netdev - Re: [RFC net-next] ethtool: provide XDP information with XDP_FEATURES

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Date:   Mon, 6 Mar 2023 14:20:10 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, davem@...emloft.net,
        kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
        hawk@...nel.org, toke@...hat.com, memxor@...il.com,
        alardam@...il.com, lorenzo.bianconi@...hat.com
Subject: Re: [RFC net-next] ethtool: provide XDP information with
 XDP_FEATURES_GET

On Mon, Mar 06, 2023 at 11:26:10AM +0100, Lorenzo Bianconi wrote:
> Implement XDP_FEATURES_GET request to get network device information
> about supported xdp functionalities through ethtool.
> 
> Tested-by: Matteo Croce <teknoraver@...a.com>
> Co-developed-by: Marek Majtyka <alardam@...il.com>
> Signed-off-by: Marek Majtyka <alardam@...il.com>
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>

...

> @@ -1429,6 +1431,18 @@ struct ethtool_sfeatures {
>  	struct ethtool_set_features_block features[];
>  };
>  
> +/**
> + * struct ethtool_xdp_gfeatures - command to get supported XDP features
> + * @cmd: command number = %ETHTOOL_XDP_GFEATURES
> + * size: array size of the features[] array

nit: 'size' -> '@...e'

> + * @features: XDP feature masks
> + */
> +struct ethtool_xdp_gfeatures {
> +	__u32	cmd;
> +	__u32	size;
> +	__u32	features[];
> +};
> +
>  /**
>   * struct ethtool_ts_info - holds a device's timestamping and PHC association
>   * @cmd: command number = %ETHTOOL_GET_TS_INFO

...

> diff --git a/net/ethtool/common.c b/net/ethtool/common.c
> index 5fb19050991e..2be672c601ad 100644
> --- a/net/ethtool/common.c
> +++ b/net/ethtool/common.c
> @@ -465,6 +465,17 @@ const char udp_tunnel_type_names[][ETH_GSTRING_LEN] = {
>  static_assert(ARRAY_SIZE(udp_tunnel_type_names) ==
>  	      __ETHTOOL_UDP_TUNNEL_TYPE_CNT);
>  
> +const char xdp_features_strings[][ETH_GSTRING_LEN] = {
> +	[NETDEV_XDP_ACT_BIT_BASIC_BIT] =	"xdp-basic",
> +	[NETDEV_XDP_ACT_BIT_REDIRECT_BIT] =	"xdp-redirect",
> +	[NETDEV_XDP_ACT_BIT_NDO_XMIT_BIT] =	"xdp-ndo-xmit",
> +	[NETDEV_XDP_ACT_BIT_XSK_ZEROCOPY_BIT] =	"xdp-xsk-zerocopy",
> +	[NETDEV_XDP_ACT_BIT_HW_OFFLOAD_BIT] =	"xdp-hw-offload",
> +	[NETDEV_XDP_ACT_BIT_RX_SG_BIT] =	"xdp-rx-sg",
> +	[NETDEV_XDP_ACT_BIT_NDO_XMIT_SG_BIT] =	"xdp-ndo-xmit-sg",
> +};

nit: blank line here

> +static_assert(ARRAY_SIZE(xdp_features_strings) == __NETDEV_XDP_ACT_BIT_MAX);
> +
>  /* return false if legacy contained non-0 deprecated fields
>   * maxtxpkt/maxrxpkt. rest of ksettings always updated
>   */

...