lkml.org 
[lkml]   [2014]   [Oct]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] scsi: storvsc: Force SPC-3 for Win8 Hosts or Later
Date
This patch forces SPC-3 for Hyper-V disks on the VMBus. As Windows 10's
virtual SAS bus is SPC-3 compliant and there are no negative side effects
on forcing SPC-3 compliance for Win8 hosts, this patch enables SPC-3
compliance by forcing it on for hosts with versions later than Win8.

Forcing SPC-3 compliance for hosts earlier than Win10 also enables
TRIM support.

Suggested by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Jeff Leung <jleung@v10networks.ca>
---
drivers/scsi/storvsc_drv.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index ed0f899..afcc68e 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1449,6 +1449,15 @@ static int storvsc_device_configure(struct scsi_device *sdevice)

sdevice->no_write_same = 1;

+ /*
+ * If the host is Win2k12 or later, we pretend to be SPC-3 compliant
+ * and send RC16 which activates TRIM. We will only enable this on a
+ * host with levels greater than VERSION_WIN8
+ */
+ if (vmbus_proto_version >= VERSION_WIN8) {
+ sdevice->scsi_level = SCSI_SPC_3;
+ }
+
return 0;
}

--
1.7.2.5


\
 
 \ /
  Last update: 2014-10-21 08:01    [W:1.064 / U:2.152 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site