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scsi: storvsc: Removing Pre Win8 related logic
The latest storvsc code has already removed the support for windows 7 and earlier. There is still some code logic remaining which is there to support pre Windows 8 OS. This patch removes these stale logic. This patch majorly does three things : 1. Removes vmscsi_size_delta and its logic, as the vmscsi_request struct is same for all the OS post windows 8 there is no need of delta. 2. Simplify sense_buffer_size logic, as there is single buffer size for all the post windows 8 OS. 3. Embed the vmscsi_win8_extension structure inside the vmscsi_request, as there is no separate handling required for different OS. Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Link: https://lore.kernel.org/r/1653478022-26621-1-git-send-email-ssengar@linux.microsoft.com Signed-off-by: Wei Liu <wei.liu@kernel.org>
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1940f9f81d
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1 changed files with 39 additions and 116 deletions
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@ -54,7 +54,6 @@
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#define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \
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(((MINOR_) & 0xff)))
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#define VMSTOR_PROTO_VERSION_WIN6 VMSTOR_PROTO_VERSION(2, 0)
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#define VMSTOR_PROTO_VERSION_WIN7 VMSTOR_PROTO_VERSION(4, 2)
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#define VMSTOR_PROTO_VERSION_WIN8 VMSTOR_PROTO_VERSION(5, 1)
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@ -136,20 +135,10 @@ struct hv_fc_wwn_packet {
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*/
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#define STORVSC_MAX_CMD_LEN 0x10
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#define POST_WIN7_STORVSC_SENSE_BUFFER_SIZE 0x14
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#define PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE 0x12
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/* Sense buffer size is the same for all versions since Windows 8 */
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#define STORVSC_SENSE_BUFFER_SIZE 0x14
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#define STORVSC_MAX_BUF_LEN_WITH_PADDING 0x14
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/*
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* Sense buffer size changed in win8; have a run-time
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* variable to track the size we should use. This value will
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* likely change during protocol negotiation but it is valid
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* to start by assuming pre-Win8.
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*/
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static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
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/*
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* The storage protocol version is determined during the
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* initial exchange with the host. It will indicate which
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@ -177,18 +166,6 @@ do { \
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dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \
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} while (0)
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struct vmscsi_win8_extension {
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/*
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* The following were added in Windows 8
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*/
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u16 reserve;
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u8 queue_tag;
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u8 queue_action;
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u32 srb_flags;
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u32 time_out_value;
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u32 queue_sort_ey;
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} __packed;
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struct vmscsi_request {
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u16 length;
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u8 srb_status;
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@ -214,46 +191,23 @@ struct vmscsi_request {
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/*
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* The following was added in win8.
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*/
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struct vmscsi_win8_extension win8_extension;
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u16 reserve;
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u8 queue_tag;
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u8 queue_action;
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u32 srb_flags;
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u32 time_out_value;
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u32 queue_sort_ey;
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} __attribute((packed));
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/*
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* The list of storage protocols in order of preference.
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* The list of windows version in order of preference.
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*/
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struct vmstor_protocol {
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int protocol_version;
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int sense_buffer_size;
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int vmscsi_size_delta;
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};
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static const struct vmstor_protocol vmstor_protocols[] = {
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{
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static const int protocol_version[] = {
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VMSTOR_PROTO_VERSION_WIN10,
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POST_WIN7_STORVSC_SENSE_BUFFER_SIZE,
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0
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},
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{
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VMSTOR_PROTO_VERSION_WIN8_1,
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POST_WIN7_STORVSC_SENSE_BUFFER_SIZE,
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0
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},
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{
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VMSTOR_PROTO_VERSION_WIN8,
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POST_WIN7_STORVSC_SENSE_BUFFER_SIZE,
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0
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},
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{
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VMSTOR_PROTO_VERSION_WIN7,
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PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE,
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sizeof(struct vmscsi_win8_extension),
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},
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{
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VMSTOR_PROTO_VERSION_WIN6,
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PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE,
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sizeof(struct vmscsi_win8_extension),
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}
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};
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@ -409,9 +363,7 @@ static void storvsc_on_channel_callback(void *context);
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#define STORVSC_IDE_MAX_CHANNELS 1
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/*
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* Upper bound on the size of a storvsc packet. vmscsi_size_delta is not
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* included in the calculation because it is set after STORVSC_MAX_PKT_SIZE
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* is used in storvsc_connect_to_vsp
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* Upper bound on the size of a storvsc packet.
