net: RPS: Enable hardware acceleration of RFS

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>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 371fa88..a335f20 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -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;

diff --git a/net/Kconfig b/net/Kconfig
index 7284062..79cabf1 100644 (file)
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -221,6 +221,12 @@ config RPS
        depends on SMP && SYSFS && USE_GENERIC_SMP_HELPERS
        default y
 
+config RFS_ACCEL
+       boolean
+       depends on RPS && GENERIC_HARDIRQS
+       select CPU_RMAP
+       default y
+
 config XPS
        boolean
        depends on SMP && SYSFS && USE_GENERIC_SMP_HELPERS

diff --git a/net/core/dev.c b/net/core/dev.c
index d162ba8..aa76147 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -132,6 +132,7 @@
 #include <trace/events/skb.h>
 #include <linux/pci.h>
 #include <linux/inetdevice.h>
+#include <linux/cpu_rmap.h>
 
 #include "net-sysfs.h"
 
@@ -2588,6 +2589,53 @@ EXPORT_SYMBOL(__skb_get_rxhash);
 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
 EXPORT_SYMBOL(rps_sock_flow_table);
 
+static struct rps_dev_flow *
+set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
+           struct rps_dev_flow *rflow, u16 next_cpu)
+{
+       u16 tcpu;
+
+       tcpu = rflow->cpu = next_cpu;
+       if (tcpu != RPS_NO_CPU) {
+#ifdef CONFIG_RFS_ACCEL
+               struct netdev_rx_queue *rxqueue;
+               struct rps_dev_flow_table *flow_table;
+               struct rps_dev_flow *old_rflow;
+               u32 flow_id;
+               u16 rxq_index;
+               int rc;
+
+               /* Should we steer this flow to a different hardware queue? */
+               if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap)
+                       goto out;
+               rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
+               if (rxq_index == skb_get_rx_queue(skb))
+                       goto out;
+
+               rxqueue = dev->_rx + rxq_index;
+               flow_table = rcu_dereference(rxqueue->rps_flow_table);
+               if (!flow_table)
+                       goto out;
+               flow_id = skb->rxhash & flow_table->mask;
+               rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
+                                                       rxq_index, flow_id);
+               if (rc < 0)
+                       goto out;
+               old_rflow = rflow;
+               rflow = &flow_table->flows[flow_id];
+               rflow->cpu = next_cpu;
+               rflow->filter = rc;
+               if (old_rflow->filter == rflow->filter)
+                       old_rflow->filter = RPS_NO_FILTER;
+       out:
+#endif
+               rflow->last_qtail =
+                       per_cpu(softnet_data, tcpu).input_queue_head;
+       }
+
+       return rflow;
+}
+
 /*
  * get_rps_cpu is called from netif_receive_skb and returns the target
  * CPU from the RPS map of the receiving queue for a given skb.
@@ -2658,12 +2706,9 @@ static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
                if (unlikely(tcpu != next_cpu) &&
                    (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
                     ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
-                     rflow->last_qtail)) >= 0)) {
-                       tcpu = rflow->cpu = next_cpu;
-                       if (tcpu != RPS_NO_CPU)
-                               rflow->last_qtail = per_cpu(softnet_data,
-                                   tcpu).input_queue_head;
-               }
+                     rflow->last_qtail)) >= 0))
+                       rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
+
                if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
                        *rflowp = rflow;
                        cpu = tcpu;
@@ -2684,6 +2729,46 @@ done:
        return cpu;
 }
 
+#ifdef CONFIG_RFS_ACCEL
+
+/**
+ * rps_may_expire_flow - check whether an RFS hardware filter may be removed
+ * @dev: Device on which the filter was set
+ * @rxq_index: RX queue index
+ * @flow_id: Flow ID passed to ndo_rx_flow_steer()
+ * @filter_id: Filter ID returned by ndo_rx_flow_steer()
+ *
+ * Drivers that implement ndo_rx_flow_steer() should periodically call
+ * this function for each installed filter and remove the filters for
+ * which it returns %true.
+ */
+bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
+                        u32 flow_id, u16 filter_id)
+{
+       struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
+       struct rps_dev_flow_table *flow_table;
+       struct rps_dev_flow *rflow;
+       bool expire = true;
+       int cpu;
+
+       rcu_read_lock();
+       flow_table = rcu_dereference(rxqueue->rps_flow_table);
+       if (flow_table && flow_id <= flow_table->mask) {
+               rflow = &flow_table->flows[flow_id];
+               cpu = ACCESS_ONCE(rflow->cpu);
+               if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
+                   ((int)(per_cpu(softnet_data, cpu).input_queue_head -
+                          rflow->last_qtail) <
+                    (int)(10 * flow_table->mask)))
+                       expire = false;
+       }
+       rcu_read_unlock();
+       return expire;
+}
+EXPORT_SYMBOL(rps_may_expire_flow);
+
+#endif /* CONFIG_RFS_ACCEL */
+
 /* Called from hardirq (IPI) context */
 static void rps_trigger_softirq(void *data)
 {