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, 591 insertions, 0 deletions

diff --git a/drivers/media/platform/st/sti/delta/delta-ipc.c b/drivers/media/platform/st/sti/delta/delta-ipc.c
new file mode 100644
index 000000000..21d3e08e2
--- /dev/null
+++ b/drivers/media/platform/st/sti/delta/delta-ipc.c
@@ -0,0 +1,591 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) STMicroelectronics SA 2015
+ * Author: Hugues Fruchet <hugues.fruchet@st.com> for STMicroelectronics.
+ */
+
+#include <linux/rpmsg.h>
+
+#include "delta.h"
+#include "delta-ipc.h"
+#include "delta-mem.h"
+
+#define IPC_TIMEOUT 100
+#define IPC_SANITY_TAG 0xDEADBEEF
+
+enum delta_ipc_fw_command {
+	DELTA_IPC_OPEN,
+	DELTA_IPC_SET_STREAM,
+	DELTA_IPC_DECODE,
+	DELTA_IPC_CLOSE
+};
+
+#define to_rpmsg_driver(__drv) container_of(__drv, struct rpmsg_driver, drv)
+#define to_delta(__d) container_of(__d, struct delta_dev, rpmsg_driver)
+
+#define to_ctx(hdl) ((struct delta_ipc_ctx *)hdl)
+#define to_pctx(ctx) container_of(ctx, struct delta_ctx, ipc_ctx)
+
+struct delta_ipc_header_msg {
+	u32 tag;
+	void *host_hdl;
+	u32 copro_hdl;
+	u32 command;
+};
+
+#define to_host_hdl(ctx) ((void *)ctx)
+
+#define msg_to_ctx(msg) ((struct delta_ipc_ctx *)(msg)->header.host_hdl)
+#define msg_to_copro_hdl(msg) ((msg)->header.copro_hdl)
+
+static inline dma_addr_t to_paddr(struct delta_ipc_ctx *ctx, void *vaddr)
+{
+	return (ctx->ipc_buf->paddr + (vaddr - ctx->ipc_buf->vaddr));
+}
+
+static inline bool is_valid_data(struct delta_ipc_ctx *ctx,
+				 void *data, u32 size)
+{
+	return ((data >= ctx->ipc_buf->vaddr) &&
+		((data + size) <= (ctx->ipc_buf->vaddr + ctx->ipc_buf->size)));
+}
+
+/*
+ * IPC shared memory (@ipc_buf_size, @ipc_buf_paddr) is sent to copro
+ * at each instance opening. This memory is allocated by IPC client
+ * and given through delta_ipc_open(). All messages parameters
+ * (open, set_stream, decode) will have their phy address within
+ * this IPC shared memory, avoiding de-facto recopies inside delta-ipc.
+ * All the below messages structures are used on both host and firmware
+ * side and are packed (use only of 32 bits size fields in messages
+ * structures to ensure packing):
+ * - struct delta_ipc_open_msg
+ * - struct delta_ipc_set_stream_msg
+ * - struct delta_ipc_decode_msg
+ * - struct delta_ipc_close_msg
+ * - struct delta_ipc_cb_msg
+ */
+struct delta_ipc_open_msg {
+	struct delta_ipc_header_msg header;
+	u32 ipc_buf_size;
+	dma_addr_t ipc_buf_paddr;
+	char name[32];
+	u32 param_size;
+	dma_addr_t param_paddr;
+};
+
+struct delta_ipc_set_stream_msg {
+	struct delta_ipc_header_msg header;
+	u32 param_size;
+	dma_addr_t param_paddr;
+};
+
+struct delta_ipc_decode_msg {
+	struct delta_ipc_header_msg header;
+	u32 param_size;
+	dma_addr_t param_paddr;
+	u32 status_size;
+	dma_addr_t status_paddr;
+};
+
+struct delta_ipc_close_msg {
+	struct delta_ipc_header_msg header;
+};
+
+struct delta_ipc_cb_msg {
+	struct delta_ipc_header_msg header;
+	int err;
+};
+
+static void build_msg_header(struct delta_ipc_ctx *ctx,
+			     enum delta_ipc_fw_command command,
+			     struct delta_ipc_header_msg *header)
+{
+	header->tag = IPC_SANITY_TAG;
+	header->host_hdl = to_host_hdl(ctx);
+	header->copro_hdl = ctx->copro_hdl;
+	header->command = command;
+}
+
+int delta_ipc_open(struct delta_ctx *pctx, const char *name,
+		   struct delta_ipc_param *param, u32 ipc_buf_size,
+		   struct delta_buf **ipc_buf, void **hdl)
+{
+	struct delta_dev *delta = pctx->dev;
+	struct rpmsg_device *rpmsg_device = delta->rpmsg_device;
+	struct delta_ipc_ctx *ctx = &pctx->ipc_ctx;
+	struct delta_ipc_open_msg msg;
+	struct delta_buf *buf = &ctx->ipc_buf_struct;
+	int ret;
+
+	if (!rpmsg_device) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to open, rpmsg is not initialized\n",
+			pctx->name);
+		pctx->sys_errors++;
+		return -EINVAL;
+	}
+
+	if (!name) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to open, no name given\n",
+			pctx->name);
+		return -EINVAL;
+	}
+
+	if (!param || !param->data || !param->size) {
+		dev_err(delta->dev,
+			"%s  ipc: failed to open, empty parameter\n",
+			pctx->name);
+		return -EINVAL;
+	}
+
+	if (!ipc_buf_size) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to open, no size given for ipc buffer\n",
+			pctx->name);
+		return -EINVAL;
+	}
+
+	if (param->size > ipc_buf_size) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to open, too large ipc parameter (%d bytes while max %d expected)\n",
+			pctx->name,
+			param->size, ctx->ipc_buf->size);
+		return -EINVAL;
+	}
+
+	/* init */
+	init_completion(&ctx->done);
+
+	/*
+	 * allocation of contiguous buffer for
+	 * data of commands exchanged between
+	 * host and firmware coprocessor
+	 */
+	ret = hw_alloc(pctx, ipc_buf_size,
+		       "ipc data buffer", buf);
+	if (ret)
+		return ret;
+	ctx->ipc_buf = buf;
+
+	/* build rpmsg message */
+	build_msg_header(ctx, DELTA_IPC_OPEN, &msg.header);
+
+	msg.ipc_buf_size = ipc_buf_size;
+	msg.ipc_buf_paddr = ctx->ipc_buf->paddr;
+
+	strscpy(msg.name, name, sizeof(msg.name));
+
+	msg.param_size = param->size;
+	memcpy(ctx->ipc_buf->vaddr, param->data, msg.param_size);
+	msg.param_paddr = ctx->ipc_buf->paddr;
+
+	/* send it */
+	ret = rpmsg_send(rpmsg_device->ept, &msg, sizeof(msg));
+	if (ret) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to open, rpmsg_send failed (%d) for DELTA_IPC_OPEN (name=%s, size=%d, data=%p)\n",
+			pctx->name,
+			ret, name, param->size, param->data);
+		goto err;
+	}
+
+	/* wait for acknowledge */
+	if (!wait_for_completion_timeout
+	    (&ctx->done, msecs_to_jiffies(IPC_TIMEOUT))) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to open, timeout waiting for DELTA_IPC_OPEN callback (name=%s, size=%d, data=%p)\n",
+			pctx->name,
+			name, param->size, param->data);
+		ret = -ETIMEDOUT;
+		goto err;
+	}
+
+	/* command completed, check error */
+	if (ctx->cb_err) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to open, DELTA_IPC_OPEN completed but with error (%d) (name=%s, size=%d, data=%p)\n",
+			pctx->name,
+			ctx->cb_err, name, param->size, param->data);
+		ret = -EIO;
+		goto err;
+	}
+
+	*ipc_buf = ctx->ipc_buf;
+	*hdl = (void *)ctx;
+
+	return 0;
+
+err:
+	pctx->sys_errors++;
+	hw_free(pctx, ctx->ipc_buf);
+	ctx->ipc_buf = NULL;
+
+	return ret;
+};
+
+int delta_ipc_set_stream(void *hdl, struct delta_ipc_param *param)
+{
+	struct delta_ipc_ctx *ctx = to_ctx(hdl);
+	struct delta_ctx *pctx = to_pctx(ctx);
+	struct delta_dev *delta = pctx->dev;
+	struct rpmsg_device *rpmsg_device = delta->rpmsg_device;
+	struct delta_ipc_set_stream_msg msg;
+	int ret;
+
+	if (!hdl) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to set stream, invalid ipc handle\n",
+			pctx->name);
+		return -EINVAL;
+	}
+
+	if (!rpmsg_device) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to set stream, rpmsg is not initialized\n",
+			pctx->name);
+		return -EINVAL;
+	}
+
+	if (!param || !param->data || !param->size) {
+		dev_err(delta->dev,
+			"%s  ipc: failed to set stream, empty parameter\n",
+			pctx->name);
+		return -EINVAL;
+	}
+
+	if (param->size > ctx->ipc_buf->size) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to set stream, too large ipc parameter(%d bytes while max %d expected)\n",
+			pctx->name,
+			param->size, ctx->ipc_buf->size);
+		return -EINVAL;
+	}
+
+	if (!is_valid_data(ctx, param->data, param->size)) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to set stream, parameter is not in expected address range (size=%d, data=%p not in %p..%p)\n",
+			pctx->name,
+			param->size,
+			param->data,
+			ctx->ipc_buf->vaddr,
+			ctx->ipc_buf->vaddr + ctx->ipc_buf->size - 1);
+		return -EINVAL;
+	}
+
+	/* build rpmsg message */
+	build_msg_header(ctx, DELTA_IPC_SET_STREAM, &msg.header);
+
+	msg.param_size = param->size;
+	msg.param_paddr = to_paddr(ctx, param->data);
+
+	/* send it */
+	ret = rpmsg_send(rpmsg_device->ept, &msg, sizeof(msg));
+	if (ret) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to set stream, rpmsg_send failed (%d) for DELTA_IPC_SET_STREAM (size=%d, data=%p)\n",
+			pctx->name,
+			ret, param->size, param->data);
+		pctx->sys_errors++;
+		return ret;
+	}
+
+	/* wait for acknowledge */
+	if (!wait_for_completion_timeout
+	    (&ctx->done, msecs_to_jiffies(IPC_TIMEOUT))) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to set stream, timeout waiting for DELTA_IPC_SET_STREAM callback (size=%d, data=%p)\n",
+			pctx->name,
+			param->size, param->data);
+		pctx->sys_errors++;
+		return -ETIMEDOUT;
+	}
+
+	/* command completed, check status */
+	if (ctx->cb_err) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to set stream, DELTA_IPC_SET_STREAM completed but with error (%d) (size=%d, data=%p)\n",
+			pctx->name,
+			ctx->cb_err, param->size, param->data);
+		pctx->sys_errors++;
+		return -EIO;
+	}
+
+	return 0;
+}
+
+int delta_ipc_decode(void *hdl, struct delta_ipc_param *param,
+		     struct delta_ipc_param *status)
+{
+	struct delta_ipc_ctx *ctx = to_ctx(hdl);
+	struct delta_ctx *pctx = to_pctx(ctx);
+	struct delta_dev *delta = pctx->dev;
+	struct rpmsg_device *rpmsg_device = delta->rpmsg_device;
+	struct delta_ipc_decode_msg msg;
+	int ret;
+
+	if (!hdl) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to decode, invalid ipc handle\n",
+			pctx->name);
+		return -EINVAL;
+	}
+
+	if (!rpmsg_device) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to decode, rpmsg is not initialized\n",
+			pctx->name);
+		return -EINVAL;
+	}
+
+	if (!param || !param->data || !param->size) {
+		dev_err(delta->dev,
+			"%s  ipc: failed to decode, empty parameter\n",
+			pctx->name);
+		return -EINVAL;
+	}
+
+	if (!status || !status->data || !status->size) {
+		dev_err(delta->dev,
+			"%s  ipc: failed to decode, empty status\n",
+			pctx->name);
+		return -EINVAL;
+	}
+
+	if (param->size + status->size > ctx->ipc_buf->size) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to decode, too large ipc parameter (%d bytes (param) + %d bytes (status) while max %d expected)\n",
+			pctx->name,
+			param->size,
+			status->size,
+			ctx->ipc_buf->size);
+		return -EINVAL;
+	}
+
+	if (!is_valid_data(ctx, param->data, param->size)) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to decode, parameter is not in expected address range (size=%d, data=%p not in %p..%p)\n",
+			pctx->name,
+			param->size,
+			param->data,
+			ctx->ipc_buf->vaddr,
+			ctx->ipc_buf->vaddr + ctx->ipc_buf->size - 1);
+		return -EINVAL;
+	}
+
+	if (!is_valid_data(ctx, status->data, status->size)) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to decode, status is not in expected address range (size=%d, data=%p not in %p..%p)\n",
+			pctx->name,
+			status->size,
+			status->data,
+			ctx->ipc_buf->vaddr,
+			ctx->ipc_buf->vaddr + ctx->ipc_buf->size - 1);
+		return -EINVAL;
+	}
+
+	/* build rpmsg message */
+	build_msg_header(ctx, DELTA_IPC_DECODE, &msg.header);
+
+	msg.param_size = param->size;
+	msg.param_paddr = to_paddr(ctx, param->data);
+
+	msg.status_size = status->size;
+	msg.status_paddr = to_paddr(ctx, status->data);
+
+	/* send it */
+	ret = rpmsg_send(rpmsg_device->ept, &msg, sizeof(msg));
+	if (ret) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to decode, rpmsg_send failed (%d) for DELTA_IPC_DECODE (size=%d, data=%p)\n",
+			pctx->name,
+			ret, param->size, param->data);
+		pctx->sys_errors++;
+		return ret;
+	}
+
+	/* wait for acknowledge */
+	if (!wait_for_completion_timeout
+	    (&ctx->done, msecs_to_jiffies(IPC_TIMEOUT))) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to decode, timeout waiting for DELTA_IPC_DECODE callback (size=%d, data=%p)\n",
+			pctx->name,
+			param->size, param->data);
+		pctx->sys_errors++;
+		return -ETIMEDOUT;
+	}
+
+	/* command completed, check status */
+	if (ctx->cb_err) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to decode, DELTA_IPC_DECODE completed but with error (%d) (size=%d, data=%p)\n",
+			pctx->name,
+			ctx->cb_err, param->size, param->data);
+		pctx->sys_errors++;
+		return -EIO;
+	}
+
+	return 0;
+};
+
+void delta_ipc_close(void *hdl)
+{
+	struct delta_ipc_ctx *ctx = to_ctx(hdl);
+	struct delta_ctx *pctx = to_pctx(ctx);
+	struct delta_dev *delta = pctx->dev;
+	struct rpmsg_device *rpmsg_device = delta->rpmsg_device;
+	struct delta_ipc_close_msg msg;
+	int ret;
+
+	if (!hdl) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to close, invalid ipc handle\n",
+			pctx->name);
+		return;
+	}
+
+	if (ctx->ipc_buf) {
+		hw_free(pctx, ctx->ipc_buf);
+		ctx->ipc_buf = NULL;
+	}
+
+	if (!rpmsg_device) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to close, rpmsg is not initialized\n",
+			pctx->name);
+		return;
+	}
+
+	/* build rpmsg message */
+	build_msg_header(ctx, DELTA_IPC_CLOSE, &msg.header);
+
+	/* send it */
+	ret = rpmsg_send(rpmsg_device->ept, &msg, sizeof(msg));
+	if (ret) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to close, rpmsg_send failed (%d) for DELTA_IPC_CLOSE\n",
+			pctx->name, ret);
+		pctx->sys_errors++;
+		return;
+	}
+
+	/* wait for acknowledge */
+	if (!wait_for_completion_timeout
+	    (&ctx->done, msecs_to_jiffies(IPC_TIMEOUT))) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to close, timeout waiting for DELTA_IPC_CLOSE callback\n",
+			pctx->name);
+		pctx->sys_errors++;
+		return;
+	}
+
+	/* command completed, check status */
+	if (ctx->cb_err) {
+		dev_err(delta->dev,
+			"%s   ipc: failed to close, DELTA_IPC_CLOSE completed but with error (%d)\n",
+			pctx->name, ctx->cb_err);
+		pctx->sys_errors++;
+	}
+};
+
+static int delta_ipc_cb(struct rpmsg_device *rpdev, void *data,
+			int len, void *priv, u32 src)
+{
+	struct delta_ipc_ctx *ctx;
+	struct delta_ipc_cb_msg *msg;
+
+	/* sanity check */
+	if (!rpdev) {
+		dev_err(NULL, "rpdev is NULL\n");
+		return -EINVAL;
+	}
+
+	if (!data || !len) {
+		dev_err(&rpdev->dev,
+			"unexpected empty message received from src=%d\n", src);
+		return -EINVAL;
+	}
+
+	if (len != sizeof(*msg)) {
+		dev_err(&rpdev->dev,
+			"unexpected message length received from src=%d (received %d bytes while %zu bytes expected)\n",
+			len, src, sizeof(*msg));
+		return -EINVAL;
+	}
+
+	msg = (struct delta_ipc_cb_msg *)data;
+	if (msg->header.tag != IPC_SANITY_TAG) {
+		dev_err(&rpdev->dev,
+			"unexpected message tag received from src=%d (received %x tag while %x expected)\n",
+			src, msg->header.tag, IPC_SANITY_TAG);
+		return -EINVAL;
+	}
+
+	ctx = msg_to_ctx(msg);
+	if (!ctx) {
+		dev_err(&rpdev->dev,
+			"unexpected message with NULL host_hdl received from src=%d\n",
+			src);
+		return -EINVAL;
+	}
+
+	/*
+	 * if not already known, save copro instance context
+	 * to ensure re-entrance on copro side
+	 */
+	if (!ctx->copro_hdl)
+		ctx->copro_hdl = msg_to_copro_hdl(msg);
+
+	/*
+	 * all is fine,
+	 * update status & complete command
+	 */
+	ctx->cb_err = msg->err;
+	complete(&ctx->done);
+
+	return 0;
+}
+
+static int delta_ipc_probe(struct rpmsg_device *rpmsg_device)
+{
+	struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpmsg_device->dev.driver);
+	struct delta_dev *delta = to_delta(rpdrv);
+
+	delta->rpmsg_device = rpmsg_device;
+
+	return 0;
+}
+
+static void delta_ipc_remove(struct rpmsg_device *rpmsg_device)
+{
+	struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpmsg_device->dev.driver);
+	struct delta_dev *delta = to_delta(rpdrv);
+
+	delta->rpmsg_device = NULL;
+}
+
+static struct rpmsg_device_id delta_ipc_device_id_table[] = {
+	{.name = "rpmsg-delta"},
+	{},
+};
+
+static struct rpmsg_driver delta_rpmsg_driver = {
+	.drv = {.name = KBUILD_MODNAME},
+	.id_table = delta_ipc_device_id_table,
+	.probe = delta_ipc_probe,
+	.callback = delta_ipc_cb,
+	.remove = delta_ipc_remove,
+};
+
+int delta_ipc_init(struct delta_dev *delta)
+{
+	delta->rpmsg_driver = delta_rpmsg_driver;
+
+	return register_rpmsg_driver(&delta->rpmsg_driver);
+}
+
+void delta_ipc_exit(struct delta_dev *delta)
+{
+	unregister_rpmsg_driver(&delta->rpmsg_driver);
+}