batman-adv: bcast: queue per interface, if needed
Currently we schedule a broadcast packet like: 3x: [ [(re-)queue] --> for(hard-if): maybe-transmit ] The intention of queueing a broadcast packet multiple times is to increase robustness for wireless interfaces. However on interfaces which we only broadcast on once the queueing induces an unnecessary penalty. This patch restructures the queueing to be performed on a per interface basis: for(hard-if): - transmit - if wireless: [queue] --> transmit --> [requeue] --> transmit Next to the performance benefits on non-wireless interfaces this should also make it easier to apply alternative strategies for transmissions on wireless interfaces in the future (for instance sending via unicast transmissions on wireless interfaces, without queueing in batman-adv, if appropriate). Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Linus Lüssing
Simon Wunderlich
parent
d295345abb
commit
3f69339068
@ -88,7 +88,6 @@
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/* number of packets to send for broadcasts on different interface types */
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#define BATADV_NUM_BCASTS_DEFAULT 1
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#define BATADV_NUM_BCASTS_WIRELESS 3
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#define BATADV_NUM_BCASTS_MAX 3
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/* length of the single packet used by the TP meter */
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#define BATADV_TP_PACKET_LEN ETH_DATA_LEN
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@ -1182,9 +1182,9 @@ int batadv_recv_bcast_packet(struct sk_buff *skb,
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struct batadv_bcast_packet *bcast_packet;
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struct ethhdr *ethhdr;
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int hdr_size = sizeof(*bcast_packet);
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int ret = NET_RX_DROP;
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s32 seq_diff;
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u32 seqno;
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int ret;
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/* drop packet if it has not necessary minimum size */
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if (unlikely(!pskb_may_pull(skb, hdr_size)))
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@ -1210,7 +1210,7 @@ int batadv_recv_bcast_packet(struct sk_buff *skb,
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if (batadv_is_my_mac(bat_priv, bcast_packet->orig))
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goto free_skb;
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if (bcast_packet->ttl < 2)
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if (bcast_packet->ttl-- < 2)
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goto free_skb;
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orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig);
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@ -1249,7 +1249,9 @@ int batadv_recv_bcast_packet(struct sk_buff *skb,
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batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet));
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/* rebroadcast packet */
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batadv_add_bcast_packet_to_list(bat_priv, skb, 1, false);
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ret = batadv_forw_bcast_packet(bat_priv, skb, 0, false);
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if (ret == NETDEV_TX_BUSY)
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goto free_skb;
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/* don't hand the broadcast up if it is from an originator
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* from the same backbone.
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@ -1275,6 +1277,7 @@ spin_unlock:
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spin_unlock_bh(&orig_node->bcast_seqno_lock);
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free_skb:
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kfree_skb(skb);
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ret = NET_RX_DROP;
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out:
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if (orig_node)
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batadv_orig_node_put(orig_node);
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@ -737,57 +737,48 @@ void batadv_forw_packet_ogmv1_queue(struct batadv_priv *bat_priv,
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}
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/**
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* batadv_add_bcast_packet_to_list() - queue broadcast packet for multiple sends
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* batadv_forw_bcast_packet_to_list() - queue broadcast packet for transmissions
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: broadcast packet to add
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* @delay: number of jiffies to wait before sending
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* @own_packet: true if it is a self-generated broadcast packet
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* @if_in: the interface where the packet was received on
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* @if_out: the outgoing interface to queue on
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*
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* add a broadcast packet to the queue and setup timers. broadcast packets
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* Adds a broadcast packet to the queue and sets up timers. Broadcast packets
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* are sent multiple times to increase probability for being received.
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*
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* The skb is not consumed, so the caller should make sure that the
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* skb is freed.
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*
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* Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors.
