From 1661d346628115c364e2b7d5b15a64ca3bd0dbd4 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Mon, 1 Oct 2018 14:51:36 +0200 Subject: ethtool: don't allow disabling queues with umem installed We already check the RSS indirection table does not use queues which would be disabled by channel reconfiguration. Make sure user does not try to disable queues which have a UMEM and zero-copy AF_XDP socket installed. Signed-off-by: Jakub Kicinski Reviewed-by: Quentin Monnet Signed-off-by: Daniel Borkmann --- net/core/ethtool.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'net/core/ethtool.c') diff --git a/net/core/ethtool.c b/net/core/ethtool.c index 9a648fb09594..5a788adeba0b 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -27,6 +27,7 @@ #include #include #include +#include /* * Some useful ethtool_ops methods that're device independent. @@ -1656,7 +1657,9 @@ static noinline_for_stack int ethtool_set_channels(struct net_device *dev, void __user *useraddr) { struct ethtool_channels channels, curr = { .cmd = ETHTOOL_GCHANNELS }; + u16 from_channel, to_channel; u32 max_rx_in_use = 0; + unsigned int i; if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels) return -EOPNOTSUPP; @@ -1680,6 +1683,14 @@ static noinline_for_stack int ethtool_set_channels(struct net_device *dev, (channels.combined_count + channels.rx_count) <= max_rx_in_use) return -EINVAL; + /* Disabling channels, query zero-copy AF_XDP sockets */ + from_channel = channels.combined_count + + min(channels.rx_count, channels.tx_count); + to_channel = curr.combined_count + max(curr.rx_count, curr.tx_count); + for (i = from_channel; i < to_channel; i++) + if (xdp_get_umem_from_qid(dev, i)) + return -EINVAL; + return dev->ethtool_ops->set_channels(dev, &channels); } -- cgit