Cong Wang says:
====================
From: Cong Wang <cong.wang@bytedance.com>
We have thousands of services connected to a daemon on every host
via AF_UNIX dgram sockets, after they are moved into VM, we have to
add a proxy to forward these communications from VM to host, because
rewriting thousands of them is not practical. This proxy uses an
AF_UNIX socket connected to services and a UDP socket to connect to
the host. It is inefficient because data is copied between kernel
space and user space twice, and we can not use splice() which only
supports TCP. Therefore, we want to use sockmap to do the splicing
without going to user-space at all (after the initial setup).
Currently sockmap only fully supports TCP, UDP is partially supported
as it is only allowed to add into sockmap. This patchset, as the second
part of the original large patchset, extends sockmap with:
1) cross-protocol support with BPF_SK_SKB_VERDICT; 2) full UDP support.
On the high level, ->read_sock() is required for each protocol to support
sockmap redirection, and in order to do sock proto update, a new ops
->psock_update_sk_prot() is introduced, which is also required. And the
BPF ->recvmsg() is also needed to replace the original ->recvmsg() to
retrieve skmsg. To make life easier, we have to get rid of lock_sock()
in sk_psock_handle_skb(), otherwise we would have to implement
->sendmsg_locked() on top of ->sendmsg(), which is ugly.
Please see each patch for more details.
To see the big picture, the original patchset is available here:
https://github.com/congwang/linux/tree/sockmap
this patchset is also available:
https://github.com/congwang/linux/tree/sockmap2
---
v8: get rid of 'offset' in udp_read_sock()
add checks for skb_verdict/stream_verdict conflict
add two cleanup patches for sock_map_link()
add a new test case
v7: use work_mutex to protect psock->work
return err in udp_read_sock()
add patch 6/13
clean up test case
v6: get rid of sk_psock_zap_ingress()
add rcu work patch
v5: use INDIRECT_CALL_2() for function pointers
use ingress_lock to fix a race condition found by Jacub
rename two helper functions
v4: get rid of lock_sock() in sk_psock_handle_skb()
get rid of udp_sendmsg_locked()
remove an empty line
update cover letter
v3: export tcp/udp_update_proto()
rename sk->sk_prot->psock_update_sk_prot()
improve changelogs
v2: separate from the original large patchset
rebase to the latest bpf-next
split UDP test case
move inet_csk_has_ulp() check to tcp_bpf.c
clean up udp_read_sock()
====================
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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