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ethtool: don't allow disabling queues with umem installed

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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 <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2018-10-01 14:51:36 +02:00 committed by Daniel Borkmann
parent b8c8a2e2e3
commit 1661d34662
3 changed files with 20 additions and 2 deletions
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7
include/net/xdp_sock.h
View file

@ -86,6 +86,7 @@ struct xdp_umem_fq_reuse *xsk_reuseq_prepare(u32 nentries);
struct xdp_umem_fq_reuse *xsk_reuseq_swap(struct xdp_umem *umem,
struct xdp_umem_fq_reuse *newq);
void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq);
struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev, u16 queue_id);
static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
{
@ -183,6 +184,12 @@ static inline void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq)
{
}
static inline struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev,
u16 queue_id)
{
return NULL;
}
static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
{
return NULL;

11
net/core/ethtool.c
View file

@ -27,6 +27,7 @@
#include <linux/rtnetlink.h>
#include <linux/sched/signal.h>
#include <linux/net.h>
#include <net/xdp_sock.h>
/*
* 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);
}

4
net/xdp/xdp_umem.c
View file

@ -55,8 +55,8 @@ static void xdp_reg_umem_at_qid(struct net_device *dev, struct xdp_umem *umem,
dev->_tx[queue_id].umem = umem;
}
static struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev,
u16 queue_id)
struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev,
u16 queue_id)
{
if (queue_id < dev->real_num_rx_queues)
return dev->_rx[queue_id].umem;