[B.A.T.M.A.N.] [RFC 01/10] batman-adv: make struct batadv_neigh_node algorithm agnostic

From: Antonio Quartulli antonio@open-mesh.com

some of the fields in struct batadv_neigh_node are strictly related to the B.A.T.M.A.N. IV algorithm. In order to make the struct usable by any routing algorithm it has to be split and made more generic

Signed-off-by: Antonio Quartulli antonio@open-mesh.com --- bat_iv_ogm.c | 65 ++++++++++++++++++++++++++++------------------------- gateway_client.c | 16 ++++++------- network-coding.c | 8 ++++--- originator.c | 28 ++++++++++++----------- originator.h | 3 ++- routing.c | 9 ++++---- translation-table.c | 4 ++-- types.h | 42 ++++++++++++++++++++-------------- 8 files changed, 96 insertions(+), 79 deletions(-)

diff --git a/bat_iv_ogm.c b/bat_iv_ogm.c index 8d87f87..d885aa8 100644 --- a/bat_iv_ogm.c +++ b/bat_iv_ogm.c @@ -76,20 +76,18 @@ batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, struct batadv_orig_node *orig_node, struct batadv_orig_node *orig_neigh) { + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); struct batadv_neigh_node *neigh_node;

- neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr); + neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node); if (!neigh_node) goto out;

- INIT_LIST_HEAD(&neigh_node->bonding_list); + spin_lock_init(&neigh_node->bat_iv.lq_update_lock);

- neigh_node->orig_node = orig_neigh; - neigh_node->if_incoming = hard_iface; - - spin_lock_bh(&orig_node->neigh_list_lock); - hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); - spin_unlock_bh(&orig_node->neigh_list_lock); + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Creating new neighbor %pM for orig_node %pM on interface %s\n", + neigh_addr, orig_node->orig, hard_iface->net_dev->name);

out: return neigh_node; @@ -737,12 +735,12 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, if (is_duplicate) continue;

- spin_lock_bh(&tmp_neigh_node->lq_update_lock); - batadv_ring_buffer_set(tmp_neigh_node->tq_recv, - &tmp_neigh_node->tq_index, 0); - tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv); - tmp_neigh_node->tq_avg = tq_avg; - spin_unlock_bh(&tmp_neigh_node->lq_update_lock); + spin_lock_bh(&tmp_neigh_node->bat_iv.lq_update_lock); + batadv_ring_buffer_set(tmp_neigh_node->bat_iv.tq_recv, + &tmp_neigh_node->bat_iv.tq_index, 0); + tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->bat_iv.tq_recv); + tmp_neigh_node->bat_iv.tq_avg = tq_avg; + spin_unlock_bh(&tmp_neigh_node->bat_iv.lq_update_lock); }

if (!neigh_node) { @@ -767,12 +765,13 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,

neigh_node->last_seen = jiffies;

- spin_lock_bh(&neigh_node->lq_update_lock); - batadv_ring_buffer_set(neigh_node->tq_recv, - &neigh_node->tq_index, + spin_lock_bh(&neigh_node->bat_iv.lq_update_lock); + batadv_ring_buffer_set(neigh_node->bat_iv.tq_recv, + &neigh_node->bat_iv.tq_index, batadv_ogm_packet->tq); - neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv); - spin_unlock_bh(&neigh_node->lq_update_lock); + tq_avg = batadv_ring_buffer_avg(neigh_node->bat_iv.tq_recv); + neigh_node->bat_iv.tq_avg = tq_avg; + spin_unlock_bh(&neigh_node->bat_iv.lq_update_lock);

if (!is_duplicate) { orig_node->last_ttl = batadv_ogm_packet->header.ttl; @@ -789,13 +788,13 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, goto out;

/* if this neighbor does not offer a better TQ we won't consider it */ - if (router && (router->tq_avg > neigh_node->tq_avg)) + if (router && (router->bat_iv.tq_avg > neigh_node->bat_iv.tq_avg)) goto out;

/* if the TQ is the same and the link not more symmetric we * won't consider it either */ - if (router && (neigh_node->tq_avg == router->tq_avg)) { + if (router && (neigh_node->bat_iv.tq_avg == router->bat_iv.tq_avg)) { orig_node_tmp = router->orig_node; spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); if_num = router->if_incoming->if_num; @@ -874,7 +873,7 @@ static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, /* find packet count of corresponding one hop neighbor */ spin_lock_bh(&orig_node->ogm_cnt_lock); orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; - neigh_rq_count = neigh_node->real_packet_count; + neigh_rq_count = neigh_node->bat_iv.real_packet_count; spin_unlock_bh(&orig_node->ogm_cnt_lock);

