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batman-adv: restructure rebroadcast counter into forw_packet API

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This patch refactors the num_packets counter of a forw_packet in the
following three ways:

1) Removed dual-use of forw_packet::num_packets:
   -> now for aggregation purposes only
2) Using forw_packet::skb::cb::num_bcasts instead:
   -> for easier access in aggregation code later
3) make access to num_bcasts private to batadv_forw_packet_*()

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
[sven@narfation.org: Change num_bcasts to unsigned]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Linus Lüssing 2017-02-17 11:17:07 +01:00 committed by Simon Wunderlich
parent 99ba18ef02
commit e2d9ba4355
6 changed files with 63 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/batman-adv/distributed-arp-table.c
View File

@ -1303,7 +1303,7 @@ bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
/* If this packet is an ARP_REQUEST and the node already has the
* information that it is going to ask, then the packet can be dropped
*/
if (forw_packet->num_packets)
if (batadv_forw_packet_is_rebroadcast(forw_packet))
goto out;
vid = batadv_dat_get_vid(forw_packet->skb, &hdr_size);

3
net/batman-adv/main.c
View File

@ -516,6 +516,9 @@ static void batadv_recv_handler_init(void)
BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12);
BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8);
i = FIELD_SIZEOF(struct sk_buff, cb);
BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i);
/* broadcast packet */
batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;

55
net/batman-adv/send.c
View File

@ -789,6 +789,55 @@ err:
return NETDEV_TX_BUSY;
}
/**
* batadv_forw_packet_bcasts_left - check if a retransmission is necessary
* @forw_packet: the forwarding packet to check
* @hard_iface: the interface to check on
*
* Checks whether a given packet has any (re)transmissions left on the provided
* interface.
*
* hard_iface may be NULL: In that case the number of transmissions this skb had
* so far is compared with the maximum amount of retransmissions independent of
* any interface instead.
*
* Return: True if (re)transmissions are left, false otherwise.
*/
static bool
batadv_forw_packet_bcasts_left(struct batadv_forw_packet *forw_packet,
struct batadv_hard_iface *hard_iface)
{
unsigned int max;
if (hard_iface)
max = hard_iface->num_bcasts;
else
max = BATADV_NUM_BCASTS_MAX;
return BATADV_SKB_CB(forw_packet->skb)->num_bcasts < max;
}
/**
* batadv_forw_packet_bcasts_inc - increment retransmission counter of a packet
* @forw_packet: the packet to increase the counter for
*/
static void
batadv_forw_packet_bcasts_inc(struct batadv_forw_packet *forw_packet)
{
BATADV_SKB_CB(forw_packet->skb)->num_bcasts++;
}
/**
* batadv_forw_packet_is_rebroadcast - check packet for previous transmissions
* @forw_packet: the packet to check
*
* Return: True if this packet was transmitted before, false otherwise.
*/
bool batadv_forw_packet_is_rebroadcast(struct batadv_forw_packet *forw_packet)
{
return BATADV_SKB_CB(forw_packet->skb)->num_bcasts > 0;
}
static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
{
struct batadv_hard_iface *hard_iface;
@ -829,7 +878,7 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
if (hard_iface->soft_iface != soft_iface)
continue;
if (forw_packet->num_packets >= hard_iface->num_bcasts)
if (!batadv_forw_packet_bcasts_left(forw_packet, hard_iface))
continue;
if (forw_packet->own) {
@ -887,10 +936,10 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
}
rcu_read_unlock();
forw_packet->num_packets++;
batadv_forw_packet_bcasts_inc(forw_packet);
/* if we still have some more bcasts to send */
if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) {
if (batadv_forw_packet_bcasts_left(forw_packet, NULL)) {
batadv_forw_packet_bcast_queue(bat_priv, forw_packet,
send_time);
return;

1
net/batman-adv/send.h
View File

@ -40,6 +40,7 @@ bool batadv_forw_packet_steal(struct batadv_forw_packet *packet, spinlock_t *l);
void batadv_forw_packet_ogmv1_queue(struct batadv_priv *bat_priv,
struct batadv_forw_packet *forw_packet,
unsigned long send_time);
bool batadv_forw_packet_is_rebroadcast(struct batadv_forw_packet *forw_packet);
int batadv_send_skb_to_orig(struct sk_buff *skb,
struct batadv_orig_node *orig_node,

3
net/batman-adv/soft-interface.c
View File

@ -230,6 +230,9 @@ static int batadv_interface_tx(struct sk_buff *skb,
if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
goto dropped;
/* reset control block to avoid left overs from previous users */
memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
netif_trans_update(soft_iface);
vid = batadv_get_vid(skb, 0);
ethhdr = eth_hdr(skb);

4
net/batman-adv/types.h
View File

@ -1377,9 +1377,11 @@ struct batadv_nc_packet {
* relevant to batman-adv in the skb->cb buffer in skbs.
* @decoded: Marks a skb as decoded, which is checked when searching for coding
* opportunities in network-coding.c
* @num_bcasts: Counter for broadcast packet retransmissions
*/
struct batadv_skb_cb {
bool decoded;
unsigned int num_bcasts;
};
/**
@ -1392,7 +1394,7 @@ struct batadv_skb_cb {
* @skb: bcast packet's skb buffer
* @packet_len: size of aggregated OGM packet inside the skb buffer
* @direct_link_flags: direct link flags for aggregated OGM packets
* @num_packets: counter for bcast packet retransmission
* @num_packets: counter for aggregated OGMv1 packets
* @delayed_work: work queue callback item for packet sending
* @if_incoming: pointer to incoming hard-iface or primary iface if
* locally generated packet