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973 lines
24 KiB
973 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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// Copyright (c) 2020 Facebook Inc. |
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#include <linux/ethtool_netlink.h> |
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#include <linux/netdevice.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <linux/workqueue.h> |
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#include <net/udp_tunnel.h> |
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#include <net/vxlan.h> |
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enum udp_tunnel_nic_table_entry_flags { |
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UDP_TUNNEL_NIC_ENTRY_ADD = BIT(0), |
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UDP_TUNNEL_NIC_ENTRY_DEL = BIT(1), |
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UDP_TUNNEL_NIC_ENTRY_OP_FAIL = BIT(2), |
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UDP_TUNNEL_NIC_ENTRY_FROZEN = BIT(3), |
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}; |
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struct udp_tunnel_nic_table_entry { |
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__be16 port; |
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u8 type; |
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u8 flags; |
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u16 use_cnt; |
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#define UDP_TUNNEL_NIC_USE_CNT_MAX U16_MAX |
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u8 hw_priv; |
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}; |
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/** |
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* struct udp_tunnel_nic - UDP tunnel port offload state |
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* @work: async work for talking to hardware from process context |
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* @dev: netdev pointer |
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* @need_sync: at least one port start changed |
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* @need_replay: space was freed, we need a replay of all ports |
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* @work_pending: @work is currently scheduled |
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* @n_tables: number of tables under @entries |
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* @missed: bitmap of tables which overflown |
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* @entries: table of tables of ports currently offloaded |
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*/ |
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struct udp_tunnel_nic { |
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struct work_struct work; |
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struct net_device *dev; |
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u8 need_sync:1; |
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u8 need_replay:1; |
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u8 work_pending:1; |
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unsigned int n_tables; |
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unsigned long missed; |
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struct udp_tunnel_nic_table_entry **entries; |
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}; |
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/* We ensure all work structs are done using driver state, but not the code. |
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* We need a workqueue we can flush before module gets removed. |
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*/ |
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static struct workqueue_struct *udp_tunnel_nic_workqueue; |
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static const char *udp_tunnel_nic_tunnel_type_name(unsigned int type) |
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{ |
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switch (type) { |
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case UDP_TUNNEL_TYPE_VXLAN: |
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return "vxlan"; |
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case UDP_TUNNEL_TYPE_GENEVE: |
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return "geneve"; |
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case UDP_TUNNEL_TYPE_VXLAN_GPE: |
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return "vxlan-gpe"; |
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default: |
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return "unknown"; |
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} |
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} |
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static bool |
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udp_tunnel_nic_entry_is_free(struct udp_tunnel_nic_table_entry *entry) |
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{ |
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return entry->use_cnt == 0 && !entry->flags; |
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} |
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static bool |
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udp_tunnel_nic_entry_is_present(struct udp_tunnel_nic_table_entry *entry) |
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{ |
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return entry->use_cnt && !(entry->flags & ~UDP_TUNNEL_NIC_ENTRY_FROZEN); |
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} |
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static bool |
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udp_tunnel_nic_entry_is_frozen(struct udp_tunnel_nic_table_entry *entry) |
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{ |
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return entry->flags & UDP_TUNNEL_NIC_ENTRY_FROZEN; |
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} |
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static void |
