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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: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2020-05-15 12:49:00 -07:00 committed by David S. Miller
parent a0c1d0eafd
commit 7be92514b9
2 changed files with 23 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
net/ethtool/channels.c
View File

@ -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
*/

5
net/ethtool/ioctl.c
View File

@ -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) &&