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Diffstat (limited to 'drivers/staging/batman-adv/aggregation.c')
-rw-r--r--drivers/staging/batman-adv/aggregation.c275
1 files changed, 0 insertions, 275 deletions
diff --git a/drivers/staging/batman-adv/aggregation.c b/drivers/staging/batman-adv/aggregation.c
deleted file mode 100644
index 08624d44e23..00000000000
--- a/drivers/staging/batman-adv/aggregation.c
+++ /dev/null
@@ -1,275 +0,0 @@
-/*
- * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
- *
- * Marek Lindner, Simon Wunderlich
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA
- *
- */
-
-#include "main.h"
-#include "aggregation.h"
-#include "send.h"
-#include "routing.h"
-
-/* calculate the size of the hna information for a given packet */
-static int hna_len(struct batman_packet *batman_packet)
-{
- return batman_packet->num_hna * ETH_ALEN;
-}
-
-/* return true if new_packet can be aggregated with forw_packet */
-static bool can_aggregate_with(struct batman_packet *new_batman_packet,
- int packet_len,
- unsigned long send_time,
- bool directlink,
- struct batman_if *if_incoming,
- struct forw_packet *forw_packet)
-{
- struct batman_packet *batman_packet =
- (struct batman_packet *)forw_packet->skb->data;
- int aggregated_bytes = forw_packet->packet_len + packet_len;
-
- /**
- * we can aggregate the current packet to this aggregated packet
- * if:
- *
- * - the send time is within our MAX_AGGREGATION_MS time
- * - the resulting packet wont be bigger than
- * MAX_AGGREGATION_BYTES
- */
-
- if (time_before(send_time, forw_packet->send_time) &&
- time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS),
- forw_packet->send_time) &&
- (aggregated_bytes <= MAX_AGGREGATION_BYTES)) {
-
- /**
- * check aggregation compatibility
- * -> direct link packets are broadcasted on
- * their interface only
- * -> aggregate packet if the current packet is
- * a "global" packet as well as the base
- * packet
- */
-
- /* packets without direct link flag and high TTL
- * are flooded through the net */
- if ((!directlink) &&
- (!(batman_packet->flags & DIRECTLINK)) &&
- (batman_packet->ttl != 1) &&
-
- /* own packets originating non-primary
- * interfaces leave only that interface */
- ((!forw_packet->own) ||
- (forw_packet->if_incoming->if_num == 0)))
- return true;
-
- /* if the incoming packet is sent via this one
- * interface only - we still can aggregate */
- if ((directlink) &&
- (new_batman_packet->ttl == 1) &&
- (forw_packet->if_incoming == if_incoming) &&
-
- /* packets from direct neighbors or
- * own secondary interface packets
- * (= secondary interface packets in general) */
- (batman_packet->flags & DIRECTLINK ||
- (forw_packet->own &&
- forw_packet->if_incoming->if_num != 0)))
- return true;
- }
-
- return false;
-}
-
-#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
-/* create a new aggregated packet and add this packet to it */
-static void new_aggregated_packet(unsigned char *packet_buff, int packet_len,
- unsigned long send_time, bool direct_link,
- struct batman_if *if_incoming,
- int own_packet)
-{
- struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
- struct forw_packet *forw_packet_aggr;
- unsigned long flags;
- unsigned char *skb_buff;
-
- /* own packet should always be scheduled */
- if (!own_packet) {
- if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
- bat_dbg(DBG_BATMAN, bat_priv,
- "batman packet queue full\n");
- return;
- }
- }
-
- forw_packet_aggr = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
- if (!forw_packet_aggr) {
- if (!own_packet)
- atomic_inc(&bat_priv->batman_queue_left);
- return;
- }
-
- if ((atomic_read(&bat_priv->aggregation_enabled)) &&
- (packet_len < MAX_AGGREGATION_BYTES))
- forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES +
- sizeof(struct ethhdr));
- else
- forw_packet_aggr->skb = dev_alloc_skb(packet_len +
- sizeof(struct ethhdr));
-
- if (!forw_packet_aggr->skb) {
- if (!own_packet)
- atomic_inc(&bat_priv->batman_queue_left);
- kfree(forw_packet_aggr);
- return;
- }
- skb_reserve(forw_packet_aggr->skb, sizeof(struct ethhdr));
-
- INIT_HLIST_NODE(&forw_packet_aggr->list);
-
- skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
