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// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
SEC("xdp")
int _xdp_adjust_tail_grow(struct xdp_md *xdp)
{
int data_len = bpf_xdp_get_buff_len(xdp);
int offset = 0;
/* SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) */
#if defined(__TARGET_ARCH_s390)
int tailroom = 512;
#elif defined(__TARGET_ARCH_powerpc)
int tailroom = 384;
#else
int tailroom = 320;
#endif
/* Data length determine test case */
if (data_len == 54) { /* sizeof(pkt_v4) */
offset = 4096; /* test too large offset, 4k page size */
} else if (data_len == 53) { /* sizeof(pkt_v4) - 1 */
offset = 65536; /* test too large offset, 64k page size */
} else if (data_len == 74) { /* sizeof(pkt_v6) */
offset = 40;
} else if (data_len == 64) {
offset = 128;
} else if (data_len == 128) {
/* Max tail grow 3520 */
offset = 4096 - 256 - tailroom - data_len;
} else if (data_len == 9000) {
offset = 10;
} else if (data_len == 9001) {
offset = 4096;
} else if (data_len == 90000) {
offset = 10; /* test a small offset, 64k page size */
} else if (data_len == 90001) {
offset = 65536; /* test too large offset, 64k page size */
} else {
return XDP_ABORTED; /* No matching test */
}
if (bpf_xdp_adjust_tail(xdp, offset))
return XDP_DROP;
return XDP_TX;
}
char _license[] SEC("license") = "GPL";
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