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[SCSI] megaraid_sas: Convert 6,10,12 byte CDB's for FastPath IO 

The following patch for megaraid_sas converts 6,10,12 byte CDB's to 16
byte CDB for large LBA's for FastPath IO.

Signed-off-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <jbottomley@parallels.com>
This commit is contained in:
adam radford 2011-05-11 18:34:40 -07:00 committed by James Bottomley
parent 541f90b7c6
commit 495c560970
1 changed files with 40 additions and 1 deletions
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41
drivers/scsi/megaraid/megaraid_sas_fusion.c
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@ -1137,7 +1137,7 @@ megasas_set_pd_lba(struct MPI2_RAID_SCSI_IO_REQUEST *io_request, u8 cdb_len,
u64 start_blk = io_info->pdBlock;
u8 *cdb = io_request->CDB.CDB32;
u32 num_blocks = io_info->numBlocks;
u8 opcode, flagvals, groupnum, control;
u8 opcode = 0, flagvals = 0, groupnum = 0, control = 0;
/* Check if T10 PI (DIF) is enabled for this LD */
ld = MR_TargetIdToLdGet(io_info->ldTgtId, local_map_ptr);
@ -1219,7 +1219,46 @@ megasas_set_pd_lba(struct MPI2_RAID_SCSI_IO_REQUEST *io_request, u8 cdb_len,
cdb[8] = (u8)(num_blocks & 0xff);
cdb[7] = (u8)((num_blocks >> 8) & 0xff);
io_request->IoFlags = 10; /* Specify 10-byte cdb */
cdb_len = 10;
} else if ((cdb_len < 16) && (start_blk > 0xffffffff)) {
/* Convert to 16 byte CDB for large LBA's */
switch (cdb_len) {
case 6:
opcode = cdb[0] == READ_6 ? READ_16 : WRITE_16;
control = cdb[5];
break;
case 10:
opcode =
cdb[0] == READ_10 ? READ_16 : WRITE_16;
flagvals = cdb[1];
groupnum = cdb[6];
control = cdb[9];
break;
case 12:
opcode =
cdb[0] == READ_12 ? READ_16 : WRITE_16;
flagvals = cdb[1];
groupnum = cdb[10];
control = cdb[11];
break;
}
memset(cdb, 0, sizeof(io_request->CDB.CDB32));
cdb[0] = opcode;
cdb[1] = flagvals;
cdb[14] = groupnum;
cdb[15] = control;
/* Transfer length */
cdb[13] = (u8)(num_blocks & 0xff);
cdb[12] = (u8)((num_blocks >> 8) & 0xff);
cdb[11] = (u8)((num_blocks >> 16) & 0xff);
cdb[10] = (u8)((num_blocks >> 24) & 0xff);
io_request->IoFlags = 16; /* Specify 16-byte cdb */
cdb_len = 16;
}
/* Normal case, just load LBA here */