1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
2 | /* |
3 | * if_xdp: XDP socket user-space interface |
4 | * Copyright(c) 2018 Intel Corporation. |
5 | * |
6 | * Author(s): Björn Töpel <bjorn.topel@intel.com> |
7 | * Magnus Karlsson <magnus.karlsson@intel.com> |
8 | */ |
9 | |
10 | #ifndef _LINUX_IF_XDP_H |
11 | #define _LINUX_IF_XDP_H |
12 | |
13 | #include <linux/types.h> |
14 | |
15 | /* Options for the sxdp_flags field */ |
16 | #define XDP_SHARED_UMEM (1 << 0) |
17 | #define XDP_COPY (1 << 1) /* Force copy-mode */ |
18 | #define XDP_ZEROCOPY (1 << 2) /* Force zero-copy mode */ |
19 | /* If this option is set, the driver might go sleep and in that case |
20 | * the XDP_RING_NEED_WAKEUP flag in the fill and/or Tx rings will be |
21 | * set. If it is set, the application need to explicitly wake up the |
22 | * driver with a poll() (Rx and Tx) or sendto() (Tx only). If you are |
23 | * running the driver and the application on the same core, you should |
24 | * use this option so that the kernel will yield to the user space |
25 | * application. |
26 | */ |
27 | #define XDP_USE_NEED_WAKEUP (1 << 3) |
28 | /* By setting this option, userspace application indicates that it can |
29 | * handle multiple descriptors per packet thus enabling AF_XDP to split |
30 | * multi-buffer XDP frames into multiple Rx descriptors. Without this set |
31 | * such frames will be dropped. |
32 | */ |
33 | #define XDP_USE_SG (1 << 4) |
34 | |
35 | /* Flags for xsk_umem_config flags */ |
36 | #define XDP_UMEM_UNALIGNED_CHUNK_FLAG (1 << 0) |
37 | |
38 | struct sockaddr_xdp { |
39 | __u16 sxdp_family; |
40 | __u16 sxdp_flags; |
41 | __u32 sxdp_ifindex; |
42 | __u32 sxdp_queue_id; |
43 | __u32 sxdp_shared_umem_fd; |
44 | }; |
45 | |
46 | /* XDP_RING flags */ |
47 | #define XDP_RING_NEED_WAKEUP (1 << 0) |
48 | |
49 | struct xdp_ring_offset { |
50 | __u64 producer; |
51 | __u64 consumer; |
52 | __u64 desc; |
53 | __u64 flags; |
54 | }; |
55 | |
56 | struct xdp_mmap_offsets { |
57 | struct xdp_ring_offset rx; |
58 | struct xdp_ring_offset tx; |
59 | struct xdp_ring_offset fr; /* Fill */ |
60 | struct xdp_ring_offset cr; /* Completion */ |
61 | }; |
62 | |
63 | /* XDP socket options */ |
64 | #define XDP_MMAP_OFFSETS 1 |
65 | #define XDP_RX_RING 2 |
66 | #define XDP_TX_RING 3 |
67 | #define XDP_UMEM_REG 4 |
68 | #define XDP_UMEM_FILL_RING 5 |
69 | #define XDP_UMEM_COMPLETION_RING 6 |
70 | #define XDP_STATISTICS 7 |
71 | #define XDP_OPTIONS 8 |
72 | |
73 | struct xdp_umem_reg { |
74 | __u64 addr; /* Start of packet data area */ |
75 | __u64 len; /* Length of packet data area */ |
76 | __u32 chunk_size; |
77 | __u32 headroom; |
78 | __u32 flags; |
79 | }; |
80 | |
81 | struct xdp_statistics { |
82 | __u64 rx_dropped; /* Dropped for other reasons */ |
83 | __u64 rx_invalid_descs; /* Dropped due to invalid descriptor */ |
84 | __u64 tx_invalid_descs; /* Dropped due to invalid descriptor */ |
85 | __u64 rx_ring_full; /* Dropped due to rx ring being full */ |
86 | __u64 rx_fill_ring_empty_descs; /* Failed to retrieve item from fill ring */ |
87 | __u64 tx_ring_empty_descs; /* Failed to retrieve item from tx ring */ |
88 | }; |
89 | |
90 | struct xdp_options { |
91 | __u32 flags; |
92 | }; |
93 | |
94 | /* Flags for the flags field of struct xdp_options */ |
95 | #define XDP_OPTIONS_ZEROCOPY (1 << 0) |
96 | |
97 | /* Pgoff for mmaping the rings */ |
98 | #define XDP_PGOFF_RX_RING 0 |
99 | #define XDP_PGOFF_TX_RING 0x80000000 |
100 | #define XDP_UMEM_PGOFF_FILL_RING 0x100000000ULL |
101 | #define XDP_UMEM_PGOFF_COMPLETION_RING 0x180000000ULL |
102 | |
103 | /* Masks for unaligned chunks mode */ |
104 | #define XSK_UNALIGNED_BUF_OFFSET_SHIFT 48 |
105 | #define XSK_UNALIGNED_BUF_ADDR_MASK \ |
106 | ((1ULL << XSK_UNALIGNED_BUF_OFFSET_SHIFT) - 1) |
107 | |
108 | /* Rx/Tx descriptor */ |
109 | struct xdp_desc { |
110 | __u64 addr; |
111 | __u32 len; |
112 | __u32 options; |
113 | }; |
114 | |
115 | /* UMEM descriptor is __u64 */ |
116 | |
117 | /* Flag indicating that the packet continues with the buffer pointed out by the |
118 | * next frame in the ring. The end of the packet is signalled by setting this |
119 | * bit to zero. For single buffer packets, every descriptor has 'options' set |
120 | * to 0 and this maintains backward compatibility. |
121 | */ |
122 | #define XDP_PKT_CONTD (1 << 0) |
123 | |
124 | #endif /* _LINUX_IF_XDP_H */ |
125 | |