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net: Refactor XPS for CPUs and Rx queues
Refactor XPS code to support Tx queue selection based on CPU(s) map or Rx queue(s) map. Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amritha Nambiar
David S. Miller
parent
1a84d7fdb5
commit
80d19669ec
@ -115,12 +115,17 @@ extern struct cpumask __cpu_active_mask;
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#define cpu_active(cpu) ((cpu) == 0)
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#endif
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static inline void cpu_max_bits_warn(unsigned int cpu, unsigned int bits)
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{
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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WARN_ON_ONCE(cpu >= bits);
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#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
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}
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/* verify cpu argument to cpumask_* operators */
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static inline unsigned int cpumask_check(unsigned int cpu)
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{
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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WARN_ON_ONCE(cpu >= nr_cpumask_bits);
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#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
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cpu_max_bits_warn(cpu, nr_cpumask_bits);
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return cpu;
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}
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@ -731,10 +731,15 @@ struct xps_map {
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*/
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struct xps_dev_maps {
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struct rcu_head rcu;
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struct xps_map __rcu *cpu_map[0];
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struct xps_map __rcu *attr_map[0]; /* Either CPUs map or RXQs map */
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};
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#define XPS_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) + \
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#define XPS_CPU_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) + \
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(nr_cpu_ids * (_tcs) * sizeof(struct xps_map *)))
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#define XPS_RXQ_DEV_MAPS_SIZE(_tcs, _rxqs) (sizeof(struct xps_dev_maps) +\
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(_rxqs * (_tcs) * sizeof(struct xps_map *)))
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#endif /* CONFIG_XPS */
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#define TC_MAX_QUEUE 16
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@ -1910,7 +1915,8 @@ struct net_device {
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int watchdog_timeo;
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#ifdef CONFIG_XPS
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struct xps_dev_maps __rcu *xps_maps;
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struct xps_dev_maps __rcu *xps_cpus_map;
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struct xps_dev_maps __rcu *xps_rxqs_map;
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#endif
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#ifdef CONFIG_NET_CLS_ACT
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struct mini_Qdisc __rcu *miniq_egress;
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@ -3259,6 +3265,92 @@ static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
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#ifdef CONFIG_XPS
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int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
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u16 index);
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int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
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u16 index, bool is_rxqs_map);
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/**
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* netif_attr_test_mask - Test a CPU or Rx queue set in a mask
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* @j: CPU/Rx queue index
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* @mask: bitmask of all cpus/rx queues
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* @nr_bits: number of bits in the bitmask
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*
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* Test if a CPU or Rx queue index is set in a mask of all CPU/Rx queues.
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*/
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static inline bool netif_attr_test_mask(unsigned long j,
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const unsigned long *mask,
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unsigned int nr_bits)
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{
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cpu_max_bits_warn(j, nr_bits);
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return test_bit(j, mask);
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}
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/**
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* netif_attr_test_online - Test for online CPU/Rx queue
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* @j: CPU/Rx queue index
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* @online_mask: bitmask for CPUs/Rx queues that are online
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* @nr_bits: number of bits in the bitmask
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*
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* Returns true if a CPU/Rx queue is online.
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*/
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static inline bool netif_attr_test_online(unsigned long j,
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const unsigned long *online_mask,
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unsigned int nr_bits)
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{
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cpu_max_bits_warn(j, nr_bits);
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if (online_mask)
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return test_bit(j, online_mask);
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return (j < nr_bits);
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}
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/**
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* netif_attrmask_next - get the next CPU/Rx queue in a cpu/Rx queues mask
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* @n: CPU/Rx queue index
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* @srcp: the cpumask/Rx queue mask pointer
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* @nr_bits: number of bits in the bitmask
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*
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* Returns >= nr_bits if no further CPUs/Rx queues set.
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*/
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static inline unsigned int netif_attrmask_next(int n, const unsigned long *srcp,
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unsigned int nr_bits)
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{
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/* -1 is a legal arg here. */
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if (n != -1)
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cpu_max_bits_warn(n, nr_bits);
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if (srcp)
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return find_next_bit(srcp, nr_bits, n + 1);
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return n + 1;
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}
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/**
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* netif_attrmask_next_and - get the next CPU/Rx queue in *src1p & *src2p
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* @n: CPU/Rx queue index
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* @src1p: the first CPUs/Rx queues mask pointer
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* @src2p: the second CPUs/Rx queues mask pointer
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* @nr_bits: number of bits in the bitmask
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*
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* Returns >= nr_bits if no further CPUs/Rx queues set in both.
