Merge branch 'sockmap: add sockmap support for unix datagram socket'

Cong Wang says:

====================

From: Cong Wang <cong.wang@bytedance.com>

This is the last patchset of the original large patchset. In the
previous patchset, a new BPF sockmap program BPF_SK_SKB_VERDICT
was introduced and UDP began to support it too. In this patchset,
we add BPF_SK_SKB_VERDICT support to Unix datagram socket, so that
we can finally splice Unix datagram socket and UDP socket. Please
check each patch description for more details.

To see the big picture, the previous patchsets are available here:
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=1e0ab70778bd86a90de438cc5e1535c115a7c396
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=89d69c5d0fbcabd8656459bc8b1a476d6f1efee4

and this patchset is available here:
https://github.com/congwang/linux/tree/sockmap3
Acked-by: John Fastabend <john.fastabend@gmail.com>
---
v5: lift socket state check for dgram
    remove ->unhash() case
    add retries for EAGAIN in all test cases
    remove an unused parameter of __unix_dgram_recvmsg()
    rebase on the latest bpf-next

v4: fix af_unix disconnect case
    add unix_unhash()
    split out two small patches
    reduce u->iolock critical section
    remove an unused parameter of __unix_dgram_recvmsg()

v3: fix Kconfig dependency
    make unix_read_sock() static
    fix a UAF in unix_release()
    add a missing header unix_bpf.c

v2: separate out from the original large patchset
    rebase to the latest bpf-next
    clean up unix_read_sock()
    export sock_map_close()
    factor out some helpers in selftests for code reuse
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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