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*/
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#define STORVSC_MAX_PKT_SIZE (sizeof(struct vmpacket_descriptor) +\
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sizeof(struct vstor_packet))
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@ -452,17 +404,6 @@ struct storvsc_device {
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unsigned char path_id;
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unsigned char target_id;
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/*
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* The size of the vmscsi_request has changed in win8. The
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* additional size is because of new elements added to the
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* structure. These elements are valid only when we are talking
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* to a win8 host.
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* Track the correction to size we need to apply. This value
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* will likely change during protocol negotiation but it is
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* valid to start by assuming pre-Win8.
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*/
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int vmscsi_size_delta;
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/*
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* Max I/O, the device can support.
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*/
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@ -795,8 +736,7 @@ static void handle_multichannel_storage(struct hv_device *device, int max_chns)
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vstor_packet->sub_channel_count = num_sc;
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ret = vmbus_sendpacket(device->channel, vstor_packet,
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(sizeof(struct vstor_packet) -
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stor_device->vmscsi_size_delta),
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sizeof(struct vstor_packet),
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VMBUS_RQST_INIT,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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@ -864,8 +804,7 @@ static int storvsc_execute_vstor_op(struct hv_device *device,
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vstor_packet->flags = REQUEST_COMPLETION_FLAG;
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ret = vmbus_sendpacket(device->channel, vstor_packet,
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(sizeof(struct vstor_packet) -
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stor_device->vmscsi_size_delta),
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sizeof(struct vstor_packet),
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VMBUS_RQST_INIT,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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@ -915,14 +854,13 @@ static int storvsc_channel_init(struct hv_device *device, bool is_fc)
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* Query host supported protocol version.
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*/
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for (i = 0; i < ARRAY_SIZE(vmstor_protocols); i++) {
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for (i = 0; i < ARRAY_SIZE(protocol_version); i++) {
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/* reuse the packet for version range supported */
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memset(vstor_packet, 0, sizeof(struct vstor_packet));
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vstor_packet->operation =
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VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
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vstor_packet->version.major_minor =
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vmstor_protocols[i].protocol_version;
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vstor_packet->version.major_minor = protocol_version[i];
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/*
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* The revision number is only used in Windows; set it to 0.
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@ -936,21 +874,16 @@ static int storvsc_channel_init(struct hv_device *device, bool is_fc)
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return -EINVAL;
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if (vstor_packet->status == 0) {
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vmstor_proto_version =
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vmstor_protocols[i].protocol_version;
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sense_buffer_size =
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vmstor_protocols[i].sense_buffer_size;
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stor_device->vmscsi_size_delta =
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vmstor_protocols[i].vmscsi_size_delta;
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vmstor_proto_version = protocol_version[i];
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break;
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}
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}
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if (vstor_packet->status != 0)
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if (vstor_packet->status != 0) {
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dev_err(&device->device, "Obsolete Hyper-V version\n");
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return -EINVAL;
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}
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memset(vstor_packet, 0, sizeof(struct vstor_packet));
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@ -986,11 +919,10 @@ static int storvsc_channel_init(struct hv_device *device, bool is_fc)
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cpumask_set_cpu(device->channel->target_cpu,
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&stor_device->alloced_cpus);
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if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) {
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if (vstor_packet->storage_channel_properties.flags &
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STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
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process_sub_channels = true;
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}
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if (vstor_packet->storage_channel_properties.flags &
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STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
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process_sub_channels = true;
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stor_device->max_transfer_bytes =
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vstor_packet->storage_channel_properties.max_transfer_bytes;
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@ -1197,7 +1129,7 @@ static void storvsc_on_io_completion(struct storvsc_device *stor_device,
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* Copy over the sense_info_length, but limit to the known max
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* size if Hyper-V returns a bad value.
