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[SCSI] libfc: add fc_frame_sid() and fc_frame_did() functions

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To pave the way for eliminating exchanges from incoming requests,
add simple inline fc_frame_sid() and fc_frame_did() functions
which get the FC_IDs from the frame header.  This can be almost
as efficient as getting them from the sequence/exchange.

Move ntohll, htonll, ntoh24 and hton24 to <scsi/fc_frame.h>
since we need them there and that's included by <scsi/libfc.h>

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Joe Eykholt
2010-07-20 15:20:56 -07:00
committed by James Bottomley
parent 079ecd8cfe
commit 251748a99e
4 changed files with 54 additions and 47 deletions
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45
include/scsi/fc_frame.h
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@@ -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.
@@ -137,6 +154,16 @@ static inline int fc_frame_is_linear(struct fc_frame *fp)
return !skb_is_nonlinear(fp_skb(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.
@@ -145,7 +172,23 @@ 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);
}
/*