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*/
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int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
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const struct sk_buff *skb,
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static int batadv_forw_bcast_packet_to_list(struct batadv_priv *bat_priv,
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struct sk_buff *skb,
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unsigned long delay,
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bool own_packet)
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bool own_packet,
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struct batadv_hard_iface *if_in,
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struct batadv_hard_iface *if_out)
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{
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struct batadv_hard_iface *primary_if;
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struct batadv_forw_packet *forw_packet;
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struct batadv_bcast_packet *bcast_packet;
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unsigned long send_time = jiffies;
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struct sk_buff *newskb;
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if)
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goto err;
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newskb = skb_copy(skb, GFP_ATOMIC);
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if (!newskb) {
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batadv_hardif_put(primary_if);
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if (!newskb)
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goto err;
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}
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forw_packet = batadv_forw_packet_alloc(primary_if, NULL,
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forw_packet = batadv_forw_packet_alloc(if_in, if_out,
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&bat_priv->bcast_queue_left,
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bat_priv, newskb);
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batadv_hardif_put(primary_if);
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if (!forw_packet)
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goto err_packet_free;
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/* as we have a copy now, it is safe to decrease the TTL */
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bcast_packet = (struct batadv_bcast_packet *)newskb->data;
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bcast_packet->ttl--;
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forw_packet->own = own_packet;
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INIT_DELAYED_WORK(&forw_packet->delayed_work,
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batadv_send_outstanding_bcast_packet);
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batadv_forw_packet_bcast_queue(bat_priv, forw_packet, jiffies + delay);
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send_time += delay ? delay : msecs_to_jiffies(5);
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batadv_forw_packet_bcast_queue(bat_priv, forw_packet, send_time);
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return NETDEV_TX_OK;
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err_packet_free:
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@ -797,114 +788,93 @@ err:
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}
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/**
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* batadv_forw_packet_bcasts_left() - check if a retransmission is necessary
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* @forw_packet: the forwarding packet to check
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* @hard_iface: the interface to check on
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* batadv_forw_bcast_packet_if() - forward and queue a broadcast packet
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: broadcast packet to add
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* @delay: number of jiffies to wait before sending
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* @own_packet: true if it is a self-generated broadcast packet
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* @if_in: the interface where the packet was received on
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* @if_out: the outgoing interface to forward to
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*
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* Checks whether a given packet has any (re)transmissions left on the provided
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* interface.
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* Transmits a broadcast packet on the specified interface either immediately
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* or if a delay is given after that. Furthermore, queues additional
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* retransmissions if this interface is a wireless one.
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*
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* hard_iface may be NULL: In that case the number of transmissions this skb had
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* so far is compared with the maximum amount of retransmissions independent of
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* any interface instead.
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*
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* Return: True if (re)transmissions are left, false otherwise.
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* Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors.
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*/
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static bool
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batadv_forw_packet_bcasts_left(struct batadv_forw_packet *forw_packet,
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struct batadv_hard_iface *hard_iface)
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static int batadv_forw_bcast_packet_if(struct batadv_priv *bat_priv,
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struct sk_buff *skb,
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unsigned long delay,
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bool own_packet,
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struct batadv_hard_iface *if_in,
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struct batadv_hard_iface *if_out)
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{
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unsigned int max;
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unsigned int num_bcasts = if_out->num_bcasts;
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struct sk_buff *newskb;
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int ret = NETDEV_TX_OK;
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if (hard_iface)
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max = hard_iface->num_bcasts;
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else
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max = BATADV_NUM_BCASTS_MAX;
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if (!delay) {
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newskb = skb_copy(skb, GFP_ATOMIC);
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if (!newskb)
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return NETDEV_TX_BUSY;
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return BATADV_SKB_CB(forw_packet->skb)->num_bcasts < max;
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batadv_send_broadcast_skb(newskb, if_out);
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num_bcasts--;
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}
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/* delayed broadcast or rebroadcasts? */
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if (num_bcasts >= 1) {
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BATADV_SKB_CB(skb)->num_bcasts = num_bcasts;
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ret = batadv_forw_bcast_packet_to_list(bat_priv, skb, delay,
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own_packet, if_in,
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if_out);
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}
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return ret;
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}
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/**
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* batadv_forw_packet_bcasts_inc() - increment retransmission counter of a
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* packet
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* @forw_packet: the packet to increase the counter for
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*/
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static void
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batadv_forw_packet_bcasts_inc(struct batadv_forw_packet *forw_packet)
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{
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BATADV_SKB_CB(forw_packet->skb)->num_bcasts++;
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}
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/**
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* batadv_forw_packet_is_rebroadcast() - check packet for previous transmissions
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* @forw_packet: the packet to check
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* batadv_send_no_broadcast() - check whether (re)broadcast is necessary
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: broadcast packet to check
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* @own_packet: true if it is a self-generated broadcast packet
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* @if_out: the outgoing interface checked and considered for (re)broadcast
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*
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* Return: True if this packet was transmitted before, false otherwise.
