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SubjectRe: [PATCH net-next 03/15] ethtool: provide netdev features with FEATURES_GET request
On Wed, 11 Mar 2020 22:40:18 +0100 (CET) Michal Kubecek wrote:
> diff --git a/net/ethtool/common.h b/net/ethtool/common.h
> index 40ba74e0b9bb..82211430d3db 100644
> --- a/net/ethtool/common.h
> +++ b/net/ethtool/common.h
> @@ -6,6 +6,8 @@
> #include <linux/netdevice.h>
> #include <linux/ethtool.h>
>
> +#define ETHTOOL_DEV_FEATURE_WORDS ((NETDEV_FEATURE_COUNT + 31) / 32)

nit: since this line is touched perhaps worth converting to
DIV_ROUND_UP()?

> /* compose link mode index from speed, type and duplex */
> #define ETHTOOL_LINK_MODE(speed, type, duplex) \
> ETHTOOL_LINK_MODE_ ## speed ## base ## type ## _ ## duplex ## _BIT

> +static void ethnl_features_to_bitmap32(u32 *dest, netdev_features_t src)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; i++)
> + dest[i] = (u32)(src >> (32 * i));

nit: cast unnecessary

> +}
> +
> +static int features_prepare_data(const struct ethnl_req_info *req_base,
> + struct ethnl_reply_data *reply_base,
> + struct genl_info *info)
> +{
> + struct features_reply_data *data = FEATURES_REPDATA(reply_base);
> + struct net_device *dev = reply_base->dev;
> + netdev_features_t all_features;
> +
> + ethnl_features_to_bitmap32(data->hw, dev->hw_features);
> + ethnl_features_to_bitmap32(data->wanted, dev->wanted_features);
> + ethnl_features_to_bitmap32(data->active, dev->features);
> + ethnl_features_to_bitmap32(data->nochange, NETIF_F_NEVER_CHANGE);
> + all_features = ~(netdev_features_t)0 >>
> + (8 * sizeof(all_features) - NETDEV_FEATURE_COUNT);

nit: GENMASK_ULL(NETDEV_FEATURE_COUNT % 32 - 1, 0) ?

> + ethnl_features_to_bitmap32(data->all, all_features);
> +
> + return 0;
> +}

> +static int features_fill_reply(struct sk_buff *skb,
> + const struct ethnl_req_info *req_base,
> + const struct ethnl_reply_data *reply_base)
> +{
> + const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
> + bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
> + int ret;
> +
> + ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_HW, data->hw,
> + data->all, NETDEV_FEATURE_COUNT,
> + netdev_features_strings, compact);
> + if (ret < 0)
> + return ret;
> + ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_WANTED, data->wanted,
> + NULL, NETDEV_FEATURE_COUNT,
> + netdev_features_strings, compact);
> + if (ret < 0)
> + return ret;
> + ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_ACTIVE, data->active,
> + NULL, NETDEV_FEATURE_COUNT,
> + netdev_features_strings, compact);
> + if (ret < 0)
> + return ret;
> + ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_NOCHANGE,
> + data->nochange, NULL, NETDEV_FEATURE_COUNT,
> + netdev_features_strings, compact);
> +
> + return ret;

nit: return directly?

> +}

Probably not worth respinning for just those nits:

Reviewed-by: Jakub Kicinski <kuba@kernel.org>

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