424 lines
9.9 KiB
C
424 lines
9.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2021, MediaTek Inc.
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* Copyright (c) 2021-2022, Intel Corporation.
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*
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* Authors:
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* Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
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* Haijun Liu <haijun.liu@mediatek.com>
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* Ricardo Martinez <ricardo.martinez@linux.intel.com>
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*
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* Contributors:
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* Amir Hanania <amir.hanania@intel.com>
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* Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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* Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
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* Eliot Lee <eliot.lee@intel.com>
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* Moises Veleta <moises.veleta@intel.com>
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* Sreehari Kancharla <sreehari.kancharla@intel.com>
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*/
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#include <linux/atomic.h>
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#include <linux/device.h>
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#include <linux/gfp.h>
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#include <linux/if_arp.h>
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#include <linux/if_ether.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/netdev_features.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/types.h>
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#include <linux/wwan.h>
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#include <net/pkt_sched.h>
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#include "t7xx_hif_dpmaif_rx.h"
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#include "t7xx_hif_dpmaif_tx.h"
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#include "t7xx_netdev.h"
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#include "t7xx_pci.h"
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#include "t7xx_port_proxy.h"
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#include "t7xx_state_monitor.h"
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#define IP_MUX_SESSION_DEFAULT 0
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static int t7xx_ccmni_open(struct net_device *dev)
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{
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struct t7xx_ccmni *ccmni = wwan_netdev_drvpriv(dev);
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netif_carrier_on(dev);
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netif_tx_start_all_queues(dev);
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atomic_inc(&ccmni->usage);
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return 0;
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}
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static int t7xx_ccmni_close(struct net_device *dev)
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{
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struct t7xx_ccmni *ccmni = wwan_netdev_drvpriv(dev);
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atomic_dec(&ccmni->usage);
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netif_carrier_off(dev);
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netif_tx_disable(dev);
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return 0;
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}
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static int t7xx_ccmni_send_packet(struct t7xx_ccmni *ccmni, struct sk_buff *skb,
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unsigned int txq_number)
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{
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struct t7xx_ccmni_ctrl *ctlb = ccmni->ctlb;
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struct t7xx_skb_cb *skb_cb = T7XX_SKB_CB(skb);
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skb_cb->netif_idx = ccmni->index;
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if (t7xx_dpmaif_tx_send_skb(ctlb->hif_ctrl, txq_number, skb))
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return NETDEV_TX_BUSY;
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return 0;
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}
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static netdev_tx_t t7xx_ccmni_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct t7xx_ccmni *ccmni = wwan_netdev_drvpriv(dev);
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int skb_len = skb->len;
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/* If MTU is changed or there is no headroom, drop the packet */
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if (skb->len > dev->mtu || skb_headroom(skb) < sizeof(struct ccci_header)) {
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dev_kfree_skb(skb);
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dev->stats.tx_dropped++;
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return NETDEV_TX_OK;
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}
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if (t7xx_ccmni_send_packet(ccmni, skb, DPMAIF_TX_DEFAULT_QUEUE))
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return NETDEV_TX_BUSY;
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb_len;
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return NETDEV_TX_OK;
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}
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static void t7xx_ccmni_tx_timeout(struct net_device *dev, unsigned int __always_unused txqueue)
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{
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struct t7xx_ccmni *ccmni = netdev_priv(dev);
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dev->stats.tx_errors++;
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if (atomic_read(&ccmni->usage) > 0)
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netif_tx_wake_all_queues(dev);
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}
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static const struct net_device_ops ccmni_netdev_ops = {
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.ndo_open = t7xx_ccmni_open,
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.ndo_stop = t7xx_ccmni_close,
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.ndo_start_xmit = t7xx_ccmni_start_xmit,
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.ndo_tx_timeout = t7xx_ccmni_tx_timeout,
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};
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static void t7xx_ccmni_start(struct t7xx_ccmni_ctrl *ctlb)
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{
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struct t7xx_ccmni *ccmni;
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int i;
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for (i = 0; i < ctlb->nic_dev_num; i++) {
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ccmni = ctlb->ccmni_inst[i];
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if (!ccmni)
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continue;
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if (atomic_read(&ccmni->usage) > 0) {
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netif_tx_start_all_queues(ccmni->dev);
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netif_carrier_on(ccmni->dev);
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}
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}
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}
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static void t7xx_ccmni_pre_stop(struct t7xx_ccmni_ctrl *ctlb)
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{
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struct t7xx_ccmni *ccmni;
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int i;
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for (i = 0; i < ctlb->nic_dev_num; i++) {
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ccmni = ctlb->ccmni_inst[i];
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if (!ccmni)
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continue;
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if (atomic_read(&ccmni->usage) > 0)
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netif_tx_disable(ccmni->dev);
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}
