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sfc: Skip RX end-of-batch work on channels without an RX queue

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The code in efx_process_channel() to update the RX queue after each
batch of RX completions works out as a no-op on a TX-only channel
where the RX queue structure is set to all-zeroes, but
(1) efx_channel_get_rx_queue() will BUG() if DEBUG is defined, and
(2) it's a waste of time.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2012-02-13 23:29:16 +00:00
parent 7280f5ae0d
commit d9ab70079a
1 changed files with 11 additions and 10 deletions
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21
drivers/net/ethernet/sfc/efx.c
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@ -224,19 +224,20 @@ static int efx_process_channel(struct efx_channel *channel, int budget)
return 0;
spent = efx_nic_process_eventq(channel, budget);
if (spent == 0)
return 0;
if (spent && efx_channel_has_rx_queue(channel)) {
struct efx_rx_queue *rx_queue =
efx_channel_get_rx_queue(channel);
/* Deliver last RX packet. */
if (channel->rx_pkt) {
__efx_rx_packet(channel, channel->rx_pkt);
channel->rx_pkt = NULL;
/* Deliver last RX packet. */
if (channel->rx_pkt) {
__efx_rx_packet(channel, channel->rx_pkt);
channel->rx_pkt = NULL;
}
efx_rx_strategy(channel);
efx_fast_push_rx_descriptors(rx_queue);
}
efx_rx_strategy(channel);
efx_fast_push_rx_descriptors(efx_channel_get_rx_queue(channel));
return spent;
}