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BPF does work in different namespaces, see kernel/bpf/net_namespace.c and include/linux/bpf-netns.h. I think we should continue to use the pernet sched_list. v6 just sent out. Thanks, -Geliang On Thu, Mar 24, 2022 at 04:36:51PM -0700, Mat Martineau wrote: > On Thu, 24 Mar 2022, Mat Martineau wrote: > > > On Thu, 24 Mar 2022, Mat Martineau wrote: > > > > > On Thu, 24 Mar 2022, Geliang Tang wrote: > > > > > > > This patch added struct mptcp_sched_ops. And define the scheduler > > > > register, unregister and find functions. > > > > > > > > Signed-off-by: Geliang Tang > > > > --- > > > > include/net/mptcp.h | 13 +++++ > > > > net/mptcp/Makefile | 2 +- > > > > net/mptcp/protocol.c | 1 + > > > > net/mptcp/protocol.h | 7 +++ > > > > net/mptcp/sched.c | 114 +++++++++++++++++++++++++++++++++++++++++++ > > > > 5 files changed, 136 insertions(+), 1 deletion(-) > > > > create mode 100644 net/mptcp/sched.c > > > > > > > > diff --git a/include/net/mptcp.h b/include/net/mptcp.h > > > > index 8b1afd6f5cc4..e3a0baa8dbd7 100644 > > > > --- a/include/net/mptcp.h > > > > +++ b/include/net/mptcp.h > > > > @@ -95,6 +95,19 @@ struct mptcp_out_options { > > > > #endif > > > > }; > > > > > > > > +#define MPTCP_SCHED_NAME_MAX 16 > > > > + > > > > +struct mptcp_sched_ops { > > > > + struct sock * (*get_subflow)(struct mptcp_sock *msk); > > > > + > > > > + char name[MPTCP_SCHED_NAME_MAX]; > > > > + struct module *owner; > > > > + struct list_head list; > > > > + > > > > + void (*init)(struct mptcp_sock *msk); > > > > + void (*release)(struct mptcp_sock *msk); > > > > +} ____cacheline_aligned_in_smp; > > > > + > > > > #ifdef CONFIG_MPTCP > > > > extern struct request_sock_ops mptcp_subflow_request_sock_ops; > > > > > > > > diff --git a/net/mptcp/Makefile b/net/mptcp/Makefile > > > > index 0a0608b6b4b4..aa5c10d1b80a 100644 > > > > --- a/net/mptcp/Makefile > > > > +++ b/net/mptcp/Makefile > > > > @@ -3,7 +3,7 @@ obj-$(CONFIG_MPTCP) += mptcp.o > > > > ccflags-y += -DDEBUG > > > > > > This line of context keeps making 'git am' fail - looks like you > > > have a debug-enabling commit in your private tree? > > > > > > This is probably why patchew is having trouble with this series too. > > > > > > - Mat > > > > > > > > > > > mptcp-y := protocol.o subflow.o options.o token.o crypto.o > > > > ctrl.o pm.o diag.o \ > > > > - mib.o pm_netlink.o sockopt.o > > > > + mib.o pm_netlink.o sockopt.o sched.o > > > > > > > > obj-$(CONFIG_SYN_COOKIES) += syncookies.o > > > > obj-$(CONFIG_INET_MPTCP_DIAG) += mptcp_diag.o > > > > diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c > > > > index d3887f628b54..b1d7c8b0c112 100644 > > > > --- a/net/mptcp/protocol.c > > > > +++ b/net/mptcp/protocol.c > > > > @@ -3807,6 +3807,7 @@ void __init mptcp_proto_init(void) > > > > > > > > mptcp_subflow_init(); > > > > mptcp_pm_init(); > > > > + mptcp_sched_init(); > > > > mptcp_token_init(); > > > > > > > > if (proto_register(&mptcp_prot, MPTCP_USE_SLAB) != 0) > > > > diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h > > > > index fd82fd113113..3258b740c8ee 100644 > > > > --- a/net/mptcp/protocol.h > > > > +++ b/net/mptcp/protocol.h > > > > @@ -608,6 +608,13 @@ int mptcp_subflow_create_socket(struct sock > > > > *sk, struct socket **new_sock); > > > > void mptcp_info2sockaddr(const struct mptcp_addr_info *info, > > > > struct sockaddr_storage *addr, > > > > unsigned short family); > > > > +struct mptcp_sched_ops *mptcp_sched_find(const struct net *net, > > > > + const char *name); > > > > +int mptcp_register_scheduler(const struct net *net, > > > > + struct mptcp_sched_ops *sched); > > > > +void mptcp_unregister_scheduler(const struct net *net, > > > > + struct mptcp_sched_ops *sched); > > > > +void mptcp_sched_init(void); > > > > > > > > static