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sfc: Add option to use a separate channel for TX completions

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In a bidirectional forwarding test, we find that the best performance
is achieved by sending the TX completion interrupts from one NIC to a
CPU which shares an L2 cache with RX completion interrupts from the
other NIC.  To facilitate this, add an option (through a module
parameter) to create separate channels for RX and TX completion with
separate IRQs when MSI-X is available.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Turton
2008-12-12 21:41:06 -08:00
committed by David S. Miller
parent 84ae48fe4c
commit 28b581ab0a
2 changed files with 28 additions and 15 deletions
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2
drivers/net/sfc/net_driver.h
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@@ -649,6 +649,7 @@ union efx_multicast_hash {
* @rx_queue: RX DMA queues
* @channel: Channels
* @n_rx_queues: Number of RX queues
* @n_channels: Number of channels in use
* @rx_buffer_len: RX buffer length
* @rx_buffer_order: Order (log2) of number of pages for each RX buffer
* @irq_status: Interrupt status buffer
@@ -728,6 +729,7 @@ struct efx_nic {
struct efx_channel channel[EFX_MAX_CHANNELS];
int n_rx_queues;
int n_channels;
unsigned int rx_buffer_len;
unsigned int rx_buffer_order;