lkml.org 
[lkml]   [2012]   [Feb]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 1/3] firewire-sbp2: Take into account Unit_Unique_ID
Date
If the target's unit directory contains a Unit_Unique_ID entry, we
should use that as the target's GUID for identification purposes. The
SBP-2 standards document says:

"Although the node unique ID (EUI-64) present in the bus information
block is sufficient to uniquely identify nodes attached to Serial Bus,
it is insufficient to identify a target when a vendor implements a
device with multiple Serial Bus node connections. In this case initiator
software requires information by which a particular target may be
uniquely identified, regardless of the Serial Bus access path used."

[ IEEE T10 P1155D Revision 4, Section 7.6 (page 51) ] and
[ IEEE T10 P1467D Revision 5, Section 7.9 (page 74) ]

Signed-off-by: Chris Boot <bootc@bootc.net>
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: Clemens Ladisch <clemens@ladisch.de>
---
drivers/firewire/sbp2.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index 80e95aa..a8f43d2 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -211,6 +211,7 @@ static struct fw_device *target_device(struct sbp2_target *tgt)
#define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a
#define SBP2_CSR_FIRMWARE_REVISION 0x3c
#define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14
+#define SBP2_CSR_UNIT_UNIQUE_ID 0x8d
#define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4

/* Management orb opcodes */
@@ -997,6 +998,13 @@ static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
return 0;
}

+static void sbp2_get_unit_unique_id(struct sbp2_target *tgt,
+ const u32 *leaf)
+{
+ if ((leaf[0] & 0xffff0000) == 0x00020000)
+ tgt->guid = (u64)leaf[1] << 32 | leaf[2];
+}
+
static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt,
const u32 *directory)
{
@@ -1048,6 +1056,10 @@ static int sbp2_scan_unit_dir(struct sbp2_target *tgt, const u32 *directory,
return -ENOMEM;
break;

+ case SBP2_CSR_UNIT_UNIQUE_ID:
+ sbp2_get_unit_unique_id(tgt, ci.p - 1 + value);
+ break;
+
case SBP2_CSR_LOGICAL_UNIT_DIRECTORY:
/* Adjust for the increment in the iterator */
if (sbp2_scan_logical_unit_dir(tgt, ci.p - 1 + value) < 0)
--
1.7.9


\
 
 \ /
  Last update: 2012-02-15 16:01    [W:0.085 / U:33.012 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site