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udp_tunnel_nic_entry_freeze_used(struct udp_tunnel_nic_table_entry *entry) |
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{ |
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if (!udp_tunnel_nic_entry_is_free(entry)) |
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entry->flags |= UDP_TUNNEL_NIC_ENTRY_FROZEN; |
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} |
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static void |
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udp_tunnel_nic_entry_unfreeze(struct udp_tunnel_nic_table_entry *entry) |
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{ |
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entry->flags &= ~UDP_TUNNEL_NIC_ENTRY_FROZEN; |
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} |
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static bool |
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udp_tunnel_nic_entry_is_queued(struct udp_tunnel_nic_table_entry *entry) |
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{ |
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return entry->flags & (UDP_TUNNEL_NIC_ENTRY_ADD | |
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UDP_TUNNEL_NIC_ENTRY_DEL); |
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} |
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static void |
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udp_tunnel_nic_entry_queue(struct udp_tunnel_nic *utn, |
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struct udp_tunnel_nic_table_entry *entry, |
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unsigned int flag) |
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{ |
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entry->flags |= flag; |
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utn->need_sync = 1; |
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} |
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static void |
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udp_tunnel_nic_ti_from_entry(struct udp_tunnel_nic_table_entry *entry, |
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struct udp_tunnel_info *ti) |
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{ |
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memset(ti, 0, sizeof(*ti)); |
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ti->port = entry->port; |
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ti->type = entry->type; |
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ti->hw_priv = entry->hw_priv; |
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} |
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static bool |
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udp_tunnel_nic_is_empty(struct net_device *dev, struct udp_tunnel_nic *utn) |
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{ |
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const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
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unsigned int i, j; |
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for (i = 0; i < utn->n_tables; i++) |
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for (j = 0; j < info->tables[i].n_entries; j++) |
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if (!udp_tunnel_nic_entry_is_free(&utn->entries[i][j])) |
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return false; |
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return true; |
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} |
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static bool |
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udp_tunnel_nic_should_replay(struct net_device *dev, struct udp_tunnel_nic *utn) |
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{ |
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const struct udp_tunnel_nic_table_info *table; |
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unsigned int i, j; |
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if (!utn->missed) |
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return false; |
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for (i = 0; i < utn->n_tables; i++) { |
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table = &dev->udp_tunnel_nic_info->tables[i]; |
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if (!test_bit(i, &utn->missed)) |
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continue; |
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for (j = 0; j < table->n_entries; j++) |
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if (udp_tunnel_nic_entry_is_free(&utn->entries[i][j])) |
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return true; |
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} |
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return false; |
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} |
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static void |
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__udp_tunnel_nic_get_port(struct net_device *dev, unsigned int table, |
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unsigned int idx, struct udp_tunnel_info *ti) |
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{ |
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struct udp_tunnel_nic_table_entry *entry; |
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struct udp_tunnel_nic *utn; |
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utn = dev->udp_tunnel_nic; |
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entry = &utn->entries[table][idx]; |
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if (entry->use_cnt) |
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udp_tunnel_nic_ti_from_entry(entry, ti); |
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} |
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static void |
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__udp_tunnel_nic_set_port_priv(struct net_device *dev, unsigned int table, |
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unsigned int idx, u8 priv) |
