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Commands

clearstats port_id

Clear all transmit, receive, and error statistics of all queues associated with a port. The total number of ports attached to a nexus is listed in dev.t4nex.%d.nports and the 0 based port_id identifies a port within this range.

• context ingress ingress_cntxt_id
• context cong ingress_cntxt_id
• context egress egress_cntxt_id
• context fl flm_cntxt_id

Display hardware context for an ingress queue, congestion manager, egress queue, or freelist manager.

ingress_cntxt_id

context id of an ingress queue -- the value listed in one of dev.t4nex.%d.fwq.cntxt_id, dev.cxgbe.%d.rxq.%d.cntxt_id, or dev.cxgbe.%d.ofld_rxq.%d.cntxt_id.

egress_cntxt_id

context id of an egress queue -- the value listed in one of dev.t4nex.%d.mgmtq.cntxt_id, dev.cxgbe.%d.txq.%d.cntxt_id, dev.cxgbe.%d.ctrlq.%d.cntxt_id, dev.cxgbe.%d.ofld_txq.%d.cntxt_id, dev.cxgbe.%d.rxq.%d.fl.cntxt_id, or dev.cxgbe.%d.ofld_rxq.%d.fl.cntxt_id. Note that freelists are egress queues too.

flm_cntxt_id

context id of a freelist manager. The FLM context id is displayed in the egress context dump of a freelist as FLMcontextID.

• hashfilter mode
• filter mode

Display a list of match-criteria available for use in filter rules. A full list of match-criteria known to the chip is in the table below but not all can be used together and the firmware sets up the available parameters based on "filterMode" in the configuration file. Every filter must conform to the filter mode -- multiple match criteria per filter are allowed but only from among those in the current setting of the filter mode. The filter mode for hash filters is a subset of that for normal TCAM filters and depends on the "filterMask" setting in the firmware configuration file. Hash filters do not support masked matches and an exact value for every parameter in the output of "hashfilter mode" (except ipv4/ipv6) must be provided when creating a hash filter.

(Note that mask defaults to all 1s when not provided explicitly. Hash filters do not support masked matches. Also note that many of the items being matched are discrete numeric values rather than bit fields and should be masked with caution.)

