![Johannes Berg](/assets/img/avatar_default.png)
This patch adds needed_headroom/needed_tailroom members to struct net_device and updates many places that allocate sbks to use them. Not all of them can be converted though, and I'm sure I missed some (I mostly grepped for LL_RESERVED_SPACE) Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: David S. Miller <davem@davemloft.net>
846 lines
19 KiB
C
846 lines
19 KiB
C
/*
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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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#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 <net/tcp.h>
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#include <net/udp.h>
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#include <asm/unaligned.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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#define MAX_QUEUE_DEPTH (MAX_SKBS / 2)
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static struct sk_buff_head skb_pool;
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static atomic_t trapped;
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#define USEC_PER_POLL 50
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#define NETPOLL_RX_ENABLED 1
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#define NETPOLL_RX_DROP 2
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#define MAX_SKB_SIZE \
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(MAX_UDP_CHUNK + sizeof(struct udphdr) + \
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sizeof(struct iphdr) + sizeof(struct ethhdr))
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static void zap_completion_queue(void);
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static void arp_reply(struct sk_buff *skb);
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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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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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netif_tx_lock(dev);
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if ((netif_queue_stopped(dev) ||
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netif_subqueue_stopped(dev, skb)) ||
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dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) {
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skb_queue_head(&npinfo->txq, skb);
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netif_tx_unlock(dev);
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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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netif_tx_unlock(dev);
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local_irq_restore(flags);
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}
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}
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static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh,
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unsigned short ulen, __be32 saddr, __be32 daddr)
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{
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__wsum psum;
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if (uh->check == 0 || skb_csum_unnecessary(skb))
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return 0;
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psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);
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if (skb->ip_summed == CHECKSUM_COMPLETE &&
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!csum_fold(csum_add(psum, skb->csum)))
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return 0;
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skb->csum = psum;
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return __skb_checksum_complete(skb);
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}
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/*
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* Check whether delayed processing was scheduled for our NIC. If so,
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* we attempt to grab the poll lock and use ->poll() to pump the card.
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* If this fails, either we've recursed in ->poll() or it's already
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* running on another CPU.
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*
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* Note: we don't mask interrupts with this lock because we're using
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* trylock here and interrupts are already disabled in the softirq
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* case. Further, we test the poll_owner to avoid recursion on UP
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* systems where the lock doesn't exist.
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*
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* In cases where there is bi-directional communications, reading only
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* one message at a time can lead to packets being dropped by the
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* network adapter, forcing superfluous retries and possibly timeouts.
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* Thus, we set our budget to greater than 1.
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*/
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static int poll_one_napi(struct netpoll_info *npinfo,
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struct napi_struct *napi, int budget)
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{
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int work;
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/* net_rx_action's ->poll() invocations and our's are
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* synchronized by this test which is only made while
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* holding the napi->poll_lock.
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*/
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if (!test_bit(NAPI_STATE_SCHED, &napi->state))
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return budget;
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npinfo->rx_flags |= NETPOLL_RX_DROP;
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atomic_inc(&trapped);
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work = napi->poll(napi, budget);
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atomic_dec(&trapped);
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npinfo->rx_flags &= ~NETPOLL_RX_DROP;
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return budget - work;
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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 budget = 16;
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list_for_each_entry(napi, &dev->napi_list, dev_list) {
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if (napi->poll_owner != smp_processor_id() &&
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spin_trylock(&napi->poll_lock)) {
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budget = poll_one_napi(dev->npinfo, napi, budget);
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spin_unlock(&napi->poll_lock);
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if (!budget)
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break;
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}
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}
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}
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static void service_arp_queue(struct netpoll_info *npi)
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{
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if (npi) {
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struct sk_buff *skb;
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while ((skb = skb_dequeue(&npi->arp_tx)))
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arp_reply(skb);
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}
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}
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void netpoll_poll(struct netpoll *np)
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{
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struct net_device *dev = np->dev;
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if (!dev || !netif_running(dev) || !dev->poll_controller)
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return;
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/* Process pending work on NIC */
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dev->poll_controller(dev);
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poll_napi(dev);
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service_arp_queue(dev->npinfo);
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zap_completion_queue();
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}
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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->destructor) {
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atomic_inc(&skb->users);
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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(np);
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goto repeat;
