Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:

 1) The addition of nftables.  No longer will we need protocol aware
    firewall filtering modules, it can all live in userspace.

    At the core of nftables is a, for lack of a better term, virtual
    machine that executes byte codes to inspect packet or metadata
    (arriving interface index, etc.) and make verdict decisions.

    Besides support for loading packet contents and comparing them, the
    interpreter supports lookups in various datastructures as
    fundamental operations.  For example sets are supports, and
    therefore one could create a set of whitelist IP address entries
    which have ACCEPT verdicts attached to them, and use the appropriate
    byte codes to do such lookups.

    Since the interpreted code is composed in userspace, userspace can
    do things like optimize things before giving it to the kernel.

    Another major improvement is the capability of atomically updating
    portions of the ruleset.  In the existing netfilter implementation,
    one has to update the entire rule set in order to make a change and
    this is very expensive.

    Userspace tools exist to create nftables rules using existing
    netfilter rule sets, but both kernel implementations will need to
    co-exist for quite some time as we transition from the old to the
    new stuff.

    Kudos to Patrick McHardy, Pablo Neira Ayuso, and others who have
    worked so hard on this.

 2) Daniel Borkmann and Hannes Frederic Sowa made several improvements
    to our pseudo-random number generator, mostly used for things like
    UDP port randomization and netfitler, amongst other things.

    In particular the taus88 generater is updated to taus113, and test
    cases are added.

 3) Support 64-bit rates in HTB and TBF schedulers, from Eric Dumazet
    and Yang Yingliang.

 4) Add support for new 577xx tigon3 chips to tg3 driver, from Nithin
    Sujir.

 5) Fix two fatal flaws in TCP dynamic right sizing, from Eric Dumazet,
    Neal Cardwell, and Yuchung Cheng.

 6) Allow IP_TOS and IP_TTL to be specified in sendmsg() ancillary
    control message data, much like other socket option attributes.
    From Francesco Fusco.

 7) Allow applications to specify a cap on the rate computed
    automatically by the kernel for pacing flows, via a new
    SO_MAX_PACING_RATE socket option.  From Eric Dumazet.

 8) Make the initial autotuned send buffer sizing in TCP more closely
    reflect actual needs, from Eric Dumazet.

 9) Currently early socket demux only happens for TCP sockets, but we
    can do it for connected UDP sockets too.  Implementation from Shawn
    Bohrer.

10) Refactor inet socket demux with the goal of improving hash demux
    performance for listening sockets.  With the main goals being able
    to use RCU lookups on even request sockets, and eliminating the
    listening lock contention.  From Eric Dumazet.

11) The bonding layer has many demuxes in it's fast path, and an RCU
    conversion was started back in 3.11, several changes here extend the
    RCU usage to even more locations.  From Ding Tianhong and Wang
    Yufen, based upon suggestions by Nikolay Aleksandrov and Veaceslav
    Falico.

12) Allow stackability of segmentation offloads to, in particular, allow
    segmentation offloading over tunnels.  From Eric Dumazet.

13) Significantly improve the handling of secret keys we input into the
    various hash functions in the inet hashtables, TCP fast open, as
    well as syncookies.  From Hannes Frederic Sowa.  The key fundamental
    operation is "net_get_random_once()" which uses static keys.

    Hannes even extended this to ipv4/ipv6 fragmentation handling and
    our generic flow dissector.

14) The generic driver layer takes care now to set the driver data to
    NULL on device removal, so it's no longer necessary for drivers to
    explicitly set it to NULL any more.  Many drivers have been cleaned
    up in this way, from Jingoo Han.

15) Add a BPF based packet scheduler classifier, from Daniel Borkmann.

16) Improve CRC32 interfaces and generic SKB checksum iterators so that
    SCTP's checksumming can more cleanly be handled.  Also from Daniel
    Borkmann.

17) Add a new PMTU discovery mode, IP_PMTUDISC_INTERFACE, which forces
    using the interface MTU value.  This helps avoid PMTU attacks,
    particularly on DNS servers.  From Hannes Frederic Sowa.

