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AF_XDP: add xsk.{c,h} to Makefile and fix build
This patch makes sure we build AF_XDP-related code as part of libbpf. This also required copying few uapi/linux headers and adding few used definitions in include headers. Signed-off-by: Andrii Nakryiko <andriin@fb.com>
This commit is contained in:
Andrii Nakryiko
Andrii Nakryiko
parent
7a431904c8
commit
cb658e9724
7
include/asm/barrier.h
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7
include/asm/barrier.h
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@ -0,0 +1,7 @@
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/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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#ifndef __ASM_BARRIER_H
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#define __ASM_BARRIER_H
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#include <linux/compiler.h>
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#endif
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52
include/linux/compiler.h
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52
include/linux/compiler.h
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@ -0,0 +1,52 @@
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/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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#ifndef __LINUX_COMPILER_H
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#define __LINUX_COMPILER_H
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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#define READ_ONCE(x) (*(volatile typeof(x) *)&x)
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#define WRITE_ONCE(x, v) (*(volatile typeof(x) *)&x) = (v)
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#define barrier() asm volatile("" ::: "memory")
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#if defined(__x86_64__)
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# define smp_rmb() asm volatile("lfence" ::: "memory")
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# define smp_wmb() asm volatile("sfence" ::: "memory")
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# define smp_store_release(p, v) \
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do { \
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barrier(); \
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WRITE_ONCE(*p, v); \
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} while (0)
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# define smp_load_acquire(p) \
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({ \
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typeof(*p) ___p = READ_ONCE(*p); \
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barrier(); \
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___p; \
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})
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#else
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# define smp_mb() __sync_synchronize()
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# define smp_rmb() smp_mb()
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# define smp_wmb() smp_mb()
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# define smp_store_release(p, v) \
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do { \
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smp_mb(); \
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WRITE_ONCE(*p, v); \
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} while (0)
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# define smp_load_acquire(p) \
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({ \
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typeof(*p) ___p = READ_ONCE(*p); \
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smp_mb(); \
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___p; \
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})
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#endif /* defined(__x86_64__) */
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#endif
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@ -5,6 +5,14 @@
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#include <linux/bpf.h>
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#define BPF_ALU64_IMM(OP, DST, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = 0, \
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.imm = IMM })
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#define BPF_MOV64_IMM(DST, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU64 | BPF_MOV | BPF_K, \
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@ -29,4 +37,62 @@
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.off = 0, \
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.imm = ((FUNC) - BPF_FUNC_unspec) })
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#define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
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((struct bpf_insn) { \
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.code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = OFF, \
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.imm = 0 })
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#define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
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((struct bpf_insn) { \
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.code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = OFF, \
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.imm = 0 })
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#define BPF_MOV64_REG(DST, SRC) \
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((struct bpf_insn) { \
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.code = BPF_ALU64 | BPF_MOV | BPF_X, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = 0 })
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#define BPF_MOV32_IMM(DST, IMM) \
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((struct bpf_insn) { \
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.code = BPF_ALU | BPF_MOV | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = 0, \
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.imm = IMM })
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#define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
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((struct bpf_insn) { \
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.code = BPF_LD | BPF_DW | BPF_IMM, \
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.dst_reg = DST, \
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.src_reg = SRC, \
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.off = 0, \
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.imm = (__u32) (IMM) }), \
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((struct bpf_insn) { \
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.code = 0, \
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.dst_reg = 0, \
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.src_reg = 0, \
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.off = 0, \
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.imm = ((__u64) (IMM)) >> 32 })
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#define BPF_LD_MAP_FD(DST, MAP_FD) \
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BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
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#define BPF_JMP_IMM(OP, DST, IMM, OFF) \
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((struct bpf_insn) { \
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.code = BPF_JMP | BPF_OP(OP) | BPF_K, \
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.dst_reg = DST, \
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.src_reg = 0, \
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.off = OFF, \
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.imm = IMM })
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#endif
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@ -39,5 +39,6 @@
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#endif
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
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#define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
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#endif
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@ -2,40 +2,7 @@
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#ifndef _TOOLS_LINUX_RING_BUFFER_H_
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#define _TOOLS_LINUX_RING_BUFFER_H_
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#define READ_ONCE(x) (*(volatile typeof(x) *)&x)
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#define WRITE_ONCE(x, v) (*(volatile typeof(x) *)&x) = (v)
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#define barrier() asm volatile("" ::: "memory")
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#if defined(__x86_64__)
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# define smp_store_release(p, v) \
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do { \
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barrier(); \
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WRITE_ONCE(*p, v); \
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} while (0)
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# define smp_load_acquire(p) \
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({ \
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typeof(*p) ___p = READ_ONCE(*p); \
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barrier(); \
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___p; \
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})
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#else
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# define smp_mb() __sync_synchronize()
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# define smp_store_release(p, v) \
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do { \
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smp_mb(); \
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WRITE_ONCE(*p, v); \
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} while (0)
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# define smp_load_acquire(p) \
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({ \
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typeof(*p) ___p = READ_ONCE(*p); \
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smp_mb(); \
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___p; \
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})
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#endif /* defined(__x86_64__) */
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#include <linux/compiler.h>
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static inline __u64 ring_buffer_read_head(struct perf_event_mmap_page *base)
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{
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78
include/uapi/linux/if_xdp.h
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78
include/uapi/linux/if_xdp.h
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@ -0,0 +1,78 @@
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* if_xdp: XDP socket user-space interface
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* Copyright(c) 2018 Intel Corporation.