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}
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return NULL;
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}
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atomic_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(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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static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
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{
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int status = NETDEV_TX_BUSY;
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unsigned long tries;
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struct net_device *dev = np->dev;
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struct netpoll_info *npinfo = np->dev->npinfo;
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if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) {
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__kfree_skb(skb);
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return;
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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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unsigned long flags;
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local_irq_save(flags);
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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 (netif_tx_trylock(dev)) {
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if (!netif_queue_stopped(dev) &&
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!netif_subqueue_stopped(dev, skb))
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status = dev->hard_start_xmit(skb, dev);
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netif_tx_unlock(dev);
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if (status == NETDEV_TX_OK)
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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(np);
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udelay(USEC_PER_POLL);
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}
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local_irq_restore(flags);
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}
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if (status != NETDEV_TX_OK) {
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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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}
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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, eth_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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udp_len = len + sizeof(*udph);
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ip_len = eth_len = udp_len + sizeof(*iph);
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total_len = eth_len + ETH_HLEN + NET_IP_ALIGN;
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skb = find_skb(np, total_len, 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->len += 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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udph->check = 0;
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udph->check = csum_tcpudp_magic(htonl(np->local_ip),
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htonl(np->remote_ip),
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udp_len, IPPROTO_UDP,
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csum_partial((unsigned char *)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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put_unaligned(0x45, (unsigned char *)iph);
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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 = 0;
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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(htonl(np->local_ip), &(iph->saddr));
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put_unaligned(htonl(np->remote_ip), &(iph->daddr));
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iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
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eth = (struct ethhdr *) 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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memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN);
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memcpy(eth->h_dest, np->remote_mac, ETH_ALEN);
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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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static void arp_reply(struct sk_buff *skb)
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{
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struct netpoll_info *npinfo = skb->dev->npinfo;
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struct arphdr *arp;
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unsigned char *arp_ptr;
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int size, type = ARPOP_REPLY, ptype = ETH_P_ARP;
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__be32 sip, tip;
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unsigned char *sha;
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struct sk_buff *send_skb;
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struct netpoll *np = NULL;
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if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev)
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np = npinfo->rx_np;
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if (!np)
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return;
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/* No arp on this interface */
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if (skb->dev->flags & IFF_NOARP)
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return;
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if (!pskb_may_pull(skb, arp_hdr_len(skb->dev)))
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return;
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skb_reset_network_header(skb);
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skb_reset_transport_header(skb);
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arp = arp_hdr(skb);
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if ((arp->ar_hrd != htons(ARPHRD_ETHER) &&
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arp->ar_hrd != htons(ARPHRD_IEEE802)) ||
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arp->ar_pro != htons(ETH_P_IP) ||
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arp->ar_op != htons(ARPOP_REQUEST))
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return;
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arp_ptr = (unsigned char *)(arp+1);
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/* save the location of the src hw addr */
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sha = arp_ptr;
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arp_ptr += skb->dev->addr_len;
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memcpy(&sip, arp_ptr, 4);
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arp_ptr += 4;
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/* if we actually cared about dst hw addr, it would get copied here */
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arp_ptr += skb->dev->addr_len;
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memcpy(&tip, arp_ptr, 4);
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/* Should we ignore arp? */
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if (tip != htonl(np->local_ip) ||
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ipv4_is_loopback(tip) || ipv4_is_multicast(tip))
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return;
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size = arp_hdr_len(skb->dev);
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send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev),
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LL_RESERVED_SPACE(np->dev));
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if (!send_skb)
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return;
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skb_reset_network_header(send_skb);
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arp = (struct arphdr *) skb_put(send_skb, size);
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send_skb->dev = skb->dev;
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send_skb->protocol = htons(ETH_P_ARP);
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/* Fill the device header for the ARP frame */
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if (dev_hard_header(send_skb, skb->dev, ptype,
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sha, np->dev->dev_addr,
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send_skb->len) < 0) {
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kfree_skb(send_skb);
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return;
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}
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/*
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* Fill out the arp protocol part.
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*
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* we only support ethernet device type,
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* which (according to RFC 1390) should always equal 1 (Ethernet).
