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Wythe" To: kgraul@linux.ibm.com, wenjia@linux.ibm.com, jaka@linux.ibm.com, wintera@linux.ibm.com, guwen@linux.alibaba.com Cc: kuba@kernel.org, davem@davemloft.net, netdev@vger.kernel.org, linux-s390@vger.kernel.org, linux-rdma@vger.kernel.org, tonylu@linux.alibaba.com, pabeni@redhat.com, edumazet@google.com Subject: [PATCH net-next v6 1/3] net/smc: refactoring initialization of smc sock Date: Wed, 5 Jun 2024 20:56:18 +0800 Message-Id: <1717592180-66181-2-git-send-email-alibuda@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1717592180-66181-1-git-send-email-alibuda@linux.alibaba.com> References: <1717592180-66181-1-git-send-email-alibuda@linux.alibaba.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: X-Patchwork-Delegate: kuba@kernel.org From: "D. Wythe" 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 Reviewed-by: Tony Lu Tested-by: Niklas Schnelle --- 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