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, 600 insertions, 0 deletions

diff --git a/include/media/demux.h b/include/media/demux.h
new file mode 100644
index 000000000..bf00a5a41
--- /dev/null
+++ b/include/media/demux.h
@@ -0,0 +1,600 @@
+/*
+ * demux.h
+ *
+ * The Kernel Digital TV Demux kABI defines a driver-internal interface for
+ * registering low-level, hardware specific driver to a hardware independent
+ * demux layer.
+ *
+ * Copyright (c) 2002 Convergence GmbH
+ *
+ * based on code:
+ * Copyright (c) 2000 Nokia Research Center
+ *                    Tampere, FINLAND
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ */
+
+#ifndef __DEMUX_H
+#define __DEMUX_H
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/list.h>
+#include <linux/time.h>
+#include <linux/dvb/dmx.h>
+
+/*
+ * Common definitions
+ */
+
+/*
+ * DMX_MAX_FILTER_SIZE: Maximum length (in bytes) of a section/PES filter.
+ */
+
+#ifndef DMX_MAX_FILTER_SIZE
+#define DMX_MAX_FILTER_SIZE 18
+#endif
+
+/*
+ * DMX_MAX_SECFEED_SIZE: Maximum length (in bytes) of a private section feed
+ * filter.
+ */
+
+#ifndef DMX_MAX_SECTION_SIZE
+#define DMX_MAX_SECTION_SIZE 4096
+#endif
+#ifndef DMX_MAX_SECFEED_SIZE
+#define DMX_MAX_SECFEED_SIZE (DMX_MAX_SECTION_SIZE + 188)
+#endif
+
+/*
+ * TS packet reception
+ */
+
+/**
+ * enum ts_filter_type - filter type bitmap for dmx_ts_feed.set\(\)
+ *
+ * @TS_PACKET:		Send TS packets (188 bytes) to callback (default).
+ * @TS_PAYLOAD_ONLY:	In case TS_PACKET is set, only send the TS payload
+ *			(<=184 bytes per packet) to callback
+ * @TS_DECODER:		Send stream to built-in decoder (if present).
+ * @TS_DEMUX:		In case TS_PACKET is set, send the TS to the demux
+ *			device, not to the dvr device
+ */
+enum ts_filter_type {
+	TS_PACKET = 1,
+	TS_PAYLOAD_ONLY = 2,
+	TS_DECODER = 4,
+	TS_DEMUX = 8,
+};
+
+/**
+ * struct dmx_ts_feed - Structure that contains a TS feed filter
+ *
+ * @is_filtering:	Set to non-zero when filtering in progress
+ * @parent:		pointer to struct dmx_demux
+ * @priv:		pointer to private data of the API client
+ * @set:		sets the TS filter
+ * @start_filtering:	starts TS filtering
+ * @stop_filtering:	stops TS filtering
+ *
+ * A TS feed is typically mapped to a hardware PID filter on the demux chip.
+ * Using this API, the client can set the filtering properties to start/stop
+ * filtering TS packets on a particular TS feed.
+ */
+struct dmx_ts_feed {
+	int is_filtering;
+	struct dmx_demux *parent;
+	void *priv;
+	int (*set)(struct dmx_ts_feed *feed,
+		   u16 pid,
+		   int type,
+		   enum dmx_ts_pes pes_type,
+		   ktime_t timeout);
+	int (*start_filtering)(struct dmx_ts_feed *feed);
+	int (*stop_filtering)(struct dmx_ts_feed *feed);
+};
+
+/*
+ * Section reception
+ */
+
+/**
+ * struct dmx_section_filter - Structure that describes a section filter
+ *
+ * @filter_value: Contains up to 16 bytes (128 bits) of the TS section header
+ *		  that will be matched by the section filter
+ * @filter_mask:  Contains a 16 bytes (128 bits) filter mask with the bits
+ *		  specified by @filter_value that will be used on the filter
+ *		  match logic.
+ * @filter_mode:  Contains a 16 bytes (128 bits) filter mode.
