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![Eric Dumazet](/assets/img/avatar_default.png)
Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
861 lines
19 KiB
C
861 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Common framework for low-level network console, dump, and debugger code
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*
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* Sep 8 2003 Matt Mackall <mpm@selenic.com>
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*
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* based on the netconsole code from:
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*
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* Copyright (C) 2001 Ingo Molnar <mingo@redhat.com>
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* Copyright (C) 2002 Red Hat, Inc.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/string.h>
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#include <linux/if_arp.h>
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#include <linux/inetdevice.h>
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#include <linux/inet.h>
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#include <linux/interrupt.h>
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#include <linux/netpoll.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/rcupdate.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/if_vlan.h>
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#include <net/tcp.h>
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#include <net/udp.h>
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#include <net/addrconf.h>
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#include <net/ndisc.h>
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#include <net/ip6_checksum.h>
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#include <asm/unaligned.h>
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#include <trace/events/napi.h>
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#include <linux/kconfig.h>
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/*
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* We maintain a small pool of fully-sized skbs, to make sure the
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* message gets out even in extreme OOM situations.
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*/
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#define MAX_UDP_CHUNK 1460
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#define MAX_SKBS 32
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static struct sk_buff_head skb_pool;
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DEFINE_STATIC_SRCU(netpoll_srcu);
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#define USEC_PER_POLL 50
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#define MAX_SKB_SIZE \
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(sizeof(struct ethhdr) + \
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sizeof(struct iphdr) + \
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sizeof(struct udphdr) + \
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MAX_UDP_CHUNK)
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static void zap_completion_queue(void);
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static unsigned int carrier_timeout = 4;
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module_param(carrier_timeout, uint, 0644);
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#define np_info(np, fmt, ...) \
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pr_info("%s: " fmt, np->name, ##__VA_ARGS__)
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#define np_err(np, fmt, ...) \
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pr_err("%s: " fmt, np->name, ##__VA_ARGS__)
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#define np_notice(np, fmt, ...) \
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pr_notice("%s: " fmt, np->name, ##__VA_ARGS__)
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static netdev_tx_t netpoll_start_xmit(struct sk_buff *skb,
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struct net_device *dev,
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struct netdev_queue *txq)
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{
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netdev_tx_t status = NETDEV_TX_OK;
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netdev_features_t features;
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features = netif_skb_features(skb);
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if (skb_vlan_tag_present(skb) &&
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!vlan_hw_offload_capable(features, skb->vlan_proto)) {
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skb = __vlan_hwaccel_push_inside(skb);
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if (unlikely(!skb)) {
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/* This is actually a packet drop, but we
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* don't want the code that calls this
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* function to try and operate on a NULL skb.
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*/
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goto out;
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}
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}
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status = netdev_start_xmit(skb, dev, txq, false);
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out:
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return status;
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}
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static void queue_process(struct work_struct *work)
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{
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struct netpoll_info *npinfo =
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container_of(work, struct netpoll_info, tx_work.work);
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struct sk_buff *skb;
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unsigned long flags;
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while ((skb = skb_dequeue(&npinfo->txq))) {
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struct net_device *dev = skb->dev;
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struct netdev_queue *txq;
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unsigned int q_index;
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if (!netif_device_present(dev) || !netif_running(dev)) {
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kfree_skb(skb);
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continue;
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}
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local_irq_save(flags);
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/* check if skb->queue_mapping is still valid */
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q_index = skb_get_queue_mapping(skb);
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if (unlikely(q_index >= dev->real_num_tx_queues)) {
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q_index = q_index % dev->real_num_tx_queues;
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skb_set_queue_mapping(skb, q_index);
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}
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txq = netdev_get_tx_queue(dev, q_index);
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HARD_TX_LOCK(dev, txq, smp_processor_id());
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if (netif_xmit_frozen_or_stopped(txq) ||
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!dev_xmit_complete(netpoll_start_xmit(skb, dev, txq))) {
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skb_queue_head(&npinfo->txq, skb);
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HARD_TX_UNLOCK(dev, txq);
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local_irq_restore(flags);
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schedule_delayed_work(&npinfo->tx_work, HZ/10);
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return;
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}
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HARD_TX_UNLOCK(dev, txq);
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local_irq_restore(flags);
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}
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}
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static void poll_one_napi(struct napi_struct *napi)
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{
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int work;
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/* If we set this bit but see that it has already been set,
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* that indicates that napi has been disabled and we need
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* to abort this operation
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*/
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if (test_and_set_bit(NAPI_STATE_NPSVC, &napi->state))
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return;
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/* We explicilty pass the polling call a budget of 0 to
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* indicate that we are clearing the Tx path only.
