319 lines
7.4 KiB
C
319 lines
7.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2020-21 Intel Corporation.
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*/
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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#include <linux/if_link.h>
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#include <linux/rtnetlink.h>
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#include <linux/wwan.h>
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#include <net/pkt_sched.h>
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#include "iosm_ipc_chnl_cfg.h"
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#include "iosm_ipc_imem_ops.h"
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#include "iosm_ipc_wwan.h"
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#define IOSM_IP_TYPE_MASK 0xF0
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#define IOSM_IP_TYPE_IPV4 0x40
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#define IOSM_IP_TYPE_IPV6 0x60
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#define IOSM_IF_ID_PAYLOAD 2
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/**
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* struct iosm_netdev_priv - netdev WWAN driver specific private data
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* @ipc_wwan: Pointer to iosm_wwan struct
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* @netdev: Pointer to network interface device structure
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* @if_id: Interface id for device.
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* @ch_id: IPC channel number for which interface device is created.
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*/
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struct iosm_netdev_priv {
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struct iosm_wwan *ipc_wwan;
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struct net_device *netdev;
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int if_id;
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int ch_id;
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};
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/**
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* struct iosm_wwan - This structure contains information about WWAN root device
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* and interface to the IPC layer.
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* @ipc_imem: Pointer to imem data-struct
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* @sub_netlist: List of active netdevs
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* @dev: Pointer device structure
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*/
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struct iosm_wwan {
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struct iosm_imem *ipc_imem;
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struct iosm_netdev_priv __rcu *sub_netlist[IP_MUX_SESSION_END + 1];
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struct device *dev;
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};
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/* Bring-up the wwan net link */
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static int ipc_wwan_link_open(struct net_device *netdev)
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{
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struct iosm_netdev_priv *priv = wwan_netdev_drvpriv(netdev);
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struct iosm_wwan *ipc_wwan = priv->ipc_wwan;
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int if_id = priv->if_id;
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if (if_id < IP_MUX_SESSION_START ||
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if_id >= ARRAY_SIZE(ipc_wwan->sub_netlist))
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return -EINVAL;
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/* get channel id */
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priv->ch_id = ipc_imem_sys_wwan_open(ipc_wwan->ipc_imem, if_id);
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if (priv->ch_id < 0) {
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dev_err(ipc_wwan->dev,
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"cannot connect wwan0 & id %d to the IPC mem layer",
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if_id);
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return -ENODEV;
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}
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/* enable tx path, DL data may follow */
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netif_start_queue(netdev);
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dev_dbg(ipc_wwan->dev, "Channel id %d allocated to if_id %d",
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priv->ch_id, priv->if_id);
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return 0;
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}
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/* Bring-down the wwan net link */
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static int ipc_wwan_link_stop(struct net_device *netdev)
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{
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struct iosm_netdev_priv *priv = wwan_netdev_drvpriv(netdev);
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netif_stop_queue(netdev);
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ipc_imem_sys_wwan_close(priv->ipc_wwan->ipc_imem, priv->if_id,
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priv->ch_id);
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priv->ch_id = -1;
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return 0;
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}
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/* Transmit a packet */
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static netdev_tx_t ipc_wwan_link_transmit(struct sk_buff *skb,
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struct net_device *netdev)
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{
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struct iosm_netdev_priv *priv = wwan_netdev_drvpriv(netdev);
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struct iosm_wwan *ipc_wwan = priv->ipc_wwan;
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unsigned int len = skb->len;
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int if_id = priv->if_id;
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int ret;
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/* Interface IDs from 1 to 8 are for IP data
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* & from 257 to 261 are for non-IP data
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*/
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if (if_id < IP_MUX_SESSION_START ||
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if_id >= ARRAY_SIZE(ipc_wwan->sub_netlist))
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return -EINVAL;
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/* Send the SKB to device for transmission */
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ret = ipc_imem_sys_wwan_transmit(ipc_wwan->ipc_imem,
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if_id, priv->ch_id, skb);
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/* Return code of zero is success */
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if (ret == 0) {
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netdev->stats.tx_packets++;
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netdev->stats.tx_bytes += len;
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ret = NETDEV_TX_OK;
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} else if (ret == -EBUSY) {
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ret = NETDEV_TX_BUSY;
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dev_err(ipc_wwan->dev, "unable to push packets");
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} else {
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goto exit;
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}
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return ret;
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exit:
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/* Log any skb drop */
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if (if_id)
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dev_dbg(ipc_wwan->dev, "skb dropped. IF_ID: %d, ret: %d", if_id,
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ret);
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dev_kfree_skb_any(skb);
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netdev->stats.tx_dropped++;
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return NETDEV_TX_OK;
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}
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/* Ops structure for wwan net link */
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static const struct net_device_ops ipc_inm_ops = {
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.ndo_open = ipc_wwan_link_open,
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.ndo_stop = ipc_wwan_link_stop,
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.ndo_start_xmit = ipc_wwan_link_transmit,
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};
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/* Setup function for creating new net link */
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static void ipc_wwan_setup(struct net_device *iosm_dev)
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{
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iosm_dev->header_ops = NULL;
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iosm_dev->hard_header_len = 0;
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iosm_dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
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iosm_dev->type = ARPHRD_NONE;
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iosm_dev->mtu = ETH_DATA_LEN;
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iosm_dev->min_mtu = ETH_MIN_MTU;
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iosm_dev->max_mtu = ETH_MAX_MTU;
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iosm_dev->flags = IFF_POINTOPOINT | IFF_NOARP;
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iosm_dev->needs_free_netdev = true;
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iosm_dev->netdev_ops = &ipc_inm_ops;
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}
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/* Create new wwan net link */
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static int ipc_wwan_newlink(void *ctxt, struct net_device *dev,
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u32 if_id, struct netlink_ext_ack *extack)
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{
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struct iosm_wwan *ipc_wwan = ctxt;
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struct iosm_netdev_priv *priv;
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int err;
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if (if_id < IP_MUX_SESSION_START ||
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if_id >= ARRAY_SIZE(ipc_wwan->sub_netlist))
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return -EINVAL;
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priv = wwan_netdev_drvpriv(dev);
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priv->if_id = if_id;
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priv->netdev = dev;
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priv->ipc_wwan = ipc_wwan;
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if (rcu_access_pointer(ipc_wwan->sub_netlist[if_id]))
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return -EBUSY;
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err = register_netdevice(dev);
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if (err)
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return err;
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rcu_assign_pointer(ipc_wwan->sub_netlist[if_id], priv);
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netif_device_attach(dev);
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return 0;
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}
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static void ipc_wwan_dellink(void *ctxt, struct net_device *dev,
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struct list_head *head)
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{
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struct iosm_netdev_priv *priv = wwan_netdev_drvpriv(dev);
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struct iosm_wwan *ipc_wwan = ctxt;
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int if_id = priv->if_id;
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if (WARN_ON(if_id < IP_MUX_SESSION_START ||
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if_id >= ARRAY_SIZE(ipc_wwan->sub_netlist)))
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return;
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if (WARN_ON(rcu_access_pointer(ipc_wwan->sub_netlist[if_id]) != priv))
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return;
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RCU_INIT_POINTER(ipc_wwan->sub_netlist[if_id], NULL);
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/* unregistering includes synchronize_net() */
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unregister_netdevice_queue(dev, head);
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}
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static const struct wwan_ops iosm_wwan_ops = {
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.priv_size = sizeof(struct iosm_netdev_priv),
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.setup = ipc_wwan_setup,
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.newlink = ipc_wwan_newlink,
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.dellink = ipc_wwan_dellink,
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};
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int ipc_wwan_receive(struct iosm_wwan *ipc_wwan, struct sk_buff *skb_arg,
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bool dss, int if_id)
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{
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struct sk_buff *skb = skb_arg;
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struct net_device_stats *stats;
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struct iosm_netdev_priv *priv;
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int ret;
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if ((skb->data[0] & IOSM_IP_TYPE_MASK) == IOSM_IP_TYPE_IPV4)
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skb->protocol = htons(ETH_P_IP);
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else if ((skb->data[0] & IOSM_IP_TYPE_MASK) ==
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IOSM_IP_TYPE_IPV6)
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skb->protocol = htons(ETH_P_IPV6);
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skb->pkt_type = PACKET_HOST;
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if (if_id < IP_MUX_SESSION_START ||
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if_id > IP_MUX_SESSION_END) {
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ret = -EINVAL;
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goto free;
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}
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rcu_read_lock();
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priv = rcu_dereference(ipc_wwan->sub_netlist[if_id]);
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if (!priv) {
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ret = -EINVAL;
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goto unlock;
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}
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skb->dev = priv->netdev;
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stats = &priv->netdev->stats;
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stats->rx_packets++;
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stats->rx_bytes += skb->len;
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ret = netif_rx(skb);
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skb = NULL;
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unlock:
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rcu_read_unlock();
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free:
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dev_kfree_skb(skb);
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return ret;
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}
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void ipc_wwan_tx_flowctrl(struct iosm_wwan *ipc_wwan, int if_id, bool on)
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{
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struct net_device *netdev;
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struct iosm_netdev_priv *priv;
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bool is_tx_blk;
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rcu_read_lock();
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priv = rcu_dereference(ipc_wwan->sub_netlist[if_id]);
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if (!priv) {
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rcu_read_unlock();
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return;
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}
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netdev = priv->netdev;
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is_tx_blk = netif_queue_stopped(netdev);
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if (on)
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dev_dbg(ipc_wwan->dev, "session id[%d]: flowctrl enable",
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if_id);
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if (on && !is_tx_blk)
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netif_stop_queue(netdev);
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else if (!on && is_tx_blk)
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netif_wake_queue(netdev);
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rcu_read_unlock();
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}
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struct iosm_wwan *ipc_wwan_init(struct iosm_imem *ipc_imem, struct device *dev)
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{
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struct iosm_wwan *ipc_wwan;
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ipc_wwan = kzalloc(sizeof(*ipc_wwan), GFP_KERNEL);
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if (!ipc_wwan)
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return NULL;
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ipc_wwan->dev = dev;
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ipc_wwan->ipc_imem = ipc_imem;
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/* WWAN core will create a netdev for the default IP MUX channel */
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if (wwan_register_ops(ipc_wwan->dev, &iosm_wwan_ops, ipc_wwan,
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IP_MUX_SESSION_DEFAULT)) {
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kfree(ipc_wwan);
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return NULL;
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}
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return ipc_wwan;
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}
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void ipc_wwan_deinit(struct iosm_wwan *ipc_wwan)
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{
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/* This call will remove all child netdev(s) */
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wwan_unregister_ops(ipc_wwan->dev);
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kfree(ipc_wwan);
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}
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