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{ |
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dev->udp_tunnel_nic->entries[table][idx].hw_priv = priv; |
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} |
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static void |
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udp_tunnel_nic_entry_update_done(struct udp_tunnel_nic_table_entry *entry, |
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int err) |
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{ |
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bool dodgy = entry->flags & UDP_TUNNEL_NIC_ENTRY_OP_FAIL; |
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WARN_ON_ONCE(entry->flags & UDP_TUNNEL_NIC_ENTRY_ADD && |
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entry->flags & UDP_TUNNEL_NIC_ENTRY_DEL); |
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if (entry->flags & UDP_TUNNEL_NIC_ENTRY_ADD && |
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(!err || (err == -EEXIST && dodgy))) |
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entry->flags &= ~UDP_TUNNEL_NIC_ENTRY_ADD; |
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if (entry->flags & UDP_TUNNEL_NIC_ENTRY_DEL && |
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(!err || (err == -ENOENT && dodgy))) |
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entry->flags &= ~UDP_TUNNEL_NIC_ENTRY_DEL; |
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if (!err) |
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entry->flags &= ~UDP_TUNNEL_NIC_ENTRY_OP_FAIL; |
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else |
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entry->flags |= UDP_TUNNEL_NIC_ENTRY_OP_FAIL; |
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} |
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static void |
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udp_tunnel_nic_device_sync_one(struct net_device *dev, |
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struct udp_tunnel_nic *utn, |
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unsigned int table, unsigned int idx) |
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{ |
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struct udp_tunnel_nic_table_entry *entry; |
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struct udp_tunnel_info ti; |
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int err; |
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entry = &utn->entries[table][idx]; |
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if (!udp_tunnel_nic_entry_is_queued(entry)) |
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return; |
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udp_tunnel_nic_ti_from_entry(entry, &ti); |
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if (entry->flags & UDP_TUNNEL_NIC_ENTRY_ADD) |
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err = dev->udp_tunnel_nic_info->set_port(dev, table, idx, &ti); |
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else |
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err = dev->udp_tunnel_nic_info->unset_port(dev, table, idx, |
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&ti); |
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udp_tunnel_nic_entry_update_done(entry, err); |
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if (err) |
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netdev_warn(dev, |
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"UDP tunnel port sync failed port %d type %s: %d\n", |
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be16_to_cpu(entry->port), |
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udp_tunnel_nic_tunnel_type_name(entry->type), |
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err); |
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} |
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static void |
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udp_tunnel_nic_device_sync_by_port(struct net_device *dev, |
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struct udp_tunnel_nic *utn) |
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{ |
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const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
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unsigned int i, j; |
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for (i = 0; i < utn->n_tables; i++) |
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for (j = 0; j < info->tables[i].n_entries; j++) |
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udp_tunnel_nic_device_sync_one(dev, utn, i, j); |
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} |
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static void |
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udp_tunnel_nic_device_sync_by_table(struct net_device *dev, |
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struct udp_tunnel_nic *utn) |
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{ |
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const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
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unsigned int i, j; |
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int err; |
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for (i = 0; i < utn->n_tables; i++) { |
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/* Find something that needs sync in this table */ |
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for (j = 0; j < info->tables[i].n_entries; j++) |
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if (udp_tunnel_nic_entry_is_queued(&utn->entries[i][j])) |
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break; |
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if (j == info->tables[i].n_entries) |
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continue; |
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err = info->sync_table(dev, i); |
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if (err) |
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netdev_warn(dev, "UDP tunnel port sync failed for table %d: %d\n", |
