This patch abstracts the forward packet creation and destruction via
the new functions batadv_forw_packet_alloc() and batadv_forw_packet_free().
This should simplify the freeing of a forward packet as for instance queue
counting is now done internally.
Signed-off-by: Linus Lüssing <linus.luessing(a)c0d3.blue>
---
Changelog v2:
* Rebase to current master
* Fixed typo: "ressources" vs. "resources"
* Moved forw_packet->num_packets initialization into forw_packet_alloc(), too
* Adjusted commit message
Zombie patch - rotten & dead since 2013, but w{al,or}ks again!
net/batman-adv/bat_iv_ogm.c | 34 ++++----------
net/batman-adv/send.c | 103 +++++++++++++++++++++++++++++++------------
net/batman-adv/send.h | 6 +++
net/batman-adv/types.h | 2 +
4 files changed, 92 insertions(+), 53 deletions(-)
diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index e2d8848..5a7923c 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -685,19 +685,12 @@ static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
struct batadv_forw_packet *forw_packet_aggr;
unsigned char *skb_buff;
unsigned int skb_size;
+ atomic_t *queue_left = own_packet ? NULL : &bat_priv->batman_queue_left;
- /* own packet should always be scheduled */
- if (!own_packet) {
- if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
- batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
- "batman packet queue full\n");
- return;
- }
- }
-
- forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
+ forw_packet_aggr = batadv_forw_packet_alloc(if_incoming, if_outgoing,
+ queue_left, bat_priv);
if (!forw_packet_aggr)
- goto out_nomem;
+ return;
if (atomic_read(&bat_priv->aggregated_ogms) &&
packet_len < BATADV_MAX_AGGREGATION_BYTES)
@@ -709,7 +702,8 @@ static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
if (!forw_packet_aggr->skb)
- goto out_free_forw_packet;
+ goto packet_free;
+
forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
@@ -717,12 +711,7 @@ static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
forw_packet_aggr->packet_len = packet_len;
memcpy(skb_buff, packet_buff, packet_len);
- kref_get(&if_incoming->refcount);
- kref_get(&if_outgoing->refcount);
forw_packet_aggr->own = own_packet;
- forw_packet_aggr->if_incoming = if_incoming;
- forw_packet_aggr->if_outgoing = if_outgoing;
- forw_packet_aggr->num_packets = 0;
forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
forw_packet_aggr->send_time = send_time;
@@ -743,11 +732,8 @@ static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
send_time - jiffies);
return;
-out_free_forw_packet:
- kfree(forw_packet_aggr);
-out_nomem:
- if (!own_packet)
- atomic_inc(&bat_priv->batman_queue_left);
+packet_free:
+ batadv_forw_packet_free(forw_packet_aggr);
}
/* aggregate a new packet into the existing ogm packet */
@@ -1830,10 +1816,6 @@ static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work)
batadv_iv_ogm_schedule(forw_packet->if_incoming);
out:
- /* don't count own packet */
- if (!forw_packet->own)
- atomic_inc(&bat_priv->batman_queue_left);
-
batadv_forw_packet_free(forw_packet);
}
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index 49836da..711f8a8 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -430,6 +430,13 @@ int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb,
orig_node, vid);
}
+/**
+ * batadv_forw_packet_free - free a forwarding packet
+ * @forw_packet: The packet to free
+ *
+ * This frees a forwarding packet and releases any resources it might
+ * have claimed.
+ */
void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet)
{
kfree_skb(forw_packet->skb);
@@ -437,9 +444,71 @@ void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet)
batadv_hardif_put(forw_packet->if_incoming);
if (forw_packet->if_outgoing)
batadv_hardif_put(forw_packet->if_outgoing);
+ if (forw_packet->queue_left)
+ atomic_inc(forw_packet->queue_left);
kfree(forw_packet);
}
+/**
+ * batadv_forw_packet_alloc - Allocates a forwarding packet
+ * @if_incoming: The (optional) if_incoming to be grabbed
+ * @if_outgoing: The (optional) if_outgoing to be grabbed
+ * @queue_left: The (optional) queue counter to decrease
+ * @bat_priv: The bat_priv for the mesh of this forw_packet
+ *
+ * Allocates a forwarding packet and tries to get a reference to the
+ * (optional) if_incoming and queue_left. If queue_left is NULL then
+ * bat_priv is optional, too.
+ *
+ * On success, returns the allocated forwarding packet. Otherwise returns
+ * NULL.
