netdev - Re: [Intel-wired-lan] [PATCH iwl-next v7 04/12] iavf: add support for negotiating flexible RXDID format

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Date: Sat, 8 Jun 2024 13:56:30 +0100
From: Simon Horman <horms@...nel.org>
To: Mateusz Polchlopek <mateusz.polchlopek@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	Jacob Keller <jacob.e.keller@...el.com>,
	Wojciech Drewek <wojciech.drewek@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH iwl-next v7 04/12] iavf: add support
 for negotiating flexible RXDID format

On Tue, Jun 04, 2024 at 09:13:52AM -0400, Mateusz Polchlopek wrote:
> From: Jacob Keller <jacob.e.keller@...el.com>
> 
> Enable support for VIRTCHNL_VF_OFFLOAD_RX_FLEX_DESC, to enable the VF
> driver the ability to determine what Rx descriptor formats are
> available. This requires sending an additional message during
> initialization and reset, the VIRTCHNL_OP_GET_SUPPORTED_RXDIDS. This
> operation requests the supported Rx descriptor IDs available from the
> PF.
> 
> This is treated the same way that VLAN V2 capabilities are handled. Add
> a new set of extended capability flags, used to process send and receipt
> of the VIRTCHNL_OP_GET_SUPPORTED_RXDIDS message.
> 
> This ensures we finish negotiating for the supported descriptor formats
> prior to beginning configuration of receive queues.
> 
> This change stores the supported format bitmap into the iavf_adapter
> structure. Additionally, if VIRTCHNL_VF_OFFLOAD_RX_FLEX_DESC is enabled
> by the PF, we need to make sure that the Rx queue configuration
> specifies the format.
> 
> Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
> Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>
> Co-developed-by: Mateusz Polchlopek <mateusz.polchlopek@...el.com>
> Signed-off-by: Mateusz Polchlopek <mateusz.polchlopek@...el.com>

Hi Mateusz, Jacob, all,

The nit below notwithstanding, this looks good to me.

Reviewed-by: Simon Horman <horms@...nel.org>

...

> @@ -262,6 +276,45 @@ int iavf_get_vf_vlan_v2_caps(struct iavf_adapter *adapter)
>  	return err;
>  }
>  
> +int iavf_get_vf_supported_rxdids(struct iavf_adapter *adapter)
> +{
> +	struct iavf_hw *hw = &adapter->hw;
> +	struct iavf_arq_event_info event;
> +	enum virtchnl_ops op;
> +	enum iavf_status err;
> +	u16 len;
> +
> +	len =  sizeof(struct virtchnl_supported_rxdids);
> +	event.buf_len = len;
> +	event.msg_buf = kzalloc(event.buf_len, GFP_KERNEL);
> +	if (!event.msg_buf) {
> +		err = -ENOMEM;
> +		goto out;
> +	}
> +
> +	while (1) {
> +		/* When the AQ is empty, iavf_clean_arq_element will return
> +		 * nonzero and this loop will terminate.
> +		 */
> +		err = iavf_clean_arq_element(hw, &event, NULL);
> +		if (err != IAVF_SUCCESS)
> +			goto out_alloc;
> +		op = (enum virtchnl_ops)le32_to_cpu(event.desc.cookie_high);
> +		if (op == VIRTCHNL_OP_GET_SUPPORTED_RXDIDS)
> +			break;
> +	}
> +
> +	err = (enum iavf_status)le32_to_cpu(event.desc.cookie_low);
> +	if (err)
> +		goto out_alloc;
> +
> +	memcpy(&adapter->supported_rxdids, event.msg_buf, min(event.msg_len, len));

If you need to respin for some other reason,
please consider wrapping the above to <= 80 columns wide.

Likewise for the 2nd call to iavf_ptp_cap_supported() in
iavf_ptp_process_caps() in
[PATCH v7 06/12] iavf: add initial framework for registering PTP clock

Flagged by: checkpatch.pl --max-line-length=80

> +out_alloc:
> +	kfree(event.msg_buf);
> +out:
> +	return err;
> +}
> +
>  /**
>   * iavf_configure_queues
>   * @adapter: adapter structure

...