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authorJeff Moyer <jmoyer@redhat.com>2005-06-23 09:05:31 +0400
committerDavid S. Miller <davem@davemloft.net>2005-06-23 09:05:31 +0400
commit115c1d6e61b70851d9a363328c3b8d4c2559a1d3 (patch)
tree3bc37b036fd3ef72d188ff73da94472b40c05a44 /net/core/netpoll.c
parent6ca4f65e6b390d09e1de7280cf9fd4f5d8e4b48b (diff)
downloadlinux-115c1d6e61b70851d9a363328c3b8d4c2559a1d3.tar.xz
[NETPOLL]: Introduce a netpoll_info struct
This patch introduces a netpoll_info structure, which the struct net_device will now point to instead of pointing to a struct netpoll. The reason for this is two-fold: 1) fields such as the rx_flags, poll_owner, and poll_lock should be maintained per net_device, not per netpoll; and 2) this is a first step in providing support for multiple netpoll clients to register against the same net_device. The struct netpoll is now pointed to by the netpoll_info structure. As such, the previous behaviour of the code is preserved. Signed-off-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/netpoll.c')
-rw-r--r--net/core/netpoll.c57
1 files changed, 38 insertions, 19 deletions
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index a119696d5521..ab3c0c9713b0 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -130,19 +130,20 @@ static int checksum_udp(struct sk_buff *skb, struct udphdr *uh,
*/
static void poll_napi(struct netpoll *np)
{
+ struct netpoll_info *npinfo = np->dev->npinfo;
int budget = 16;
if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) &&
- np->poll_owner != smp_processor_id() &&
- spin_trylock(&np->poll_lock)) {
- np->rx_flags |= NETPOLL_RX_DROP;
+ npinfo->poll_owner != smp_processor_id() &&
+ spin_trylock(&npinfo->poll_lock)) {
+ npinfo->rx_flags |= NETPOLL_RX_DROP;
atomic_inc(&trapped);
np->dev->poll(np->dev, &budget);
atomic_dec(&trapped);
- np->rx_flags &= ~NETPOLL_RX_DROP;
- spin_unlock(&np->poll_lock);
+ npinfo->rx_flags &= ~NETPOLL_RX_DROP;
+ spin_unlock(&npinfo->poll_lock);
}
}
@@ -245,6 +246,7 @@ repeat:
static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
{
int status;
+ struct netpoll_info *npinfo;
repeat:
if(!np || !np->dev || !netif_running(np->dev)) {
@@ -253,8 +255,9 @@ repeat:
}
/* avoid recursion */
- if(np->poll_owner == smp_processor_id() ||
- np->dev->xmit_lock_owner == smp_processor_id()) {
+ npinfo = np->dev->npinfo;
+ if (npinfo->poll_owner == smp_processor_id() ||
+ np->dev->xmit_lock_owner == smp_processor_id()) {
if (np->drop)
np->drop(skb);
else
@@ -341,14 +344,18 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
static void arp_reply(struct sk_buff *skb)
{
+ struct netpoll_info *npinfo = skb->dev->npinfo;
struct arphdr *arp;
unsigned char *arp_ptr;
int size, type = ARPOP_REPLY, ptype = ETH_P_ARP;
u32 sip, tip;
struct sk_buff *send_skb;
- struct netpoll *np = skb->dev->np;
+ struct netpoll *np = NULL;
- if (!np) return;
+ if (npinfo)
+ np = npinfo->np;
+ if (!np)
+ return;
/* No arp on this interface */
if (skb->dev->flags & IFF_NOARP)
@@ -429,7 +436,7 @@ int __netpoll_rx(struct sk_buff *skb)
int proto, len, ulen;
struct iphdr *iph;
struct udphdr *uh;
- struct netpoll *np = skb->dev->np;
+ struct netpoll *np = skb->dev->npinfo->np;
if (!np->rx_hook)
goto out;
@@ -611,9 +618,7 @@ int netpoll_setup(struct netpoll *np)
{
struct net_device *ndev = NULL;
struct in_device *in_dev;
-
- np->poll_lock = SPIN_LOCK_UNLOCKED;
- np->poll_owner = -1;
+ struct netpoll_info *npinfo;
if (np->dev_name)
ndev = dev_get_by_name(np->dev_name);
@@ -624,7 +629,16 @@ int netpoll_setup(struct netpoll *np)
}
np->dev = ndev;
- ndev->np = np;
+ if (!ndev->npinfo) {
+ npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL);
+ if (!npinfo)
+ goto release;
+
+ npinfo->np = NULL;
+ npinfo->poll_lock = SPIN_LOCK_UNLOCKED;
+ npinfo->poll_owner = -1;
+ } else
+ npinfo = ndev->npinfo;
if (!ndev->poll_controller) {
printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n",
@@ -693,12 +707,15 @@ int netpoll_setup(struct netpoll *np)
}
if(np->rx_hook)
- np->rx_flags = NETPOLL_RX_ENABLED;
+ npinfo->rx_flags = NETPOLL_RX_ENABLED;
+ npinfo->np = np;
+ ndev->npinfo = npinfo;
return 0;
release:
- ndev->np = NULL;
+ if (!ndev->npinfo)
+ kfree(npinfo);
np->dev = NULL;
dev_put(ndev);
return -1;
@@ -706,9 +723,11 @@ int netpoll_setup(struct netpoll *np)
void netpoll_cleanup(struct netpoll *np)
{
- if (np->dev)
- np->dev->np = NULL;
- dev_put(np->dev);
+ if (np->dev) {
+ if (np->dev->npinfo)
+ np->dev->npinfo->np = NULL;
+ dev_put(np->dev);
+ }
np->dev = NULL;
}