1) Create net device for data/IP communication.
2) Bind VLAN ID to mux IP session.
3) Implement net device operations.
Signed-off-by: M Chetan Kumar <m.chetan.kumar@xxxxxxxxx>
---
drivers/net/wwan/iosm/iosm_ipc_wwan.c | 674 ++++++++++++++++++++++++++++++++++
drivers/net/wwan/iosm/iosm_ipc_wwan.h | 72 ++++
2 files changed, 746 insertions(+)
create mode 100644 drivers/net/wwan/iosm/iosm_ipc_wwan.c
create mode 100644 drivers/net/wwan/iosm/iosm_ipc_wwan.h
diff --git a/drivers/net/wwan/iosm/iosm_ipc_wwan.c b/drivers/net/wwan/iosm/iosm_ipc_wwan.c
new file mode 100644
index 000000000000..f14a971455bb
--- /dev/null
+++ b/drivers/net/wwan/iosm/iosm_ipc_wwan.c
@@ -0,0 +1,674 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Intel Corporation.
+ */
+
+#include <linux/if_vlan.h>
+
+#include "iosm_ipc_chnl_cfg.h"
+#include "iosm_ipc_imem_ops.h"
+
+/* Minimum number of transmit queues per WWAN root device */
+#define WWAN_MIN_TXQ (1)
+/* Minimum number of receive queues per WWAN root device */
+#define WWAN_MAX_RXQ (1)
+/* Default transmit queue for WWAN root device */
+#define WWAN_DEFAULT_TXQ (0)
+/* VLAN tag for WWAN root device */
+#define WWAN_ROOT_VLAN_TAG (0)
+
+#define IPC_MEM_MIN_MTU_SIZE (68)
+#define IPC_MEM_MAX_MTU_SIZE (1024 * 1024)
+
+#define IPC_MEM_VLAN_TO_SESSION (1)
+
+/* Required alignment for TX in bytes (32 bit/4 bytes)*/
+#define IPC_WWAN_ALIGN (4)
+
+/**
+ * struct ipc_vlan_info - This structure includes information about VLAN device.
+ * @vlan_id: VLAN tag of the VLAN device.
+ * @ch_id: IPC channel number for which VLAN device is created.
+ * @stats: Contains statistics of VLAN devices.
+ */
+struct ipc_vlan_info {
+ int vlan_id;
+ int ch_id;
+ struct net_device_stats stats;
+};
+
+/**
+ * struct iosm_wwan - This structure contains information about WWAN root device
+ * and interface to the IPC layer.
+ * @vlan_devs: Contains information about VLAN devices created under
+ * WWAN root device.
+ * @netdev: Pointer to network interface device structure.
+ * @ops_instance: Instance pointer for Callbacks
+ * @dev: Pointer device structure
+ * @lock: Spinlock to be used for atomic operations of the
+ * root device.
+ * @stats: Contains statistics of WWAN root device
+ * @vlan_devs_nr: Number of VLAN devices.
+ * @if_mutex: Mutex used for add and remove vlan-id
+ * @max_devs: Maximum supported VLAN devs
+ * @max_ip_devs: Maximum supported IP VLAN devs
+ * @is_registered: Registration status with netdev
+ */
+struct iosm_wwan {
+ struct ipc_vlan_info *vlan_devs;
+ struct net_device *netdev;
+ void *ops_instance;
+ struct device *dev;
+ spinlock_t lock; /* Used for atomic operations on root device */
+ struct net_device_stats stats;
+ int vlan_devs_nr;
+ struct mutex if_mutex; /* Mutex used for add and remove vlan-id */
+ int max_devs;