+ */
+struct batadv_forw_packet *
+batadv_forw_packet_alloc(struct batadv_hard_iface *if_incoming,
+ struct batadv_hard_iface *if_outgoing,
+ atomic_t *queue_left,
+ struct batadv_priv *bat_priv)
+{
+ struct batadv_forw_packet *forw_packet = NULL;
+
+ if (queue_left && !batadv_atomic_dec_not_zero(queue_left)) {
+ if (queue_left == &bat_priv->bcast_queue_left)
+ batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
+ "bcast queue full\n");
+ else if (queue_left == &bat_priv->batman_queue_left)
+ batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
+ "batman queue full\n");
+ else
+ batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
+ "a mysterious queue is full\n");
+ goto out;
+ }
+
+ forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
+ if (!forw_packet)
+ goto err;
+
+ if (if_incoming)
+ kref_get(&if_incoming->refcount);
+
+ if (if_outgoing)
+ kref_get(&if_outgoing->refcount);
+
+ forw_packet->skb = NULL;
+ forw_packet->queue_left = queue_left;
+ forw_packet->if_incoming = if_incoming;
+ forw_packet->if_outgoing = if_outgoing;
+ forw_packet->num_packets = 0;
+
+ goto out;
+
+err:
+ if (queue_left)
+ atomic_inc(queue_left);
+out:
+ return forw_packet;
+}
+
static void
_batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
struct batadv_forw_packet *forw_packet,
@@ -478,20 +547,16 @@ int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
struct batadv_bcast_packet *bcast_packet;
struct sk_buff *newskb;
- if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
- batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
- "bcast packet queue full\n");
- goto out;
- }
-
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if)
- goto out_and_inc;
-
- forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);
+ goto out;
+ forw_packet = batadv_forw_packet_alloc(primary_if, NULL,
+ &bat_priv->bcast_queue_left,
+ bat_priv);
+ batadv_hardif_put(primary_if);
if (!forw_packet)
- goto out_and_inc;
+ goto out;
newskb = skb_copy(skb, GFP_ATOMIC);
if (!newskb)
@@ -504,11 +569,6 @@ int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
skb_reset_mac_header(newskb);
forw_packet->skb = newskb;
- forw_packet->if_incoming = primary_if;
- forw_packet->if_outgoing = NULL;
-
- /* how often did we send the bcast packet ? */
- forw_packet->num_packets = 0;
INIT_DELAYED_WORK(&forw_packet->delayed_work,
batadv_send_outstanding_bcast_packet);
@@ -517,12 +577,8 @@ int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
return NETDEV_TX_OK;
packet_free:
- kfree(forw_packet);
-out_and_inc:
- atomic_inc(&bat_priv->bcast_queue_left);
+ batadv_forw_packet_free(forw_packet);
out:
- if (primary_if)
- batadv_hardif_put(primary_if);
return NETDEV_TX_BUSY;
}
@@ -583,7 +639,6 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
out:
batadv_forw_packet_free(forw_packet);
- atomic_inc(&bat_priv->bcast_queue_left);
}
void
@@ -624,9 +679,6 @@ batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
if (pending) {
hlist_del(&forw_packet->list);
- if (!forw_packet->own)
- atomic_inc(&bat_priv->bcast_queue_left);
-
batadv_forw_packet_free(forw_packet);
}
}
@@ -654,9 +706,6 @@ batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
if (pending) {
hlist_del(&forw_packet->list);
- if (!forw_packet->own)
- atomic_inc(&bat_priv->batman_queue_left);
-
batadv_forw_packet_free(forw_packet);
}
}
diff --git a/net/batman-adv/send.h b/net/batman-adv/send.h
index 7cecb75..999f786 100644
--- a/net/batman-adv/send.h
+++ b/net/batman-adv/send.h
@@ -28,6 +28,12 @@
struct sk_buff;
void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet);
+struct batadv_forw_packet *
+batadv_forw_packet_alloc(struct batadv_hard_iface *if_incoming,
+ struct batadv_hard_iface *if_outgoing,
+ atomic_t *queue_left,
+ struct batadv_priv *bat_priv);
+
int batadv_send_skb_to_orig(struct sk_buff *skb,
struct batadv_orig_node *orig_node,
struct batadv_hard_iface *recv_if);
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index a331e3a..b1b82a2 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -1373,6 +1373,7 @@ struct batadv_skb_cb {
* locally generated packet
* @if_outgoing: packet where the packet should be sent to, or NULL if
* unspecified
+ * @queue_left: The queue (counter) this packet was applied to
*/
struct batadv_forw_packet {
struct hlist_node list;
@@ -1385,6 +1386,7 @@ struct batadv_forw_packet {
struct delayed_work delayed_work;
struct batadv_hard_iface *if_incoming;
struct batadv_hard_iface *if_outgoing;
+ atomic_t *queue_left;
};
/**
--
1.7.10.4
