[PATCH mptcp-next v4 0/7] BPF path manager, part 1

[Geliang Tang <geliang@kernel.org>]

From: Geliang Tang <tanggeliang@kylinos.cn>

v4:
 - #4 drop "/* Called from the in-kernel PM only */" commend too.
 - #5 drop 'out' label and if-statement in mptcp_pm_remove_addr_entry.
 - drop #6 and #7.
 - the last patch, add 'release_sock' label as Matt suggested.

v3:
 - address Matt's comments in v2 (thanks)
 - only include cleanups and refactoring patches in this set.

v2:
 - add BPF-related code in this set (32-36).

In order to implement BPF userspace path manager, it is necessary to
unify the interfaces of the path manager. This set contains some
cleanups and refactoring to unify the interfaces in kernel space.
Finally, define a struct mptcp_pm_ops for a userspace path manager
like this:

struct mptcp_pm_ops {
        int (*address_announce)(struct mptcp_sock *msk,
                                struct mptcp_pm_addr_entry *local);
        int (*address_remove)(struct mptcp_sock *msk, u8 id);
        int (*subflow_create)(struct mptcp_sock *msk,
                              struct mptcp_pm_addr_entry *local,
                              struct mptcp_addr_info *remote);
        int (*subflow_destroy)(struct mptcp_sock *msk,
                               struct mptcp_pm_addr_entry *local,
                               struct mptcp_addr_info *remote);
        int (*get_local_id)(struct mptcp_sock *msk,
                            struct mptcp_pm_addr_entry *local);
        u8 (*get_flags)(struct mptcp_sock *msk,
                        struct mptcp_addr_info *skc);
        struct mptcp_pm_addr_entry *(*get_addr)(struct mptcp_sock *msk,
                                                u8 id);
	int (*dump_addr)(struct mptcp_sock *msk,
			 mptcp_pm_addr_id_bitmap_t *bitmap);
        int (*set_flags)(struct mptcp_sock *msk,
                         struct mptcp_pm_addr_entry *local,
                         struct mptcp_addr_info *remote);

        u8                      type;
        struct module           *owner;
        struct list_head        list;

        void (*init)(struct mptcp_sock *msk);
        void (*release)(struct mptcp_sock *msk);
} ____cacheline_aligned_in_smp;

Link: https://github.com/multipath-tcp/mptcp_net-next/issues/74

Geliang Tang (7):
  mptcp: add mptcp_userspace_pm_lookup_addr helper
  mptcp: add mptcp_for_each_userspace_pm_addr macro
  mptcp: add mptcp_userspace_pm_get_sock helper
  mptcp: move mptcp_pm_remove_addrs into pm_userspace
  mptcp: drop free_list for deleting entries
  mptcp: change local addr type of subflow_destroy
  mptcp: drop useless "err = 0" in subflow_destroy

 net/mptcp/pm_netlink.c   |  46 ++----
 net/mptcp/pm_userspace.c | 296 +++++++++++++++++----------------------
 net/mptcp/protocol.h     |   7 +-
 3 files changed, 146 insertions(+), 203 deletions(-)

-- 
2.45.2