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* Return: False if a packet needs to be (re)broadcasted on the given interface,
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* true otherwise.
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*/
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bool batadv_forw_packet_is_rebroadcast(struct batadv_forw_packet *forw_packet)
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static bool batadv_send_no_broadcast(struct batadv_priv *bat_priv,
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struct sk_buff *skb, bool own_packet,
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struct batadv_hard_iface *if_out)
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{
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return BATADV_SKB_CB(forw_packet->skb)->num_bcasts > 0;
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}
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static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
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{
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struct batadv_hard_iface *hard_iface;
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struct batadv_hardif_neigh_node *neigh_node;
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struct delayed_work *delayed_work;
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struct batadv_forw_packet *forw_packet;
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struct batadv_hardif_neigh_node *neigh_node = NULL;
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struct batadv_bcast_packet *bcast_packet;
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struct sk_buff *skb1;
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struct net_device *soft_iface;
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struct batadv_priv *bat_priv;
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unsigned long send_time = jiffies + msecs_to_jiffies(5);
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bool dropped = false;
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u8 *neigh_addr;
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u8 *orig_neigh;
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int ret = 0;
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u8 *neigh_addr;
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char *type;
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int ret;
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delayed_work = to_delayed_work(work);
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forw_packet = container_of(delayed_work, struct batadv_forw_packet,
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delayed_work);
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soft_iface = forw_packet->if_incoming->soft_iface;
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bat_priv = netdev_priv(soft_iface);
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if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) {
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dropped = true;
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goto out;
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}
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if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) {
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dropped = true;
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goto out;
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}
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bcast_packet = (struct batadv_bcast_packet *)forw_packet->skb->data;
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/* rebroadcast packet */
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rcu_read_lock();
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list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
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if (hard_iface->soft_iface != soft_iface)
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continue;
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if (!batadv_forw_packet_bcasts_left(forw_packet, hard_iface))
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continue;
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if (forw_packet->own) {
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neigh_node = NULL;
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} else {
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neigh_addr = eth_hdr(forw_packet->skb)->h_source;
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neigh_node = batadv_hardif_neigh_get(hard_iface,
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if (!own_packet) {
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neigh_addr = eth_hdr(skb)->h_source;
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neigh_node = batadv_hardif_neigh_get(if_out,
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neigh_addr);
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}
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bcast_packet = (struct batadv_bcast_packet *)skb->data;
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orig_neigh = neigh_node ? neigh_node->orig : NULL;
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ret = batadv_hardif_no_broadcast(hard_iface, bcast_packet->orig,
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ret = batadv_hardif_no_broadcast(if_out, bcast_packet->orig,
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orig_neigh);
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if (ret) {
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char *type;
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if (neigh_node)
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batadv_hardif_neigh_put(neigh_node);
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/* ok, may broadcast */
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if (!ret)
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return false;
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/* no broadcast */
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switch (ret) {
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case BATADV_HARDIF_BCAST_NORECIPIENT:
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type = "no neighbor";
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@ -919,35 +889,197 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
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type = "unknown";
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}
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "BCAST packet from orig %pM on %s suppressed: %s\n",
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"BCAST packet from orig %pM on %s suppressed: %s\n",
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bcast_packet->orig,
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hard_iface->net_dev->name, type);
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if_out->net_dev->name, type);
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if (neigh_node)
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batadv_hardif_neigh_put(neigh_node);
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return true;
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}
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/**
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* __batadv_forw_bcast_packet() - forward and queue a broadcast packet
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: broadcast packet to add
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* @delay: number of jiffies to wait before sending
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* @own_packet: true if it is a self-generated broadcast packet
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*
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* Transmits a broadcast packet either immediately or if a delay is given
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* after that. Furthermore, queues additional retransmissions on wireless
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* interfaces.