+ * @parent:	  Back-pointer to struct dmx_section_feed.
+ * @priv:	  Pointer to private data of the API client.
+ *
+ *
+ * The @filter_mask controls which bits of @filter_value are compared with
+ * the section headers/payload. On a binary value of 1 in filter_mask, the
+ * corresponding bits are compared. The filter only accepts sections that are
+ * equal to filter_value in all the tested bit positions.
+ */
+struct dmx_section_filter {
+	u8 filter_value[DMX_MAX_FILTER_SIZE];
+	u8 filter_mask[DMX_MAX_FILTER_SIZE];
+	u8 filter_mode[DMX_MAX_FILTER_SIZE];
+	struct dmx_section_feed *parent;
+
+	void *priv;
+};
+
+/**
+ * struct dmx_section_feed - Structure that contains a section feed filter
+ *
+ * @is_filtering:	Set to non-zero when filtering in progress
+ * @parent:		pointer to struct dmx_demux
+ * @priv:		pointer to private data of the API client
+ * @check_crc:		If non-zero, check the CRC values of filtered sections.
+ * @set:		sets the section filter
+ * @allocate_filter:	This function is used to allocate a section filter on
+ *			the demux. It should only be called when no filtering
+ *			is in progress on this section feed. If a filter cannot
+ *			be allocated, the function fails with -ENOSPC.
+ * @release_filter:	This function releases all the resources of a
+ *			previously allocated section filter. The function
+ *			should not be called while filtering is in progress
+ *			on this section feed. After calling this function,
+ *			the caller should not try to dereference the filter
+ *			pointer.
+ * @start_filtering:	starts section filtering
+ * @stop_filtering:	stops section filtering
+ *
+ * A TS feed is typically mapped to a hardware PID filter on the demux chip.
+ * Using this API, the client can set the filtering properties to start/stop
+ * filtering TS packets on a particular TS feed.
+ */
+struct dmx_section_feed {
+	int is_filtering;
+	struct dmx_demux *parent;
+	void *priv;
+
+	int check_crc;
+
+	/* private: Used internally at dvb_demux.c */
+	u32 crc_val;
+
+	u8 *secbuf;
+	u8 secbuf_base[DMX_MAX_SECFEED_SIZE];
+	u16 secbufp, seclen, tsfeedp;
+
+	/* public: */
+	int (*set)(struct dmx_section_feed *feed,
+		   u16 pid,
+		   int check_crc);
+	int (*allocate_filter)(struct dmx_section_feed *feed,
+			       struct dmx_section_filter **filter);
+	int (*release_filter)(struct dmx_section_feed *feed,
+			      struct dmx_section_filter *filter);
+	int (*start_filtering)(struct dmx_section_feed *feed);
+	int (*stop_filtering)(struct dmx_section_feed *feed);
+};
+
+/**
+ * typedef dmx_ts_cb - DVB demux TS filter callback function prototype
+ *
+ * @buffer1:		Pointer to the start of the filtered TS packets.
+ * @buffer1_length:	Length of the TS data in buffer1.
+ * @buffer2:		Pointer to the tail of the filtered TS packets, or NULL.
+ * @buffer2_length:	Length of the TS data in buffer2.
+ * @source:		Indicates which TS feed is the source of the callback.
+ * @buffer_flags:	Address where buffer flags are stored. Those are
+ *			used to report discontinuity users via DVB
+ *			memory mapped API, as defined by
+ *			&enum dmx_buffer_flags.
+ *
+ * This function callback prototype, provided by the client of the demux API,
+ * is called from the demux code. The function is only called when filtering
+ * on a TS feed has been enabled using the start_filtering\(\) function at
+ * the &dmx_demux.
+ * Any TS packets that match the filter settings are copied to a circular
+ * buffer. The filtered TS packets are delivered to the client using this
+ * callback function.
+ * It is expected that the @buffer1 and @buffer2 callback parameters point to
+ * addresses within the circular buffer, but other implementations are also
+ * possible. Note that the called party should not try to free the memory
+ * the @buffer1 and @buffer2 parameters point to.
