NET: Add net_busy_flag if CONFIG_USB_KEYBOARD is defined

This flag is to make console aware that NET transfer is running or not.

---
Changes in v2:
1. Change configuration name from CONFIG_CTRLC_POLL_MS to CONFIG_CTRLC_POLL_S.
2. New code will be executed only when CONFIG_CTRLC_POLL_S is defined in configuration header file.
3. Add description in README.console.
Changes in v3:
1. Move changes to common/usb_kbd.c and doc/README.usb
2. Rename config setting to CONFIG_USBKB_TESTC_PERIOD.
3. Remove slow response on USB-keyboard input when TFTP boot is not running.
Changes in v4:
1. Remove changes in doc/README.usb, common/usb_kbd.c and CONFIG_USBKB_TESTC_PERIOD
2. Modify net/net.c
Changes in v5:
1. Change variable name to ctrlc_t_start.
2. Use two calls of get_timer(0) to get time gap.
Changes in v6:
1. In common/usb_kbd.c, check net_busy_flag to determine whether we poll USB keyboard status.
2. In include/usb.h, add external variable declaration net_busy_flag
Changes in v7:
1. Add CONFIG_USB_KEYBOARD
Changes in v8:
1. net/net.c, add __maybe_unused for variable net_busy_flag.
Changes in v9:
None

 net/net.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

index df94789..65daaa0 100644
@@ -207,6 +207,8 @@ static int net_check_prereq(enum proto_t protocol);
 
 static int NetTryCount;
 
+int __maybe_unused net_busy_flag;
+
 /**********************************************************************/
 
 static int on_bootfile(const char *name, const char *value, enum env_op op,

@@ -341,6 +343,9 @@ int NetLoop(enum proto_t protocol)
 		eth_init_state_only(bd);
 
 restart:
+#ifdef CONFIG_USB_KEYBOARD
+	net_busy_flag = 0;
+#endif
 	net_set_state(NETLOOP_CONTINUE);
 
 	/*

@@ -453,6 +458,9 @@ restart:
 		status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 #endif /* CONFIG_MII, ... */
+#ifdef CONFIG_USB_KEYBOARD
+	net_busy_flag = 1;
+#endif
 
 	/*
 	 *	Main packet reception loop.  Loop receiving packets until

@@ -558,6 +566,9 @@ restart:
 	}
 
 done:
+#ifdef CONFIG_USB_KEYBOARD
+	net_busy_flag = 0;
+#endif
 #ifdef CONFIG_CMD_TFTPPUT
 	/* Clear out the handlers */
 	net_set_udp_handler(NULL);

1.7.7

Dear Jim Lin,

Applied, thanks.

Best regards,
Marek Vasut