netdev - RE: [Patch bpf v3 0/8] sock_map: some bug fixes and improvements

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Date:   Tue, 01 Jun 2021 20:46:38 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
Cc:     bpf@...r.kernel.org, Cong Wang <cong.wang@...edance.com>
Subject: RE: [Patch bpf v3 0/8] sock_map: some bug fixes and improvements

Cong Wang wrote:
> From: Cong Wang <cong.wang@...edance.com>
> 
> This patchset contains a few bug fixes and improvements for sock_map.
> 
> Patch 1 improves recvmsg() accuracy for UDP, patch 2 improves UDP
> non-blocking read() by retrying on EAGAIN. With both of them, the
> failure rate of the UDP test case goes down from 10% to 1%.
> 
> Patch 3 is memory leak fix I posted, no change since v1. The rest
> patches address similar memory leaks or improve error handling,
> including one increases sk_drops counter for error cases. Please
> check each patch description for more details.

For the series. My initial concern about marking BPF drops as
socket drops appears to be common so I guess lets do it.

Acked-by: John Fastabend <john.fastabend@...il.com>

> 
> ---
> v3: add another bug fix as patch 4
>     update patch 5 accordingly
>     address John's review on the last patch
>     fix a few typos in patch descriptions
> 
> v2: group all patches together
>     set max for retries of EAGAIN
> 
> Cong Wang (8):
>   skmsg: improve udp_bpf_recvmsg() accuracy
>   selftests/bpf: Retry for EAGAIN in udp_redir_to_connected()
>   udp: fix a memory leak in udp_read_sock()
>   skmsg: clear skb redirect pointer before dropping it
>   skmsg: fix a memory leak in sk_psock_verdict_apply()
>   skmsg: teach sk_psock_verdict_apply() to return errors
>   skmsg: pass source psock to sk_psock_skb_redirect()
>   skmsg: increase sk->sk_drops when dropping packets
> 
>  include/linux/skmsg.h                         |  2 -
>  net/core/skmsg.c                              | 82 +++++++++----------
>  net/ipv4/tcp_bpf.c                            | 24 +++++-
>  net/ipv4/udp.c                                |  2 +
>  net/ipv4/udp_bpf.c                            | 47 +++++++++--
>  .../selftests/bpf/prog_tests/sockmap_listen.c |  7 +-
>  6 files changed, 112 insertions(+), 52 deletions(-)
> 
> -- 
> 2.25.1
>