+ int max_ip_devs;
+ u8 is_registered : 1;
+};
+
+/* Get the array index of requested tag. */
+static int ipc_wwan_get_vlan_devs_nr(struct iosm_wwan *ipc_wwan, u16 tag)
+{
+ int i = 0;
+
+ if (!ipc_wwan->vlan_devs)
+ return -EINVAL;
+
+ for (i = 0; i < ipc_wwan->vlan_devs_nr; i++)
+ if (ipc_wwan->vlan_devs[i].vlan_id == tag)
+ return i;
+
+ return -EINVAL;
+}
+
+static int ipc_wwan_add_vlan(struct iosm_wwan *ipc_wwan, u16 vid)
+{
+ if (vid >= 512 || !ipc_wwan->vlan_devs)
+ return -EINVAL;
+
+ if (vid == WWAN_ROOT_VLAN_TAG)
+ return 0;
+
+ mutex_lock(&ipc_wwan->if_mutex);
+
+ /* get channel id */
+ ipc_wwan->vlan_devs[ipc_wwan->vlan_devs_nr].ch_id =
+ imem_sys_wwan_open(ipc_wwan->ops_instance, vid);
+
+ if (ipc_wwan->vlan_devs[ipc_wwan->vlan_devs_nr].ch_id < 0) {
+ dev_err(ipc_wwan->dev,
+ "cannot connect wwan0 & id %d to the IPC mem layer",
+ vid);
+ mutex_unlock(&ipc_wwan->if_mutex);
+ return -ENODEV;
+ }
+
+ /* save vlan id */
+ ipc_wwan->vlan_devs[ipc_wwan->vlan_devs_nr].vlan_id = vid;
+
+ dev_dbg(ipc_wwan->dev, "Channel id %d allocated to vlan id %d",
+ ipc_wwan->vlan_devs[ipc_wwan->vlan_devs_nr].ch_id,
+ ipc_wwan->vlan_devs[ipc_wwan->vlan_devs_nr].vlan_id);
+
+ ipc_wwan->vlan_devs_nr++;
+
+ mutex_unlock(&ipc_wwan->if_mutex);
+
+ return 0;
+}
+
+static int ipc_wwan_remove_vlan(struct iosm_wwan *ipc_wwan, u16 vid)
+{
+ int ch_nr = ipc_wwan_get_vlan_devs_nr(ipc_wwan, vid);
+ int i = 0;
+
+ if (ch_nr < 0) {
+ dev_err(ipc_wwan->dev, "vlan dev not found for vid = %d", vid);
+ return ch_nr;
+ }
+
+ if (ipc_wwan->vlan_devs[ch_nr].ch_id < 0) {
+ dev_err(ipc_wwan->dev, "invalid ch nr %d to kill", ch_nr);
+ return -EINVAL;
+ }
+
+ mutex_lock(&ipc_wwan->if_mutex);
+
+ imem_sys_wwan_close(ipc_wwan->ops_instance, vid,
+ ipc_wwan->vlan_devs[ch_nr].ch_id);
+
+ ipc_wwan->vlan_devs[ch_nr].ch_id = -1;
+
+ /* re-align the vlan information as we removed one tag */
+ for (i = ch_nr; i < ipc_wwan->vlan_devs_nr; i++)
+ memcpy(&ipc_wwan->vlan_devs[i], &ipc_wwan->vlan_devs[i + 1],
+ sizeof(struct ipc_vlan_info));
+
+ ipc_wwan->vlan_devs_nr--;
+
+ mutex_unlock(&ipc_wwan->if_mutex);
+
+ return 0;
+}
+
+/* Checks the protocol and discards the Ethernet header or VLAN header
+ * accordingly.
+ */
+static int ipc_wwan_pull_header(struct sk_buff *skb, bool *is_ip)
+{
+ unsigned int header_size;
+ __be16 proto;
+
+ if (skb->protocol == htons(ETH_P_8021Q)) {
+ proto = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
+
+ if (skb->len < VLAN_ETH_HLEN)
+ header_size = 0;
+ else
+ header_size = VLAN_ETH_HLEN;
+ } else {
+ proto = eth_hdr(skb)->h_proto;
+
+ if (skb->len < ETH_HLEN)
+ header_size = 0;
+ else
+ header_size = ETH_HLEN;
+ }
+
+ /* If a valid pointer */
+ if (header_size > 0 && is_ip) {
+ *is_ip = (proto == htons(ETH_P_IP)) ||
+ (proto == htons(ETH_P_IPV6));
+
