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authorWillem de Bruijn <willemb@google.com>2012-01-26 05:34:35 -0500
committerDavid S. Miller <davem@davemloft.net>2012-01-26 16:34:08 -0500
commitf2b3ee9e4200b32d113b1bd3c93f9a836c97357c (patch)
treed80ac5e5fddf395762f2b31110757abf833e752e /tools/perf/scripts/python/sched-migration.py
parent40206dd98f066d596d4280558fc5f798165861c7 (diff)
ipv6: Fix ip_gre lockless xmits.
Tunnel devices set NETIF_F_LLTX to bypass HARD_TX_LOCK. Sit and ipip set this unconditionally in ops->setup, but gre enables it conditionally after parameter passing in ops->newlink. This is not called during tunnel setup as below, however, so GRE tunnels are still taking the lock. modprobe ip_gre ip tunnel add test0 mode gre remote 10.5.1.1 dev lo ip link set test0 up ip addr add 10.6.0.1 dev test0 # cat /sys/class/net/test0/features # $DIR/test_tunnel_xmit 10 10.5.2.1 ip route add 10.5.2.0/24 dev test0 ip tunnel del test0 The newlink callback is only called in rtnl_netlink, and only if the device is new, as it calls register_netdevice internally. Gre tunnels are created at 'ip tunnel add' with ioctl SIOCADDTUNNEL, which calls ipgre_tunnel_locate, which calls register_netdev. rtnl_newlink is called at 'ip link set', but skips ops->newlink and the device is up with locking still enabled. The equivalent ipip tunnel works fine, btw (just substitute 'method gre' for 'method ipip'). On kernels before /sys/class/net/*/features was removed [1], the first commented out line returns 0x6000 with method gre, which indicates that NETIF_F_LLTX (0x1000) is not set. With ipip, it reports 0x7000. This test cannot be used on recent kernels where the sysfs file is removed (and ETHTOOL_GFEATURES does not currently work for tunnel devices, because they lack dev->ethtool_ops). The second commented out line calls a simple transmission test [2] that sends on 24 cores at maximum rate. Results of a single run: ipip: 19,372,306 gre before patch: 4,839,753 gre after patch: 19,133,873 This patch replicates the condition check in ipgre_newlink to ipgre_tunnel_locate. It works for me, both with oseq on and off. This is the first time I looked at rtnetlink and iproute2 code, though, so someone more knowledgeable should probably check the patch. Thanks. The tail of both functions is now identical, by the way. To avoid code duplication, I'll be happy to rework this and merge the two. [1] http://patchwork.ozlabs.org/patch/104610/ [2] http://kernel.googlecode.com/files/xmit_udp_parallel.c Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/perf/scripts/python/sched-migration.py')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.2 (git 2.25.0) at 2025-08-16 13:31:14 -0400
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/*
 * Netlink inteface for IEEE 802.15.4 stack
 *
 * Copyright 2007, 2008 Siemens AG
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Written by:
 * Sergey Lapin <slapin@ossfans.org>
 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 * Maxim Osipov <maxim.osipov@siemens.com>
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/if_arp.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/wpan-phy.h>
#include <net/af_ieee802154.h>
#include <net/ieee802154_netdev.h>
#include <net/rtnetlink.h> /* for rtnl_{un,}lock */
#include <linux/nl802154.h>

#include "ieee802154.h"

static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 portid,
	u32 seq, int flags, struct wpan_phy *phy)
{
	void *hdr;
	int i, pages = 0;
	uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL);

	pr_debug("%s\n", __func__);

	if (!buf)
		return -EMSGSIZE;

	hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
		IEEE802154_LIST_PHY);
	if (!hdr)
		goto out;

	mutex_lock(&phy->pib_lock);
	if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
	    nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) ||
	    nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel))
		goto nla_put_failure;
	for (i = 0; i < 32; i++) {
		if (phy->channels_supported[i])
			buf[pages++] = phy->channels_supported[i] | (i << 27);
	}
	if (pages &&
	    nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
		    pages * sizeof(uint32_t), buf))
		goto nla_put_failure;
	mutex_unlock(&phy->pib_lock);
	kfree(buf);
	return genlmsg_end(msg, hdr);

nla_put_failure:
	mutex_unlock(&phy->pib_lock);
	genlmsg_cancel(msg, hdr);
out:
	kfree(buf);
	return -EMSGSIZE;
}

static int ieee802154_list_phy(struct sk_buff *skb,
	struct genl_info *info)
{
	/* Request for interface name, index, type, IEEE address,
	   PAN Id, short address */
	struct sk_buff *msg;
	struct wpan_phy *phy;
	const char *name;
	int rc = -ENOBUFS;

	pr_debug("%s\n", __func__);

	if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
		return -EINVAL;

	name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
	if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
		return -EINVAL; /* phy name should be null-terminated */


	phy = wpan_phy_find(name);
	if (!phy)
		return -ENODEV;

	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg)
		goto out_dev;

	rc = ieee802154_nl_fill_phy(msg, info->snd_portid, info->snd_seq,
			0, phy);
	if (rc < 0)
		goto out_free;

	wpan_phy_put(phy);

	return genlmsg_reply(msg, info);
out_free:
	nlmsg_free(msg);
out_dev:
	wpan_phy_put(phy);
	return rc;

