From 704cf3437fb6f50c6a38f425308207e960835404 Mon Sep 17 00:00:00 2001 From: Geliang Tang Date: Sat, 7 Dec 2024 09:07:27 +0800 Subject: [PATCH] mptcp: reuse sending nlmsg code in dump_addr A new type mptcp_pm_addr_id_bitmap_t is defined to easily modify dump_addr() interface of the path managers to accept an id_bitmap type parameter. It also allows this parameter of dump_addr() can be modified by BPF program when implementing this interface of a BFP path manager. With the help of get_addr(), we can modify dump_addr() interfaces to reuse send_nlmsg code between the netlink PM and userspace PM. The current dump_addr() flow looks like this: lock(); for_each_entry(entry) send_nlmsg(entry); unlock(); After holding the lock, get every entry by walking the address list, send each one looply, and finally release the lock. This set changes the process by copying the address list to an id bitmap while holding the lock, then release the lock immediately. After that, without locking, walking the copied id bitmap to get every copy of entry by using get_addr(), and send each one looply: lock(); for_each_entry(entry) set_bit(bitmap); unlock(); for_each_bit(bitmap) { copy = get_addr(); send_nlmsg(copy); } With this, we can reuse the send_nlmsg() code in dump_addr() interfaces between the netlink PM and userspace PM. They only need to implement their own dump_addr() interfaces to hold the different locks, copy the different address lists to an id bitmap, then release the locks. Signed-off-by: Geliang Tang --- include/net/mptcp.h | 7 +++++++ net/mptcp/pm.c | 42 +++++++++++++++++++++++++++++++++++---- net/mptcp/pm_netlink.c | 35 +++----------------------------- net/mptcp/pm_userspace.c | 43 ++++++++++++++-------------------------- net/mptcp/protocol.h | 9 ++------- 5 files changed, 65 insertions(+), 71 deletions(-) diff --git a/include/net/mptcp.h b/include/net/mptcp.h index 814b5f2e3ed5e3..220b1f60e8c16f 100644 --- a/include/net/mptcp.h +++ b/include/net/mptcp.h @@ -120,6 +120,13 @@ struct mptcp_sched_ops { void (*release)(struct mptcp_sock *msk); } ____cacheline_aligned_in_smp; +/* max value of mptcp_addr_info.id */ +#define MPTCP_PM_MAX_ADDR_ID U8_MAX + +typedef struct { + DECLARE_BITMAP(map, MPTCP_PM_MAX_ADDR_ID + 1); +} mptcp_pm_addr_id_bitmap_t; + #ifdef CONFIG_MPTCP void mptcp_init(void); diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c index 0aaf16319c3437..b862a8e4c70668 100644 --- a/net/mptcp/pm.c +++ b/net/mptcp/pm.c @@ -485,20 +485,54 @@ int mptcp_pm_nl_get_addr_doit(struct sk_buff *skb, struct genl_info *info) return ret; } -static int mptcp_pm_dump_addr(struct sk_buff *msg, struct netlink_callback *cb, +static int mptcp_pm_dump_addr(mptcp_pm_addr_id_bitmap_t *bitmap, const struct genl_info *info) { if (info->attrs[MPTCP_PM_ATTR_TOKEN]) - return mptcp_userspace_pm_dump_addr(msg, cb, info); - return mptcp_pm_nl_dump_addr(msg, cb, info); + return mptcp_userspace_pm_dump_addr(bitmap, info); + return mptcp_pm_nl_dump_addr(bitmap, info); } int mptcp_pm_nl_get_addr_dumpit(struct sk_buff *msg, struct netlink_callback *cb) { const struct genl_info *info = genl_info_dump(cb); + mptcp_pm_addr_id_bitmap_t *bitmap; + struct mptcp_pm_addr_entry entry; + int id = cb->args[0]; + void *hdr; + int i; - return mptcp_pm_dump_addr(msg, cb, info); + bitmap = (mptcp_pm_addr_id_bitmap_t *)cb->ctx; + + mptcp_pm_dump_addr(bitmap, info); + + for (i = id; i < MPTCP_PM_MAX_ADDR_ID + 1; i++) { + if (test_bit(i, bitmap->map)) { + if (mptcp_pm_get_addr(i, &entry, info)) + break; + + if (id && entry.addr.id <= id) + continue; + + hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, &mptcp_genl_family, + NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR); + if (!hdr) + break; + + if (mptcp_nl_fill_addr(msg, &entry) < 0) { + genlmsg_cancel(msg, hdr); + break; + } + + id = entry.addr.id; + genlmsg_end(msg, hdr); + } + } + + cb->args[0] = id; + return msg->len; } static int mptcp_pm_set_flags(struct sk_buff *skb, struct genl_info *info) diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index 0d826bfc471837..831c440d6cc527 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -1783,48 +1783,19 @@ int mptcp_pm_nl_get_addr(u8 id, struct mptcp_pm_addr_entry *addr, return ret; } -int mptcp_pm_nl_dump_addr(struct sk_buff *msg, - struct netlink_callback *cb, +int mptcp_pm_nl_dump_addr(mptcp_pm_addr_id_bitmap_t *bitmap, const struct genl_info *info) { struct net *net = genl_info_net(info); - struct mptcp_pm_addr_entry *entry; struct pm_nl_pernet *pernet; - int id = cb->args[0]; - void *hdr; - int i; pernet = pm_nl_get_pernet(net); rcu_read_lock(); - for (i = id; i < MPTCP_PM_MAX_ADDR_ID + 1; i++) { - if (test_bit(i, pernet->id_bitmap)) { - entry = __lookup_addr_by_id(pernet, i); - if (!entry) - break; - - if (entry->addr.id <= id) - continue; - - hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, - cb->nlh->nlmsg_seq, &mptcp_genl_family, - NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR); - if (!hdr) - break; - - if (mptcp_nl_fill_addr(msg, entry) < 0) { - genlmsg_cancel(msg, hdr); - break; - } - - id = entry->addr.id; - genlmsg_end(msg, hdr); - } - } + bitmap_copy(bitmap->map, pernet->id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); rcu_read_unlock(); - cb->args[0] = id; - return msg->len; + return 0; } static int parse_limit(struct genl_info *info, int id, unsigned int *limit) diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c index 7dc417255e8f19..dd6a1f62c2686f 100644 --- a/net/mptcp/pm_userspace.c +++ b/net/mptcp/pm_userspace.c @@ -614,20 +614,25 @@ int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info) return ret; } -int mptcp_userspace_pm_dump_addr(struct sk_buff *msg, - struct netlink_callback *cb, - const struct genl_info *info) +static int mptcp_userspace_pm_reset_bitmap(struct mptcp_sock *msk, + mptcp_pm_addr_id_bitmap_t *bitmap) { - struct id_bitmap { - DECLARE_BITMAP(map, MPTCP_PM_MAX_ADDR_ID + 1); - } *bitmap; struct mptcp_pm_addr_entry *entry; + + bitmap_zero(bitmap->map, MPTCP_PM_MAX_ADDR_ID + 1); + + mptcp_for_each_userspace_pm_addr(msk, entry) + __set_bit(entry->addr.id, bitmap->map); + + return 0; +} + +int mptcp_userspace_pm_dump_addr(mptcp_pm_addr_id_bitmap_t *bitmap, + const struct genl_info *info) +{ struct mptcp_sock *msk; int ret = -EINVAL; struct sock *sk; - void *hdr; - - bitmap = (struct id_bitmap *)cb->ctx; msk = mptcp_userspace_pm_get_sock(info); if (!msk) @@ -637,27 +642,9 @@ int mptcp_userspace_pm_dump_addr(struct sk_buff *msg, lock_sock(sk); spin_lock_bh(&msk->pm.lock); - mptcp_for_each_userspace_pm_addr(msk, entry) { - if (test_bit(entry->addr.id, bitmap->map)) - continue; - - hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, - cb->nlh->nlmsg_seq, &mptcp_genl_family, - NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR); - if (!hdr) - break; - - if (mptcp_nl_fill_addr(msg, entry) < 0) { - genlmsg_cancel(msg, hdr); - break; - } - - __set_bit(entry->addr.id, bitmap->map); - genlmsg_end(msg, hdr); - } + ret = mptcp_userspace_pm_reset_bitmap(msk, bitmap); spin_unlock_bh(&msk->pm.lock); release_sock(sk); - ret = msg->len; sock_put(sk); return ret; diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 1f9c66f53865ee..ed629320ba5660 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -208,9 +208,6 @@ enum mptcp_addr_signal_status { MPTCP_RM_ADDR_SIGNAL, }; -/* max value of mptcp_addr_info.id */ -#define MPTCP_PM_MAX_ADDR_ID U8_MAX - struct mptcp_pm_data { struct mptcp_addr_info local; struct mptcp_addr_info remote; @@ -1127,11 +1124,9 @@ int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_in bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc); bool mptcp_pm_nl_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc); bool mptcp_userspace_pm_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc); -int mptcp_pm_nl_dump_addr(struct sk_buff *msg, - struct netlink_callback *cb, +int mptcp_pm_nl_dump_addr(mptcp_pm_addr_id_bitmap_t *bitmap, const struct genl_info *info); -int mptcp_userspace_pm_dump_addr(struct sk_buff *msg, - struct netlink_callback *cb, +int mptcp_userspace_pm_dump_addr(mptcp_pm_addr_id_bitmap_t *bitmap, const struct genl_info *info); int mptcp_pm_nl_get_addr(u8 id, struct mptcp_pm_addr_entry *addr, const struct genl_info *info);