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net: lockless implementation of SO_BUSY_POLL, SO_PREFER_BUSY_POLL, SO_BUSY_POLL_BUDGET

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Setting sk->sk_ll_usec, sk_prefer_busy_poll and sk_busy_poll_budget
do not require the socket lock, readers are lockless anyway.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-09-21 20:28:14 +00:00 committed by David S. Miller
parent b120251590
commit 2a4319cf3c
1 changed files with 20 additions and 24 deletions
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44
net/core/sock.c
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@ -1140,6 +1140,26 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
case SO_DOMAIN:
case SO_ERROR:
return -ENOPROTOOPT;
#ifdef CONFIG_NET_RX_BUSY_POLL
case SO_BUSY_POLL:
if (val < 0)
return -EINVAL;
WRITE_ONCE(sk->sk_ll_usec, val);
return 0;
case SO_PREFER_BUSY_POLL:
if (valbool && !sockopt_capable(CAP_NET_ADMIN))
return -EPERM;
WRITE_ONCE(sk->sk_prefer_busy_poll, valbool);
return 0;
case SO_BUSY_POLL_BUDGET:
if (val > READ_ONCE(sk->sk_busy_poll_budget) &&
!sockopt_capable(CAP_NET_ADMIN))
return -EPERM;
if (val < 0 || val > U16_MAX)
return -EINVAL;
WRITE_ONCE(sk->sk_busy_poll_budget, val);
return 0;
#endif
}
sockopt_lock_sock(sk);
@ -1402,30 +1422,6 @@ set_sndbuf:
sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
break;
#ifdef CONFIG_NET_RX_BUSY_POLL
case SO_BUSY_POLL:
if (val < 0)
ret = -EINVAL;
else
WRITE_ONCE(sk->sk_ll_usec, val);
break;
case SO_PREFER_BUSY_POLL:
if (valbool && !sockopt_capable(CAP_NET_ADMIN))
ret = -EPERM;
else
WRITE_ONCE(sk->sk_prefer_busy_poll, valbool);
break;
case SO_BUSY_POLL_BUDGET:
if (val > READ_ONCE(sk->sk_busy_poll_budget) && !sockopt_capable(CAP_NET_ADMIN)) {
ret = -EPERM;
} else {
if (val < 0 || val > U16_MAX)
ret = -EINVAL;
else
WRITE_ONCE(sk->sk_busy_poll_budget, val);
}
break;
#endif
case SO_MAX_PACING_RATE:
{