Devlink

The Linux devlink subsystem provides a flexible and easy to use subsystem for exposing a list of frames that can be trapped by the device, as well as a special list of frames that will be dropped.

Devlink

devlink is a device configuration utility, that consists of a list of sub-applications. The Prestera driver utilizes only some of devlink's functionality.

Devlink dev

Device-specific configuration and information:

• List all registered devices in the devlink subsystem: devlink dev show

• List all the device information (such as bus/id, driver that controls the device, versions, firmware version that is currently loaded): devlink dev info

Devlink port

Port-specific configuration and information:

• List all the device ports that are registered in the devlink subsystem: devlink port show

Devlink trap

Information about devlink traps and drops that are configured by the device:

• List all traps that are registered within the system: devlink trap show

• List all trap groups that are registered within the system: devlink trap group show

Devlink traps registered by the Prestera driver

The Prestera driver registers a set of traps that show what frames the device can trap to the CPU (trap action), as well as a special set of frames that are dropped (drop action). The traps are assembled into different groups, which makes it easier to view per-group traps, or per-groups statistics.

The Prestera driver registers the following groups (traps within these groups):

l2-drops

Trap name	Descripton	Type	Action on init
local_port	Packets dropped due to FDB decision to bridge packet back to the incoming port/trunk	Drop	Drop
invalid_sa	Frame with invalid source address	Drop	Drop

l3-drops

Trap name	Descripton	Type	Action on init
illegal_ip_addr	Packet with illegal IPV4 address	Drop	Drop
illegal_ip_hdr	Packet with invalid IPV4 header	Drop	Drop
ip_uc_dip_da_mismatch	Packet with destination MAC unicast, and destination IPV4 address multicast	Drop	Drop
ip_uc_dip_da_mismatch	Packet with zero source IPV4 address	Drop	Drop

l3-exceptions

Trap name	Descripton	Type	Action on init
mtu_error	Packet with too big MTU	Exception	Trap
ttl_error	Packet with zero TTL	Exception	Trap
ttl_error	Packet with invalid IPV4 header options field	Exception	Trap
ipv4_icmp_redirect	IPV4 ICMP redirect packet	Exception	Trap

neigh-discovery

Trap name	Descripton	Type	Action on init
arp_bc	ARP broadcast frames	Control	Trap
arp_response	ARP response frames	Control	Trap

acl_trap

Trap name	Descripton	Type	Action on init
acl_code_0	Frames trapped due to ACL configuration, hw TC #0	Control	Trap
acl_code_1	Frames trapped due to ACL configuration, hw TC #1	Control	Trap
acl_code_2	Frames trapped due to ACL configuration, hw TC #2	Control	Trap
acl_code_3	Frames trapped due to ACL configuration, hw TC #3	Control	Trap
acl_code_4	Frames trapped due to ACL configuration, hw TC #4	Control	Trap
acl_code_5	Frames trapped due to ACL configuration, hw TC #5	Control	Trap
acl_code_6	Frames trapped due to ACL configuration, hw TC #6	Control	Trap
acl_code_7	Frames trapped due to ACL configuration, hw TC #7	Control	Trap

ospf

Trap name	Descripton	Type	Action on init
ospf	OSPF frames	Control	Trap

stp

Trap name	Descripton	Type	Action on init
stp	STP frames	Control	Trap

lacp

Trap name	Descripton	Type	Action on init
lacp	LACP frames	Control	Trap

lldp

Trap name	Descripton	Type	Action on init
lldp	LLDP frames	Control	Trap

vrrp

Trap name	Descripton	Type	Action on init
vrrp	VRRP frames	Control	Trap

dhcp

Trap name	Descripton	Type	Action on init
dhcp	DHCP frames	Control	Trap

bgp

Trap name	Descripton	Type	Action on init
bgp	BGP frames	Control	Trap

local_delivery

Trap name	Descripton	Type	Action on init
is_is	IS-IS frames	Control	Trap
ip_bc_mac	IPV4 packets with broadcast destination address	Control	Trap
router_mc	IPV4 packets with all router multicast (224.0.0.2) destination address	Control	Trap
mac_to_me	Frame with destination MAC address that is the switchport MAC address	Control	Trap
ip_default_route	IPV4 packets with destination address that is not the address of the switchport interface, and there is no forwarding prefix	Control	Trap
local_route	IPV4 packets with destination address being switchport's IP address	Control	Trap
ssh	SSH packets	Control	Trap
telnet	Telnet packets	Control	Trap
ICMP	ICMP packets	Control	Trap

NOTE: prestera driver does not support changing action of traps either upon init or at rutime.