diff options
| author | Michael Brown | 2007-01-18 21:39:17 +0100 |
|---|---|---|
| committer | Michael Brown | 2007-01-18 21:39:17 +0100 |
| commit | c014f607a8ca9bb394d8b8b7fe6638898e29fce7 (patch) | |
| tree | f486c563fed14a2aa7f020965ef47ad41e98e53a /src/net/tcp.c | |
| parent | Move include/malloc.h to include/gpxe/malloc.h, since everything in there (diff) | |
| download | ipxe-c014f607a8ca9bb394d8b8b7fe6638898e29fce7.tar.gz ipxe-c014f607a8ca9bb394d8b8b7fe6638898e29fce7.tar.xz ipxe-c014f607a8ca9bb394d8b8b7fe6638898e29fce7.zip | |
Use total free memory as advertised window. This seems to be sufficient
to avoid drops even on slow NICs.
Diffstat (limited to 'src/net/tcp.c')
| -rw-r--r-- | src/net/tcp.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/net/tcp.c b/src/net/tcp.c index af5f2b06..2311881b 100644 --- a/src/net/tcp.c +++ b/src/net/tcp.c @@ -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 */ |