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 err = qops->ndo_queue_stop(dev, old_mem, rxq_idx); 42 if (err) 43 goto err_free_new_queue_mem; 44 45 err = qops->ndo_queue_start(dev, new_mem, rxq_idx); 46 if (err) 47 goto err_start_queue; 48 49 qops->ndo_queue_mem_free(dev, old_mem); 50 51 kvfree(old_mem); 52 kvfree(new_mem); 53 54 return 0; 55 56 err_start_queue: 57 /* Restarting the queue with old_mem should be successful as we haven't 58 * changed any of the queue configuration, and there is not much we can 59 * do to recover from a failure here. 60 * 61 * WARN if we fail to recover the old rx queue, and at least free 62 * old_mem so we don't also leak that. 63 */ 64 if (qops->ndo_queue_start(dev, old_mem, rxq_idx)) { 65 WARN(1, 66 "Failed to restart old queue in error path. RX queue %d may be unhealthy.", 67 rxq_idx); 68 qops->ndo_queue_mem_free(dev, old_mem); 69 } 70 71 err_free_new_queue_mem: 72 qops->ndo_queue_mem_free(dev, new_mem); 73 74 err_free_old_mem: 75 kvfree(old_mem); 76 77 err_free_new_mem: 78 kvfree(new_mem); 79 80 return err; 81 } 82 EXPORT_SYMBOL_NS_GPL(netdev_rx_queue_restart, "NETDEV_INTERNAL"); 83 84 static int __net_mp_open_rxq(struct net_device *dev, unsigned ifq_idx, 85 struct pp_memory_provider_params *p) 86 { 87 struct netdev_rx_queue *rxq; 88 int ret; 89 90 if (ifq_idx >= dev->real_num_rx_queues) 91 return -EINVAL; 92 ifq_idx = array_index_nospec(ifq_idx, dev->real_num_rx_queues); 93 94 rxq = __netif_get_rx_queue(dev, ifq_idx); 95 if (rxq->mp_params.mp_ops) 96 return -EEXIST; 97 98 rxq->mp_params = *p; 99 ret = netdev_rx_queue_restart(dev, ifq_idx); 100 if (ret) { 101 rxq->mp_params.mp_ops = NULL; 102 rxq->mp_params.mp_priv = NULL; 103 } 104 return ret; 105 } 106 107 int net_mp_open_rxq(struct net_device *dev, unsigned ifq_idx, 108 struct pp_memory_provider_params *p) 109 { 110 int ret; 111 112 rtnl_lock(); 113 ret = __net_mp_open_rxq(dev, ifq_idx, p); 114 rtnl_unlock(); 115 return ret; 116 } 117 118 static void __net_mp_close_rxq(struct net_device *dev, unsigned ifq_idx, 119 struct pp_memory_provider_params *old_p) 120 { 121 struct netdev_rx_queue *rxq; 122 123 if (WARN_ON_ONCE(ifq_idx >= dev->real_num_rx_queues)) 124 return; 125 126 rxq = __netif_get_rx_queue(dev, ifq_idx); 127 128 /* Callers holding a netdev ref may get here after we already 129 * went thru shutdown via dev_memory_provider_uninstall(). 130 */ 131 if (dev->reg_state > NETREG_REGISTERED && 132 !rxq->mp_params.mp_ops) 133 return; 134 135 if (WARN_ON_ONCE(rxq->mp_params.mp_ops != old_p->mp_ops || 136 rxq->mp_params.mp_priv != old_p->mp_priv)) 137 return; 138 139 rxq->mp_params.mp_ops = NULL; 140 rxq->mp_params.mp_priv = NULL; 141 WARN_ON(netdev_rx_queue_restart(dev, ifq_idx)); 142 } 143 144 void net_mp_close_rxq(struct net_device *dev, unsigned ifq_idx, 145 struct pp_memory_provider_params *old_p) 146 { 147 rtnl_lock(); 148 __net_mp_close_rxq(dev, ifq_idx, old_p); 149 rtnl_unlock(); 150 } 151