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authorJoe Eykholt <jeykholt@cisco.com>2010-07-20 15:20:56 -0700
committerJames Bottomley <James.Bottomley@suse.de>2010-07-28 09:05:59 -0500
commit251748a99e631a2c46edcf9e519cfc60fae8153d (patch)
tree6255e513473fffde4691f761c53e82440d763d18 /include/scsi
parent079ecd8cfe95dfd28b74f3a00d66fdbcdfc8c611 (diff)
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[SCSI] libfc: add fc_frame_sid() and fc_frame_did() functions
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>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/fc_frame.h45
-rw-r--r--include/scsi/libfc.h18
2 files changed, 44 insertions, 19 deletions
diff --git a/include/scsi/fc_frame.h b/include/scsi/fc_frame.h
index 29dd97d5b53..4ad02041b66 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);
}
/*
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index e6f07fba432..f1ce793f33b 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -42,24 +42,6 @@
#define FC_EX_TIMEOUT 1 /* Exchange timeout */
#define FC_EX_CLOSED 2 /* Exchange closed */
-/* 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;
-}
-
/**
* enum fc_lport_state - Local port states
* @LPORT_ST_DISABLED: Disabled