18) Use generic XPS for transmit queue steering rather than internal
    (re-)implementation in virtio-net.  From Jason Wang.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1622 commits)
  random32: add test cases for taus113 implementation
  random32: upgrade taus88 generator to taus113 from errata paper
  random32: move rnd_state to linux/random.h
  random32: add prandom_reseed_late() and call when nonblocking pool becomes initialized
  random32: add periodic reseeding
  random32: fix off-by-one in seeding requirement
  PHY: Add RTL8201CP phy_driver to realtek
  xtsonic: add missing platform_set_drvdata() in xtsonic_probe()
  macmace: add missing platform_set_drvdata() in mace_probe()
  ethernet/arc/arc_emac: add missing platform_set_drvdata() in arc_emac_probe()
  ipv6: protect for_each_sk_fl_rcu in mem_check with rcu_read_lock_bh
  vlan: Implement vlan_dev_get_egress_qos_mask as an inline.
  ixgbe: add warning when max_vfs is out of range.
  igb: Update link modes display in ethtool
  netfilter: push reasm skb through instead of original frag skbs
  ip6_output: fragment outgoing reassembled skb properly
  MAINTAINERS: mv643xx_eth: take over maintainership from Lennart
  net_sched: tbf: support of 64bit rates
  ixgbe: deleting dfwd stations out of order can cause null ptr deref
  ixgbe: fix build err, num_rx_queues is only available with CONFIG_RPS
  ...

1 files changed, 320 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/dfs_pattern_detector.c b/drivers/net/wireless/ath/dfs_pattern_detector.c
new file mode 100644
index 000000000000..a1a69c5db409
--- /dev/null
+++ b/drivers/net/wireless/ath/dfs_pattern_detector.c
@@ -0,0 +1,320 @@
+/*
+ * Copyright (c) 2012 Neratec Solutions AG
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/slab.h>
+#include <linux/export.h>
+
+#include "dfs_pattern_detector.h"
+#include "dfs_pri_detector.h"
+#include "ath.h"
+
+/*
+ * tolerated deviation of radar time stamp in usecs on both sides
+ * TODO: this might need to be HW-dependent
+ */
+#define PRI_TOLERANCE	16
+
+/**
+ * struct radar_types - contains array of patterns defined for one DFS domain
+ * @domain: DFS regulatory domain
+ * @num_radar_types: number of radar types to follow
+ * @radar_types: radar types array
+ */
+struct radar_types {
+	enum nl80211_dfs_regions region;
+	u32 num_radar_types;
+	const struct radar_detector_specs *radar_types;
+};
+
+/* percentage on ppb threshold to trigger detection */
+#define MIN_PPB_THRESH	50
+#define PPB_THRESH(PPB) ((PPB * MIN_PPB_THRESH + 50) / 100)
+#define PRF2PRI(PRF) ((1000000 + PRF / 2) / PRF)
+/* percentage of pulse width tolerance */
+#define WIDTH_TOLERANCE 5
+#define WIDTH_LOWER(X) ((X*(100-WIDTH_TOLERANCE)+50)/100)
+#define WIDTH_UPPER(X) ((X*(100+WIDTH_TOLERANCE)+50)/100)
+
+#define ETSI_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB)	\
+{								\
+	ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX),		\
+	(PRF2PRI(PMAX) - PRI_TOLERANCE),			\
+	(PRF2PRI(PMIN) * PRF + PRI_TOLERANCE), PRF, PPB * PRF,	\
+	PPB_THRESH(PPB), PRI_TOLERANCE,				\
+}
+
+/* radar types as defined by ETSI EN-301-893 v1.5.1 */
+static const struct radar_detector_specs etsi_radar_ref_types_v15[] = {
+	ETSI_PATTERN(0,  0,  1,  700,  700, 1, 18),
+	ETSI_PATTERN(1,  0,  5,  200, 1000, 1, 10),
+	ETSI_PATTERN(2,  0, 15,  200, 1600, 1, 15),
+	ETSI_PATTERN(3,  0, 15, 2300, 4000, 1, 25),
+	ETSI_PATTERN(4, 20, 30, 2000, 4000, 1, 20),
+	ETSI_PATTERN(5,  0,  2,  300,  400, 3, 10),
+	ETSI_PATTERN(6,  0,  2,  400, 1200, 3, 15),
+};
+
+static const struct radar_types etsi_radar_types_v15 = {
+	.region			= NL80211_DFS_ETSI,
+	.num_radar_types	= ARRAY_SIZE(etsi_radar_ref_types_v15),
+	.radar_types		= etsi_radar_ref_types_v15,
+};
+
+/* for now, we support ETSI radar types, FCC and JP are TODO */
+static const struct radar_types *dfs_domains[] = {
+	&etsi_radar_types_v15,
+};
+
+/**
+ * get_dfs_domain_radar_types() - get radar types for a given DFS domain
+ * @param domain DFS domain
+ * @return radar_types ptr on success, NULL if DFS domain is not supported
+ */
+static const struct radar_types *
+get_dfs_domain_radar_types(enum nl80211_dfs_regions region)
+{
+	u32 i;
+	for (i = 0; i < ARRAY_SIZE(dfs_domains); i++) {
+		if (dfs_domains[i]->region == region)
+			return dfs_domains[i];
+	}
+	return NULL;
+}
+
+/**
+ * struct channel_detector - detector elements for a DFS channel
+ * @head: list_head
+ * @freq: frequency for this channel detector in MHz
+ * @detectors: array of dynamically created detector elements for this freq
+ *
+ * Channel detectors are required to provide multi-channel DFS detection, e.g.
+ * to support off-channel scanning. A pattern detector has a list of channels
+ * radar pulses have been reported for in the past.
+ */
+struct channel_detector {
+	struct list_head head;
+	u16 freq;
+	struct pri_detector **detectors;
+};
+
+/* channel_detector_reset() - reset detector lines for a given channel */
+static void channel_detector_reset(struct dfs_pattern_detector *dpd,
+				   struct channel_detector *cd)
+{
+	u32 i;
+	if (cd == NULL)
+		return;
+	for (i = 0; i < dpd->num_radar_types; i++)
+		cd->detectors[i]->reset(cd->detectors[i], dpd->last_pulse_ts);
+}
+
+/* channel_detector_exit() - destructor */
+static void channel_detector_exit(struct dfs_pattern_detector *dpd,
+				  struct channel_detector *cd)
+{
+	u32 i;
+	if (cd == NULL)
+		return;
+	list_del(&cd->head);
+	for (i = 0; i < dpd->num_radar_types; i++) {
+		struct pri_detector *de = cd->detectors[i];
+		if (de != NULL)
+			de->exit(de);
+	}
+	kfree(cd->detectors);
+	kfree(cd);
+}
+
+static struct channel_detector *
+channel_detector_create(struct dfs_pattern_detector *dpd, u16 freq)
+{
+	u32 sz, i;
+	struct channel_detector *cd;
+
+	cd = kmalloc(sizeof(*cd), GFP_ATOMIC);
+	if (cd == NULL)
+		goto fail;
+
+	INIT_LIST_HEAD(&cd->head);
