Revision 9e2b7fa2df4365e99934901da4fb4af52d81e820 authored by Martin Willi on 06 November 2020, 07:30:30 UTC, committed by Jakub Kicinski on 12 November 2020, 15:47:06 UTC
VRF devices use an optimized direct path on output if a default qdisc is involved, calling Netfilter hooks directly. This path, however, does not consider Netfilter rules completing asynchronously, such as with NFQUEUE. The Netfilter okfn() is called for asynchronously accepted packets, but the VRF never passes that packet down the stack to send it out over the slave device. Using the slower redirect path for this seems not feasible, as we do not know beforehand if a Netfilter hook has asynchronously completing rules. Fix the use of asynchronously completing Netfilter rules in OUTPUT and POSTROUTING by using a special completion function that additionally calls dst_output() to pass the packet down the stack. Also, slightly adjust the use of nf_reset_ct() so that is called in the asynchronous case, too. Fixes: dcdd43c41e60 ("net: vrf: performance improvements for IPv4") Fixes: a9ec54d1b0cd ("net: vrf: performance improvements for IPv6") Signed-off-by: Martin Willi <martin@strongswan.org> Link: https://lore.kernel.org/r/20201106073030.3974927-1-martin@strongswan.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1 parent 52755b6
channels.c
// SPDX-License-Identifier: GPL-2.0-only
#include <net/xdp_sock_drv.h>
#include "netlink.h"
#include "common.h"
struct channels_req_info {
struct ethnl_req_info base;
};
struct channels_reply_data {
struct ethnl_reply_data base;
struct ethtool_channels channels;
};
#define CHANNELS_REPDATA(__reply_base) \
container_of(__reply_base, struct channels_reply_data, base)
const struct nla_policy ethnl_channels_get_policy[] = {
[ETHTOOL_A_CHANNELS_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
};
static int channels_prepare_data(const struct ethnl_req_info *req_base,
struct ethnl_reply_data *reply_base,
struct genl_info *info)
{
struct channels_reply_data *data = CHANNELS_REPDATA(reply_base);
struct net_device *dev = reply_base->dev;
int ret;
if (!dev->ethtool_ops->get_channels)
return -EOPNOTSUPP;
ret = ethnl_ops_begin(dev);
if (ret < 0)
return ret;
dev->ethtool_ops->get_channels(dev, &data->channels);
ethnl_ops_complete(dev);
return 0;
}
static int channels_reply_size(const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
return nla_total_size(sizeof(u32)) + /* _CHANNELS_RX_MAX */
nla_total_size(sizeof(u32)) + /* _CHANNELS_TX_MAX */
nla_total_size(sizeof(u32)) + /* _CHANNELS_OTHER_MAX */
nla_total_size(sizeof(u32)) + /* _CHANNELS_COMBINED_MAX */
nla_total_size(sizeof(u32)) + /* _CHANNELS_RX_COUNT */
nla_total_size(sizeof(u32)) + /* _CHANNELS_TX_COUNT */
nla_total_size(sizeof(u32)) + /* _CHANNELS_OTHER_COUNT */
nla_total_size(sizeof(u32)); /* _CHANNELS_COMBINED_COUNT */
}
static int channels_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct channels_reply_data *data = CHANNELS_REPDATA(reply_base);
const struct ethtool_channels *channels = &data->channels;
if ((channels->max_rx &&
(nla_put_u32(skb, ETHTOOL_A_CHANNELS_RX_MAX,
channels->max_rx) ||
nla_put_u32(skb, ETHTOOL_A_CHANNELS_RX_COUNT,
channels->rx_count))) ||
(channels->max_tx &&
(nla_put_u32(skb, ETHTOOL_A_CHANNELS_TX_MAX,
channels->max_tx) ||
nla_put_u32(skb, ETHTOOL_A_CHANNELS_TX_COUNT,
channels->tx_count))) ||
(channels->max_other &&
(nla_put_u32(skb, ETHTOOL_A_CHANNELS_OTHER_MAX,
channels->max_other) ||
nla_put_u32(skb, ETHTOOL_A_CHANNELS_OTHER_COUNT,
channels->other_count))) ||
(channels->max_combined &&
