[SCSI] ibmvscsi: Enable fast fail feature

A new mode of error reporting, fast fail, has been added to the VIOS
which allows failover to happen more quickly.

If this new fast fail mode is enabled on the VIOS and the vSCSI client
supports the mode, the VIOS will not return MEDIUM error on path failures,
but rather return VIOSRP_ADAPTER_FAIL in the crq response, which
ibmvscsi will translate to DID_ERROR.

This new mode can be enabled for single path configurations as well,
so it is the new default error reporting mode. A module parameter is
provided to disable this new behavior on the off chance it causes a
problem on some old VIOS version.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/scsi/ibmvscsi/viosrp.h b/drivers/scsi/ibmvscsi/viosrp.h
index 204604501ad8..f5a9c26d1da8 100644
--- a/drivers/scsi/ibmvscsi/viosrp.h
+++ b/drivers/scsi/ibmvscsi/viosrp.h
@@ -86,7 +86,14 @@ enum viosrp_mad_types {
         VIOSRP_EMPTY_IU_TYPE = 0x01,
         VIOSRP_ERROR_LOG_TYPE = 0x02,
         VIOSRP_ADAPTER_INFO_TYPE = 0x03,
-        VIOSRP_HOST_CONFIG_TYPE = 0x04
+        VIOSRP_HOST_CONFIG_TYPE = 0x04,
+        VIOSRP_ENABLE_FAST_FAIL = 0x08,
+};
+
+enum viosrp_mad_status {
+        VIOSRP_MAD_SUCCESS = 0x00,
+        VIOSRP_MAD_NOT_SUPPORTED = 0xF1,
+        VIOSRP_MAD_FAILED = 0xF7,
 };
 
 /* 
@@ -127,11 +134,16 @@ struct viosrp_host_config {
         u64 buffer;
 };
 
+struct viosrp_fast_fail {
+        struct mad_common common;
+};
+
 union mad_iu {
         struct viosrp_empty_iu empty_iu;
         struct viosrp_error_log error_log;
         struct viosrp_adapter_info adapter_info;
         struct viosrp_host_config host_config;
+        struct viosrp_fast_fail fast_fail;
 };
 
 union viosrp_iu {