/* pay attention to not get a value bigger than 100 % */ @@ -955,6 +954,7 @@ batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, uint32_t seqno = ntohl(batadv_ogm_packet->seqno); uint8_t *neigh_addr; uint8_t packet_count; + unsigned long (*bitmap)[];

orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); if (!orig_node) @@ -972,7 +972,8 @@ batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, rcu_read_lock(); hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) { - is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits, + bitmap = &tmp_neigh_node->bat_iv.real_bits; + is_duplicate |= batadv_test_bit(*bitmap, orig_node->last_real_seqno, seqno);

@@ -984,13 +985,13 @@ batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, set_mark = 0;

/* if the window moved, set the update flag. */ - need_update |= batadv_bit_get_packet(bat_priv, - tmp_neigh_node->real_bits, + bitmap = &tmp_neigh_node->bat_iv.real_bits; + need_update |= batadv_bit_get_packet(bat_priv, *bitmap, seq_diff, set_mark);

- packet_count = bitmap_weight(tmp_neigh_node->real_bits, + packet_count = bitmap_weight(tmp_neigh_node->bat_iv.real_bits, BATADV_TQ_LOCAL_WINDOW_SIZE); - tmp_neigh_node->real_packet_count = packet_count; + tmp_neigh_node->bat_iv.real_packet_count = packet_count; } rcu_read_unlock();

@@ -1016,7 +1017,7 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, { struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); struct batadv_hard_iface *hard_iface; - struct batadv_orig_node *orig_neigh_node, *orig_node; + struct batadv_orig_node *orig_neigh_node, *orig_node, *orig_node_tmp; struct batadv_neigh_node *router = NULL, *router_router = NULL; struct batadv_neigh_node *orig_neigh_router = NULL; int has_directlink_flag; @@ -1166,10 +1167,12 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, }

router = batadv_orig_node_get_router(orig_node); - if (router) - router_router = batadv_orig_node_get_router(router->orig_node); + if (router) { + orig_node_tmp = router->orig_node; + router_router = batadv_orig_node_get_router(orig_node_tmp); + }

- if ((router && router->tq_avg != 0) && + if ((router && router->bat_iv.tq_avg != 0) && (batadv_compare_eth(router->addr, ethhdr->h_source))) is_from_best_next_hop = true;

diff --git a/gateway_client.c b/gateway_client.c index 278e8f6..69488b2 100644 --- a/gateway_client.c +++ b/gateway_client.c @@ -137,7 +137,7 @@ batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) if (!atomic_inc_not_zero(&gw_node->refcount)) goto next;

- tq_avg = router->tq_avg; + tq_avg = router->bat_iv.tq_avg;

switch (atomic_read(&bat_priv->gw_sel_class)) { case 1: /* fast connection */ @@ -234,7 +234,7 @@ void batadv_gw_election(struct batadv_priv *bat_priv) next_gw->bandwidth_down / 10, next_gw->bandwidth_down % 10, next_gw->bandwidth_up / 10, - next_gw->bandwidth_up % 10, router->tq_avg); + next_gw->bandwidth_up % 10, router->bat_iv.tq_avg); batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, gw_addr); } else { @@ -244,7 +244,7 @@ void batadv_gw_election(struct batadv_priv *bat_priv) next_gw->bandwidth_down / 10, next_gw->bandwidth_down % 10, next_gw->bandwidth_up / 10, - next_gw->bandwidth_up % 10, router->tq_avg); + next_gw->bandwidth_up % 10, router->bat_iv.tq_avg); batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, gw_addr); } @@ -283,8 +283,8 @@ void batadv_gw_check_election(struct batadv_priv *bat_priv, if (!router_orig) goto out;

- gw_tq_avg = router_gw->tq_avg; - orig_tq_avg = router_orig->tq_avg; + gw_tq_avg = router_gw->bat_iv.tq_avg; + orig_tq_avg = router_orig->bat_iv.tq_avg;

/* the TQ value has to be better */ if (orig_tq_avg < gw_tq_avg) @@ -506,7 +506,7 @@ static int batadv_write_buffer_text(struct batadv_priv *bat_priv, ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", (curr_gw == gw_node ? "=>" : " "), gw_node->orig_node->orig, - router->tq_avg, router->addr, + router->bat_iv.tq_avg, router->addr, router->if_incoming->net_dev->name, gw_node->bandwidth_down / 10, gw_node->bandwidth_down % 10, @@ -759,7 +759,7 @@ bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, if (!neigh_curr) goto out;

- curr_tq_avg = neigh_curr->tq_avg; + curr_tq_avg = neigh_curr->bat_iv.tq_avg; break; case BATADV_GW_MODE_OFF: default: @@ -770,7 +770,7 @@ bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, if (!neigh_old) goto out;

- if (curr_tq_avg - neigh_old->tq_avg > BATADV_GW_THRESHOLD) + if (curr_tq_avg - neigh_old->bat_iv.tq_avg > BATADV_GW_THRESHOLD) out_of_range = true;

out: diff --git a/network-coding.c b/network-coding.c index ef88a1f..173a96e 100644 --- a/network-coding.c +++ b/network-coding.c @@ -994,7 +994,7 @@ static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, struct batadv_nc_packet *nc_packet, struct batadv_neigh_node *neigh_node) { - uint8_t tq_weighted_neigh, tq_weighted_coding; + uint8_t tq_weighted_neigh, tq_weighted_coding, tq_tmp; struct sk_buff *skb_dest, *skb_src; struct batadv_unicast_packet *packet1; struct batadv_unicast_packet *packet2; @@ -1019,8 +1019,10 @@ static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, if (!router_coding) goto out;

- tq_weighted_neigh = batadv_nc_random_weight_tq(router_neigh->tq_avg); - tq_weighted_coding = batadv_nc_random_weight_tq(router_coding->tq_avg); + tq_tmp = batadv_nc_random_weight_tq(router_neigh->bat_iv.tq_avg); + tq_weighted_neigh = tq_tmp; + tq_tmp = batadv_nc_random_weight_tq(router_coding->bat_iv.tq_avg); + tq_weighted_coding = tq_tmp;

/* Select one destination for the MAC-header dst-field based on * weighted TQ-values. diff --git a/originator.c b/originator.c index c878a00..3d312de 100644 --- a/originator.c +++ b/originator.c @@ -174,27 +174,28 @@ batadv_orig_node_get_router(struct batadv_orig_node *orig_node)

struct batadv_neigh_node * batadv_neigh_node_new(struct batadv_hard_iface *hard_iface, - const uint8_t *neigh_addr) + const uint8_t *neigh_addr, + struct batadv_orig_node *orig_node) { - struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); struct batadv_neigh_node *neigh_node;

neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC); if (!neigh_node) goto out;

- INIT_HLIST_NODE(&neigh_node->list); - memcpy(neigh_node->addr, neigh_addr, ETH_ALEN); - spin_lock_init(&neigh_node->lq_update_lock); + neigh_node->if_incoming = hard_iface; + neigh_node->orig_node = orig_node; + + spin_lock_bh(&orig_node->neigh_list_lock); + hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); + spin_unlock_bh(&orig_node->neigh_list_lock); + + INIT_LIST_HEAD(&neigh_node->bonding_list);

/* extra reference for return */ atomic_set(&neigh_node->refcount, 2);

- batadv_dbg(BATADV_DBG_BATMAN, bat_priv, - "Creating new neighbor %pM on interface %s\n", neigh_addr, - hard_iface->net_dev->name); - out: return neigh_node; } @@ -432,7 +433,8 @@ batadv_purge_orig_neighbors(struct batadv_priv *bat_priv, batadv_neigh_node_free_ref(neigh_node); } else { if ((!*best_neigh_node) || - (neigh_node->tq_avg > (*best_neigh_node)->tq_avg)) + (neigh_node->bat_iv.tq_avg > + (*best_neigh_node)->bat_iv.tq_avg)) *best_neigh_node = neigh_node; } } @@ -553,7 +555,7 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset) if (!neigh_node) continue;

- if (neigh_node->tq_avg == 0) + if (neigh_node->bat_iv.tq_avg == 0) goto next;

last_seen_jiffies = jiffies - orig_node->last_seen; @@ -563,7 +565,7 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)

seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:", orig_node->orig, last_seen_secs, - last_seen_msecs, neigh_node->tq_avg, + last_seen_msecs, neigh_node->bat_iv.tq_avg, neigh_node->addr, neigh_node->if_incoming->net_dev->name);

@@ -571,7 +573,7 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset) &orig_node->neigh_list, list) { seq_printf(seq, " %pM (%3i)", neigh_node_tmp->addr, - neigh_node_tmp->tq_avg); + neigh_node_tmp->bat_iv.tq_avg); }

seq_puts(seq, "\n"); diff --git a/originator.h b/originator.h index cc6d686..06e5a68 100644 --- a/originator.h +++ b/originator.h @@ -31,7 +31,8 @@ struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv, const uint8_t *addr); struct batadv_neigh_node * batadv_neigh_node_new(struct batadv_hard_iface *hard_iface, - const uint8_t *neigh_addr); + const uint8_t *neigh_addr, + struct batadv_orig_node *orig_node); void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node); struct batadv_neigh_node * batadv_orig_node_get_router(struct batadv_orig_node *orig_node); diff --git a/routing.c b/routing.c index 2b35205..99f6844 100644 --- a/routing.c +++ b/routing.c @@ -133,7 +133,8 @@ void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node, goto candidate_del;