Criteria	Usage	Matches if ...
ipv4	type ipv4	incoming packet is an IPv4 datagram.
ipv6	type ipv6	incoming packet is an IPv6 datagram.
sip	sip Ar addr Ns Op / Ns Ar mask	bitwise and of the source address in an incoming IP datagram with mask equals addr Ns . addr can be an IPv4 or IPv6 address.
dip	dip Ar addr Ns Op / Ns Ar mask	bitwise and of the destination address in an incoming IP datagram with mask equals addr Ns . addr can be an IPv4 or IPv6 address.
sport	sport Ar port Ns Op : Ns Ar mask	bitwise and of the source port in an incoming TCP or UDP datagram with mask equals port Ns .
dport	dport Ar port Ns Op : Ns Ar mask	bitwise and of the destination port in an incoming TCP or UDP datagram with mask equals port Ns .
fcoe	fcoe Brq 0 | 1	incoming frame is Fibre Channel over Ethernet(1) or not(0).
iport	iport Ar val Ns Op : Ns Ar mask	bitwise and of the ingress port with mask equals val Ns . The ingress port is a 3 bit number that identifies the port on which a frame arrived. Physical ports are numbered 0-3 and 4-7 are internal loopback paths within the chip. Note that ingress port is not a bit field so it is not always possible to match an arbitrary subset of ingress ports with a single filter rule.
ovlan	ovlan Ar tag Ns Op : Ns Ar mask	bitwise and of the 16-bit outer VLAN tag of an incoming frame with mask equals tag Ns .
vlan	vlan Ar tag Ns Op : Ns Ar mask	bitwise and of the 16-bit VLAN tag of an incoming QinQ frame with mask equals tag Ns . The inner VLAN tag is used if the incoming frame is QinQ.
tos	tos Ar val Ns Op : Ns Ar mask	bitwise and of the 8-bit IP Type of Service/IPv6 Traffic Class in an incoming packet with mask equals val Ns .
proto	proto Ar ipproto Ns Op : Ns Ar mask	bitwise and of the 8-bit IP protocol in an incoming packet with mask equals ipproto Ns .
ethtype	ethtype Ar type Ns Op : Ns Ar mask	bitwise and of the 16-bit Ethernet type field of an incoming frame with mask equals type Ns .
macidx	macidx Ar idx Ns Op : Ns Ar mask	bitwise and of the MAC Address Match Index of an incoming frame with mask equals idx Ns . The MAC Address Match Index refers to an entry in the MPS TCAM or in the MPS hash. See matchtype for more information.
matchtype	matchtype Ar type Ns Op : Ns Ar mask	bitwise and of the Match Type of an incoming frame with mask equals idx Ns . Match Type is one of the following: -tag -width "n" -compact 0 destination MAC in incoming frame is a unicast L2 address that is programmed in the MPS TCAM. macidx can be used to match the index (and thus the MAC address) of the match in the TCAM. 1 destination MAC in incoming frame is a unicast L2 address that "hit" a hash entry in the MPS hash table. macidx can be used to match the index of the entry in the MPS hash table. 2 destination MAC in incoming frame is a multicast L2 address that is programmed in the MPS TCAM. macidx can be used to match the index (and thus the MAC address) of the match in the TCAM. 3 destination MAC in incoming frame is a multicast L2 address that "hit" an entry in the MPS hash table. 4 interface on which incoming frame was received is in promiscuous mode and the destination MAC in the frame is not a broadcast address, and does not match in the MPS TCAM or the MPS hash either. (The frame would have been discarded if the interface wasn't in promiscuous mode.) 5 interface on which incoming frame was received is in promiscuous mode and the destination MAC in the frame is not a broadcast address; it wasn't looked up in the MPS TCAM or the MPS hash because the chip is configured to give precedence to promiscuous mode classification. 6 destination MAC in incoming frame is a broadcast address. 7 Not documented. Do not use.
frag	frag Brq 0 | 1	incoming frame is part of a fragmented IP datagram(1) or not(0).

• hashfilter filter-specification
• filter idx filter-specification

Program a filter.

TCAM filters: The number of available filters is in dev.<nexus>.<instance>.nfilters. idx must be an unused index between 0 and nfilters - 1. IPv6 filters consume 4 consecutive entries on T4/T5 and 2 on T6 and idx must be aligned to 4 or 2 in this case.

Hash filters: These reside in the card's memory instead of its TCAM and are enabled with a special configuration file that is selected with hw.cxgbe.config_file="hashfilter" in loader.conf. There are at least half a million filters available with the sample config shipped with the driver. Note that the hardware selects the index for a hashfilter and this index is displayed when the filter is created. Hash and TCAM filters can be used together.

filter-specification consists of one or more matches (see Usage in the table above) to try against an incoming frame, an action to perform when all matches succeed, and some additional operational parameters. Hashfilters require an exact value for the 5-tuple (sip, dip, sport, dport, proto) and for any other match-criteria listed in "hashfilter mode". Possible filter actions are drop, pass, or switch.

Operational parameters that can be used with all filters:

hitcnts

Count filter hits: 0 or 1 (default).

prio

Filter has priority over active and server regions of TCAM: 0 (default) or 1.

Operational parameters that can be used with filters with action pass:

queue

Context id of an ingress queue to which to deliver the packet. The context id is available in dev.cxgbe.%d.rxq.%d.cntxt_id. By default, packets that hit a filter with action pass are delivered based on their RSS hash as usual. Use this to steer them to a particular queue.

rpttid

Report the filter tid instead of the RSS hash in the rx descriptor. 0 (default) or 1.

tcbhash

Select TCB hash information in rx descriptor. 0 (default) or 1

Operational parameters that can be used with filters with action switch:

eport

Egress port number on which to send the packet matching the filter. 0 to dev.<nexus>.<instance>.nports - 1.

dmac

Replace packet destination MAC address with the one provided before switching it out of eport.

smac

Replace packet source MAC address with the one provided before switching it out of eport.

swapmac

Swap packet source and destination MAC addresses before switching it out of eport.

vlan

Insert, remove, or rewrite the VLAN tag before switching the packet out of eport. none removes the tag, =tag replaces the existing tag with the one provided, and +tag inserts the given tag into the frame.

nat

Specify the desired NAT mode. Valid NAT modes values are:

dip

Perform NAT on destination IP.

dip-dp

Perform NAT on destination IP, destination port.

dip-dp-sip

Perform NAT on destination IP, destination port, source IP.

dip-dp-sp

Perform NAT on destination IP, destination port, source port.

sip-sp

Perform NAT on source IP, source port.

dip-sip-sp

Perform NAT on destination IP, source IP, source port.

all

Perform NAT on all 4-tuple fields.

natflag

Perform NAT only on segments which do not have TCP FIN or RST set.

natseq

Perform NAT only if incoming segment's sequence number + payload length is less than this supplied value.

nat_dip

Perform NAT using this destination IP.

nat_sip

Perform NAT using this source IP.

nat_dport

Perform NAT using this destination port.

nat_sport

Perform NAT using this source port. Perform NAT only if incoming segment's sequence number + payload length is less than this supplied value.

• hashfilter idx delete
• filter idx delete

Delete filter that is at the given index.

filter list

List all filters programmed into the hardware.

i2c port_id devaddr addr [len]

loadcfg fw-config.txt

Install the firmware configuration file contained in fw-config.txt to the card. Set hw.cxgbe.config_file="flash" in loader.conf to get cxgbe(4) to use the on-flash configuration.

loadcfg clear

Erase configuration file from the card.

loadfw fw-image.bin

Install the firmware contained in fw-image.bin to the card.

memdump addr len

Display len bytes of data of the card's memory starting at addr. The card's memory map is available in dev.t4nex.%d.misc.meminfo.

policy cop.txt

Install the Connection Offload Policy (COP) in cop.txt. A COP offers fine-grained control over which connections get offloaded and with what parameters. Set hw.cxgbe.cop_managed_offloading="1" in loader.conf to ensure that t4_tom will not offload any connection before a COP is installed. Note that t4_tom must be loaded and operational (IFCAP_TOE enabled) as always for any kind of offload based on the hardware TOE.

COP installed	cop_managed_offloading	Behavior
NO	0	offload all [Default]
NO	1	no offload
YES	Don't Care	Rule based offload

The policy file consists of empty lines, comments (lines begining with #) and any number of rules. Rules are applied in the order they appear in the file and processing stops at the first match. There is an implicit rule that disables offload for connections that do not match anything in the policy.

Each rule consists of a filter part, which determines what connections the rule applies to, and a settings part, which determines whether whether matching connections will be offloaded and, if so, with what settings. The general form of a rule is

[ socket-type ] pcap-filter => settings

socket-type is one of the following.

A

Active open. Connection is being opened by this host.

P

Passive open. Connection was requested by a peer.

L

Listen called on a socket. Disabling offload in such a rule will prevent a hardware listener from being started.

D

Don't care. Matches all of the above.

pcap-filter is an expression that follows the pcap-filter(7) syntax, or it is the keyword all that matches everything.

settings determine whether connections matching socket-type and pcap-filter are offloaded and optionally sets some per-connection properties if they are. A combination of the following is allowed.

offload

Connection should be offloaded. Use !offload or not offload to disable offload instead.

coalesce

Enable rx payload coalescing. Negate to disable.

timestamp

Enable TCP timestamp option. Negate to disable.

sack

Enable TCP Selective Acknowledgements (SACK). Negate to disable.

nagle

Enable Nagle's algorithm. Negate to disable.

ecn

Enable Explicit Congestion Notification (ECN). Negate to disable.

ddp

Use Direct Data Placement (zero copy receive) and zero copy transmit on the connection to service AIO requests on the socket. Negate to disable.

tls

Set ULP mode to ULP_MODE_TLS.

cong algo

Use the specified congestion control algorithm. algo must be one of reno, tahoe, newreno, or highspeed.

class sc

Bind the connection to the specified tx scheduling class. Valid range is 0 to 14 (for T4) and 0 to 15 (T5 onwards).

rxq qid

Use the specified offload rx queue. qid should be between 0 and nofldrxq for the ifnet.

txq qnum

Use the specified offload tx queue. qid should be between 0 and nofldtxq for the ifnet.

bind qnum

Shorthand for rxq qnum txq qnum. Use only when nofldrxq is the same as nofldtxq.

mss val

Set the advertised TCP MSS in the SYN for this connection to val (in bytes). The hardware MTU table must already have an entry that is suitable for the MSS.

