Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 487 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/calib.c b/drivers/net/wireless/ath/ath9k/calib.c
new file mode 100644
index 000000000..fb270df75
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/calib.c
@@ -0,0 +1,487 @@
+/*
+ * Copyright (c) 2008-2011 Atheros Communications Inc.
+ *
+ * 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 "hw.h"
+#include "hw-ops.h"
+#include <linux/export.h>
+
+/* Common calibration code */
+
+
+static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer)
+{
+	int16_t nfval;
+	int16_t sort[ATH9K_NF_CAL_HIST_MAX];
+	int i, j;
+
+	for (i = 0; i < ATH9K_NF_CAL_HIST_MAX; i++)
+		sort[i] = nfCalBuffer[i];
+
+	for (i = 0; i < ATH9K_NF_CAL_HIST_MAX - 1; i++) {
+		for (j = 1; j < ATH9K_NF_CAL_HIST_MAX - i; j++) {
+			if (sort[j] > sort[j - 1]) {
+				nfval = sort[j];
+				sort[j] = sort[j - 1];
+				sort[j - 1] = nfval;
+			}
+		}
+	}
+	nfval = sort[(ATH9K_NF_CAL_HIST_MAX - 1) >> 1];
+
+	return nfval;
+}
+
+static struct ath_nf_limits *ath9k_hw_get_nf_limits(struct ath_hw *ah,
+						    struct ath9k_channel *chan)
+{
+	struct ath_nf_limits *limit;
+
+	if (!chan || IS_CHAN_2GHZ(chan))
+		limit = &ah->nf_2g;
+	else
+		limit = &ah->nf_5g;
+
+	return limit;
+}
+
+static s16 ath9k_hw_get_default_nf(struct ath_hw *ah,
+				   struct ath9k_channel *chan,
+				   int chain)
+{
+	s16 calib_nf = ath9k_hw_get_nf_limits(ah, chan)->cal[chain];
+
+	if (calib_nf)
+		return calib_nf;
+	else
+		return ath9k_hw_get_nf_limits(ah, chan)->nominal;
+}
+
+s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan,
+			   s16 nf)
+{
+	s8 noise = ATH_DEFAULT_NOISE_FLOOR;
+
+	if (nf) {
+		s8 delta = nf - ATH9K_NF_CAL_NOISE_THRESH -
+			   ath9k_hw_get_default_nf(ah, chan, 0);
+		if (delta > 0)
+			noise += delta;
+	}
+	return noise;
+}
+EXPORT_SYMBOL(ath9k_hw_getchan_noise);
+
+static void ath9k_hw_update_nfcal_hist_buffer(struct ath_hw *ah,
+					      struct ath9k_hw_cal_data *cal,
+					      int16_t *nfarray)
+{
+	struct ath_common *common = ath9k_hw_common(ah);
+	struct ath_nf_limits *limit;
+	struct ath9k_nfcal_hist *h;
+	bool high_nf_mid = false;
+	u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask;
+	int i;
+
+	h = cal->nfCalHist;
+	limit = ath9k_hw_get_nf_limits(ah, ah->curchan);
+
+	for (i = 0; i < NUM_NF_READINGS; i++) {
+		if (!(chainmask & (1 << i)) ||
+		    ((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(ah->curchan)))
+			continue;
+
+		h[i].nfCalBuffer[h[i].currIndex] = nfarray[i];
+
+		if (++h[i].currIndex >= ATH9K_NF_CAL_HIST_MAX)
+			h[i].currIndex = 0;
+
+		if (h[i].invalidNFcount > 0) {
+			h[i].invalidNFcount--;
+			h[i].privNF = nfarray[i];
+		} else {
+			h[i].privNF =
+				ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer);
+		}
+
+		if (!h[i].privNF)
+			continue;
+
+		if (h[i].privNF > limit->max) {
+			high_nf_mid = true;
+
+			ath_dbg(common, CALIBRATE,
+				"NFmid[%d] (%d) > MAX (%d), %s\n",
+				i, h[i].privNF, limit->max,
+				(test_bit(NFCAL_INTF, &cal->cal_flags) ?
+				 "not corrected (due to interference)" :
+				 "correcting to MAX"));
+
+			/*
+			 * Normally we limit the average noise floor by the
+			 * hardware specific maximum here. However if we have
+			 * encountered stuck beacons because of interference,
+			 * we bypass this limit here in order to better deal
+			 * with our environment.
