Commit f23bc46c authored by John Fastabend's avatar John Fastabend Committed by David S. Miller
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net: xdp: add invalid buffer warning

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: default avatarJohn Fastabend <>
Signed-off-by: default avatarDavid S. Miller <>
parent 08abb795
......@@ -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);
extern int bpf_jit_enable;
......@@ -2972,6 +2972,12 @@ void bpf_warn_invalid_xdp_action(u32 act)
void bpf_warn_invalid_xdp_buffer(void)
WARN_ONCE(1, "Illegal XDP buffer encountered, expect throughput degradation\n");
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,
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