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*/
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arp->ar_hrd = htons(np->dev->type);
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arp->ar_pro = htons(ETH_P_IP);
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arp->ar_hln = np->dev->addr_len;
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arp->ar_pln = 4;
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arp->ar_op = htons(type);
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arp_ptr=(unsigned char *)(arp + 1);
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memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len);
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arp_ptr += np->dev->addr_len;
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memcpy(arp_ptr, &tip, 4);
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arp_ptr += 4;
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memcpy(arp_ptr, sha, np->dev->addr_len);
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arp_ptr += np->dev->addr_len;
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memcpy(arp_ptr, &sip, 4);
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netpoll_send_skb(np, send_skb);
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}
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int __netpoll_rx(struct sk_buff *skb)
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{
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int proto, len, ulen;
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struct iphdr *iph;
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struct udphdr *uh;
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struct netpoll_info *npi = skb->dev->npinfo;
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struct netpoll *np = npi->rx_np;
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if (!np)
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goto out;
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if (skb->dev->type != ARPHRD_ETHER)
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goto out;
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/* check if netpoll clients need ARP */
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if (skb->protocol == htons(ETH_P_ARP) &&
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atomic_read(&trapped)) {
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skb_queue_tail(&npi->arp_tx, skb);
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return 1;
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}
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proto = ntohs(eth_hdr(skb)->h_proto);
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if (proto != ETH_P_IP)
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goto out;
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if (skb->pkt_type == PACKET_OTHERHOST)
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goto out;
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if (skb_shared(skb))
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goto out;
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iph = (struct iphdr *)skb->data;
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if (!pskb_may_pull(skb, sizeof(struct iphdr)))
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goto out;
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if (iph->ihl < 5 || iph->version != 4)
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goto out;
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if (!pskb_may_pull(skb, iph->ihl*4))
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goto out;
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if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
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goto out;
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len = ntohs(iph->tot_len);
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if (skb->len < len || len < iph->ihl*4)
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goto out;
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/*
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* Our transport medium may have padded the buffer out.
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* Now We trim to the true length of the frame.
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*/
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if (pskb_trim_rcsum(skb, len))
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goto out;
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if (iph->protocol != IPPROTO_UDP)
|
|
goto out;
|
|
|
|
len -= iph->ihl*4;
|
|
uh = (struct udphdr *)(((char *)iph) + iph->ihl*4);
|
|
ulen = ntohs(uh->len);
|
|
|
|
if (ulen != len)
|
|
goto out;
|
|
if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr))
|
|
goto out;
|
|
if (np->local_ip && np->local_ip != ntohl(iph->daddr))
|
|
goto out;
|
|
if (np->remote_ip && np->remote_ip != ntohl(iph->saddr))
|
|
goto out;
|
|
if (np->local_port && np->local_port != ntohs(uh->dest))
|
|
goto out;
|
|
|
|
np->rx_hook(np, ntohs(uh->source),
|
|
(char *)(uh+1),
|
|
ulen - sizeof(struct udphdr));
|
|
|
|
kfree_skb(skb);
|
|
return 1;
|
|
|
|
out:
|
|
if (atomic_read(&trapped)) {
|
|
kfree_skb(skb);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void netpoll_print_options(struct netpoll *np)
|
|
{
|
|
DECLARE_MAC_BUF(mac);
|
|
printk(KERN_INFO "%s: local port %d\n",
|
|
np->name, np->local_port);
|
|
printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
|
|
np->name, HIPQUAD(np->local_ip));
|
|
printk(KERN_INFO "%s: interface %s\n",
|
|
np->name, np->dev_name);
|
|
printk(KERN_INFO "%s: remote port %d\n",
|
|
np->name, np->remote_port);
|
|
printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n",
|
|
np->name, HIPQUAD(np->remote_ip));
|
|
printk(KERN_INFO "%s: remote ethernet address %s\n",
|
|
np->name, print_mac(mac, np->remote_mac));
|
|
}
|
|
|
|
int netpoll_parse_options(struct netpoll *np, char *opt)
|
|
{
|
|
char *cur=opt, *delim;
|
|
|
|
if (*cur != '@') {
|
|
if ((delim = strchr(cur, '@')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
np->local_port = simple_strtol(cur, NULL, 10);
|
|
cur = delim;
|
|
}
|
|
cur++;
|
|
|
|
if (*cur != '/') {
|
|
if ((delim = strchr(cur, '/')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
np->local_ip = ntohl(in_aton(cur));
|
|
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;
|
|
np->remote_port = simple_strtol(cur, NULL, 10);
|
|
cur = delim;
|
|
}
|
|
cur++;
|
|
|
|
/* dst ip */
|
|
if ((delim = strchr(cur, '/')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
np->remote_ip = ntohl(in_aton(cur));
|
|
cur = delim + 1;
|
|
|
|
if (*cur != 0) {
|
|
/* MAC address */
|
|
if ((delim = strchr(cur, ':')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
np->remote_mac[0] = simple_strtol(cur, NULL, 16);
|
|
cur = delim + 1;
|
|
if ((delim = strchr(cur, ':')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
np->remote_mac[1] = simple_strtol(cur, NULL, 16);
|
|
cur = delim + 1;
|
|
if ((delim = strchr(cur, ':')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
np->remote_mac[2] = simple_strtol(cur, NULL, 16);
|
|
cur = delim + 1;
|
|
if ((delim = strchr(cur, ':')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
np->remote_mac[3] = simple_strtol(cur, NULL, 16);
|
|
cur = delim + 1;
|
|
if ((delim = strchr(cur, ':')) == NULL)
|
|
goto parse_failed;
|
|
*delim = 0;
|
|
np->remote_mac[4] = simple_strtol(cur, NULL, 16);
|
|
cur = delim + 1;
|
|
np->remote_mac[5] = simple_strtol(cur, NULL, 16);
|
|
}
|
|
|
|
netpoll_print_options(np);
|
|
|
|
return 0;
|
|
|
|
parse_failed:
|
|
printk(KERN_INFO "%s: couldn't parse config at %s!\n",
|
|
np->name, cur);
|
|
return -1;
|
|
}
|
|
|
|
int netpoll_setup(struct netpoll *np)
|
|
{
|
|
struct net_device *ndev = NULL;
|
|
struct in_device *in_dev;
|
|
struct netpoll_info *npinfo;
|
|
unsigned long flags;
|
|
int err;
|
|
|
|
if (np->dev_name)
|
|
ndev = dev_get_by_name(&init_net, np->dev_name);
|
|
if (!ndev) {
|
|
printk(KERN_ERR "%s: %s doesn't exist, aborting.\n",
|
|
