diff options
Diffstat (limited to 'include/scsi/fc_frame.h')
| -rw-r--r-- | include/scsi/fc_frame.h | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/include/scsi/fc_frame.h b/include/scsi/fc_frame.h index 29dd97d5b53a..4ad02041b667 100644 --- a/include/scsi/fc_frame.h +++ b/include/scsi/fc_frame.h @@ -30,6 +30,23 @@ #include <linux/if_ether.h> +/* some helpful macros */ + +#define ntohll(x) be64_to_cpu(x) +#define htonll(x) cpu_to_be64(x) + +static inline u32 ntoh24(const u8 *p) +{ + return (p[0] << 16) | (p[1] << 8) | p[2]; +} + +static inline void hton24(u8 *p, u32 v) +{ + p[0] = (v >> 16) & 0xff; + p[1] = (v >> 8) & 0xff; + p[2] = v & 0xff; +} + /* * The fc_frame interface is used to pass frame data between functions. * The frame includes the data buffer, length, and SOF / EOF delimiter types. @@ -139,13 +156,39 @@ static inline int fc_frame_is_linear(struct fc_frame *fp) /* * Get frame header from message in fc_frame structure. + * This version doesn't do a length check. + */ +static inline +struct fc_frame_header *__fc_frame_header_get(const struct fc_frame *fp) +{ + return (struct fc_frame_header *)fr_hdr(fp); +} + +/* + * Get frame header from message in fc_frame structure. * This hides a cast and provides a place to add some checking. */ static inline struct fc_frame_header *fc_frame_header_get(const struct fc_frame *fp) { WARN_ON(fr_len(fp) < sizeof(struct fc_frame_header)); - return (struct fc_frame_header *) fr_hdr(fp); + return __fc_frame_header_get(fp); +} + +/* + * Get source FC_ID (S_ID) from frame header in message. + */ +static inline u32 fc_frame_sid(const struct fc_frame *fp) +{ + return ntoh24(__fc_frame_header_get(fp)->fh_s_id); +} + +/* + * Get destination FC_ID (D_ID) from frame header in message. + */ +static inline u32 fc_frame_did(const struct fc_frame *fp) +{ + return ntoh24(__fc_frame_header_get(fp)->fh_d_id); } /* |