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i, err); |
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for (j = 0; j < info->tables[i].n_entries; j++) { |
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struct udp_tunnel_nic_table_entry *entry; |
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entry = &utn->entries[i][j]; |
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if (udp_tunnel_nic_entry_is_queued(entry)) |
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udp_tunnel_nic_entry_update_done(entry, err); |
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} |
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} |
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} |
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static void |
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__udp_tunnel_nic_device_sync(struct net_device *dev, struct udp_tunnel_nic *utn) |
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{ |
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if (!utn->need_sync) |
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return; |
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if (dev->udp_tunnel_nic_info->sync_table) |
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udp_tunnel_nic_device_sync_by_table(dev, utn); |
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else |
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udp_tunnel_nic_device_sync_by_port(dev, utn); |
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utn->need_sync = 0; |
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/* Can't replay directly here, in case we come from the tunnel driver's |
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* notification - trying to replay may deadlock inside tunnel driver. |
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*/ |
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utn->need_replay = udp_tunnel_nic_should_replay(dev, utn); |
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} |
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static void |
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udp_tunnel_nic_device_sync(struct net_device *dev, struct udp_tunnel_nic *utn) |
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{ |
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const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
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bool may_sleep; |
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if (!utn->need_sync) |
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return; |
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/* Drivers which sleep in the callback need to update from |
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* the workqueue, if we come from the tunnel driver's notification. |
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*/ |
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may_sleep = info->flags & UDP_TUNNEL_NIC_INFO_MAY_SLEEP; |
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if (!may_sleep) |
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__udp_tunnel_nic_device_sync(dev, utn); |
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if (may_sleep || utn->need_replay) { |
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queue_work(udp_tunnel_nic_workqueue, &utn->work); |
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utn->work_pending = 1; |
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} |
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} |
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static bool |
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udp_tunnel_nic_table_is_capable(const struct udp_tunnel_nic_table_info *table, |
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struct udp_tunnel_info *ti) |
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{ |
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return table->tunnel_types & ti->type; |
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} |
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static bool |
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udp_tunnel_nic_is_capable(struct net_device *dev, struct udp_tunnel_nic *utn, |
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struct udp_tunnel_info *ti) |
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{ |
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const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
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unsigned int i; |
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/* Special case IPv4-only NICs */ |
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if (info->flags & UDP_TUNNEL_NIC_INFO_IPV4_ONLY && |
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ti->sa_family != AF_INET) |
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return false; |
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for (i = 0; i < utn->n_tables; i++) |
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if (udp_tunnel_nic_table_is_capable(&info->tables[i], ti)) |
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return true; |
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return false; |
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} |
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static int |
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udp_tunnel_nic_has_collision(struct net_device *dev, struct udp_tunnel_nic *utn, |
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struct udp_tunnel_info *ti) |
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{ |
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const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
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struct udp_tunnel_nic_table_entry *entry; |
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unsigned int i, j; |
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for (i = 0; i < utn->n_tables; i++) |
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for (j = 0; j < info->tables[i].n_entries; j++) { |
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entry = &utn->entries[i][j]; |
