Re: i40e mbuf->rss indication

From: "Hanoch Haim (hhaim)" <hhaim@cisco.com>
To: Bruce Richardson <bruce.richardson@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: i40e mbuf->rss indication
Date: Thu, 22 Mar 2018 11:46:22 +0000	[thread overview]
Message-ID: <ec9c18bf00824413af21053d27fb1427@XCH-RTP-017.cisco.com> (raw)
In-Reply-To: <20180322113457.GB608@bricha3-MOBL.ger.corp.intel.com>

Driver: i40e

DPDK : 17.11

Configuration : 

1)     RSS configuration 
       rxmode.mq_mode = ETH_MQ_RX_RSS;
       rss->rss_hf = ETH_RSS_UDP | ETH_RSS_TCP;
       rss->rss_key = Microsoft key 
       rss->rss_key_len = 52

       *configure RETA to some rx-queues

2)        Change hash to TOEPLITZ (only for i40e)

          struct rte_eth_hash_filter_info info = {};
          info.info_type = RTE_ETH_HASH_FILTER_GLOBAL_CONFIG;
          info.info.global_conf.hash_func = RTE_ETH_HASH_FUNCTION_TOEPLITZ;
          rte_eth_dev_filter_ctrl(m_repid, 
                                  RTE_ETH_FILTER_HASH,
                                  RTE_ETH_FILTER_SET, &info);

3) Configure some flow-director rules 

4) TCP/UDP packets are received to the *right* core (based on a SW Toeplitz calculation +reta table) however
   The reported rss value is *wrong* in the mbuf 
  (m->hash.rss == *wrong value*)
  ((m->ol_flags&PKT_RX_RSS_HASH) == PKT_RX_RSS_HASH

5) The above works fine for mlx5 and ixgbe

6) I suspect the hash is something else, maybe flow-director id or xor hash ..

Wanted to know if this is a known issue. I can provide a simple way to reproduce it using TRex 

Thanks,
Hanoh

-----Original Message-----
From: Bruce Richardson [mailto:bruce.richardson@intel.com] 
Sent: Thursday, March 22, 2018 1:35 PM
To: Hanoch Haim (hhaim)
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] i40e mbuf->rss indication

On Wed, Mar 21, 2018 at 06:47:22PM +0000, Hanoch Haim (hhaim) wrote:
> Hi All,
> DPDK:17.11
> When i40e is configured with RSS enabled and hash.type=toeplitz
> 
> m->hash.rss = some weird number
> ((m->ol_flags&PKT_RX_RSS_HASH) == PKT_RX_RSS_HASH
> 
> The hash value is correct and match the MS Toeplitz standard.
> 
> Is this expected?

I'm sorry, but I don't quite follow the question, or the problem. Are you meaning to say that the hash value is incorrect, or that the flag is not being set or something else?

/Bruce

> 
> The above works fine with ixgbe/mlx5
> 
> Thanks,
> Hanoh
> 