Messages in this thread Patch in this message | | | From | Peter P Waskiewicz Jr <> | Subject | [PATCH linux-next v2 2/2] ixgbe: Example usage of the new IRQ affinity_hint callback | Date | Fri, 30 Apr 2010 01:52:21 -0700 |
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This patch uses the new IRQ affinity_hint callback mechanism. It serves purely as an example of how a low-level driver can utilize this new interface.
An official ixgbe patch will be pushed through netdev once the IRQ patches have been accepted and merged.
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> ---
drivers/net/ixgbe/ixgbe.h | 2 ++ drivers/net/ixgbe/ixgbe_main.c | 20 +++++++++++++++++++- 2 files changed, 21 insertions(+), 1 deletions(-)
diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h index 79c35ae..c220b9f 100644 --- a/drivers/net/ixgbe/ixgbe.h +++ b/drivers/net/ixgbe/ixgbe.h @@ -32,6 +32,7 @@ #include <linux/pci.h> #include <linux/netdevice.h> #include <linux/aer.h> +#include <linux/cpumask.h> #include "ixgbe_type.h" #include "ixgbe_common.h" @@ -236,6 +237,7 @@ struct ixgbe_q_vector { u8 tx_itr; u8 rx_itr; u32 eitr; + cpumask_var_t affinity_mask; }; /* Helper macros to switch between ints/sec and what the register uses. diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c index 1b1419c..28f9d6b 100644 --- a/drivers/net/ixgbe/ixgbe_main.c +++ b/drivers/net/ixgbe/ixgbe_main.c @@ -1083,6 +1083,16 @@ static void ixgbe_configure_msix(struct ixgbe_adapter *adapter) q_vector->eitr = adapter->rx_eitr_param; ixgbe_write_eitr(q_vector); + + /* + * Allocate the affinity_hint cpumask, assign the mask for + * this vector, and register our affinity_hint for this irq. + */ + if (!alloc_cpumask_var(&q_vector->affinity_mask, GFP_KERNEL)) + return; + cpumask_set_cpu(v_idx, q_vector->affinity_mask); + irq_register_affinity_hint(adapter->msix_entries[v_idx].vector, + q_vector->affinity_mask); } if (adapter->hw.mac.type == ixgbe_mac_82598EB) @@ -3218,7 +3228,7 @@ void ixgbe_down(struct ixgbe_adapter *adapter) struct ixgbe_hw *hw = &adapter->hw; u32 rxctrl; u32 txdctl; - int i, j; + int i, j, num_q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS; /* signal that we are down to the interrupt handler */ set_bit(__IXGBE_DOWN, &adapter->state); @@ -3251,6 +3261,14 @@ void ixgbe_down(struct ixgbe_adapter *adapter) ixgbe_napi_disable_all(adapter); + for (i = 0; i < num_q_vectors; i++) { + struct ixgbe_q_vector *q_vector = adapter->q_vector[i]; + /* unregister the affinity_hint */ + irq_unregister_affinity_hint(adapter->msix_entries[i].vector); + /* release the CPU mask memory */ + free_cpumask_var(q_vector->affinity_mask); + } + clear_bit(__IXGBE_SFP_MODULE_NOT_FOUND, &adapter->state); del_timer_sync(&adapter->sfp_timer); del_timer_sync(&adapter->watchdog_timer);
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