+ /* Discard the vlan/ethernet header. */
+ if (unlikely(!skb_pull(skb, header_size)))
+ header_size = 0;
+ }
+
+ return header_size;
+}
+
+/* Get VLAN tag from IPC SESSION ID */
+static inline u16 ipc_wwan_mux_session_to_vlan_tag(int id)
+{
+ return (u16)(id + IPC_MEM_VLAN_TO_SESSION);
+}
+
+/* Get IPC SESSION ID from VLAN tag */
+static inline int ipc_wwan_vlan_to_mux_session_id(u16 tag)
+{
+ return tag - IPC_MEM_VLAN_TO_SESSION;
+}
+
+/* Add new vlan device and open a channel */
+static int ipc_wwan_vlan_rx_add_vid(struct net_device *netdev, __be16 proto,
+ u16 vid)
+{
+ struct iosm_wwan *ipc_wwan = netdev_priv(netdev);
+
+ if (vid != IPC_WWAN_DSS_ID_4)
+ return ipc_wwan_add_vlan(ipc_wwan, vid);
+
+ return 0;
+}
+
+/* Remove vlan device and de-allocate channel */
+static int ipc_wwan_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto,
+ u16 vid)
+{
+ struct iosm_wwan *ipc_wwan = netdev_priv(netdev);
+
+ if (vid == WWAN_ROOT_VLAN_TAG)
+ return 0;
+
+ return ipc_wwan_remove_vlan(ipc_wwan, vid);
+}
+
+static int ipc_wwan_open(struct net_device *netdev)
+{
+ /* Octets in one ethernet addr */
+ if (netdev->addr_len < ETH_ALEN) {
+ pr_err("cannot build the Ethernet address for \"%s\"",
+ netdev->name);
+ return -ENODEV;
+ }
+
+ /* enable tx path, DL data may follow */
+ netif_tx_start_all_queues(netdev);
+
+ return 0;
+}
+
+static int ipc_wwan_stop(struct net_device *netdev)
+{
+ pr_debug("Stop all TX Queues");
+
+ netif_tx_stop_all_queues(netdev);
+ return 0;
+}
+
+int ipc_wwan_receive(struct iosm_wwan *ipc_wwan, struct sk_buff *skb_arg,
+ bool dss)
+{
+ struct sk_buff *skb;
+ struct ethhdr *eth;
+ u16 tag = 0;
+
+ if (unlikely(!ipc_wwan)) {
+ if (skb_arg)
+ dev_kfree_skb(skb_arg);
+ return -EINVAL;
+ }
+
+ skb = skb_arg;
+
+ eth = (struct ethhdr *)skb->data;
+ if (unlikely(!eth)) {
+ dev_err(ipc_wwan->dev, "ethernet header info error");
+ dev_kfree_skb(skb);
+ return -1;
+ }
+
+ /* Build the ethernet header.
+ * for kernel version latest than 3.14.0.
+ */
+ ether_addr_copy(eth->h_dest, ipc_wwan->netdev->dev_addr);
+ ether_addr_copy(eth->h_source, ipc_wwan->netdev->dev_addr);
+ eth->h_source[ETH_ALEN - 1] ^= 0x01; /* src is us xor 1 */
+ /* set the ethernet payload type: ipv4 or ipv6 or Dummy type
+ * for 802.3 frames
+ */
+ eth->h_proto = htons(ETH_P_802_3);
+ if (!dss) {
+ if ((skb->data[ETH_HLEN] & 0xF0) == 0x40)
+ eth->h_proto = htons(ETH_P_IP);
+ else if ((skb->data[ETH_HLEN] & 0xF0) == 0x60)
+ eth->h_proto = htons(ETH_P_IPV6);
+ }
+
+ skb->dev = ipc_wwan->netdev;
+ skb->protocol = eth_type_trans(skb, ipc_wwan->netdev);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ vlan_get_tag(skb, &tag);
+ /* TX stats doesn't include ETH_HLEN.
+ * eth_type_trans() functions pulls the ethernet header.
+ * so skb->len does not have ethernet header in it.