(nla_put_u32(skb, ETHTOOL_A_CHANNELS_COMBINED_MAX,
channels->max_combined) ||
nla_put_u32(skb, ETHTOOL_A_CHANNELS_COMBINED_COUNT,
channels->combined_count))))
return -EMSGSIZE;
return 0;
}
const struct ethnl_request_ops ethnl_channels_request_ops = {
.request_cmd = ETHTOOL_MSG_CHANNELS_GET,
.reply_cmd = ETHTOOL_MSG_CHANNELS_GET_REPLY,
.hdr_attr = ETHTOOL_A_CHANNELS_HEADER,
.req_info_size = sizeof(struct channels_req_info),
.reply_data_size = sizeof(struct channels_reply_data),
.prepare_data = channels_prepare_data,
.reply_size = channels_reply_size,
.fill_reply = channels_fill_reply,
};
/* CHANNELS_SET */
const struct nla_policy ethnl_channels_set_policy[] = {
[ETHTOOL_A_CHANNELS_HEADER] =
NLA_POLICY_NESTED(ethnl_header_policy),
[ETHTOOL_A_CHANNELS_RX_COUNT] = { .type = NLA_U32 },
[ETHTOOL_A_CHANNELS_TX_COUNT] = { .type = NLA_U32 },
[ETHTOOL_A_CHANNELS_OTHER_COUNT] = { .type = NLA_U32 },
[ETHTOOL_A_CHANNELS_COMBINED_COUNT] = { .type = NLA_U32 },
};
int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info)
{
unsigned int from_channel, old_total, i;
bool mod = false, mod_combined = false;
struct ethtool_channels channels = {};
struct ethnl_req_info req_info = {};
struct nlattr **tb = info->attrs;
const struct nlattr *err_attr;
const struct ethtool_ops *ops;
struct net_device *dev;
u32 max_rx_in_use = 0;
int ret;
ret = ethnl_parse_header_dev_get(&req_info,
tb[ETHTOOL_A_CHANNELS_HEADER],
genl_info_net(info), info->extack,
true);
if (ret < 0)
return ret;
dev = req_info.dev;
ops = dev->ethtool_ops;
ret = -EOPNOTSUPP;
if (!ops->get_channels || !ops->set_channels)
goto out_dev;
rtnl_lock();
ret = ethnl_ops_begin(dev);
if (ret < 0)
goto out_rtnl;
ops->get_channels(dev, &channels);
old_total = channels.combined_count +
max(channels.rx_count, channels.tx_count);
ethnl_update_u32(&channels.rx_count, tb[ETHTOOL_A_CHANNELS_RX_COUNT],
&mod);
ethnl_update_u32(&channels.tx_count, tb[ETHTOOL_A_CHANNELS_TX_COUNT],
&mod);
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_combined);
mod |= mod_combined;
ret = 0;
if (!mod)
goto out_ops;
/* ensure new channel counts are within limits */
if (channels.rx_count > channels.max_rx)
err_attr = tb[ETHTOOL_A_CHANNELS_RX_COUNT];
else if (channels.tx_count > channels.max_tx)
err_attr = tb[ETHTOOL_A_CHANNELS_TX_COUNT];
else if (channels.other_count > channels.max_other)
err_attr = tb[ETHTOOL_A_CHANNELS_OTHER_COUNT];
else if (channels.combined_count > channels.max_combined)
err_attr = tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT];
else
err_attr = NULL;
if (err_attr) {
ret = -EINVAL;
NL_SET_ERR_MSG_ATTR(info->extack, err_attr,
"requested channel count exceeds maximum");
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
*/
if (netif_is_rxfh_configured(dev) &&
!ethtool_get_max_rxfh_channel(dev, &max_rx_in_use) &&
(channels.combined_count + channels.rx_count) <= max_rx_in_use) {
GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing indirection table settings");
return -EINVAL;
}
/* Disabling channels, query zero-copy AF_XDP sockets */
from_channel = channels.combined_count +
min(channels.rx_count, channels.tx_count);
for (i = from_channel; i < old_total; i++)
if (xsk_get_pool_from_qid(dev, i)) {
GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing zerocopy AF_XDP sockets");
return -EINVAL;
}
ret = dev->ethtool_ops->set_channels(dev, &channels);
if (ret < 0)
goto out_ops;
ethtool_notify(dev, ETHTOOL_MSG_CHANNELS_NTF, NULL);
out_ops:
ethnl_ops_complete(dev);
out_rtnl:
rtnl_unlock();
out_dev:
dev_put(dev);
return ret;
}
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