Commit 7be92514 authored by Jakub Kicinski's avatar Jakub Kicinski Committed by David S. Miller
Browse files

ethtool: check if there is at least one channel for TX/RX in the core 



Having a channel config with no ability to RX or TX traffic is
clearly wrong. Check for this in the core so the drivers don't
have to.

Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
Reviewed-by: default avatarMichal Kubecek <mkubecek@suse.cz>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a0c1d0ea

net/ethtool/channels.c

+18 −2
Original line number Diff line number Diff line
@@ -129,13 +129,13 @@ int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info) 
{

	struct nlattr *tb[ETHTOOL_A_CHANNELS_MAX + 1];

	unsigned int from_channel, old_total, i;

	bool mod = false, mod_combined = false;

	struct ethtool_channels channels = {};

	struct ethnl_req_info req_info = {};

	const struct nlattr *err_attr;

	const struct ethtool_ops *ops;

	struct net_device *dev;

	u32 max_rx_in_use = 0;

	bool mod = false;

	int ret;



	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
@@ -170,7 +170,8 @@ int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info) 
	ethnl_update_u32(&channels.other_count,

			 tb[ETHTOOL_A_CHANNELS_OTHER_COUNT], &mod);

	ethnl_update_u32(&channels.combined_count,

			 tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT], &mod);

			 tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT], &mod_combined);

	mod |= mod_combined;

	ret = 0;

	if (!mod)

		goto out_ops;
@@ -193,6 +194,21 @@ int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info) 
		goto out_ops;

	}



	/* ensure there is at least one RX and one TX channel */

	if (!channels.combined_count && !channels.rx_count)

		err_attr = tb[ETHTOOL_A_CHANNELS_RX_COUNT];

	else if (!channels.combined_count && !channels.tx_count)

		err_attr = tb[ETHTOOL_A_CHANNELS_TX_COUNT];

	else

		err_attr = NULL;

	if (err_attr) {

		if (mod_combined)

			err_attr = tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT];

		ret = -EINVAL;

		NL_SET_ERR_MSG_ATTR(info->extack, err_attr, "requested channel counts would result in no RX or TX channel being configured");

		goto out_ops;

	}



	/* ensure the new Rx count fits within the configured Rx flow

	 * indirection table settings

	 */

net/ethtool/ioctl.c

+5 −0
Original line number Diff line number Diff line
@@ -1676,6 +1676,11 @@ static noinline_for_stack int ethtool_set_channels(struct net_device *dev, 
	    channels.other_count > curr.max_other)

		return -EINVAL;



	/* ensure there is at least one RX and one TX channel */

	if (!channels.combined_count &&

	    (!channels.rx_count || !channels.tx_count))

		return -EINVAL;



	/* ensure the new Rx count fits within the configured Rx flow

	 * indirection table settings */

	if (netif_is_rxfh_configured(dev) &&

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