[PATCH 2/2] net: lwip: add CONFIG_LWIP_DEBUG_RXTX

[Jerome Forissier]

Add Kconfig symbol LWIP_DEBUG_RXTX to dump the incoming and outgoing
packets when NET_LWIP=y.

Signed-off-by: Jerome Forissier <jerome.forissier at linaro.org>
---
 net/lwip/Kconfig    |  6 ++++++
 net/lwip/net-lwip.c | 14 ++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/net/lwip/Kconfig b/net/lwip/Kconfig
index 40345ced9c9..d28a8a7df94 100644
--- a/net/lwip/Kconfig
+++ b/net/lwip/Kconfig
@@ -10,6 +10,12 @@ config LWIP_DEBUG
 	  Prints messages to the console regarding network packets that go in
           and out of the lwIP library.
 
+config LWIP_DEBUG_RXTX
+	bool "Dump packets sent and received by lwIP"
+	help
+	  Performs an hexadecimal & ASCII dump of the data received and sent by
+	  the lwIP network stack.
+
 config LWIP_ASSERT
 	bool "Enable assertions in the lwIP library"
 	help
diff --git a/net/lwip/net-lwip.c b/net/lwip/net-lwip.c
index 5a2a86686f4..c00a7fe97cd 100644
--- a/net/lwip/net-lwip.c
+++ b/net/lwip/net-lwip.c
@@ -5,6 +5,7 @@
 #include <command.h>
 #include <dm/device.h>
 #include <dm/uclass.h>
+#include <hexdump.h>
 #include <lwip/ip4_addr.h>
 #include <lwip/err.h>
 #include <lwip/netif.h>
@@ -36,6 +37,12 @@ static err_t net_lwip_tx(struct netif *netif, struct pbuf *p)
 	void *pp = NULL;
 	int err;
 
+	if (CONFIG_IS_ENABLED(LWIP_DEBUG_RXTX)) {
+		printf("net_lwip_tx: %u bytes, udev %s\n", p->len, udev->name);
+		print_hex_dump("net_lwip_tx: ", 0, 16, 1, p->payload, p->len,
+			       true);
+	}
+
 	if ((unsigned long)p->payload % PKTALIGN) {
 		/*
 		 * Some net drivers have strict alignment requirements and may
@@ -265,6 +272,13 @@ int net_lwip_rx(struct udevice *udev, struct netif *netif)
 		flags = 0;
 
 		if (len > 0) {
+			if (CONFIG_IS_ENABLED(LWIP_DEBUG_RXTX)) {
+				printf("net_lwip_tx: %u bytes, udev %s \n", len,
+				       udev->name);
+				print_hex_dump("net_lwip_rx: ", 0, 16, 1,
+					       packet, len, true);
+			}
+
 			pbuf = alloc_pbuf_and_copy(packet, len);
 			if (pbuf)
 				netif->input(pbuf, netif);
-- 
2.43.0