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if (!udp_tunnel_nic_entry_is_free(entry) && |
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entry->port == ti->port && |
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entry->type != ti->type) { |
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__set_bit(i, &utn->missed); |
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return true; |
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} |
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} |
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return false; |
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} |
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static void |
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udp_tunnel_nic_entry_adj(struct udp_tunnel_nic *utn, |
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unsigned int table, unsigned int idx, int use_cnt_adj) |
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{ |
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struct udp_tunnel_nic_table_entry *entry = &utn->entries[table][idx]; |
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bool dodgy = entry->flags & UDP_TUNNEL_NIC_ENTRY_OP_FAIL; |
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unsigned int from, to; |
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WARN_ON(entry->use_cnt + (u32)use_cnt_adj > U16_MAX); |
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/* If not going from used to unused or vice versa - all done. |
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* For dodgy entries make sure we try to sync again (queue the entry). |
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*/ |
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entry->use_cnt += use_cnt_adj; |
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if (!dodgy && !entry->use_cnt == !(entry->use_cnt - use_cnt_adj)) |
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return; |
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/* Cancel the op before it was sent to the device, if possible, |
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* otherwise we'd need to take special care to issue commands |
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* in the same order the ports arrived. |
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*/ |
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if (use_cnt_adj < 0) { |
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from = UDP_TUNNEL_NIC_ENTRY_ADD; |
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to = UDP_TUNNEL_NIC_ENTRY_DEL; |
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} else { |
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from = UDP_TUNNEL_NIC_ENTRY_DEL; |
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to = UDP_TUNNEL_NIC_ENTRY_ADD; |
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} |
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if (entry->flags & from) { |
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entry->flags &= ~from; |
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if (!dodgy) |
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return; |
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} |
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udp_tunnel_nic_entry_queue(utn, entry, to); |
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} |
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static bool |
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udp_tunnel_nic_entry_try_adj(struct udp_tunnel_nic *utn, |
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unsigned int table, unsigned int idx, |
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struct udp_tunnel_info *ti, int use_cnt_adj) |
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{ |
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struct udp_tunnel_nic_table_entry *entry = &utn->entries[table][idx]; |
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if (udp_tunnel_nic_entry_is_free(entry) || |
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entry->port != ti->port || |
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entry->type != ti->type) |
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return false; |
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if (udp_tunnel_nic_entry_is_frozen(entry)) |
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return true; |
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udp_tunnel_nic_entry_adj(utn, table, idx, use_cnt_adj); |
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return true; |
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} |
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|
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/* Try to find existing matching entry and adjust its use count, instead of |
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* adding a new one. Returns true if entry was found. In case of delete the |
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* entry may have gotten removed in the process, in which case it will be |
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* queued for removal. |
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*/ |
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static bool |
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udp_tunnel_nic_try_existing(struct net_device *dev, struct udp_tunnel_nic *utn, |
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struct udp_tunnel_info *ti, int use_cnt_adj) |
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{ |
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const struct udp_tunnel_nic_table_info *table; |
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unsigned int i, j; |
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for (i = 0; i < utn->n_tables; i++) { |
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table = &dev->udp_tunnel_nic_info->tables[i]; |
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if (!udp_tunnel_nic_table_is_capable(table, ti)) |
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continue; |
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for (j = 0; j < table->n_entries; j++) |
