smc_hs_congested
bool (*smc_hs_congested)(const struct sock *sk);
ireq->smc_ok = rx_opt->smc_ok && !(tcp_sk(sk)->smc_hs_congested &&
tcp_sk(sk)->smc_hs_congested(sk));
tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested;