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xsk, net: Make sock_def_readable() have external linkage 

XDP sockets use the default implementation of struct sock's
sk_data_ready callback, which is sock_def_readable(). This function
is called in the XDP socket fast-path, and involves a retpoline. By
letting sock_def_readable() have external linkage, and being called
directly, the retpoline can be avoided.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200120092917.13949-1-bjorn.topel@gmail.com
alistair/sensors
Björn Töpel 2020-01-20 10:29:17 +01:00 committed by Daniel Borkmann
parent b87121dd3f
commit 43a825afc9
3 changed files with 4 additions and 2 deletions
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2
include/net/sock.h
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@ -2612,4 +2612,6 @@ static inline bool sk_dev_equal_l3scope(struct sock *sk, int dif)
return false;
}
void sock_def_readable(struct sock *sk);
#endif /* _SOCK_H */

2
net/core/sock.c
View File

@ -2786,7 +2786,7 @@ static void sock_def_error_report(struct sock *sk)
rcu_read_unlock();
}
static void sock_def_readable(struct sock *sk)
void sock_def_readable(struct sock *sk)
{
struct socket_wq *wq;

2
net/xdp/xsk.c
View File

@ -217,7 +217,7 @@ static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
static void xsk_flush(struct xdp_sock *xs)
{
xskq_prod_submit(xs->rx);
xs->sk.sk_data_ready(&xs->sk);
sock_def_readable(&xs->sk);
}
int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)