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storvsc: Untangle the storage protocol negotiation from the vmbus protocol negotiation. 

Currently we are making decisions based on vmbus protocol versions
that have been negotiated; use storage potocol versions instead.

[jejb: fold ARRAY_SIZE conversion suggested by Johannes Thumshirn
<jthumshirn@suse.de>
make vmstor_protocol static]
Tested-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: Keith Mange <keith.mange@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Keith Mange 2015-08-13 08:43:48 -07:00 committed by James Bottomley
parent 2492fd7a60
commit 1a3631081d
1 changed files with 86 additions and 22 deletions
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80
drivers/scsi/storvsc_drv.c
View File

@ -56,14 +56,18 @@
* V1 RC > 2008/1/31: 2.0
* Win7: 4.2
* Win8: 5.1
* Win8.1: 6.0
* Win10: 6.2
*/
#define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \
(((MINOR_) & 0xff)))
#define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0)
#define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2)
#define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1)
#define VMSTOR_PROTO_VERSION_WIN8_1 VMSTOR_PROTO_VERSION(6, 0)
#define VMSTOR_PROTO_VERSION_WIN10 VMSTOR_PROTO_VERSION(6, 2)
/* Packet structure describing virtual storage requests. */
enum vstor_packet_operation {
@ -204,6 +208,45 @@ struct vmscsi_request {
} __attribute((packed));
/*
* The list of storage protocols in order of preference.
*/
struct vmstor_protocol {
int protocol_version;
int sense_buffer_size;
int vmscsi_size_delta;
};
static const struct vmstor_protocol vmstor_protocols[] = {
{
VMSTOR_PROTO_VERSION_WIN10,
POST_WIN7_STORVSC_SENSE_BUFFER_SIZE,
0
},
{
VMSTOR_PROTO_VERSION_WIN8_1,
POST_WIN7_STORVSC_SENSE_BUFFER_SIZE,
0
},
{
VMSTOR_PROTO_VERSION_WIN8,
POST_WIN7_STORVSC_SENSE_BUFFER_SIZE,
0
},
{
VMSTOR_PROTO_VERSION_WIN7,
PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE,
sizeof(struct vmscsi_win8_extension),
},
{
VMSTOR_PROTO_VERSION_WIN6,
PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE,
sizeof(struct vmscsi_win8_extension),
}
};
/*
* This structure is sent during the intialization phase to get the different
* properties of the channel.
@ -864,7 +907,7 @@ static int storvsc_channel_init(struct hv_device *device)
struct storvsc_device *stor_device;
struct storvsc_cmd_request *request;
struct vstor_packet *vstor_packet;
int ret, t;
int ret, t, i;
int max_chns;
bool process_sub_channels = false;
@ -904,12 +947,15 @@ static int storvsc_channel_init(struct hv_device *device)
goto cleanup;
for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) {
/* reuse the packet for version range supported */
memset(vstor_packet, 0, sizeof(struct vstor_packet));
vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
vstor_packet->operation =
VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
vstor_packet->flags = REQUEST_COMPLETION_FLAG;
vstor_packet->version.major_minor = vmstor_proto_version;
vstor_packet->version.major_minor =
vmstor_protocols[i].protocol_version;
/*
* The revision number is only used in Windows; set it to 0.
@ -931,9 +977,29 @@ static int storvsc_channel_init(struct hv_device *device)
goto cleanup;
}
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
vstor_packet->status != 0)
if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO) {
ret = -EINVAL;
goto cleanup;
}
if (vstor_packet->status == 0) {
vmstor_proto_version =
vmstor_protocols[i].protocol_version;
sense_buffer_size =
vmstor_protocols[i].sense_buffer_size;
vmscsi_size_delta =
vmstor_protocols[i].vmscsi_size_delta;
break;
}
}
if (vstor_packet->status != 0) {
ret = -EINVAL;
goto cleanup;
}
memset(vstor_packet, 0, sizeof(struct vstor_packet));
@ -1746,14 +1812,12 @@ static int storvsc_probe(struct hv_device *device,
if (vmbus_proto_version < VERSION_WIN8) {
sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
vmstor_proto_version = VMSTOR_PROTO_VERSION_WIN7;
max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET;
max_targets = STORVSC_IDE_MAX_TARGETS;
max_channels = STORVSC_IDE_MAX_CHANNELS;
} else {
sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
vmscsi_size_delta = 0;
vmstor_proto_version = VMSTOR_PROTO_VERSION_WIN8;
max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET;
max_targets = STORVSC_MAX_TARGETS;
max_channels = STORVSC_MAX_CHANNELS;