1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 #include <linux/netdevice.h> 4 #include <net/netdev_queues.h> 5 #include <net/netdev_rx_queue.h> 6 #include <net/page_pool/memory_provider.h> 7 8 #include "page_pool_priv.h" 9 10 int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq_idx) 11 { 12 struct netdev_rx_queue *rxq = __netif_get_rx_queue(dev, rxq_idx); 13 const struct netdev_queue_mgmt_ops *qops = dev->queue_mgmt_ops; 14 void *new_mem, *old_mem; 15 int err; 16 17 if (!qops || !qops->ndo_queue_stop || !qops->ndo_queue_mem_free || 18 !qops->ndo_queue_mem_alloc || !qops->ndo_queue_start) 19 return -EOPNOTSUPP; 20 21 ASSERT_RTNL(); 22 23 new_mem = kvzalloc(qops->ndo_queue_mem_size, GFP_KERNEL); 24 if (!new_mem) 25 return -ENOMEM; 26 27 old_mem = kvzalloc(qops->ndo_queue_mem_size, GFP_KERNEL); 28 if (!old_mem) { 29 err = -ENOMEM; 30 goto err_free_new_mem; 31 } 32 33 err = qops->ndo_queue_mem_alloc(dev, new_mem, rxq_idx); 34 if (err) 35 goto err_free_old_mem; 36 37 err = page_pool_check_memory_provider(dev, rxq); 38 if (err) 39 goto err_free_new_queue_mem; 40 41 if (netif_running(dev)) { 42 err = qops->ndo_queue_stop(dev, old_mem, rxq_idx); 43 if (err) 44 goto err_free_new_queue_mem; 45 46 err = qops->ndo_queue_start(dev, new_mem, rxq_idx); 47 if (err) 48 goto err_start_queue; 49 } else { 50 swap(new_mem, old_mem); 51 } 52 53 qops->ndo_queue_mem_free(dev, old_mem); 54 55 kvfree(old_mem); 56 kvfree(new_mem); 57 58 return 0; 59 60 err_start_queue: 61 /* Restarting the queue with old_mem should be successful as we haven't 62 * changed any of the queue configuration, and there is not much we can 63 * do to recover from a failure here. 64 * 65 * WARN if we fail to recover the old rx queue, and at least free 66 * old_mem so we don't also leak that. 67 */ 68 if (qops->ndo_queue_start(dev, old_mem, rxq_idx)) { 69 WARN(1, 70 "Failed to restart old queue in error path. RX queue %d may be unhealthy.", 71 rxq_idx); 72 qops->ndo_queue_mem_free(dev, old_mem); 73 } 74 75 err_free_new_queue_mem: 76 qops->ndo_queue_mem_free(dev, new_mem); 77 78 err_free_old_mem: 79 kvfree(old_mem); 80 81 err_free_new_mem: 82 kvfree(new_mem); 83 84 return err; 85 } 86 EXPORT_SYMBOL_NS_GPL(netdev_rx_queue_restart, "NETDEV_INTERNAL"); 87 88 static int __net_mp_open_rxq(struct net_device *dev, unsigned ifq_idx, 89 struct pp_memory_provider_params *p) 90 { 91 struct netdev_rx_queue *rxq; 92 int ret; 93 94 if (ifq_idx >= dev->real_num_rx_queues) 95 return -EINVAL; 96 ifq_idx = array_index_nospec(ifq_idx, dev->real_num_rx_queues); 97 98 rxq = __netif_get_rx_queue(dev, ifq_idx); 99 if (rxq->mp_params.mp_ops) 100 return -EEXIST; 101 102 rxq->mp_params = *p; 103 ret = netdev_rx_queue_restart(dev, ifq_idx); 104 if (ret) { 105 rxq->mp_params.mp_ops = NULL; 106 rxq->mp_params.mp_priv = NULL; 107 } 108 return ret; 109 } 110 111 int net_mp_open_rxq(struct net_device *dev, unsigned ifq_idx, 112 struct pp_memory_provider_params *p) 113 { 114 int ret; 115 116 rtnl_lock(); 117 ret = __net_mp_open_rxq(dev, ifq_idx, p); 118 rtnl_unlock(); 119 return ret; 120 } 121 122 static void __net_mp_close_rxq(struct net_device *dev, unsigned ifq_idx, 123 struct pp_memory_provider_params *old_p) 124 { 125 struct netdev_rx_queue *rxq; 126 127 if (WARN_ON_ONCE(ifq_idx >= dev->real_num_rx_queues)) 128 return; 129 130 rxq = __netif_get_rx_queue(dev, ifq_idx); 131 132 /* Callers holding a netdev ref may get here after we already 133 * went thru shutdown via dev_memory_provider_uninstall(). 134 */ 135 if (dev->reg_state > NETREG_REGISTERED && 136 !rxq->mp_params.mp_ops) 137 return; 138 139 if (WARN_ON_ONCE(rxq->mp_params.mp_ops != old_p->mp_ops || 140 rxq->mp_params.mp_priv != old_p->mp_priv)) 141 return; 142 143 rxq->mp_params.mp_ops = NULL; 144 rxq->mp_params.mp_priv = NULL; 145 WARN_ON(netdev_rx_queue_restart(dev, ifq_idx)); 146 } 147 148 void net_mp_close_rxq(struct net_device *dev, unsigned ifq_idx, 149 struct pp_memory_provider_params *old_p) 150 { 151 rtnl_lock(); 152 __net_mp_close_rxq(dev, ifq_idx, old_p); 153 rtnl_unlock(); 154 } 155