| Message ID | 1727408549-106551-1-git-send-email-alibuda@linux.alibaba.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [RFC,net-next,v2] net/smc: Introduce a hook to modify syn_smc at runtime | expand |
在 2024/9/27 11:42, D. Wythe 写道: > From: "D. Wythe" <alibuda@linux.alibaba.com> > > The introduction of IPPROTO_SMC enables eBPF programs to determine > whether to use SMC based on the context of socket creation, such as > network namespaces, PID and comm name, etc. > > As a subsequent enhancement, this patch introduces a new hook for eBPF > programs that allows decisions on whether to use SMC or not at runtime, > including but not limited to local/remote IP address or ports. In > simpler words, this feature allows modifications to syn_smc through eBPF > programs before the TCP three-way handshake got established. > > Thanks to kfunc for making it easier for us to implement this feature in > SMC. > > Signed-off-by: D. Wythe <alibuda@linux.alibaba.com> > > --- > v1 -> v2: > 1. Fix wrong use of ireq->smc_ok, should be rx_opt->smc_ok. > 2. Fix compile error when CONFIG_IPV6 or CONFIG_BPF_SYSCALL was not set. > > --- > include/linux/tcp.h | 4 ++- > net/ipv4/tcp_input.c | 4 +-- > net/smc/af_smc.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++------ > 3 files changed, 72 insertions(+), 11 deletions(-) > > diff --git a/include/linux/tcp.h b/include/linux/tcp.h > index 6a5e08b..d028d76 100644 > --- a/include/linux/tcp.h > +++ b/include/linux/tcp.h > @@ -478,7 +478,9 @@ struct tcp_sock { > #endif > #if IS_ENABLED(CONFIG_SMC) > bool syn_smc; /* SYN includes SMC */ > - bool (*smc_hs_congested)(const struct sock *sk); > + void (*smc_openreq_init)(struct request_sock *req, > + const struct tcp_options_received *rx_opt, > + struct sk_buff *skb, const struct sock *sk); > #endif > > #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) > diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c > index 9f314df..99f34f5 100644 > --- a/net/ipv4/tcp_input.c > +++ b/net/ipv4/tcp_input.c > @@ -7036,8 +7036,8 @@ static void tcp_openreq_init(struct request_sock *req, > ireq->ir_num = ntohs(tcp_hdr(skb)->dest); > ireq->ir_mark = inet_request_mark(sk, skb); > #if IS_ENABLED(CONFIG_SMC) > - ireq->smc_ok = rx_opt->smc_ok && !(tcp_sk(sk)->smc_hs_congested && > - tcp_sk(sk)->smc_hs_congested(sk)); > + if (rx_opt->smc_ok && tcp_sk(sk)->smc_openreq_init) > + tcp_sk(sk)->smc_openreq_init(req, rx_opt, skb, sk); > #endif > } > > diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c > index 0316217..fdac7e2b 100644 > --- a/net/smc/af_smc.c > +++ b/net/smc/af_smc.c > @@ -70,6 +70,15 @@ > static void smc_tcp_listen_work(struct work_struct *); > static void smc_connect_work(struct work_struct *); > > +__bpf_hook_start(); > + > +__weak noinline int select_syn_smc(const struct sock *sk, struct sockaddr *peer) > +{ > + return 1; > +} > + > +__bpf_hook_end(); > + > int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb) > { > struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); > @@ -156,19 +165,43 @@ static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk, > return NULL; > } > > -static bool smc_hs_congested(const struct sock *sk) > +static void smc_openreq_init(struct request_sock *req, > + const struct tcp_options_received *rx_opt, > + struct sk_buff *skb, const struct sock *sk) > { > + struct inet_request_sock *ireq = inet_rsk(req); > + struct sockaddr_storage rmt_sockaddr = {0}; A trivial problem. The following should be