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[netdevice] Allow per-device receive queue processing to be frozen

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Several use cases (e.g. the UNDI API and the EFI SNP API) require
access to the raw network device receive queue, and so currently use
manual calls to netdev_poll() on a specific network device in order to
prevent received packets from being processed by the network stack.

As an alternative, provide a flag that allows receive queue processing
to be frozen on a per-device basis.  When receive queue processing is
frozen, packets will be enqueued as normal, but will not be
automatically dequeued and passed up the network stack.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2010-11-20 04:56:25 +00:00
parent 006d9f1f60
commit 4576c2da58
2 changed files with 57 additions and 6 deletions
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24
src/net/netdevice.c
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@@ -669,14 +669,12 @@ int net_rx ( struct io_buffer *iobuf, struct net_device *netdev,
}
/**
* Single-step the network stack
*
* @v process Network stack process
* Poll the network stack
*
* This polls all interfaces for received packets, and processes
* packets from the RX queue.
*/
static void net_step ( struct process *process __unused ) {
void net_poll ( void ) {
struct net_device *netdev;
struct io_buffer *iobuf;
struct ll_protocol *ll_protocol;
@@ -691,6 +689,15 @@ static void net_step ( struct process *process __unused ) {
/* Poll for new packets */
netdev_poll ( netdev );
/* Leave received packets on the queue if receive
* queue processing is currently frozen. This will
* happen when the raw packets are to be manually
* dequeued using netdev_rx_dequeue(), rather than
* processed via the usual networking stack.
*/
if ( netdev_rx_frozen ( netdev ) )
continue;
/* Process at most one received packet. Give priority
* to getting packets out of the NIC over processing
* the received packets, because we advertise a window
@@ -723,6 +730,15 @@ static void net_step ( struct process *process __unused ) {
}
}
/**
* Single-step the network stack
*
* @v process Network stack process
*/
static void net_step ( struct process *process __unused ) {
net_poll();
}
/** Networking stack process */
struct process net_process __permanent_process = {
.list = LIST_HEAD_INIT ( net_process.list ),