Yonghong Song af7ec13833 bpf: Add bpf_skc_to_tcp6_sock() helper ... The helper is used in tracing programs to cast a socket pointer to a tcp6_sock pointer. The return value could be NULL if the casting is illegal. A new helper return type RET_PTR_TO_BTF_ID_OR_NULL is added so the verifier is able to deduce proper return types for the helper. Different from the previous BTF_ID based helpers, the bpf_skc_to_tcp6_sock() argument can be several possible btf_ids. More specifically, all possible socket data structures with sock_common appearing in the first in the memory layout. This patch only added socket types related to tcp and udp. All possible argument btf_id and return value btf_id for helper bpf_skc_to_tcp6_sock() are pre-calculcated and cached. In the future, it is even possible to precompute these btf_id's at kernel build time. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/20200623230809.3988195-1-yhs@fb.com		2020-06-24 18:37:59 -07:00
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asm-generic
drm	drm msm next for 5.8-rc1	2020-06-08 11:33:38 -07:00
linux	bpf: Add bpf_skc_to_tcp6_sock() helper	2020-06-24 18:37:59 -07:00
misc
mtd
rdma	RDMA 5.8 merge window pull request	2020-06-05 14:05:57 -07:00
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