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Commit f23bc46c authored by John Fastabend's avatar John Fastabend Committed by David S. Miller
Browse files

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 <john.r.fastabend@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 08abb795

include/linux/filter.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

net/core/filter.c

+6 −0
Original line number Diff line number Diff line
@@ -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,