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*/
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work = napi->poll(napi, 0);
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WARN_ONCE(work, "%pS exceeded budget in poll\n", napi->poll);
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trace_napi_poll(napi, work, 0);
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clear_bit(NAPI_STATE_NPSVC, &napi->state);
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}
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static void poll_napi(struct net_device *dev)
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{
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struct napi_struct *napi;
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int cpu = smp_processor_id();
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list_for_each_entry_rcu(napi, &dev->napi_list, dev_list) {
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if (cmpxchg(&napi->poll_owner, -1, cpu) == -1) {
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poll_one_napi(napi);
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smp_store_release(&napi->poll_owner, -1);
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}
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}
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}
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void netpoll_poll_dev(struct net_device *dev)
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{
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struct netpoll_info *ni = rcu_dereference_bh(dev->npinfo);
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const struct net_device_ops *ops;
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/* Don't do any rx activity if the dev_lock mutex is held
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* the dev_open/close paths use this to block netpoll activity
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* while changing device state
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*/
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if (!ni || down_trylock(&ni->dev_lock))
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return;
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if (!netif_running(dev)) {
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up(&ni->dev_lock);
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return;
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}
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ops = dev->netdev_ops;
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if (ops->ndo_poll_controller)
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ops->ndo_poll_controller(dev);
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poll_napi(dev);
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up(&ni->dev_lock);
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zap_completion_queue();
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}
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EXPORT_SYMBOL(netpoll_poll_dev);
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void netpoll_poll_disable(struct net_device *dev)
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{
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struct netpoll_info *ni;
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int idx;
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might_sleep();
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idx = srcu_read_lock(&netpoll_srcu);
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ni = srcu_dereference(dev->npinfo, &netpoll_srcu);
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if (ni)
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down(&ni->dev_lock);
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srcu_read_unlock(&netpoll_srcu, idx);
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}
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EXPORT_SYMBOL(netpoll_poll_disable);
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void netpoll_poll_enable(struct net_device *dev)
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{
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struct netpoll_info *ni;
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rcu_read_lock();
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ni = rcu_dereference(dev->npinfo);
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if (ni)
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up(&ni->dev_lock);
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rcu_read_unlock();
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}
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EXPORT_SYMBOL(netpoll_poll_enable);
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static void refill_skbs(void)
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{
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struct sk_buff *skb;
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unsigned long flags;
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spin_lock_irqsave(&skb_pool.lock, flags);
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while (skb_pool.qlen < MAX_SKBS) {