+			 */
+			if (!test_bit(NFCAL_INTF, &cal->cal_flags))
+				h[i].privNF = limit->max;
+		}
+	}
+
+	/*
+	 * If the noise floor seems normal for all chains, assume that
+	 * there is no significant interference in the environment anymore.
+	 * Re-enable the enforcement of the NF maximum again.
+	 */
+	if (!high_nf_mid)
+		clear_bit(NFCAL_INTF, &cal->cal_flags);
+}
+
+static bool ath9k_hw_get_nf_thresh(struct ath_hw *ah,
+				   enum nl80211_band band,
+				   int16_t *nft)
+{
+	switch (band) {
+	case NL80211_BAND_5GHZ:
+		*nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_5);
+		break;
+	case NL80211_BAND_2GHZ:
+		*nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_2);
+		break;
+	default:
+		BUG_ON(1);
+		return false;
+	}
+
+	return true;
+}
+
+void ath9k_hw_reset_calibration(struct ath_hw *ah,
+				struct ath9k_cal_list *currCal)
+{
+	int i;
+
+	ath9k_hw_setup_calibration(ah, currCal);
+
+	ah->cal_start_time = jiffies;
+	currCal->calState = CAL_RUNNING;
+
+	for (i = 0; i < AR5416_MAX_CHAINS; i++) {
+		ah->meas0.sign[i] = 0;
+		ah->meas1.sign[i] = 0;
+		ah->meas2.sign[i] = 0;
+		ah->meas3.sign[i] = 0;
+	}
+
+	ah->cal_samples = 0;
+}
+
+/* This is done for the currently configured channel */
+bool ath9k_hw_reset_calvalid(struct ath_hw *ah)
+{
+	struct ath_common *common = ath9k_hw_common(ah);
+	struct ath9k_cal_list *currCal = ah->cal_list_curr;
+
+	if (!ah->caldata)
+		return true;
+
+	if (!AR_SREV_9100(ah) && !AR_SREV_9160_10_OR_LATER(ah))
+		return true;
+
+	if (currCal == NULL)
+		return true;
+
+	if (currCal->calState != CAL_DONE) {
+		ath_dbg(common, CALIBRATE, "Calibration state incorrect, %d\n",
+			currCal->calState);
+		return true;
+	}
+
+	currCal = ah->cal_list;
+	do {
+		ath_dbg(common, CALIBRATE, "Resetting Cal %d state for channel %u\n",
+			currCal->calData->calType,
+			ah->curchan->chan->center_freq);
+
+		ah->caldata->CalValid &= ~currCal->calData->calType;
+		currCal->calState = CAL_WAITING;
+
+		currCal = currCal->calNext;
+	} while (currCal != ah->cal_list);
+
+	return false;
+}
+EXPORT_SYMBOL(ath9k_hw_reset_calvalid);
+
+void ath9k_hw_start_nfcal(struct ath_hw *ah, bool update)
+{
+	if (ah->caldata)
+		set_bit(NFCAL_PENDING, &ah->caldata->cal_flags);
+
+	REG_SET_BIT(ah, AR_PHY_AGC_CONTROL(ah),
+		    AR_PHY_AGC_CONTROL_ENABLE_NF);
+
+	if (update)
+		REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL(ah),
+		    AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
+	else
+		REG_SET_BIT(ah, AR_PHY_AGC_CONTROL(ah),
+		    AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
+
+	REG_SET_BIT(ah, AR_PHY_AGC_CONTROL(ah), AR_PHY_AGC_CONTROL_NF);
+}
+
+int ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
+{
+	struct ath9k_nfcal_hist *h = NULL;
+	unsigned i, j;
+	u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask;
+	struct ath_common *common = ath9k_hw_common(ah);
+	s16 default_nf = ath9k_hw_get_nf_limits(ah, chan)->nominal;
+	u32 bb_agc_ctl = REG_READ(ah, AR_PHY_AGC_CONTROL(ah));
+
+	if (ah->caldata)
+		h = ah->caldata->nfCalHist;
+
+	ENABLE_REG_RMW_BUFFER(ah);
+	for (i = 0; i < NUM_NF_READINGS; i++) {
+		if (chainmask & (1 << i)) {
+			s16 nfval;
+
+			if ((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(chan))
+				continue;
+
+			if (ah->nf_override)
+				nfval = ah->nf_override;
+			else if (h)
+				nfval = h[i].privNF;
+			else {
+				/* Try to get calibrated noise floor value */
+				nfval =
+				    ath9k_hw_get_nf_limits(ah, chan)->cal[i];
+				if (nfval > -60 || nfval < -127)
+					nfval = default_nf;
+			}
+
+			REG_RMW(ah, ah->nf_regs[i],
+				(((u32) nfval << 1) & 0x1ff), 0x1ff);
+		}
+	}
+
+	/*
+	 * stop NF cal if ongoing to ensure NF load completes immediately
+	 * (or after end rx/tx frame if ongoing)
+	 */
+	if (bb_agc_ctl & AR_PHY_AGC_CONTROL_NF) {
+		REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL(ah), AR_PHY_AGC_CONTROL_NF);
+		REG_RMW_BUFFER_FLUSH(ah);
+		ENABLE_REG_RMW_BUFFER(ah);
+	}
+
+	/*
+	 * Load software filtered NF value into baseband internal minCCApwr
+	 * variable.
