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Use total free memory as advertised window. This seems to be sufficient

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to avoid drops even on slow NICs.
This commit is contained in:
Michael Brown
2007-01-18 20:39:17 +00:00
parent 6d4e37cf42
commit c014f607a8
3 changed files with 31 additions and 29 deletions
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12
src/net/tcp.c
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@@ -6,6 +6,7 @@
#include <timer.h>
#include <vsprintf.h>
#include <gpxe/pkbuff.h>
#include <gpxe/malloc.h>
#include <gpxe/retry.h>
#include <gpxe/tcpip.h>
#include <gpxe/tcp.h>
@@ -265,6 +266,7 @@ static int tcp_senddata_conn ( struct tcp_connection *conn, int force_send ) {
unsigned int flags;
size_t len;
size_t seq_len;
size_t window;
int rc;
/* Allocate space to the TX buffer */
@@ -322,6 +324,12 @@ static int tcp_senddata_conn ( struct tcp_connection *conn, int force_send ) {
if ( seq_len )
start_timer ( &conn->timer );
/* Estimate window size */
window = freemem;
if ( window > TCP_MAX_WINDOW_SIZE )
window = TCP_MAX_WINDOW_SIZE;
window &= ~0x03; /* Keep everything dword-aligned */
/* Fill up the TCP header */
payload = pkb->data;
if ( flags & TCP_SYN ) {
@@ -338,7 +346,7 @@ static int tcp_senddata_conn ( struct tcp_connection *conn, int force_send ) {
tcphdr->ack = htonl ( conn->rcv_ack );
tcphdr->hlen = ( ( payload - pkb->data ) << 2 );
tcphdr->flags = flags;
tcphdr->win = htons ( TCP_WINDOW_SIZE );
tcphdr->win = htons ( window );
tcphdr->csum = tcpip_chksum ( pkb->data, pkb_len ( pkb ) );
/* Dump header */
@@ -492,7 +500,7 @@ static int tcp_send_reset ( struct tcp_connection *conn,
tcphdr->ack = in_tcphdr->seq;
tcphdr->hlen = ( ( sizeof ( *tcphdr ) / 4 ) << 4 );
tcphdr->flags = ( TCP_RST | TCP_ACK );
tcphdr->win = htons ( TCP_WINDOW_SIZE );
tcphdr->win = htons ( TCP_MAX_WINDOW_SIZE );
tcphdr->csum = tcpip_chksum ( pkb->data, pkb_len ( pkb ) );
/* Dump header */