np->name, np->dev_name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
np->dev = ndev;
|
|
if (!ndev->npinfo) {
|
|
npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL);
|
|
if (!npinfo) {
|
|
err = -ENOMEM;
|
|
goto release;
|
|
}
|
|
|
|
npinfo->rx_flags = 0;
|
|
npinfo->rx_np = NULL;
|
|
|
|
spin_lock_init(&npinfo->rx_lock);
|
|
skb_queue_head_init(&npinfo->arp_tx);
|
|
skb_queue_head_init(&npinfo->txq);
|
|
INIT_DELAYED_WORK(&npinfo->tx_work, queue_process);
|
|
|
|
atomic_set(&npinfo->refcnt, 1);
|
|
} else {
|
|
npinfo = ndev->npinfo;
|
|
atomic_inc(&npinfo->refcnt);
|
|
}
|
|
|
|
if (!ndev->poll_controller) {
|
|
printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n",
|
|
np->name, np->dev_name);
|
|
err = -ENOTSUPP;
|
|
goto release;
|
|
}
|
|
|
|
if (!netif_running(ndev)) {
|
|
unsigned long atmost, atleast;
|
|
|
|
printk(KERN_INFO "%s: device %s not up yet, forcing it\n",
|
|
np->name, np->dev_name);
|
|
|
|
rtnl_lock();
|
|
err = dev_open(ndev);
|
|
rtnl_unlock();
|
|
|
|
if (err) {
|
|
printk(KERN_ERR "%s: failed to open %s\n",
|
|
np->name, ndev->name);
|
|
goto release;
|
|
}
|
|
|
|
atleast = jiffies + HZ/10;
|
|
atmost = jiffies + 4*HZ;
|
|
while (!netif_carrier_ok(ndev)) {
|
|
if (time_after(jiffies, atmost)) {
|
|
printk(KERN_NOTICE
|
|
"%s: timeout waiting for carrier\n",
|
|
np->name);
|
|
break;
|
|
}
|
|
cond_resched();
|
|
}
|
|
|
|
/* 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)) {
|
|
printk(KERN_NOTICE "%s: carrier detect appears"
|
|
" untrustworthy, waiting 4 seconds\n",
|
|
np->name);
|
|
msleep(4000);
|
|
}
|
|
}
|
|
|
|
if (!np->local_ip) {
|
|
rcu_read_lock();
|
|
in_dev = __in_dev_get_rcu(ndev);
|
|
|
|
if (!in_dev || !in_dev->ifa_list) {
|
|
rcu_read_unlock();
|
|
printk(KERN_ERR "%s: no IP address for %s, aborting\n",
|
|
np->name, np->dev_name);
|
|
err = -EDESTADDRREQ;
|
|
goto release;
|
|
}
|
|
|
|
np->local_ip = ntohl(in_dev->ifa_list->ifa_local);
|
|
rcu_read_unlock();
|
|
printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n",
|
|
np->name, HIPQUAD(np->local_ip));
|
|
}
|
|
|
|
if (np->rx_hook) {
|
|
spin_lock_irqsave(&npinfo->rx_lock, flags);
|
|
npinfo->rx_flags |= NETPOLL_RX_ENABLED;
|
|
npinfo->rx_np = np;
|
|
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
|
|
}
|
|
|
|
/* fill up the skb queue */
|
|
refill_skbs();
|
|
|
|
/* last thing to do is link it to the net device structure */
|
|
ndev->npinfo = npinfo;
|
|
|
|
/* avoid racing with NAPI reading npinfo */
|
|
synchronize_rcu();
|
|
|
|
return 0;
|
|
|
|
release:
|
|
if (!ndev->npinfo)
|
|
kfree(npinfo);
|
|
np->dev = NULL;
|
|
dev_put(ndev);
|
|
return err;
|
|
}
|
|
|
|
static int __init netpoll_init(void)
|
|
{
|
|
skb_queue_head_init(&skb_pool);
|
|
return 0;
|
|
}
|
|
core_initcall(netpoll_init);
|
|
|
|
void netpoll_cleanup(struct netpoll *np)
|
|
{
|
|
struct netpoll_info *npinfo;
|
|
unsigned long flags;
|
|
|
|
if (np->dev) {
|
|
npinfo = np->dev->npinfo;
|
|
if (npinfo) {
|
|
if (npinfo->rx_np == np) {
|
|
spin_lock_irqsave(&npinfo->rx_lock, flags);
|
|
npinfo->rx_np = NULL;
|
|
npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
|
|
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
|
|
}
|
|
|
|
if (atomic_dec_and_test(&npinfo->refcnt)) {
|
|
skb_queue_purge(&npinfo->arp_tx);
|
|
skb_queue_purge(&npinfo->txq);
|
|
cancel_rearming_delayed_work(&npinfo->tx_work);
|
|
|
|
/* clean after last, unfinished work */
|
|
__skb_queue_purge(&npinfo->txq);
|
|
kfree(npinfo);
|
|
np->dev->npinfo = NULL;
|
|
}
|
|
}
|
|
|
|
dev_put(np->dev);
|
|
}
|
|
|
|
np->dev = NULL;
|
|
}
|
|
|
|
int netpoll_trap(void)
|
|
{
|
|
return atomic_read(&trapped);
|
|
}
|
|
|
|
void netpoll_set_trap(int trap)
|
|
{
|
|
if (trap)
|
|
atomic_inc(&trapped);
|
|
else
|
|
atomic_dec(&trapped);
|
|
}
|
|
|
|
EXPORT_SYMBOL(netpoll_set_trap);
|
|
EXPORT_SYMBOL(netpoll_trap);
|
|
EXPORT_SYMBOL(netpoll_print_options);
|
|
EXPORT_SYMBOL(netpoll_parse_options);
|
|
EXPORT_SYMBOL(netpoll_setup);
|
|
EXPORT_SYMBOL(netpoll_cleanup);
|
|
EXPORT_SYMBOL(netpoll_send_udp);
|
|
EXPORT_SYMBOL(netpoll_poll);
|