better? struct sockaddr_storage rmt_sockaddr = {}; I think, we have discussed this problem in RDMA maillist for several times. Zhu Yanjun > const struct smc_sock *smc; > > smc = smc_clcsock_user_data(sk); > > if (!smc) > - return true; > + return; > > - if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq)) > - return true; > + if (smc->limit_smc_hs && workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq)) > + goto out_no_smc; > > - return false; > + rmt_sockaddr.ss_family = sk->sk_family; > + > + if (rmt_sockaddr.ss_family == AF_INET) { > + struct sockaddr_in *rmt4_sockaddr = (struct sockaddr_in *)&rmt_sockaddr; > + > + rmt4_sockaddr->sin_addr.s_addr = ireq->ir_rmt_addr; > + rmt4_sockaddr->sin_port = ireq->ir_rmt_port; > +#if IS_ENABLED(CONFIG_IPV6) > + } else { > + struct sockaddr_in6 *rmt6_sockaddr = (struct sockaddr_in6 *)&rmt_sockaddr; > + > + rmt6_sockaddr->sin6_addr = ireq->ir_v6_rmt_addr; > + rmt6_sockaddr->sin6_port = ireq->ir_rmt_port; > +#endif /* CONFIG_IPV6 */ > + } > + > + ireq->smc_ok = select_syn_smc(sk, (struct sockaddr *)&rmt_sockaddr); > + return; > +out_no_smc: > + ireq->smc_ok = 0; > + return; > } > > struct smc_hashinfo smc_v4_hashinfo = { > @@ -1671,7 +1704,7 @@ int smc_connect(struct socket *sock, struct sockaddr *addr, > } > > smc_copy_sock_settings_to_clc(smc); > - tcp_sk(smc->clcsock->sk)->syn_smc = 1; > + tcp_sk(smc->clcsock->sk)->syn_smc = select_syn_smc(sk, addr); > if (smc->connect_nonblock) { > rc = -EALREADY; > goto out; > @@ -2650,8 +2683,7 @@ int smc_listen(struct socket *sock, int backlog) > > inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops; > > - if (smc->limit_smc_hs) > - tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested; > + tcp_sk(smc->clcsock->sk)->smc_openreq_init = smc_openreq_init; > > rc = kernel_listen(smc->clcsock, backlog); > if (rc) { > @@ -3475,6 +3507,24 @@ static void __net_exit smc_net_stat_exit(struct net *net) > .exit = smc_net_stat_exit, > }; > > +#if IS_ENABLED(CONFIG_BPF_SYSCALL) > +BTF_SET8_START(bpf_smc_fmodret_ids) > +BTF_ID_FLAGS(func, select_syn_smc) > +BTF_SET8_END(bpf_smc_fmodret_ids) > + > +static const struct btf_kfunc_id_set bpf_smc_fmodret_set = { > + .owner = THIS_MODULE, > + .set = &bpf_smc_fmodret_ids, > +}; > + > +static int bpf_smc_kfunc_init(void) > +{ > + return register_btf_fmodret_id_set(&bpf_smc_fmodret_set); > +} > +#else > +static inline int bpf_smc_kfunc_init(void) { return 0; } > +#endif /* CONFIG_BPF_SYSCALL */ > + > static int __init smc_init(void) > { > int rc; > @@ -3574,8 +3624,17 @@ static int __init smc_init(void) > pr_err("%s: smc_inet_init fails with %d\n", __func__, rc); > goto out_ulp; > } > + > + rc = bpf_smc_kfunc_init(); > + if (rc) { > + pr_err("%s: bpf_smc_kfunc_init fails with %d\n", __func__, rc); > + goto out_inet; > + } > + > static_branch_enable(&tcp_have_smc); > return 0; > +out_inet: > + smc_inet_exit(); > out_ulp: > tcp_unregister_ulp(&smc_ulp_ops); > out_lo:
On 9/29/24 7:56 PM, Zhu Yanjun wrote: > 在 2024/9/27 11:42, D. Wythe 写道: >> From: "D. Wythe" <alibuda@linux.alibaba.com> >> >> The introduction of IPPROTO_SMC enables eBPF programs to determine >> whether to use SMC based on the context of socket creation, such as >> network namespaces, PID and comm name, etc. >> >> As a subsequent enhancement, this patch introduces a new hook for eBPF >> programs that allows decisions on whether to use SMC or not at runtime, >> including but not limited to local/remote IP address or ports. In >> simpler