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SubjectRE: [PATCH 3/6] hv:scsi:Untangle the storage protocol negotiation from the vmbus protocol negotiation.
Date


> -----Original Message-----
> From: devel [mailto:driverdev-devel-bounces@linuxdriverproject.org] On
> Behalf Of K. Y. Srinivasan
> Sent: Friday, May 29, 2015 1:29 PM
> To: gregkh@linuxfoundation.org; linux-kernel@vger.kernel.org;
> devel@linuxdriverproject.org; ohering@suse.com; jbottomley@parallels.com;
> hch@infradead.org; linux-scsi@vger.kernel.org; apw@canonical.com;
> vkuznets@redhat.com; jasowang@redhat.com
> Cc: Keith Mange
> Subject: [PATCH 3/6] hv:scsi:Untangle the storage protocol negotiation from
> the vmbus protocol negotiation.
>
> From: keith.mange@microsoft.com <keith.mange@microsoft.com>
>
> Currently we are making decisions based on vmbus protocol versions that have
> been negotiated; use storage potocol versions instead.
>
Reviewed-by: Long Li <longli@microsoft.com>
> 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>
> ---
> drivers/scsi/storvsc_drv.c | 109 +++++++++++++++++++++++++++++++++++------
> ---
> 1 files changed, 87 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index
> 5f9d133..f29871e 100644
> --- a/drivers/scsi/storvsc_drv.c
> +++ b/drivers/scsi/storvsc_drv.c
> @@ -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 { @@ -205,6 +209,46 @@ struct vmscsi_request {
>
>
> /*
> + * The list of storage protocols in order of preference.
> + */
> +struct vmstor_protocol {
> + int protocol_version;
> + int sense_buffer_size;
> + int vmscsi_size_delta;
> +};
> +
> +#define VMSTOR_NUM_PROTOCOLS 5
> +
> +const struct vmstor_protocol vmstor_protocols[VMSTOR_NUM_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.
> */
> @@ -871,7 +915,7 @@ 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;
>
> @@ -911,36 +955,59 @@ static int storvsc_channel_init(struct hv_device
> *device)
> goto cleanup;
>
>
> - /* 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->flags = REQUEST_COMPLETION_FLAG;
> + for (i = 0; i < VMSTOR_NUM_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->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.
> - */
> - vstor_packet->version.revision = 0;
> + /*
> + * The revision number is only used in Windows; set it to 0.
> + */
> + vstor_packet->version.revision = 0;
>
> - ret = vmbus_sendpacket(device->channel, vstor_packet,
> + ret = vmbus_sendpacket(device->channel, vstor_packet,
> (sizeof(struct vstor_packet) -
> vmscsi_size_delta),
> (unsigned long)request,
> VM_PKT_DATA_INBAND,
>
> VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
> - if (ret != 0)
> - goto cleanup;
> + if (ret != 0)
> + goto cleanup;
>
> - t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
> - if (t == 0) {
> - ret = -ETIMEDOUT;
> - goto cleanup;
> + t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
> + if (t == 0) {
> + ret = -ETIMEDOUT;
> + goto cleanup;
> + }
> +
> + 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->operation != VSTOR_OPERATION_COMPLETE_IO ||
> - vstor_packet->status != 0)
> + if (vstor_packet->status != 0) {
> + ret = -EINVAL;
> goto cleanup;
> + }
>
>
> memset(vstor_packet, 0, sizeof(struct vstor_packet)); @@ -1745,14
> +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;
> --
> 1.7.4.1
>
> _______________________________________________
> devel mailing list
> devel@linuxdriverproject.org
> http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel


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