From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 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(). ... --- Documentation/userspace-api/media/v4l/dev-rds.rst | 176 ++++++++++++++++++++++ 1 file changed, 176 insertions(+) create mode 100644 Documentation/userspace-api/media/v4l/dev-rds.rst (limited to 'Documentation/userspace-api/media/v4l/dev-rds.rst') diff --git a/Documentation/userspace-api/media/v4l/dev-rds.rst b/Documentation/userspace-api/media/v4l/dev-rds.rst new file mode 100644 index 000000000..b1dadc245 --- /dev/null +++ b/Documentation/userspace-api/media/v4l/dev-rds.rst @@ -0,0 +1,176 @@ +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later +.. c:namespace:: V4L + +.. _rds: + +************* +RDS Interface +************* + +The Radio Data System transmits supplementary information in binary +format, for example the station name or travel information, on an +inaudible audio subcarrier of a radio program. This interface is aimed +at devices capable of receiving and/or transmitting RDS information. + +For more information see the core RDS standard :ref:`iec62106` and the +RBDS standard :ref:`nrsc4`. + +.. note:: + + Note that the RBDS standard as is used in the USA is almost + identical to the RDS standard. Any RDS decoder/encoder can also handle + RBDS. Only some of the fields have slightly different meanings. See the + RBDS standard for more information. + +The RBDS standard also specifies support for MMBS (Modified Mobile +Search). This is a proprietary format which seems to be discontinued. +The RDS interface does not support this format. Should support for MMBS +(or the so-called 'E blocks' in general) be needed, then please contact +the linux-media mailing list: +`https://linuxtv.org/lists.php `__. + +Querying Capabilities +===================== + +Devices supporting the RDS capturing API set the +``V4L2_CAP_RDS_CAPTURE`` flag in the ``capabilities`` field of struct +:c:type:`v4l2_capability` returned by the +:ref:`VIDIOC_QUERYCAP` ioctl. Any tuner that +supports RDS will set the ``V4L2_TUNER_CAP_RDS`` flag in the +``capability`` field of struct :c:type:`v4l2_tuner`. If the +driver only passes RDS blocks without interpreting the data the +``V4L2_TUNER_CAP_RDS_BLOCK_IO`` flag has to be set, see +:ref:`Reading RDS data `. For future use the flag +``V4L2_TUNER_CAP_RDS_CONTROLS`` has also been defined. However, a driver +for a radio tuner with this capability does not yet exist, so if you are +planning to write such a driver you should discuss this on the +linux-media mailing list: +`https://linuxtv.org/lists.php `__. + +Whether an RDS signal is present can be detected by looking at the +``rxsubchans`` field of struct :c:type:`v4l2_tuner`: the +``V4L2_TUNER_SUB_RDS`` will be set if RDS data was detected. + +Devices supporting the RDS output API set the ``V4L2_CAP_RDS_OUTPUT`` +flag in the ``capabilities`` field of struct +:c:type:`v4l2_capability` returned by the +:ref:`VIDIOC_QUERYCAP` ioctl. Any modulator that +supports RDS will set the ``V4L2_TUNER_CAP_RDS`` flag in the +``capability`` field of struct +:c:type:`v4l2_modulator`. In order to enable the RDS +transmission one must set the ``V4L2_TUNER_SUB_RDS`` bit in the +``txsubchans`` field of struct +:c:type:`v4l2_modulator`. If the driver only passes RDS +blocks without interpreting the data the ``V4L2_TUNER_CAP_RDS_BLOCK_IO`` +flag has to be set. If the tuner is capable of handling RDS entities +like program identification codes and radio text, the flag +``V4L2_TUNER_CAP_RDS_CONTROLS`` should be set, see +:ref:`Writing RDS data ` and +:ref:`FM Transmitter Control Reference `. + +.. _reading-rds-data: + +Reading RDS data +================ + +RDS data can be read from the radio device with the +:c:func:`read()` function. The data is packed in groups of +three bytes. + +.. _writing-rds-data: + +Writing RDS data +================ + +RDS data can be written to the radio device with the +:c:func:`write()` function. The data is packed in groups of +three bytes, as follows: + +RDS datastructures +================== + +.. c:type:: v4l2_rds_data + +.. flat-table:: struct v4l2_rds_data + :header-rows: 0 + :stub-columns: 0 + :widths: 1 1 5 + + * - __u8 + - ``lsb`` + - Least Significant Byte of RDS Block + * - __u8 + - ``msb`` + - Most Significant Byte of RDS Block + * - __u8 + - ``block`` + - Block description + + +.. _v4l2-rds-block: + +.. tabularcolumns:: |p{2.9cm}|p{14.6cm}| + +.. flat-table:: Block description + :header-rows: 0 + :stub-columns: 0 + :widths: 1 5 + + * - Bits 0-2 + - Block (aka offset) of the received data. + * - Bits 3-5 + - Deprecated. Currently identical to bits 0-2. Do not use these + bits. + * - Bit 6 + - Corrected bit. Indicates that an error was corrected for this data + block. + * - Bit 7 + - Error bit. Indicates that an uncorrectable error occurred during + reception of this block. + + +.. _v4l2-rds-block-codes: + +.. tabularcolumns:: |p{6.4cm}|p{2.0cm}|p{1.2cm}|p{7.0cm}| + +.. flat-table:: Block defines + :header-rows: 0 + :stub-columns: 0 + :widths: 1 1 1 5 + + * - V4L2_RDS_BLOCK_MSK + - + - 7 + - Mask for bits 0-2 to get the block ID. + * - V4L2_RDS_BLOCK_A + - + - 0 + - Block A. + * - V4L2_RDS_BLOCK_B + - + - 1 + - Block B. + * - V4L2_RDS_BLOCK_C + - + - 2 + - Block C. + * - V4L2_RDS_BLOCK_D + - + - 3 + - Block D. + * - V4L2_RDS_BLOCK_C_ALT + - + - 4 + - Block C'. + * - V4L2_RDS_BLOCK_INVALID + - read-only + - 7 + - An invalid block. + * - V4L2_RDS_BLOCK_CORRECTED + - read-only + - 0x40 + - A bit error was detected but corrected. + * - V4L2_RDS_BLOCK_ERROR + - read-only + - 0x80 + - An uncorrectable error occurred. -- cgit v1.2.3