liujian (CE) wrote: > > > > -----Original Message----- > > From: Cong Wang [mailto:xiyou.wangcong@xxxxxxxxx] > > Sent: Monday, September 26, 2022 2:26 AM > > To: liujian (CE) <liujian56@xxxxxxxxxx> > > Cc: John Fastabend <john.fastabend@xxxxxxxxx>; Jakub Sitnicki > > <jakub@xxxxxxxxxxxxxx>; Eric Dumazet <edumazet@xxxxxxxxxx>; davem > > <davem@xxxxxxxxxxxxx>; yoshfuji@xxxxxxxxxxxxxx; dsahern@xxxxxxxxxx; > > Jakub Kicinski <kuba@xxxxxxxxxx>; Paolo Abeni <pabeni@xxxxxxxxxx>; > > netdev <netdev@xxxxxxxxxxxxxxx>; bpf@xxxxxxxxxxxxxxx > > Subject: Re: [bug report] one possible out-of-order issue in sockmap > > > > On Sat, Sep 24, 2022 at 07:59:15AM +0000, liujian (CE) wrote: > > > Hello, > > > > > > I had a scp failure problem here. I analyze the code, and the reasons may > > be as follows: > > > > > > From commit e7a5f1f1cd00 ("bpf/sockmap: Read psock ingress_msg > > before > > > sk_receive_queue", if we use sockops > > > (BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB > > > and BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB) to enable socket's > > sockmap > > > function, and don't enable strparse and verdict function, the > > > out-of-order problem may occur in the following process. > > > > > > client SK server SK > > > ---------------------------------------------------------------------- > > > ---- > > > tcp_rcv_synsent_state_process > > > tcp_finish_connect > > > tcp_init_transfer > > > tcp_set_state(sk, TCP_ESTABLISHED); > > > // insert SK to sockmap > > > wake up waitter > > > tcp_send_ack > > > > > > tcp_bpf_sendmsg(msgA) > > > // msgA will go tcp stack > > > tcp_rcv_state_process > > > tcp_init_transfer > > > //insert SK to sockmap > > > tcp_set_state(sk, > > > TCP_ESTABLISHED) > > > wake up waitter > > > > Here after the socket is inserted to a sockmap, its ->sk_data_ready() is > > already replaced with sk_psock_verdict_data_ready(), so msgA should go to > > sockmap, not TCP stack? > > > It is TCP stack. Here I only enable BPF_SK_MSG_VERDICT type. > bpftool prog load bpf_redir.o /sys/fs/bpf/bpf_redir map name sock_ops_map pinned /sys/fs/bpf/sock_ops_map > bpftool prog attach pinned /sys/fs/bpf/bpf_redir msg_verdict pinned /sys/fs/bpf/sock_ops_map Is the sender using FAST_OPEN by any chance? We know this bug exists in this case. Fix tbd.
