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Kiran Patil3699d922011-04-18 16:24:14 -07001/*
2 * Copyright (c) 2010 Cisco Systems, Inc.
3 *
4 * Portions based on tcm_loop_fabric_scsi.c and libfc/fc_fcp.c
5 *
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>
12 *
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.
16 *
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
20 * more details.
21 *
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.
25 */
26
27/* XXX TBD some includes may be extraneous */
28
29#include <linux/module.h>
30#include <linux/moduleparam.h>
Kiran Patil3699d922011-04-18 16:24:14 -070031#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>
Andy Grover6708bb22011-06-08 10:36:43 -070041#include <linux/ratelimit.h>
Kiran Patil3699d922011-04-18 16:24:14 -070042#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>
49
50#include <target/target_core_base.h>
51#include <target/target_core_transport.h>
52#include <target/target_core_fabric_ops.h>
53#include <target/target_core_device.h>
54#include <target/target_core_tpg.h>
55#include <target/target_core_configfs.h>
Kiran Patil3699d922011-04-18 16:24:14 -070056#include <target/configfs_macros.h>
57
58#include "tcm_fc.h"
59
60/*
61 * Deliver read data back to initiator.
62 * XXX TBD handle resource problems later.
63 */
64int ft_queue_data_in(struct se_cmd *se_cmd)
65{
66 struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
Kiran Patil3699d922011-04-18 16:24:14 -070067 struct fc_frame *fp = NULL;
68 struct fc_exch *ep;
69 struct fc_lport *lport;
Andy Groverec98f782011-07-20 19:28:46 +000070 struct scatterlist *sg = NULL;
Kiran Patil3699d922011-04-18 16:24:14 -070071 size_t remaining;
72 u32 f_ctl = FC_FC_EX_CTX | FC_FC_REL_OFF;
Andy Groverec98f782011-07-20 19:28:46 +000073 u32 mem_off = 0;
Kiran Patil3699d922011-04-18 16:24:14 -070074 u32 fh_off = 0;
75 u32 frame_off = 0;
76 size_t frame_len = 0;
Andy Groverec98f782011-07-20 19:28:46 +000077 size_t mem_len = 0;
Kiran Patil3699d922011-04-18 16:24:14 -070078 size_t tlen;
79 size_t off_in_page;
Andy Groverec98f782011-07-20 19:28:46 +000080 struct page *page = NULL;
Kiran Patil3699d922011-04-18 16:24:14 -070081 int use_sg;
82 int error;
83 void *page_addr;
84 void *from;
85 void *to = NULL;
86
87 ep = fc_seq_exch(cmd->seq);
88 lport = ep->lp;
89 cmd->seq = lport->tt.seq_start_next(cmd->seq);
90
Kiran Patil3699d922011-04-18 16:24:14 -070091 remaining = se_cmd->data_length;
92
93 /*
Andy Grover05d1c7c2011-07-20 19:13:28 +000094 * Setup to use first mem list entry, unless no data.
Kiran Patil3699d922011-04-18 16:24:14 -070095 */
Andy Groverec98f782011-07-20 19:28:46 +000096 BUG_ON(remaining && !se_cmd->t_data_sg);
Andy Grover05d1c7c2011-07-20 19:13:28 +000097 if (remaining) {
Andy Groverec98f782011-07-20 19:28:46 +000098 sg = se_cmd->t_data_sg;
99 mem_len = sg->length;
100 mem_off = sg->offset;
101 page = sg_page(sg);
Kiran Patil3699d922011-04-18 16:24:14 -0700102 }
103
104 /* no scatter/gather in skb for odd word length due to fc_seq_send() */
105 use_sg = !(remaining % 4);
106
107 while (remaining) {
108 if (!mem_len) {
Andy Groverec98f782011-07-20 19:28:46 +0000109 sg = sg_next(sg);
110 mem_len = min((size_t)sg->length, remaining);
111 mem_off = sg->offset;
112 page = sg_page(sg);
Kiran Patil3699d922011-04-18 16:24:14 -0700113 }
114 if (!frame_len) {
115 /*
116 * If lport's has capability of Large Send Offload LSO)
117 * , then allow 'frame_len' to be as big as 'lso_max'
118 * if indicated transfer length is >= lport->lso_max
119 */
120 frame_len = (lport->seq_offload) ? lport->lso_max :
121 cmd->sess->max_frame;
122 frame_len = min(frame_len, remaining);
123 fp = fc_frame_alloc(lport, use_sg ? 0 : frame_len);
124 if (!fp)
125 return -ENOMEM;
126 to = fc_frame_payload_get(fp, 0);
127 fh_off = frame_off;
128 frame_off += frame_len;
129 /*
130 * Setup the frame's max payload which is used by base
131 * driver to indicate HW about max frame size, so that
132 * HW can do fragmentation appropriately based on
133 * "gso_max_size" of underline netdev.
