[PATCH 4/6] Drivers: scsi: storvsc: Update the storage protocol to win8 level

K. Y. Srinivasan
2013-05-15T21:28:43Z

Update the storage protocol to the win8 level.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
---
drivers/scsi/storvsc_drv.c | 203 ++++++++++++++++++++++++++++++++++++--------
1 files changed, 168 insertions(+), 35 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 8d29a95..a3cf85c 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -55,10 +55,15 @@
* V1 RC < 2008/1/31: 1.0
* V1 RC > 2008/1/31: 2.0
* Win7: 4.2
+ * Win8: 5.1
*/

-#define VMSTOR_CURRENT_MAJOR 4
-#define VMSTOR_CURRENT_MINOR 2
+
+#define VMSTOR_WIN7_MAJOR 4
+#define VMSTOR_WIN7_MINOR 2
+
+#define VMSTOR_WIN8_MAJOR 5
+#define VMSTOR_WIN8_MINOR 1

/* Packet structure describing virtual storage requests. */
@@ -74,18 +79,103 @@ enum vstor_packet_operation {
VSTOR_OPERATION_QUERY_PROTOCOL_VERSION = 9,
VSTOR_OPERATION_QUERY_PROPERTIES = 10,
VSTOR_OPERATION_ENUMERATE_BUS = 11,
- VSTOR_OPERATION_MAXIMUM = 11
+ VSTOR_OPERATION_FCHBA_DATA = 12,
+ VSTOR_OPERATION_CREATE_SUB_CHANNELS = 13,
+ VSTOR_OPERATION_MAXIMUM = 13
+};
+
+/*
+ * WWN packet for Fiber Channel HBA
+ */
+
+struct hv_fc_wwn_packet {
+ bool primary_active;
+ u8 reserved1;
+ u8 reserved2;
+ u8 primary_port_wwn[8];
+ u8 primary_node_wwn[8];
+ u8 secondary_port_wwn[8];
+ u8 secondary_node_wwn[8];
};

+
+
+/*
+ * SRB Flag Bits
+ */
+
+#define SRB_FLAGS_QUEUE_ACTION_ENABLE 0x00000002
+#define SRB_FLAGS_DISABLE_DISCONNECT 0x00000004
+#define SRB_FLAGS_DISABLE_SYNCH_TRANSFER 0x00000008
+#define SRB_FLAGS_BYPASS_FROZEN_QUEUE 0x00000010
+#define SRB_FLAGS_DISABLE_AUTOSENSE 0x00000020
+#define SRB_FLAGS_DATA_IN 0x00000040
+#define SRB_FLAGS_DATA_OUT 0x00000080
+#define SRB_FLAGS_NO_DATA_TRANSFER 0x00000000
+#define SRB_FLAGS_UNSPECIFIED_DIRECTION (SRB_FLAGS_DATA_IN | SRB_FLAGS_DATA_OUT)
+#define SRB_FLAGS_NO_QUEUE_FREEZE 0x00000100
+#define SRB_FLAGS_ADAPTER_CACHE_ENABLE 0x00000200
+#define SRB_FLAGS_FREE_SENSE_BUFFER 0x00000400
+
+/*
+ * This flag indicates the request is part of the workflow for processing a D3.
+ */
+#define SRB_FLAGS_D3_PROCESSING 0x00000800
+#define SRB_FLAGS_IS_ACTIVE 0x00010000
+#define SRB_FLAGS_ALLOCATED_FROM_ZONE 0x00020000
+#define SRB_FLAGS_SGLIST_FROM_POOL 0x00040000
+#define SRB_FLAGS_BYPASS_LOCKED_QUEUE 0x00080000
+#define SRB_FLAGS_NO_KEEP_AWAKE 0x00100000
+#define SRB_FLAGS_PORT_DRIVER_ALLOCSENSE 0x00200000
+#define SRB_FLAGS_PORT_DRIVER_SENSEHASPORT 0x00400000
+#define SRB_FLAGS_DONT_START_NEXT_PACKET 0x00800000
+#define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000
+#define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000
+
+
/*
* Platform neutral description of a scsi request -
* this remains the same across the write regardless of 32/64 bit
* note: it's patterned off the SCSI_PASS_THROUGH structure
*/
#define STORVSC_MAX_CMD_LEN 0x10
-#define STORVSC_SENSE_BUFFER_SIZE 0x12
+
+#define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14
+#define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12
+
+#define STORVSC_SENSE_BUFFER_SIZE 0x14
#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14

+/*
+ * Sense buffer size changed in win8; have a run-time
+ * variable to track the size we should use.
+ */
+static int sense_buffer_size;
+
+/*
+ * The size of the vmscsi_request has changed in win8. The
+ * additional size is because of new elements added to the
+ * structure. These elements are valid only when we are talking
+ * to a win8 host.
+ * Track the correction to size we need to apply.
+ */
+
+static int vmscsi_size_delta;
+static int vmstor_current_major;
+static int vmstor_current_minor;
+
+struct vmscsi_win8_extension {
+ /*
+ * The following were added in Windows 8
+ */
+ u16 reserve;
+ u8 queue_tag;
+ u8 queue_action;
+ u32 srb_flags;
+ u32 time_out_value;
+ u32 queue_sort_ey;
+} __packed;
+
struct vmscsi_request {
u16 length;
u8 srb_status;
@@ -108,6 +198,11 @@ struct vmscsi_request {
u8 sense_data[STORVSC_SENSE_BUFFER_SIZE];
u8 reserved_array[STORVSC_MAX_BUF_LEN_WITH_PADDING];
};
+ /*
+ * The following was added in win8.
+ */
+ struct vmscsi_win8_extension win8_extension;
+
} __attribute((packed));

@@ -115,22 +210,18 @@ struct vmscsi_request {
* This structure is sent during the intialization phase to get the different
* properties of the channel.
*/
+
+#define STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL 0x1
+
struct vmstorage_channel_properties {
- u16 protocol_version;
- u8 path_id;
- u8 target_id;
+ u32 reserved;
+ u16 max_channel_cnt;
+ u16 reserved1;

- /* Note: port number is only really known on the client side */
- u32 port_number;
- u32 flags;
+ u32 flags;
u32 max_transfer_bytes;

- /*
- * This id is unique for each channel and will correspond with
- * vendor specific data in the inquiry data.
- */
-
- u64 unique_id;
+ u64 reserved2;
} __packed;

/* This structure is sent during the storage protocol negotiations. */
@@ -175,6 +266,15 @@ struct vstor_packet {

/* Used during version negotiations. */
struct vmstorage_protocol_version version;
+
+ /* Fiber channel address packet */
+ struct hv_fc_wwn_packet wwn_packet;
+
+ /* Number of sub-channels to create */
+ u16 sub_channel_count;
+
+ /* This will be the maximum of the union members */
+ u8 buffer[0x34];
};
} __packed;

@@ -681,7 +781,8 @@ static int storvsc_channel_init(struct hv_device *device)
vstor_packet->flags = REQUEST_COMPLETION_FLAG;

ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
(unsigned long)request,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
@@ -705,7 +806,7 @@ static int storvsc_channel_init(struct hv_device *device)
vstor_packet->flags = REQUEST_COMPLETION_FLAG;

vstor_packet->version.major_minor =
- storvsc_get_version(VMSTOR_CURRENT_MAJOR, VMSTOR_CURRENT_MINOR);
+ storvsc_get_version(vmstor_current_major, vmstor_current_minor);

/*
* The revision number is only used in Windows; set it to 0.
@@ -713,7 +814,8 @@ static int storvsc_channel_init(struct hv_device *device)
vstor_packet->version.revision = 0;

ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
(unsigned long)request,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
@@ -734,11 +836,10 @@ static int storvsc_channel_init(struct hv_device *device)
memset(vstor_packet, 0, sizeof(struct vstor_packet));
vstor_packet->operation = VSTOR_OPERATION_QUERY_PROPERTIES;
vstor_packet->flags = REQUEST_COMPLETION_FLAG;
- vstor_packet->storage_channel_properties.port_number =
- stor_device->port_number;

ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
(unsigned long)request,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
@@ -756,16 +857,13 @@ static int storvsc_channel_init(struct hv_device *device)
vstor_packet->status != 0)
goto cleanup;

- stor_device->path_id = vstor_packet->storage_channel_properties.path_id;
- stor_device->target_id
- = vstor_packet->storage_channel_properties.target_id;
-
memset(vstor_packet, 0, sizeof(struct vstor_packet));
vstor_packet->operation = VSTOR_OPERATION_END_INITIALIZATION;
vstor_packet->flags = REQUEST_COMPLETION_FLAG;

ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
(unsigned long)request,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
@@ -1019,7 +1117,8 @@ static void storvsc_on_channel_callback(void *context)

do {
ret = vmbus_recvpacket(device->channel, packet,
- ALIGN(sizeof(struct vstor_packet), 8),
+ ALIGN((sizeof(struct vstor_packet) -
+ vmscsi_size_delta), 8),
&bytes_recvd, &request_id);
if (ret == 0 && bytes_recvd > 0) {

@@ -1030,7 +1129,8 @@ static void storvsc_on_channel_callback(void *context)
(request == &stor_device->reset_request)) {

memcpy(&request->vstor_packet, packet,
- sizeof(struct vstor_packet));
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta));
complete(&request->wait_event);
} else {
storvsc_on_receive(device,
@@ -1123,10 +1223,11 @@ static int storvsc_do_io(struct hv_device *device,

vstor_packet->flags |= REQUEST_COMPLETION_FLAG;

- vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);
+ vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
+ vmscsi_size_delta);

- vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE;
+ vstor_packet->vm_srb.sense_info_length = sense_buffer_size;

vstor_packet->vm_srb.data_transfer_length =
@@ -1138,11 +1239,13 @@ static int storvsc_do_io(struct hv_device *device,
ret = vmbus_sendpacket_multipagebuffer(device->channel,
&request->data_buffer,
vstor_packet,
- sizeof(struct vstor_packet),
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
(unsigned long)request);
} else {
ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
(unsigned long)request,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
@@ -1266,7 +1369,8 @@ static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
vstor_packet->vm_srb.path_id = stor_device->path_id;

ret = vmbus_sendpacket(device->channel, vstor_packet,
- sizeof(struct vstor_packet),
+ (sizeof(struct vstor_packet) -
+ vmscsi_size_delta),
(unsigned long)&stor_device->reset_request,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
@@ -1351,18 +1455,28 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
scmnd->host_scribble = (unsigned char *)cmd_request;

vm_srb = &cmd_request->vstor_packet.vm_srb;
+ vm_srb->win8_extension.time_out_value = 60;

/* Build the SRB */
switch (scmnd->sc_data_direction) {
case DMA_TO_DEVICE:
vm_srb->data_in = WRITE_TYPE;
+ vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT;
+ vm_srb->win8_extension.srb_flags |=
+ (SRB_FLAGS_QUEUE_ACTION_ENABLE |
+ SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
break;
case DMA_FROM_DEVICE:
vm_srb->data_in = READ_TYPE;
+ vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
+ vm_srb->win8_extension.srb_flags |=
+ (SRB_FLAGS_QUEUE_ACTION_ENABLE |
+ SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
break;
default:
vm_srb->data_in = UNKNOWN_TYPE;
+ vm_srb->win8_extension.srb_flags = 0;
break;
}

@@ -1494,6 +1608,24 @@ static int storvsc_probe(struct hv_device *device,
int target = 0;
struct storvsc_device *stor_device;

+ /*
+ * Based on the windows host we are running on,
+ * set state to properly communicate with the host.
+ */
+
+ if (vmbus_proto_version == VERSION_WIN8) {
+ sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
+ vmscsi_size_delta = 0;
+ vmstor_current_major = VMSTOR_WIN8_MAJOR;
+ vmstor_current_minor = VMSTOR_WIN8_MINOR;
+ } else {
+ sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
+ vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
+ vmstor_current_major = VMSTOR_WIN7_MAJOR;
+ vmstor_current_minor = VMSTOR_WIN7_MINOR;
+ }
+
+
host = scsi_host_alloc(&scsi_driver,
sizeof(struct hv_host_device));
if (!host)
@@ -1603,7 +1735,8 @@ static int __init storvsc_drv_init(void)
max_outstanding_req_per_channel =
((storvsc_ringbuffer_size - PAGE_SIZE) /
ALIGN(MAX_MULTIPAGE_BUFFER_PACKET +
- sizeof(struct vstor_packet) + sizeof(u64),
+ sizeof(struct vstor_packet) + sizeof(u64) -
+ vmscsi_size_delta,
sizeof(u64)));

if (max_outstanding_req_per_channel <
--
1.7.4.1