inline bool __mptcp_subflow_active(struct > > > > mptcp_subflow_context *subflow) > > > > { > > > > diff --git a/net/mptcp/sched.c b/net/mptcp/sched.c > > > > new file mode 100644 > > > > index 000000000000..3798a5cefeb6 > > > > --- /dev/null > > > > +++ b/net/mptcp/sched.c > > > > @@ -0,0 +1,114 @@ > > > > +// SPDX-License-Identifier: GPL-2.0 > > > > +/* Multipath TCP > > > > + * > > > > + * Copyright (c) 2022, SUSE. > > > > + */ > > > > + > > > > +#define pr_fmt(fmt) "MPTCP: " fmt > > > > + > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include "protocol.h" > > > > + > > > > +static int sched_pernet_id; > > > > + > > > > +struct sched_pernet { > > > > + /* protects pernet updates */ > > > > + spinlock_t lock; > > > > + struct list_head sched_list; > > > > +}; > > > > + > > > > +static struct sched_pernet *sched_get_pernet(const struct net *net) > > > > +{ > > > > + return net_generic(net, sched_pernet_id); > > > > +} > > > > + > > > > +struct mptcp_sched_ops *mptcp_sched_find(const struct net *net, > > > > + const char *name) > > > > +{ > > > > + struct sched_pernet *pernet = sched_get_pernet(net); > > > > + struct mptcp_sched_ops *sched, *ret = NULL; > > > > + > > > > + spin_lock(&pernet->lock); > > > > + list_for_each_entry_rcu(sched, &pernet->sched_list, list) { > > > > + if (!strcmp(sched->name, name)) { > > > > + ret = sched; > > > > + break; > > > > + } > > > > + } > > > > + spin_unlock(&pernet->lock); > > > > + > > > > + return ret; > > > > +} > > > > + > > > > +int mptcp_register_scheduler(const struct net *net, > > > > + struct mptcp_sched_ops *sched) > > > > +{ > > > > + struct sched_pernet *pernet = sched_get_pernet(net); > > > > + > > > > + if (!sched->get_subflow) > > > > + return -EINVAL; > > > > Should also validate sched->name, don't want to allow a NULL pointer there. > > Oops, never mind - name is an array, not a pointer! > > > > > + > > > > + if (mptcp_sched_find(net, sched->name)) > > > > + return -EEXIST; > > > > + > > > > + spin_lock(&pernet->lock); > > > > + list_add_tail_rcu(&sched->list, &pernet->sched_list); > > > > + spin_unlock(&pernet->lock); > > > > + > > > > + pr_debug("%s registered", sched->name); > > > > + return 0; > > > > +} > > > > + > > > > +void mptcp_unregister_scheduler(const struct net *net, > > > > + struct mptcp_sched_ops *sched) > > > > +{ > > > > + struct sched_pernet *pernet = sched_get_pernet(net); > > > > + > > > > + spin_lock(&pernet->lock); > > > > + list_del_rcu(&sched->list); > > > > + spin_unlock(&pernet->lock); > > > > + > > > > + synchronize_rcu(); > > > > +} > > > > + > > > > +static int __net_init sched_init_net(struct net *net) > > > > +{ > > > > + struct sched_pernet *pernet = sched_get_pernet(net); > > > > + > > > > + INIT_LIST_HEAD_RCU(&pernet->sched_list); > > > > + spin_lock_init(&pernet->lock); > > > > + > > > > + return 0; > > > > +} > > > > + > > > > +static void __net_exit sched_exit_net(struct net *net) > > > > +{ > > > > + struct sched_pernet *pernet = sched_get_pernet(net); > > > > + struct mptcp_sched_ops *sched; > > > > + > > > > + spin_lock(&pernet->lock); > > > > + list_for_each_entry_rcu(sched, &pernet->sched_list, list) > > > > + list_del_rcu(&sched->list); > > > > + spin_unlock(&pernet->lock); > > > > + > > > > + synchronize_rcu(); > > > > +} > > > > + > > > > +static struct pernet_operations mptcp_sched_pernet_ops = { > > > > + .init = sched_init_net, > > > > + .exit = sched_exit_net, > > > > + .id = &sched_pernet_id, > > > > + .size = sizeof(struct sched_pernet), > > > > +}; > > > > + > > > > +void mptcp_sched_init(void) > > > > +{ > > > > + if (register_pernet_subsys(&mptcp_sched_pernet_ops) < 0) > > > > + panic("Failed to register MPTCP sched pernet subsystem.\n"); > > > > +} > > > > -- > > Mat Martineau > > Intel > > > > > > -- > Mat Martineau > Intel >