134 */
135 fr_max_payload(fp) = cmd->sess->max_frame;
136 }
137 tlen = min(mem_len, frame_len);
138
139 if (use_sg) {
Andy Grover05d1c7c2011-07-20 19:13:28 +0000140 off_in_page = mem_off;
Kiran Patil3699d922011-04-18 16:24:14 -0700141 BUG_ON(!page);
142 get_page(page);
143 skb_fill_page_desc(fp_skb(fp),
144 skb_shinfo(fp_skb(fp))->nr_frags,
145 page, off_in_page, tlen);
146 fr_len(fp) += tlen;
147 fp_skb(fp)->data_len += tlen;
148 fp_skb(fp)->truesize +=
149 PAGE_SIZE << compound_order(page);
Andy Grover05d1c7c2011-07-20 19:13:28 +0000150 } else {
Kiran Patil3699d922011-04-18 16:24:14 -0700151 BUG_ON(!page);
152 from = kmap_atomic(page + (mem_off >> PAGE_SHIFT),
153 KM_SOFTIRQ0);
154 page_addr = from;
155 from += mem_off & ~PAGE_MASK;
156 tlen = min(tlen, (size_t)(PAGE_SIZE -
157 (mem_off & ~PAGE_MASK)));
158 memcpy(to, from, tlen);
159 kunmap_atomic(page_addr, KM_SOFTIRQ0);
160 to += tlen;
Kiran Patil3699d922011-04-18 16:24:14 -0700161 }
162
163 mem_off += tlen;
164 mem_len -= tlen;
165 frame_len -= tlen;
166 remaining -= tlen;
167
168 if (frame_len &&
169 (skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN))
170 continue;
171 if (!remaining)
172 f_ctl |= FC_FC_END_SEQ;
173 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
174 FC_TYPE_FCP, f_ctl, fh_off);
175 error = lport->tt.seq_send(lport, cmd->seq, fp);
176 if (error) {
177 /* XXX For now, initiator will retry */
Andy Grover6708bb22011-06-08 10:36:43 -0700178 pr_err_ratelimited("%s: Failed to send frame %p, "
Nicholas Bellinger95efa282011-06-23 23:28:46 +0000179 "xid <0x%x>, remaining %zu, "
Kiran Patil3699d922011-04-18 16:24:14 -0700180 "lso_max <0x%x>\n",
181 __func__, fp, ep->xid,
182 remaining, lport->lso_max);
183 }
184 }
185 return ft_queue_status(se_cmd);
186}
187
188/*
189 * Receive write data frame.
190 */
191void ft_recv_write_data(struct ft_cmd *cmd, struct fc_frame *fp)
192{
193 struct se_cmd *se_cmd = &cmd->se_cmd;
194 struct fc_seq *seq = cmd->seq;
195 struct fc_exch *ep;
196 struct fc_lport *lport;
Kiran Patil3699d922011-04-18 16:24:14 -0700197 struct fc_frame_header *fh;
Andy Groverec98f782011-07-20 19:28:46 +0000198 struct scatterlist *sg = NULL;
199 u32 mem_off = 0;
Kiran Patil3699d922011-04-18 16:24:14 -0700200 u32 rel_off;
201 size_t frame_len;
Andy Groverec98f782011-07-20 19:28:46 +0000202 size_t mem_len = 0;
Kiran Patil3699d922011-04-18 16:24:14 -0700203 size_t tlen;
Andy Groverec98f782011-07-20 19:28:46 +0000204 struct page *page = NULL;
Kiran Patil3699d922011-04-18 16:24:14 -0700205 void *page_addr;
206 void *from;
207 void *to;
208 u32 f_ctl;
209 void *buf;
210
Kiran Patil3699d922011-04-18 16:24:14 -0700211 fh = fc_frame_header_get(fp);
212 if (!(ntoh24(fh->fh_f_ctl) & FC_FC_REL_OFF))
213 goto drop;
214
Kiran Patildcd998c2011-08-03 09:20:01 +0000215 f_ctl = ntoh24(fh->fh_f_ctl);
216 ep = fc_seq_exch(seq);
217 lport = ep->lp;
218 if (cmd->was_ddp_setup) {
219 BUG_ON(!ep);
220 BUG_ON(!lport);
Kiran Patil079587b2011-08-26 09:25:25 -0700221 /*
222 * Since DDP (Large Rx offload) was setup for this request,
223 * payload is expected to be copied directly to user buffers.
224 */
225 buf = fc_frame_payload_get(fp, 1);
226 if (buf)
227 pr_err("%s: xid 0x%x, f_ctl 0x%x, cmd->sg %p, "
Kiran Patildcd998c2011-08-03 09:20:01 +0000228 "cmd->sg_cnt 0x%x. DDP was setup"
229 " hence not expected to receive frame with "
Kiran Patil079587b2011-08-26 09:25:25 -0700230 "payload, Frame will be dropped if"
231 "'Sequence Initiative' bit in f_ctl is"
Kiran Patildcd998c2011-08-03 09:20:01 +0000232 "not set\n", __func__, ep->xid, f_ctl,
233 cmd->sg, cmd->sg_cnt);
Kiran Patil079587b2011-08-26 09:25:25 -0700234 /*
235 * Invalidate HW DDP context if it was setup for respective
236 * command. Invalidation of HW DDP context is requited in both
237 * situation (success and error).