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if (udp_tunnel_nic_entry_try_adj(utn, i, j, ti, |
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use_cnt_adj)) |
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return true; |
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} |
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|
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return false; |
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} |
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static bool |
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udp_tunnel_nic_add_existing(struct net_device *dev, struct udp_tunnel_nic *utn, |
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struct udp_tunnel_info *ti) |
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{ |
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return udp_tunnel_nic_try_existing(dev, utn, ti, +1); |
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} |
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static bool |
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udp_tunnel_nic_del_existing(struct net_device *dev, struct udp_tunnel_nic *utn, |
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struct udp_tunnel_info *ti) |
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{ |
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return udp_tunnel_nic_try_existing(dev, utn, ti, -1); |
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} |
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|
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static bool |
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udp_tunnel_nic_add_new(struct net_device *dev, struct udp_tunnel_nic *utn, |
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struct udp_tunnel_info *ti) |
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{ |
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const struct udp_tunnel_nic_table_info *table; |
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unsigned int i, j; |
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|
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for (i = 0; i < utn->n_tables; i++) { |
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table = &dev->udp_tunnel_nic_info->tables[i]; |
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if (!udp_tunnel_nic_table_is_capable(table, ti)) |
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continue; |
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|
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for (j = 0; j < table->n_entries; j++) { |
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struct udp_tunnel_nic_table_entry *entry; |
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|
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entry = &utn->entries[i][j]; |
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if (!udp_tunnel_nic_entry_is_free(entry)) |
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continue; |
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|
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entry->port = ti->port; |
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entry->type = ti->type; |
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entry->use_cnt = 1; |
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udp_tunnel_nic_entry_queue(utn, entry, |
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UDP_TUNNEL_NIC_ENTRY_ADD); |
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return true; |
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} |
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|
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/* The different table may still fit this port in, but there |
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* are no devices currently which have multiple tables accepting |
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* the same tunnel type, and false positives are okay. |
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*/ |
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__set_bit(i, &utn->missed); |
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} |
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|
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return false; |
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} |
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|
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static void |
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__udp_tunnel_nic_add_port(struct net_device *dev, struct udp_tunnel_info *ti) |
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{ |
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const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
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struct udp_tunnel_nic *utn; |
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|
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utn = dev->udp_tunnel_nic; |
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if (!utn) |
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return; |
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if (!netif_running(dev) && info->flags & UDP_TUNNEL_NIC_INFO_OPEN_ONLY) |
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return; |
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if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN && |
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ti->port == htons(IANA_VXLAN_UDP_PORT)) { |
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if (ti->type != UDP_TUNNEL_TYPE_VXLAN) |
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netdev_warn(dev, "device assumes port 4789 will be used by vxlan tunnels\n"); |
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return; |
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} |
|
|
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if (!udp_tunnel_nic_is_capable(dev, utn, ti)) |
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return; |
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|
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/* It may happen that a tunnel of one type is removed and different |
