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net: xdp: add invalid buffer warning

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This adds a warning for drivers to use when encountering an invalid
buffer for XDP. For normal cases this should not happen but to catch
this in virtual/qemu setups that I may not have expected from the
emulation layer having a standard warning is useful.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend 2016-12-15 12:12:54 -08:00 committed by David S. Miller
parent 08abb79542
commit f23bc46c30
2 changed files with 7 additions and 0 deletions
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1
include/linux/filter.h
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@ -602,6 +602,7 @@ bool bpf_helper_changes_pkt_data(void *func);
struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
const struct bpf_insn *patch, u32 len);
void bpf_warn_invalid_xdp_action(u32 act);
void bpf_warn_invalid_xdp_buffer(void);
#ifdef CONFIG_BPF_JIT
extern int bpf_jit_enable;

6
net/core/filter.c
View file

@ -2972,6 +2972,12 @@ void bpf_warn_invalid_xdp_action(u32 act)
}
EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
void bpf_warn_invalid_xdp_buffer(void)
{
WARN_ONCE(1, "Illegal XDP buffer encountered, expect throughput degradation\n");
}
EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_buffer);
static u32 sk_filter_convert_ctx_access(enum bpf_access_type type, int dst_reg,
int src_reg, int ctx_off,
struct bpf_insn *insn_buf,