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net: RPS: Enable hardware acceleration of RFS

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Allow drivers for multiqueue hardware with flow filter tables to
accelerate RFS.  The driver must:

1. Set net_device::rx_cpu_rmap to a cpu_rmap of the RX completion
IRQs (in queue order).  This will provide a mapping from CPUs to the
queues for which completions are handled nearest to them.

2. Implement net_device_ops::ndo_rx_flow_steer.  This operation adds
or replaces a filter steering the given flow to the given RX queue, if
possible.

3. Periodically remove filters for which rps_may_expire_flow() returns
true.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings
2011-01-19 11:03:53 +00:00
committed by David S. Miller
parent c39649c331
commit c445477d74
3 changed files with 127 additions and 9 deletions
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33
include/linux/netdevice.h
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@@ -554,14 +554,16 @@ struct rps_map {
#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + (_num * sizeof(u16)))
/*
* The rps_dev_flow structure contains the mapping of a flow to a CPU and the
* tail pointer for that CPU's input queue at the time of last enqueue.
* The rps_dev_flow structure contains the mapping of a flow to a CPU, the
* tail pointer for that CPU's input queue at the time of last enqueue, and
* a hardware filter index.
*/
struct rps_dev_flow {
u16 cpu;
u16 fill;
u16 filter;
unsigned int last_qtail;
};
#define RPS_NO_FILTER 0xffff
/*
* The rps_dev_flow_table structure contains a table of flow mappings.
@@ -611,6 +613,11 @@ static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
#ifdef CONFIG_RFS_ACCEL
extern bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
u32 flow_id, u16 filter_id);
#endif
/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
struct rps_map __rcu *rps_map;
@@ -769,6 +776,13 @@ struct netdev_tc_txq {
* is always called from the stack with the rtnl lock held and netif tx
* queues stopped. This allows the netdevice to perform queue management
* safely.
*
* RFS acceleration.
* int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
* u16 rxq_index, u32 flow_id);
* Set hardware filter for RFS. rxq_index is the target queue index;
* flow_id is a flow ID to be passed to rps_may_expire_flow() later.
* Return the filter ID on success, or a negative error code.
*/
#define HAVE_NET_DEVICE_OPS
struct net_device_ops {
@@ -842,6 +856,12 @@ struct net_device_ops {
int (*ndo_fcoe_get_wwn)(struct net_device *dev,
u64 *wwn, int type);
#endif
#ifdef CONFIG_RFS_ACCEL
int (*ndo_rx_flow_steer)(struct net_device *dev,
const struct sk_buff *skb,
u16 rxq_index,
u32 flow_id);
#endif
};
/*
@@ -1056,6 +1076,13 @@ struct net_device {
/* Number of RX queues currently active in device */
unsigned int real_num_rx_queues;
#ifdef CONFIG_RFS_ACCEL
/* CPU reverse-mapping for RX completion interrupts, indexed
* by RX queue number. Assigned by driver. This must only be
* set if the ndo_rx_flow_steer operation is defined. */
struct cpu_rmap *rx_cpu_rmap;
#endif
#endif
rx_handler_func_t __rcu *rx_handler;