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| author | John Fastabend <john.fastabend@gmail.com> | 2016-12-15 12:12:54 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-12-17 11:48:55 -0500 |
| commit | f23bc46c30ca5ef58b8549434899fcbac41b2cfc (patch) | |
| tree | 390ef0bceeecca2cbad8641150c828fe572565ec | |
| parent | 08abb79542c9e8c367d1d8e44fe1026868d3f0a7 (diff) | |
| download | linux-stable-f23bc46c30ca5ef58b8549434899fcbac41b2cfc.tar.gz linux-stable-f23bc46c30ca5ef58b8549434899fcbac41b2cfc.tar.bz2 linux-stable-f23bc46c30ca5ef58b8549434899fcbac41b2cfc.zip | |
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: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/filter.h | 1 | ||||
| -rw-r--r-- | net/core/filter.c | 6 |
2 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h index 6a1658308612..af8a1804cac6 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -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; diff --git a/net/core/filter.c b/net/core/filter.c index b1461708a977..7190bd648154 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -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, |