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, 874 insertions, 0 deletions

diff --git a/drivers/media/pci/cx18/cx18-fileops.c b/drivers/media/pci/cx18/cx18-fileops.c
new file mode 100644
index 000000000..4cf5b9ca9
--- /dev/null
+++ b/drivers/media/pci/cx18/cx18-fileops.c
@@ -0,0 +1,874 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  cx18 file operation functions
+ *
+ *  Derived from ivtv-fileops.c
+ *
+ *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
+ *  Copyright (C) 2008  Andy Walls <awalls@md.metrocast.net>
+ */
+
+#include "cx18-driver.h"
+#include "cx18-fileops.h"
+#include "cx18-i2c.h"
+#include "cx18-queue.h"
+#include "cx18-vbi.h"
+#include "cx18-audio.h"
+#include "cx18-mailbox.h"
+#include "cx18-scb.h"
+#include "cx18-streams.h"
+#include "cx18-controls.h"
+#include "cx18-ioctl.h"
+#include "cx18-cards.h"
+#include <media/v4l2-event.h>
+
+/* This function tries to claim the stream for a specific file descriptor.
+   If no one else is using this stream then the stream is claimed and
+   associated VBI and IDX streams are also automatically claimed.
+   Possible error returns: -EBUSY if someone else has claimed
+   the stream or 0 on success. */
+int cx18_claim_stream(struct cx18_open_id *id, int type)
+{
+	struct cx18 *cx = id->cx;
+	struct cx18_stream *s = &cx->streams[type];
+	struct cx18_stream *s_assoc;
+
+	/* Nothing should ever try to directly claim the IDX stream */
+	if (type == CX18_ENC_STREAM_TYPE_IDX) {
+		CX18_WARN("MPEG Index stream cannot be claimed directly, but something tried.\n");
+		return -EINVAL;
+	}
+
+	if (test_and_set_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
+		/* someone already claimed this stream */
+		if (s->id == id->open_id) {
+			/* yes, this file descriptor did. So that's OK. */
+			return 0;
+		}
+		if (s->id == -1 && type == CX18_ENC_STREAM_TYPE_VBI) {
+			/* VBI is handled already internally, now also assign
+			   the file descriptor to this stream for external
+			   reading of the stream. */
+			s->id = id->open_id;
+			CX18_DEBUG_INFO("Start Read VBI\n");
+			return 0;
+		}
+		/* someone else is using this stream already */
+		CX18_DEBUG_INFO("Stream %d is busy\n", type);
+		return -EBUSY;
+	}
+	s->id = id->open_id;
+
+	/*
+	 * CX18_ENC_STREAM_TYPE_MPG needs to claim:
+	 * CX18_ENC_STREAM_TYPE_VBI, if VBI insertion is on for sliced VBI, or
+	 * CX18_ENC_STREAM_TYPE_IDX, if VBI insertion is off for sliced VBI
+	 * (We don't yet fix up MPEG Index entries for our inserted packets).
+	 *
+	 * For all other streams we're done.
+	 */
+	if (type != CX18_ENC_STREAM_TYPE_MPG)
+		return 0;
+
+	s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
+	if (cx->vbi.insert_mpeg && !cx18_raw_vbi(cx))
+		s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
+	else if (!cx18_stream_enabled(s_assoc))
+		return 0;
+
+	set_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
+
+	/* mark that it is used internally */
+	set_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags);
+	return 0;
+}
+EXPORT_SYMBOL(cx18_claim_stream);
+
+/* This function releases a previously claimed stream. It will take into
+   account associated VBI streams. */
+void cx18_release_stream(struct cx18_stream *s)
+{
+	struct cx18 *cx = s->cx;
+	struct cx18_stream *s_assoc;
+
+	s->id = -1;
+	if (s->type == CX18_ENC_STREAM_TYPE_IDX) {
+		/*
+		 * The IDX stream is only used internally, and can
+		 * only be indirectly unclaimed by unclaiming the MPG stream.
+		 */
+		return;
+	}
+
+	if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
+		test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags)) {
+		/* this stream is still in use internally */
+		return;
+	}
+	if (!test_and_clear_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
+		CX18_DEBUG_WARN("Release stream %s not in use!\n", s->name);
+		return;
+	}
+
+	cx18_flush_queues(s);
+
+	/*
+	 * CX18_ENC_STREAM_TYPE_MPG needs to release the
+	 * CX18_ENC_STREAM_TYPE_VBI and/or CX18_ENC_STREAM_TYPE_IDX streams.
+	 *
+	 * For all other streams we're done.
+	 */
+	if (s->type != CX18_ENC_STREAM_TYPE_MPG)
+		return;
+
+	/* Unclaim the associated MPEG Index stream */
+	s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
+	if (test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags)) {
+		clear_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
+		cx18_flush_queues(s_assoc);
+	}
+
+	/* Unclaim the associated VBI stream */
+	s_assoc = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
+	if (test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_assoc->s_flags)) {
+		if (s_assoc->id == -1) {
+			/*
+			 * The VBI stream is not still claimed by a file
+			 * descriptor, so completely unclaim it.
+			 */
+			clear_bit(CX18_F_S_CLAIMED, &s_assoc->s_flags);
+			cx18_flush_queues(s_assoc);
+		}
+	}
+}
+EXPORT_SYMBOL(cx18_release_stream);
+
+static void cx18_dualwatch(struct cx18 *cx)
+{
+	struct v4l2_tuner vt;
+	u32 new_stereo_mode;
+	const u32 dual = 0x0200;
+
+	new_stereo_mode = v4l2_ctrl_g_ctrl(cx->cxhdl.audio_mode);
+	memset(&vt, 0, sizeof(vt));
+	cx18_call_all(cx, tuner, g_tuner, &vt);
+	if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
+			(vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
+		new_stereo_mode = dual;
+
+	if (new_stereo_mode == cx->dualwatch_stereo_mode)
+		return;
+
+	CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
+			   cx->dualwatch_stereo_mode, new_stereo_mode);
+	if (v4l2_ctrl_s_ctrl(cx->cxhdl.audio_mode, new_stereo_mode))
+		CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
+}
+
+
+static struct cx18_mdl *cx18_get_mdl(struct cx18_stream *s, int non_block,
+				     int *err)
+{
+	struct cx18 *cx = s->cx;
+	struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
+	struct cx18_mdl *mdl;
+	DEFINE_WAIT(wait);
+
+	*err = 0;
+	while (1) {
+		if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
+			/* Process pending program updates and VBI data */
+			if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
+				cx->dualwatch_jiffies = jiffies;
+				cx18_dualwatch(cx);
+			}
+			if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
+			    !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
+				while ((mdl = cx18_dequeue(s_vbi,
+							   &s_vbi->q_full))) {
+					/* byteswap and process VBI data */
+					cx18_process_vbi_data(cx, mdl,
+							      s_vbi->type);
+					cx18_stream_put_mdl_fw(s_vbi, mdl);
+				}
+			}
+			mdl = &cx->vbi.sliced_mpeg_mdl;
+			if (mdl->readpos != mdl->bytesused)
+				return mdl;
+		}
+
+		/* do we have new data? */
+		mdl = cx18_dequeue(s, &s->q_full);
+		if (mdl) {
+			if (!test_and_clear_bit(CX18_F_M_NEED_SWAP,
+						&mdl->m_flags))
+				return mdl;
+			if (s->type == CX18_ENC_STREAM_TYPE_MPG)
+				/* byteswap MPG data */
+				cx18_mdl_swap(mdl);
+			else {
+				/* byteswap and process VBI data */
+				cx18_process_vbi_data(cx, mdl, s->type);
+			}
+			return mdl;
+		}
+
+		/* return if end of stream */
+		if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
+			CX18_DEBUG_INFO("EOS %s\n", s->name);
+			return NULL;
+		}
+
+		/* return if file was opened with O_NONBLOCK */
+		if (non_block) {
+			*err = -EAGAIN;
+			return NULL;
+		}
+
+		/* wait for more data to arrive */
+		prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
+		/* New buffers might have become available before we were added
+		   to the waitqueue */
+		if (!atomic_read(&s->q_full.depth))
+			schedule();
+		finish_wait(&s->waitq, &wait);
+		if (signal_pending(current)) {
+			/* return if a signal was received */
+			CX18_DEBUG_INFO("User stopped %s\n", s->name);
+			*err = -EINTR;
+			return NULL;
+		}
+	}
+}
+
+static void cx18_setup_sliced_vbi_mdl(struct cx18 *cx)
+{
+	struct cx18_mdl *mdl = &cx->vbi.sliced_mpeg_mdl;
+	struct cx18_buffer *buf = &cx->vbi.sliced_mpeg_buf;
+	int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
+
+	buf->buf = cx->vbi.sliced_mpeg_data[idx];
+	buf->bytesused = cx->vbi.sliced_mpeg_size[idx];
+	buf->readpos = 0;
+
+	mdl->curr_buf = NULL;
+	mdl->bytesused = cx->vbi.sliced_mpeg_size[idx];
+	mdl->readpos = 0;
+}
+
+static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
+	struct cx18_buffer *buf, char __user *ubuf, size_t ucount, bool *stop)
+{
+	struct cx18 *cx = s->cx;
+	size_t len = buf->bytesused - buf->readpos;
+
+	*stop = false;
+	if (len > ucount)
+		len = ucount;
+	if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
+	    !cx18_raw_vbi(cx) && buf != &cx->vbi.sliced_mpeg_buf) {
+		/*
+		 * Try to find a good splice point in the PS, just before
+		 * an MPEG-2 Program Pack start code, and provide only
+		 * up to that point to the user, so it's easy to insert VBI data
+		 * the next time around.
+		 *
+		 * This will not work for an MPEG-2 TS and has only been
+		 * verified by analysis to work for an MPEG-2 PS.  Helen Buus
+		 * pointed out this works for the CX23416 MPEG-2 DVD compatible
+		 * stream, and research indicates both the MPEG 2 SVCD and DVD
+		 * stream types use an MPEG-2 PS container.
+		 */
+		/*
+		 * An MPEG-2 Program Stream (PS) is a series of
+		 * MPEG-2 Program Packs terminated by an
+		 * MPEG Program End Code after the last Program Pack.
+		 * A Program Pack may hold a PS System Header packet and any
+		 * number of Program Elementary Stream (PES) Packets
+		 */
+		const char *start = buf->buf + buf->readpos;
+		const char *p = start + 1;
+		const u8 *q;
+		u8 ch = cx->search_pack_header ? 0xba : 0xe0;
+		int stuffing, i;
+
+		while (start + len > p) {
+			/* Scan for a 0 to find a potential MPEG-2 start code */
+			q = memchr(p, 0, start + len - p);
+			if (q == NULL)
+				break;
+			p = q + 1;
+			/*
+			 * Keep looking if not a
+			 * MPEG-2 Pack header start code:  0x00 0x00 0x01 0xba
+			 * or MPEG-2 video PES start code: 0x00 0x00 0x01 0xe0
+			 */
+			if ((char *)q + 15 >= buf->buf + buf->bytesused ||
+			    q[1] != 0 || q[2] != 1 || q[3] != ch)
+				continue;
+
+			/* If expecting the primary video PES */
+			if (!cx->search_pack_header) {
+				/* Continue if it couldn't be a PES packet */
+				if ((q[6] & 0xc0) != 0x80)
+					continue;
+				/* Check if a PTS or PTS & DTS follow */
+				if (((q[7] & 0xc0) == 0x80 &&  /* PTS only */
+				     (q[9] & 0xf0) == 0x20) || /* PTS only */
+				    ((q[7] & 0xc0) == 0xc0 &&  /* PTS & DTS */
+				     (q[9] & 0xf0) == 0x30)) { /* DTS follows */
+					/* Assume we found the video PES hdr */
+					ch = 0xba; /* next want a Program Pack*/
+					cx->search_pack_header = 1;
+					p = q + 9; /* Skip this video PES hdr */
+				}
+				continue;
+			}
+
+			/* We may have found a Program Pack start code */
+
+			/* Get the count of stuffing bytes & verify them */
+			stuffing = q[13] & 7;
+			/* all stuffing bytes must be 0xff */
+			for (i = 0; i < stuffing; i++)
+				if (q[14 + i] != 0xff)
+					break;
+			if (i == stuffing && /* right number of stuffing bytes*/
+			    (q[4] & 0xc4) == 0x44 && /* marker check */
+			    (q[12] & 3) == 3 &&  /* marker check */
+			    q[14 + stuffing] == 0 && /* PES Pack or Sys Hdr */
+			    q[15 + stuffing] == 0 &&
+			    q[16 + stuffing] == 1) {
+				/* We declare we actually found a Program Pack*/
+				cx->search_pack_header = 0; /* expect vid PES */
+				len = (char *)q - start;
+				cx18_setup_sliced_vbi_mdl(cx);
+				*stop = true;
+				break;
+			}
+		}
+	}
+	if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
+		CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
+				len, s->name);
+		return -EFAULT;
+	}
+	buf->readpos += len;
+	if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
+	    buf != &cx->vbi.sliced_mpeg_buf)
+		cx->mpg_data_received += len;
+	return len;
+}
+
+static size_t cx18_copy_mdl_to_user(struct cx18_stream *s,
+		struct cx18_mdl *mdl, char __user *ubuf, size_t ucount)
+{
+	size_t tot_written = 0;
+	int rc;
+	bool stop = false;
+
+	if (mdl->curr_buf == NULL)
+		mdl->curr_buf = list_first_entry(&mdl->buf_list,
+						 struct cx18_buffer, list);
+
+	if (list_entry_is_past_end(mdl->curr_buf, &mdl->buf_list, list)) {
+		/*
+		 * For some reason we've exhausted the buffers, but the MDL
+		 * object still said some data was unread.
+		 * Fix that and bail out.
+		 */
+		mdl->readpos = mdl->bytesused;
+		return 0;
+	}
+
+	list_for_each_entry_from(mdl->curr_buf, &mdl->buf_list, list) {
+
+		if (mdl->curr_buf->readpos >= mdl->curr_buf->bytesused)
+			continue;
+
+		rc = cx18_copy_buf_to_user(s, mdl->curr_buf, ubuf + tot_written,
+					   ucount - tot_written, &stop);
+		if (rc < 0)
+			return rc;
+		mdl->readpos += rc;
+		tot_written += rc;
+
+		if (stop ||	/* Forced stopping point for VBI insertion */
+		    tot_written >= ucount ||	/* Reader request satisfied */
+		    mdl->curr_buf->readpos < mdl->curr_buf->bytesused ||
+		    mdl->readpos >= mdl->bytesused) /* MDL buffers drained */
+			break;
+	}
+	return tot_written;
+}
+
+static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
+		size_t tot_count, int non_block)
+{
+	struct cx18 *cx = s->cx;
+	size_t tot_written = 0;
+	int single_frame = 0;
+
+	if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
+		/* shouldn't happen */
+		CX18_DEBUG_WARN("Stream %s not initialized before read\n",
+				s->name);
+		return -EIO;
+	}
+
+	/* Each VBI buffer is one frame, the v4l2 API says that for VBI the
+	   frames should arrive one-by-one, so make sure we never output more
+	   than one VBI frame at a time */
+	if (s->type == CX18_ENC_STREAM_TYPE_VBI && !cx18_raw_vbi(cx))
+		single_frame = 1;
+
+	for (;;) {
+		struct cx18_mdl *mdl;
+		int rc;
+
+		mdl = cx18_get_mdl(s, non_block, &rc);
+		/* if there is no data available... */
+		if (mdl == NULL) {
+			/* if we got data, then return that regardless */
+			if (tot_written)
+				break;
+			/* EOS condition */
+			if (rc == 0) {
+				clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
+				clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
+				cx18_release_stream(s);
+			}
+			/* set errno */
+			return rc;
+		}
+
+		rc = cx18_copy_mdl_to_user(s, mdl, ubuf + tot_written,
+				tot_count - tot_written);
+
+		if (mdl != &cx->vbi.sliced_mpeg_mdl) {
+			if (mdl->readpos == mdl->bytesused)
+				cx18_stream_put_mdl_fw(s, mdl);
+			else
+				cx18_push(s, mdl, &s->q_full);
+		} else if (mdl->readpos == mdl->bytesused) {
+			int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
+
+			cx->vbi.sliced_mpeg_size[idx] = 0;
+			cx->vbi.inserted_frame++;
+			cx->vbi_data_inserted += mdl->bytesused;
+		}
+		if (rc < 0)
+			return rc;
+		tot_written += rc;
+
+		if (tot_written == tot_count || single_frame)
+			break;
+	}
+	return tot_written;
+}
+
+static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
+		size_t count, loff_t *pos, int non_block)
+{
+	ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
+	struct cx18 *cx = s->cx;
+
+	CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
+	if (rc > 0)
+		*pos += rc;
+	return rc;
+}
+
+int cx18_start_capture(struct cx18_open_id *id)
+{
+	struct cx18 *cx = id->cx;
+	struct cx18_stream *s = &cx->streams[id->type];
+	struct cx18_stream *s_vbi;
+	struct cx18_stream *s_idx;
+
+	if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
+		/* you cannot read from these stream types. */
+		return -EPERM;
+	}
+
+	/* Try to claim this stream. */
+	if (cx18_claim_stream(id, s->type))
+		return -EBUSY;
+
+	/* If capture is already in progress, then we also have to
+	   do nothing extra. */
+	if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
+	    test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
+		set_bit(CX18_F_S_APPL_IO, &s->s_flags);
+		return 0;
+	}
+
+	/* Start associated VBI or IDX stream capture if required */
+	s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
+	s_idx = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
+	if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
+		/*
+		 * The VBI and IDX streams should have been claimed
+		 * automatically, if for internal use, when the MPG stream was
+		 * claimed.  We only need to start these streams capturing.
+		 */
+		if (test_bit(CX18_F_S_INTERNAL_USE, &s_idx->s_flags) &&
+		    !test_and_set_bit(CX18_F_S_STREAMING, &s_idx->s_flags)) {
+			if (cx18_start_v4l2_encode_stream(s_idx)) {
+				CX18_DEBUG_WARN("IDX capture start failed\n");
+				clear_bit(CX18_F_S_STREAMING, &s_idx->s_flags);
+				goto start_failed;
+			}
+			CX18_DEBUG_INFO("IDX capture started\n");
+		}
+		if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
+		    !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
+			if (cx18_start_v4l2_encode_stream(s_vbi)) {
+				CX18_DEBUG_WARN("VBI capture start failed\n");
+				clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
+				goto start_failed;
+			}
+			CX18_DEBUG_INFO("VBI insertion started\n");
+		}
+	}
+
+	/* Tell the card to start capturing */
+	if (!cx18_start_v4l2_encode_stream(s)) {
+		/* We're done */
+		set_bit(CX18_F_S_APPL_IO, &s->s_flags);
+		/* Resume a possibly paused encoder */
+		if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
+			cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
+		return 0;
+	}
+
+start_failed:
+	CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
+
+	/*
+	 * The associated VBI and IDX streams for internal use are released
+	 * automatically when the MPG stream is released.  We only need to stop
+	 * the associated stream.
+	 */
+	if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
+		/* Stop the IDX stream which is always for internal use */
+		if (test_bit(CX18_F_S_STREAMING, &s_idx->s_flags)) {
+			cx18_stop_v4l2_encode_stream(s_idx, 0);
+			clear_bit(CX18_F_S_STREAMING, &s_idx->s_flags);
+		}
+		/* Stop the VBI stream, if only running for internal use */
+		if (test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
+		    !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
+			cx18_stop_v4l2_encode_stream(s_vbi, 0);
+			clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
+		}
+	}
+	clear_bit(CX18_F_S_STREAMING, &s->s_flags);
+	cx18_release_stream(s); /* Also releases associated streams */
+	return -EIO;
+}
+
+ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
+		loff_t *pos)
+{
+	struct cx18_open_id *id = file2id(filp);
+	struct cx18 *cx = id->cx;
+	struct cx18_stream *s = &cx->streams[id->type];
+	int rc;
+
+	CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
+
+	mutex_lock(&cx->serialize_lock);
+	rc = cx18_start_capture(id);
+	mutex_unlock(&cx->serialize_lock);
+	if (rc)
+		return rc;
+
+	if ((s->vb_type == V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
+		(id->type == CX18_ENC_STREAM_TYPE_YUV)) {
+		return videobuf_read_stream(&s->vbuf_q, buf, count, pos, 0,
+			filp->f_flags & O_NONBLOCK);
+	}
+
+	return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
+}
+
+__poll_t cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
+{
+	__poll_t req_events = poll_requested_events(wait);
+	struct cx18_open_id *id = file2id(filp);
+	struct cx18 *cx = id->cx;
+	struct cx18_stream *s = &cx->streams[id->type];
+	int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
+	__poll_t res = 0;
+
+	/* Start a capture if there is none */
+	if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags) &&
+			(req_events & (EPOLLIN | EPOLLRDNORM))) {
+		int rc;
+
+		mutex_lock(&cx->serialize_lock);
+		rc = cx18_start_capture(id);
+		mutex_unlock(&cx->serialize_lock);
+		if (rc) {
+			CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
+					s->name, rc);
+			return EPOLLERR;
+		}
+		CX18_DEBUG_FILE("Encoder poll started capture\n");
+	}
+
+	if ((s->vb_type == V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
+		(id->type == CX18_ENC_STREAM_TYPE_YUV)) {
+		__poll_t videobuf_poll = videobuf_poll_stream(filp, &s->vbuf_q, wait);
+
+		if (v4l2_event_pending(&id->fh))
+			res |= EPOLLPRI;
+		if (eof && videobuf_poll == EPOLLERR)
+			return res | EPOLLHUP;
+		return res | videobuf_poll;
+	}
+
+	/* add stream's waitq to the poll list */
+	CX18_DEBUG_HI_FILE("Encoder poll\n");
+	if (v4l2_event_pending(&id->fh))
+		res |= EPOLLPRI;
+	else
+		poll_wait(filp, &s->waitq, wait);
+
+	if (atomic_read(&s->q_full.depth))
+		return res | EPOLLIN | EPOLLRDNORM;
+	if (eof)
+		return res | EPOLLHUP;
+	return res;
+}
+
+int cx18_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct cx18_open_id *id = file->private_data;
+	struct cx18 *cx = id->cx;
+	struct cx18_stream *s = &cx->streams[id->type];
+	int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
+
+	if ((s->vb_type == V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
+		(id->type == CX18_ENC_STREAM_TYPE_YUV)) {
+
+		/* Start a capture if there is none */
+		if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
+			int rc;
+
+			mutex_lock(&cx->serialize_lock);
+			rc = cx18_start_capture(id);
+			mutex_unlock(&cx->serialize_lock);
+			if (rc) {
+				CX18_DEBUG_INFO(
+					"Could not start capture for %s (%d)\n",
+					s->name, rc);
+				return -EINVAL;
+			}
+			CX18_DEBUG_FILE("Encoder mmap started capture\n");
+		}
+
+		return videobuf_mmap_mapper(&s->vbuf_q, vma);
+	}
+
+	return -EINVAL;
+}
+
+void cx18_vb_timeout(struct timer_list *t)
+{
+	struct cx18_stream *s = from_timer(s, t, vb_timeout);
+	struct cx18_videobuf_buffer *buf;
+	unsigned long flags;
+
+	/* Return all of the buffers in error state, so the vbi/vid inode
+	 * can return from blocking.
+	 */
+	spin_lock_irqsave(&s->vb_lock, flags);
+	while (!list_empty(&s->vb_capture)) {
+		buf = list_entry(s->vb_capture.next,
+			struct cx18_videobuf_buffer, vb.queue);
+		list_del(&buf->vb.queue);
+		buf->vb.state = VIDEOBUF_ERROR;
+		wake_up(&buf->vb.done);
+	}
+	spin_unlock_irqrestore(&s->vb_lock, flags);
+}
+
+void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
+{
+	struct cx18 *cx = id->cx;
+	struct cx18_stream *s = &cx->streams[id->type];
+	struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
+	struct cx18_stream *s_idx = &cx->streams[CX18_ENC_STREAM_TYPE_IDX];
+
+	CX18_DEBUG_IOCTL("close() of %s\n", s->name);
+
+	/* 'Unclaim' this stream */
+
+	/* Stop capturing */
+	if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
+		CX18_DEBUG_INFO("close stopping capture\n");
+		if (id->type == CX18_ENC_STREAM_TYPE_MPG) {
+			/* Stop internal use associated VBI and IDX streams */
+			if (test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
+			    !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
+				CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
+				cx18_stop_v4l2_encode_stream(s_vbi, 0);
+			}
+			if (test_bit(CX18_F_S_STREAMING, &s_idx->s_flags)) {
+				CX18_DEBUG_INFO("close stopping IDX capture\n");
+				cx18_stop_v4l2_encode_stream(s_idx, 0);
+			}
+		}
+		if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
+		    test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
+			/* Also used internally, don't stop capturing */
+			s->id = -1;
+		else
+			cx18_stop_v4l2_encode_stream(s, gop_end);
+	}
+	if (!gop_end) {
+		clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
+		clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
+		cx18_release_stream(s);
+	}
+}
+
+int cx18_v4l2_close(struct file *filp)
+{
+	struct v4l2_fh *fh = filp->private_data;
+	struct cx18_open_id *id = fh2id(fh);
+	struct cx18 *cx = id->cx;
+	struct cx18_stream *s = &cx->streams[id->type];
+
+	CX18_DEBUG_IOCTL("close() of %s\n", s->name);
+
+	mutex_lock(&cx->serialize_lock);
+	/* Stop radio */
+	if (id->type == CX18_ENC_STREAM_TYPE_RAD &&
+			v4l2_fh_is_singular_file(filp)) {
+		/* Closing radio device, return to TV mode */
+		cx18_mute(cx);
+		/* Mark that the radio is no longer in use */
+		clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
+		/* Switch tuner to TV */
+		cx18_call_all(cx, video, s_std, cx->std);
+		/* Select correct audio input (i.e. TV tuner or Line in) */
+		cx18_audio_set_io(cx);
+		if (atomic_read(&cx->ana_capturing) > 0) {
+			/* Undo video mute */
+			cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
+			    (v4l2_ctrl_g_ctrl(cx->cxhdl.video_mute) |
+			    (v4l2_ctrl_g_ctrl(cx->cxhdl.video_mute_yuv) << 8)));
+		}
+		/* Done! Unmute and continue. */
+		cx18_unmute(cx);
+	}
+
+	v4l2_fh_del(fh);
+	v4l2_fh_exit(fh);
+
+	/* 'Unclaim' this stream */
+	if (s->id == id->open_id)
+		cx18_stop_capture(id, 0);
+	kfree(id);
+	mutex_unlock(&cx->serialize_lock);
+	return 0;
+}
+
+static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
+{
+	struct cx18 *cx = s->cx;
+	struct cx18_open_id *item;
+
+	CX18_DEBUG_FILE("open %s\n", s->name);
+
+	/* Allocate memory */
+	item = kzalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
+	if (NULL == item) {
+		CX18_DEBUG_WARN("nomem on v4l2 open\n");
+		return -ENOMEM;
+	}
+	v4l2_fh_init(&item->fh, &s->video_dev);
+
+	item->cx = cx;
+	item->type = s->type;
+
+	item->open_id = cx->open_id++;
+	filp->private_data = &item->fh;
+	v4l2_fh_add(&item->fh);
+
+	if (item->type == CX18_ENC_STREAM_TYPE_RAD &&
+			v4l2_fh_is_singular_file(filp)) {
+		if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
+			if (atomic_read(&cx->ana_capturing) > 0) {
+				/* switching to radio while capture is
+				   in progress is not polite */
+				v4l2_fh_del(&item->fh);
+				v4l2_fh_exit(&item->fh);
+				kfree(item);
+				return -EBUSY;
+			}
+		}
+
+		/* Mark that the radio is being used. */
+		set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
+		/* We have the radio */
+		cx18_mute(cx);
+		/* Switch tuner to radio */
+		cx18_call_all(cx, tuner, s_radio);
+		/* Select the correct audio input (i.e. radio tuner) */
+		cx18_audio_set_io(cx);
+		/* Done! Unmute and continue. */
+		cx18_unmute(cx);
+	}
+	return 0;
+}
+
+int cx18_v4l2_open(struct file *filp)
+{
+	int res;
+	struct video_device *video_dev = video_devdata(filp);
+	struct cx18_stream *s = video_get_drvdata(video_dev);
+	struct cx18 *cx = s->cx;
+
+	mutex_lock(&cx->serialize_lock);
+	if (cx18_init_on_first_open(cx)) {
+		CX18_ERR("Failed to initialize on %s\n",
+			 video_device_node_name(video_dev));
+		mutex_unlock(&cx->serialize_lock);
+		return -ENXIO;
+	}
+	res = cx18_serialized_open(s, filp);
+	mutex_unlock(&cx->serialize_lock);
+	return res;
+}
+
+void cx18_mute(struct cx18 *cx)
+{
+	u32 h;
+	if (atomic_read(&cx->ana_capturing)) {
+		h = cx18_find_handle(cx);
+		if (h != CX18_INVALID_TASK_HANDLE)
+			cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 1);
+		else
+			CX18_ERR("Can't find valid task handle for mute\n");
+	}
+	CX18_DEBUG_INFO("Mute\n");
+}
+
+void cx18_unmute(struct cx18 *cx)
+{
+	u32 h;
+	if (atomic_read(&cx->ana_capturing)) {
+		h = cx18_find_handle(cx);
+		if (h != CX18_INVALID_TASK_HANDLE) {
+			cx18_msleep_timeout(100, 0);
+			cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, h, 12);
+			cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 0);
+		} else
+			CX18_ERR("Can't find valid task handle for unmute\n");
+	}
+	CX18_DEBUG_INFO("Unmute\n");
+}