+	 */
+	REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL(ah),
+		    AR_PHY_AGC_CONTROL_ENABLE_NF);
+	REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL(ah),
+		    AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
+	REG_SET_BIT(ah, AR_PHY_AGC_CONTROL(ah), AR_PHY_AGC_CONTROL_NF);
+	REG_RMW_BUFFER_FLUSH(ah);
+
+	/*
+	 * Wait for load to complete, should be fast, a few 10s of us.
+	 * The max delay was changed from an original 250us to 22.2 msec.
+	 * This would increase timeout to the longest possible frame
+	 * (11n max length 22.1 msec)
+	 */
+	for (j = 0; j < 22200; j++) {
+		if ((REG_READ(ah, AR_PHY_AGC_CONTROL(ah)) &
+			      AR_PHY_AGC_CONTROL_NF) == 0)
+			break;
+		udelay(10);
+	}
+
+	/*
+	 * Restart NF so it can continue.
+	 */
+	if (bb_agc_ctl & AR_PHY_AGC_CONTROL_NF) {
+		ENABLE_REG_RMW_BUFFER(ah);
+		if (bb_agc_ctl & AR_PHY_AGC_CONTROL_ENABLE_NF)
+			REG_SET_BIT(ah, AR_PHY_AGC_CONTROL(ah),
+				    AR_PHY_AGC_CONTROL_ENABLE_NF);
+		if (bb_agc_ctl & AR_PHY_AGC_CONTROL_NO_UPDATE_NF)
+			REG_SET_BIT(ah, AR_PHY_AGC_CONTROL(ah),
+				    AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
+		REG_SET_BIT(ah, AR_PHY_AGC_CONTROL(ah), AR_PHY_AGC_CONTROL_NF);
+		REG_RMW_BUFFER_FLUSH(ah);
+	}
+
+	/*
+	 * We timed out waiting for the noisefloor to load, probably due to an
+	 * in-progress rx. Simply return here and allow the load plenty of time
+	 * to complete before the next calibration interval.  We need to avoid
+	 * trying to load -50 (which happens below) while the previous load is
+	 * still in progress as this can cause rx deafness. Instead by returning
+	 * here, the baseband nf cal will just be capped by our present
+	 * noisefloor until the next calibration timer.
+	 */
+	if (j == 22200) {
+		ath_dbg(common, ANY,
+			"Timeout while waiting for nf to load: AR_PHY_AGC_CONTROL=0x%x\n",
+			REG_READ(ah, AR_PHY_AGC_CONTROL(ah)));
+		return -ETIMEDOUT;
+	}
+
+	/*
+	 * Restore maxCCAPower register parameter again so that we're not capped
+	 * by the median we just loaded.  This will be initial (and max) value
+	 * of next noise floor calibration the baseband does.
