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>
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committed by
Greg Kroah-Hartman
parent
cd8dc05485
commit
a4d1ee5b02
@@ -137,6 +137,8 @@ int main(int argc, char *argv[])
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int version = FCOPY_CURRENT_VERSION;
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char *buffer[4096 * 2];
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struct hv_fcopy_hdr *in_msg;
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int in_handshake = 1;
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__u32 kernel_modver;
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static struct option long_options[] = {
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{"help", no_argument, 0, 'h' },
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@@ -191,6 +193,19 @@ int main(int argc, char *argv[])
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syslog(LOG_ERR, "pread failed: %s", strerror(errno));
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exit(EXIT_FAILURE);
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}
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if (in_handshake) {
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if (len != sizeof(kernel_modver)) {
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syslog(LOG_ERR, "invalid version negotiation");
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exit(EXIT_FAILURE);
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}
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kernel_modver = *(__u32 *)buffer;
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in_handshake = 0;
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syslog(LOG_INFO, "HV_FCOPY: kernel module version: %d",
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kernel_modver);
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continue;
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}
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in_msg = (struct hv_fcopy_hdr *)buffer;
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switch (in_msg->operation) {
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