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[PATCH] cciss: direct lookup for command completions

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This patch changes the way we complete commands.  In the old method when we
got a completion we searched our command list from the top until we find it.

This method uses a tag associated with each command (not SCSI command tagging)
to index us directly to the completed command.  This helps performance.

Signed-off-by: Don Brace <dab@hp.com>
Signed-off-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mike Miller
2005-09-13 01:25:22 -07:00
committed by Linus Torvalds
parent ddd474420a
commit 33079b2197
4 changed files with 73 additions and 7 deletions
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drivers/block/cciss_cmd.h
+6 -2
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@@ -226,6 +226,10 @@ typedef struct _ErrorInfo_struct {
#define CMD_MSG_DONE 0x04
#define CMD_MSG_TIMEOUT 0x05
/* This structure needs to be divisible by 8 for new
* indexing method.
*/
#define PADSIZE (sizeof(long) - 4)
typedef struct _CommandList_struct {
CommandListHeader_struct Header;
RequestBlock_struct Request;
@@ -236,14 +240,14 @@ typedef struct _CommandList_struct {
ErrorInfo_struct * err_info; /* pointer to the allocated mem */
int ctlr;
int cmd_type;
long cmdindex;
struct _CommandList_struct *prev;
struct _CommandList_struct *next;
struct request * rq;
struct completion *waiting;
int retry_count;
#ifdef CONFIG_CISS_SCSI_TAPE
void * scsi_cmd;
#endif
char pad[PADSIZE];
} CommandList_struct;
//Configuration Table Structure