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skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC);
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if (!skb)
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break;
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__skb_queue_tail(&skb_pool, skb);
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}
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spin_unlock_irqrestore(&skb_pool.lock, flags);
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}
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static void zap_completion_queue(void)
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{
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unsigned long flags;
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struct softnet_data *sd = &get_cpu_var(softnet_data);
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if (sd->completion_queue) {
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struct sk_buff *clist;
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local_irq_save(flags);
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clist = sd->completion_queue;
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sd->completion_queue = NULL;
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local_irq_restore(flags);
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while (clist != NULL) {
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struct sk_buff *skb = clist;
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clist = clist->next;
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if (!skb_irq_freeable(skb)) {
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refcount_set(&skb->users, 1);
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dev_kfree_skb_any(skb); /* put this one back */
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} else {
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__kfree_skb(skb);
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}
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}
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}
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put_cpu_var(softnet_data);
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}
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static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve)
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{
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int count = 0;
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struct sk_buff *skb;
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zap_completion_queue();
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refill_skbs();
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repeat:
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skb = alloc_skb(len, GFP_ATOMIC);
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if (!skb)
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skb = skb_dequeue(&skb_pool);
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if (!skb) {
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if (++count < 10) {
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netpoll_poll_dev(np->dev);
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goto repeat;
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}
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return NULL;
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}
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refcount_set(&skb->users, 1);
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skb_reserve(skb, reserve);
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return skb;
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}
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static int netpoll_owner_active(struct net_device *dev)
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{
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struct napi_struct *napi;
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list_for_each_entry_rcu(napi, &dev->napi_list, dev_list) {
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if (napi->poll_owner == smp_processor_id())
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return 1;
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}
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return 0;
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}
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/* call with IRQ disabled */
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static netdev_tx_t __netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
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{
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netdev_tx_t status = NETDEV_TX_BUSY;
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struct net_device *dev;
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unsigned long tries;
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/* It is up to the caller to keep npinfo alive. */
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struct netpoll_info *npinfo;
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lockdep_assert_irqs_disabled();
