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-rw-r--r--net/packet/af_packet.c38
-rw-r--r--net/packet/internal.h1
2 files changed, 32 insertions, 7 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index ffa67205f698..3a383fd72f82 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1265,14 +1265,14 @@ static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)
return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
}
-static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
+static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
{
struct sock *sk = &po->sk;
int ret = ROOM_NONE;
if (po->prot_hook.func != tpacket_rcv) {
int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)
- - skb->truesize;
+ - (skb ? skb->truesize : 0);
if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF))
return ROOM_NORMAL;
else if (avail > 0)
@@ -1281,7 +1281,6 @@ static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
return ROOM_NONE;
}
- spin_lock(&sk->sk_receive_queue.lock);
if (po->tp_version == TPACKET_V3) {
if (__tpacket_v3_has_room(po, ROOM_POW_OFF))
ret = ROOM_NORMAL;
@@ -1293,7 +1292,26 @@ static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
else if (__tpacket_has_room(po, 0))
ret = ROOM_LOW;
}
- spin_unlock(&sk->sk_receive_queue.lock);
+
+ return ret;
+}
+
+static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
+{
+ int ret;
+ bool has_room;
+
+ if (po->prot_hook.func == tpacket_rcv) {
+ spin_lock(&po->sk.sk_receive_queue.lock);
+ ret = __packet_rcv_has_room(po, skb);
+ spin_unlock(&po->sk.sk_receive_queue.lock);
+ } else {
+ ret = __packet_rcv_has_room(po, skb);
+ }
+
+ has_room = ret == ROOM_NORMAL;
+ if (po->pressure == has_room)
+ xchg(&po->pressure, !has_room);
return ret;
}
@@ -1362,7 +1380,7 @@ static unsigned int fanout_demux_rollover(struct packet_fanout *f,
unsigned int idx, bool try_self,
unsigned int num)
{
- struct packet_sock *po;
+ struct packet_sock *po, *po_next;
unsigned int i, j;
po = pkt_sk(f->arr[idx]);
@@ -1371,8 +1389,9 @@ static unsigned int fanout_demux_rollover(struct packet_fanout *f,
i = j = min_t(int, po->rollover->sock, num - 1);
do {
- if (i != idx &&
- packet_rcv_has_room(pkt_sk(f->arr[i]), skb) == ROOM_NORMAL) {
+ po_next = pkt_sk(f->arr[i]);
+ if (po_next != po && !po_next->pressure &&
+ packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
if (i != j)
po->rollover->sock = i;
return i;
@@ -3000,6 +3019,9 @@ static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
if (skb == NULL)
goto out;
+ if (pkt_sk(sk)->pressure)
+ packet_rcv_has_room(pkt_sk(sk), NULL);
+
if (pkt_sk(sk)->has_vnet_hdr) {
struct virtio_net_hdr vnet_hdr = { 0 };
@@ -3755,6 +3777,8 @@ static unsigned int packet_poll(struct file *file, struct socket *sock,
TP_STATUS_KERNEL))
mask |= POLLIN | POLLRDNORM;
}
+ if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
+ xchg(&po->pressure, 0);
spin_unlock_bh(&sk->sk_receive_queue.lock);
spin_lock_bh(&sk->sk_write_queue.lock);
if (po->tx_ring.pg_vec) {
diff --git a/net/packet/internal.h b/net/packet/internal.h
index a9d33a28a019..22d7d778c5b7 100644
--- a/net/packet/internal.h
+++ b/net/packet/internal.h
@@ -105,6 +105,7 @@ struct packet_sock {
auxdata:1,
origdev:1,
has_vnet_hdr:1;
+ int pressure;
int ifindex; /* bound device */
__be16 num;
struct packet_rollover *rollover;