Example of a COP.

Note that hardware listener for port 22 will be IPv4 only because the rule before it will prevent any IPv6 servers other than the first two. Also note that outgoing connections to 192.168/16 are the only outgoing connections that will get offloaded.

[L] port 80 => offload
[L] port 443 => offload
[L] ip6 => !offload
[L] port 22 => offload
[P] dst port 80 => offload cong highspeed !sack !ecn
[P] dst port 443 => offload tls
[A] dst net 192.168/16 => offload
[A] all => !offload
[D] port 22 => offload !nagle

policy clear

Remove the Connection Offload Policy (COP) if one is in use.

{reg | reg64} addr[=val]

regdump [register-block ...]

Display contents of device registers. One or more register-block can be specified to limit the registers displayed. The default is to display registers for all blocks. Registers with read side effects are not read during a regdump operation. register-block can be sge pci dbg mc ma edc0 edc1 cim tp ulp_rx ulp_tx pmrx pmtx mps cplsw smb i2c mi uart pmu sf pl le ncsi xgmac.

sched-class config [param value]

Configure optional feature capabilities for the TX scheduler.

type scheduler-type

Use packet for the packet scheduler.

minmax value

A non-zero value will enable "minmax" mode; a zero value will disable "minmax" mode.

NOTE: Many (most) of the parameters and constraints are adapter-specific - for instance the number of channels and classes which are available whether various modes are implemented, etc. Consult the adapter documentation for specific information on any limitations.

sched-class params [param value]

Configure parameters for a scheduling class.

type scheduler-type

Use packet for packet scheduler.

level scheduler-hierarchy-level

The "level" within the scheduling hierarchy which is being programed:

cl-rl

Class Rate Limiting.

cl-wrr

Class Weighted Round Robin.

ch-rl

Channel Rate Limiting.

mode scheduler-mode

The mode in which the scheduling class is going to operate:

class

All of the "flows" bound to the scheduling class will be held to aggregate scheduling constraints.

flow

Each of the "flows" bound to the scheduling class will be held to the scheduling constraints.

E.g. if the scheduling class has a TX bandwidth of 10Mb/s, in class mode, all of the "flows" bound to the class would be limited to an aggregate bandwidth of 10Mb/s; but in flow mode, each of the "flows" bound to the scheduling class would be limited to 10Mb/s.

rate-unit scheduler-rate-unit

The units of the scheduler rate constraints:

bits

bit rate in Kb/s.

pkts

packets/s.

rate-mode scheduler-rate-mode

The mode of the scheduler rate constraints:

relative

percent of port rate.

absolute

Kb/s.

channel scheduler-channel-index

The scheduling channel to which the scheduling class will be bound.

class scheduler-class-index

The scheduling class being programmed.

min-rate minimum-rate

The minimum guaranteed rate to which a rate-limiting scheduling class hierarchy will have access.

max-rate maximum-rate

The maximum rate for a rate-limiting scheduling class hierarchy.

weight round-robin-weight

The weight to be used for a weighted-round-robin scheduling hierarchy.

pkt-size average-packet-size

The average packet size will be used to compute scheduler constraints for a rate-limited scheduler class hierarchy.

NOTE: Many (most) of the parameters and constraints are adapter-specific - for instance the number of channels and classes which are available, whether various modes are implemented, etc. Consult the adapter documentation for specific information on any limitations.

sched-queue port queue class

Bind the indicated port's NIC TX queue to the specified TX Scheduler class. If the TX queue is all, * or any negative value, the binding will apply to all of the TX queues associated with the interface. If the class is unbind, clear or any negative value, the TX queue(s) will be unbound from any current TX Scheduler Class binding.

stdio

Switch to interactive mode.

tcb tid

Display contents of the hardware TCB (TCP Control Block) for the connection identfied by tid.