}

struct dump_phy_data {
	struct sk_buff *skb;
	struct netlink_callback *cb;
	int idx, s_idx;
};

static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
{
	int rc;
	struct dump_phy_data *data = _data;

	pr_debug("%s\n", __func__);

	if (data->idx++ < data->s_idx)
		return 0;

	rc = ieee802154_nl_fill_phy(data->skb,
			NETLINK_CB(data->cb->skb).portid,
			data->cb->nlh->nlmsg_seq,
			NLM_F_MULTI,
			phy);

	if (rc < 0) {
		data->idx--;
		return rc;
	}

	return 0;
}

static int ieee802154_dump_phy(struct sk_buff *skb,
	struct netlink_callback *cb)
{
	struct dump_phy_data data = {
		.cb = cb,
		.skb = skb,
		.s_idx = cb->args[0],
		.idx = 0,
	};

	pr_debug("%s\n", __func__);

	wpan_phy_for_each(ieee802154_dump_phy_iter, &data);

	cb->args[0] = data.idx;

	return skb->len;
}

static int ieee802154_add_iface(struct sk_buff *skb,
		struct genl_info *info)
{
	struct sk_buff *msg;
	struct wpan_phy *phy;
	const char *name;
	const char *devname;
	int rc = -ENOBUFS;
	struct net_device *dev;
	int type = __IEEE802154_DEV_INVALID;

	pr_debug("%s\n", __func__);

	if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
		return -EINVAL;

	name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
	if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
		return -EINVAL; /* phy name should be null-terminated */

	if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
		devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
		if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
				!= '\0')
			return -EINVAL; /* phy name should be null-terminated */
	} else  {
		devname = "wpan%d";
	}

	if (strlen(devname) >= IFNAMSIZ)
		return -ENAMETOOLONG;

	phy = wpan_phy_find(name);
	if (!phy)
		return -ENODEV;

	msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
	if (!msg)
		goto out_dev;

	if (!phy->add_iface) {
		rc = -EINVAL;
		goto nla_put_failure;
	}

	if (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
	    nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
			IEEE802154_ADDR_LEN) {
		rc = -EINVAL;
		goto nla_put_failure;
	}

	if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) {
		type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]);
		if (type >= __IEEE802154_DEV_MAX)
			return -EINVAL;
	}

	dev = phy->add_iface(phy, devname, type);
	if (IS_ERR(dev)) {
		rc = PTR_ERR(dev);
		goto nla_put_failure;
	}

	if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
		struct sockaddr addr;

		addr.sa_family = ARPHRD_IEEE802154;
		nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
				IEEE802154_ADDR_LEN);

		/*
		 * strangely enough, some callbacks (inetdev_event) from
		 * dev_set_mac_address require RTNL_LOCK
		 */
		rtnl_lock();
		rc = dev_set_mac_address(dev, &addr);
		rtnl_unlock();
		if (rc)
			goto dev_unregister;
	}

	if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
	    nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name))
		goto nla_put_failure;
	dev_put(dev);

	wpan_phy_put(phy);

	return ieee802154_nl_reply(msg, info);

dev_unregister:
	rtnl_lock(); /* del_iface must be called with RTNL lock */
	phy->del_iface(phy, dev);
	dev_put(dev);
	rtnl_unlock();
nla_put_failure:
	nlmsg_free(msg);
out_dev:
	wpan_phy_put(phy);
	return rc;
}

static int ieee802154_del_iface(struct sk_buff *skb,
		struct genl_info *info)
{
	struct sk_buff *msg;
	struct wpan_phy *phy;
	const char *name;
	int rc;
	struct net_device *dev;

	pr_debug("%s\n", __func__);

	if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
		return -EINVAL;

	name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
	if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
		return -EINVAL; /* name should be null-terminated */

	dev = dev_get_by_name(genl_info_net(info), name);
	if (!dev)
		return -ENODEV;

	phy = ieee802154_mlme_ops(dev)->get_phy(dev);
	BUG_ON(!phy);

	rc = -EINVAL;
	/* phy name is optional, but should be checked if it's given */
	if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
		struct wpan_phy *phy2;

		const char *pname =
			nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
		if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
				!= '\0')
			/* name should be null-terminated */
			goto out_dev;

		phy2 = wpan_phy_find(pname);
		if (!phy2)
			goto out_dev;

		if (phy != phy2) {
			wpan_phy_put(phy2);
			goto out_dev;
		}
	}

	rc = -ENOBUFS;

	msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
	if (!msg)
		goto out_dev;

	if (!phy->del_iface) {
		rc = -EINVAL;
		goto nla_put_failure;
	}

	rtnl_lock();
	phy->del_iface(phy, dev);

	/* We don't have device anymore */
	dev_put(dev);
	dev = NULL;

	rtnl_unlock();

	if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
	    nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
		goto nla_put_failure;
	wpan_phy_put(phy);

	return ieee802154_nl_reply(msg, info);

nla_put_failure:
	nlmsg_free(msg);
out_dev:
	wpan_phy_put(phy);
	if (dev)
		dev_put(dev);

	return rc;
}

static struct genl_ops ieee802154_phy_ops[] = {
	IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
							ieee802154_dump_phy),
	IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
	IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
};

/*
 * No need to unregister as family unregistration will do it.
 */
int nl802154_phy_register(void)
{
	int i;
	int rc;

	for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) {
		rc = genl_register_ops(&nl802154_family,
				&ieee802154_phy_ops[i]);
		if (rc)
			return rc;
	}

	return 0;
}
generated by cgit v1.2.2 (git 2.25.0) at 2025-08-16 13:31:14 -0400