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*
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* This call clones the given skb, hence the caller needs to take into
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* account that the data segment of the given skb might not be
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* modifiable anymore.
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*
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* Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors.
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*/
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static int __batadv_forw_bcast_packet(struct batadv_priv *bat_priv,
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struct sk_buff *skb,
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unsigned long delay,
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bool own_packet)
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{
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struct batadv_hard_iface *hard_iface;
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struct batadv_hard_iface *primary_if;
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int ret = NETDEV_TX_OK;
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if)
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return NETDEV_TX_BUSY;
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rcu_read_lock();
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list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
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if (hard_iface->soft_iface != bat_priv->soft_iface)
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continue;
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}
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if (neigh_node)
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batadv_hardif_neigh_put(neigh_node);
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if (!kref_get_unless_zero(&hard_iface->refcount))
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continue;
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/* send a copy of the saved skb */
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skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
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if (skb1)
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batadv_send_broadcast_skb(skb1, hard_iface);
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if (batadv_send_no_broadcast(bat_priv, skb, own_packet,
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hard_iface)) {
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batadv_hardif_put(hard_iface);
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continue;
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}
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ret = batadv_forw_bcast_packet_if(bat_priv, skb, delay,
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own_packet, primary_if,
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hard_iface);
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batadv_hardif_put(hard_iface);
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if (ret == NETDEV_TX_BUSY)
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break;
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}
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rcu_read_unlock();
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batadv_forw_packet_bcasts_inc(forw_packet);
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batadv_hardif_put(primary_if);
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return ret;
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}
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/* if we still have some more bcasts to send */
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if (batadv_forw_packet_bcasts_left(forw_packet, NULL)) {
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/**
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* batadv_forw_bcast_packet() - forward and queue a broadcast packet
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: broadcast packet to add
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* @delay: number of jiffies to wait before sending
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* @own_packet: true if it is a self-generated broadcast packet
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*
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* Transmits a broadcast packet either immediately or if a delay is given
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* after that. Furthermore, queues additional retransmissions on wireless
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* interfaces.
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*
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* Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors.
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*/
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int batadv_forw_bcast_packet(struct batadv_priv *bat_priv,
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struct sk_buff *skb,
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unsigned long delay,
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bool own_packet)
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{
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return __batadv_forw_bcast_packet(bat_priv, skb, delay, own_packet);
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}
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/**
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* batadv_send_bcast_packet() - send and queue a broadcast packet
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: broadcast packet to add
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* @delay: number of jiffies to wait before sending
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* @own_packet: true if it is a self-generated broadcast packet
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*
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* Transmits a broadcast packet either immediately or if a delay is given
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* after that. Furthermore, queues additional retransmissions on wireless
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* interfaces.
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*
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* Consumes the provided skb.
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*/
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void batadv_send_bcast_packet(struct batadv_priv *bat_priv,
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struct sk_buff *skb,
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unsigned long delay,
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bool own_packet)
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{
|
||||
__batadv_forw_bcast_packet(bat_priv, skb, delay, own_packet);
|
||||
consume_skb(skb);
|
||||
}
|
||||
|
||||
/**
|
||||
* batadv_forw_packet_bcasts_left() - check if a retransmission is necessary
|
||||
* @forw_packet: the forwarding packet to check
|
||||
*
|
||||
* 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)
|
||||
{
|
||||
return BATADV_SKB_CB(forw_packet->skb)->num_bcasts;
|
||||
}
|
||||
|
||||
/**
|
||||
* batadv_forw_packet_bcasts_dec() - decrement retransmission counter of a
|
||||
* packet
|
||||
* @forw_packet: the packet to decrease the counter for
|
||||
*/
|
||||
static void
|
||||
batadv_forw_packet_bcasts_dec(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)
|
||||
{
|
||||
unsigned char num_bcasts = BATADV_SKB_CB(forw_packet->skb)->num_bcasts;
|
||||
|
||||
return num_bcasts != forw_packet->if_outgoing->num_bcasts;
|
||||
}
|
||||
|
||||
/**
|
||||
* batadv_send_outstanding_bcast_packet() - transmit a queued broadcast packet
|
||||
* @work: work queue item
|
||||
*
|
||||
* Transmits a queued broadcast packet and if necessary reschedules it.
