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Avoid causing TX overflow on small TX queues.

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This commit is contained in:
Michael Brown
2006-05-27 13:55:36 +00:00
parent 70ef6dbb7c
commit cd3ecac809
1 changed files with 9 additions and 3 deletions
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12
src/net/netdevice.c
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@@ -294,7 +294,13 @@ int net_rx_process ( struct pk_buff *pkb ) {
* @v process Network stack process
*
* This polls all interfaces for any received packets, and processes
* any packets that are received during this poll.
* at most one packet from the RX queue.
*
* We avoid processing all received packets, because processing the
* received packet can trigger transmission of a new packet (e.g. an
* ARP response). Since TX completions will be processed as part of
* the poll operation, it is easy to overflow small TX queues if
* multiple packets are processed per poll.
*/
static void net_step ( struct process *process ) {
struct pk_buff *pkb;
@@ -302,8 +308,8 @@ static void net_step ( struct process *process ) {
/* Poll for new packets */
net_poll();
/* Handle any received packets */
while ( ( pkb = net_rx_dequeue () ) ) {
/* Handle at most one received packet */
if ( ( pkb = net_rx_dequeue () ) ) {
net_rx_process ( pkb );
DBG ( "Processed received packet\n" );
}