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* tunnel type tries to reuse its port before the device was informed. |
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* Rely on utn->missed to re-add this port later. |
|
*/ |
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if (udp_tunnel_nic_has_collision(dev, utn, ti)) |
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return; |
|
|
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if (!udp_tunnel_nic_add_existing(dev, utn, ti)) |
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udp_tunnel_nic_add_new(dev, utn, ti); |
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|
|
udp_tunnel_nic_device_sync(dev, utn); |
|
} |
|
|
|
static void |
|
__udp_tunnel_nic_del_port(struct net_device *dev, struct udp_tunnel_info *ti) |
|
{ |
|
struct udp_tunnel_nic *utn; |
|
|
|
utn = dev->udp_tunnel_nic; |
|
if (!utn) |
|
return; |
|
|
|
if (!udp_tunnel_nic_is_capable(dev, utn, ti)) |
|
return; |
|
|
|
udp_tunnel_nic_del_existing(dev, utn, ti); |
|
|
|
udp_tunnel_nic_device_sync(dev, utn); |
|
} |
|
|
|
static void __udp_tunnel_nic_reset_ntf(struct net_device *dev) |
|
{ |
|
const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
|
struct udp_tunnel_nic *utn; |
|
unsigned int i, j; |
|
|
|
ASSERT_RTNL(); |
|
|
|
utn = dev->udp_tunnel_nic; |
|
if (!utn) |
|
return; |
|
|
|
utn->need_sync = false; |
|
for (i = 0; i < utn->n_tables; i++) |
|
for (j = 0; j < info->tables[i].n_entries; j++) { |
|
struct udp_tunnel_nic_table_entry *entry; |
|
|
|
entry = &utn->entries[i][j]; |
|
|
|
entry->flags &= ~(UDP_TUNNEL_NIC_ENTRY_DEL | |
|
UDP_TUNNEL_NIC_ENTRY_OP_FAIL); |
|
/* We don't release rtnl across ops */ |
|
WARN_ON(entry->flags & UDP_TUNNEL_NIC_ENTRY_FROZEN); |
|
if (!entry->use_cnt) |
|
continue; |
|
|
|
udp_tunnel_nic_entry_queue(utn, entry, |
|
UDP_TUNNEL_NIC_ENTRY_ADD); |
|
} |
|
|
|
__udp_tunnel_nic_device_sync(dev, utn); |
|
} |
|
|
|
static size_t |
|
__udp_tunnel_nic_dump_size(struct net_device *dev, unsigned int table) |
|
{ |
|
const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
|
struct udp_tunnel_nic *utn; |
|
unsigned int j; |
|
size_t size; |
|
|
|
utn = dev->udp_tunnel_nic; |
|
if (!utn) |
|
return 0; |
|
|
|
size = 0; |
|
for (j = 0; j < info->tables[table].n_entries; j++) { |
|
if (!udp_tunnel_nic_entry_is_present(&utn->entries[table][j])) |
|
continue; |
|
|
|
size += nla_total_size(0) + /* _TABLE_ENTRY */ |
|
nla_total_size(sizeof(__be16)) + /* _ENTRY_PORT */ |
|
nla_total_size(sizeof(u32)); /* _ENTRY_TYPE */ |
|
} |
|
|
|
return size; |
|
} |
|
|
|
static int |
|
__udp_tunnel_nic_dump_write(struct net_device *dev, unsigned int table, |
|
struct sk_buff *skb) |
|
{ |
|
const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
|
struct udp_tunnel_nic *utn; |
|
struct nlattr *nest; |
|
unsigned int j; |
|
|
|
utn = dev->udp_tunnel_nic; |
|
if (!utn) |
|
return 0; |
|
|
|
for (j = 0; j < info->tables[table].n_entries; j++) { |
|
if (!udp_tunnel_nic_entry_is_present(&utn->entries[table][j])) |
|
continue; |
|
|
|
nest = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY); |
|
|
|
if (nla_put_be16(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_PORT, |
|
utn->entries[table][j].port) || |
|
nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_TYPE, |
|
ilog2(utn->entries[table][j].type))) |
|
goto err_cancel; |
|
|
|
nla_nest_end(skb, nest); |
|
} |
|
|
|
return 0; |
|
|
|
err_cancel: |
|
nla_nest_cancel(skb, nest); |
|
return -EMSGSIZE; |
|
} |
|
|
|
static const struct udp_tunnel_nic_ops __udp_tunnel_nic_ops = { |
|
.get_port = __udp_tunnel_nic_get_port, |
|
.set_port_priv = __udp_tunnel_nic_set_port_priv, |
|
.add_port = __udp_tunnel_nic_add_port, |
|
.del_port = __udp_tunnel_nic_del_port, |
|
.reset_ntf = __udp_tunnel_nic_reset_ntf, |
|
.dump_size = __udp_tunnel_nic_dump_size, |
|
.dump_write = __udp_tunnel_nic_dump_write, |
|
}; |
|
|
|
static void |
|
udp_tunnel_nic_flush(struct net_device *dev, struct udp_tunnel_nic *utn) |
|
{ |
|
const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
|
unsigned int i, j; |
|
|
|
for (i = 0; i < utn->n_tables; i++) |
|
for (j = 0; j < info->tables[i].n_entries; j++) { |
|
int adj_cnt = -utn->entries[i][j].use_cnt; |
|
|
|
if (adj_cnt) |
|
udp_tunnel_nic_entry_adj(utn, i, j, adj_cnt); |
|
} |
|
|
|
__udp_tunnel_nic_device_sync(dev, utn); |
|
|
|
for (i = 0; i < utn->n_tables; i++) |
|
memset(utn->entries[i], 0, array_size(info->tables[i].n_entries, |
|
sizeof(**utn->entries))); |
|
WARN_ON(utn->need_sync); |
|
utn->need_replay = 0; |
|
} |
|
|
|
static void |
|
udp_tunnel_nic_replay(struct net_device *dev, struct udp_tunnel_nic *utn) |
|
{ |
|
const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
|
struct udp_tunnel_nic_shared_node *node; |
|
unsigned int i, j; |
|
|
|
/* Freeze all the ports we are already tracking so that the replay |
|
* does not double up the refcount. |
|
*/ |
|
for (i = 0; i < utn->n_tables; i++) |
|
for (j = 0; j < info->tables[i].n_entries; j++) |
|
udp_tunnel_nic_entry_freeze_used(&utn->entries[i][j]); |
|
utn->missed = 0; |
|
utn->need_replay = 0; |
|
|
|
if (!info->shared) { |
|
udp_tunnel_get_rx_info(dev); |
|
} else { |
|
list_for_each_entry(node, &info->shared->devices, list) |
|
udp_tunnel_get_rx_info(node->dev); |
|
} |
|
|
|
for (i = 0; i < utn->n_tables; i++) |
|
for (j = 0; j < info->tables[i].n_entries; j++) |
|
udp_tunnel_nic_entry_unfreeze(&utn->entries[i][j]); |
|
} |
|
|
|
static void udp_tunnel_nic_device_sync_work(struct work_struct *work) |
|
{ |
|
struct udp_tunnel_nic *utn = |
|
container_of(work, struct udp_tunnel_nic, work); |
|
|
|
rtnl_lock(); |
|
utn->work_pending = 0; |
|
__udp_tunnel_nic_device_sync(utn->dev, utn); |
|
|
|
if (utn->need_replay) |
|
udp_tunnel_nic_replay(utn->dev, utn); |
|
rtnl_unlock(); |
|
} |
|
|
|
static struct udp_tunnel_nic * |
|
udp_tunnel_nic_alloc(const struct udp_tunnel_nic_info *info, |
|
unsigned int n_tables) |
|
{ |
|
struct udp_tunnel_nic *utn; |
|
unsigned int i; |
|
|
|
utn = kzalloc(sizeof(*utn), GFP_KERNEL); |
|
if (!utn) |
|
return NULL; |
|
utn->n_tables = n_tables; |
|
INIT_WORK(&utn->work, udp_tunnel_nic_device_sync_work); |
|
|
|
utn->entries = kmalloc_array(n_tables, sizeof(void *), GFP_KERNEL); |
