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selftests/bpf: Fix xdp_do_redirect on s390x
s390x cache line size is 256 bytes, so skb_shared_info must be aligned on a much larger boundary than for x86. This makes the maximum packet size smaller. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Link: https://lore.kernel.org/r/20230128000650.1516334-11-iii@linux.ibm.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -65,7 +65,11 @@ static int attach_tc_prog(struct bpf_tc_hook *hook, int fd)
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/* The maximum permissible size is: PAGE_SIZE - sizeof(struct xdp_page_head) -
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* sizeof(struct skb_shared_info) - XDP_PACKET_HEADROOM = 3368 bytes
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*/
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#if defined(__s390x__)
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#define MAX_PKT_SIZE 3176
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#else
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#define MAX_PKT_SIZE 3368
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#endif
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static void test_max_pkt_size(int fd)
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{
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char data[MAX_PKT_SIZE + 1] = {};
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