words, this feature allows modifications to syn_smc through eBPF >> programs before the TCP three-way handshake got established. >> >> Thanks to kfunc for making it easier for us to implement this feature in >> SMC. >> >> Signed-off-by: D. Wythe <alibuda@linux.alibaba.com> >> >> --- >> v1 -> v2: >> 1. Fix wrong use of ireq->smc_ok, should be rx_opt->smc_ok. >> 2. Fix compile error when CONFIG_IPV6 or CONFIG_BPF_SYSCALL was not set. >> >> --- >> include/linux/tcp.h | 4 ++- >> net/ipv4/tcp_input.c | 4 +-- >> net/smc/af_smc.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++------ >> 3 files changed, 72 insertions(+), 11 deletions(-) >> >> diff --git a/include/linux/tcp.h b/include/linux/tcp.h >> index 6a5e08b..d028d76 100644 >> --- a/include/linux/tcp.h >> +++ b/include/linux/tcp.h >> @@ -478,7 +478,9 @@ struct tcp_sock { >> #endif >> #if IS_ENABLED(CONFIG_SMC) >> bool syn_smc; /* SYN includes SMC */ >> - bool (*smc_hs_congested)(const struct sock *sk); >> + void (*smc_openreq_init)(struct request_sock *req, >> + const struct tcp_options_received *rx_opt, >> + struct sk_buff *skb, const struct sock *sk); >> #endif >> #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) >> diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c >> index 9f314df..99f34f5 100644 >> --- a/net/ipv4/tcp_input.c >> +++ b/net/ipv4/tcp_input.c >> @@ -7036,8 +7036,8 @@ static void tcp_openreq_init(struct request_sock *req, >> ireq->ir_num = ntohs(tcp_hdr(skb)->dest); >> ireq->ir_mark = inet_request_mark(sk, skb); >> #if IS_ENABLED(CONFIG_SMC) >> - ireq->smc_ok = rx_opt->smc_ok && !(tcp_sk(sk)->smc_hs_congested && >> - tcp_sk(sk)->smc_hs_congested(sk)); >> + if (rx_opt->smc_ok && tcp_sk(sk)->smc_openreq_init) >> + tcp_sk(sk)->smc_openreq_init(req, rx_opt, skb, sk); >> #endif >> } >> diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c >> index 0316217..fdac7e2b 100644 >> --- a/net/smc/af_smc.c >> +++ b/net/smc/af_smc.c >> @@ -70,6 +70,15 @@ >> static void smc_tcp_listen_work(struct work_struct *); >> static void smc_connect_work(struct work_struct *); >> +__bpf_hook_start(); >> + >> +__weak noinline int select_syn_smc(const struct sock *sk, struct sockaddr *peer) >> +{ >> + return 1; >> +} >> + >> +__bpf_hook_end(); >> + >> int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb) >> { >> struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); >> @@ -156,19 +165,43 @@ static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk, >> return NULL; >> } >> -static bool smc_hs_congested(const struct sock *sk) >> +static void smc_openreq_init(struct request_sock *req, >> + const struct tcp_options_received *rx_opt, >> + struct sk_buff *skb, const struct sock *sk) >> { >> + struct inet_request_sock *ireq = inet_rsk(req); >> + struct sockaddr_storage rmt_sockaddr = {0}; > > A trivial problem. > > The following should be better? > > struct sockaddr_storage rmt_sockaddr = {}; > > I think, we have discussed this problem in RDMA maillist for several times. > > Zhu Yanjun This is truly new information to me. Can you provide me with some discussion links? Thanks. D. Wythe > >> const struct smc_sock *smc; >> smc = smc_clcsock_user_data(sk); >> if (!smc) >> - return true; >> + return; >> - if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq)) >> - return true; >> + if (smc->limit_smc_hs && workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq)) >> + goto out_no_smc; >> - return false; >> + rmt_sockaddr.ss_family = sk->sk_family; >> + >> + if (rmt_sockaddr.ss_family == AF_INET) { >> + struct sockaddr_in *rmt4_sockaddr = (struct sockaddr_in *)&rmt_sockaddr; >> + >> + rmt4_sockaddr->sin_addr.s_addr = ireq->ir_rmt_addr; >> + rmt4_sockaddr->sin_port = ireq->ir_rmt_port; >> +#if IS_ENABLED(CONFIG_IPV6) >> + } else { >> + struct sockaddr_in6 *rmt6_sockaddr = (struct sockaddr_in6 *)&rmt_sockaddr; >> + >> + rmt6_sockaddr->sin6_addr = ireq->ir_v6_rmt_addr; >> + rmt6_sockaddr->sin6_port = ireq->ir_rmt_port; >> +#endif /* CONFIG_IPV6 */ >> + } >> + >> + ireq->smc_ok = select_syn_smc(sk, (struct sockaddr *)&rmt_sockaddr); >> + return; >> +out_no_smc: >> + ireq->smc_ok = 0; >> + return; >> } >> struct smc_hashinfo smc_v4_hashinfo = { >> @@ -1671,7 +1704,7 @@ int smc_connect(struct socket *sock, struct sockaddr *addr, >> } >> smc_copy_sock_settings_to_clc(smc); >> - tcp_sk(smc->clcsock->sk)->syn_smc = 1; >> + tcp_sk(smc->clcsock->sk)->syn_smc = select_syn_smc(sk, addr); >> if (smc->connect_nonblock) { >> rc = -EALREADY; >> goto out; >> @@ -2650,8 +2683,7 @@ int smc_listen(struct socket *sock, int backlog) >> inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops; >> - if (smc->limit_smc_hs) >> - tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested; >> + tcp_sk(smc->clcsock->sk)->smc_openreq_init = smc_openreq_init; >> rc = kernel_listen(smc->clcsock, backlog); >> if (rc) { >> @@ -3475,6 +3507,24 @@ static void __net_exit smc_net_stat_exit(struct net *net) >> .exit = smc_net_stat_exit, >> }; >> +#if IS_ENABLED(CONFIG_BPF_SYSCALL) >> +BTF_SET8_START(bpf_smc_fmodret_ids) >> +BTF_ID_FLAGS(func, select_syn_smc) >> +BTF_SET8_END(bpf_smc_fmodret_ids) >> + >> +static const struct btf_kfunc_id_set bpf_smc_fmodret_set = { >> + .owner = THIS_MODULE, >> + .set = &bpf_smc_fmodret_ids, >> +}; >> + >> +static int bpf_smc_kfunc_init(void) >> +{ >> + return register_btf_fmodret_id_set(&bpf_smc_fmodret_set); >> +} >> +#else >> +static inline int bpf_smc_kfunc_init(void) { return 0; } >> +#endif /* CONFIG_BPF_SYSCALL */ >> + >> static int __init smc_init(void) >> { >> int rc; >> @@ -3574,8 +3624,17 @@ static int __init smc_init(void) >> pr_err("%s: smc_inet_init fails with %d\n", __func__, rc); >> goto out_ulp; >> } >> + >> + rc = bpf_smc_kfunc_init(); >> + if (rc) { >> + pr_err("%s: bpf_smc_kfunc_init fails with %d\n", __func__, rc); >> + goto out_inet; >> + } >> + >> static_branch_enable(&tcp_have_smc); >> return 0; >> +out_inet: >> + smc_inet_exit(); >> out_ulp: >> tcp_unregister_ulp(&smc_ulp_ops); >> out_lo:
在 2024/9/30 15:15, D. Wythe 写道: > > > On 9/29/24 7:56 PM, Zhu Yanjun wrote: >> 在 2024/9/27 11:42, D. Wythe 写道: >>> From: "D. Wythe" <alibuda@linux.alibaba.com> >>> >>> The introduction of IPPROTO_SMC enables eBPF programs to determine >>> whether to use SMC based on the context of socket creation, such as >>> network namespaces, PID and comm name, etc. >>> >>> As a subsequent enhancement, this patch introduces a new hook for eBPF >>> programs that allows decisions on whether to use SMC or not at runtime, >>> including but not limited to local/remote IP address or ports. In >>> simpler words, this feature allows modifications to syn_smc through eBPF >>> programs before the TCP three-way handshake got established. >>> >>> Thanks to kfunc for making it easier for us to implement this feature in >>> SMC. >>> >>> Signed-off-by: D. Wythe <alibuda@linux.alibaba.com> >>> >>> --- >>> v1 -> v2: >>> 1. Fix wrong use of ireq->smc_ok, should be rx_opt->smc_ok. >>> 2. Fix compile