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Date: Wed, 26 Nov 2014 11:41:54 +0800
From: Ying Xue <ying.xue@...driver.com>
To: <davem@...emloft.net>
CC: <jon.maloy@...csson.com>, <Paul.Gortmaker@...driver.com>,
<erik.hugne@...csson.com>, <richard.alpe@...csson.com>,
<netdev@...r.kernel.org>, <tipc-discussion@...ts.sourceforge.net>
Subject: [PATCH net-next 10/11] tipc: use generic SKB list APIs to manage link receive queue
Use standard SKB list APIs associated with struct sk_buff_head to
manage link's receive queue to simplify its relevant code cemplexity.
Signed-off-by: Ying Xue <ying.xue@...driver.com>
Reviewed-by: Jon Maloy <jon.maloy@...csson.com>
---
net/tipc/bearer.h | 2 +-
net/tipc/link.c | 85 +++++++++++++++++++++++------------------------------
2 files changed, 37 insertions(+), 50 deletions(-)
diff --git a/net/tipc/bearer.h b/net/tipc/bearer.h
index b1d9052..2c1230a 100644
--- a/net/tipc/bearer.h
+++ b/net/tipc/bearer.h
@@ -165,7 +165,7 @@ extern struct tipc_bearer __rcu *bearer_list[];
* TIPC routines available to supported media types
*/
-void tipc_rcv(struct sk_buff *buf, struct tipc_bearer *tb_ptr);
+void tipc_rcv(struct sk_buff *skb, struct tipc_bearer *tb_ptr);
int tipc_enable_bearer(const char *bearer_name, u32 disc_domain, u32 priority);
int tipc_disable_bearer(const char *name);
diff --git a/net/tipc/link.c b/net/tipc/link.c
index d9c2310..0e04508 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -966,29 +966,17 @@ void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb,
}
}
-/**
- * link_insert_deferred_queue - insert deferred messages back into receive chain
- */
-static struct sk_buff *link_insert_deferred_queue(struct tipc_link *l_ptr,
- struct sk_buff *buf)
+static void link_retrieve_defq(struct tipc_link *link,
+ struct sk_buff_head *list)
{
- struct sk_buff_head head;
- struct sk_buff *skb = NULL;
u32 seq_no;
- if (skb_queue_empty(&l_ptr->deferred_queue))
- return buf;
-
- seq_no = buf_seqno(skb_peek(&l_ptr->deferred_queue));
- if (seq_no == mod(l_ptr->next_in_no)) {
- __skb_queue_head_init(&head);
- skb_queue_splice_tail_init(&l_ptr->deferred_queue, &head);
- skb = head.next;
- skb->prev = NULL;
- head.prev->next = buf;
- head.prev->prev = NULL;
- }
- return skb;
+ if (skb_queue_empty(&link->deferred_queue))
+ return;
+
+ seq_no = buf_seqno(skb_peek(&link->deferred_queue));
+ if (seq_no == mod(link->next_in_no))
+ skb_queue_splice_tail_init(&link->deferred_queue, list);
}
/**
@@ -1048,43 +1036,43 @@ static int link_recv_buf_validate(struct sk_buff *buf)
/**
* tipc_rcv - process TIPC packets/messages arriving from off-node
- * @head: pointer to message buffer chain
+ * @skb: TIPC packet
* @b_ptr: pointer to bearer message arrived on
*
* Invoked with no locks held. Bearer pointer must point to a valid bearer
* structure (i.e. cannot be NULL), but bearer can be inactive.
*/
-void tipc_rcv(struct sk_buff *head, struct tipc_bearer *b_ptr)
+void tipc_rcv(struct sk_buff *skb, struct tipc_bearer *b_ptr)
{
- while (head) {
- struct tipc_node *n_ptr;
- struct tipc_link *l_ptr;
- struct sk_buff *buf = head;
- struct sk_buff *skb1, *tmp;
- struct tipc_msg *msg;
- u32 seq_no;
- u32 ackd;
- u32 released;
+ struct sk_buff_head head;
+ struct tipc_node *n_ptr;
+ struct tipc_link *l_ptr;
+ struct sk_buff *skb1, *tmp;
+ struct tipc_msg *msg;
+ u32 seq_no;
+ u32 ackd;
+ u32 released;
- head = head->next;
- buf->next = NULL;
+ __skb_queue_head_init(&head);
+ __skb_queue_tail(&head, skb);
+ while ((skb = __skb_dequeue(&head))) {
/* Ensure message is well-formed */
- if (unlikely(!link_recv_buf_validate(buf)))
+ if (unlikely(!link_recv_buf_validate(skb)))
goto discard;
/* Ensure message data is a single contiguous unit */
- if (unlikely(skb_linearize(buf)))
+ if (unlikely(skb_linearize(skb)))
goto discard;
/* Handle arrival of a non-unicast link message */
- msg = buf_msg(buf);
+ msg = buf_msg(skb);
if (unlikely(msg_non_seq(msg))) {
if (msg_user(msg) == LINK_CONFIG)
- tipc_disc_rcv(buf, b_ptr);
+ tipc_disc_rcv(skb, b_ptr);
else
- tipc_bclink_rcv(buf);
+ tipc_bclink_rcv(skb);
continue;
}
@@ -1145,8 +1133,8 @@ void tipc_rcv(struct sk_buff *head, struct tipc_bearer *b_ptr)
/* Process the incoming packet */
if (unlikely(!link_working_working(l_ptr))) {
if (msg_user(msg) == LINK_PROTOCOL) {
- tipc_link_proto_rcv(l_ptr, buf);
- head = link_insert_deferred_queue(l_ptr, head);
+ tipc_link_proto_rcv(l_ptr, skb);
+ link_retrieve_defq(l_ptr, &head);
tipc_node_unlock(n_ptr);
continue;
}
@@ -1156,8 +1144,7 @@ void tipc_rcv(struct sk_buff *head, struct tipc_bearer *b_ptr)
if (link_working_working(l_ptr)) {
/* Re-insert buffer in front of queue */
- buf->next = head;
- head = buf;
+ __skb_queue_head(&head, skb);
tipc_node_unlock(n_ptr);
continue;
}
@@ -1166,33 +1153,33 @@ void tipc_rcv(struct sk_buff *head, struct tipc_bearer *b_ptr)
/* Link is now in state WORKING_WORKING */
if (unlikely(seq_no != mod(l_ptr->next_in_no))) {
- link_handle_out_of_seq_msg(l_ptr, buf);
- head = link_insert_deferred_queue(l_ptr, head);
+ link_handle_out_of_seq_msg(l_ptr, skb);
+ link_retrieve_defq(l_ptr, &head);
tipc_node_unlock(n_ptr);
continue;
}
l_ptr->next_in_no++;
if (unlikely(!skb_queue_empty(&l_ptr->deferred_queue)))
- head = link_insert_deferred_queue(l_ptr, head);
+ link_retrieve_defq(l_ptr, &head);
if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
l_ptr->stats.sent_acks++;
tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
}
- if (tipc_link_prepare_input(l_ptr, &buf)) {
+ if (tipc_link_prepare_input(l_ptr, &skb)) {
tipc_node_unlock(n_ptr);
continue;
}
tipc_node_unlock(n_ptr);
- msg = buf_msg(buf);
- if (tipc_link_input(l_ptr, buf) != 0)
+
+ if (tipc_link_input(l_ptr, skb) != 0)
goto discard;
continue;
unlock_discard:
tipc_node_unlock(n_ptr);
discard:
- kfree_skb(buf);
+ kfree_skb(skb);
}
}
--
1.7.9.5
--
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