1
2
3
4
5
6
7
8#ifndef _FC_FRAME_H_
9#define _FC_FRAME_H_
10
11#include <linux/scatterlist.h>
12#include <linux/skbuff.h>
13#include <scsi/scsi_cmnd.h>
14
15#include <scsi/fc/fc_fs.h>
16#include <scsi/fc/fc_fcp.h>
17#include <scsi/fc/fc_encaps.h>
18
19#include <linux/if_ether.h>
20
21
22
23#define ntohll(x) be64_to_cpu(x)
24#define htonll(x) cpu_to_be64(x)
25
26static inline u32 ntoh24(const u8 *p)
27{
28 return (p[0] << 16) | (p[1] << 8) | p[2];
29}
30
31static inline void hton24(u8 *p, u32 v)
32{
33 p[0] = (v >> 16) & 0xff;
34 p[1] = (v >> 8) & 0xff;
35 p[2] = v & 0xff;
36}
37
38
39
40
41
42
43
44#define FC_FRAME_HEADROOM 32
45#define FC_FRAME_TAILROOM 8
46
47
48#define FC_FRAME_SG_LEN (MAX_SKB_FRAGS - 1)
49
50#define fp_skb(fp) (&((fp)->skb))
51#define fr_hdr(fp) ((fp)->skb.data)
52#define fr_len(fp) ((fp)->skb.len)
53#define fr_cb(fp) ((struct fcoe_rcv_info *)&((fp)->skb.cb[0]))
54#define fr_dev(fp) (fr_cb(fp)->fr_dev)
55#define fr_seq(fp) (fr_cb(fp)->fr_seq)
56#define fr_sof(fp) (fr_cb(fp)->fr_sof)
57#define fr_eof(fp) (fr_cb(fp)->fr_eof)
58#define fr_flags(fp) (fr_cb(fp)->fr_flags)
59#define fr_encaps(fp) (fr_cb(fp)->fr_encaps)
60#define fr_max_payload(fp) (fr_cb(fp)->fr_max_payload)
61#define fr_fsp(fp) (fr_cb(fp)->fr_fsp)
62#define fr_crc(fp) (fr_cb(fp)->fr_crc)
63
64struct fc_frame {
65 struct sk_buff skb;
66};
67
68struct fcoe_rcv_info {
69 struct fc_lport *fr_dev;
70 struct fc_seq *fr_seq;
71 struct fc_fcp_pkt *fr_fsp;
72 u32 fr_crc;
73 u16 fr_max_payload;
74 u8 fr_sof;
75 u8 fr_eof;
76 u8 fr_flags;
77 u8 fr_encaps;
78 u8 granted_mac[ETH_ALEN];
79};
80
81
82
83
84
85static inline struct fcoe_rcv_info *fcoe_dev_from_skb(const struct sk_buff *skb)
86{
87 BUILD_BUG_ON(sizeof(struct fcoe_rcv_info) > sizeof(skb->cb));
88 return (struct fcoe_rcv_info *) skb->cb;
89}
90
91
92
93
94#define FCPHF_CRC_UNCHECKED 0x01
95
96
97
98
99
100
101static inline void fc_frame_init(struct fc_frame *fp)
102{
103 fr_dev(fp) = NULL;
104 fr_seq(fp) = NULL;
105 fr_flags(fp) = 0;
106 fr_encaps(fp) = 0;
107}
108
109struct fc_frame *fc_frame_alloc_fill(struct fc_lport *, size_t payload_len);
110struct fc_frame *_fc_frame_alloc(size_t payload_len);
111
112
113
114
115
116static inline struct fc_frame *fc_frame_alloc(struct fc_lport *dev, size_t len)
117{
118 struct fc_frame *fp;
119
120
121
122
123
124 if (len && len % 4)
125 fp = fc_frame_alloc_fill(dev, len);
126 else
127 fp = _fc_frame_alloc(len);
128 return fp;
129}
130
131
132
133
134static inline void fc_frame_free(struct fc_frame *fp)
135{
136 kfree_skb(fp_skb(fp));
137}
138
139static inline int fc_frame_is_linear(struct fc_frame *fp)
140{
141 return !skb_is_nonlinear(fp_skb(fp));
142}
143
144
145
146
147
148static inline
149struct fc_frame_header *__fc_frame_header_get(const struct fc_frame *fp)
150{
151 return (struct fc_frame_header *)fr_hdr(fp);
152}
153
154
155
156
157
158static inline
159struct fc_frame_header *fc_frame_header_get(const struct fc_frame *fp)
160{
161 WARN_ON(fr_len(fp) < sizeof(struct fc_frame_header));
162 return __fc_frame_header_get(fp);
163}
164
165
166
167
168static inline u32 fc_frame_sid(const struct fc_frame *fp)
169{
170 return ntoh24(__fc_frame_header_get(fp)->fh_s_id);
171}
172
173
174
175
176static inline u32 fc_frame_did(const struct fc_frame *fp)
177{
178 return ntoh24(__fc_frame_header_get(fp)->fh_d_id);
179}
180
181
182
183
184
185
186
187
188
189
190
191static inline void *fc_frame_payload_get(const struct fc_frame *fp,
192 size_t len)
193{
194 void *pp = NULL;
195
196 if (fr_len(fp) >= sizeof(struct fc_frame_header) + len)
197 pp = fc_frame_header_get(fp) + 1;
198 return pp;
199}
200
201
202
203
204
205
206static inline u8 fc_frame_payload_op(const struct fc_frame *fp)
207{
208 u8 *cp;
209
210 cp = fc_frame_payload_get(fp, sizeof(u8));
211 if (!cp)
212 return 0;
213 return *cp;
214
215}
216
217
218
219
220static inline enum fc_class fc_frame_class(const struct fc_frame *fp)
221{
222 return fc_sof_class(fr_sof(fp));
223}
224
225
226
227
228
229
230u32 fc_frame_crc_check(struct fc_frame *);
231
232static inline u8 fc_frame_rctl(const struct fc_frame *fp)
233{
234 return fc_frame_header_get(fp)->fh_r_ctl;
235}
236
237static inline bool fc_frame_is_cmd(const struct fc_frame *fp)
238{
239 return fc_frame_rctl(fp) == FC_RCTL_DD_UNSOL_CMD;
240}
241
242
243
244
245
246
247void fc_frame_leak_check(void);
248
249static inline void __fc_fill_fc_hdr(struct fc_frame_header *fh,
250 enum fc_rctl r_ctl,
251 u32 did, u32 sid, enum fc_fh_type type,
252 u32 f_ctl, u32 parm_offset)
253{
254 WARN_ON(r_ctl == 0);
255 fh->fh_r_ctl = r_ctl;
256 hton24(fh->fh_d_id, did);
257 hton24(fh->fh_s_id, sid);
258 fh->fh_type = type;
259 hton24(fh->fh_f_ctl, f_ctl);
260 fh->fh_cs_ctl = 0;
261 fh->fh_df_ctl = 0;
262 fh->fh_parm_offset = htonl(parm_offset);
263}
264
265
266
267
268static inline void fc_fill_fc_hdr(struct fc_frame *fp, enum fc_rctl r_ctl,
269 u32 did, u32 sid, enum fc_fh_type type,
270 u32 f_ctl, u32 parm_offset)
271{
272 struct fc_frame_header *fh;
273
274 fh = fc_frame_header_get(fp);
275 __fc_fill_fc_hdr(fh, r_ctl, did, sid, type, f_ctl, parm_offset);
276}
277
278
279#endif
280