forked from Minki/linux
net: iosm: net driver
1) Create net device & implement net operations for data/IP communication. 2) Bind IP Link to mux IP session for simultaneous IP traffic. Signed-off-by: M Chetan Kumar <m.chetan.kumar@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
M Chetan Kumar
David S. Miller
parent
110e6e02eb
commit
2a54f2c779
351
drivers/net/wwan/iosm/iosm_ipc_wwan.c
Normal file
351
drivers/net/wwan/iosm/iosm_ipc_wwan.c
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@ -0,0 +1,351 @@
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// 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 "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 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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* @if_mutex: Mutex used for add and remove interface id
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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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struct mutex if_mutex; /* Mutex used for add and remove interface id */
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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 = netdev_priv(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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int ret;
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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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mutex_lock(&ipc_wwan->if_mutex);
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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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ret = -ENODEV;
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goto out;
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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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ret = 0;
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out:
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mutex_unlock(&ipc_wwan->if_mutex);
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return ret;
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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 = netdev_priv(netdev);
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netif_stop_queue(netdev);
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mutex_lock(&priv->ipc_wwan->if_mutex);
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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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mutex_unlock(&priv->ipc_wwan->if_mutex);
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return 0;
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}
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/* Transmit a packet */
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static int 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 = netdev_priv(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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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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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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return ret;
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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->priv_flags |= IFF_NO_QUEUE;
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iosm_dev->type = ARPHRD_NONE;
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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->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 = netdev_priv(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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mutex_lock(&ipc_wwan->if_mutex);
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if (rcu_access_pointer(ipc_wwan->sub_netlist[if_id])) {
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err = -EBUSY;
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goto out_unlock;
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}
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err = register_netdevice(dev);
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if (err)
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goto out_unlock;
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rcu_assign_pointer(ipc_wwan->sub_netlist[if_id], priv);
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mutex_unlock(&ipc_wwan->if_mutex);
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netif_device_attach(dev);
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return 0;
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out_unlock:
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mutex_unlock(&ipc_wwan->if_mutex);
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return err;
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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_wwan *ipc_wwan = ctxt;
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struct iosm_netdev_priv *priv = netdev_priv(dev);
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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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mutex_lock(&ipc_wwan->if_mutex);
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if (WARN_ON(rcu_access_pointer(ipc_wwan->sub_netlist[if_id]) != priv))
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goto unlock;
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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(dev);
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unlock:
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mutex_unlock(&ipc_wwan->if_mutex);
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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 - 1) ||
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if_id > (IP_MUX_SESSION_END - 1)) {
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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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if (wwan_register_ops(ipc_wwan->dev, &iosm_wwan_ops, ipc_wwan)) {
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kfree(ipc_wwan);
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return NULL;
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}
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mutex_init(&ipc_wwan->if_mutex);
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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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int if_id;
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wwan_unregister_ops(ipc_wwan->dev);
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for (if_id = 0; if_id < ARRAY_SIZE(ipc_wwan->sub_netlist); if_id++) {
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struct iosm_netdev_priv *priv;
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priv = rcu_access_pointer(ipc_wwan->sub_netlist[if_id]);
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if (!priv)
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continue;
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rtnl_lock();
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ipc_wwan_dellink(ipc_wwan, priv->netdev, NULL);
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rtnl_unlock();
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}
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mutex_destroy(&ipc_wwan->if_mutex);
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kfree(ipc_wwan);
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}
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55
drivers/net/wwan/iosm/iosm_ipc_wwan.h
Normal file
55
drivers/net/wwan/iosm/iosm_ipc_wwan.h
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@ -0,0 +1,55 @@
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/* 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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#ifndef IOSM_IPC_WWAN_H
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#define IOSM_IPC_WWAN_H
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/**
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* ipc_wwan_init - Allocate, Init and register WWAN device
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* @ipc_imem: Pointer to imem data-struct
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* @dev: Pointer to device structure
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*
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* Returns: Pointer to instance on success else NULL
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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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* ipc_wwan_deinit - Unregister and free WWAN device, clear pointer
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* @ipc_wwan: Pointer to wwan instance data
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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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* ipc_wwan_receive - Receive a downlink packet from CP.
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* @ipc_wwan: Pointer to wwan instance
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* @skb_arg: Pointer to struct sk_buff
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* @dss: Set to true if interafce id is from 257 to 261,
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* else false
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* @if_id: Interface ID
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*
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* Return: 0 on success and failure value on error
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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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* ipc_wwan_tx_flowctrl - Enable/Disable TX flow control
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* @ipc_wwan: Pointer to wwan instance
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* @id: Ipc mux channel session id
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* @on: if true then flow ctrl would be enabled else disable
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*
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*/
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void ipc_wwan_tx_flowctrl(struct iosm_wwan *ipc_wwan, int id, bool on);
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/**
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* ipc_wwan_is_tx_stopped - Checks if Tx stopped for a Interface id.
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* @ipc_wwan: Pointer to wwan instance
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* @id: Ipc mux channel session id
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*
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* Return: true if stopped, false otherwise
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*/
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bool ipc_wwan_is_tx_stopped(struct iosm_wwan *ipc_wwan, int id);
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#endif
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