1 // SPDX-License-Identifier: GPL-2.0+ 2 // Copyright (c) 2024 Hisilicon Limited. 3 4 #include <linux/etherdevice.h> 5 #include <linux/netdevice.h> 6 #include <linux/phy.h> 7 #include <linux/rtnetlink.h> 8 #include "hbg_common.h" 9 #include "hbg_err.h" 10 #include "hbg_hw.h" 11 12 static void hbg_restore_mac_table(struct hbg_priv *priv) 13 { 14 struct hbg_mac_filter *filter = &priv->filter; 15 u64 addr; 16 u32 i; 17 18 for (i = 0; i < filter->table_max_len; i++) 19 if (!is_zero_ether_addr(filter->mac_table[i].addr)) { 20 addr = ether_addr_to_u64(filter->mac_table[i].addr); 21 hbg_hw_set_uc_addr(priv, addr, i); 22 } 23 24 hbg_hw_set_mac_filter_enable(priv, priv->filter.enabled); 25 } 26 27 static void hbg_restore_user_def_settings(struct hbg_priv *priv) 28 { 29 /* The index of host mac is always 0. */ 30 u64 rx_pause_addr = ether_addr_to_u64(priv->filter.mac_table[0].addr); 31 struct ethtool_pauseparam *pause_param = &priv->user_def.pause_param; 32 33 hbg_restore_mac_table(priv); 34 hbg_hw_set_mtu(priv, priv->netdev->mtu); 35 hbg_hw_set_pause_enable(priv, pause_param->tx_pause, 36 pause_param->rx_pause); 37 hbg_hw_set_rx_pause_mac_addr(priv, rx_pause_addr); 38 } 39 40 int hbg_rebuild(struct hbg_priv *priv) 41 { 42 int ret; 43 44 ret = hbg_hw_init(priv); 45 if (ret) 46 return ret; 47 48 hbg_restore_user_def_settings(priv); 49 return 0; 50 } 51 52 static int hbg_reset_prepare(struct hbg_priv *priv, enum hbg_reset_type type) 53 { 54 int ret; 55 56 ASSERT_RTNL(); 57 58 if (netif_running(priv->netdev)) { 59 dev_warn(&priv->pdev->dev, 60 "failed to reset because port is up\n"); 61 return -EBUSY; 62 } 63 64 netif_device_detach(priv->netdev); 65 66 priv->reset_type = type; 67 set_bit(HBG_NIC_STATE_RESETTING, &priv->state); 68 clear_bit(HBG_NIC_STATE_RESET_FAIL, &priv->state); 69 ret = hbg_hw_event_notify(priv, HBG_HW_EVENT_RESET); 70 if (ret) { 71 priv->stats.reset_fail_cnt++; 72 set_bit(HBG_NIC_STATE_RESET_FAIL, &priv->state); 73 clear_bit(HBG_NIC_STATE_RESETTING, &priv->state); 74 } 75 76 return ret; 77 } 78 79 static int hbg_reset_done(struct hbg_priv *priv, enum hbg_reset_type type) 80 { 81 int ret; 82 83 if (!test_bit(HBG_NIC_STATE_RESETTING, &priv->state) || 84 type != priv->reset_type) 85 return 0; 86 87 ASSERT_RTNL(); 88 89 clear_bit(HBG_NIC_STATE_RESETTING, &priv->state); 90 ret = hbg_rebuild(priv); 91 if (ret) { 92 priv->stats.reset_fail_cnt++; 93 set_bit(HBG_NIC_STATE_RESET_FAIL, &priv->state); 94 dev_err(&priv->pdev->dev, "failed to rebuild after reset\n"); 95 return ret; 96 } 97 98 netif_device_attach(priv->netdev); 99 100 dev_info(&priv->pdev->dev, "reset done\n"); 101 return ret; 102 } 103 104 /* must be protected by rtnl lock */ 105 int hbg_reset(struct hbg_priv *priv) 106 { 107 int ret; 108 109 ASSERT_RTNL(); 110 ret = hbg_reset_prepare(priv, HBG_RESET_TYPE_FUNCTION); 111 if (ret) 112 return ret; 113 114 return hbg_reset_done(priv, HBG_RESET_TYPE_FUNCTION); 115 } 116 117 void hbg_err_reset(struct hbg_priv *priv) 118 { 119 bool running; 120 121 rtnl_lock(); 122 running = netif_running(priv->netdev); 123 if (running) 124 dev_close(priv->netdev); 125 126 if (hbg_reset(priv)) 127 goto err_unlock; 128 129 if (running) 130 dev_open(priv->netdev, NULL); 131 132 err_unlock: 133 rtnl_unlock(); 134 } 135 136 static pci_ers_result_t hbg_pci_err_detected(struct pci_dev *pdev, 137 pci_channel_state_t state) 138 { 139 struct net_device *netdev = pci_get_drvdata(pdev); 140 141 netif_device_detach(netdev); 142 143 if (state == pci_channel_io_perm_failure) 144 return PCI_ERS_RESULT_DISCONNECT; 145 146 pci_disable_device(pdev); 147 return PCI_ERS_RESULT_NEED_RESET; 148 } 149 150 static pci_ers_result_t hbg_pci_err_slot_reset(struct pci_dev *pdev) 151 { 152 struct net_device *netdev = pci_get_drvdata(pdev); 153 struct hbg_priv *priv = netdev_priv(netdev); 154 155 if (pci_enable_device(pdev)) { 156 dev_err(&pdev->dev, 157 "failed to re-enable PCI device after reset\n"); 158 return PCI_ERS_RESULT_DISCONNECT; 159 } 160 161 pci_set_master(pdev); 162 pci_restore_state(pdev); 163 pci_save_state(pdev); 164 165 hbg_err_reset(priv); 166 return PCI_ERS_RESULT_RECOVERED; 167 } 168 169 static void hbg_pci_err_reset_prepare(struct pci_dev *pdev) 170 { 171 struct net_device *netdev = pci_get_drvdata(pdev); 172 struct hbg_priv *priv = netdev_priv(netdev); 173 174 rtnl_lock(); 175 hbg_reset_prepare(priv, HBG_RESET_TYPE_FLR); 176 } 177 178 static void hbg_pci_err_reset_done(struct pci_dev *pdev) 179 { 180 struct net_device *netdev = pci_get_drvdata(pdev); 181 struct hbg_priv *priv = netdev_priv(netdev); 182 183 hbg_reset_done(priv, HBG_RESET_TYPE_FLR); 184 rtnl_unlock(); 185 } 186 187 static const struct pci_error_handlers hbg_pci_err_handler = { 188 .error_detected = hbg_pci_err_detected, 189 .slot_reset = hbg_pci_err_slot_reset, 190 .reset_prepare = hbg_pci_err_reset_prepare, 191 .reset_done = hbg_pci_err_reset_done, 192 }; 193 194 void hbg_set_pci_err_handler(struct pci_driver *pdrv) 195 { 196 pdrv->err_handler = &hbg_pci_err_handler; 197 } 198