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From: Lance Richardson <lance.richardson@broadcom.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>
Cc: Ajit Khaparde <ajit.khaparde@broadcom.com>,
	Somnath Kotur <somnath.kotur@broadcom.com>,
	dev@dpdk.org, stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH 02/12] net/bnxt: fix rxq/txq get information
Date: Fri, 18 Sep 2020 14:41:22 -0400	[thread overview]
Message-ID: <CADyeNEDsAM+CqD8WYyj_GhWPfv_=-2saR_dTvFfuQQgtdDxVMQ@mail.gmail.com> (raw)
In-Reply-To: <b561da43-3e8e-1a98-09c7-c2d18b34b218@intel.com>

On Fri, Sep 11, 2020 at 10:41 AM Ferruh Yigit <ferruh.yigit@intel.com> wrote:
> > -     qinfo->conf.rx_drop_en = 0;
> > +     qinfo->conf.rx_drop_en = 1;
> Why 0 is wrong but 1 is correct?
> Technically 'rx_drop_en' is a user configuration, which is set via
> 'rte_eth_rx_queue_setup()' API.
> bnxt seems not honoring this config option at all.
> Based on HW capability, I think two things can be done,
> 1) Configure the HW based on config request, and return configured value in
> 'bnxt_rxq_info_get_op()'. see 'ixgbe'.
> 2) If HW is not configurable, check the value in 'rte_eth_rx_queue_setup()'
> a) return error if unsupported value requested. see 'sfc'.
> b) log a warning and overwrite the requested config with whatever supported.
> And for both a & b, return current config in the 'bnxt_rxq_info_get_op()'
> >       qinfo->conf.rx_deferred_start = rxq->rx_deferred_start;
> > +     qinfo->conf.offloads = dev->data->dev_conf.rxmode.offloads;
Hi Ferruh,

Apologies, this somehow didn't make it to my inbox.

I believe case (2) applies here, rx_drop_en is not currently configurable in hw,
so this change was intended to accurately report the effective value. I'm not
sure whether (2a) or (2b) would be better, but (2b) seems less likely to cause
issues for existing applications.

> This is for queue specific offloads, you are returning port offloads.
> As far as I can see bnxt doesn't have any queue specific offload, so this can be
> dropped.

It wasn't clear to me whether this was intended to report the difference between
the offload configuration for the queue and the offload configuration
for the port
or the effective offload configuration for the queue. I noticed that
several other
PMDs (e.g. mlx5, netvsc, sfc) report the offload configuration for the port in
rx/tx_queue_info_get(). The sfc PMD reports the offload configuration for the
port combined with queue-specific offloads, based on those examples this
seemed to be correct. I guess you're saying those are also incorrect?


  reply	other threads:[~2020-09-18 18:41 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-09 15:52 [dpdk-dev] [PATCH 00/12] net/bnxt: vector PMD improvements Lance Richardson
2020-09-09 15:52 ` [dpdk-dev] [PATCH 01/12] net/bnxt: fix burst mode get for Arm Lance Richardson
2020-09-09 15:52 ` [dpdk-dev] [PATCH 02/12] net/bnxt: fix rxq/txq get information Lance Richardson
2020-09-11 14:41   ` Ferruh Yigit
2020-09-18 18:41     ` Lance Richardson [this message]
2020-09-21 11:05       ` Ferruh Yigit
2020-09-09 15:52 ` [dpdk-dev] [PATCH 03/12] net/bnxt: use appropriate type for Rx mbuf ring Lance Richardson
2020-09-09 15:52 ` [dpdk-dev] [PATCH 04/12] net/bnxt: require async cq for vector mode Lance Richardson
2020-09-11 15:02   ` Ferruh Yigit
2020-09-11 15:07     ` Lance Richardson
2020-09-09 15:52 ` [dpdk-dev] [PATCH 05/12] net/bnxt: improve support for small ring sizes Lance Richardson
2020-09-14 22:03   ` Ferruh Yigit
2020-09-15 14:12     ` Lance Richardson
2020-09-09 15:52 ` [dpdk-dev] [PATCH 06/12] net/bnxt: use smaller cq when agg ring not needed Lance Richardson
2020-09-09 15:53 ` [dpdk-dev] [PATCH 07/12] net/bnxt: increase max burst size for vector mode Lance Richardson
2020-09-11 15:19   ` Ferruh Yigit
2020-09-11 15:38     ` Lance Richardson
2020-09-11 15:56       ` Ferruh Yigit
2020-09-09 15:53 ` [dpdk-dev] [PATCH 08/12] net/bnxt: use table-based packet type translation Lance Richardson
2020-09-09 15:53 ` [dpdk-dev] [PATCH 09/12] net/bnxt: table-based handling for ol flags Lance Richardson
2020-09-11  3:42 ` [dpdk-dev] [PATCH 00/12] net/bnxt: vector PMD improvements Ajit Khaparde
2020-09-11 15:58   ` Ferruh Yigit

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