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Message-ID: <ZlbHzZ_FizAqPvNp@TONYMAC-ALIBABA.local>
Date: Wed, 29 May 2024 14:14:37 +0800
From: Tony Lu <tonylu@...ux.alibaba.com>
To: "D. Wythe" <alibuda@...ux.alibaba.com>
Cc: kgraul@...ux.ibm.com, wenjia@...ux.ibm.com, jaka@...ux.ibm.com,
wintera@...ux.ibm.com, guwen@...ux.alibaba.com, kuba@...nel.org,
davem@...emloft.net, netdev@...r.kernel.org,
linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org,
pabeni@...hat.com, edumazet@...gle.com
Subject: Re: [PATCH net-next v4 1/3] net/smc: refactoring initialization of
smc sock
On Wed, May 29, 2024 at 11:59:05AM +0800, D. Wythe wrote:
> From: "D. Wythe" <alibuda@...ux.alibaba.com>
>
> This patch aims to isolate the shared components of SMC socket
> allocation by introducing smc_sk_init() for sock initialization
> and __smc_create_clcsk() for the initialization of clcsock.
>
> This is in preparation for the subsequent implementation of the
> AF_INET version of SMC.
>
> Signed-off-by: D. Wythe <alibuda@...ux.alibaba.com>
v4 looks good for me, thanks.
Reviewed-by: Tony Lu <tonylu@...ux.alibaba.com>
> ---
> net/smc/af_smc.c | 86 +++++++++++++++++++++++++++++++-------------------------
> net/smc/smc.h | 5 ++++
> 2 files changed, 53 insertions(+), 38 deletions(-)
>
> diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
> index e50a286..77a9d58 100644
> --- a/net/smc/af_smc.c
> +++ b/net/smc/af_smc.c
> @@ -361,25 +361,15 @@ static void smc_destruct(struct sock *sk)
> return;
> }
>
> -static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
> - int protocol)
> +void smc_sk_init(struct net *net, struct sock *sk, int protocol)
> {
> - struct smc_sock *smc;
> - struct proto *prot;
> - struct sock *sk;
> -
> - prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
> - sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
> - if (!sk)
> - return NULL;
> + struct smc_sock *smc = smc_sk(sk);
>
> - sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
> sk->sk_state = SMC_INIT;
> sk->sk_destruct = smc_destruct;
> sk->sk_protocol = protocol;
> WRITE_ONCE(sk->sk_sndbuf, 2 * READ_ONCE(net->smc.sysctl_wmem));
> WRITE_ONCE(sk->sk_rcvbuf, 2 * READ_ONCE(net->smc.sysctl_rmem));
> - smc = smc_sk(sk);
> INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
> INIT_WORK(&smc->connect_work, smc_connect_work);
> INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
> @@ -389,6 +379,24 @@ static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
> sk->sk_prot->hash(sk);
> mutex_init(&smc->clcsock_release_lock);
> smc_init_saved_callbacks(smc);
> + smc->limit_smc_hs = net->smc.limit_smc_hs;
> + smc->use_fallback = false; /* assume rdma capability first */
> + smc->fallback_rsn = 0;
> +}
> +
> +static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
> + int protocol)
> +{
> + struct proto *prot;
> + struct sock *sk;
> +
> + prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
> + sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
> + if (!sk)
> + return NULL;
> +
> + sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
> + smc_sk_init(net, sk, protocol);
>
> return sk;
> }
> @@ -3321,6 +3329,31 @@ static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
> .splice_read = smc_splice_read,
> };
>
> +int smc_create_clcsk(struct net *net, struct sock *sk, int family)
> +{
> + struct smc_sock *smc = smc_sk(sk);
> + int rc;
> +
> + rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
> + &smc->clcsock);
> + if (rc) {
> + sk_common_release(sk);
> + return rc;
> + }
> +
> + /* smc_clcsock_release() does not wait smc->clcsock->sk's
> + * destruction; its sk_state might not be TCP_CLOSE after
> + * smc->sk is close()d, and TCP timers can be fired later,
> + * which need net ref.
> + */
> + sk = smc->clcsock->sk;
> + __netns_tracker_free(net, &sk->ns_tracker, false);
> + sk->sk_net_refcnt = 1;
> + get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
> + sock_inuse_add(net, 1);
> + return 0;
> +}
> +
> static int __smc_create(struct net *net, struct socket *sock, int protocol,
> int kern, struct socket *clcsock)
> {
> @@ -3346,35 +3379,12 @@ static int __smc_create(struct net *net, struct socket *sock, int protocol,
>
> /* create internal TCP socket for CLC handshake and fallback */
> smc = smc_sk(sk);
> - smc->use_fallback = false; /* assume rdma capability first */
> - smc->fallback_rsn = 0;
> -
> - /* default behavior from limit_smc_hs in every net namespace */
> - smc->limit_smc_hs = net->smc.limit_smc_hs;
>
> rc = 0;
> - if (!clcsock) {
> - rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
> - &smc->clcsock);
> - if (rc) {
> - sk_common_release(sk);
> - goto out;
> - }
> -
> - /* smc_clcsock_release() does not wait smc->clcsock->sk's
> - * destruction; its sk_state might not be TCP_CLOSE after
> - * smc->sk is close()d, and TCP timers can be fired later,
> - * which need net ref.
> - */
> - sk = smc->clcsock->sk;
> - __netns_tracker_free(net, &sk->ns_tracker, false);
> - sk->sk_net_refcnt = 1;
> - get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
> - sock_inuse_add(net, 1);
> - } else {
> + if (clcsock)
> smc->clcsock = clcsock;
> - }
> -
> + else
> + rc = smc_create_clcsk(net, sk, family);
> out:
> return rc;
> }
> diff --git a/net/smc/smc.h b/net/smc/smc.h
> index 18c8b78..3edec1e 100644
> --- a/net/smc/smc.h
> +++ b/net/smc/smc.h
> @@ -34,6 +34,11 @@
> extern struct proto smc_proto;
> extern struct proto smc_proto6;
>
> +/* smc sock initialization */
> +void smc_sk_init(struct net *net, struct sock *sk, int protocol);
> +/* clcsock initialization */
> +int smc_create_clcsk(struct net *net, struct sock *sk, int family);
> +
> #ifdef ATOMIC64_INIT
> #define KERNEL_HAS_ATOMIC64
> #endif
> --
> 1.8.3.1
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