+	 */
+	ENABLE_REG_RMW_BUFFER(ah);
+	for (i = 0; i < NUM_NF_READINGS; i++) {
+		if (chainmask & (1 << i)) {
+			if ((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(chan))
+				continue;
+
+			REG_RMW(ah, ah->nf_regs[i],
+					(((u32) (-50) << 1) & 0x1ff), 0x1ff);
+		}
+	}
+	REG_RMW_BUFFER_FLUSH(ah);
+
+	return 0;
+}
+EXPORT_SYMBOL(ath9k_hw_loadnf);
+
+
+static void ath9k_hw_nf_sanitize(struct ath_hw *ah, s16 *nf)
+{
+	struct ath_common *common = ath9k_hw_common(ah);
+	struct ath_nf_limits *limit;
+	int i;
+
+	if (IS_CHAN_2GHZ(ah->curchan))
+		limit = &ah->nf_2g;
+	else
+		limit = &ah->nf_5g;
+
+	for (i = 0; i < NUM_NF_READINGS; i++) {
+		if (!nf[i])
+			continue;
+
+		ath_dbg(common, CALIBRATE,
+			"NF calibrated [%s] [chain %d] is %d\n",
+			(i >= 3 ? "ext" : "ctl"), i % 3, nf[i]);
+
+		if (nf[i] > limit->max) {
+			ath_dbg(common, CALIBRATE,
+				"NF[%d] (%d) > MAX (%d), correcting to MAX\n",
+				i, nf[i], limit->max);
+			nf[i] = limit->max;
+		} else if (nf[i] < limit->min) {
+			ath_dbg(common, CALIBRATE,
+				"NF[%d] (%d) < MIN (%d), correcting to NOM\n",
+				i, nf[i], limit->min);
+			nf[i] = limit->nominal;
+		}
+	}
+}
+
+bool ath9k_hw_getnf(struct ath_hw *ah, struct ath9k_channel *chan)
+{
+	struct ath_common *common = ath9k_hw_common(ah);
+	int16_t nf, nfThresh;
+	int16_t nfarray[NUM_NF_READINGS] = { 0 };
+	struct ath9k_nfcal_hist *h;
+	struct ieee80211_channel *c = chan->chan;
+	struct ath9k_hw_cal_data *caldata = ah->caldata;
+
+	if (REG_READ(ah, AR_PHY_AGC_CONTROL(ah)) & AR_PHY_AGC_CONTROL_NF) {
+		ath_dbg(common, CALIBRATE,
+			"NF did not complete in calibration window\n");
+		return false;
+	}
+
+	ath9k_hw_do_getnf(ah, nfarray);
+	ath9k_hw_nf_sanitize(ah, nfarray);
+	nf = nfarray[0];
+	if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh)
+	    && nf > nfThresh) {
+		ath_dbg(common, CALIBRATE,
+			"noise floor failed detected; detected %d, threshold %d\n",
+			nf, nfThresh);
+	}
+
+	if (!caldata) {
+		chan->noisefloor = nf;
+		return false;
+	}
+
+	h = caldata->nfCalHist;
+	clear_bit(NFCAL_PENDING, &caldata->cal_flags);
+	ath9k_hw_update_nfcal_hist_buffer(ah, caldata, nfarray);
+	chan->noisefloor = h[0].privNF;
+	ah->noise = ath9k_hw_getchan_noise(ah, chan, chan->noisefloor);
+	return true;
+}
+EXPORT_SYMBOL(ath9k_hw_getnf);
+
+void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah,
+				  struct ath9k_channel *chan)
+{
+	struct ath9k_nfcal_hist *h;
+	int i, j, k = 0;
+
+	ah->caldata->channel = chan->channel;
+	ah->caldata->channelFlags = chan->channelFlags;
+	h = ah->caldata->nfCalHist;
+	for (i = 0; i < NUM_NF_READINGS; i++) {
+		h[i].currIndex = 0;
+		h[i].privNF = ath9k_hw_get_default_nf(ah, chan, k);
+		h[i].invalidNFcount = AR_PHY_CCA_FILTERWINDOW_LENGTH;
+		for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++)
+			h[i].nfCalBuffer[j] = h[i].privNF;
+		if (++k >= AR5416_MAX_CHAINS)
+			k = 0;
+	}
+}
+
+
+void ath9k_hw_bstuck_nfcal(struct ath_hw *ah)
+{
+	struct ath9k_hw_cal_data *caldata = ah->caldata;
+
+	if (unlikely(!caldata))
+		return;
+
+	/*
+	 * If beacons are stuck, the most likely cause is interference.
+	 * Triggering a noise floor calibration at this point helps the
+	 * hardware adapt to a noisy environment much faster.
+	 * To ensure that we recover from stuck beacons quickly, let
+	 * the baseband update the internal NF value itself, similar to
+	 * what is being done after a full reset.
+	 */
+	if (!test_bit(NFCAL_PENDING, &caldata->cal_flags))
+		ath9k_hw_start_nfcal(ah, true);
+	else if (!(REG_READ(ah, AR_PHY_AGC_CONTROL(ah)) & AR_PHY_AGC_CONTROL_NF))
+		ath9k_hw_getnf(ah, ah->curchan);
+
+	set_bit(NFCAL_INTF, &caldata->cal_flags);
+}
+EXPORT_SYMBOL(ath9k_hw_bstuck_nfcal);
+