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}
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static void t7xx_ccmni_post_stop(struct t7xx_ccmni_ctrl *ctlb)
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{
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struct t7xx_ccmni *ccmni;
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int i;
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for (i = 0; i < ctlb->nic_dev_num; i++) {
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ccmni = ctlb->ccmni_inst[i];
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if (!ccmni)
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continue;
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if (atomic_read(&ccmni->usage) > 0)
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netif_carrier_off(ccmni->dev);
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}
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}
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static void t7xx_ccmni_wwan_setup(struct net_device *dev)
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{
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dev->hard_header_len += sizeof(struct ccci_header);
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dev->mtu = ETH_DATA_LEN;
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dev->max_mtu = CCMNI_MTU_MAX;
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BUILD_BUG_ON(CCMNI_MTU_MAX > DPMAIF_HW_MTU_SIZE);
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dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
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dev->watchdog_timeo = CCMNI_NETDEV_WDT_TO;
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dev->flags = IFF_POINTOPOINT | IFF_NOARP;
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dev->features = NETIF_F_VLAN_CHALLENGED;
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dev->features |= NETIF_F_SG;
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dev->hw_features |= NETIF_F_SG;
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dev->features |= NETIF_F_HW_CSUM;
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dev->hw_features |= NETIF_F_HW_CSUM;
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dev->features |= NETIF_F_RXCSUM;
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dev->hw_features |= NETIF_F_RXCSUM;
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dev->needs_free_netdev = true;
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dev->type = ARPHRD_NONE;
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dev->netdev_ops = &ccmni_netdev_ops;
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}
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static int t7xx_ccmni_wwan_newlink(void *ctxt, struct net_device *dev, u32 if_id,
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struct netlink_ext_ack *extack)
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{
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struct t7xx_ccmni_ctrl *ctlb = ctxt;
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struct t7xx_ccmni *ccmni;
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int ret;
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if (if_id >= ARRAY_SIZE(ctlb->ccmni_inst))
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return -EINVAL;
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ccmni = wwan_netdev_drvpriv(dev);
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ccmni->index = if_id;
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ccmni->ctlb = ctlb;
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ccmni->dev = dev;
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atomic_set(&ccmni->usage, 0);
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ctlb->ccmni_inst[if_id] = ccmni;
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ret = register_netdevice(dev);
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if (ret)
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return ret;
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netif_device_attach(dev);
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return 0;
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}
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static void t7xx_ccmni_wwan_dellink(void *ctxt, struct net_device *dev, struct list_head *head)
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{
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struct t7xx_ccmni *ccmni = wwan_netdev_drvpriv(dev);
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struct t7xx_ccmni_ctrl *ctlb = ctxt;
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u8 if_id = ccmni->index;
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if (if_id >= ARRAY_SIZE(ctlb->ccmni_inst))
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return;
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if (WARN_ON(ctlb->ccmni_inst[if_id] != ccmni))
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return;
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unregister_netdevice(dev);
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}
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static const struct wwan_ops ccmni_wwan_ops = {
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.priv_size = sizeof(struct t7xx_ccmni),
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.setup = t7xx_ccmni_wwan_setup,
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.newlink = t7xx_ccmni_wwan_newlink,
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.dellink = t7xx_ccmni_wwan_dellink,
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};
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static int t7xx_ccmni_register_wwan(struct t7xx_ccmni_ctrl *ctlb)
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{
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struct device *dev = ctlb->hif_ctrl->dev;
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int ret;
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if (ctlb->wwan_is_registered)
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return 0;
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/* WWAN core will create a netdev for the default IP MUX channel */
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ret = wwan_register_ops(dev, &ccmni_wwan_ops, ctlb, IP_MUX_SESSION_DEFAULT);
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if (ret < 0) {
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dev_err(dev, "Unable to register WWAN ops, %d\n", ret);
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return ret;
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}
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ctlb->wwan_is_registered = true;
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return 0;
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}
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static int t7xx_ccmni_md_state_callback(enum md_state state, void *para)
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{
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struct t7xx_ccmni_ctrl *ctlb = para;
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struct device *dev;
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int ret = 0;
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dev = ctlb->hif_ctrl->dev;
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ctlb->md_sta = state;
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switch (state) {
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case MD_STATE_READY:
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ret = t7xx_ccmni_register_wwan(ctlb);
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if (!ret)
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t7xx_ccmni_start(ctlb);
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break;
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case MD_STATE_EXCEPTION:
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case MD_STATE_STOPPED:
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t7xx_ccmni_pre_stop(ctlb);
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ret = t7xx_dpmaif_md_state_callback(ctlb->hif_ctrl, state);
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if (ret < 0)
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dev_err(dev, "DPMAIF md state callback err, state=%d\n", state);
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t7xx_ccmni_post_stop(ctlb);
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break;
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case MD_STATE_WAITING_FOR_HS1:
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case MD_STATE_WAITING_TO_STOP:
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ret = t7xx_dpmaif_md_state_callback(ctlb->hif_ctrl, state);
