sfc: Break NAPI processing after one ring-full of TX completions
Currently TX completions do not count towards the NAPI budget. This
means a continuous stream of TX completions can cause the polling
function to loop indefinitely with scheduling disabled. To avoid
this, follow the common practice of reporting the budget spent after
processing one ring-full of TX completions.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c
index 1ad61b7..5e3f944 100644
--- a/drivers/net/sfc/efx.c
+++ b/drivers/net/sfc/efx.c
@@ -225,17 +225,17 @@
* never be concurrently called more than once on the same channel,
* though different channels may be being processed concurrently.
*/
-static int efx_process_channel(struct efx_channel *channel, int rx_quota)
+static int efx_process_channel(struct efx_channel *channel, int budget)
{
struct efx_nic *efx = channel->efx;
- int rx_packets;
+ int spent;
if (unlikely(efx->reset_pending != RESET_TYPE_NONE ||
!channel->enabled))
return 0;
- rx_packets = efx_nic_process_eventq(channel, rx_quota);
- if (rx_packets == 0)
+ spent = efx_nic_process_eventq(channel, budget);
+ if (spent == 0)
return 0;
/* Deliver last RX packet. */
@@ -249,7 +249,7 @@
efx_fast_push_rx_descriptors(&efx->rx_queue[channel->channel]);
- return rx_packets;
+ return spent;
}
/* Mark channel as finished processing
@@ -278,14 +278,14 @@
{
struct efx_channel *channel =
container_of(napi, struct efx_channel, napi_str);
- int rx_packets;
+ int spent;
EFX_TRACE(channel->efx, "channel %d NAPI poll executing on CPU %d\n",
channel->channel, raw_smp_processor_id());
- rx_packets = efx_process_channel(channel, budget);
+ spent = efx_process_channel(channel, budget);
- if (rx_packets < budget) {
+ if (spent < budget) {
struct efx_nic *efx = channel->efx;
if (channel->used_flags & EFX_USED_BY_RX &&
@@ -318,7 +318,7 @@
efx_channel_processed(channel);
}
- return rx_packets;
+ return spent;
}
/* Process the eventq of the specified channel immediately on this CPU