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*/
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static inline int netif_attrmask_next_and(int n, const unsigned long *src1p,
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const unsigned long *src2p,
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unsigned int nr_bits)
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{
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/* -1 is a legal arg here. */
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if (n != -1)
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cpu_max_bits_warn(n, nr_bits);
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if (src1p && src2p)
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return find_next_and_bit(src1p, src2p, nr_bits, n + 1);
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else if (src1p)
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return find_next_bit(src1p, nr_bits, n + 1);
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else if (src2p)
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return find_next_bit(src2p, nr_bits, n + 1);
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return n + 1;
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}
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#else
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static inline int netif_set_xps_queue(struct net_device *dev,
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const struct cpumask *mask,
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211
net/core/dev.c
211
net/core/dev.c
@ -2092,7 +2092,7 @@ static bool remove_xps_queue(struct xps_dev_maps *dev_maps,
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int pos;
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if (dev_maps)
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map = xmap_dereference(dev_maps->cpu_map[tci]);
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map = xmap_dereference(dev_maps->attr_map[tci]);
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if (!map)
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return false;
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@ -2105,7 +2105,7 @@ static bool remove_xps_queue(struct xps_dev_maps *dev_maps,
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break;
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}
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RCU_INIT_POINTER(dev_maps->cpu_map[tci], NULL);
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RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL);
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kfree_rcu(map, rcu);
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return false;
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}
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@ -2135,31 +2135,58 @@ static bool remove_xps_queue_cpu(struct net_device *dev,
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return active;
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}
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static void clean_xps_maps(struct net_device *dev, const unsigned long *mask,
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struct xps_dev_maps *dev_maps, unsigned int nr_ids,
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u16 offset, u16 count, bool is_rxqs_map)
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{
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bool active = false;
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int i, j;
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for (j = -1; j = netif_attrmask_next(j, mask, nr_ids),
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j < nr_ids;)
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active |= remove_xps_queue_cpu(dev, dev_maps, j, offset,
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count);
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if (!active) {
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if (is_rxqs_map) {
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RCU_INIT_POINTER(dev->xps_rxqs_map, NULL);
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} else {
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RCU_INIT_POINTER(dev->xps_cpus_map, NULL);
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for (i = offset + (count - 1); count--; i--)
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netdev_queue_numa_node_write(
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netdev_get_tx_queue(dev, i),
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NUMA_NO_NODE);
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}
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kfree_rcu(dev_maps, rcu);
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}
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}
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static void netif_reset_xps_queues(struct net_device *dev, u16 offset,
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u16 count)
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{
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const unsigned long *possible_mask = NULL;
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struct xps_dev_maps *dev_maps;
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int cpu, i;
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bool active = false;
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unsigned int nr_ids;
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mutex_lock(&xps_map_mutex);
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dev_maps = xmap_dereference(dev->xps_maps);
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dev_maps = xmap_dereference(dev->xps_rxqs_map);
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if (dev_maps) {
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nr_ids = dev->num_rx_queues;
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clean_xps_maps(dev, possible_mask, dev_maps, nr_ids, offset,
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count, true);
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}
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dev_maps = xmap_dereference(dev->xps_cpus_map);
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if (!dev_maps)
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goto out_no_maps;
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for_each_possible_cpu(cpu)
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active |= remove_xps_queue_cpu(dev, dev_maps, cpu,
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offset, count);
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if (!active) {
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RCU_INIT_POINTER(dev->xps_maps, NULL);
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kfree_rcu(dev_maps, rcu);
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}
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for (i = offset + (count - 1); count--; i--)
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netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i),
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NUMA_NO_NODE);
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if (num_possible_cpus() > 1)
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possible_mask = cpumask_bits(cpu_possible_mask);
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nr_ids = nr_cpu_ids;
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clean_xps_maps(dev, possible_mask, dev_maps, nr_ids, offset, count,
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false);
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out_no_maps:
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mutex_unlock(&xps_map_mutex);
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@ -2170,8 +2197,8 @@ static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index)
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netif_reset_xps_queues(dev, index, dev->num_tx_queues - index);
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}
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static struct xps_map *expand_xps_map(struct xps_map *map,
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int cpu, u16 index)
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static struct xps_map *expand_xps_map(struct xps_map *map, int attr_index,
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u16 index, bool is_rxqs_map)
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{
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struct xps_map *new_map;
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int alloc_len = XPS_MIN_MAP_ALLOC;
