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Be advised that as of MLNX_OFED v2.0-3.0.0, the parameters (both the value and the

mask) should be set in big-endian format.

Features Overview and ConfigurationRev 2.3-1.0.1

Mellanox Technologies

Each header struct holds the relevant network layer parameters for matching. To enforce the match, the

user sets a mask for each parameter. The supported masks are:

• All one mask - include the parameter value in the attached rule

Note: Since the

VLAN ID in the Ethernet header is 12bit long, the following parameter should be

used: flow_spec_eth.mask.vlan_tag = htons(0x0fff).

• All zero mask - ignore the parameter value in the attached rule

When setting the flow type to NORMAL, the incoming traffic will be steered according to the rule spec-

ifications. ALL_DEFAULT and MC_DEFAULT rules options are valid only for Ethernet link type since

InfiniBand link type packets always include QP number

For further information, please refer to the relevant man pages.

• ibv_exp_destroy_flow

int ibv_

exp_

destroy_flow(struct ibv_

exp_

flow *flow_id)

Input parameters:

ibv_exp_destroy_flow requires struct ibv_exp_flow which is the return value of

ibv_exp_create_flow in case of success.

Output parameters:

Returns 0 on success, or the value of errno on failure.

For further information, please refer to the

ibv_exp_destroy_flow man page.

• Ethtool

Ethtool domain is used to attach an RX ring, specifically its QP to a specified flow.

Please refer to the most recent ethtool manpage for all the ways to specify a flow.

Examples:

• ethtool –U eth5 flow-type ether dst 00:11:22:33:44:55 loc 5 action 2

All packets that contain the above destination MAC address are to be steered into rx-ring 2 (its

underlying QP), with priority 5 (within the ethtool domain)

• ethtool –U eth5 flow-type tcp4 src-ip 1.2.3.4 dst-port 8888 loc 5 action 2

All packets that contain the above destination IP address and source port are to be steered into rx-

ring 2.

When destination MAC is not given, the user's destination MAC is filled automatically.

• ethtool -U eth5 flow-type ether dst 00:11:22:33:44:55 vlan 45 m 0xf000 loc 5 action 2

All packets that contain the above destination MAC address and specific VLAN are steered into

ring 2. Please pay attention to the

VLAN's mask 0xf000. It is required in order to add such a rule.

• ethtool –u eth5

Shows all of ethtool’s steering rule

When configuring two rules with the same priority, the second rule will overwrite the first one,

so this ethtool interface is ef

fectively a table. Inserting Flow Steering rules in the kernel

requires support from both the ethtool in the user space and in kernel (v2.6.28).

MLX4 Driver Support