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*
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* Author(s): Björn Töpel <bjorn.topel@intel.com>
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* Magnus Karlsson <magnus.karlsson@intel.com>
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*/
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#ifndef _LINUX_IF_XDP_H
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#define _LINUX_IF_XDP_H
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#include <linux/types.h>
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/* Options for the sxdp_flags field */
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#define XDP_SHARED_UMEM (1 << 0)
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#define XDP_COPY (1 << 1) /* Force copy-mode */
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#define XDP_ZEROCOPY (1 << 2) /* Force zero-copy mode */
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struct sockaddr_xdp {
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__u16 sxdp_family;
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__u16 sxdp_flags;
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__u32 sxdp_ifindex;
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__u32 sxdp_queue_id;
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__u32 sxdp_shared_umem_fd;
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};
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struct xdp_ring_offset {
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__u64 producer;
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__u64 consumer;
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__u64 desc;
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};
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struct xdp_mmap_offsets {
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struct xdp_ring_offset rx;
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struct xdp_ring_offset tx;
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struct xdp_ring_offset fr; /* Fill */
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struct xdp_ring_offset cr; /* Completion */
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};
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/* XDP socket options */
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#define XDP_MMAP_OFFSETS 1
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#define XDP_RX_RING 2
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#define XDP_TX_RING 3
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#define XDP_UMEM_REG 4
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#define XDP_UMEM_FILL_RING 5
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#define XDP_UMEM_COMPLETION_RING 6
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#define XDP_STATISTICS 7
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struct xdp_umem_reg {
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__u64 addr; /* Start of packet data area */
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__u64 len; /* Length of packet data area */
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__u32 chunk_size;
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__u32 headroom;
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};
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struct xdp_statistics {
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__u64 rx_dropped; /* Dropped for reasons other than invalid desc */
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__u64 rx_invalid_descs; /* Dropped due to invalid descriptor */
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__u64 tx_invalid_descs; /* Dropped due to invalid descriptor */
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};
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/* Pgoff for mmaping the rings */
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#define XDP_PGOFF_RX_RING 0
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#define XDP_PGOFF_TX_RING 0x80000000
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#define XDP_UMEM_PGOFF_FILL_RING 0x100000000ULL
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#define XDP_UMEM_PGOFF_COMPLETION_RING 0x180000000ULL
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/* Rx/Tx descriptor */
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struct xdp_desc {
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__u64 addr;
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__u32 len;
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__u32 options;
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};
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/* UMEM descriptor is __u64 */
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#endif /* _LINUX_IF_XDP_H */
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2
src/.gitignore
vendored
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2
src/.gitignore
vendored
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@ -0,0 +1,2 @@
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*.o
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*.a
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@ -20,7 +20,7 @@ ALL_CFLAGS += $(CFLAGS)
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OBJDIR ?= .
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OBJS := $(addprefix $(OBJDIR)/,bpf.o btf.o libbpf.o libbpf_errno.o netlink.o \
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nlattr.o str_error.o libbpf_probes.o)
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nlattr.o str_error.o libbpf_probes.o bpf_prog_linfo.o xsk.o)
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LIBS := $(OBJDIR)/libbpf.a
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ifdef BUILD_SHARED
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