|
||||
*/
|
||||
static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
|
||||
{
|
||||
unsigned long send_time = jiffies + msecs_to_jiffies(5);
|
||||
struct batadv_forw_packet *forw_packet;
|
||||
struct delayed_work *delayed_work;
|
||||
struct batadv_priv *bat_priv;
|
||||
struct sk_buff *skb1;
|
||||
bool dropped = false;
|
||||
|
||||
delayed_work = to_delayed_work(work);
|
||||
forw_packet = container_of(delayed_work, struct batadv_forw_packet,
|
||||
delayed_work);
|
||||
bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
|
||||
|
||||
if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) {
|
||||
dropped = true;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) {
|
||||
dropped = true;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* send a copy of the saved skb */
|
||||
skb1 = skb_copy(forw_packet->skb, GFP_ATOMIC);
|
||||
if (!skb1)
|
||||
goto out;
|
||||
|
||||
batadv_send_broadcast_skb(skb1, forw_packet->if_outgoing);
|
||||
batadv_forw_packet_bcasts_dec(forw_packet);
|
||||
|
||||
if (batadv_forw_packet_bcasts_left(forw_packet)) {
|
||||
batadv_forw_packet_bcast_queue(bat_priv, forw_packet,
|
||||
send_time);
|
||||
return;
|
||||
|
||||
@ -39,8 +39,12 @@ int batadv_send_broadcast_skb(struct sk_buff *skb,
|
||||
struct batadv_hard_iface *hard_iface);
|
||||
int batadv_send_unicast_skb(struct sk_buff *skb,
|
||||
struct batadv_neigh_node *neigh_node);
|
||||
int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
|
||||
const struct sk_buff *skb,
|
||||
int batadv_forw_bcast_packet(struct batadv_priv *bat_priv,
|
||||
struct sk_buff *skb,
|
||||
unsigned long delay,
|
||||
bool own_packet);
|
||||
void batadv_send_bcast_packet(struct batadv_priv *bat_priv,
|
||||
struct sk_buff *skb,
|
||||
unsigned long delay,
|
||||
bool own_packet);
|
||||
void
|
||||
|
||||
@ -191,7 +191,7 @@ static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
|
||||
struct vlan_ethhdr *vhdr;
|
||||
unsigned int header_len = 0;
|
||||
int data_len = skb->len, ret;
|
||||
unsigned long brd_delay = 1;
|
||||
unsigned long brd_delay = 0;
|
||||
bool do_bcast = false, client_added;
|
||||
unsigned short vid;
|
||||
u32 seqno;
|
||||
@ -330,7 +330,7 @@ send:
|
||||
|
||||
bcast_packet = (struct batadv_bcast_packet *)skb->data;
|
||||
bcast_packet->version = BATADV_COMPAT_VERSION;
|
||||
bcast_packet->ttl = BATADV_TTL;
|
||||
bcast_packet->ttl = BATADV_TTL - 1;
|
||||
|
||||
/* batman packet type: broadcast */
|
||||
bcast_packet->packet_type = BATADV_BCAST;
|
||||
@ -346,13 +346,7 @@ send:
|
||||
seqno = atomic_inc_return(&bat_priv->bcast_seqno);
|
||||
bcast_packet->seqno = htonl(seqno);
|
||||
|
||||
batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true);
|
||||
|
||||
/* a copy is stored in the bcast list, therefore removing
|
||||
* the original skb.
|
||||
*/
|
||||
consume_skb(skb);
|
||||
|
||||
batadv_send_bcast_packet(bat_priv, skb, brd_delay, true);
|
||||
/* unicast packet */
|
||||
} else {
|
||||
/* DHCP packets going to a server will use the GW feature */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user