+ *
+ * When this function is called, the @buffer1 parameter typically points to
+ * the start of the first undelivered TS packet within a circular buffer.
+ * The @buffer2 buffer parameter is normally NULL, except when the received
+ * TS packets have crossed the last address of the circular buffer and
+ * "wrapped" to the beginning of the buffer. In the latter case the @buffer1
+ * parameter would contain an address within the circular buffer, while the
+ * @buffer2 parameter would contain the first address of the circular buffer.
+ * The number of bytes delivered with this function (i.e. @buffer1_length +
+ * @buffer2_length) is usually equal to the value of callback_length parameter
+ * given in the set() function, with one exception: if a timeout occurs before
+ * receiving callback_length bytes of TS data, any undelivered packets are
+ * immediately delivered to the client by calling this function. The timeout
+ * duration is controlled by the set() function in the TS Feed API.
+ *
+ * If a TS packet is received with errors that could not be fixed by the
+ * TS-level forward error correction (FEC), the Transport_error_indicator
+ * flag of the TS packet header should be set. The TS packet should not be
+ * discarded, as the error can possibly be corrected by a higher layer
+ * protocol. If the called party is slow in processing the callback, it
+ * is possible that the circular buffer eventually fills up. If this happens,
+ * the demux driver should discard any TS packets received while the buffer
+ * is full and return -EOVERFLOW.
+ *
+ * The type of data returned to the callback can be selected by the
+ * &dmx_ts_feed.@set function. The type parameter decides if the raw
+ * TS packet (TS_PACKET) or just the payload (TS_PACKET|TS_PAYLOAD_ONLY)
+ * should be returned. If additionally the TS_DECODER bit is set the stream
+ * will also be sent to the hardware MPEG decoder.
+ *
+ * Return:
+ *
+ * - 0, on success;
+ *
+ * - -EOVERFLOW, on buffer overflow.
+ */
+typedef int (*dmx_ts_cb)(const u8 *buffer1,
+			 size_t buffer1_length,
+			 const u8 *buffer2,
+			 size_t buffer2_length,
+			 struct dmx_ts_feed *source,
+			 u32 *buffer_flags);
+
+/**
+ * typedef dmx_section_cb - DVB demux TS filter callback function prototype
+ *
+ * @buffer1:		Pointer to the start of the filtered section, e.g.
+ *			within the circular buffer of the demux driver.
+ * @buffer1_len:	Length of the filtered section data in @buffer1,
+ *			including headers and CRC.
+ * @buffer2:		Pointer to the tail of the filtered section data,
+ *			or NULL. Useful to handle the wrapping of a
+ *			circular buffer.
+ * @buffer2_len:	Length of the filtered section data in @buffer2,
+ *			including headers and CRC.
+ * @source:		Indicates which section feed is the source of the
+ *			callback.
+ * @buffer_flags:	Address where buffer flags are stored. Those are
+ *			used to report discontinuity users via DVB
+ *			memory mapped API, as defined by
+ *			&enum dmx_buffer_flags.
+ *
+ * This function callback prototype, provided by the client of the demux API,
+ * is called from the demux code. The function is only called when
+ * filtering of sections has been enabled using the function
+ * &dmx_ts_feed.@start_filtering. When the demux driver has received a
+ * complete section that matches at least one section filter, the client
+ * is notified via this callback function. Normally this function is called
+ * for each received section; however, it is also possible to deliver
+ * multiple sections with one callback, for example when the system load
+ * is high. If an error occurs while receiving a section, this
+ * function should be called with the corresponding error type set in the
+ * success field, whether or not there is data to deliver. The Section Feed
+ * implementation should maintain a circular buffer for received sections.
+ * However, this is not necessary if the Section Feed API is implemented as
+ * a client of the TS Feed API, because the TS Feed implementation then
+ * buffers the received data. The size of the circular buffer can be
+ * configured using the &dmx_ts_feed.@set function in the Section Feed API.