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*/
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stor_pkt->vm_srb.sense_info_length = min_t(u8, sense_buffer_size,
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stor_pkt->vm_srb.sense_info_length = min_t(u8, STORVSC_SENSE_BUFFER_SIZE,
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vstor_packet->vm_srb.sense_info_length);
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if (vstor_packet->vm_srb.scsi_status != 0 ||
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@ -1289,8 +1221,8 @@ static void storvsc_on_channel_callback(void *context)
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struct storvsc_cmd_request *request = NULL;
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u32 pktlen = hv_pkt_datalen(desc);
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u64 rqst_id = desc->trans_id;
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u32 minlen = rqst_id ? sizeof(struct vstor_packet) -
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stor_device->vmscsi_size_delta : sizeof(enum vstor_packet_operation);
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u32 minlen = rqst_id ? sizeof(struct vstor_packet) :
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sizeof(enum vstor_packet_operation);
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if (pktlen < minlen) {
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dev_err(&device->device,
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}
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memcpy(&request->vstor_packet, packet,
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(sizeof(struct vstor_packet) - stor_device->vmscsi_size_delta));
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sizeof(struct vstor_packet));
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complete(&request->wait_event);
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}
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}
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found_channel:
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vstor_packet->flags |= REQUEST_COMPLETION_FLAG;
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vstor_packet->vm_srb.length = (sizeof(struct vmscsi_request) -
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stor_device->vmscsi_size_delta);
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vstor_packet->vm_srb.length = sizeof(struct vmscsi_request);
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vstor_packet->vm_srb.sense_info_length = sense_buffer_size;
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vstor_packet->vm_srb.sense_info_length = STORVSC_SENSE_BUFFER_SIZE;
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vstor_packet->vm_srb.data_transfer_length =
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ret = vmbus_sendpacket_mpb_desc(outgoing_channel,
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request->payload, request->payload_sz,
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vstor_packet,
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(sizeof(struct vstor_packet) -
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stor_device->vmscsi_size_delta),
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sizeof(struct vstor_packet),
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(unsigned long)request);
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} else {
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ret = vmbus_sendpacket(outgoing_channel, vstor_packet,
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(sizeof(struct vstor_packet) -
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stor_device->vmscsi_size_delta),
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sizeof(struct vstor_packet),
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(unsigned long)request,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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vstor_packet->vm_srb.path_id = stor_device->path_id;
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ret = vmbus_sendpacket(device->channel, vstor_packet,
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(sizeof(struct vstor_packet) -
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stor_device->vmscsi_size_delta),
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sizeof(struct vstor_packet),
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VMBUS_RQST_RESET,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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memset(&cmd_request->vstor_packet, 0, sizeof(struct vstor_packet));
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vm_srb = &cmd_request->vstor_packet.vm_srb;
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vm_srb->win8_extension.time_out_value = 60;
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vm_srb->time_out_value = 60;
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vm_srb->win8_extension.srb_flags |=
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vm_srb->srb_flags |=
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SRB_FLAGS_DISABLE_SYNCH_TRANSFER;
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if (scmnd->device->tagged_supported) {
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vm_srb->win8_extension.srb_flags |=
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vm_srb->srb_flags |=
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(SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE);
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vm_srb->win8_extension.queue_tag = SP_UNTAGGED;
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vm_srb->win8_extension.queue_action = SRB_SIMPLE_TAG_REQUEST;
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vm_srb->queue_tag = SP_UNTAGGED;
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vm_srb->queue_action = SRB_SIMPLE_TAG_REQUEST;
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}
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/* Build the SRB */
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switch (scmnd->sc_data_direction) {
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case DMA_TO_DEVICE:
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vm_srb->data_in = WRITE_TYPE;
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vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_OUT;
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vm_srb->srb_flags |= SRB_FLAGS_DATA_OUT;
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break;
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case DMA_FROM_DEVICE:
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vm_srb->data_in = READ_TYPE;
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vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
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vm_srb->srb_flags |= SRB_FLAGS_DATA_IN;
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break;
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case DMA_NONE:
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vm_srb->data_in = UNKNOWN_TYPE;
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vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER;
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vm_srb->srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER;
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break;
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default:
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/*
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init_waitqueue_head(&stor_device->waiting_to_drain);
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stor_device->device = device;
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stor_device->host = host;
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stor_device->vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
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spin_lock_init(&stor_device->lock);
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hv_set_drvdata(device, stor_device);
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dma_set_min_align_mask(&device->device, HV_HYP_PAGE_SIZE - 1);
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@ -2217,10 +2144,6 @@ static int __init storvsc_drv_init(void)
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* than the ring buffer size since that page is reserved for
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* the ring buffer indices) by the max request size (which is
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* vmbus_channel_packet_multipage_buffer + struct vstor_packet + u64)
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*
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* The computation underestimates max_outstanding_req_per_channel
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* for Win7 and older hosts because it does not take into account
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* the vmscsi_size_delta correction to the max request size.
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*/
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max_outstanding_req_per_channel =
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((storvsc_ringbuffer_size - PAGE_SIZE) /
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