+	cd->freq = freq;
+	sz = sizeof(cd->detectors) * dpd->num_radar_types;
+	cd->detectors = kzalloc(sz, GFP_ATOMIC);
+	if (cd->detectors == NULL)
+		goto fail;
+
+	for (i = 0; i < dpd->num_radar_types; i++) {
+		const struct radar_detector_specs *rs = &dpd->radar_spec[i];
+		struct pri_detector *de = pri_detector_init(rs);
+		if (de == NULL)
+			goto fail;
+		cd->detectors[i] = de;
+	}
+	list_add(&cd->head, &dpd->channel_detectors);
+	return cd;
+
+fail:
+	ath_dbg(dpd->common, DFS,
+		"failed to allocate channel_detector for freq=%d\n", freq);
+	channel_detector_exit(dpd, cd);
+	return NULL;
+}
+
+/**
+ * channel_detector_get() - get channel detector for given frequency
+ * @param dpd instance pointer
+ * @param freq frequency in MHz
+ * @return pointer to channel detector on success, NULL otherwise
+ *
+ * Return existing channel detector for the given frequency or return a
+ * newly create one.
+ */
+static struct channel_detector *
+channel_detector_get(struct dfs_pattern_detector *dpd, u16 freq)
+{
+	struct channel_detector *cd;
+	list_for_each_entry(cd, &dpd->channel_detectors, head) {
+		if (cd->freq == freq)
+			return cd;
+	}
+	return channel_detector_create(dpd, freq);
+}
+
+/*
+ * DFS Pattern Detector
+ */
+
+/* dpd_reset(): reset all channel detectors */
+static void dpd_reset(struct dfs_pattern_detector *dpd)
+{
+	struct channel_detector *cd;
+	if (!list_empty(&dpd->channel_detectors))
+		list_for_each_entry(cd, &dpd->channel_detectors, head)
+			channel_detector_reset(dpd, cd);
+
+}
+static void dpd_exit(struct dfs_pattern_detector *dpd)
+{
+	struct channel_detector *cd, *cd0;
+	if (!list_empty(&dpd->channel_detectors))
+		list_for_each_entry_safe(cd, cd0, &dpd->channel_detectors, head)
+			channel_detector_exit(dpd, cd);
+	kfree(dpd);
+}
+
+static bool
+dpd_add_pulse(struct dfs_pattern_detector *dpd, struct pulse_event *event)
+{
+	u32 i;
+	struct channel_detector *cd;
+
+	/*
+	 * pulses received for a non-supported or un-initialized
+	 * domain are treated as detected radars for fail-safety
+	 */
+	if (dpd->region == NL80211_DFS_UNSET)
+		return true;
+
+	cd = channel_detector_get(dpd, event->freq);
+	if (cd == NULL)
+		return false;
+
+	dpd->last_pulse_ts = event->ts;
+	/* reset detector on time stamp wraparound, caused by TSF reset */
+	if (event->ts < dpd->last_pulse_ts)
+		dpd_reset(dpd);
+
+	/* do type individual pattern matching */
+	for (i = 0; i < dpd->num_radar_types; i++) {
+		struct pri_detector *pd = cd->detectors[i];
+		struct pri_sequence *ps = pd->add_pulse(pd, event);
+		if (ps != NULL) {
+			ath_dbg(dpd->common, DFS,
+				"DFS: radar found on freq=%d: id=%d, pri=%d, "
+				"count=%d, count_false=%d\n",
+				event->freq, pd->rs->type_id,
+				ps->pri, ps->count, ps->count_falses);
+			channel_detector_reset(dpd, cd);
+			return true;
+		}
+	}
+	return false;
+}
+
+static struct ath_dfs_pool_stats
+dpd_get_stats(struct dfs_pattern_detector *dpd)
+{
+	return global_dfs_pool_stats;
+}
+
+static bool dpd_set_domain(struct dfs_pattern_detector *dpd,
+			   enum nl80211_dfs_regions region)
+{
+	const struct radar_types *rt;
+	struct channel_detector *cd, *cd0;
+
+	if (dpd->region == region)
+		return true;
+
+	dpd->region = NL80211_DFS_UNSET;
+
+	rt = get_dfs_domain_radar_types(region);
+	if (rt == NULL)
+		return false;
+
+	/* delete all channel detectors for previous DFS domain */
+	if (!list_empty(&dpd->channel_detectors))
+		list_for_each_entry_safe(cd, cd0, &dpd->channel_detectors, head)
+			channel_detector_exit(dpd, cd);
+	dpd->radar_spec = rt->radar_types;
+	dpd->num_radar_types = rt->num_radar_types;
+
+	dpd->region = region;
+	return true;
+}
+
+static struct dfs_pattern_detector default_dpd = {
+	.exit		= dpd_exit,
+	.set_dfs_domain	= dpd_set_domain,
+	.add_pulse	= dpd_add_pulse,
+	.get_stats	= dpd_get_stats,
+	.region		= NL80211_DFS_UNSET,
+};
+
+struct dfs_pattern_detector *
+dfs_pattern_detector_init(struct ath_common *common,
+			  enum nl80211_dfs_regions region)
+{
+	struct dfs_pattern_detector *dpd;
+
+	if (!config_enabled(CONFIG_CFG80211_CERTIFICATION_ONUS))
+		return NULL;
+
+	dpd = kmalloc(sizeof(*dpd), GFP_KERNEL);
+	if (dpd == NULL)
+		return NULL;
+
+	*dpd = default_dpd;
+	INIT_LIST_HEAD(&dpd->channel_detectors);
+
+	dpd->common = common;
+	if (dpd->set_dfs_domain(dpd, region))
+		return dpd;
+
+	ath_dbg(common, DFS,"Could not set DFS domain to %d", region);
+	kfree(dpd);
+	return NULL;
+}
+EXPORT_SYMBOL(dfs_pattern_detector_init);