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sfc: batch up RX delivery 

Improves packet rate of 1-byte UDP receives by up to 10%.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree 2018-07-02 16:12:53 +01:00 committed by David S. Miller
parent f6ad8c1bcd
commit e090bfb9f1
3 changed files with 21 additions and 1 deletions
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12
drivers/net/ethernet/sfc/efx.c
View File

@ -264,11 +264,17 @@ static int efx_check_disabled(struct efx_nic *efx)
static int efx_process_channel(struct efx_channel *channel, int budget)
{
struct efx_tx_queue *tx_queue;
struct list_head rx_list;
int spent;
if (unlikely(!channel->enabled))
return 0;
/* Prepare the batch receive list */
EFX_WARN_ON_PARANOID(channel->rx_list != NULL);
INIT_LIST_HEAD(&rx_list);
channel->rx_list = &rx_list;
efx_for_each_channel_tx_queue(tx_queue, channel) {
tx_queue->pkts_compl = 0;
tx_queue->bytes_compl = 0;
@ -291,6 +297,10 @@ static int efx_process_channel(struct efx_channel *channel, int budget)
}
}
/* Receive any packets we queued up */
netif_receive_skb_list(channel->rx_list);
channel->rx_list = NULL;
return spent;
}
@ -555,6 +565,8 @@ static int efx_probe_channel(struct efx_channel *channel)
goto fail;
}
channel->rx_list = NULL;
return 0;
fail:

3
drivers/net/ethernet/sfc/net_driver.h
View File

@ -448,6 +448,7 @@ enum efx_sync_events_state {
* __efx_rx_packet(), or zero if there is none
* @rx_pkt_index: Ring index of first buffer for next packet to be delivered
* by __efx_rx_packet(), if @rx_pkt_n_frags != 0
* @rx_list: list of SKBs from current RX, awaiting processing
* @rx_queue: RX queue for this channel
* @tx_queue: TX queues for this channel
* @sync_events_state: Current state of sync events on this channel
@ -500,6 +501,8 @@ struct efx_channel {
unsigned int rx_pkt_n_frags;
unsigned int rx_pkt_index;
struct list_head *rx_list;
struct efx_rx_queue rx_queue;
struct efx_tx_queue tx_queue[EFX_TXQ_TYPES];

7
drivers/net/ethernet/sfc/rx.c
View File

@ -634,7 +634,12 @@ static void efx_rx_deliver(struct efx_channel *channel, u8 *eh,
return;
/* Pass the packet up */
netif_receive_skb(skb);
if (channel->rx_list != NULL)
/* Add to list, will pass up later */
list_add_tail(&skb->list, channel->rx_list);
else
/* No list, so pass it up now */
netif_receive_skb(skb);
}
/* Handle a received packet. Second half: Touches packet payload. */