+ * If there is no room in the circular buffer when a new section is received,
+ * the section must be discarded. If this happens, the value of the success
+ * parameter should be DMX_OVERRUN_ERROR on the next callback.
+ */
+typedef int (*dmx_section_cb)(const u8 *buffer1,
+			      size_t buffer1_len,
+			      const u8 *buffer2,
+			      size_t buffer2_len,
+			      struct dmx_section_filter *source,
+			      u32 *buffer_flags);
+
+/*
+ * DVB Front-End
+ */
+
+/**
+ * enum dmx_frontend_source - Used to identify the type of frontend
+ *
+ * @DMX_MEMORY_FE:	The source of the demux is memory. It means that
+ *			the MPEG-TS to be filtered comes from userspace,
+ *			via write() syscall.
+ *
+ * @DMX_FRONTEND_0:	The source of the demux is a frontend connected
+ *			to the demux.
+ */
+enum dmx_frontend_source {
+	DMX_MEMORY_FE,
+	DMX_FRONTEND_0,
+};
+
+/**
+ * struct dmx_frontend - Structure that lists the frontends associated with
+ *			 a demux
+ *
+ * @connectivity_list:	List of front-ends that can be connected to a
+ *			particular demux;
+ * @source:		Type of the frontend.
+ *
+ * FIXME: this structure should likely be replaced soon by some
+ *	media-controller based logic.
+ */
+struct dmx_frontend {
+	struct list_head connectivity_list;
+	enum dmx_frontend_source source;
+};
+
+/*
+ * MPEG-2 TS Demux
+ */
+
+/**
+ * enum dmx_demux_caps - MPEG-2 TS Demux capabilities bitmap
+ *
+ * @DMX_TS_FILTERING:		set if TS filtering is supported;
+ * @DMX_SECTION_FILTERING:	set if section filtering is supported;
+ * @DMX_MEMORY_BASED_FILTERING:	set if write() available.
+ *
+ * Those flags are OR'ed in the &dmx_demux.capabilities field
+ */
+enum dmx_demux_caps {
+	DMX_TS_FILTERING = 1,
+	DMX_SECTION_FILTERING = 4,
+	DMX_MEMORY_BASED_FILTERING = 8,
+};
+
+/*
+ * Demux resource type identifier.
+ */
+
+/**
+ * DMX_FE_ENTRY - Casts elements in the list of registered
+ *		  front-ends from the generic type struct list_head
+ *		  to the type * struct dmx_frontend
+ *
+ * @list: list of struct dmx_frontend
+ */
+#define DMX_FE_ENTRY(list) \
+	list_entry(list, struct dmx_frontend, connectivity_list)
+
+/**
+ * struct dmx_demux - Structure that contains the demux capabilities and
+ *		      callbacks.
+ *
+ * @capabilities: Bitfield of capability flags.
+ *
+ * @frontend: Front-end connected to the demux
+ *
+ * @priv: Pointer to private data of the API client
+ *
+ * @open: This function reserves the demux for use by the caller and, if
+ *	necessary, initializes the demux. When the demux is no longer needed,
+ *	the function @close should be called. It should be possible for
+ *	multiple clients to access the demux at the same time. Thus, the
+ *	function implementation should increment the demux usage count when
+ *	@open is called and decrement it when @close is called.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	It returns:
+ *	0 on success;
+ *	-EUSERS, if maximum usage count was reached;
+ *	-EINVAL, on bad parameter.
+ *
+ * @close: This function reserves the demux for use by the caller and, if
+ *	necessary, initializes the demux. When the demux is no longer needed,
+ *	the function @close should be called. It should be possible for
+ *	multiple clients to access the demux at the same time. Thus, the
+ *	function implementation should increment the demux usage count when
+ *	@open is called and decrement it when @close is called.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	It returns:
+ *	0 on success;
+ *	-ENODEV, if demux was not in use (e. g. no users);
+ *	-EINVAL, on bad parameter.
+ *
+ * @write: This function provides the demux driver with a memory buffer
+ *	containing TS packets. Instead of receiving TS packets from the DVB
+ *	front-end, the demux driver software will read packets from memory.
+ *	Any clients of this demux with active TS, PES or Section filters will
+ *	receive filtered data via the Demux callback API (see 0). The function
+ *	returns when all the data in the buffer has been consumed by the demux.
+ *	Demux hardware typically cannot read TS from memory. If this is the
+ *	case, memory-based filtering has to be implemented entirely in software.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	The @buf function parameter contains a pointer to the TS data in
+ *	kernel-space memory.
+ *	The @count function parameter contains the length of the TS data.
+ *	It returns:
+ *	0 on success;
+ *	-ERESTARTSYS, if mutex lock was interrupted;
+ *	-EINTR, if a signal handling is pending;
+ *	-ENODEV, if demux was removed;
+ *	-EINVAL, on bad parameter.
+ *
+ * @allocate_ts_feed: Allocates a new TS feed, which is used to filter the TS
+ *	packets carrying a certain PID. The TS feed normally corresponds to a
+ *	hardware PID filter on the demux chip.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	The @feed function parameter contains a pointer to the TS feed API and
+ *	instance data.
+ *	The @callback function parameter contains a pointer to the callback
+ *	function for passing received TS packet.
+ *	It returns:
+ *	0 on success;
+ *	-ERESTARTSYS, if mutex lock was interrupted;
+ *	-EBUSY, if no more TS feeds is available;
+ *	-EINVAL, on bad parameter.
+ *
+ * @release_ts_feed: Releases the resources allocated with @allocate_ts_feed.
+ *	Any filtering in progress on the TS feed should be stopped before
+ *	calling this function.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	The @feed function parameter contains a pointer to the TS feed API and
+ *	instance data.
+ *	It returns:
+ *	0 on success;
+ *	-EINVAL on bad parameter.
+ *
+ * @allocate_section_feed: Allocates a new section feed, i.e. a demux resource
+ *	for filtering and receiving sections. On platforms with hardware
+ *	support for section filtering, a section feed is directly mapped to
+ *	the demux HW. On other platforms, TS packets are first PID filtered in
+ *	hardware and a hardware section filter then emulated in software. The
+ *	caller obtains an API pointer of type dmx_section_feed_t as an out
+ *	parameter. Using this API the caller can set filtering parameters and
+ *	start receiving sections.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	The @feed function parameter contains a pointer to the TS feed API and
+ *	instance data.
+ *	The @callback function parameter contains a pointer to the callback
+ *	function for passing received TS packet.
+ *	It returns:
+ *	0 on success;
+ *	-EBUSY, if no more TS feeds is available;
+ *	-EINVAL, on bad parameter.
+ *
+ * @release_section_feed: Releases the resources allocated with
+ *	@allocate_section_feed, including allocated filters. Any filtering in
+ *	progress on the section feed should be stopped before calling this
+ *	function.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	The @feed function parameter contains a pointer to the TS feed API and
+ *	instance data.
+ *	It returns:
+ *	0 on success;
+ *	-EINVAL, on bad parameter.
+ *
+ * @add_frontend: Registers a connectivity between a demux and a front-end,
+ *	i.e., indicates that the demux can be connected via a call to
+ *	@connect_frontend to use the given front-end as a TS source. The
+ *	client of this function has to allocate dynamic or static memory for
+ *	the frontend structure and initialize its fields before calling this
+ *	function. This function is normally called during the driver
+ *	initialization. The caller must not free the memory of the frontend
+ *	struct before successfully calling @remove_frontend.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	The @frontend function parameter contains a pointer to the front-end
+ *	instance data.
+ *	It returns:
+ *	0 on success;
+ *	-EINVAL, on bad parameter.
+ *
+ * @remove_frontend: Indicates that the given front-end, registered by a call
+ *	to @add_frontend, can no longer be connected as a TS source by this
+ *	demux. The function should be called when a front-end driver or a demux
+ *	driver is removed from the system. If the front-end is in use, the
+ *	function fails with the return value of -EBUSY. After successfully
+ *	calling this function, the caller can free the memory of the frontend
+ *	struct if it was dynamically allocated before the @add_frontend
+ *	operation.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	The @frontend function parameter contains a pointer to the front-end
+ *	instance data.
