From: Ferruh Yigit <ferruh.yigit@intel.com>
To: "Min Hu (Connor)" <humin29@huawei.com>,
"dev@dpdk.org" <dev@dpdk.org>,
Thomas Monjalon <thomas@monjalon.net>,
Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Cc: Beilei Xing <beilei.xing@intel.com>,
Qi Zhang <qi.z.zhang@intel.com>,
Raslan Darawsheh <rasland@nvidia.com>,
Haiyue Wang <haiyue.wang@intel.com>,
Viacheslav Ovsiienko <viacheslavo@nvidia.com>
Subject: Re: [dpdk-dev] Question about 'rxm->hash.rss' and 'mb->hash.fdir'
Date: Wed, 30 Jun 2021 10:34:15 +0100 [thread overview]
Message-ID: <50258962-ee1b-e045-aba2-9ef7912a304e@intel.com> (raw)
In-Reply-To: <6ac31917-8ae6-b61f-c0c1-07d907066752@huawei.com>
On 6/30/2021 3:45 AM, Min Hu (Connor) wrote:
> Hi, all
> one question about 'rxm->hash.rss' and 'mb->hash.fdir'.
>
> In Rx recv packets function,
> 'rxm->hash.rss' will report rss hash result from Rx desc.
> 'rxm->hash.fdir' will report filter identifier from Rx desc.
>
> But function implementation differs from some PMDs. for example:
> i40e, MLX5 report the two at the same time if pkt_flags is set,like:
> ******************************************
> if (pkt_flags & PKT_RX_RSS_HASH) {
> rxm->hash.rss =
> rte_le_to_cpu_32(rxd.wb.qword0.hi_dword.rss);
> }
> if (pkt_flags & PKT_RX_FDIR) {
> mb->hash.fdir.hi =
> rte_le_to_cpu_32(rxdp->wb.qword3.hi_dword.fd_id);
> }
> ********************************************
>
> While, ixgbe only report one of the two. like:
> ******************************************
> if (likely(pkt_flags & PKT_RX_RSS_HASH))
> mb->hash.rss = rte_le_to_cpu_32(
> rxdp[j].wb.lower.hi_dword.rss);
> else if (pkt_flags & PKT_RX_FDIR) {
> mb->hash.fdir.hash = rte_le_to_cpu_16(
> rxdp[j].wb.lower.hi_dword.csum_ip.csum) &
> IXGBE_ATR_HASH_MASK;
> mb->hash.fdir.id = rte_le_to_cpu_16(
> rxdp[j].wb.lower.hi_dword.csum_ip.ip_id);
> }
> ********************************************
> So, what is application scenario for 'rxm->hash.rss' and 'mb->hash.fdir',
> that is, why the two should be reported? How about reporting the two at the same
> time?
> Thanks for your reply.
Hi Connor,
mbuf->hash is union, so it is not possible to set both 'hash.rss' & 'hash.fdir'.
I assume for i40e & mlx5 case 'pkt_flags' indicate which one is valid and only
one is set in practice. Cc'ed driver mainteriners for more comment.
next prev parent reply other threads:[~2021-06-30 9:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-30 2:45 Min Hu (Connor)
2021-06-30 9:34 ` Ferruh Yigit [this message]
2021-06-30 11:21 ` Min Hu (Connor)
2021-06-30 11:44 ` Slava Ovsiienko
2021-07-01 0:23 ` Min Hu (Connor)
2021-07-01 1:31 ` Xing, Beilei
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