+ */
+ ipc_wwan_update_stats(ipc_wwan, ipc_wwan_vlan_to_mux_session_id(tag),
+ skb->len, false);
+
+ switch (netif_rx_ni(skb)) {
+ case NET_RX_SUCCESS:
+ break;
+ case NET_RX_DROP:
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+/* Align SKB to 32bit, if not already aligned */
+static struct sk_buff *ipc_wwan_skb_align(struct iosm_wwan *ipc_wwan,
+ struct sk_buff *skb)
+{
+ unsigned int offset = (uintptr_t)skb->data & (IPC_WWAN_ALIGN - 1);
+ struct sk_buff *new_skb;
+
+ if (offset == 0)
+ return skb;
+
+ /* Allocate new skb to copy into */
+ new_skb = dev_alloc_skb(skb->len + (IPC_WWAN_ALIGN - 1));
+ if (unlikely(!new_skb)) {
+ dev_err(ipc_wwan->dev, "failed to reallocate skb");
+ goto out;
+ }
+
+ /* Make sure newly allocated skb is aligned */
+ offset = (uintptr_t)new_skb->data & (IPC_WWAN_ALIGN - 1);
+ if (unlikely(offset != 0))
+ skb_reserve(new_skb, IPC_WWAN_ALIGN - offset);
+
+ /* Copy payload */
+ memcpy(new_skb->data, skb->data, skb->len);
+
+ skb_put(new_skb, skb->len);
+out:
+ dev_kfree_skb(skb);
+ return new_skb;
+}
+
+/* Transmit a packet (called by the kernel) */
+static int ipc_wwan_transmit(struct sk_buff *skb, struct net_device *netdev)
+{
+ struct iosm_wwan *ipc_wwan = netdev_priv(netdev);
+ bool is_ip = false;
+ int ret = -EINVAL;
+ int header_size;
+ int idx = 0;
+ u16 tag = 0;
+
+ vlan_get_tag(skb, &tag);
+
+ /* If the SKB is of WWAN root device then don't send it to device.
+ * Free the SKB and then return.
+ */
+ if (unlikely(tag == WWAN_ROOT_VLAN_TAG))
+ goto exit;
+
+ /* Discard the Ethernet header or VLAN Ethernet header depending
+ * on the protocol.
+ */
+ header_size = ipc_wwan_pull_header(skb, &is_ip);
+ if (!header_size)
+ goto exit;
+
+ /* Get the channel number corresponding to VLAN ID */
+ idx = ipc_wwan_get_vlan_devs_nr(ipc_wwan, tag);
+ if (unlikely(idx < 0 || idx >= ipc_wwan->max_devs ||
+ ipc_wwan->vlan_devs[idx].ch_id < 0))
+ goto exit;
+
+ /* VLAN IDs from 1 to 255 are for IP data
+ * 257 to 512 are for non-IP data
+ */
+ if ((tag > 0 && tag < 256)) {
+ if (unlikely(!is_ip)) {
+ ret = -EXDEV;
+ goto exit;
+ }
+ } else if (tag > 256 && tag < 512) {
+ if (unlikely(is_ip)) {
+ ret = -EXDEV;
+ goto exit;
+ }
+
+ /* Align the SKB only for control packets if not aligned. */
+ skb = ipc_wwan_skb_align(ipc_wwan, skb);
+ if (!skb)
+ goto exit;
+ } else {
+ /* Unknown VLAN IDs */
+ ret = -EXDEV;
+ goto exit;
+ }
+
+ /* Send the SKB to device for transmission */
+ ret = imem_sys_wwan_transmit(ipc_wwan->ops_instance, tag,
+ ipc_wwan->vlan_devs[idx].ch_id, skb);
+
+ /* Return code of zero is success */
+ if (ret == 0) {
+ ret = NETDEV_TX_OK;
+ } else if (ret == -2) {
+ /* Return code -2 is to enable re-enqueue of the skb.
+ * Re-push the stripped header before returning busy.
