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| author | Michael Brown <mcb30@ipxe.org> | 2015-06-25 17:30:49 +0100 |
|---|---|---|
| committer | Michael Brown <mcb30@ipxe.org> | 2015-06-25 17:32:24 +0100 |
| commit | d73982f098db9fdedb28a3826eb97a6832eac1e4 (patch) | |
| tree | 0888168a93e844a54731c3393760371e06649373 /src/net | |
| parent | 94dbfb43746445e91e775c498db89392313934c7 (diff) | |
| download | ipxe-d73982f098db9fdedb28a3826eb97a6832eac1e4.zip ipxe-d73982f098db9fdedb28a3826eb97a6832eac1e4.tar.gz ipxe-d73982f098db9fdedb28a3826eb97a6832eac1e4.tar.bz2 | |
[dhcp] Defer discovery if link is blocked
If the link is blocked (e.g. due to a Spanning Tree Protocol port not
yet forwarding packets) then defer DHCP discovery until the link
becomes unblocked.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/net')
| -rw-r--r-- | src/net/udp/dhcp.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/net/udp/dhcp.c b/src/net/udp/dhcp.c index 8fe2774..61bef99 100644 --- a/src/net/udp/dhcp.c +++ b/src/net/udp/dhcp.c @@ -436,6 +436,15 @@ static void dhcp_discovery_rx ( struct dhcp_session *dhcp, static void dhcp_discovery_expired ( struct dhcp_session *dhcp ) { unsigned long elapsed = ( currticks() - dhcp->start ); + /* If link is blocked, defer DHCP discovery (and reset timeout) */ + if ( netdev_link_blocked ( dhcp->netdev ) ) { + DBGC ( dhcp, "DHCP %p deferring discovery\n", dhcp ); + start_timer_fixed ( &dhcp->timer, + ( DHCP_DISC_START_TIMEOUT_SEC * + TICKS_PER_SEC ) ); + return; + } + /* Give up waiting for ProxyDHCP before we reach the failure point */ if ( dhcp->offer.s_addr && ( elapsed > DHCP_DISC_PROXY_TIMEOUT_SEC * TICKS_PER_SEC ) ) { |