X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Ftipc%2Fbcast.c;h=730c5c47ed8d4b67b465caba2dc9768d514e3f87;hb=refs%2Fremotes%2Fvserver;hp=a7b04f397c12c322adabc8f4b5be30efebff041c;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c index a7b04f397..730c5c47e 100644 --- a/net/tipc/bcast.c +++ b/net/tipc/bcast.c @@ -49,13 +49,19 @@ #include "name_table.h" #include "bcast.h" - #define MAX_PKT_DEFAULT_MCAST 1500 /* bcast link max packet size (fixed) */ #define BCLINK_WIN_DEFAULT 20 /* bcast link window size (default) */ #define BCLINK_LOG_BUF_SIZE 0 +/* + * Loss rate for incoming broadcast frames; used to test retransmission code. + * Set to N to cause every N'th frame to be discarded; 0 => don't discard any. + */ + +#define TIPC_BCAST_LOSS_RATE 0 + /** * struct bcbearer_pair - a pair of bearers used by broadcast link * @primary: pointer to primary bearer @@ -75,7 +81,14 @@ struct bcbearer_pair { * @bearer: (non-standard) broadcast bearer structure * @media: (non-standard) broadcast media structure * @bpairs: array of bearer pairs - * @bpairs_temp: array of bearer pairs used during creation of "bpairs" + * @bpairs_temp: temporary array of bearer pairs used by tipc_bcbearer_sort() + * @remains: temporary node map used by tipc_bcbearer_send() + * @remains_new: temporary node map used tipc_bcbearer_send() + * + * Note: The fields labelled "temporary" are incorporated into the bearer + * to avoid consuming potentially limited stack space through the use of + * large local variables within multicast routines. Concurrent access is + * prevented through use of the spinlock "bc_lock". */ struct bcbearer { @@ -83,6 +96,8 @@ struct bcbearer { struct media media; struct bcbearer_pair bpairs[MAX_BEARERS]; struct bcbearer_pair bpairs_temp[TIPC_MAX_LINK_PRI + 1]; + struct node_map remains; + struct node_map remains_new; }; /** @@ -102,27 +117,27 @@ struct bclink { static struct bcbearer *bcbearer = NULL; static struct bclink *bclink = NULL; static struct link *bcl = NULL; -static spinlock_t bc_lock = SPIN_LOCK_UNLOCKED; +static DEFINE_SPINLOCK(bc_lock); char tipc_bclink_name[] = "multicast-link"; -static inline u32 buf_seqno(struct sk_buff *buf) +static u32 buf_seqno(struct sk_buff *buf) { return msg_seqno(buf_msg(buf)); } -static inline u32 bcbuf_acks(struct sk_buff *buf) +static u32 bcbuf_acks(struct sk_buff *buf) { return (u32)(unsigned long)TIPC_SKB_CB(buf)->handle; } -static inline void bcbuf_set_acks(struct sk_buff *buf, u32 acks) +static void bcbuf_set_acks(struct sk_buff *buf, u32 acks) { TIPC_SKB_CB(buf)->handle = (void *)(unsigned long)acks; } -static inline void bcbuf_decr_acks(struct sk_buff *buf) +static void bcbuf_decr_acks(struct sk_buff *buf) { bcbuf_set_acks(buf, bcbuf_acks(buf) - 1); } @@ -134,7 +149,7 @@ static inline void bcbuf_decr_acks(struct sk_buff *buf) * Called with 'node' locked, bc_lock unlocked */ -static inline void bclink_set_gap(struct node *n_ptr) +static void bclink_set_gap(struct node *n_ptr) { struct sk_buff *buf = n_ptr->bclink.deferred_head; @@ -154,7 +169,7 @@ static inline void bclink_set_gap(struct node *n_ptr) * distribute NACKs, but tries to use the same spacing (divide by 16). */ -static inline int bclink_ack_allowed(u32 n) +static int bclink_ack_allowed(u32 n) { return((n % TIPC_MIN_LINK_WIN) == tipc_own_tag); } @@ -165,21 +180,18 @@ static inline int bclink_ack_allowed(u32 n) * @after: sequence number of last packet to *not* retransmit * @to: sequence number of last packet to retransmit * - * Called with 'node' locked, bc_lock unlocked + * Called with bc_lock locked */ static void bclink_retransmit_pkt(u32 after, u32 to) { struct sk_buff *buf; - spin_lock_bh(&bc_lock); buf = bcl->first_out; while (buf && less_eq(buf_seqno(buf), after)) { buf = buf->next; } - if (buf != NULL) - tipc_link_retransmit(bcl, buf, mod(to - after)); - spin_unlock_bh(&bc_lock); + tipc_link_retransmit(bcl, buf, mod(to - after)); } /** @@ -271,7 +283,7 @@ static void bclink_send_nack(struct node *n_ptr) msg_set_bcgap_to(msg, n_ptr->bclink.gap_to); msg_set_bcast_tag(msg, tipc_own_tag); - if (tipc_bearer_send(&bcbearer->bearer, buf, 0)) { + if (tipc_bearer_send(&bcbearer->bearer, buf, NULL)) { bcl->stats.sent_nacks++; buf_discard(buf); } else { @@ -314,7 +326,7 @@ void tipc_bclink_check_gap(struct node *n_ptr, u32 