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| author |   Vitaly Kuznetsov <vkuznets@redhat.com> | 2015-04-11 18:07:58 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-24 12:17:42 -0700 |
| commit | a4d1ee5b0255a135fead1d62a7fc7e6fe718b66e (patch) | |
| tree | b8dd663c221c93ad4655231141b951d2827f461c /drivers/hv/hv_fcopy.c | |
| parent | Drivers: hv: vss: full handshake support (diff) | |
| download | linux-dev-a4d1ee5b0255a135fead1d62a7fc7e6fe718b66e.tar.xz linux-dev-a4d1ee5b0255a135fead1d62a7fc7e6fe718b66e.zip | |
Drivers: hv: fcopy: full handshake support
Introduce FCOPY_VERSION_1 to support kernel replying to the negotiation
message with its own version.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/hv_fcopy.c')
| -rw-r--r-- | drivers/hv/hv_fcopy.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/hv/hv_fcopy.c b/drivers/hv/hv_fcopy.c index 6a8ec9fb0869..b7b528cd481b 100644 --- a/drivers/hv/hv_fcopy.c +++ b/drivers/hv/hv_fcopy.c @@ -62,6 +62,10 @@ static DECLARE_WORK(fcopy_send_work, fcopy_send_data); static const char fcopy_devname[] = "vmbus/hv_fcopy"; static u8 *recv_buffer; static struct hvutil_transport *hvt; +/* + * This state maintains the version number registered by the daemon. + */ +static int dm_reg_value; static void fcopy_timeout_func(struct work_struct *dummy) { @@ -81,8 +85,18 @@ static void fcopy_timeout_func(struct work_struct *dummy) static int fcopy_handle_handshake(u32 version) { + u32 our_ver = FCOPY_CURRENT_VERSION; + switch (version) { - case FCOPY_CURRENT_VERSION: + case FCOPY_VERSION_0: + /* Daemon doesn't expect us to reply */ + dm_reg_value = version; + break; + case FCOPY_VERSION_1: + /* Daemon expects us to reply with our own version */ + if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver))) + return -EFAULT; + dm_reg_value = version; break; default: /* |