+ *	It returns:
+ *	0 on success;
+ *	-ENODEV, if the front-end was not found,
+ *	-EINVAL, on bad parameter.
+ *
+ * @get_frontends: Provides the APIs of the front-ends that have been
+ *	registered for this demux. Any of the front-ends obtained with this
+ *	call can be used as a parameter for @connect_frontend. The include
+ *	file demux.h contains the macro DMX_FE_ENTRY() for converting an
+ *	element of the generic type struct &list_head * to the type
+ *	struct &dmx_frontend *. The caller must not free the memory of any of
+ *	the elements obtained via this function call.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	It returns a struct list_head pointer to the list of front-end
+ *	interfaces, or NULL in the case of an empty list.
+ *
+ * @connect_frontend: Connects the TS output of the front-end to the input of
+ *	the demux. A demux can only be connected to a front-end registered to
+ *	the demux with the function @add_frontend. It may or may not be
+ *	possible to connect multiple demuxes to the same front-end, depending
+ *	on the capabilities of the HW platform. When not used, the front-end
+ *	should be released by calling @disconnect_frontend.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	The @frontend function parameter contains a pointer to the front-end
+ *	instance data.
+ *	It returns:
+ *	0 on success;
+ *	-EINVAL, on bad parameter.
+ *
+ * @disconnect_frontend: Disconnects the demux and a front-end previously
+ *	connected by a @connect_frontend call.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	It returns:
+ *	0 on success;
+ *	-EINVAL on bad parameter.
+ *
+ * @get_pes_pids: Get the PIDs for DMX_PES_AUDIO0, DMX_PES_VIDEO0,
+ *	DMX_PES_TELETEXT0, DMX_PES_SUBTITLE0 and DMX_PES_PCR0.
+ *	The @demux function parameter contains a pointer to the demux API and
+ *	instance data.
+ *	The @pids function parameter contains an array with five u16 elements
+ *	where the PIDs will be stored.
+ *	It returns:
+ *	0 on success;
+ *	-EINVAL on bad parameter.
+ */
+struct dmx_demux {
+	enum dmx_demux_caps capabilities;
+	struct dmx_frontend *frontend;
+	void *priv;
+	int (*open)(struct dmx_demux *demux);
+	int (*close)(struct dmx_demux *demux);
+	int (*write)(struct dmx_demux *demux, const char __user *buf,
+		     size_t count);
+	int (*allocate_ts_feed)(struct dmx_demux *demux,
+				struct dmx_ts_feed **feed,
+				dmx_ts_cb callback);
+	int (*release_ts_feed)(struct dmx_demux *demux,
+			       struct dmx_ts_feed *feed);
+	int (*allocate_section_feed)(struct dmx_demux *demux,
+				     struct dmx_section_feed **feed,
+				     dmx_section_cb callback);
+	int (*release_section_feed)(struct dmx_demux *demux,
+				    struct dmx_section_feed *feed);
+	int (*add_frontend)(struct dmx_demux *demux,
+			    struct dmx_frontend *frontend);
+	int (*remove_frontend)(struct dmx_demux *demux,
+			       struct dmx_frontend *frontend);
+	struct list_head *(*get_frontends)(struct dmx_demux *demux);
+	int (*connect_frontend)(struct dmx_demux *demux,
+				struct dmx_frontend *frontend);
+	int (*disconnect_frontend)(struct dmx_demux *demux);
+
+	int (*get_pes_pids)(struct dmx_demux *demux, u16 *pids);
+
+	/* private: */
+
+	/*
+	 * Only used at av7110, to read some data from firmware.
+	 * As this was never documented, we have no clue about what's
+	 * there, and its usage on other drivers aren't encouraged.
+	 */
+	int (*get_stc)(struct dmx_demux *demux, unsigned int num,
+		       u64 *stc, unsigned int *base);
+};
+
+#endif /* #ifndef __DEMUX_H */