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[netdevice] Allow MTU to be changed at runtime

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Provide a settings applicator to modify netdev->max_pkt_len in
response to changes to the "mtu" setting (DHCP option 26).

Note that as with MAC address changes, drivers are permitted to
completely ignore any changes in the MTU value.  The net result will
be that iPXE effectively uses the smaller of either the hardware
default MTU or the software configured MTU.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2017-01-23 17:47:28 +00:00
parent 4e85b2708f
commit 16aed6e5ce
3 changed files with 67 additions and 3 deletions
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6
src/net/udp/dhcp.c
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@@ -91,9 +91,9 @@ static uint8_t dhcp_request_options_data[] = {
DHCP_PARAMETER_REQUEST_LIST,
DHCP_OPTION ( DHCP_SUBNET_MASK, DHCP_ROUTERS, DHCP_DNS_SERVERS,
DHCP_LOG_SERVERS, DHCP_HOST_NAME, DHCP_DOMAIN_NAME,
DHCP_ROOT_PATH, DHCP_VENDOR_ENCAP, DHCP_VENDOR_CLASS_ID,
DHCP_TFTP_SERVER_NAME, DHCP_BOOTFILE_NAME,
DHCP_DOMAIN_SEARCH,
DHCP_ROOT_PATH, DHCP_MTU, DHCP_VENDOR_ENCAP,
DHCP_VENDOR_CLASS_ID, DHCP_TFTP_SERVER_NAME,
DHCP_BOOTFILE_NAME, DHCP_DOMAIN_SEARCH,
128, 129, 130, 131, 132, 133, 134, 135, /* for PXE */
DHCP_EB_ENCAP, DHCP_ISCSI_INITIATOR_IQN ),
DHCP_END