lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[TIPC]: Multicast link failure now resets all links to "nacking" node.

Browse Source 
This fix prevents node from crashing.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Per Liden <per.liden@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Allan Stephens
2006-06-25 23:40:01 -07:00
committed by David S. Miller
parent 260082471e
commit d356eeba8e
2 changed files with 128 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
net/tipc/bcast.c
View File

@@ -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
@@ -165,21 +171,18 @@ static 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));
}
/**
@@ -399,7 +402,10 @@ 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;
@@ -420,9 +426,13 @@ 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),
@@ -433,6 +443,14 @@ void tipc_bclink_recv_pkt(struct sk_buff *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;