/* ... and is good enough to be considered */ - if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD) + if (neigh_node->bat_iv.tq_avg < + router->bat_iv.tq_avg - BATADV_BONDING_TQ_THRESHOLD) goto candidate_del;

/* check if we have another candidate with the same mac address or @@ -470,8 +471,7 @@ batadv_find_bond_router(struct batadv_orig_node *primary_orig, * does not exist as rcu version */ list_del_rcu(&primary_orig->bond_list); - list_add_rcu(&primary_orig->bond_list, - &router->bonding_list); + list_add_rcu(&primary_orig->bond_list, &router->bonding_list); spin_unlock_bh(&primary_orig->neigh_list_lock);

out: @@ -502,7 +502,8 @@ batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, if (tmp_neigh_node->if_incoming == recv_if) continue;

- if (router && tmp_neigh_node->tq_avg <= router->tq_avg) + if (router && + tmp_neigh_node->bat_iv.tq_avg <= router->bat_iv.tq_avg) continue;

if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) diff --git a/translation-table.c b/translation-table.c index 9401ca8..a256cdb 100644 --- a/translation-table.c +++ b/translation-table.c @@ -1229,9 +1229,9 @@ batadv_transtable_best_orig(struct batadv_tt_global_entry *tt_global_entry) if (!router) continue;

- if (router->tq_avg > best_tq) { + if (router->bat_iv.tq_avg > best_tq) { best_entry = orig_entry; - best_tq = router->tq_avg; + best_tq = router->bat_iv.tq_avg; }

batadv_neigh_node_free_ref(router); diff --git a/types.h b/types.h index a4d6d9f..c7d5fa1 100644 --- a/types.h +++ b/types.h @@ -257,40 +257,48 @@ struct batadv_gw_node { };

/** - * struct batadv_neigh_node - structure for single hop neighbors - * @list: list node for batadv_orig_node::neigh_list - * @addr: mac address of neigh node + * struct batadv_neigh_bat_iv - structure for single hop neighbors * @tq_recv: ring buffer of received TQ values from this neigh node * @tq_index: ring buffer index * @tq_avg: averaged tq of all tq values in the ring buffer (tq_recv) - * @last_ttl: last received ttl from this neigh node - * @bonding_list: list node for batadv_orig_node::bond_list - * @last_seen: when last packet via this neighbor was received * @real_bits: bitfield containing the number of OGMs received from this neigh * node (relative to orig_node->last_real_seqno) * @real_packet_count: counted result of real_bits - * @orig_node: pointer to corresponding orig_node - * @if_incoming: pointer to incoming hard interface * @lq_update_lock: lock protecting tq_recv & tq_index * @refcount: number of contexts the object is used - * @rcu: struct used for freeing in an RCU-safe manner */ -struct batadv_neigh_node { - struct hlist_node list; - uint8_t addr[ETH_ALEN]; +struct batadv_neigh_bat_iv { uint8_t tq_recv[BATADV_TQ_GLOBAL_WINDOW_SIZE]; uint8_t tq_index; uint8_t tq_avg; - uint8_t last_ttl; - struct list_head bonding_list; - unsigned long last_seen; DECLARE_BITMAP(real_bits, BATADV_TQ_LOCAL_WINDOW_SIZE); uint8_t real_packet_count; - struct batadv_orig_node *orig_node; - struct batadv_hard_iface *if_incoming; spinlock_t lq_update_lock; /* protects tq_recv & tq_index */ +}; + +/** + * struct batadv_neigh_node - structure for single hops neighbors + * @list: list node for batadv_orig_node::neigh_list + * @orig_node: pointer to corresponding orig_node + * @addr: the MAC address of the neighboring interface + * @if_incoming: pointer to incoming hard interface + * @last_seen: when last packet via this neighbor was received + * @last_ttl: last received ttl from this neigh node + * @bonding_list: list node for batadv_orig_node::bond_list + * @rcu: struct used for freeing in an RCU-safe manner + * @priv: pointer to the routing algorithm private data + */ +struct batadv_neigh_node { + struct hlist_node list; + struct batadv_orig_node *orig_node; + uint8_t addr[ETH_ALEN]; + struct batadv_hard_iface *if_incoming; + unsigned long last_seen; + uint8_t last_ttl; + struct list_head bonding_list; atomic_t refcount; struct rcu_head rcu; + struct batadv_neigh_bat_iv bat_iv; };

/**