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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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@ -62,6 +62,10 @@ static DECLARE_WORK(fcopy_send_work, fcopy_send_data);
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static const char fcopy_devname[] = "vmbus/hv_fcopy";
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static u8 *recv_buffer;
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static struct hvutil_transport *hvt;
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/*
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* This state maintains the version number registered by the daemon.
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*/
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static int dm_reg_value;
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static void fcopy_timeout_func(struct work_struct *dummy)
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{
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@ -81,8 +85,18 @@ static void fcopy_timeout_func(struct work_struct *dummy)
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static int fcopy_handle_handshake(u32 version)
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{
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u32 our_ver = FCOPY_CURRENT_VERSION;
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switch (version) {
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case FCOPY_CURRENT_VERSION:
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case FCOPY_VERSION_0:
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/* Daemon doesn't expect us to reply */
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dm_reg_value = version;
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break;
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case FCOPY_VERSION_1:
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/* Daemon expects us to reply with our own version */
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if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver)))
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return -EFAULT;
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dm_reg_value = version;
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break;
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default:
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/*
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@ -105,7 +105,8 @@ struct hv_vss_msg {
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*/
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#define FCOPY_VERSION_0 0
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#define FCOPY_CURRENT_VERSION FCOPY_VERSION_0
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#define FCOPY_VERSION_1 1
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#define FCOPY_CURRENT_VERSION FCOPY_VERSION_1
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#define W_MAX_PATH 260
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enum hv_fcopy_op {
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@ -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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