[PATCH] Intel iavf: Return in the case of ADD/DEL ETH address

[Zhang, Qi Z]

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Sorry I have to reject this patch, as a device agnostic driver, iavf can't just simply assume kernel PF driver don't support VIRTCHNL_OP_DEL_ETH_ADDR and VIRTCHNL_OP_ADD_ETH_ADDR.
A better solution is to introduce some VF/PF negotiation during init or learning from runtime.(if get an unsupported error from PF after the first call)



From: Vipin P R <vipinp at vmware.com> 
Sent: Tuesday, February 7, 2023 6:43 PM
To: Zhang, Qi Z <qi.z.zhang at intel.com>; Wu, Jingjing <jingjing.wu at intel.com>; Xing, Beilei <beilei.xing at intel.com>
Cc: dev at dpdk.org; stable at dpdk.org
Subject: Re: [PATCH] Intel iavf: Return in the case of ADD/DEL ETH address



________________________________________
From: Zhang, Qi Z <mailto:qi.z.zhang at intel.com>
Sent: 17 January 2023 07:24
To: Vipin P R <mailto:vipinp at vmware.com>; Wu, Jingjing <mailto:jingjing.wu at intel.com>; Xing, Beilei <mailto:beilei.xing at intel.com>
Cc: mailto:dev at dpdk.org <mailto:dev at dpdk.org>; mailto:stable at dpdk.org <mailto:stable at dpdk.org>
Subject: RE: [PATCH] Intel iavf: Return in the case of ADD/DEL ETH address 
 
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> -----Original Message-----
> From: Vipin P R <mailto:vipinp at vmware.com>
> Sent: Friday, January 13, 2023 9:19 PM
> To: Wu, Jingjing <mailto:jingjing.wu at intel.com>; Xing, Beilei <mailto:beilei.xing at intel.com>
> Cc: mailto:dev at dpdk.org; Vipin P R <mailto:vipinp at vmware.com>; mailto:stable at dpdk.org
> Subject: [PATCH] Intel iavf: Return in the case of ADD/DEL ETH address
>
> In case of i40vf, VIRTCHNL_OP_DEL_ETH_ADDR and
> VIRTCHNL_OP_ADD_ETH_ADDR are unsupported.
> i40evf_execute_vf_cmd is invoked with these operations as part of
> i40evf_set_mc_addr_list()
>
> The cases are not handled in i40evf_execute_vf_cmd() thus hitting the
> default case.
> There is a retry logic of upto 200 times (2000 in iavf) with a delay of 10ms (1ms
> in iavf).
> This results in a needless delay of 2s in the init phase for each VNIC.
>


Sorry I didn't get this, why this is related with i40evf? I40evf PMD has been replaced by iavf PMD.
The iavf PMD works with both i40e and ice, does this will break ice's usage?

Hi, this is problem was discovered while using i40vf (which was deprecated and replaced by iavf). Upon inspecting the code, this problem would also be hit in iavf, if the VIRTCHNL_OP_DEL_ETH_ADDR and VIRTCHNL_OP_ADD_ETH_ADDR are not supported.


> The patch aims to rectify that delay.
> In fe2a571c70cc397f2ad4e280f8d084148fea5d62, i40e_ethdev_vf.c was
> deleted. Hence adding this in iavf_vchnl.c.
>
> Cc: mailto:stable at dpdk.org
>
> Signed-off-by: Vipin P R <mailto:vipinp at vmware.com>
> ---
>  drivers/net/iavf/iavf_vchnl.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/net/iavf/iavf_vchnl.c b/drivers/net/iavf/iavf_vchnl.c index
> f92daf9..e2f65f5 100644
> --- a/drivers/net/iavf/iavf_vchnl.c
> +++ b/drivers/net/iavf/iavf_vchnl.c
> @@ -367,6 +367,14 @@ iavf_execute_vf_cmd(struct iavf_adapter *adapter,
> struct iavf_cmd_info *args,
>               }
>               _clear_cmd(vf);
>               break;
> +
> +    case VIRTCHNL_OP_ADD_ETH_ADDR:
> +    case VIRTCHNL_OP_DEL_ETH_ADDR:
> +        PMD_DRV_LOG(WARNING, "OP_{ADD/DEL}_ETH_ADDR
> unsupported");
> +        err = 0;
> +        _clear_cmd(vf);
> +        break;
> +
>       default:
>               /* For other virtchnl ops in running time,
>                * wait for the cmd done flag.
> --
> 2.7.4


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