238 */
239 ft_invl_hw_context(cmd);
Kiran Patildcd998c2011-08-03 09:20:01 +0000240
Kiran Patil079587b2011-08-26 09:25:25 -0700241 /*
242 * If "Sequence Initiative (TSI)" bit set in f_ctl, means last
243 * write data frame is received successfully where payload is
244 * posted directly to user buffer and only the last frame's
245 * header is posted in receive queue.
246 *
247 * If "Sequence Initiative (TSI)" bit is not set, means error
248 * condition w.r.t. DDP, hence drop the packet and let explict
249 * ABORTS from other end of exchange timer trigger the recovery.
250 */
251 if (f_ctl & FC_FC_SEQ_INIT)
252 goto last_frame;
253 else
254 goto drop;
255 }
Kiran Patil3699d922011-04-18 16:24:14 -0700256
257 rel_off = ntohl(fh->fh_parm_offset);
258 frame_len = fr_len(fp);
259 if (frame_len <= sizeof(*fh))
260 goto drop;
261 frame_len -= sizeof(*fh);
262 from = fc_frame_payload_get(fp, 0);
263 if (rel_off >= se_cmd->data_length)
264 goto drop;
265 if (frame_len + rel_off > se_cmd->data_length)
266 frame_len = se_cmd->data_length - rel_off;
267
268 /*
Andy Grover05d1c7c2011-07-20 19:13:28 +0000269 * Setup to use first mem list entry, unless no data.
Kiran Patil3699d922011-04-18 16:24:14 -0700270 */
Andy Groverec98f782011-07-20 19:28:46 +0000271 BUG_ON(frame_len && !se_cmd->t_data_sg);
Andy Grover05d1c7c2011-07-20 19:13:28 +0000272 if (frame_len) {
Andy Groverec98f782011-07-20 19:28:46 +0000273 sg = se_cmd->t_data_sg;
274 mem_len = sg->length;
275 mem_off = sg->offset;
276 page = sg_page(sg);
Kiran Patil3699d922011-04-18 16:24:14 -0700277 }
278
279 while (frame_len) {
280 if (!mem_len) {
Andy Groverec98f782011-07-20 19:28:46 +0000281 sg = sg_next(sg);
282 mem_len = sg->length;
283 mem_off = sg->offset;
284 page = sg_page(sg);
Kiran Patil3699d922011-04-18 16:24:14 -0700285 }
286 if (rel_off >= mem_len) {
287 rel_off -= mem_len;
288 mem_len = 0;
289 continue;
290 }
291 mem_off += rel_off;
292 mem_len -= rel_off;
293 rel_off = 0;
294
295 tlen = min(mem_len, frame_len);
296
Andy Grover05d1c7c2011-07-20 19:13:28 +0000297 to = kmap_atomic(page + (mem_off >> PAGE_SHIFT),
298 KM_SOFTIRQ0);
299 page_addr = to;
300 to += mem_off & ~PAGE_MASK;
301 tlen = min(tlen, (size_t)(PAGE_SIZE -
302 (mem_off & ~PAGE_MASK)));
303 memcpy(to, from, tlen);
304 kunmap_atomic(page_addr, KM_SOFTIRQ0);
305
Kiran Patil3699d922011-04-18 16:24:14 -0700306 from += tlen;
307 frame_len -= tlen;
308 mem_off += tlen;
309 mem_len -= tlen;
310 cmd->write_data_len += tlen;
311 }
312last_frame:
313 if (cmd->write_data_len == se_cmd->data_length)
314 transport_generic_handle_data(se_cmd);
315drop:
316 fc_frame_free(fp);
317}
Kiran Patildcd998c2011-08-03 09:20:01 +0000318
319/*
320 * Handle and cleanup any HW specific resources if
321 * received ABORTS, errors, timeouts.
322 */
323void ft_invl_hw_context(struct ft_cmd *cmd)
324{
325 struct fc_seq *seq = cmd->seq;
326 struct fc_exch *ep = NULL;
327 struct fc_lport *lport = NULL;
328
329 BUG_ON(!cmd);
330
331 /* Cleanup the DDP context in HW if DDP was setup */
332 if (cmd->was_ddp_setup && seq) {
333 ep = fc_seq_exch(seq);
334 if (ep) {
335 lport = ep->lp;
336 if (lport && (ep->xid <= lport->lro_xid))
337 /*
338 * "ddp_done" trigger invalidation of HW
339 * specific DDP context
340 */
341 cmd->write_data_len = lport->tt.ddp_done(lport,
342 ep->xid);
343
344 /*
345 * Resetting same variable to indicate HW's
346 * DDP context has been invalidated to avoid
347 * re_invalidation of same context (context is
348 * identified using ep->xid)
349 */
350 cmd->was_ddp_setup = 0;
351 }
352 }
353}