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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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41
drivers/net/sfc/efx.c
View file

@ -64,13 +64,15 @@ MODULE_PARM_DESC(lro, "Large receive offload acceleration");
/*
* Use separate channels for TX and RX events
*
* Set this to 1 to use separate channels for TX and RX. It allows us to
* apply a higher level of interrupt moderation to TX events.
* Set this to 1 to use separate channels for TX and RX. It allows us
* to control interrupt affinity separately for TX and RX.
*
* This is forced to 0 for MSI interrupt mode as the interrupt vector
* is not written
* This is only used in MSI-X interrupt mode
*/
static unsigned int separate_tx_and_rx_channels = true;
static unsigned int separate_tx_channels;
module_param(separate_tx_channels, uint, 0644);
MODULE_PARM_DESC(separate_tx_channels,
"Use separate channels for TX and RX");
/* This is the weight assigned to each of the (per-channel) virtual
* NAPI devices.
@ -846,26 +848,33 @@ static void efx_probe_interrupts(struct efx_nic *efx)
if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
struct msix_entry xentries[EFX_MAX_CHANNELS];
int wanted_ints;
int rx_queues;
/* We want one RX queue and interrupt per CPU package
* (or as specified by the rss_cpus module parameter).
* We will need one channel per interrupt.
*/
wanted_ints = rss_cpus ? rss_cpus : efx_wanted_rx_queues();
efx->n_rx_queues = min(wanted_ints, max_channels);
rx_queues = rss_cpus ? rss_cpus : efx_wanted_rx_queues();
wanted_ints = rx_queues + (separate_tx_channels ? 1 : 0);
wanted_ints = min(wanted_ints, max_channels);
for (i = 0; i < efx->n_rx_queues; i++)
for (i = 0; i < wanted_ints; i++)
xentries[i].entry = i;
rc = pci_enable_msix(efx->pci_dev, xentries, efx->n_rx_queues);
rc = pci_enable_msix(efx->pci_dev, xentries, wanted_ints);
if (rc > 0) {
EFX_BUG_ON_PARANOID(rc >= efx->n_rx_queues);
efx->n_rx_queues = rc;
EFX_ERR(efx, "WARNING: Insufficient MSI-X vectors"
" available (%d < %d).\n", rc, wanted_ints);
EFX_ERR(efx, "WARNING: Performance may be reduced.\n");
EFX_BUG_ON_PARANOID(rc >= wanted_ints);
wanted_ints = rc;
rc = pci_enable_msix(efx->pci_dev, xentries,
efx->n_rx_queues);
wanted_ints);
}
if (rc == 0) {
for (i = 0; i < efx->n_rx_queues; i++)
efx->n_rx_queues = min(rx_queues, wanted_ints);
efx->n_channels = wanted_ints;
for (i = 0; i < wanted_ints; i++)
efx->channel[i].irq = xentries[i].vector;
} else {
/* Fall back to single channel MSI */
@ -877,6 +886,7 @@ static void efx_probe_interrupts(struct efx_nic *efx)
/* Try single interrupt MSI */
if (efx->interrupt_mode == EFX_INT_MODE_MSI) {
efx->n_rx_queues = 1;
efx->n_channels = 1;
rc = pci_enable_msi(efx->pci_dev);
if (rc == 0) {
efx->channel[0].irq = efx->pci_dev->irq;
@ -889,6 +899,7 @@ static void efx_probe_interrupts(struct efx_nic *efx)
/* Assume legacy interrupts */
if (efx->interrupt_mode == EFX_INT_MODE_LEGACY) {
efx->n_rx_queues = 1;
efx->n_channels = 1 + (separate_tx_channels ? 1 : 0);
efx->legacy_irq = efx->pci_dev->irq;
}
}
@ -913,8 +924,8 @@ static void efx_set_channels(struct efx_nic *efx)
struct efx_rx_queue *rx_queue;
efx_for_each_tx_queue(tx_queue, efx) {
if (!EFX_INT_MODE_USE_MSI(efx) && separate_tx_and_rx_channels)
tx_queue->channel = &efx->channel[1];
if (separate_tx_channels)
tx_queue->channel = &efx->channel[efx->n_channels-1];
else
tx_queue->channel = &efx->channel[0];
tx_queue->channel->used_flags |= EFX_USED_BY_TX;

2
drivers/net/sfc/net_driver.h
View file

@ -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;