1 /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ 2 /* 3 * Copyright 2015-2021 Amazon.com, Inc. or its affiliates. All rights reserved. 4 */ 5 6 #ifndef ENA_XDP_H 7 #define ENA_XDP_H 8 9 #include "ena_netdev.h" 10 #include <linux/bpf_trace.h> 11 12 /* The max MTU size is configured to be the ethernet frame size without 13 * the overhead of the ethernet header, which can have a VLAN header, and 14 * a frame check sequence (FCS). 15 * The buffer size we share with the device is defined to be ENA_PAGE_SIZE 16 */ 17 #define ENA_XDP_MAX_MTU (ENA_PAGE_SIZE - ETH_HLEN - ETH_FCS_LEN - \ 18 VLAN_HLEN - XDP_PACKET_HEADROOM - \ 19 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) 20 21 #define ENA_IS_XDP_INDEX(adapter, index) (((index) >= (adapter)->xdp_first_ring) && \ 22 ((index) < (adapter)->xdp_first_ring + (adapter)->xdp_num_queues)) 23 24 enum ENA_XDP_ACTIONS { 25 ENA_XDP_PASS = 0, 26 ENA_XDP_TX = BIT(0), 27 ENA_XDP_REDIRECT = BIT(1), 28 ENA_XDP_DROP = BIT(2) 29 }; 30 31 #define ENA_XDP_FORWARDED (ENA_XDP_TX | ENA_XDP_REDIRECT) 32 33 int ena_setup_and_create_all_xdp_queues(struct ena_adapter *adapter); 34 void ena_xdp_exchange_program_rx_in_range(struct ena_adapter *adapter, 35 struct bpf_prog *prog, 36 int first, int count); 37 int ena_xdp_io_poll(struct napi_struct *napi, int budget); 38 int ena_xdp_xmit_frame(struct ena_ring *tx_ring, 39 struct ena_adapter *adapter, 40 struct xdp_frame *xdpf, 41 int flags); 42 int ena_xdp_xmit(struct net_device *dev, int n, 43 struct xdp_frame **frames, u32 flags); 44 int ena_xdp(struct net_device *netdev, struct netdev_bpf *bpf); 45 46 enum ena_xdp_errors_t { 47 ENA_XDP_ALLOWED = 0, 48 ENA_XDP_CURRENT_MTU_TOO_LARGE, 49 ENA_XDP_NO_ENOUGH_QUEUES, 50 }; 51 52 static inline bool ena_xdp_present(struct ena_adapter *adapter) 53 { 54 return !!adapter->xdp_bpf_prog; 55 } 56 57 static inline bool ena_xdp_present_ring(struct ena_ring *ring) 58 { 59 return !!ring->xdp_bpf_prog; 60 } 61 62 static inline bool ena_xdp_legal_queue_count(struct ena_adapter *adapter, 63 u32 queues) 64 { 65 return 2 * queues <= adapter->max_num_io_queues; 66 } 67 68 static inline enum ena_xdp_errors_t ena_xdp_allowed(struct ena_adapter *adapter) 69 { 70 enum ena_xdp_errors_t rc = ENA_XDP_ALLOWED; 71 72 if (adapter->netdev->mtu > ENA_XDP_MAX_MTU) 73 rc = ENA_XDP_CURRENT_MTU_TOO_LARGE; 74 else if (!ena_xdp_legal_queue_count(adapter, adapter->num_io_queues)) 75 rc = ENA_XDP_NO_ENOUGH_QUEUES; 76 77 return rc; 78 } 79 80 static inline int ena_xdp_execute(struct ena_ring *rx_ring, struct xdp_buff *xdp) 81 { 82 u32 verdict = ENA_XDP_PASS; 83 struct bpf_prog *xdp_prog; 84 struct ena_ring *xdp_ring; 85 struct xdp_frame *xdpf; 86 u64 *xdp_stat; 87 88 xdp_prog = READ_ONCE(rx_ring->xdp_bpf_prog); 89 90 if (!xdp_prog) 91 return verdict; 92 93 verdict = bpf_prog_run_xdp(xdp_prog, xdp); 94 95 switch (verdict) { 96 case XDP_TX: 97 xdpf = xdp_convert_buff_to_frame(xdp); 98 if (unlikely(!xdpf)) { 99 trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict); 100 xdp_stat = &rx_ring->rx_stats.xdp_aborted; 101 verdict = ENA_XDP_DROP; 102 break; 103 } 104 105 /* Find xmit queue */ 106 xdp_ring = rx_ring->xdp_ring; 107 108 /* The XDP queues are shared between XDP_TX and XDP_REDIRECT */ 109 spin_lock(&xdp_ring->xdp_tx_lock); 110 111 if (ena_xdp_xmit_frame(xdp_ring, rx_ring->adapter, xdpf, 112 XDP_XMIT_FLUSH)) 113 xdp_return_frame(xdpf); 114 115 spin_unlock(&xdp_ring->xdp_tx_lock); 116 xdp_stat = &rx_ring->rx_stats.xdp_tx; 117 verdict = ENA_XDP_TX; 118 break; 119 case XDP_REDIRECT: 120 if (likely(!xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog))) { 121 xdp_stat = &rx_ring->rx_stats.xdp_redirect; 122 verdict = ENA_XDP_REDIRECT; 123 break; 124 } 125 trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict); 126 xdp_stat = &rx_ring->rx_stats.xdp_aborted; 127 verdict = ENA_XDP_DROP; 128 break; 129 case XDP_ABORTED: 130 trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict); 131 xdp_stat = &rx_ring->rx_stats.xdp_aborted; 132 verdict = ENA_XDP_DROP; 133 break; 134 case XDP_DROP: 135 xdp_stat = &rx_ring->rx_stats.xdp_drop; 136 verdict = ENA_XDP_DROP; 137 break; 138 case XDP_PASS: 139 xdp_stat = &rx_ring->rx_stats.xdp_pass; 140 verdict = ENA_XDP_PASS; 141 break; 142 default: 143 bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, verdict); 144 xdp_stat = &rx_ring->rx_stats.xdp_invalid; 145 verdict = ENA_XDP_DROP; 146 } 147 148 ena_increase_stat(xdp_stat, 1, &rx_ring->syncp); 149 150 return verdict; 151 } 152 #endif /* ENA_XDP_H */ 153