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1 | /* |
2 | * Copyright(c) 2007 Intel Corporation. All rights reserved. |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify it |
5 | * under the terms and conditions of the GNU General Public License, |
6 | * version 2, as published by the Free Software Foundation. |
7 | * |
8 | * This program is distributed in the hope it will be useful, but WITHOUT |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
11 | * more details. |
12 | * |
13 | * You should have received a copy of the GNU General Public License along with |
14 | * this program; if not, write to the Free Software Foundation, Inc., |
15 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
16 | * |
17 | * Maintained at www.Open-FCoE.org |
18 | */ |
19 | |
20 | #ifndef _FC_FRAME_H_ |
21 | #define _FC_FRAME_H_ |
22 | |
23 | #include <linux/scatterlist.h> |
24 | #include <linux/skbuff.h> |
25 | #include <scsi/scsi_cmnd.h> |
26 | |
27 | #include <scsi/fc/fc_fs.h> |
28 | #include <scsi/fc/fc_fcp.h> |
29 | #include <scsi/fc/fc_encaps.h> |
30 | |
31 | #include <linux/if_ether.h> |
32 | |
33 | /* some helpful macros */ |
34 | |
35 | #define ntohll(x) be64_to_cpu(x) |
36 | #define htonll(x) cpu_to_be64(x) |
37 | |
38 | static inline u32 ntoh24(const u8 *p) |
39 | { |
40 | return (p[0] << 16) | (p[1] << 8) | p[2]; |
41 | } |
42 | |
43 | static inline void hton24(u8 *p, u32 v) |
44 | { |
45 | p[0] = (v >> 16) & 0xff; |
46 | p[1] = (v >> 8) & 0xff; |
47 | p[2] = v & 0xff; |
48 | } |
49 | |
50 | /* |
51 | * The fc_frame interface is used to pass frame data between functions. |
52 | * The frame includes the data buffer, length, and SOF / EOF delimiter types. |
53 | * A pointer to the port structure of the receiving port is also includeded. |
54 | */ |
55 | |
56 | #define FC_FRAME_HEADROOM 32 /* headroom for VLAN + FCoE headers */ |
57 | #define FC_FRAME_TAILROOM 8 /* trailer space for FCoE */ |
58 | |
59 | /* Max number of skb frags allowed, reserving one for fcoe_crc_eof page */ |
60 | #define FC_FRAME_SG_LEN (MAX_SKB_FRAGS - 1) |
61 | |
62 | #define fp_skb(fp) (&((fp)->skb)) |
63 | #define fr_hdr(fp) ((fp)->skb.data) |
64 | #define fr_len(fp) ((fp)->skb.len) |
65 | #define fr_cb(fp) ((struct fcoe_rcv_info *)&((fp)->skb.cb[0])) |
66 | #define fr_dev(fp) (fr_cb(fp)->fr_dev) |
67 | #define fr_seq(fp) (fr_cb(fp)->fr_seq) |
68 | #define fr_sof(fp) (fr_cb(fp)->fr_sof) |
69 | #define fr_eof(fp) (fr_cb(fp)->fr_eof) |
70 | #define fr_flags(fp) (fr_cb(fp)->fr_flags) |
71 | #define fr_encaps(fp) (fr_cb(fp)->fr_encaps) |
72 | #define fr_max_payload(fp) (fr_cb(fp)->fr_max_payload) |
73 | #define fr_fsp(fp) (fr_cb(fp)->fr_fsp) |
74 | #define fr_crc(fp) (fr_cb(fp)->fr_crc) |
75 | |
76 | struct fc_frame { |
77 | struct sk_buff skb; |
78 | }; |
79 | |
80 | struct fcoe_rcv_info { |
81 | struct fc_lport *fr_dev; /* transport layer private pointer */ |
82 | struct fc_seq *fr_seq; /* for use with exchange manager */ |
83 | struct fc_fcp_pkt *fr_fsp; /* for the corresponding fcp I/O */ |
84 | u32 fr_crc; |
85 | u16 fr_max_payload; /* max FC payload */ |
86 | u8 fr_sof; /* start of frame delimiter */ |
87 | u8 fr_eof; /* end of frame delimiter */ |
88 | u8 fr_flags; /* flags - see below */ |
89 | u8 fr_encaps; /* LLD encapsulation info (e.g. FIP) */ |
90 | u8 granted_mac[ETH_ALEN]; /* FCoE MAC address */ |
91 | }; |
92 | |
93 | |
94 | /* |
95 | * Get fc_frame pointer for an skb that's already been imported. |
96 | */ |
97 | static inline struct fcoe_rcv_info *fcoe_dev_from_skb(const struct sk_buff *skb) |
98 | { |
99 | BUILD_BUG_ON(sizeof(struct fcoe_rcv_info) > sizeof(skb->cb)); |
100 | return (struct fcoe_rcv_info *) skb->cb; |
101 | } |
102 | |
103 | /* |
104 | * fr_flags. |
105 | */ |
106 | #define FCPHF_CRC_UNCHECKED 0x01 /* CRC not computed, still appended */ |
107 | |
108 | /* |
109 | * Initialize a frame. |
110 | * We don't do a complete memset here for performance reasons. |
111 | * The caller must set fr_free, fr_hdr, fr_len, fr_sof, and fr_eof eventually. |
112 | */ |
113 | static inline void fc_frame_init(struct fc_frame *fp) |
114 | { |
115 | fr_dev(fp) = NULL; |
116 | fr_seq(fp) = NULL; |
117 | fr_flags(fp) = 0; |
118 | fr_encaps(fp) = 0; |
119 | } |
120 | |
121 | struct fc_frame *fc_frame_alloc_fill(struct fc_lport *, size_t payload_len); |
122 | struct fc_frame *_fc_frame_alloc(size_t payload_len); |
123 | |
124 | /* |
