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tipc: split link outqueue

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struct tipc_link contains one single queue for outgoing packets,
where both transmitted and waiting packets are queued.

This infrastructure is hard to maintain, because we need
to keep a number of fields to keep track of which packets are
sent or unsent, and the number of packets in each category.

A lot of code becomes simpler if we split this queue into a transmission
queue, where sent/unacknowledged packets are kept, and a backlog queue,
where we keep the not yet sent packets.

In this commit we do this separation.

Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Paul Maloy
2015-03-13 16:08:10 -04:00
committed by David S. Miller
parent 2cdf3918e4
commit 05dcc5aa4d
7 changed files with 149 additions and 166 deletions
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32
net/tipc/msg.c
View File

@@ -330,33 +330,36 @@ error:
/**
* tipc_msg_bundle(): Append contents of a buffer to tail of an existing one
* @list: the buffer chain of the existing buffer ("bundle")
* @bskb: the buffer to append to ("bundle")
* @skb: buffer to be appended
* @mtu: max allowable size for the bundle buffer
* Consumes buffer if successful
* Returns true if bundling could be performed, otherwise false
*/
bool tipc_msg_bundle(struct sk_buff_head *list, struct sk_buff *skb, u32 mtu)
bool tipc_msg_bundle(struct sk_buff *bskb, struct sk_buff *skb, u32 mtu)
{
struct sk_buff *bskb = skb_peek_tail(list);
struct tipc_msg *bmsg = buf_msg(bskb);
struct tipc_msg *bmsg;
struct tipc_msg *msg = buf_msg(skb);
unsigned int bsz = msg_size(bmsg);
unsigned int bsz;
unsigned int msz = msg_size(msg);
u32 start = align(bsz);
u32 start, pad;
u32 max = mtu - INT_H_SIZE;
u32 pad = start - bsz;
if (likely(msg_user(msg) == MSG_FRAGMENTER))
return false;
if (!bskb)
return false;
bmsg = buf_msg(bskb);
bsz = msg_size(bmsg);
start = align(bsz);
pad = start - bsz;
if (unlikely(msg_user(msg) == CHANGEOVER_PROTOCOL))
return false;
if (unlikely(msg_user(msg) == BCAST_PROTOCOL))
return false;
if (likely(msg_user(bmsg) != MSG_BUNDLER))
return false;
if (likely(!TIPC_SKB_CB(bskb)->bundling))
return false;
if (unlikely(skb_tailroom(bskb) < (pad + msz)))
return false;
if (unlikely(max < (start + msz)))
@@ -419,12 +422,11 @@ none:
* Replaces buffer if successful
* Returns true if success, otherwise false
*/
bool tipc_msg_make_bundle(struct sk_buff_head *list,
struct sk_buff *skb, u32 mtu, u32 dnode)
bool tipc_msg_make_bundle(struct sk_buff **skb, u32 mtu, u32 dnode)
{
struct sk_buff *bskb;
struct tipc_msg *bmsg;
struct tipc_msg *msg = buf_msg(skb);
struct tipc_msg *msg = buf_msg(*skb);
u32 msz = msg_size(msg);
u32 max = mtu - INT_H_SIZE;
@@ -448,9 +450,9 @@ bool tipc_msg_make_bundle(struct sk_buff_head *list,
msg_set_seqno(bmsg, msg_seqno(msg));
msg_set_ack(bmsg, msg_ack(msg));
msg_set_bcast_ack(bmsg, msg_bcast_ack(msg));
TIPC_SKB_CB(bskb)->bundling = true;
__skb_queue_tail(list, bskb);
return tipc_msg_bundle(list, skb, mtu);
tipc_msg_bundle(bskb, *skb, mtu);
*skb = bskb;
return true;
}
/**