[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>

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index de43795..f13e7ab 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -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 */