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@ -2183,7 +2210,7 @@ static struct xps_map *expand_xps_map(struct xps_map *map,
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return map;
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}
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/* Need to add queue to this CPU's existing map */
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/* Need to add tx-queue to this CPU's/rx-queue's existing map */
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if (map) {
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if (pos < map->alloc_len)
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return map;
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@ -2191,9 +2218,14 @@ static struct xps_map *expand_xps_map(struct xps_map *map,
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alloc_len = map->alloc_len * 2;
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}
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/* Need to allocate new map to store queue on this CPU's map */
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new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
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cpu_to_node(cpu));
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/* Need to allocate new map to store tx-queue on this CPU's/rx-queue's
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* map
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*/
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if (is_rxqs_map)
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new_map = kzalloc(XPS_MAP_SIZE(alloc_len), GFP_KERNEL);
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else
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new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
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cpu_to_node(attr_index));
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if (!new_map)
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return NULL;
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@ -2205,14 +2237,16 @@ static struct xps_map *expand_xps_map(struct xps_map *map,
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return new_map;
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}
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int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
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u16 index)
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int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
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u16 index, bool is_rxqs_map)
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{
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const unsigned long *online_mask = NULL, *possible_mask = NULL;
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struct xps_dev_maps *dev_maps, *new_dev_maps = NULL;
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int i, cpu, tci, numa_node_id = -2;
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int i, j, tci, numa_node_id = -2;
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int maps_sz, num_tc = 1, tc = 0;
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struct xps_map *map, *new_map;
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bool active = false;
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unsigned int nr_ids;
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if (dev->num_tc) {
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num_tc = dev->num_tc;
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@ -2221,16 +2255,27 @@ int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
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return -EINVAL;
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}
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maps_sz = XPS_DEV_MAPS_SIZE(num_tc);
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mutex_lock(&xps_map_mutex);
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if (is_rxqs_map) {
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maps_sz = XPS_RXQ_DEV_MAPS_SIZE(num_tc, dev->num_rx_queues);
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dev_maps = xmap_dereference(dev->xps_rxqs_map);
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nr_ids = dev->num_rx_queues;
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} else {
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maps_sz = XPS_CPU_DEV_MAPS_SIZE(num_tc);
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if (num_possible_cpus() > 1) {
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online_mask = cpumask_bits(cpu_online_mask);
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possible_mask = cpumask_bits(cpu_possible_mask);
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}
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dev_maps = xmap_dereference(dev->xps_cpus_map);
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nr_ids = nr_cpu_ids;
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}
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if (maps_sz < L1_CACHE_BYTES)
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maps_sz = L1_CACHE_BYTES;
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mutex_lock(&xps_map_mutex);
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dev_maps = xmap_dereference(dev->xps_maps);
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/* allocate memory for queue storage */
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for_each_cpu_and(cpu, cpu_online_mask, mask) {
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for (j = -1; j = netif_attrmask_next_and(j, online_mask, mask, nr_ids),
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j < nr_ids;) {
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if (!new_dev_maps)
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new_dev_maps = kzalloc(maps_sz, GFP_KERNEL);
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if (!new_dev_maps) {
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@ -2238,73 +2283,81 @@ int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
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return -ENOMEM;
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}
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tci = cpu * num_tc + tc;
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map = dev_maps ? xmap_dereference(dev_maps->cpu_map[tci]) :
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tci = j * num_tc + tc;
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map = dev_maps ? xmap_dereference(dev_maps->attr_map[tci]) :
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NULL;
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map = expand_xps_map(map, cpu, index);
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map = expand_xps_map(map, j, index, is_rxqs_map);
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if (!map)
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goto error;
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RCU_INIT_POINTER(new_dev_maps->cpu_map[tci], map);
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RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
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}
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if (!new_dev_maps)
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goto out_no_new_maps;
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for_each_possible_cpu(cpu) {
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for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
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j < nr_ids;) {
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/* copy maps belonging to foreign traffic classes */
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for (i = tc, tci = cpu * num_tc; dev_maps && i--; tci++) {
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for (i = tc, tci = j * num_tc; dev_maps && i--; tci++) {
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/* fill in the new device map from the old device map */
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map = xmap_dereference(dev_maps->cpu_map[tci]);
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RCU_INIT_POINTER(new_dev_maps->cpu_map[tci], map);
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map = xmap_dereference(dev_maps->attr_map[tci]);
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RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
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}
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/* We need to explicitly update tci as prevous loop
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* could break out early if dev_maps is NULL.
