38 	int delta = 0;  in xdp_use_helper()  local
44 	if (bpf_check_mtu(ctx, ifindex, &mtu_len, delta, 0)) {  in xdp_use_helper()
67 	int delta;  in xdp_exceed_mtu()  local
70 	/* Exceed MTU with 1 via delta adjust */  in xdp_exceed_mtu()
71 	delta = GLOBAL_USER_MTU - (data_len - ETH_HLEN) + 1;  in xdp_exceed_mtu()
73 	err = bpf_check_mtu(ctx, ifindex, &mtu_len, delta, 0);  in xdp_exceed_mtu()
93 	int delta;  in xdp_minus_delta()  local
95 	/* Borderline test case: Minus delta exceeding packet length allowed */  in xdp_minus_delta()
96 	delta = -((data_len - ETH_HLEN) + 1);  in xdp_minus_delta()
98 	/* Minus length (adjusted via delta) still pass MTU check, other helpers  in xdp_minus_delta()
101 	if (bpf_check_mtu(ctx, ifindex, &mtu_len, delta, 0))  in xdp_minus_delta()
161 	int delta = 0;  in tc_use_helper()  local
163 	if (bpf_check_mtu(ctx, 0, &mtu_len, delta, 0)) {  in tc_use_helper()
182 	int delta;  in tc_exceed_mtu()  local
185 	/* Exceed MTU with 1 via delta adjust */  in tc_exceed_mtu()
186 	delta = GLOBAL_USER_MTU - (skb_len - ETH_HLEN) + 1;  in tc_exceed_mtu()
188 	err = bpf_check_mtu(ctx, ifindex, &mtu_len, delta, 0);  in tc_exceed_mtu()
209 	int delta;  in tc_exceed_mtu_da()  local
212 	/* Exceed MTU with 1 via delta adjust */  in tc_exceed_mtu_da()
213 	delta = GLOBAL_USER_MTU - (data_len - ETH_HLEN) + 1;  in tc_exceed_mtu_da()
215 	err = bpf_check_mtu(ctx, ifindex, &mtu_len, delta, 0);  in tc_exceed_mtu_da()
233 	int delta;  in tc_minus_delta()  local
235 	/* Borderline test case: Minus delta exceeding packet length allowed */  in tc_minus_delta()
236 	delta = -((skb_len - ETH_HLEN) + 1);  in tc_minus_delta()
238 	/* Minus length (adjusted via delta) still pass MTU check, other helpers  in tc_minus_delta()
241 	if (bpf_check_mtu(ctx, ifindex, &mtu_len, delta, 0))  in tc_minus_delta()