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tipc: Allow retransmission of cloned buffers

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fc477e160af086f6e30c3d4fdf5f5c000d29beb5
from git://tipc.cslab.ericsson.net/pub/git/people/allan/tipc.git

Origional commit message:

Allow retransmission of cloned buffers

This patch fixes an issue with TIPC's message retransmission logic
that prevented retransmission of clone sk_buffs.  Originally intended
as a means of avoiding wasted work in retransmitting messages that
were still on the driver's outbound queue, it also prevented TIPC
from retransmitting messages through other means -- such as the
secondary bearer of the broadcast link, or another interface in a
set of bonded interfaces.  This fix removes existing checks for
cloned sk_buffs that prevented such retransmission.

Origionally-Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Horman 2010-03-15 07:58:45 +00:00 committed by David S. Miller
parent 1a624832a0
commit ca50910185
1 changed files with 6 additions and 5 deletions
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11
net/tipc/link.c
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@ -1553,7 +1553,7 @@ u32 tipc_link_push_packet(struct link *l_ptr)
/* Continue retransmission now, if there is anything: */
if (r_q_size && buf && !skb_cloned(buf)) {
if (r_q_size && buf) {
msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
@ -1722,15 +1722,16 @@ void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *buf,
dbg("Retransmitting %u in link %x\n", retransmits, l_ptr);
if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
if (!skb_cloned(buf)) {
if (l_ptr->retransm_queue_size == 0) {
msg_dbg(msg, ">NO_RETR->BCONG>");
dbg_print_link(l_ptr, " ");
l_ptr->retransm_queue_head = msg_seqno(msg);
l_ptr->retransm_queue_size = retransmits;
return;
} else {
/* Don't retransmit if driver already has the buffer */
err("Unexpected retransmit on link %s (qsize=%d)\n",
l_ptr->name, l_ptr->retransm_queue_size);
}
return;
} else {
/* Detect repeated retransmit failures on uncongested bearer */
@ -1745,7 +1746,7 @@ void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *buf,
}
}
while (retransmits && (buf != l_ptr->next_out) && buf && !skb_cloned(buf)) {
while (retransmits && (buf != l_ptr->next_out) && buf) {
msg = buf_msg(buf);
msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);