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Date: Thu, 16 Mar 2023 01:10:13 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, Willem de Bruijn <willemb@...gle.com>,
eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 8/9] net/packet: convert po->running to an atomic flag
Instead of consuming 32 bits for po->running, use
one available bit in po->flags.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
net/packet/af_packet.c | 20 ++++++++++----------
net/packet/diag.c | 2 +-
net/packet/internal.h | 2 +-
3 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 5a6b05e17ca214e1faeac201e647e0d34686c89a..ec446452bbe8d1b140b551006a3b2c9e5bace787 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -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));
diff --git a/net/packet/diag.c b/net/packet/diag.c
index 56240aaf032b25fdbbaf2ed6421cdbcc3669d1ec..de4ced5cf3e8c5798530ab3bfbe162cc3913b318 100644
--- a/net/packet/diag.c
+++ b/net/packet/diag.c
@@ -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;
diff --git a/net/packet/internal.h b/net/packet/internal.h
index 2521176807f4f8ba430c5a94c7c50a0372b1a92a..58f042c631723118b4b2115142b37b828a4d9e9f 100644
--- a/net/packet/internal.h
+++ b/net/packet/internal.h
@@ -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,
--
2.40.0.rc2.332.ga46443480c-goog
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