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[NETPOLL]: allow multiple netpoll_clients to register against one interface

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This patch provides support for registering multiple netpoll clients to the
same network device.  Only one of these clients may register an rx_hook,
however.  In practice, this restriction has not been problematic.  It is
worth mentioning, though, that the current design can be easily extended to
allow for the registration of multiple rx_hooks.

The basic idea of the patch is that the rx_np pointer in the netpoll_info
structure points to the struct netpoll that has rx_hook filled in.  Aside
from this one case, there is no need for a pointer from the struct
net_device to an individual struct netpoll.

A lock is introduced to protect the setting and clearing of the np_rx
pointer.  The pointer will only be cleared upon netpoll client module
removal, and the lock should be uncontested.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jeff Moyer 2005-06-22 22:05:59 -07:00 • committed by David S. Miller
parent 115c1d6e61
commit fbeec2e155
2 changed files with 41 additions and 13 deletions
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15
include/linux/netpoll.h
View file

@ -27,7 +27,8 @@ struct netpoll_info {
spinlock_t poll_lock;
int poll_owner;
int rx_flags;
struct netpoll *np;
spinlock_t rx_lock;
struct netpoll *rx_np; /* netpoll that registered an rx_hook */
};
void netpoll_poll(struct netpoll *np);
@ -44,11 +45,19 @@ void netpoll_queue(struct sk_buff *skb);
static inline int netpoll_rx(struct sk_buff *skb)
{
struct netpoll_info *npinfo = skb->dev->npinfo;
unsigned long flags;
int ret = 0;
if (!npinfo || !npinfo->rx_flags)
if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags))
return 0;
return npinfo->np && __netpoll_rx(skb);
spin_lock_irqsave(&npinfo->rx_lock, flags);
/* check rx_flags again with the lock held */
if (npinfo->rx_flags && __netpoll_rx(skb))
ret = 1;
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
return ret;
}
static inline void netpoll_poll_lock(struct net_device *dev)