last_sent) * Only tipc_net_lock set. */ -void tipc_bclink_peek_nack(u32 dest, u32 sender_tag, u32 gap_after, u32 gap_to) +static void tipc_bclink_peek_nack(u32 dest, u32 sender_tag, u32 gap_after, u32 gap_to) { struct node *n_ptr = tipc_node_find(dest); u32 my_after, my_to; @@ -346,8 +358,10 @@ void tipc_bclink_peek_nack(u32 dest, u32 sender_tag, u32 gap_after, u32 gap_to) for (; buf; buf = buf->next) { u32 seqno = buf_seqno(buf); - if (mod(seqno - prev) != 1) + if (mod(seqno - prev) != 1) { buf = NULL; + break; + } if (seqno == gap_after) break; prev = seqno; @@ -399,7 +413,10 @@ int tipc_bclink_send_msg(struct sk_buff *buf) */ void tipc_bclink_recv_pkt(struct sk_buff *buf) -{ +{ +#if (TIPC_BCAST_LOSS_RATE) + static int rx_count = 0; +#endif struct tipc_msg *msg = buf_msg(buf); struct node* node = tipc_node_find(msg_prevnode(msg)); u32 next_in; @@ -420,19 +437,31 @@ void tipc_bclink_recv_pkt(struct sk_buff *buf) tipc_node_lock(node); tipc_bclink_acknowledge(node, msg_bcast_ack(msg)); tipc_node_unlock(node); + spin_lock_bh(&bc_lock); bcl->stats.recv_nacks++; + bcl->owner->next = node; /* remember requestor */ bclink_retransmit_pkt(msg_bcgap_after(msg), msg_bcgap_to(msg)); + bcl->owner->next = NULL; + spin_unlock_bh(&bc_lock); } else { tipc_bclink_peek_nack(msg_destnode(msg), - msg_bcast_tag(msg), - msg_bcgap_after(msg), - msg_bcgap_to(msg)); + msg_bcast_tag(msg), + msg_bcgap_after(msg), + msg_bcgap_to(msg)); } buf_discard(buf); return; } +#if (TIPC_BCAST_LOSS_RATE) + if (++rx_count == TIPC_BCAST_LOSS_RATE) { + rx_count = 0; + buf_discard(buf); + return; + } +#endif + tipc_node_lock(node); receive: deferred = node->bclink.deferred_head; @@ -525,14 +554,12 @@ u32 tipc_bclink_acks_missing(struct node *n_ptr) * Returns 0 if packet sent successfully, non-zero if not */ -int tipc_bcbearer_send(struct sk_buff *buf, - struct tipc_bearer *unused1, - struct tipc_media_addr *unused2) +static int tipc_bcbearer_send(struct sk_buff *buf, + struct tipc_bearer *unused1, + struct tipc_media_addr *unused2) { static int send_count = 0; - struct node_map remains; - struct node_map remains_new; int bp_index; int swap_time; @@ -555,7 +582,7 @@ int tipc_bcbearer_send(struct sk_buff *buf, /* Send buffer over bearers until all targets reached */ - remains = tipc_cltr_bcast_nodes; + bcbearer->remains = tipc_cltr_bcast_nodes; for (bp_index = 0; bp_index < MAX_BEARERS; bp_index++) { struct bearer *p = bcbearer->bpairs[bp_index].primary; @@ -564,8 +591,8 @@ int tipc_bcbearer_send(struct sk_buff *buf, if (!p) break; /* no more bearers to try */ - tipc_nmap_diff(&remains, &p->nodes, &remains_new); - if (remains_new.count == remains.count) + tipc_nmap_diff(&bcbearer->remains, &p->nodes, &bcbearer->remains_new); + if (bcbearer->remains_new.count == bcbearer->remains.count) continue; /* bearer pair doesn't add anything */ if (!p->publ.blocked && @@ -583,10 +610,10 @@ swap: bcbearer->bpairs[bp_index].primary = s; bcbearer->bpairs[bp_index].secondary = p; update: - if (remains_new.count == 0) + if (bcbearer->remains_new.count == 0) return TIPC_OK; - remains = remains_new; + bcbearer->remains = bcbearer->remains_new; } /* Unable to reach all targets */ @@ -747,11 +774,11 @@ int tipc_bclink_set_queue_limits(u32 limit) int tipc_bclink_init(void) { - bcbearer = kmalloc(sizeof(*bcbearer), GFP_ATOMIC); - bclink = kmalloc(sizeof(*bclink), GFP_ATOMIC); + bcbearer = kzalloc(sizeof(*bcbearer), GFP_ATOMIC); + bclink = kzalloc(sizeof(*bclink), GFP_ATOMIC); if (!bcbearer || !bclink) { nomem: - warn("Memory squeeze; Failed to create multicast link\n"); + warn("Multicast link creation failed, no memory\n"); kfree(bcbearer); bcbearer = NULL; kfree(bclink); @@ -759,17 +786,15 @@ int tipc_bclink_init(void) return -ENOMEM; } - memset(bcbearer, 0, sizeof(struct bcbearer)); INIT_LIST_HEAD(&bcbearer->bearer.cong_links); bcbearer->bearer.media = &bcbearer->media; bcbearer->media.send_msg = tipc_bcbearer_send; sprintf(bcbearer->media.name, "tipc-multicast"); bcl = &bclink->link; - memset(bclink, 0, sizeof(struct bclink)); INIT_LIST_HEAD(&bcl->waiting_ports); bcl->next_out_no = 1; - bclink->node.lock = SPIN_LOCK_UNLOCKED; + spin_lock_init(&bclink->node.lock); bcl->owner = &bclink->node; bcl->max_pkt = MAX_PKT_DEFAULT_MCAST; tipc_link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT);