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, 521 insertions, 0 deletions

diff --git a/drivers/net/wwan/t7xx/t7xx_port_proxy.c b/drivers/net/wwan/t7xx/t7xx_port_proxy.c
new file mode 100644
index 000000000..894b1d11b
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_port_proxy.c
@@ -0,0 +1,521 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ *  Amir Hanania <amir.hanania@intel.com>
+ *  Haijun Liu <haijun.liu@mediatek.com>
+ *  Moises Veleta <moises.veleta@intel.com>
+ *  Ricardo Martinez <ricardo.martinez@linux.intel.com>
+ *
+ * Contributors:
+ *  Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+ *  Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
+ *  Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
+ *  Eliot Lee <eliot.lee@intel.com>
+ *  Sreehari Kancharla <sreehari.kancharla@intel.com>
+ */
+
+#include <linux/bits.h>
+#include <linux/bitfield.h>
+#include <linux/device.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/wwan.h>
+
+#include "t7xx_hif_cldma.h"
+#include "t7xx_modem_ops.h"
+#include "t7xx_port.h"
+#include "t7xx_port_proxy.h"
+#include "t7xx_state_monitor.h"
+
+#define Q_IDX_CTRL			0
+#define Q_IDX_MBIM			2
+#define Q_IDX_AT_CMD			5
+
+#define INVALID_SEQ_NUM			GENMASK(15, 0)
+
+#define for_each_proxy_port(i, p, proxy)	\
+	for (i = 0, (p) = &(proxy)->ports[i];	\
+	     i < (proxy)->port_count;		\
+	     i++, (p) = &(proxy)->ports[i])
+
+static const struct t7xx_port_conf t7xx_md_port_conf[] = {
+	{
+		.tx_ch = PORT_CH_UART2_TX,
+		.rx_ch = PORT_CH_UART2_RX,
+		.txq_index = Q_IDX_AT_CMD,
+		.rxq_index = Q_IDX_AT_CMD,
+		.txq_exp_index = 0xff,
+		.rxq_exp_index = 0xff,
+		.path_id = CLDMA_ID_MD,
+		.ops = &wwan_sub_port_ops,
+		.name = "AT",
+		.port_type = WWAN_PORT_AT,
+	}, {
+		.tx_ch = PORT_CH_MBIM_TX,
+		.rx_ch = PORT_CH_MBIM_RX,
+		.txq_index = Q_IDX_MBIM,
+		.rxq_index = Q_IDX_MBIM,
+		.path_id = CLDMA_ID_MD,
+		.ops = &wwan_sub_port_ops,
+		.name = "MBIM",
+		.port_type = WWAN_PORT_MBIM,
+	}, {
+#ifdef CONFIG_WWAN_DEBUGFS
+		.tx_ch = PORT_CH_MD_LOG_TX,
+		.rx_ch = PORT_CH_MD_LOG_RX,
+		.txq_index = 7,
+		.rxq_index = 7,
+		.txq_exp_index = 7,
+		.rxq_exp_index = 7,
+		.path_id = CLDMA_ID_MD,
+		.ops = &t7xx_trace_port_ops,
+		.name = "mdlog",
+	}, {
+#endif
+		.tx_ch = PORT_CH_CONTROL_TX,
+		.rx_ch = PORT_CH_CONTROL_RX,
+		.txq_index = Q_IDX_CTRL,
+		.rxq_index = Q_IDX_CTRL,
+		.path_id = CLDMA_ID_MD,
+		.ops = &ctl_port_ops,
+		.name = "t7xx_ctrl",
+	},
+};
+
+static struct t7xx_port *t7xx_proxy_get_port_by_ch(struct port_proxy *port_prox, enum port_ch ch)
+{
+	const struct t7xx_port_conf *port_conf;
+	struct t7xx_port *port;
+	int i;
+
+	for_each_proxy_port(i, port, port_prox) {
+		port_conf = port->port_conf;
+		if (port_conf->rx_ch == ch || port_conf->tx_ch == ch)
+			return port;
+	}
+
+	return NULL;
+}
+
+static u16 t7xx_port_next_rx_seq_num(struct t7xx_port *port, struct ccci_header *ccci_h)
+{
+	u32 status = le32_to_cpu(ccci_h->status);
+	u16 seq_num, next_seq_num;
+	bool assert_bit;
+
+	seq_num = FIELD_GET(CCCI_H_SEQ_FLD, status);
+	next_seq_num = (seq_num + 1) & FIELD_MAX(CCCI_H_SEQ_FLD);
+	assert_bit = status & CCCI_H_AST_BIT;
+	if (!assert_bit || port->seq_nums[MTK_RX] == INVALID_SEQ_NUM)
+		return next_seq_num;
+
+	if (seq_num != port->seq_nums[MTK_RX])
+		dev_warn_ratelimited(port->dev,
+				     "seq num out-of-order %u != %u (header %X, len %X)\n",
+				     seq_num, port->seq_nums[MTK_RX],
+				     le32_to_cpu(ccci_h->packet_header),
+				     le32_to_cpu(ccci_h->packet_len));
+
+	return next_seq_num;
+}
+
+void t7xx_port_proxy_reset(struct port_proxy *port_prox)
+{
+	struct t7xx_port *port;
+	int i;
+
+	for_each_proxy_port(i, port, port_prox) {
+		port->seq_nums[MTK_RX] = INVALID_SEQ_NUM;
+		port->seq_nums[MTK_TX] = 0;
+	}
+}
+
+static int t7xx_port_get_queue_no(struct t7xx_port *port)
+{
+	const struct t7xx_port_conf *port_conf = port->port_conf;
+	struct t7xx_fsm_ctl *ctl = port->t7xx_dev->md->fsm_ctl;
+
+	return t7xx_fsm_get_md_state(ctl) == MD_STATE_EXCEPTION ?
+		port_conf->txq_exp_index : port_conf->txq_index;
+}
+
+static void t7xx_port_struct_init(struct t7xx_port *port)
+{
+	INIT_LIST_HEAD(&port->entry);
+	INIT_LIST_HEAD(&port->queue_entry);
+	skb_queue_head_init(&port->rx_skb_list);
+	init_waitqueue_head(&port->rx_wq);
+	port->seq_nums[MTK_RX] = INVALID_SEQ_NUM;
+	port->seq_nums[MTK_TX] = 0;
+	atomic_set(&port->usage_cnt, 0);
+}
+
+struct sk_buff *t7xx_port_alloc_skb(int payload)
+{
+	struct sk_buff *skb = __dev_alloc_skb(payload + sizeof(struct ccci_header), GFP_KERNEL);
+
+	if (skb)
+		skb_reserve(skb, sizeof(struct ccci_header));
+
+	return skb;
+}
+
+struct sk_buff *t7xx_ctrl_alloc_skb(int payload)
+{
+	struct sk_buff *skb = t7xx_port_alloc_skb(payload + sizeof(struct ctrl_msg_header));
+
+	if (skb)
+		skb_reserve(skb, sizeof(struct ctrl_msg_header));
+
+	return skb;
+}
+
+/**
+ * t7xx_port_enqueue_skb() - Enqueue the received skb into the port's rx_skb_list.
+ * @port: port context.
+ * @skb: received skb.
+ *
+ * Return:
+ * * 0		- Success.
+ * * -ENOBUFS	- Not enough buffer space. Caller will try again later, skb is not consumed.
+ */
+int t7xx_port_enqueue_skb(struct t7xx_port *port, struct sk_buff *skb)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->rx_wq.lock, flags);
+	if (port->rx_skb_list.qlen >= port->rx_length_th) {
+		spin_unlock_irqrestore(&port->rx_wq.lock, flags);
+
+		return -ENOBUFS;
+	}
+	__skb_queue_tail(&port->rx_skb_list, skb);
+	spin_unlock_irqrestore(&port->rx_wq.lock, flags);
+
+	wake_up_all(&port->rx_wq);
+	return 0;
+}
+
+static int t7xx_port_send_raw_skb(struct t7xx_port *port, struct sk_buff *skb)
+{
+	enum cldma_id path_id = port->port_conf->path_id;
+	struct cldma_ctrl *md_ctrl;
+	int ret, tx_qno;
+
+	md_ctrl = port->t7xx_dev->md->md_ctrl[path_id];
+	tx_qno = t7xx_port_get_queue_no(port);
+	ret = t7xx_cldma_send_skb(md_ctrl, tx_qno, skb);
+	if (ret)
+		dev_err(port->dev, "Failed to send skb: %d\n", ret);
+
+	return ret;
+}
+
+static int t7xx_port_send_ccci_skb(struct t7xx_port *port, struct sk_buff *skb,
+				   unsigned int pkt_header, unsigned int ex_msg)
+{
+	const struct t7xx_port_conf *port_conf = port->port_conf;
+	struct ccci_header *ccci_h;
+	u32 status;
+	int ret;
+
+	ccci_h = skb_push(skb, sizeof(*ccci_h));
+	status = FIELD_PREP(CCCI_H_CHN_FLD, port_conf->tx_ch) |
+		 FIELD_PREP(CCCI_H_SEQ_FLD, port->seq_nums[MTK_TX]) | CCCI_H_AST_BIT;
+	ccci_h->status = cpu_to_le32(status);
+	ccci_h->packet_header = cpu_to_le32(pkt_header);
+	ccci_h->packet_len = cpu_to_le32(skb->len);
+	ccci_h->ex_msg = cpu_to_le32(ex_msg);
+
+	ret = t7xx_port_send_raw_skb(port, skb);
+	if (ret)
+		return ret;
+
+	port->seq_nums[MTK_TX]++;
+	return 0;
+}
+
+int t7xx_port_send_ctl_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int msg,
+			   unsigned int ex_msg)
+{
+	struct ctrl_msg_header *ctrl_msg_h;
+	unsigned int msg_len = skb->len;
+	u32 pkt_header = 0;
+
+	ctrl_msg_h = skb_push(skb, sizeof(*ctrl_msg_h));
+	ctrl_msg_h->ctrl_msg_id = cpu_to_le32(msg);
+	ctrl_msg_h->ex_msg = cpu_to_le32(ex_msg);
+	ctrl_msg_h->data_length = cpu_to_le32(msg_len);
+
+	if (!msg_len)
+		pkt_header = CCCI_HEADER_NO_DATA;
+
+	return t7xx_port_send_ccci_skb(port, skb, pkt_header, ex_msg);
+}
+
+int t7xx_port_send_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int pkt_header,
+		       unsigned int ex_msg)
+{
+	struct t7xx_fsm_ctl *ctl = port->t7xx_dev->md->fsm_ctl;
+	unsigned int fsm_state;
+
+	fsm_state = t7xx_fsm_get_ctl_state(ctl);
+	if (fsm_state != FSM_STATE_PRE_START) {
+		const struct t7xx_port_conf *port_conf = port->port_conf;
+		enum md_state md_state = t7xx_fsm_get_md_state(ctl);
+
+		switch (md_state) {
+		case MD_STATE_EXCEPTION:
+			if (port_conf->tx_ch != PORT_CH_MD_LOG_TX)
+				return -EBUSY;
+			break;
+
+		case MD_STATE_WAITING_FOR_HS1:
+		case MD_STATE_WAITING_FOR_HS2:
+		case MD_STATE_STOPPED:
+		case MD_STATE_WAITING_TO_STOP:
+		case MD_STATE_INVALID:
+			return -ENODEV;
+
+		default:
+			break;
+		}
+	}
+
+	return t7xx_port_send_ccci_skb(port, skb, pkt_header, ex_msg);
+}
+
+static void t7xx_proxy_setup_ch_mapping(struct port_proxy *port_prox)
+{
+	struct t7xx_port *port;
+
+	int i, j;
+
+	for (i = 0; i < ARRAY_SIZE(port_prox->rx_ch_ports); i++)
+		INIT_LIST_HEAD(&port_prox->rx_ch_ports[i]);
+
+	for (j = 0; j < ARRAY_SIZE(port_prox->queue_ports); j++) {
+		for (i = 0; i < ARRAY_SIZE(port_prox->queue_ports[j]); i++)
+			INIT_LIST_HEAD(&port_prox->queue_ports[j][i]);
+	}
+
+	for_each_proxy_port(i, port, port_prox) {
+		const struct t7xx_port_conf *port_conf = port->port_conf;
+		enum cldma_id path_id = port_conf->path_id;
+		u8 ch_id;
+
+		ch_id = FIELD_GET(PORT_CH_ID_MASK, port_conf->rx_ch);
+		list_add_tail(&port->entry, &port_prox->rx_ch_ports[ch_id]);
+		list_add_tail(&port->queue_entry,
+			      &port_prox->queue_ports[path_id][port_conf->rxq_index]);
+	}
+}
+
+static struct t7xx_port *t7xx_port_proxy_find_port(struct t7xx_pci_dev *t7xx_dev,
+						   struct cldma_queue *queue, u16 channel)
+{
+	struct port_proxy *port_prox = t7xx_dev->md->port_prox;
+	struct list_head *port_list;
+	struct t7xx_port *port;
+	u8 ch_id;
+
+	ch_id = FIELD_GET(PORT_CH_ID_MASK, channel);
+	port_list = &port_prox->rx_ch_ports[ch_id];
+	list_for_each_entry(port, port_list, entry) {
+		const struct t7xx_port_conf *port_conf = port->port_conf;
+
+		if (queue->md_ctrl->hif_id == port_conf->path_id &&
+		    channel == port_conf->rx_ch)
+			return port;
+	}
+
+	return NULL;
+}
+
+/**
+ * t7xx_port_proxy_recv_skb() - Dispatch received skb.
+ * @queue: CLDMA queue.
+ * @skb: Socket buffer.
+ *
+ * Return:
+ ** 0		- Packet consumed.
+ ** -ERROR	- Failed to process skb.
+ */
+static int t7xx_port_proxy_recv_skb(struct cldma_queue *queue, struct sk_buff *skb)
+{
+	struct ccci_header *ccci_h = (struct ccci_header *)skb->data;
+	struct t7xx_pci_dev *t7xx_dev = queue->md_ctrl->t7xx_dev;
+	struct t7xx_fsm_ctl *ctl = t7xx_dev->md->fsm_ctl;
+	struct device *dev = queue->md_ctrl->dev;
+	const struct t7xx_port_conf *port_conf;
+	struct t7xx_port *port;
+	u16 seq_num, channel;
+	int ret;
+
+	channel = FIELD_GET(CCCI_H_CHN_FLD, le32_to_cpu(ccci_h->status));
+	if (t7xx_fsm_get_md_state(ctl) == MD_STATE_INVALID) {
+		dev_err_ratelimited(dev, "Packet drop on channel 0x%x, modem not ready\n", channel);
+		goto drop_skb;
+	}
+
+	port = t7xx_port_proxy_find_port(t7xx_dev, queue, channel);
+	if (!port) {
+		dev_err_ratelimited(dev, "Packet drop on channel 0x%x, port not found\n", channel);
+		goto drop_skb;
+	}
+
+	seq_num = t7xx_port_next_rx_seq_num(port, ccci_h);
+	port_conf = port->port_conf;
+	skb_pull(skb, sizeof(*ccci_h));
+
+	ret = port_conf->ops->recv_skb(port, skb);
+	/* Error indicates to try again later */
+	if (ret) {
+		skb_push(skb, sizeof(*ccci_h));
+		return ret;
+	}
+
+	port->seq_nums[MTK_RX] = seq_num;
+	return 0;
+
+drop_skb:
+	dev_kfree_skb_any(skb);
+	return 0;
+}
+
+/**
+ * t7xx_port_proxy_md_status_notify() - Notify all ports of state.
+ *@port_prox: The port_proxy pointer.
+ *@state: State.
