published by the Free Software Foundation.
17 * This program is distributed in the hope it will be useful, but WITHOUT
18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
22 * You should have received a copy of the GNU General Public License along with
23 * this program; if not, write to the Free Software Foundation, Inc.,
24 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
27 /* XXX TBD some includes may be extraneous */
29 #include <linux/module.h>
30 #include <linux/moduleparam.h>
31 #include <generated/utsrelease.h>
32 #include <linux/utsname.h>
33 #include <linux/init.h>
34 #include <linux/slab.h>
35 #include <linux/kthread.h>
36 #include <linux/types.h>
37 #include <linux/string.h>
38 #include <linux/configfs.h>
39 #include <linux/ctype.h>
40 #include <linux/hash.h>
41 #include <linux/ratelimit.h>
42 #include <asm/unaligned.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_host.h>
45 #include <scsi/scsi_device.h>
46 #include <scsi/scsi_cmnd.h>
47 #include <scsi/libfc.h>
48 #include <scsi/fc_encode.h>
50 #include <target/target_core_base.h>
51 #include <target/target_core_fabric.h>
52 #include <target/target_core_configfs.h>
53 #include <target/configfs_macros.h>
58 * Deliver read data back to initiator.
59 * XXX TBD handle resource problems later.
61 int ft_queue_data_in(struct se_cmd
*se_cmd
)
63 struct ft_cmd
*cmd
= container_of(se_cmd
, struct ft_cmd
, se_cmd
);
64 struct fc_frame
*fp
= NULL
;
66 struct fc_lport
*lport
;
67 struct scatterlist
*sg
= NULL
;
69 u32 f_ctl
= FC_FC_EX_CTX
| FC_FC_REL_OFF
;
77 struct page
*page
= NULL
;
86 ep
= fc_seq_exch(cmd
->seq
);
88 cmd
->seq
= lport
->tt
.seq_start_next(cmd
->seq
);
90 remaining
= se_cmd
->data_length
;
93 * Setup to use first mem list entry, unless no data.
95 BUG_ON(remaining
&& !se_cmd
->t_data_sg
);
97 sg
= se_cmd
->t_data_sg
;
103 /* no scatter/gather in skb for odd word length due to fc_seq_send() */
104 use_sg
= !(remaining
% 4);
109 mem_len
= min((size_t)sg
->length
, remaining
);
110 mem_off
= sg
->offset
;
115 * If lport's has capability of Large Send Offload LSO)
116 * , then allow 'frame_len' to be as big as 'lso_max'
117 * if indicated transfer length is >= lport->lso_max
119 frame_len
= (lport
->seq_offload
) ? lport
->lso_max
:
120 cmd
->sess
->max_frame
;
121 frame_len
= min(frame_len
, remaining
);
122 fp
= fc_frame_alloc(lport
, use_sg
? 0 : frame_len
);
125 to
= fc_frame_payload_get(fp
, 0);
127 frame_off
+= frame_len
;
129 * Setup the frame's max payload which is used by base
130 * driver to indicate HW about max frame size, so that
131 * HW can do fragmentation appropriately based on
132 * "gso_max_size" of underline netdev.
134 fr_max_payload(fp
) = cmd
->sess
->max_frame
;
136 tlen
= min(mem_len
, frame_len
);
139 off_in_page
= mem_off
;
142 skb_fill_page_desc(fp_skb(fp
),
143 skb_shinfo(fp_skb(fp
))->nr_frags
,
144 page
, off_in_page
, tlen
);
146 fp_skb(fp
)->data_len
+= tlen
;
147 fp_skb(fp
)->truesize
+=
148 PAGE_SIZE
<< compound_order(page
);
151 from
= kmap_atomic(page
+ (mem_off
>> PAGE_SHIFT
));
153 from
+= mem_off
& ~PAGE_MASK
;
154 tlen
= min(tlen
, (size_t)(PAGE_SIZE
-
155 (mem_off
& ~PAGE_MASK
)));
156 memcpy(to
, from
, tlen
);
157 kunmap_atomic(page_addr
);
167 (skb_shinfo(fp_skb(fp
))->nr_frags
< FC_FRAME_SG_LEN
))
170 f_ctl
|= FC_FC_END_SEQ
;
171 fc_fill_fc_hdr(fp
, FC_RCTL_DD_SOL_DATA
, ep
->did
, ep
->sid
,
172 FC_TYPE_FCP
, f_ctl
, fh_off
);
173 error
= lport
->tt
.seq_send(lport
, cmd
->seq
, fp
);
175 /* XXX For now, initiator will retry */
176 pr_err_ratelimited("%s: Failed to send frame %p, "
177 "xid <0x%x>, remaining %zu, "
179 __func__
, fp
, ep
->xid
,
180 remaining
, lport
->lso_max
);
183 return ft_queue_status(se_cmd
);
186 static void ft_execute_work(struct work_struct
*work
)
188 struct ft_cmd
*cmd
= container_of(work
, struct ft_cmd
, work
);
190 target_execute_cmd(&cmd
->se_cmd
);
194 * Receive write data frame.
