1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2020, Intel Corporation. */ 3 4 #include <linux/if_vlan.h> 5 #include <net/xdp_sock_drv.h> 6 7 #include "igc.h" 8 #include "igc_xdp.h" 9 10 int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog, 11 struct netlink_ext_ack *extack) 12 { 13 struct net_device *dev = adapter->netdev; 14 bool if_running = netif_running(dev); 15 struct bpf_prog *old_prog; 16 17 if (dev->mtu > ETH_DATA_LEN) { 18 /* For now, the driver doesn't support XDP functionality with 19 * jumbo frames so we return error. 20 */ 21 NL_SET_ERR_MSG_MOD(extack, "Jumbo frames not supported"); 22 return -EOPNOTSUPP; 23 } 24 25 if (if_running) 26 igc_close(dev); 27 28 old_prog = xchg(&adapter->xdp_prog, prog); 29 if (old_prog) 30 bpf_prog_put(old_prog); 31 32 if (if_running) 33 igc_open(dev); 34 35 return 0; 36 } 37 38 static int igc_xdp_enable_pool(struct igc_adapter *adapter, 39 struct xsk_buff_pool *pool, u16 queue_id) 40 { 41 struct net_device *ndev = adapter->netdev; 42 struct device *dev = &adapter->pdev->dev; 43 struct igc_ring *rx_ring, *tx_ring; 44 struct napi_struct *napi; 45 bool needs_reset; 46 u32 frame_size; 47 int err; 48 49 if (queue_id >= adapter->num_rx_queues || 50 queue_id >= adapter->num_tx_queues) 51 return -EINVAL; 52 53 frame_size = xsk_pool_get_rx_frame_size(pool); 54 if (frame_size < ETH_FRAME_LEN + VLAN_HLEN * 2) { 55 /* When XDP is enabled, the driver doesn't support frames that 56 * span over multiple buffers. To avoid that, we check if xsk 57 * frame size is big enough to fit the max ethernet frame size 58 * + vlan double tagging. 59 */ 60 return -EOPNOTSUPP; 61 } 62 63 err = xsk_pool_dma_map(pool, dev, IGC_RX_DMA_ATTR); 64 if (err) { 65 netdev_err(ndev, "Failed to map xsk pool\n"); 66 return err; 67 } 68 69 needs_reset = netif_running(adapter->netdev) && igc_xdp_is_enabled(adapter); 70 71 rx_ring = adapter->rx_ring[queue_id]; 72 tx_ring = adapter->tx_ring[queue_id]; 73 /* Rx and Tx rings share the same napi context. */ 74 napi = &rx_ring->q_vector->napi; 75 76 if (needs_reset) { 77 igc_disable_rx_ring(rx_ring); 78 igc_disable_tx_ring(tx_ring); 79 napi_disable(napi); 80 } 81 82 set_bit(IGC_RING_FLAG_AF_XDP_ZC, &rx_ring->flags); 83 set_bit(IGC_RING_FLAG_AF_XDP_ZC, &tx_ring->flags); 84 85 if (needs_reset) { 86 napi_enable(napi); 87 igc_enable_rx_ring(rx_ring); 88 igc_enable_tx_ring(tx_ring); 89 90 err = igc_xsk_wakeup(ndev, queue_id, XDP_WAKEUP_RX); 91 if (err) { 92 xsk_pool_dma_unmap(pool, IGC_RX_DMA_ATTR); 93 return err; 94 } 95 } 96 97 return 0; 98 } 99 100 static int igc_xdp_disable_pool(struct igc_adapter *adapter, u16 queue_id) 101 { 102 struct igc_ring *rx_ring, *tx_ring; 103 struct xsk_buff_pool *pool; 104 struct napi_struct *napi; 105 bool needs_reset; 106 107 if (queue_id >= adapter->num_rx_queues || 108 queue_id >= adapter->num_tx_queues) 109 return -EINVAL; 110 111 pool = xsk_get_pool_from_qid(adapter->netdev, queue_id); 112 if (!pool) 113 return -EINVAL; 114 115 needs_reset = netif_running(adapter->netdev) && igc_xdp_is_enabled(adapter); 116 117 rx_ring = adapter->rx_ring[queue_id]; 118 tx_ring = adapter->tx_ring[queue_id]; 119 /* Rx and Tx rings share the same napi context. */ 120 napi = &rx_ring->q_vector->napi; 121 122 if (needs_reset) { 123 igc_disable_rx_ring(rx_ring); 124 igc_disable_tx_ring(tx_ring); 125 napi_disable(napi); 126 } 127 128 xsk_pool_dma_unmap(pool, IGC_RX_DMA_ATTR); 129 clear_bit(IGC_RING_FLAG_AF_XDP_ZC, &rx_ring->flags); 130 clear_bit(IGC_RING_FLAG_AF_XDP_ZC, &tx_ring->flags); 131 132 if (needs_reset) { 133 napi_enable(napi); 134 igc_enable_rx_ring(rx_ring); 135 igc_enable_tx_ring(tx_ring); 136 } 137 138 return 0; 139 } 140 141 int igc_xdp_setup_pool(struct igc_adapter *adapter, struct xsk_buff_pool *pool, 142 u16 queue_id) 143 { 144 return pool ? igc_xdp_enable_pool(adapter, pool, queue_id) : 145 igc_xdp_disable_pool(adapter, queue_id); 146 } 147