125 | * Allocate fc_frame structure and buffer. Set the initial length to |
126 | * payload_size + sizeof (struct fc_frame_header). |
127 | */ |
128 | static inline struct fc_frame *fc_frame_alloc(struct fc_lport *dev, size_t len) |
129 | { |
130 | struct fc_frame *fp; |
131 | |
132 | /* |
133 | * Note: Since len will often be a constant multiple of 4, |
134 | * this check will usually be evaluated and eliminated at compile time. |
135 | */ |
136 | if (len && len % 4) |
137 | fp = fc_frame_alloc_fill(dev, len); |
138 | else |
139 | fp = _fc_frame_alloc(len); |
140 | return fp; |
141 | } |
142 | |
143 | /* |
144 | * Free the fc_frame structure and buffer. |
145 | */ |
146 | static inline void fc_frame_free(struct fc_frame *fp) |
147 | { |
148 | kfree_skb(fp_skb(fp)); |
149 | } |
150 | |
151 | static inline int fc_frame_is_linear(struct fc_frame *fp) |
152 | { |
153 | return !skb_is_nonlinear(fp_skb(fp)); |
154 | } |
155 | |
156 | /* |
157 | * Get frame header from message in fc_frame structure. |
158 | * This version doesn't do a length check. |
159 | */ |
160 | static inline |
161 | struct fc_frame_header *__fc_frame_header_get(const struct fc_frame *fp) |
162 | { |
163 | return (struct fc_frame_header *)fr_hdr(fp); |
164 | } |
165 | |
166 | /* |
167 | * Get frame header from message in fc_frame structure. |
168 | * This hides a cast and provides a place to add some checking. |
169 | */ |
170 | static inline |
171 | struct fc_frame_header *fc_frame_header_get(const struct fc_frame *fp) |
172 | { |
173 | WARN_ON(fr_len(fp) < sizeof(struct fc_frame_header)); |
174 | return __fc_frame_header_get(fp); |
175 | } |
176 | |
177 | /* |
178 | * Get source FC_ID (S_ID) from frame header in message. |
179 | */ |
180 | static inline u32 fc_frame_sid(const struct fc_frame *fp) |
181 | { |
182 | return ntoh24(__fc_frame_header_get(fp)->fh_s_id); |
183 | } |
184 | |
185 | /* |
186 | * Get destination FC_ID (D_ID) from frame header in message. |
187 | */ |
188 | static inline u32 fc_frame_did(const struct fc_frame *fp) |
189 | { |
190 | return ntoh24(__fc_frame_header_get(fp)->fh_d_id); |
191 | } |
192 | |
193 | /* |
194 | * Get frame payload from message in fc_frame structure. |
195 | * This hides a cast and provides a place to add some checking. |
196 | * The len parameter is the minimum length for the payload portion. |
197 | * Returns NULL if the frame is too short. |
198 | * |
199 | * This assumes the interesting part of the payload is in the first part |
200 | * of the buffer for received data. This may not be appropriate to use for |
201 | * buffers being transmitted. |
202 | */ |
203 | static inline void *fc_frame_payload_get(const struct fc_frame *fp, |
204 | size_t len) |
205 | { |
206 | void *pp = NULL; |
207 | |
208 | if (fr_len(fp) >= sizeof(struct fc_frame_header) + len) |
209 | pp = fc_frame_header_get(fp) + 1; |
210 | return pp; |
211 | } |
212 | |
213 | /* |
214 | * Get frame payload opcode (first byte) from message in fc_frame structure. |
215 | * This hides a cast and provides a place to add some checking. Return 0 |
216 | * if the frame has no payload. |
217 | */ |
218 | static inline u8 fc_frame_payload_op(const struct fc_frame *fp) |
219 | { |
220 | u8 *cp; |
221 | |
222 | cp = fc_frame_payload_get(fp, sizeof(u8)); |
223 | if (!cp) |
224 | return 0; |
225 | return *cp; |
226 | |
227 | } |
228 | |
229 | /* |
230 | * Get FC class from frame. |
231 | */ |
232 | static inline enum fc_class fc_frame_class(const struct fc_frame *fp) |
233 | { |
234 | return fc_sof_class(fr_sof(fp)); |
235 | } |
236 | |
237 | /* |
238 | * Check the CRC in a frame. |
239 | * The CRC immediately follows the last data item *AFTER* the length. |
240 | * The return value is zero if the CRC matches. |
241 | */ |
242 | u32 fc_frame_crc_check(struct fc_frame *); |
243 | |
244 | static inline u8 fc_frame_rctl(const struct fc_frame *fp) |
245 | { |
246 | return fc_frame_header_get(fp)->fh_r_ctl; |
247 | } |
248 | |
249 | static inline bool fc_frame_is_cmd(const struct fc_frame *fp) |
250 | { |
251 | return fc_frame_rctl(fp) == FC_RCTL_DD_UNSOL_CMD; |
252 | } |
253 | |
254 | /* |
255 | * Check for leaks. |
256 | * Print the frame header of any currently allocated frame, assuming there |
257 | * should be none at this point. |
258 | */ |
259 | void fc_frame_leak_check(void); |
260 | |
261 | #endif /* _FC_FRAME_H_ */ |
262 |
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