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net: Add option for tracing packets

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Add an option to trace all packets send/received. This can be helpful when
debugging protocol issues, as the packets can then be imported into
wireshark [1] and analyzed further.

[1] https://www.wireshark.org/docs/wsug_html_chunked/ChIOImportSection.html

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Sean Anderson 2023-10-07 21:53:12 -04:00 committed by Tom Rini
parent a56e30e65f
commit 798962cedd
2 changed files with 7 additions and 0 deletions
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4
include/net.h
View file

@ -16,6 +16,7 @@
#include <asm/cache.h>
#include <asm/byteorder.h> /* for nton* / ntoh* stuff */
#include <env.h>
#include <hexdump.h>
#include <log.h>
#include <time.h>
#include <linux/if_ether.h>
@ -29,6 +30,7 @@ struct udevice;
#define DEBUG_DEV_PKT 0 /* Packets or info directed to the device */
#define DEBUG_NET_PKT 0 /* Packets on info on the network at large */
#define DEBUG_INT_STATE 0 /* Internal network state changes */
#define DEBUG_NET_PKT_TRACE 0 /* Trace all packet data */
/*
* The number of receive packet buffers, and the required packet buffer
@ -640,6 +642,8 @@ uchar * net_get_async_tx_pkt_buf(void);
/* Transmit a packet */
static inline void net_send_packet(uchar *pkt, int len)
{
if (DEBUG_NET_PKT_TRACE)
print_hex_dump_bytes("tx: ", DUMP_PREFIX_OFFSET, pkt, len);
/* Currently no way to return errors from eth_send() */
(void) eth_send(pkt, len);
}

3
net/net.c
View file

@ -1201,6 +1201,9 @@ void net_process_received_packet(uchar *in_packet, int len)
ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
debug_cond(DEBUG_NET_PKT, "packet received\n");
if (DEBUG_NET_PKT_TRACE)
print_hex_dump_bytes("rx: ", DUMP_PREFIX_OFFSET, in_packet,
len);
#if defined(CONFIG_CMD_PCAP)
pcap_post(in_packet, len, false);