error when CONFIG_IPV6 or CONFIG_BPF_SYSCALL was not set. >>> >>> --- >>> include/linux/tcp.h | 4 ++- >>> net/ipv4/tcp_input.c | 4 +-- >>> net/smc/af_smc.c | 75 +++++++++++++++++++++++++++++++++++++++++ >>> +++++------ >>> 3 files changed, 72 insertions(+), 11 deletions(-) >>> >>> diff --git a/include/linux/tcp.h b/include/linux/tcp.h >>> index 6a5e08b..d028d76 100644 >>> --- a/include/linux/tcp.h >>> +++ b/include/linux/tcp.h >>> @@ -478,7 +478,9 @@ struct tcp_sock { >>> #endif >>> #if IS_ENABLED(CONFIG_SMC) >>> bool syn_smc; /* SYN includes SMC */ >>> - bool (*smc_hs_congested)(const struct sock *sk); >>> + void (*smc_openreq_init)(struct request_sock *req, >>> + const struct tcp_options_received *rx_opt, >>> + struct sk_buff *skb, const struct sock *sk); >>> #endif >>> #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) >>> diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c >>> index 9f314df..99f34f5 100644 >>> --- a/net/ipv4/tcp_input.c >>> +++ b/net/ipv4/tcp_input.c >>> @@ -7036,8 +7036,8 @@ static void tcp_openreq_init(struct >>> request_sock *req, >>> ireq->ir_num = ntohs(tcp_hdr(skb)->dest); >>> ireq->ir_mark = inet_request_mark(sk, skb); >>> #if IS_ENABLED(CONFIG_SMC) >>> - ireq->smc_ok = rx_opt->smc_ok && !(tcp_sk(sk)->smc_hs_congested && >>> - tcp_sk(sk)->smc_hs_congested(sk)); >>> + if (rx_opt->smc_ok && tcp_sk(sk)->smc_openreq_init) >>> + tcp_sk(sk)->smc_openreq_init(req, rx_opt, skb, sk); >>> #endif >>> } >>> diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c >>> index 0316217..fdac7e2b 100644 >>> --- a/net/smc/af_smc.c >>> +++ b/net/smc/af_smc.c >>> @@ -70,6 +70,15 @@ >>> static void smc_tcp_listen_work(struct work_struct *); >>> static void smc_connect_work(struct work_struct *); >>> +__bpf_hook_start(); >>> + >>> +__weak noinline int select_syn_smc(const struct sock *sk, struct >>> sockaddr *peer) >>> +{ >>> + return 1; >>> +} >>> + >>> +__bpf_hook_end(); >>> + >>> int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct >>> netlink_callback *cb) >>> { >>> struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); >>> @@ -156,19 +165,43 @@ static struct sock *smc_tcp_syn_recv_sock(const >>> struct sock *sk, >>> return NULL; >>> } >>> -static bool smc_hs_congested(const struct sock *sk) >>> +static void smc_openreq_init(struct request_sock *req, >>> + const struct tcp_options_received *rx_opt, >>> + struct sk_buff *skb, const struct sock *sk) >>> { >>> + struct inet_request_sock *ireq = inet_rsk(req); >>> + struct sockaddr_storage rmt_sockaddr = {0}; >> >> A trivial problem. >> >> The following should be better? >> >> struct sockaddr_storage rmt_sockaddr = {}; >> >> I think, we have discussed this problem in RDMA maillist for several >> times. >> >> Zhu Yanjun > > > This is truly new information to me. Can you provide me with some > discussion links? > Thanks. It is a trivial problem. This is the link https://www.spinics.net/lists/linux-rdma/msg119815.html Zhu Yanjun > > D. Wythe > > >> >>> const struct smc_sock *smc; >>> smc = smc_clcsock_user_data(sk); >>> if (!smc) >>> - return true; >>> + return; >>> - if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq)) >>> - return true; >>> + if (smc->limit_smc_hs && workqueue_congested(WORK_CPU_UNBOUND, >>> smc_hs_wq)) >>> + goto out_no_smc; >>> - return false; >>> + rmt_sockaddr.ss_family = sk->sk_family; >>> + >>> + if (rmt_sockaddr.ss_family == AF_INET) { >>> + struct sockaddr_in *rmt4_sockaddr = (struct sockaddr_in >>> *)&rmt_sockaddr; >>> + >>> + rmt4_sockaddr->sin_addr.s_addr = ireq->ir_rmt_addr; >>> + rmt4_sockaddr->sin_port = ireq->ir_rmt_port; >>> +#if IS_ENABLED(CONFIG_IPV6) >>> + } else { >>> + struct sockaddr_in6 *rmt6_sockaddr = (struct sockaddr_in6 >>> *)&rmt_sockaddr; >>> + >>> + rmt6_sockaddr->sin6_addr = ireq->ir_v6_rmt_addr; >>> + rmt6_sockaddr->sin6_port = ireq->ir_rmt_port; >>> +#endif /* CONFIG_IPV6 */ >>> + } >>> + >>> + ireq->smc_ok = select_syn_smc(sk, (struct sockaddr >>> *)&rmt_sockaddr); >>> + return; >>> +out_no_smc: >>> + ireq->smc_ok = 0; >>> + return; >>> } >>> struct smc_hashinfo smc_v4_hashinfo = { >>> @@ -1671,7 +1704,7 @@ int smc_connect(struct socket *sock, struct >>> sockaddr *addr, >>> } >>> smc_copy_sock_settings_to_clc(smc); >>> - tcp_sk(smc->clcsock->sk)->syn_smc = 1; >>> + tcp_sk(smc->clcsock->sk)->syn_smc = select_syn_smc(sk, addr); >>> if (smc->connect_nonblock) { >>> rc = -EALREADY; >>> goto out; >>> @@ -2650,8 +2683,7 @@ int smc_listen(struct socket *sock, int backlog) >>> inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops; >>> - if (smc->limit_smc_hs) >>> - tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested; >>> + tcp_sk(smc->clcsock->sk)->smc_openreq_init = smc_openreq_init; >>> rc = kernel_listen(smc->clcsock, backlog); >>> if (rc) { >>> @@ -3475,6 +3507,24 @@ static void __net_exit >>> smc_net_stat_exit(struct net *net) >>> .exit = smc_net_stat_exit, >>> }; >>> +#if IS_ENABLED(CONFIG_BPF_SYSCALL) >>> +BTF_SET8_START(bpf_smc_fmodret_ids) >>> +BTF_ID_FLAGS(func, select_syn_smc) >>> +BTF_SET8_END(bpf_smc_fmodret_ids) >>> + >>> +static const struct btf_kfunc_id_set bpf_smc_fmodret_set = { >>> + .owner = THIS_MODULE, >>> + .set = &bpf_smc_fmodret_ids, >>> +}; >>> + >>> +static int bpf_smc_kfunc_init(void) >>> +{ >>> + return register_btf_fmodret_id_set(&bpf_smc_fmodret_set); >>> +} >>> +#else >>> +static inline int bpf_smc_kfunc_init(void) { return 0; } >>> +#endif /* CONFIG_BPF_SYSCALL */ >>> + >>> static int __init smc_init(void) >>> { >>> int rc; >>> @@ -3574,8 +3624,17 @@ static int __init smc_init(void) >>> pr_err("%s: smc_inet_init fails with %d\n", __func__, rc); >>> goto out_ulp; >>> } >>> + >>> + rc = bpf_smc_kfunc_init(); >>> + if (rc) { >>> + pr_err("%s: bpf_smc_kfunc_init fails with %d\n", __func__, rc); >>> + goto out_inet; >>> + } >>> + >>> static_branch_enable(&tcp_have_smc); >>> return 0; >>> +out_inet: >>> + smc_inet_exit(); >>> out_ulp: >>> tcp_unregister_ulp(&smc_ulp_ops); >>> out_lo:
diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 6a5e08b..d028d76 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -478,7 +478,9 @@ struct tcp_sock { #endif #if IS_ENABLED(CONFIG_SMC) bool syn_smc; /* SYN includes SMC */ - bool (*smc_hs_congested)(const struct sock *sk); + void (*smc_openreq_init)(struct request_sock *req, + const struct tcp_options_received *rx_opt, + struct sk_buff *skb, const struct sock *sk); #endif #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 9f314df..99f34f5 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -7036,8 +7036,8 @@ static void tcp_openreq_init(struct request_sock *req, ireq->ir_num = ntohs(tcp_hdr(skb)->dest); ireq->ir_mark = inet_request_mark(sk, skb); #if IS_ENABLED(CONFIG_SMC) - ireq->smc_ok = rx_opt->smc_ok && !