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dev = np->dev;
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npinfo = rcu_dereference_bh(dev->npinfo);
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if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) {
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dev_kfree_skb_irq(skb);
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return NET_XMIT_DROP;
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}
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/* don't get messages out of order, and no recursion */
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if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) {
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struct netdev_queue *txq;
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txq = netdev_core_pick_tx(dev, skb, NULL);
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/* try until next clock tick */
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for (tries = jiffies_to_usecs(1)/USEC_PER_POLL;
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tries > 0; --tries) {
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if (HARD_TX_TRYLOCK(dev, txq)) {
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if (!netif_xmit_stopped(txq))
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status = netpoll_start_xmit(skb, dev, txq);
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HARD_TX_UNLOCK(dev, txq);
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if (dev_xmit_complete(status))
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break;
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}
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/* tickle device maybe there is some cleanup */
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netpoll_poll_dev(np->dev);
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udelay(USEC_PER_POLL);
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}
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WARN_ONCE(!irqs_disabled(),
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"netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pS)\n",
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dev->name, dev->netdev_ops->ndo_start_xmit);
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}
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if (!dev_xmit_complete(status)) {
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skb_queue_tail(&npinfo->txq, skb);
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schedule_delayed_work(&npinfo->tx_work,0);
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}
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return NETDEV_TX_OK;
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}
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netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
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{
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unsigned long flags;
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netdev_tx_t ret;
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if (unlikely(!np)) {
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dev_kfree_skb_irq(skb);
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ret = NET_XMIT_DROP;
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} else {
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local_irq_save(flags);
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ret = __netpoll_send_skb(np, skb);
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local_irq_restore(flags);
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}
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return ret;
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}
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EXPORT_SYMBOL(netpoll_send_skb);
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void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
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{
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int total_len, ip_len, udp_len;
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struct sk_buff *skb;
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struct udphdr *udph;
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struct iphdr *iph;
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struct ethhdr *eth;
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static atomic_t ip_ident;
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struct ipv6hdr *ip6h;
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if (!IS_ENABLED(CONFIG_PREEMPT_RT))
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WARN_ON_ONCE(!irqs_disabled());
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udp_len = len + sizeof(*udph);
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if (np->ipv6)
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ip_len = udp_len + sizeof(*ip6h);
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else
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ip_len = udp_len + sizeof(*iph);
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total_len = ip_len + LL_RESERVED_SPACE(np->dev);
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skb = find_skb(np, total_len + np->dev->needed_tailroom,
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total_len - len);
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if (!skb)
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return;
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skb_copy_to_linear_data(skb, msg, len);
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skb_put(skb, len);
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skb_push(skb, sizeof(*udph));
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skb_reset_transport_header(skb);
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udph = udp_hdr(skb);
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udph->source = htons(np->local_port);
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udph->dest = htons(np->remote_port);
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udph->len = htons(udp_len);
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if (np->ipv6) {
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udph->check = 0;
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udph->check = csum_ipv6_magic(&np->local_ip.in6,
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&np->remote_ip.in6,
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udp_len, IPPROTO_UDP,
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csum_partial(udph, udp_len, 0));
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if (udph->check == 0)
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udph->check = CSUM_MANGLED_0;
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skb_push(skb, sizeof(*ip6h));
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skb_reset_network_header(skb);
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ip6h = ipv6_hdr(skb);
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/* ip6h->version = 6; ip6h->priority = 0; */
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*(unsigned char *)ip6h = 0x60;
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ip6h->flow_lbl[0] = 0;
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ip6h->flow_lbl[1] = 0;
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ip6h->flow_lbl[2] = 0;
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ip6h->payload_len = htons(sizeof(struct udphdr) + len);
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ip6h->nexthdr = IPPROTO_UDP;
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ip6h->hop_limit = 32;
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ip6h->saddr = np->local_ip.in6;
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ip6h->daddr = np->remote_ip.in6;
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eth = skb_push(skb, ETH_HLEN);
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skb_reset_mac_header(skb);
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skb->protocol = eth->h_proto = htons(ETH_P_IPV6);
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} else {
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udph->check = 0;
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udph->check = csum_tcpudp_magic(np->local_ip.ip,
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np->remote_ip.ip,
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udp_len, IPPROTO_UDP,
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csum_partial(udph, udp_len, 0));
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if (udph->check == 0)
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udph->check = CSUM_MANGLED_0;
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skb_push(skb, sizeof(*iph));
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skb_reset_network_header(skb);
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iph = ip_hdr(skb);
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/* iph->version = 4; iph->ihl = 5; */
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*(unsigned char *)iph = 0x45;
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iph->tos = 0;
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put_unaligned(htons(ip_len), &(iph->tot_len));
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iph->id = htons(atomic_inc_return(&ip_ident));
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iph->frag_off = 0;
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iph->ttl = 64;
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iph->protocol = IPPROTO_UDP;
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iph->check = 0;
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put_unaligned(np->local_ip.ip, &(iph->saddr));
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put_unaligned(np->remote_ip.ip, &(iph->daddr));
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iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
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eth = skb_push(skb, ETH_HLEN);
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skb_reset_mac_header(skb);
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skb->protocol = eth->h_proto = htons(ETH_P_IP);
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}
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ether_addr_copy(eth->h_source, np->dev->dev_addr);
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ether_addr_copy(eth->h_dest, np->remote_mac);
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skb->dev = np->dev;
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netpoll_send_skb(np, skb);
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}
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EXPORT_SYMBOL(netpoll_send_udp);
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void netpoll_print_options(struct netpoll *np)
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{
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np_info(np, "local port %d\n", np->local_port);
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if (np->ipv6)
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np_info(np, "local IPv6 address %pI6c\n", &np->local_ip.in6);
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else
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np_info(np, "local IPv4 address %pI4\n", &np->local_ip.ip);
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np_info(np, "interface '%s'\n", np->dev_name);
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np_info(np, "remote port %d\n", np->remote_port);
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if (np->ipv6)
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np_info(np, "remote IPv6 address %pI6c\n", &np->remote_ip.in6);
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else
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np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip);
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np_info(np, "remote ethernet address %pM\n", np->remote_mac);
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}
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EXPORT_SYMBOL(netpoll_print_options);
|
|
|
|
static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr)
|
|
{
|
|
const char *end;
|
|
|
|
if (!strchr(str, ':') &&
|
|
in4_pton(str, -1, (void *)addr, -1, &end) > 0) {
|
|
if (!*end)
|
|
return 0;
|
|
}
|
|
if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) {
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (!*end)
|
|
return 1;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
int netpoll_parse_options(struct netpoll *np, char *opt)
|
|
{
|
|
char *cur=opt, *delim;
|
|
int ipv6;
|
|
bool ipversion_set = false;
|
|
|
|
if (*cur != '@') {
|
|
if ((delim = strchr(cur, '@')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
if (kstrtou16(cur, 10, &np->local_port))
|
|
goto parse_failed;
|
|
cur = delim;
|
|
}
|
|
cur++;
|
|
|
|
if (*cur != '/') {
|
|
ipversion_set = true;
|
|
if ((delim = strchr(cur, '/')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
ipv6 = netpoll_parse_ip_addr(cur, &np->local_ip);
|
|
if (ipv6 < 0)
|
|
goto parse_failed;
|
|
else
|
|
np->ipv6 = (bool)ipv6;
|
|
cur = delim;
|
|
}
|
|
cur++;
|
|
|
|
if (*cur != ',') {
|
|
/* parse out dev name */
|
|
if ((delim = strchr(cur, ',')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
strlcpy(np->dev_name, cur, sizeof(np->dev_name));
|
|
cur = delim;
|
|
}
|
|
cur++;
|
|
|
|
if (*cur != '@') {
|
|
/* dst port */
|
|
if ((delim = strchr(cur, '@')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
if (*cur == ' ' || *cur == '\t')
|
|
np_info(np, "warning: whitespace is not allowed\n");
|
|
if (kstrtou16(cur, 10, &np->remote_port))
|
|
goto parse_failed;
|
|
cur = delim;
|
|
}
|
|
cur++;
|
|
|
|
/* dst ip */
|
|
if ((delim = strchr(cur, '/')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
ipv6 = netpoll_parse_ip_addr(cur, &np->remote_ip);
|
|
if (ipv6 < 0)
|
|
goto parse_failed;
|
|
else if (ipversion_set && np->ipv6 != (bool)ipv6)
|
|
goto parse_failed;
|
|
else
|
|
np->ipv6 = (bool)ipv6;
|
|
cur = delim + 1;
|
|
|
|
if (*cur != 0) {
|
|
/* MAC address */
|
|
if (!mac_pton(cur, np->remote_mac))
|
|
goto parse_failed;
|
|
}
|
|
|
|
netpoll_print_options(np);
|
|
|
|
return 0;
|
|
|
|
parse_failed:
|
|
np_info(np, "couldn't parse config at '%s'!\n", cur);
|
|
return -1;
|
|
}
|
|
EXPORT_SYMBOL(netpoll_parse_options);
|
|
|
|
int __netpoll_setup(struct netpoll *np, struct net_device *ndev)
|
|
{
|
|
struct netpoll_info *npinfo;
|
|
const struct net_device_ops *ops;
|
|
int err;
|
|
|
|
np->dev = ndev;
|
|
strlcpy(np->dev_name, ndev->name, IFNAMSIZ);
|
|
|
|
if (ndev->priv_flags & IFF_DISABLE_NETPOLL) {
|
|
np_err(np, "%s doesn't support polling, aborting\n",
|
|
np->dev_name);
|
|
err = -ENOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
if (!ndev->npinfo) {
|
|
npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL);
|
|
if (!npinfo) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
sema_init(&npinfo->dev_lock, 1);
|
|
skb_queue_head_init(&npinfo->txq);
|
|
INIT_DELAYED_WORK(&npinfo->tx_work, queue_process);
|
|
|
|
refcount_set(&npinfo->refcnt, 1);
|
|
|
|
ops = np->dev->netdev_ops;
|
|
if (ops->ndo_netpoll_setup) {
|
|
err = ops->ndo_netpoll_setup(ndev, npinfo);
|
|
if (err)
|
|
goto free_npinfo;
|
|
}
|
|
} else {
|
|
npinfo = rtnl_dereference(ndev->npinfo);
|
|
refcount_inc(&npinfo->refcnt);
|
|
}
|
|
|
|
npinfo->netpoll = np;
|
|
|
|
