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[tcp] Report TCP statistics via the "ipstat" command

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Gather some basic statistics on TCP connections to allow out-of-order
packets and duplicate packets to be observed even in non-debug builds.

Report these statistics via the existing "ipstat" command, rather than
introducing a separate "tcpstat" command, on the basis that we do not
need the additional overhead of a separate command.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2026-01-09 16:36:52 +00:00
parent a8c89276cc
commit 2110afb351
3 changed files with 49 additions and 2 deletions
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17
src/include/ipxe/tcp.h
View File

@@ -439,6 +439,23 @@ static inline int tcp_in_window ( uint32_t seq, uint32_t start,
*/
#define TCP_FINISH_TIMEOUT ( 1 * TICKS_PER_SEC )
/** TCP statistics */
struct tcp_statistics {
/** Number of packets received */
unsigned long in_segs;
/** Total number of packets discarded due to lack of memory */
unsigned long in_discards;
/** Total number of packets received out of order */
unsigned long in_out_of_order;
/** Number of octets received (including duplicate data) */
unsigned long in_octets;
/** Number of octets processed and passed to upper layer */
unsigned long in_octets_good;
};
extern struct tcpip_protocol tcp_protocol __tcpip_protocol;
extern struct tcp_statistics tcp_stats;
#endif /* _IPXE_TCP_H */

20
src/net/tcp.c
View File

@@ -167,6 +167,9 @@ struct tcp_rx_queued_header {
*/
static LIST_HEAD ( tcp_conns );
/** TCP statistics */
struct tcp_statistics tcp_stats;
/** Transmit profiler */
static struct profiler tcp_tx_profiler __profiler = { .name = "tcp.tx" };
@@ -1216,6 +1219,9 @@ static int tcp_rx_data ( struct tcp_connection *tcp, uint32_t seq,
/* Acknowledge new data */
tcp_rx_seq ( tcp, len );
/* Update statistics */
tcp_stats.in_octets_good += len;
/* Deliver data to application */
profile_start ( &tcp_xfer_profiler );
if ( ( rc = xfer_deliver_iob ( &tcp->xfer, iobuf ) ) != 0 ) {
@@ -1299,6 +1305,7 @@ static void tcp_rx_enqueue ( struct tcp_connection *tcp, uint32_t seq,
size_t len;
uint32_t seq_len;
uint32_t nxt;
uint32_t gap;
/* Calculate remaining flags and sequence length. Note that
* SYN, if present, has already been processed by this point.
@@ -1330,12 +1337,18 @@ static void tcp_rx_enqueue ( struct tcp_connection *tcp, uint32_t seq,
tcpqhdr->flags = flags;
/* Add to RX queue */
gap = tcp->rcv_ack;
list_for_each_entry ( queued, &tcp->rx_queue, list ) {
tcpqhdr = queued->data;
if ( tcp_cmp ( seq, tcpqhdr->seq ) < 0 )
break;
gap = tcpqhdr->nxt;
}
list_add_tail ( &iobuf->list, &queued->list );
/* Update statistics */
if ( seq != gap )
tcp_stats.in_out_of_order++;
}
/**
@@ -1459,6 +1472,10 @@ static int tcp_rx ( struct io_buffer *iobuf,
seq_len = ( len + ( ( flags & TCP_SYN ) ? 1 : 0 ) +
( ( flags & TCP_FIN ) ? 1 : 0 ) );
/* Update statistics */
tcp_stats.in_segs++;
tcp_stats.in_octets += len;
/* Dump header */
DBGC2 ( tcp, "TCP %p RX %d<-%d %08x %08x..%08x %4zd",
tcp, ntohs ( tcphdr->dest ), ntohs ( tcphdr->src ),
@@ -1569,6 +1586,9 @@ static unsigned int tcp_discard ( void ) {
list_del ( &iobuf->list );
free_iob ( iobuf );
/* Update statistics */
tcp_stats.in_discards++;
/* Report discard */
discarded++;
break;

14
src/usr/ipstat.c
View File

@@ -24,23 +24,25 @@
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdio.h>
#include <ipxe/tcp.h>
#include <ipxe/ipstat.h>
#include <usr/ipstat.h>
/** @file
*
* IP statistics
* TCP/IP statistics
*
*/
/**
* Print IP statistics
* Print TCP/IP statistics
*
*/
void ipstat ( void ) {
struct ip_statistics_family *family;
struct ip_statistics *stats;
/* Print per-family statistics */
for_each_table_entry ( family, IP_STATISTICS_FAMILIES ) {
stats = family->stats;
printf ( "IP version %d:\n", family->version );
@@ -63,4 +65,12 @@ void ipstat ( void ) {
stats->out_mcast_pkts, stats->out_bcast_pkts,
stats->out_octets );
}
/* Print TCP statistics */
printf ( "TCP:\n" );
printf ( " InSegs:%ld InOctets:%ld InOctetsGood:%ld\n",
tcp_stats.in_segs, tcp_stats.in_octets,
tcp_stats.in_octets_good );
printf ( " InDiscards:%ld InOutOfOrder:%ld\n",
tcp_stats.in_discards, tcp_stats.in_out_of_order );
}