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From: Thomas Monjalon <thomas@monjalon.net>
To: Huisong Li <lihuisong@huawei.com>
Cc: dev@dpdk.org, ferruh.yigit@intel.com
Subject: Re: [dpdk-dev] Questions about reporting auto-negotiation capability
Date: Mon, 29 Mar 2021 09:03:28 +0200
Message-ID: <9105928.7imIDBDKWL@thomas> (raw)
In-Reply-To: <2a9f3c44-44da-854b-8b25-772a3570baa4@huawei.com>

29/03/2021 06:02, Huisong Li:
> Hi, all
> 
>          'speed_capa' in struct rte_eth_dev_info is defined as follows:
> 
> uint32_t speed_capa;  /**< Supported speeds bitmap (ETH_LINK_SPEED_). */
> 
> 
>        Most PMD drivers use this field to report the speeds capability 
> supported by the device to the upper-layer app.
> 
> But it seems that few NICs report their auto-negotiation capability 
> through this field. If NIC also uses it to report
> 
> their auto-negotiation capability through this field, and should set it 
> to ETH_LINK_SPEED_AUTONEG(0) based on
> 
> the definition of ETH_LINK_SPEED_xxx. In this case, it conflicts the 
> report of the speeds capability .
> 
> 
> I don't know how to correctly report the auto-negotiation capability of 
> the device. Thanks for your reply.

ETH_LINK_SPEED_AUTONEG is not for capabilities.
Anyway, if it is set, it changes nothing (0) in the bitmap.
I see mlx5 is wrongly using it.

speed_capa is only for enumerating speeds.



  reply	other threads:[~2021-03-29  7:03 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-29  4:02 Huisong Li
2021-03-29  7:03 ` Thomas Monjalon [this message]
2021-03-29  7:19   ` Thomas Monjalon
2021-03-29 11:44     ` Huisong Li
2021-03-29 12:05       ` Thomas Monjalon
2021-03-29 14:18     ` Ajit Khaparde
2021-03-29  7:28 ` [dpdk-dev] [PATCH] drivers/net: remove useless autoneg capability Thomas Monjalon
2021-03-29 14:12   ` Ajit Khaparde
2021-04-01 13:26     ` Ferruh Yigit

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