+ */
+ if (unlikely(!skb_push(skb, header_size))) {
+ dev_err(ipc_wwan->dev, "unable to push eth hdr");
+ ret = -EIO;
+ goto exit;
+ }
+
+ ret = NETDEV_TX_BUSY;
+ } else {
+ ret = -EIO;
+ goto exit;
+ }
+
+ return ret;
+
+exit:
+ /* Log any skb drop except for WWAN Root device */
+ if (tag != 0)
+ dev_dbg(ipc_wwan->dev, "skb dropped.VLAN ID: %d, ret: %d", tag,
+ ret);
+
+ dev_kfree_skb_any(skb);
+ return ret;
+}
+
+static int ipc_wwan_change_mtu(struct net_device *dev, int new_mtu)
+{
+ struct iosm_wwan *ipc_wwan = netdev_priv(dev);
+ unsigned long flags = 0;
+
+ if (unlikely(new_mtu < IPC_MEM_MIN_MTU_SIZE ||
+ new_mtu > IPC_MEM_MAX_MTU_SIZE)) {
+ dev_err(ipc_wwan->dev, "mtu %d out of range %d..%d", new_mtu,
+ IPC_MEM_MIN_MTU_SIZE, IPC_MEM_MAX_MTU_SIZE);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&ipc_wwan->lock, flags);
+ dev->mtu = new_mtu;
+ spin_unlock_irqrestore(&ipc_wwan->lock, flags);
+ return 0;
+}
+
+static int ipc_wwan_change_mac_addr(struct net_device *dev, void *sock_addr)
+{
+ struct iosm_wwan *ipc_wwan = netdev_priv(dev);
+ struct sockaddr *addr = sock_addr;
+ unsigned long flags = 0;
+ int result = 0;
+ u8 *sock_data;
+
+ sock_data = (u8 *)addr->sa_data;
+
+ spin_lock_irqsave(&ipc_wwan->lock, flags);
+
+ if (is_zero_ether_addr(sock_data)) {
+ dev->addr_len = 1;
+ memset(dev->dev_addr, 0, 6);
+ dev_dbg(ipc_wwan->dev, "mac addr set to zero");
+ goto exit;
+ }
+
+ result = eth_mac_addr(dev, sock_addr);
+exit:
+ spin_unlock_irqrestore(&ipc_wwan->lock, flags);
+ return result;
+}
+
+static int ipc_wwan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ if (cmd != SIOCSIFHWADDR ||
+ !access_ok((void __user *)ifr, sizeof(struct ifreq)) ||
+ dev->addr_len > sizeof(struct sockaddr))
+ return -EINVAL;
+
+ return ipc_wwan_change_mac_addr(dev, &ifr->ifr_hwaddr);
+}
+
+static struct net_device_stats *ipc_wwan_get_stats(struct net_device *dev)
+{
+ struct iosm_wwan *ipc_wwan = netdev_priv(dev);
+
+ return &ipc_wwan->stats;
+}
+
+/* validate mac address for wwan devices */
+static int ipc_wwan_eth_validate_addr(struct net_device *netdev)
+{
+ return eth_validate_addr(netdev);
+}
+
+/* return valid TX queue for the mapped VLAN device
+ * for kernel version latest than 4.19.0
+ */
+static u16 ipc_wwan_select_queue(struct net_device *netdev, struct sk_buff *skb,
+ struct net_device *sb_dev)
+{
+ struct iosm_wwan *ipc_wwan = netdev_priv(netdev);
+ u16 txqn = 0xFFFF;
+ u16 tag = 0;
+
+ /* get VLAN tag for the current skb
+ * if the packet is untagged, return the default queue.
+ */
+ if (vlan_get_tag(skb, &tag) < 0)
+ return WWAN_DEFAULT_TXQ;
+
+ /* TX Queues are allocated as following:
+ *
+ * if vlan ID == 0 is used for VLAN root device i.e. WWAN0.
+ * Assign default TX Queue which is 0.
+ *
+ * if vlan ID >= IMEM_WWAN_CTRL_VLAN_ID_START
+ * && <= IMEM_WWAN_CTRL_VLAN_ID_END then we use default
+ * TX Queue which is 0.
+ *
+ * if vlan ID >= IMEM_WWAN_DATA_VLAN_ID_START
+ * && <= Max IP devices then allocate separate
+ * TX Queue to each VLAN ID.
+ *
+ * For any other vlan ID return invalid Tx Queue
+ */
+ if (tag >= IMEM_WWAN_DATA_VLAN_ID_START && tag <= ipc_wwan->max_ip_devs)
+ txqn = tag;
+ else if ((tag >= IMEM_WWAN_CTRL_VLAN_ID_START &&
+ tag <= IMEM_WWAN_CTRL_VLAN_ID_END) ||
+ tag == WWAN_ROOT_VLAN_TAG)
+ txqn = WWAN_DEFAULT_TXQ;
+
+ dev_dbg(ipc_wwan->dev, "VLAN tag = %u, TX Queue selected %u", tag,
+ txqn);
+ return txqn;
+}
+
+static const struct net_device_ops ipc_wwandev_ops = {
+ .ndo_open = ipc_wwan_open,
+ .ndo_stop = ipc_wwan_stop,
+ .ndo_start_xmit = ipc_wwan_transmit,
+ .ndo_change_mtu = ipc_wwan_change_mtu,
+ .ndo_validate_addr = ipc_wwan_eth_validate_addr,
+ .ndo_do_ioctl = ipc_wwan_ioctl,
+ .ndo_get_stats = ipc_wwan_get_stats,
+ .ndo_vlan_rx_add_vid = ipc_wwan_vlan_rx_add_vid,
+ .ndo_vlan_rx_kill_vid = ipc_wwan_vlan_rx_kill_vid,
+ .ndo_set_mac_address = ipc_wwan_change_mac_addr,
+ .ndo_select_queue = ipc_wwan_select_queue,
+};
+
+void ipc_wwan_update_stats(struct iosm_wwan *ipc_wwan, int id, size_t len,
+ bool tx)
+{
+ int idx =
+ ipc_wwan_get_vlan_devs_nr(ipc_wwan,
+ ipc_wwan_mux_session_to_vlan_tag(id));
+
+ if (unlikely(idx < 0 || idx >= ipc_wwan->max_devs)) {
+ dev_err(ipc_wwan->dev, "invalid VLAN device");
+ return;
+ }
+
+ if (tx) {
+ /* Update vlan device tx statistics */
+ ipc_wwan->vlan_devs[idx].stats.tx_packets++;
+ ipc_wwan->vlan_devs[idx].stats.tx_bytes += len;
+ /* Update root device tx statistics */
+ ipc_wwan->stats.tx_packets++;
+ ipc_wwan->stats.tx_bytes += len;
+ } else {
+ /* Update vlan device rx statistics */
+ ipc_wwan->vlan_devs[idx].stats.rx_packets++;
+ ipc_wwan->vlan_devs[idx].stats.rx_bytes += len;
+ /* Update root device rx statistics */
+ ipc_wwan->stats.rx_packets++;
+ ipc_wwan->stats.rx_bytes += len;
+ }
+}
+
+void ipc_wwan_tx_flowctrl(struct iosm_wwan *ipc_wwan, int id, bool on)
+{
+ u16 vid = ipc_wwan_mux_session_to_vlan_tag(id);
+
+ dev_dbg(ipc_wwan->dev, "MUX session id[%d]: %s", id,
+ on ? "Enable" : "Disable");
+ if (on)
+ netif_stop_subqueue(ipc_wwan->netdev, vid);
+ else
+ netif_wake_subqueue(ipc_wwan->netdev, vid);
+}
+
+static struct device_type wwan_type = { .name = "wwan" };
+
+struct iosm_wwan *ipc_wwan_init(void *ops_instance, struct device *dev,
+ int max_sessions)
+{
+ int max_tx_q = WWAN_MIN_TXQ + max_sessions;
+ struct iosm_wwan *ipc_wwan;
+ struct net_device *netdev;
+
+ /* allocate ethernet device */
+ netdev = alloc_etherdev_mqs(sizeof(*ipc_wwan), max_tx_q, WWAN_MAX_RXQ);
+
+ if (unlikely(!netdev || !ops_instance))
+ return NULL;
+
+ ipc_wwan = netdev_priv(netdev);
+
+ ipc_wwan->dev = dev;
+ ipc_wwan->netdev = netdev;
+ ipc_wwan->is_registered = false;
+
+ ipc_wwan->vlan_devs_nr = 0;
+ ipc_wwan->ops_instance = ops_instance;
+
+ ipc_wwan->max_devs = max_sessions + IPC_MEM_MAX_CHANNELS;
+ ipc_wwan->max_ip_devs = max_sessions;
+
+ ipc_wwan->vlan_devs = kcalloc(ipc_wwan->max_devs,
+ sizeof(ipc_wwan->vlan_devs[0]),
+ GFP_KERNEL);
+
+ spin_lock_init(&ipc_wwan->lock);
+ mutex_init(&ipc_wwan->if_mutex);
+
+ /* allocate random ethernet address */
+ eth_random_addr(netdev->dev_addr);
+ netdev->addr_assign_type = NET_ADDR_RANDOM;
+
+ snprintf(netdev->name, IFNAMSIZ, "%s", "wwan0");
+ netdev->netdev_ops = &ipc_wwandev_ops;