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if (ret < 0)
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dev_err(dev, "DPMAIF md state callback err, state=%d\n", state);
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break;
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default:
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break;
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}
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return ret;
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}
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static void init_md_status_notifier(struct t7xx_pci_dev *t7xx_dev)
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{
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struct t7xx_ccmni_ctrl *ctlb = t7xx_dev->ccmni_ctlb;
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struct t7xx_fsm_notifier *md_status_notifier;
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md_status_notifier = &ctlb->md_status_notify;
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INIT_LIST_HEAD(&md_status_notifier->entry);
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md_status_notifier->notifier_fn = t7xx_ccmni_md_state_callback;
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md_status_notifier->data = ctlb;
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t7xx_fsm_notifier_register(t7xx_dev->md, md_status_notifier);
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}
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static void t7xx_ccmni_recv_skb(struct t7xx_pci_dev *t7xx_dev, struct sk_buff *skb)
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{
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struct t7xx_skb_cb *skb_cb;
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struct net_device *net_dev;
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struct t7xx_ccmni *ccmni;
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int pkt_type, skb_len;
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u8 netif_id;
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skb_cb = T7XX_SKB_CB(skb);
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netif_id = skb_cb->netif_idx;
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ccmni = t7xx_dev->ccmni_ctlb->ccmni_inst[netif_id];
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if (!ccmni) {
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dev_kfree_skb(skb);
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return;
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}
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net_dev = ccmni->dev;
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skb->dev = net_dev;
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pkt_type = skb_cb->rx_pkt_type;
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if (pkt_type == PKT_TYPE_IP6)
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skb->protocol = htons(ETH_P_IPV6);
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else
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skb->protocol = htons(ETH_P_IP);
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skb_len = skb->len;
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netif_rx(skb);
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net_dev->stats.rx_packets++;
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net_dev->stats.rx_bytes += skb_len;
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}
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static void t7xx_ccmni_queue_tx_irq_notify(struct t7xx_ccmni_ctrl *ctlb, int qno)
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{
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struct t7xx_ccmni *ccmni = ctlb->ccmni_inst[0];
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struct netdev_queue *net_queue;
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if (netif_running(ccmni->dev) && atomic_read(&ccmni->usage) > 0) {
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net_queue = netdev_get_tx_queue(ccmni->dev, qno);
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if (netif_tx_queue_stopped(net_queue))
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netif_tx_wake_queue(net_queue);
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}
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}
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static void t7xx_ccmni_queue_tx_full_notify(struct t7xx_ccmni_ctrl *ctlb, int qno)
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{
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struct t7xx_ccmni *ccmni = ctlb->ccmni_inst[0];
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struct netdev_queue *net_queue;
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if (atomic_read(&ccmni->usage) > 0) {
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netdev_err(ccmni->dev, "TX queue %d is full\n", qno);
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net_queue = netdev_get_tx_queue(ccmni->dev, qno);
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netif_tx_stop_queue(net_queue);
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}
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}
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static void t7xx_ccmni_queue_state_notify(struct t7xx_pci_dev *t7xx_dev,
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enum dpmaif_txq_state state, int qno)
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{
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struct t7xx_ccmni_ctrl *ctlb = t7xx_dev->ccmni_ctlb;
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if (ctlb->md_sta != MD_STATE_READY)
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return;
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if (!ctlb->ccmni_inst[0]) {
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dev_warn(&t7xx_dev->pdev->dev, "No netdev registered yet\n");
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return;
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}
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if (state == DMPAIF_TXQ_STATE_IRQ)
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t7xx_ccmni_queue_tx_irq_notify(ctlb, qno);
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else if (state == DMPAIF_TXQ_STATE_FULL)
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t7xx_ccmni_queue_tx_full_notify(ctlb, qno);
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}
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int t7xx_ccmni_init(struct t7xx_pci_dev *t7xx_dev)
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{
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struct device *dev = &t7xx_dev->pdev->dev;
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struct t7xx_ccmni_ctrl *ctlb;
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ctlb = devm_kzalloc(dev, sizeof(*ctlb), GFP_KERNEL);
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if (!ctlb)
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return -ENOMEM;
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t7xx_dev->ccmni_ctlb = ctlb;
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ctlb->t7xx_dev = t7xx_dev;
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ctlb->callbacks.state_notify = t7xx_ccmni_queue_state_notify;
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ctlb->callbacks.recv_skb = t7xx_ccmni_recv_skb;
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ctlb->nic_dev_num = NIC_DEV_DEFAULT;
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ctlb->hif_ctrl = t7xx_dpmaif_hif_init(t7xx_dev, &ctlb->callbacks);
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if (!ctlb->hif_ctrl)
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return -ENOMEM;
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init_md_status_notifier(t7xx_dev);
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return 0;
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}
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void t7xx_ccmni_exit(struct t7xx_pci_dev *t7xx_dev)
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{
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struct t7xx_ccmni_ctrl *ctlb = t7xx_dev->ccmni_ctlb;
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t7xx_fsm_notifier_unregister(t7xx_dev->md, &ctlb->md_status_notify);
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if (ctlb->wwan_is_registered) {
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wwan_unregister_ops(&t7xx_dev->pdev->dev);
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ctlb->wwan_is_registered = false;
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}
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t7xx_dpmaif_hif_exit(ctlb->hif_ctrl);
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}
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