196 void ft_recv_write_data(struct ft_cmd
*cmd
, struct fc_frame
*fp
)
198 struct se_cmd
*se_cmd
= &cmd
->se_cmd
;
199 struct fc_seq
*seq
= cmd
->seq
;
201 struct fc_lport
*lport
;
202 struct fc_frame_header
*fh
;
203 struct scatterlist
*sg
= NULL
;
209 struct page
*page
= NULL
;
216 fh
= fc_frame_header_get(fp
);
217 if (!(ntoh24(fh
->fh_f_ctl
) & FC_FC_REL_OFF
))
220 f_ctl
= ntoh24(fh
->fh_f_ctl
);
221 ep
= fc_seq_exch(seq
);
223 if (cmd
->was_ddp_setup
) {
227 * Since DDP (Large Rx offload) was setup for this request,
228 * payload is expected to be copied directly to user buffers.
230 buf
= fc_frame_payload_get(fp
, 1);
232 pr_err("%s: xid 0x%x, f_ctl 0x%x, cmd->sg %p, "
233 "cmd->sg_cnt 0x%x. DDP was setup"
234 " hence not expected to receive frame with "
235 "payload, Frame will be dropped if"
236 "'Sequence Initiative' bit in f_ctl is"
237 "not set\n", __func__
, ep
->xid
, f_ctl
,
238 se_cmd
->t_data_sg
, se_cmd
->t_data_nents
);
240 * Invalidate HW DDP context if it was setup for respective
241 * command. Invalidation of HW DDP context is requited in both
242 * situation (success and error).
244 ft_invl_hw_context(cmd
);
247 * If "Sequence Initiative (TSI)" bit set in f_ctl, means last
248 * write data frame is received successfully where payload is
249 * posted directly to user buffer and only the last frame's
250 * header is posted in receive queue.
252 * If "Sequence Initiative (TSI)" bit is not set, means error
253 * condition w.r.t. DDP, hence drop the packet and let explict
254 * ABORTS from other end of exchange timer trigger the recovery.
256 if (f_ctl
& FC_FC_SEQ_INIT
)
262 rel_off
= ntohl(fh
->fh_parm_offset
);
263 frame_len
= fr_len(fp
);
264 if (frame_len
<= sizeof(*fh
))
266 frame_len
-= sizeof(*fh
);
267 from
= fc_frame_payload_get(fp
, 0);
268 if (rel_off
>= se_cmd
->data_length
)
270 if (frame_len
+ rel_off
> se_cmd
->data_length
)
271 frame_len
= se_cmd
->data_length
- rel_off
;
274 * Setup to use first mem list entry, unless no data.
276 BUG_ON(frame_len
&& !se_cmd
->t_data_sg
);
278 sg
= se_cmd
->t_data_sg
;
279 mem_len
= sg
->length
;
280 mem_off
= sg
->offset
;
287 mem_len
= sg
->length
;
288 mem_off
= sg
->offset
;
291 if (rel_off
>= mem_len
) {
300 tlen
= min(mem_len
, frame_len
);
302 to
= kmap_atomic(page
+ (mem_off
>> PAGE_SHIFT
));
304 to
+= mem_off
& ~PAGE_MASK
;
305 tlen
= min(tlen
, (size_t)(PAGE_SIZE
-
306 (mem_off
& ~PAGE_MASK
)));
307 memcpy(to
, from
, tlen
);
308 kunmap_atomic(page_addr
);
314 cmd
->write_data_len
+= tlen
;
317 if (cmd
->write_data_len
== se_cmd
->data_length
) {
318 INIT_WORK(&cmd
->work
, ft_execute_work
);
319 queue_work(cmd
->sess
->tport
->tpg
->workqueue
, &cmd
->work
);
326 * Handle and cleanup any HW specific resources if
327 * received ABORTS, errors, timeouts.
329 void ft_invl_hw_context(struct ft_cmd
*cmd
)
331 struct fc_seq
*seq
= cmd
->seq
;
332 struct fc_exch
*ep
= NULL
;
333 struct fc_lport
*lport
= NULL
;
337 /* Cleanup the DDP context in HW if DDP was setup */
338 if (cmd
->was_ddp_setup
&& seq
) {
339 ep
= fc_seq_exch(seq
);
342 if (lport
&& (ep
->xid
<= lport
->lro_xid
))
344 * "ddp_done" trigger invalidation of HW
345 * specific DDP context
347 cmd
->write_data_len
= lport
->tt
.ddp_done(lport
,
351 * Resetting same variable to indicate HW's
352 * DDP context has been invalidated to avoid
353 * re_invalidation of same context (context is
354 * identified using ep->xid)
356 cmd
->was_ddp_setup
= 0;
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