c8ed668593
Once we enable -Wall for BPF sources, compiler will complain about lots of unused variables, variables that are set but never read, etc. Fix all these issues first before enabling -Wall in Makefile. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/r/20230309054015.4068562-4-andrii@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_tracing.h>
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#include <bpf/bpf_helpers.h>
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char _license[] SEC("license") = "GPL";
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struct net_device {
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/* Structure does not need to contain all entries,
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* as "preserve_access_index" will use BTF to fix this...
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*/
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int ifindex;
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} __attribute__((preserve_access_index));
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struct xdp_rxq_info {
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/* Structure does not need to contain all entries,
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* as "preserve_access_index" will use BTF to fix this...
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*/
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struct net_device *dev;
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__u32 queue_index;
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} __attribute__((preserve_access_index));
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struct xdp_buff {
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void *data;
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void *data_end;
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void *data_meta;
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void *data_hard_start;
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unsigned long handle;
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struct xdp_rxq_info *rxq;
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} __attribute__((preserve_access_index));
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struct meta {
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int ifindex;
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int pkt_len;
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};
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struct {
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__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
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__type(key, int);
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__type(value, int);
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} perf_buf_map SEC(".maps");
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__u64 test_result_fentry = 0;
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SEC("fentry/FUNC")
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int BPF_PROG(trace_on_entry, struct xdp_buff *xdp)
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{
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struct meta meta;
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meta.ifindex = xdp->rxq->dev->ifindex;
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meta.pkt_len = bpf_xdp_get_buff_len((struct xdp_md *)xdp);
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bpf_xdp_output(xdp, &perf_buf_map,
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((__u64) meta.pkt_len << 32) |
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BPF_F_CURRENT_CPU,
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&meta, sizeof(meta));
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test_result_fentry = xdp->rxq->dev->ifindex;
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return 0;
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}
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__u64 test_result_fexit = 0;
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SEC("fexit/FUNC")
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int BPF_PROG(trace_on_exit, struct xdp_buff *xdp, int ret)
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{
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test_result_fexit = ret;
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return 0;
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}
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