- forw_packet_aggr->packet_len = packet_len;
- memcpy(skb_buff, packet_buff, packet_len);
-
- forw_packet_aggr->own = own_packet;
- forw_packet_aggr->if_incoming = if_incoming;
- forw_packet_aggr->num_packets = 0;
- forw_packet_aggr->direct_link_flags = 0;
- forw_packet_aggr->send_time = send_time;
-
- /* save packet direct link flag status */
- if (direct_link)
- forw_packet_aggr->direct_link_flags |= 1;
-
- /* add new packet to packet list */
- spin_lock_irqsave(&bat_priv->forw_bat_list_lock, flags);
- hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
- spin_unlock_irqrestore(&bat_priv->forw_bat_list_lock, flags);
-
- /* start timer for this packet */
- INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
- send_outstanding_bat_packet);
- queue_delayed_work(bat_event_workqueue,
- &forw_packet_aggr->delayed_work,
- send_time - jiffies);
-}
-
-/* aggregate a new packet into the existing aggregation */
-static void aggregate(struct forw_packet *forw_packet_aggr,
- unsigned char *packet_buff,
- int packet_len,
- bool direct_link)
-{
- unsigned char *skb_buff;
-
- skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
- memcpy(skb_buff, packet_buff, packet_len);
- forw_packet_aggr->packet_len += packet_len;
- forw_packet_aggr->num_packets++;
-
- /* save packet direct link flag status */
- if (direct_link)
- forw_packet_aggr->direct_link_flags |=
- (1 << forw_packet_aggr->num_packets);
-}
-
-void add_bat_packet_to_list(struct bat_priv *bat_priv,
- unsigned char *packet_buff, int packet_len,
- struct batman_if *if_incoming, char own_packet,
- unsigned long send_time)
-{
- /**
- * _aggr -> pointer to the packet we want to aggregate with
- * _pos -> pointer to the position in the queue
- */
- struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL;
- struct hlist_node *tmp_node;
- struct batman_packet *batman_packet =
- (struct batman_packet *)packet_buff;
- bool direct_link = batman_packet->flags & DIRECTLINK ? 1 : 0;
- unsigned long flags;
-
- /* find position for the packet in the forward queue */
- spin_lock_irqsave(&bat_priv->forw_bat_list_lock, flags);
- /* own packets are not to be aggregated */
- if ((atomic_read(&bat_priv->aggregation_enabled)) && (!own_packet)) {
- hlist_for_each_entry(forw_packet_pos, tmp_node,
- &bat_priv->forw_bat_list, list) {
- if (can_aggregate_with(batman_packet,
- packet_len,
- send_time,
- direct_link,
- if_incoming,
- forw_packet_pos)) {
- forw_packet_aggr = forw_packet_pos;
- break;
- }
- }
- }
-
- /* nothing to aggregate with - either aggregation disabled or no
- * suitable aggregation packet found */
- if (forw_packet_aggr == NULL) {
- /* the following section can run without the lock */
- spin_unlock_irqrestore(&bat_priv->forw_bat_list_lock, flags);
-
- /**
- * if we could not aggregate this packet with one of the others
- * we hold it back for a while, so that it might be aggregated
- * later on
- */
- if ((!own_packet) &&
- (atomic_read(&bat_priv->aggregation_enabled)))
- send_time += msecs_to_jiffies(MAX_AGGREGATION_MS);
-
- new_aggregated_packet(packet_buff, packet_len,
- send_time, direct_link,
- if_incoming, own_packet);
- } else {
- aggregate(forw_packet_aggr,
- packet_buff, packet_len,
- direct_link);
- spin_unlock_irqrestore(&bat_priv->forw_bat_list_lock, flags);
- }
-}
-
-/* unpack the aggregated packets and process them one by one */
-void receive_aggr_bat_packet(struct ethhdr *ethhdr, unsigned char *packet_buff,
- int packet_len, struct batman_if *if_incoming)
-{
- struct batman_packet *batman_packet;
- int buff_pos = 0;
- unsigned char *hna_buff;
-
- batman_packet = (struct batman_packet *)packet_buff;
-
- do {
- /* network to host order for our 32bit seqno, and the
- orig_interval. */
- batman_packet->seqno = ntohl(batman_packet->seqno);
-
- hna_buff = packet_buff + buff_pos + BAT_PACKET_LEN;
- receive_bat_packet(ethhdr, batman_packet,
- hna_buff, hna_len(batman_packet),
- if_incoming);
-
- buff_pos += BAT_PACKET_LEN + hna_len(batman_packet);
- batman_packet = (struct batman_packet *)
- (packet_buff + buff_pos);
- } while (aggregated_packet(buff_pos, packet_len,
- batman_packet->num_hna));
-}
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