|
if (!utn->entries) |
|
goto err_free_utn; |
|
|
|
for (i = 0; i < n_tables; i++) { |
|
utn->entries[i] = kcalloc(info->tables[i].n_entries, |
|
sizeof(*utn->entries[i]), GFP_KERNEL); |
|
if (!utn->entries[i]) |
|
goto err_free_prev_entries; |
|
} |
|
|
|
return utn; |
|
|
|
err_free_prev_entries: |
|
while (i--) |
|
kfree(utn->entries[i]); |
|
kfree(utn->entries); |
|
err_free_utn: |
|
kfree(utn); |
|
return NULL; |
|
} |
|
|
|
static void udp_tunnel_nic_free(struct udp_tunnel_nic *utn) |
|
{ |
|
unsigned int i; |
|
|
|
for (i = 0; i < utn->n_tables; i++) |
|
kfree(utn->entries[i]); |
|
kfree(utn->entries); |
|
kfree(utn); |
|
} |
|
|
|
static int udp_tunnel_nic_register(struct net_device *dev) |
|
{ |
|
const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
|
struct udp_tunnel_nic_shared_node *node = NULL; |
|
struct udp_tunnel_nic *utn; |
|
unsigned int n_tables, i; |
|
|
|
BUILD_BUG_ON(sizeof(utn->missed) * BITS_PER_BYTE < |
|
UDP_TUNNEL_NIC_MAX_TABLES); |
|
/* Expect use count of at most 2 (IPv4, IPv6) per device */ |
|
BUILD_BUG_ON(UDP_TUNNEL_NIC_USE_CNT_MAX < |
|
UDP_TUNNEL_NIC_MAX_SHARING_DEVICES * 2); |
|
|
|
/* Check that the driver info is sane */ |
|
if (WARN_ON(!info->set_port != !info->unset_port) || |
|
WARN_ON(!info->set_port == !info->sync_table) || |
|
WARN_ON(!info->tables[0].n_entries)) |
|
return -EINVAL; |
|
|
|
if (WARN_ON(info->shared && |
|
info->flags & UDP_TUNNEL_NIC_INFO_OPEN_ONLY)) |
|
return -EINVAL; |
|
|
|
n_tables = 1; |
|
for (i = 1; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) { |
|
if (!info->tables[i].n_entries) |
|
continue; |
|
|
|
n_tables++; |
|
if (WARN_ON(!info->tables[i - 1].n_entries)) |
|
return -EINVAL; |
|
} |
|
|
|
/* Create UDP tunnel state structures */ |
|
if (info->shared) { |
|
node = kzalloc(sizeof(*node), GFP_KERNEL); |
|
if (!node) |
|
return -ENOMEM; |
|
|
|
node->dev = dev; |
|
} |
|
|
|
if (info->shared && info->shared->udp_tunnel_nic_info) { |
|
utn = info->shared->udp_tunnel_nic_info; |
|
} else { |
|
utn = udp_tunnel_nic_alloc(info, n_tables); |
|
if (!utn) { |
|
kfree(node); |
|
return -ENOMEM; |
|
} |
|
} |
|
|
|
if (info->shared) { |
|
if (!info->shared->udp_tunnel_nic_info) { |
|
INIT_LIST_HEAD(&info->shared->devices); |
|
info->shared->udp_tunnel_nic_info = utn; |
|
} |
|
|
|
list_add_tail(&node->list, &info->shared->devices); |
|
} |
|
|
|
utn->dev = dev; |
|
dev_hold(dev); |
|
dev->udp_tunnel_nic = utn; |
|
|
|
if (!(info->flags & UDP_TUNNEL_NIC_INFO_OPEN_ONLY)) |
|
udp_tunnel_get_rx_info(dev); |
|
|
|
return 0; |
|
} |
|
|
|
static void |
|
udp_tunnel_nic_unregister(struct net_device *dev, struct udp_tunnel_nic *utn) |
|
{ |
|
const struct udp_tunnel_nic_info *info = dev->udp_tunnel_nic_info; |
|
|
|
/* For a shared table remove this dev from the list of sharing devices |
|
* and if there are other devices just detach. |
|
*/ |
|
if (info->shared) { |
|
struct udp_tunnel_nic_shared_node *node, *first; |
|
|
|
list_for_each_entry(node, &info->shared->devices, list) |
|
if (node->dev == dev) |
|
break; |
|
if (node->dev != dev) |
|
return; |
|
|
|
list_del(&node->list); |
|
kfree(node); |
|
|
|
first = list_first_entry_or_null(&info->shared->devices, |
|
typeof(*first), list); |
|
if (first) { |
|
udp_tunnel_drop_rx_info(dev); |
|
utn->dev = first->dev; |
|
goto release_dev; |
|
} |
|
|
|
info->shared->udp_tunnel_nic_info = NULL; |
|
} |
|
|
|
/* Flush before we check work, so we don't waste time adding entries |
|
* from the work which we will boot immediately. |
|
*/ |
|
udp_tunnel_nic_flush(dev, utn); |
|
|
|
/* Wait for the work to be done using the state, netdev core will |
|
* retry unregister until we give up our reference on this device. |
|
*/ |
|
if (utn->work_pending) |
|
return; |
|
|
|
udp_tunnel_nic_free(utn); |
|
release_dev: |
|
dev->udp_tunnel_nic = NULL; |
|
dev_put(dev); |
|
} |
|
|
|
static int |
|
udp_tunnel_nic_netdevice_event(struct notifier_block *unused, |
|
unsigned long event, void *ptr) |
|
{ |
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
|
const struct udp_tunnel_nic_info *info; |
|
struct udp_tunnel_nic *utn; |
|
|
|
info = dev->udp_tunnel_nic_info; |
|
if (!info) |
|
return NOTIFY_DONE; |
|
|
|
if (event == NETDEV_REGISTER) { |
|
int err; |
|
|
|
err = udp_tunnel_nic_register(dev); |
|
if (err) |
|
netdev_WARN(dev, "failed to register for UDP tunnel offloads: %d", err); |
|
return notifier_from_errno(err); |
|
} |
|
/* All other events will need the udp_tunnel_nic state */ |
|
utn = dev->udp_tunnel_nic; |
|
if (!utn) |
|
return NOTIFY_DONE; |
|
|
|
if (event == NETDEV_UNREGISTER) { |
|
udp_tunnel_nic_unregister(dev, utn); |
|
return NOTIFY_OK; |
|
} |
|
|
|
/* All other events only matter if NIC has to be programmed open */ |
|
if (!(info->flags & UDP_TUNNEL_NIC_INFO_OPEN_ONLY)) |
|
return NOTIFY_DONE; |
|
|
|
if (event == NETDEV_UP) { |
|
WARN_ON(!udp_tunnel_nic_is_empty(dev, utn)); |
|
udp_tunnel_get_rx_info(dev); |
|
return NOTIFY_OK; |
|
} |
|
if (event == NETDEV_GOING_DOWN) { |
|
udp_tunnel_nic_flush(dev, utn); |
|
return NOTIFY_OK; |
|
} |
|
|
|
return NOTIFY_DONE; |
|
} |
|
|
|
static struct notifier_block udp_tunnel_nic_notifier_block __read_mostly = { |
|
.notifier_call = udp_tunnel_nic_netdevice_event, |
|
}; |
|
|
|
static int __init udp_tunnel_nic_init_module(void) |
|
{ |
|
int err; |
|
|
|
udp_tunnel_nic_workqueue = alloc_workqueue("udp_tunnel_nic", 0, 0); |
|
if (!udp_tunnel_nic_workqueue) |
|
return -ENOMEM; |
|
|
|
rtnl_lock(); |
|
udp_tunnel_nic_ops = &__udp_tunnel_nic_ops; |
|
rtnl_unlock(); |
|
|
|
err = register_netdevice_notifier(&udp_tunnel_nic_notifier_block); |
|
if (err) |
|
goto err_unset_ops; |
|
|
|
return 0; |
|
|
|
err_unset_ops: |
|
rtnl_lock(); |
|
udp_tunnel_nic_ops = NULL; |
|
rtnl_unlock(); |
|
destroy_workqueue(udp_tunnel_nic_workqueue); |
|
return err; |
|
} |
|
late_initcall(udp_tunnel_nic_init_module); |
|
|
|
static void __exit udp_tunnel_nic_cleanup_module(void) |
|
{ |
|
unregister_netdevice_notifier(&udp_tunnel_nic_notifier_block); |
|
|
|
rtnl_lock(); |
|
udp_tunnel_nic_ops = NULL; |
|
rtnl_unlock(); |
|
|
|
destroy_workqueue(udp_tunnel_nic_workqueue); |
|
} |
|
module_exit(udp_tunnel_nic_cleanup_module); |
|
|
|
MODULE_LICENSE("GPL");
|
|
|