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net/packet: convert po->running to an atomic flag

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Instead of consuming 32 bits for po->running, use
one available bit in po->flags.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-03-16 01:10:13 +00:00 committed by David S. Miller
parent 50d935eafe
commit 61edf47981
3 changed files with 12 additions and 12 deletions
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20
net/packet/af_packet.c
View File

@ -340,14 +340,14 @@ static void __register_prot_hook(struct sock *sk)
{
struct packet_sock *po = pkt_sk(sk);
if (!po->running) {
if (!packet_sock_flag(po, PACKET_SOCK_RUNNING)) {
if (po->fanout)
__fanout_link(sk, po);
else
dev_add_pack(&po->prot_hook);
sock_hold(sk);
po->running = 1;
packet_sock_flag_set(po, PACKET_SOCK_RUNNING, 1);
}
}
@ -369,7 +369,7 @@ static void __unregister_prot_hook(struct sock *sk, bool sync)
lockdep_assert_held_once(&po->bind_lock);
po->running = 0;
packet_sock_flag_set(po, PACKET_SOCK_RUNNING, 0);
if (po->fanout)
__fanout_unlink(sk, po);
@ -389,7 +389,7 @@ static void unregister_prot_hook(struct sock *sk, bool sync)
{
struct packet_sock *po = pkt_sk(sk);
if (po->running)
if (packet_sock_flag(po, PACKET_SOCK_RUNNING))
__unregister_prot_hook(sk, sync);
}
@ -1782,7 +1782,7 @@ static int fanout_add(struct sock *sk, struct fanout_args *args)
err = -EINVAL;
spin_lock(&po->bind_lock);
if (po->running &&
if (packet_sock_flag(po, PACKET_SOCK_RUNNING) &&
match->type == type &&
match->prot_hook.type == po->prot_hook.type &&
match->prot_hook.dev == po->prot_hook.dev) {
@ -3222,7 +3222,7 @@ static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
if (need_rehook) {
dev_hold(dev);
if (po->running) {
if (packet_sock_flag(po, PACKET_SOCK_RUNNING)) {
rcu_read_unlock();
/* prevents packet_notifier() from calling
* register_prot_hook()
@ -3235,7 +3235,7 @@ static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
dev->ifindex);
}
BUG_ON(po->running);
BUG_ON(packet_sock_flag(po, PACKET_SOCK_RUNNING));
WRITE_ONCE(po->num, proto);
po->prot_hook.type = proto;
@ -4159,7 +4159,7 @@ static int packet_notifier(struct notifier_block *this,
case NETDEV_DOWN:
if (dev->ifindex == po->ifindex) {
spin_lock(&po->bind_lock);
if (po->running) {
if (packet_sock_flag(po, PACKET_SOCK_RUNNING)) {
__unregister_prot_hook(sk, false);
sk->sk_err = ENETDOWN;
if (!sock_flag(sk, SOCK_DEAD))
@ -4470,7 +4470,7 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
/* Detach socket from network */
spin_lock(&po->bind_lock);
was_running = po->running;
was_running = packet_sock_flag(po, PACKET_SOCK_RUNNING);
num = po->num;
if (was_running) {
WRITE_ONCE(po->num, 0);
@ -4681,7 +4681,7 @@ static int packet_seq_show(struct seq_file *seq, void *v)
s->sk_type,
ntohs(READ_ONCE(po->num)),
READ_ONCE(po->ifindex),
po->running,
packet_sock_flag(po, PACKET_SOCK_RUNNING),
atomic_read(&s->sk_rmem_alloc),
from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
sock_i_ino(s));

2
net/packet/diag.c
View File

@ -21,7 +21,7 @@ static int pdiag_put_info(const struct packet_sock *po, struct sk_buff *nlskb)
pinfo.pdi_tstamp = READ_ONCE(po->tp_tstamp);
pinfo.pdi_flags = 0;
if (po->running)
if (packet_sock_flag(po, PACKET_SOCK_RUNNING))
pinfo.pdi_flags |= PDI_RUNNING;
if (packet_sock_flag(po, PACKET_SOCK_AUXDATA))
pinfo.pdi_flags |= PDI_AUXDATA;

2
net/packet/internal.h
View File

@ -117,7 +117,6 @@ struct packet_sock {
spinlock_t bind_lock;
struct mutex pg_vec_lock;
unsigned long flags;
unsigned int running; /* bind_lock must be held */
int pressure;
int ifindex; /* bound device */
__be16 num;
@ -146,6 +145,7 @@ enum packet_sock_flags {
PACKET_SOCK_TX_HAS_OFF,
PACKET_SOCK_TP_LOSS,
PACKET_SOCK_HAS_VNET_HDR,
PACKET_SOCK_RUNNING,
};
static inline void packet_sock_flag_set(struct packet_sock *po,