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*/
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tci = cpu * num_tc + tc;
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tci = j * num_tc + tc;
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if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) {
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/* add queue to CPU maps */
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if (netif_attr_test_mask(j, mask, nr_ids) &&
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netif_attr_test_online(j, online_mask, nr_ids)) {
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/* add tx-queue to CPU/rx-queue maps */
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int pos = 0;
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map = xmap_dereference(new_dev_maps->cpu_map[tci]);
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map = xmap_dereference(new_dev_maps->attr_map[tci]);
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while ((pos < map->len) && (map->queues[pos] != index))
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pos++;
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if (pos == map->len)
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map->queues[map->len++] = index;
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#ifdef CONFIG_NUMA
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if (numa_node_id == -2)
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numa_node_id = cpu_to_node(cpu);
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else if (numa_node_id != cpu_to_node(cpu))
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numa_node_id = -1;
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if (!is_rxqs_map) {
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if (numa_node_id == -2)
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numa_node_id = cpu_to_node(j);
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else if (numa_node_id != cpu_to_node(j))
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numa_node_id = -1;
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}
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#endif
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} else if (dev_maps) {
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/* fill in the new device map from the old device map */
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map = xmap_dereference(dev_maps->cpu_map[tci]);
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RCU_INIT_POINTER(new_dev_maps->cpu_map[tci], map);
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map = xmap_dereference(dev_maps->attr_map[tci]);
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RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
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}
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/* copy maps belonging to foreign traffic classes */
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for (i = num_tc - tc, tci++; dev_maps && --i; tci++) {
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/* fill in the new device map from the old device map */
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map = xmap_dereference(dev_maps->cpu_map[tci]);
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RCU_INIT_POINTER(new_dev_maps->cpu_map[tci], map);
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map = xmap_dereference(dev_maps->attr_map[tci]);
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RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
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}
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}
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rcu_assign_pointer(dev->xps_maps, new_dev_maps);
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if (is_rxqs_map)
|
||||
rcu_assign_pointer(dev->xps_rxqs_map, new_dev_maps);
|
||||
else
|
||||
rcu_assign_pointer(dev->xps_cpus_map, new_dev_maps);
|
||||
|
||||
/* Cleanup old maps */
|
||||
if (!dev_maps)
|
||||
goto out_no_old_maps;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
for (i = num_tc, tci = cpu * num_tc; i--; tci++) {
|
||||
new_map = xmap_dereference(new_dev_maps->cpu_map[tci]);
|
||||
map = xmap_dereference(dev_maps->cpu_map[tci]);
|
||||
for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
|
||||
j < nr_ids;) {
|
||||
for (i = num_tc, tci = j * num_tc; i--; tci++) {
|
||||
new_map = xmap_dereference(new_dev_maps->attr_map[tci]);
|
||||
map = xmap_dereference(dev_maps->attr_map[tci]);
|
||||
if (map && map != new_map)
|
||||
kfree_rcu(map, rcu);
|
||||
}
|
||||
@ -2317,19 +2370,23 @@ out_no_old_maps:
|
||||
active = true;
|
||||
|
||||
out_no_new_maps:
|
||||
/* update Tx queue numa node */
|
||||
netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
|
||||
(numa_node_id >= 0) ? numa_node_id :
|
||||
NUMA_NO_NODE);
|
||||
if (!is_rxqs_map) {
|
||||
/* update Tx queue numa node */
|
||||
netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
|
||||
(numa_node_id >= 0) ?
|
||||
numa_node_id : NUMA_NO_NODE);
|
||||
}
|
||||
|
||||
if (!dev_maps)
|
||||
goto out_no_maps;
|
||||
|
||||
/* removes queue from unused CPUs */
|
||||
for_each_possible_cpu(cpu) {
|
||||
for (i = tc, tci = cpu * num_tc; i--; tci++)
|
||||
/* removes tx-queue from unused CPUs/rx-queues */
|
||||
for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
|
||||
j < nr_ids;) {
|
||||
for (i = tc, tci = j * num_tc; i--; tci++)
|
||||
active |= remove_xps_queue(dev_maps, tci, index);
|
||||
if (!cpumask_test_cpu(cpu, mask) || !cpu_online(cpu))
|
||||
if (!netif_attr_test_mask(j, mask, nr_ids) ||
|
||||
!netif_attr_test_online(j, online_mask, nr_ids))
|
||||
active |= remove_xps_queue(dev_maps, tci, index);
|
||||
for (i = num_tc - tc, tci++; --i; tci++)
|
||||
active |= remove_xps_queue(dev_maps, tci, index);
|
||||
@ -2337,7 +2394,10 @@ out_no_new_maps:
|
||||
|
||||
/* free map if not active */
|
||||
if (!active) {
|
||||
RCU_INIT_POINTER(dev->xps_maps, NULL);
|
||||
if (is_rxqs_map)
|
||||
RCU_INIT_POINTER(dev->xps_rxqs_map, NULL);
|
||||
else
|
||||
RCU_INIT_POINTER(dev->xps_cpus_map, NULL);
|
||||
kfree_rcu(dev_maps, rcu);
|
||||
}
|
||||
|
||||
@ -2347,11 +2407,12 @@ out_no_maps:
|
||||
return 0;
|
||||
error:
|
||||
/* remove any maps that we added */
|
||||
for_each_possible_cpu(cpu) {
|
||||
for (i = num_tc, tci = cpu * num_tc; i--; tci++) {
|
||||
new_map = xmap_dereference(new_dev_maps->cpu_map[tci]);
|
||||
for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
|
||||
j < nr_ids;) {
|
||||
for (i = num_tc, tci = j * num_tc; i--; tci++) {
|
||||
new_map = xmap_dereference(new_dev_maps->attr_map[tci]);
|
||||
map = dev_maps ?
|
||||
xmap_dereference(dev_maps->cpu_map[tci]) :
|
||||
xmap_dereference(dev_maps->attr_map[tci]) :
|
||||
NULL;
|
||||
if (new_map && new_map != map)
|
||||
kfree(new_map);
|
||||
@ -2363,6 +2424,12 @@ error:
|
||||
kfree(new_dev_maps);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
|
||||
u16 index)
|
||||
{
|
||||
return __netif_set_xps_queue(dev, cpumask_bits(mask), index, false);
|
||||
}
|
||||
EXPORT_SYMBOL(netif_set_xps_queue);
|
||||
|
||||
#endif
|
||||
@ -3384,7 +3451,7 @@ static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
|
||||
int queue_index = -1;
|
||||
|
||||
rcu_read_lock();
|
||||
dev_maps = rcu_dereference(dev->xps_maps);
|
||||
dev_maps = rcu_dereference(dev->xps_cpus_map);
|
||||
if (dev_maps) {
|
||||
unsigned int tci = skb->sender_cpu - 1;
|
||||
|
||||
@ -3393,7 +3460,7 @@ static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
|
||||
tci += netdev_get_prio_tc_map(dev, skb->priority);
|
||||
}
|
||||
|
||||
map = rcu_dereference(dev_maps->cpu_map[tci]);
|
||||
map = rcu_dereference(dev_maps->attr_map[tci]);
|
||||
if (map) {
|
||||
if (map->len == 1)
|
||||
queue_index = map->queues[0];
|
||||
|
||||
@ -1227,13 +1227,13 @@ static ssize_t xps_cpus_show(struct netdev_queue *queue,
|
||||
return -ENOMEM;
|
||||
|
||||
rcu_read_lock();
|
||||
dev_maps = rcu_dereference(dev->xps_maps);
|
||||
dev_maps = rcu_dereference(dev->xps_cpus_map);
|
||||
if (dev_maps) {
|
||||
for_each_possible_cpu(cpu) {
|
||||
int i, tci = cpu * num_tc + tc;
|
||||
struct xps_map *map;
|
||||
|
||||
map = rcu_dereference(dev_maps->cpu_map[tci]);
|
||||
map = rcu_dereference(dev_maps->attr_map[tci]);
|
||||
if (!map)
|
||||
continue;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user