/* last thing to do is link it to the net device structure */
|
|
rcu_assign_pointer(ndev->npinfo, npinfo);
|
|
|
|
return 0;
|
|
|
|
free_npinfo:
|
|
kfree(npinfo);
|
|
out:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__netpoll_setup);
|
|
|
|
int netpoll_setup(struct netpoll *np)
|
|
{
|
|
struct net_device *ndev = NULL;
|
|
struct in_device *in_dev;
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
if (np->dev_name[0]) {
|
|
struct net *net = current->nsproxy->net_ns;
|
|
ndev = __dev_get_by_name(net, np->dev_name);
|
|
}
|
|
if (!ndev) {
|
|
np_err(np, "%s doesn't exist, aborting\n", np->dev_name);
|
|
err = -ENODEV;
|
|
goto unlock;
|
|
}
|
|
dev_hold(ndev);
|
|
|
|
if (netdev_master_upper_dev_get(ndev)) {
|
|
np_err(np, "%s is a slave device, aborting\n", np->dev_name);
|
|
err = -EBUSY;
|
|
goto put;
|
|
}
|
|
|
|
if (!netif_running(ndev)) {
|
|
unsigned long atmost, atleast;
|
|
|
|
np_info(np, "device %s not up yet, forcing it\n", np->dev_name);
|
|
|
|
err = dev_open(ndev, NULL);
|
|
|
|
if (err) {
|
|
np_err(np, "failed to open %s\n", ndev->name);
|
|
goto put;
|
|
}
|
|
|
|
rtnl_unlock();
|
|
atleast = jiffies + HZ/10;
|
|
atmost = jiffies + carrier_timeout * HZ;
|
|
while (!netif_carrier_ok(ndev)) {
|
|
if (time_after(jiffies, atmost)) {
|
|
np_notice(np, "timeout waiting for carrier\n");
|
|
break;
|
|
}
|
|
msleep(1);
|
|
}
|
|
|
|
/* If carrier appears to come up instantly, we don't
|
|
* trust it and pause so that we don't pump all our
|
|
* queued console messages into the bitbucket.
|
|
*/
|
|
|
|
if (time_before(jiffies, atleast)) {
|
|
np_notice(np, "carrier detect appears untrustworthy, waiting 4 seconds\n");
|
|
msleep(4000);
|
|
}
|
|
rtnl_lock();
|
|
}
|
|
|
|
if (!np->local_ip.ip) {
|
|
if (!np->ipv6) {
|
|
const struct in_ifaddr *ifa;
|
|
|
|
in_dev = __in_dev_get_rtnl(ndev);
|
|
if (!in_dev)
|
|
goto put_noaddr;
|
|
|
|
ifa = rtnl_dereference(in_dev->ifa_list);
|
|
if (!ifa) {
|
|
put_noaddr:
|
|
np_err(np, "no IP address for %s, aborting\n",
|
|
np->dev_name);
|
|
err = -EDESTADDRREQ;
|
|
goto put;
|
|
}
|
|
|
|
np->local_ip.ip = ifa->ifa_local;
|
|
np_info(np, "local IP %pI4\n", &np->local_ip.ip);
|
|
} else {
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
struct inet6_dev *idev;
|
|
|
|
err = -EDESTADDRREQ;
|
|
idev = __in6_dev_get(ndev);
|
|
if (idev) {
|
|
struct inet6_ifaddr *ifp;
|
|
|
|
read_lock_bh(&idev->lock);
|
|
list_for_each_entry(ifp, &idev->addr_list, if_list) {
|
|
if (!!(ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL) !=
|
|
!!(ipv6_addr_type(&np->remote_ip.in6) & IPV6_ADDR_LINKLOCAL))
|
|
continue;
|
|
np->local_ip.in6 = ifp->addr;
|
|
err = 0;
|
|
break;
|
|
}
|
|
read_unlock_bh(&idev->lock);
|
|
}
|
|
if (err) {
|
|
np_err(np, "no IPv6 address for %s, aborting\n",
|
|
np->dev_name);
|
|
goto put;
|
|
} else
|
|
np_info(np, "local IPv6 %pI6c\n", &np->local_ip.in6);
|
|
#else
|
|
np_err(np, "IPv6 is not supported %s, aborting\n",
|
|
np->dev_name);
|
|
err = -EINVAL;
|
|
goto put;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/* fill up the skb queue */
|
|
refill_skbs();
|
|
|
|
err = __netpoll_setup(np, ndev);
|
|
if (err)
|
|
goto put;
|
|
netdev_tracker_alloc(ndev, &np->dev_tracker, GFP_KERNEL);
|
|
rtnl_unlock();
|
|
return 0;
|
|
|
|
put:
|
|
dev_put(ndev);
|
|
unlock:
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(netpoll_setup);
|
|
|
|
static int __init netpoll_init(void)
|
|
{
|
|
skb_queue_head_init(&skb_pool);
|
|
return 0;
|
|
}
|
|
core_initcall(netpoll_init);
|
|
|
|
static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head)
|
|
{
|
|
struct netpoll_info *npinfo =
|
|
container_of(rcu_head, struct netpoll_info, rcu);
|
|
|
|
skb_queue_purge(&npinfo->txq);
|
|
|
|
/* we can't call cancel_delayed_work_sync here, as we are in softirq */
|
|
cancel_delayed_work(&npinfo->tx_work);
|
|
|
|
/* clean after last, unfinished work */
|
|
__skb_queue_purge(&npinfo->txq);
|
|
/* now cancel it again */
|
|
cancel_delayed_work(&npinfo->tx_work);
|
|
kfree(npinfo);
|
|
}
|
|
|
|
void __netpoll_cleanup(struct netpoll *np)
|
|
{
|
|
struct netpoll_info *npinfo;
|
|
|
|
npinfo = rtnl_dereference(np->dev->npinfo);
|
|
if (!npinfo)
|
|
return;
|
|
|
|
synchronize_srcu(&netpoll_srcu);
|
|
|
|
if (refcount_dec_and_test(&npinfo->refcnt)) {
|
|
const struct net_device_ops *ops;
|
|
|
|
ops = np->dev->netdev_ops;
|
|
if (ops->ndo_netpoll_cleanup)
|
|
ops->ndo_netpoll_cleanup(np->dev);
|
|
|
|
RCU_INIT_POINTER(np->dev->npinfo, NULL);
|
|
call_rcu(&npinfo->rcu, rcu_cleanup_netpoll_info);
|
|
} else
|
|
RCU_INIT_POINTER(np->dev->npinfo, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__netpoll_cleanup);
|
|
|
|
void __netpoll_free(struct netpoll *np)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
/* Wait for transmitting packets to finish before freeing. */
|
|
synchronize_rcu();
|
|
__netpoll_cleanup(np);
|
|
kfree(np);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__netpoll_free);
|
|
|
|
void netpoll_cleanup(struct netpoll *np)
|
|
{
|
|
rtnl_lock();
|
|
if (!np->dev)
|
|
goto out;
|
|
__netpoll_cleanup(np);
|
|
dev_put_track(np->dev, &np->dev_tracker);
|
|
np->dev = NULL;
|
|
out:
|
|
rtnl_unlock();
|
|
}
|
|
EXPORT_SYMBOL(netpoll_cleanup);
|