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rte_flow_action_rss(3) DPDK rte_flow_action_rss(3)

NAME

rte_flow_action_rss

SYNOPSIS

#include <rte_flow.h>

Data Fields


enum rte_eth_hash_function func
uint32_t level
uint64_t types
uint32_t key_len
uint32_t queue_num
const uint8_t * key
const uint16_t * queue

Detailed Description

RTE_FLOW_ACTION_TYPE_RSS

Similar to QUEUE, except RSS is additionally performed on packets to spread them among several queues according to the provided parameters.

Unlike global RSS settings used by other DPDK APIs, unsetting the types field does not disable RSS in a flow rule. Doing so instead requests safe unspecified 'best-effort' settings from the underlying PMD, which depending on the flow rule, may result in anything ranging from empty (single queue) to all-inclusive RSS.

Note: RSS hash result is stored in the hash.rss mbuf field which overlaps hash.fdir.lo. Since the MARK action sets the hash.fdir.hi field only, both can be requested simultaneously.

Definition at line 3243 of file rte_flow.h.

Field Documentation

enum rte_eth_hash_function func

RSS hash function to apply.

Definition at line 3224 of file rte_flow.h.

uint32_t level

Packet encapsulation level RSS hash types apply to.

•
0 requests the default behavior. Depending on the packet type, it can mean outermost, innermost, anything in between or even no RSS.

It basically stands for the innermost encapsulation level RSS can be performed on according to PMD and device capabilities.

  • 1 requests RSS to be performed on the outermost packet encapsulation level.
  • 2 and subsequent values request RSS to be performed on the specified inner packet encapsulation level, from outermost to innermost (lower to higher values).

Values other than 0 are not necessarily supported.

Requesting a specific RSS level on unrecognized traffic results in undefined behavior. For predictable results, it is recommended to make the flow rule pattern match packet headers up to the requested encapsulation level so that only matching traffic goes through.

Definition at line 3270 of file rte_flow.h.

uint64_t types

Specific RSS hash types (see RTE_ETH_RSS_*).

Definition at line 3271 of file rte_flow.h.

uint32_t key_len

Hash key length in bytes.

Definition at line 3272 of file rte_flow.h.

uint32_t queue_num

Number of entries in queue.

Definition at line 3273 of file rte_flow.h.

const uint8_t* key

Hash key.

Definition at line 3274 of file rte_flow.h.

const uint16_t* queue

Queue indices to use.

Definition at line 3275 of file rte_flow.h.

Author

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Fri Dec 15 2023 Version 23.11.0