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netpoll: take rcu_read_lock_bh() in netpoll_send_skb_on_dev()

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This patch fixes several problems in the call path of
netpoll_send_skb_on_dev():

1. Disable IRQ's before calling netpoll_send_skb_on_dev().

2. All the callees of netpoll_send_skb_on_dev() should use
   rcu_dereference_bh() to dereference ->npinfo.

3. Rename arp_reply() to netpoll_arp_reply(), the former is too generic.

Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amerigo Wang 2012-08-10 01:24:42 +00:00 committed by David S. Miller
parent 91fe4a4b9e
commit 2899656b49
2 changed files with 20 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/netpoll.h
View File

@ -57,7 +57,10 @@ void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
struct net_device *dev);
static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
{
unsigned long flags;
local_irq_save(flags);
netpoll_send_skb_on_dev(np, skb, np->dev);
local_irq_restore(flags);
}

31
net/core/netpoll.c
View File

@ -54,7 +54,7 @@ static atomic_t trapped;
MAX_UDP_CHUNK)
static void zap_completion_queue(void);
static void arp_reply(struct sk_buff *skb);
static void netpoll_arp_reply(struct sk_buff *skb, struct netpoll_info *npinfo);
static unsigned int carrier_timeout = 4;
module_param(carrier_timeout, uint, 0644);
@ -170,7 +170,8 @@ static void poll_napi(struct net_device *dev)
list_for_each_entry(napi, &dev->napi_list, dev_list) {
if (napi->poll_owner != smp_processor_id() &&
spin_trylock(&napi->poll_lock)) {
budget = poll_one_napi(dev->npinfo, napi, budget);
budget = poll_one_napi(rcu_dereference_bh(dev->npinfo),
napi, budget);
spin_unlock(&napi->poll_lock);
if (!budget)
@ -185,13 +186,14 @@ static void service_arp_queue(struct netpoll_info *npi)
struct sk_buff *skb;
while ((skb = skb_dequeue(&npi->arp_tx)))
arp_reply(skb);
netpoll_arp_reply(skb, npi);
}
}
static void netpoll_poll_dev(struct net_device *dev)
{
const struct net_device_ops *ops;
struct netpoll_info *ni = rcu_dereference_bh(dev->npinfo);
if (!dev || !netif_running(dev))
return;
@ -206,17 +208,18 @@ static void netpoll_poll_dev(struct net_device *dev)
poll_napi(dev);
if (dev->flags & IFF_SLAVE) {
if (dev->npinfo) {
if (ni) {
struct net_device *bond_dev = dev->master;
struct sk_buff *skb;
while ((skb = skb_dequeue(&dev->npinfo->arp_tx))) {
struct netpoll_info *bond_ni = rcu_dereference_bh(bond_dev->npinfo);
while ((skb = skb_dequeue(&ni->arp_tx))) {
skb->dev = bond_dev;
skb_queue_tail(&bond_dev->npinfo->arp_tx, skb);
skb_queue_tail(&bond_ni->arp_tx, skb);
}
}
}
service_arp_queue(dev->npinfo);
service_arp_queue(ni);
zap_completion_queue();
}
@ -302,6 +305,7 @@ static int netpoll_owner_active(struct net_device *dev)
return 0;
}
/* call with IRQ disabled */
void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
struct net_device *dev)
{
@ -309,8 +313,11 @@ void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
unsigned long tries;
const struct net_device_ops *ops = dev->netdev_ops;
/* It is up to the caller to keep npinfo alive. */
struct netpoll_info *npinfo = np->dev->npinfo;
struct netpoll_info *npinfo;
WARN_ON_ONCE(!irqs_disabled());
npinfo = rcu_dereference_bh(np->dev->npinfo);
if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) {
__kfree_skb(skb);
return;
@ -319,11 +326,9 @@ void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
/* don't get messages out of order, and no recursion */
if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) {
struct netdev_queue *txq;
unsigned long flags;
txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
local_irq_save(flags);
/* try until next clock tick */
for (tries = jiffies_to_usecs(1)/USEC_PER_POLL;
tries > 0; --tries) {
@ -347,10 +352,9 @@ void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
}
WARN_ONCE(!irqs_disabled(),
"netpoll_send_skb(): %s enabled interrupts in poll (%pF)\n",
"netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pF)\n",
dev->name, ops->ndo_start_xmit);
local_irq_restore(flags);
}
if (status != NETDEV_TX_OK) {
@ -423,9 +427,8 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
}
EXPORT_SYMBOL(netpoll_send_udp);
static void arp_reply(struct sk_buff *skb)
static void netpoll_arp_reply(struct sk_buff *skb, struct netpoll_info *npinfo)
{
struct netpoll_info *npinfo = skb->dev->npinfo;
struct arphdr *arp;
unsigned char *arp_ptr;
int size, type = ARPOP_REPLY, ptype = ETH_P_ARP;