(tcp_sk(sk)->smc_hs_congested && - tcp_sk(sk)->smc_hs_congested(sk)); + if (rx_opt->smc_ok && tcp_sk(sk)->smc_openreq_init) + tcp_sk(sk)->smc_openreq_init(req, rx_opt, skb, sk); #endif } diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 0316217..fdac7e2b 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -70,6 +70,15 @@ static void smc_tcp_listen_work(struct work_struct *); static void smc_connect_work(struct work_struct *); +__bpf_hook_start(); + +__weak noinline int select_syn_smc(const struct sock *sk, struct sockaddr *peer) +{ + return 1; +} + +__bpf_hook_end(); + int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb) { struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); @@ -156,19 +165,43 @@ static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk, return NULL; } -static bool smc_hs_congested(const struct sock *sk) +static void smc_openreq_init(struct request_sock *req, + const struct tcp_options_received *rx_opt, + struct sk_buff *skb, const struct sock *sk) { + struct inet_request_sock *ireq = inet_rsk(req); + struct sockaddr_storage rmt_sockaddr = {0}; const struct smc_sock *smc; smc = smc_clcsock_user_data(sk); if (!smc) - return true; + return; - if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq)) - return true; + if (smc->limit_smc_hs && workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq)) + goto out_no_smc; - return false; + rmt_sockaddr.ss_family = sk->sk_family; + + if (rmt_sockaddr.ss_family == AF_INET) { + struct sockaddr_in *rmt4_sockaddr = (struct sockaddr_in *)&rmt_sockaddr; + + rmt4_sockaddr->sin_addr.s_addr = ireq->ir_rmt_addr; + rmt4_sockaddr->sin_port = ireq->ir_rmt_port; +#if IS_ENABLED(CONFIG_IPV6) + } else { + struct sockaddr_in6 *rmt6_sockaddr = (struct sockaddr_in6 *)&rmt_sockaddr; + + rmt6_sockaddr->sin6_addr = ireq->ir_v6_rmt_addr; + rmt6_sockaddr->sin6_port = ireq->ir_rmt_port; +#endif /* CONFIG_IPV6 */ + } + + ireq->smc_ok = select_syn_smc(sk, (struct sockaddr *)&rmt_sockaddr); + return; +out_no_smc: + ireq->smc_ok = 0; + return; } struct smc_hashinfo smc_v4_hashinfo = { @@ -1671,7 +1704,7 @@ int smc_connect(struct socket *sock, struct sockaddr *addr, } smc_copy_sock_settings_to_clc(smc); - tcp_sk(smc->clcsock->sk)->syn_smc = 1; + tcp_sk(smc->clcsock->sk)->syn_smc = select_syn_smc(sk, addr); if (smc->connect_nonblock) { rc = -EALREADY; goto out; @@ -2650,8 +2683,7 @@ int smc_listen(struct socket *sock, int backlog) inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops; - if (smc->limit_smc_hs) - tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested; + tcp_sk(smc->clcsock->sk)->smc_openreq_init = smc_openreq_init; rc = kernel_listen(smc->clcsock, backlog); if (rc) { @@ -3475,6 +3507,24 @@ static void __net_exit smc_net_stat_exit(struct net *net) .exit = smc_net_stat_exit, }; +#if IS_ENABLED(CONFIG_BPF_SYSCALL) +BTF_SET8_START(bpf_smc_fmodret_ids) +BTF_ID_FLAGS(func, select_syn_smc) +BTF_SET8_END(bpf_smc_fmodret_ids) + +static const struct btf_kfunc_id_set bpf_smc_fmodret_set = { + .owner = THIS_MODULE, + .set = &bpf_smc_fmodret_ids, +}; + +static int bpf_smc_kfunc_init(void) +{ + return register_btf_fmodret_id_set(&bpf_smc_fmodret_set); +} +#else +static inline int bpf_smc_kfunc_init(void) { return 0; } +#endif /* CONFIG_BPF_SYSCALL */ + static int __init smc_init(void) { int rc; @@ -3574,8 +3624,17 @@ static int __init smc_init(void) pr_err("%s: smc_inet_init fails with %d\n", __func__, rc); goto out_ulp; } + + rc = bpf_smc_kfunc_init(); + if (rc) { + pr_err("%s: bpf_smc_kfunc_init fails with %d\n", __func__, rc); + goto out_inet; + } + static_branch_enable(&tcp_have_smc); return 0; +out_inet: + smc_inet_exit(); out_ulp: tcp_unregister_ulp(&smc_ulp_ops); out_lo: