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mptcp: open code mptcp variant for lock_sock

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This allows invoking an additional callback under the
socket spin lock.

Will be used by the next patches to avoid additional
spin lock contention.

Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2020-11-27 11:10:22 +01:00 committed by Jakub Kicinski
parent be5724240b
commit ad80b0fc6e
3 changed files with 15 additions and 1 deletions
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1
include/net/sock.h
View file

@ -1590,6 +1590,7 @@ static inline void lock_sock(struct sock *sk)
lock_sock_nested(sk, 0);
}
void __lock_sock(struct sock *sk);
void __release_sock(struct sock *sk);
void release_sock(struct sock *sk);

2
net/core/sock.c
View file

@ -2486,7 +2486,7 @@ bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
}
EXPORT_SYMBOL(sk_page_frag_refill);
static void __lock_sock(struct sock *sk)
void __lock_sock(struct sock *sk)
__releases(&sk->sk_lock.slock)
__acquires(&sk->sk_lock.slock)
{

13
net/mptcp/protocol.h
View file

@ -253,6 +253,19 @@ struct mptcp_sock {
} rcvq_space;
};
#define mptcp_lock_sock(___sk, cb) do { \
struct sock *__sk = (___sk); /* silence macro reuse warning */ \
might_sleep(); \
spin_lock_bh(&__sk->sk_lock.slock); \
if (__sk->sk_lock.owned) \
__lock_sock(__sk); \
cb; \
__sk->sk_lock.owned = 1; \
spin_unlock(&__sk->sk_lock.slock); \
mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \
local_bh_enable(); \
} while (0)
#define mptcp_for_each_subflow(__msk, __subflow) \
list_for_each_entry(__subflow, &((__msk)->conn_list), node)