+ *
+ * Called by t7xx_fsm. Used to dispatch modem status for all ports,
+ * which want to know MD state transition.
+ */
+void t7xx_port_proxy_md_status_notify(struct port_proxy *port_prox, unsigned int state)
+{
+	struct t7xx_port *port;
+	int i;
+
+	for_each_proxy_port(i, port, port_prox) {
+		const struct t7xx_port_conf *port_conf = port->port_conf;
+
+		if (port_conf->ops->md_state_notify)
+			port_conf->ops->md_state_notify(port, state);
+	}
+}
+
+static void t7xx_proxy_init_all_ports(struct t7xx_modem *md)
+{
+	struct port_proxy *port_prox = md->port_prox;
+	struct t7xx_port *port;
+	int i;
+
+	for_each_proxy_port(i, port, port_prox) {
+		const struct t7xx_port_conf *port_conf = port->port_conf;
+
+		t7xx_port_struct_init(port);
+
+		if (port_conf->tx_ch == PORT_CH_CONTROL_TX)
+			md->core_md.ctl_port = port;
+
+		port->t7xx_dev = md->t7xx_dev;
+		port->dev = &md->t7xx_dev->pdev->dev;
+		spin_lock_init(&port->port_update_lock);
+		port->chan_enable = false;
+
+		if (port_conf->ops->init)
+			port_conf->ops->init(port);
+	}
+
+	t7xx_proxy_setup_ch_mapping(port_prox);
+}
+
+static int t7xx_proxy_alloc(struct t7xx_modem *md)
+{
+	unsigned int port_count = ARRAY_SIZE(t7xx_md_port_conf);
+	struct device *dev = &md->t7xx_dev->pdev->dev;
+	struct port_proxy *port_prox;
+	int i;
+
+	port_prox = devm_kzalloc(dev, sizeof(*port_prox) + sizeof(struct t7xx_port) * port_count,
+				 GFP_KERNEL);
+	if (!port_prox)
+		return -ENOMEM;
+
+	md->port_prox = port_prox;
+	port_prox->dev = dev;
+
+	for (i = 0; i < port_count; i++)
+		port_prox->ports[i].port_conf = &t7xx_md_port_conf[i];
+
+	port_prox->port_count = port_count;
+	t7xx_proxy_init_all_ports(md);
+	return 0;
+}
+
+/**
+ * t7xx_port_proxy_init() - Initialize ports.
+ * @md: Modem.
+ *
+ * Create all port instances.
+ *
+ * Return:
+ * * 0		- Success.
+ * * -ERROR	- Error code from failure sub-initializations.
+ */
+int t7xx_port_proxy_init(struct t7xx_modem *md)
+{
+	int ret;
+
+	ret = t7xx_proxy_alloc(md);
+	if (ret)
+		return ret;
+
+	t7xx_cldma_set_recv_skb(md->md_ctrl[CLDMA_ID_MD], t7xx_port_proxy_recv_skb);
+	return 0;
+}
+
+void t7xx_port_proxy_uninit(struct port_proxy *port_prox)
+{
+	struct t7xx_port *port;
+	int i;
+
+	for_each_proxy_port(i, port, port_prox) {
+		const struct t7xx_port_conf *port_conf = port->port_conf;
+
+		if (port_conf->ops->uninit)
+			port_conf->ops->uninit(port);
+	}
+}
+
+int t7xx_port_proxy_chl_enable_disable(struct port_proxy *port_prox, unsigned int ch_id,
+				       bool en_flag)
+{
+	struct t7xx_port *port = t7xx_proxy_get_port_by_ch(port_prox, ch_id);
+	const struct t7xx_port_conf *port_conf;
+
+	if (!port)
+		return -EINVAL;
+
+	port_conf = port->port_conf;
+
+	if (en_flag) {
+		if (port_conf->ops->enable_chl)
+			port_conf->ops->enable_chl(port);
+	} else {
+		if (port_conf->ops->disable_chl)
+			port_conf->ops->disable_chl(port);
+	}
+
+	return 0;
+}