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sfc: Move CPU counting for RSS into a separate function, efx_wanted_rx_queues()
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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@ -819,38 +819,48 @@ static void efx_fini_io(struct efx_nic *efx)
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pci_disable_device(efx->pci_dev);
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}
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/* Probe the number and type of interrupts we are able to obtain. */
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static void efx_probe_interrupts(struct efx_nic *efx)
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/* Get number of RX queues wanted. Return number of online CPU
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* packages in the expectation that an IRQ balancer will spread
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* interrupts across them. */
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static int efx_wanted_rx_queues(void)
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{
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int max_channel = efx->type->phys_addr_channels - 1;
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struct msix_entry xentries[EFX_MAX_CHANNELS];
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int rc, i;
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if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
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BUG_ON(!pci_find_capability(efx->pci_dev, PCI_CAP_ID_MSIX));
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if (rss_cpus == 0) {
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cpumask_t core_mask;
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int count;
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int cpu;
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cpus_clear(core_mask);
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efx->rss_queues = 0;
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count = 0;
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for_each_online_cpu(cpu) {
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if (!cpu_isset(cpu, core_mask)) {
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++efx->rss_queues;
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++count;
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cpus_or(core_mask, core_mask,
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topology_core_siblings(cpu));
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}
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}
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} else {
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efx->rss_queues = rss_cpus;
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}
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efx->rss_queues = min(efx->rss_queues, max_channel + 1);
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efx->rss_queues = min(efx->rss_queues, EFX_MAX_CHANNELS);
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return count;
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}
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/* Probe the number and type of interrupts we are able to obtain, and
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* the resulting numbers of channels and RX queues.
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*/
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static void efx_probe_interrupts(struct efx_nic *efx)
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{
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int max_channels =
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min_t(int, efx->type->phys_addr_channels, EFX_MAX_CHANNELS);
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int rc, i;
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if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
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struct msix_entry xentries[EFX_MAX_CHANNELS];
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int wanted_ints;
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/* We want one RX queue and interrupt per CPU package
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* (or as specified by the rss_cpus module parameter).
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* We will need one channel per interrupt.
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*/
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wanted_ints = rss_cpus ? rss_cpus : efx_wanted_rx_queues();
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efx->rss_queues = min(wanted_ints, max_channels);
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/* Request maximum number of MSI interrupts, and fill out
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* the channel interrupt information the allowed allocation */
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for (i = 0; i < efx->rss_queues; i++)
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xentries[i].entry = i;
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rc = pci_enable_msix(efx->pci_dev, xentries, efx->rss_queues);
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