+ netdev->flags |= IFF_NOARP;
+ netdev->features |=
+ NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_FILTER;
+ SET_NETDEV_DEVTYPE(netdev, &wwan_type);
+
+ if (register_netdev(netdev)) {
+ dev_err(ipc_wwan->dev, "register_netdev failed");
+ ipc_wwan_deinit(ipc_wwan);
+ return NULL;
+ }
+
+ ipc_wwan->is_registered = true;
+
+ netif_device_attach(netdev);
+
+ /* Set Max MTU for kernel version latest than 4.10.0. */
+ netdev->max_mtu = IPC_MEM_MAX_MTU_SIZE;
+
+ return ipc_wwan;
+}
+
+void ipc_wwan_deinit(struct iosm_wwan *ipc_wwan)
+{
+ if (ipc_wwan->is_registered)
+ unregister_netdev(ipc_wwan->netdev);
+ kfree(ipc_wwan->vlan_devs);
+ ipc_wwan->vlan_devs = NULL;
+ free_netdev(ipc_wwan->netdev);
+}
+
+bool ipc_wwan_is_tx_stopped(struct iosm_wwan *ipc_wwan, int id)
+{
+ u16 vid = ipc_wwan_mux_session_to_vlan_tag(id);
+
+ return __netif_subqueue_stopped(ipc_wwan->netdev, vid);
+}
diff --git a/drivers/net/wwan/iosm/iosm_ipc_wwan.h b/drivers/net/wwan/iosm/iosm_ipc_wwan.h
new file mode 100644
index 000000000000..3c3b1fb31ae1
--- /dev/null
+++ b/drivers/net/wwan/iosm/iosm_ipc_wwan.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (C) 2020 Intel Corporation.
+ */
+
+#ifndef IOSM_IPC_WWAN_H
+#define IOSM_IPC_WWAN_H
+
+#define IMEM_WWAN_DATA_VLAN_ID_START 1
+#define IMEM_WWAN_CTRL_VLAN_ID_START 257
+#define IMEM_WWAN_CTRL_VLAN_ID_END 512
+
+/**
+ * ipc_wwan_init - Allocate, Init and register WWAN device
+ * @ops_instance: Instance pointer for callback
+ * @dev: Pointer to device structure
+ * @max_sessions: Maximum number of sessions
+ *
+ * Returns: Pointer to instance on success else NULL
+ */
+struct iosm_wwan *ipc_wwan_init(void *ops_instance, struct device *dev,
+ int max_sessions);
+
+/**
+ * ipc_wwan_deinit - Unregister and free WWAN device, clear pointer
+ * @ipc_wwan: Pointer to wwan instance data
+ */
+void ipc_wwan_deinit(struct iosm_wwan *ipc_wwan);
+
+/**
+ * ipc_wwan_receive - Receive a downlink packet from CP.
+ * @ipc_wwan: Pointer to wwan instance
+ * @skb_arg: Pointer to struct sk_buff
+ * @dss: Set to true if vlan id is greater than
+ * IMEM_WWAN_CTRL_VLAN_ID_START else false
+ *
+ * Return: 0 on success else error code
+ */
+int ipc_wwan_receive(struct iosm_wwan *ipc_wwan, struct sk_buff *skb_arg,
+ bool dss);
+
+/**
+ * ipc_wwan_update_stats - Update device statistics
+ * @ipc_wwan: Pointer to wwan instance
+ * @id: Ipc mux channel session id
+ * @len: Number of bytes to update
+ * @tx: True if statistics needs to be updated for transmit
+ * else false
+ *
+ */
+void ipc_wwan_update_stats(struct iosm_wwan *ipc_wwan, int id, size_t len,
+ bool tx);
+
+/**
+ * ipc_wwan_tx_flowctrl - Enable/Disable TX flow control
+ * @ipc_wwan: Pointer to wwan instance
+ * @id: Ipc mux channel session id
+ * @on: if true then flow ctrl would be enabled else disable
+ *
+ */
+void ipc_wwan_tx_flowctrl(struct iosm_wwan *ipc_wwan, int id, bool on);
+
+/**
+ * ipc_wwan_is_tx_stopped - Checks if Tx stopped for a VLAN id.
+ * @ipc_wwan: Pointer to wwan instance
+ * @id: Ipc mux channel session id
+ *
+ * Return: true if stopped, false otherwise
+ */
+bool ipc_wwan_is_tx_stopped(struct iosm_wwan *ipc_wwan, int id);
+
+#endif
--
2.12.3
