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tipc: changes to general packet reception algorithm

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We change the order of checking for destination users when processing
incoming packets. By placing the checks for users that may potentially
replace the processed buffer, i.e., CHANGEOVER_PROTOCOL and
MSG_FRAGMENTER, in a separate step before we check for the true end
users, we get rid of a label and a 'goto', at the same time making the
code more comprehensible and easy to follow.

This commit does not change any functionality, it is just a cosmetic
code reshuffle.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Paul Maloy 2014-02-13 17:29:15 -05:00 committed by David S. Miller
parent 02842f718d
commit a5377831eb
1 changed files with 40 additions and 36 deletions
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76
net/tipc/link.c
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@ -1484,7 +1484,7 @@ void tipc_rcv(struct sk_buff *head, struct tipc_bearer *b_ptr)
if ((n_ptr->block_setup & WAIT_PEER_DOWN) &&
msg_user(msg) == LINK_PROTOCOL &&
(msg_type(msg) == RESET_MSG ||
msg_type(msg) == ACTIVATE_MSG) &&
msg_type(msg) == ACTIVATE_MSG) &&
!msg_redundant_link(msg))
n_ptr->block_setup &= ~WAIT_PEER_DOWN;
@ -1503,7 +1503,6 @@ void tipc_rcv(struct sk_buff *head, struct tipc_bearer *b_ptr)
while ((crs != l_ptr->next_out) &&
less_eq(buf_seqno(crs), ackd)) {
struct sk_buff *next = crs->next;
kfree_skb(crs);
crs = next;
released++;
@ -1516,14 +1515,17 @@ void tipc_rcv(struct sk_buff *head, struct tipc_bearer *b_ptr)
/* Try sending any messages link endpoint has pending */
if (unlikely(l_ptr->next_out))
tipc_link_push_queue(l_ptr);
if (unlikely(!list_empty(&l_ptr->waiting_ports)))
tipc_link_wakeup_ports(l_ptr, 0);
if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
l_ptr->stats.sent_acks++;
tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
tipc_link_send_proto_msg(l_ptr, STATE_MSG,
0, 0, 0, 0, 0);
}
/* Now (finally!) process the incoming message */
/* Process the incoming packet */
if (unlikely(!link_working_working(l_ptr))) {
if (msg_user(msg) == LINK_PROTOCOL) {
link_recv_proto_msg(l_ptr, buf);
@ -1555,14 +1557,40 @@ void tipc_rcv(struct sk_buff *head, struct tipc_bearer *b_ptr)
l_ptr->next_in_no++;
if (unlikely(l_ptr->oldest_deferred_in))
head = link_insert_deferred_queue(l_ptr, head);
deliver:
if (likely(msg_isdata(msg))) {
/* Deliver packet/message to correct user: */
if (unlikely(msg_user(msg) == CHANGEOVER_PROTOCOL)) {
if (!tipc_link_tunnel_rcv(n_ptr, &buf)) {
tipc_node_unlock(n_ptr);
continue;
}
msg = buf_msg(buf);
} else if (msg_user(msg) == MSG_FRAGMENTER) {
int rc;
l_ptr->stats.recv_fragments++;
rc = tipc_link_frag_rcv(&l_ptr->reasm_head,
&l_ptr->reasm_tail,
&buf);
if (rc == LINK_REASM_COMPLETE) {
l_ptr->stats.recv_fragmented++;
msg = buf_msg(buf);
} else {
if (rc == LINK_REASM_ERROR)
tipc_link_reset(l_ptr);
tipc_node_unlock(n_ptr);
continue;
}
}
switch (msg_user(msg)) {
case TIPC_LOW_IMPORTANCE:
case TIPC_MEDIUM_IMPORTANCE:
case TIPC_HIGH_IMPORTANCE:
case TIPC_CRITICAL_IMPORTANCE:
tipc_node_unlock(n_ptr);
tipc_port_recv_msg(buf);
continue;
}
switch (msg_user(msg)) {
int ret;
case MSG_BUNDLER:
l_ptr->stats.recv_bundles++;
l_ptr->stats.recv_bundled += msg_msgcnt(msg);
@ -1574,44 +1602,20 @@ deliver:
tipc_node_unlock(n_ptr);
tipc_named_recv(buf);
continue;
case BCAST_PROTOCOL:
tipc_link_recv_sync(n_ptr, buf);
tipc_node_unlock(n_ptr);
continue;
case CONN_MANAGER:
tipc_node_unlock(n_ptr);
tipc_port_recv_proto_msg(buf);
continue;
case MSG_FRAGMENTER:
l_ptr->stats.recv_fragments++;
ret = tipc_link_frag_rcv(&l_ptr->reasm_head,
&l_ptr->reasm_tail,
&buf);
if (ret == LINK_REASM_COMPLETE) {
l_ptr->stats.recv_fragmented++;
msg = buf_msg(buf);
goto deliver;
}
if (ret == LINK_REASM_ERROR)
tipc_link_reset(l_ptr);
tipc_node_unlock(n_ptr);
continue;
case CHANGEOVER_PROTOCOL:
if (!tipc_link_tunnel_rcv(n_ptr, &buf))
break;
msg = buf_msg(buf);
seq_no = msg_seqno(msg);
goto deliver;
case BCAST_PROTOCOL:
tipc_link_recv_sync(n_ptr, buf);
break;
default:
kfree_skb(buf);
buf = NULL;
break;
}
tipc_node_unlock(n_ptr);
tipc_net_route_msg(buf);
continue;
unlock_discard:
tipc_node_unlock(n_ptr);
discard:
kfree_skb(buf);