* DPDK lacp bonding - xmit hash
@ 2024-09-18 22:20 Vincent
2024-09-18 23:36 ` Stephen Hemminger
0 siblings, 1 reply; 2+ messages in thread
From: Vincent @ 2024-09-18 22:20 UTC (permalink / raw)
To: users
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What determines what xmit_hash_policy DPDK will use for LACP bonded links?
Does it not respect the value specified by
/sys/class/net/<INTERFACE>/bonding/xmit_hash_policy?
Based on testing, it seems like layer2, or layer3+4 hashing is being done,
but the behavior is random, and seems to not necessarily reflect the
current value specified by
/sys/class/net/<INTERFACE>/bonding/xmit_hash_policy.
Thank you,
Vincent
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: DPDK lacp bonding - xmit hash
2024-09-18 22:20 DPDK lacp bonding - xmit hash Vincent
@ 2024-09-18 23:36 ` Stephen Hemminger
0 siblings, 0 replies; 2+ messages in thread
From: Stephen Hemminger @ 2024-09-18 23:36 UTC (permalink / raw)
To: Vincent; +Cc: users
On Wed, 18 Sep 2024 18:20:53 -0400
Vincent <techburgher@gmail.com> wrote:
> What determines what xmit_hash_policy DPDK will use for LACP bonded links?
> Does it not respect the value specified by
> /sys/class/net/<INTERFACE>/bonding/xmit_hash_policy?
>
> Based on testing, it seems like layer2, or layer3+4 hashing is being done,
> but the behavior is random, and seems to not necessarily reflect the
> current value specified by
> /sys/class/net/<INTERFACE>/bonding/xmit_hash_policy.
>
> Thank you,
>
> Vincent
DPDK doesn't use the Linux kernel network interfaces.
The DPDK PMD is a completely separate user mode driver.
https://doc.dpdk.org/guides/prog_guide/link_bonding_poll_mode_drv_lib.html
The similar function DPDK bond PMD is the Balance XOR (Mode 2).
The configuration of the hash type is done via:
rte_eth_bond_xmit_policy_set()
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