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Date: Sat, 8 Dec 2007 10:06:25 +0000
From: Gerrit Renker <gerrit@....abdn.ac.uk>
To: acme@...hat.com
Cc: dccp@...r.kernel.org, netdev@...r.kernel.org,
Gerrit Renker <gerrit@....abdn.ac.uk>
Subject: [PATCH 5/8] [TFRC]: Loss interval code needs the macros/inlines that were moved
This moves the inlines (which were previously declared as macros) back into packet_history.h since
the loss detection code needs to be able to read entries from the RX history in order to create the
relevant loss entries: it needs at least tfrc_rx_hist_loss_prev() and tfrc_rx_hist_last_rcv(), which
in turn require the definition of the other inlines (macros).
Additionally, inn one case the use of inlines instead of a macro broke the algorithm: rx_hist_swap()
(introduced in next patch) needs to be able to swap the history entries; when using an inline returning
a pointer instead, one gets compilation errors such as:
distcc[24516] ERROR: compile /root/.ccache/packet_his.tmp.aspire.home.net.24512.i on _tiptop failed
/usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c: In function '__one_after_loss':
/usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c:266: error: lvalue required as unary '&' operand
/usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c:267: error: lvalue required as unary '&' operand
/usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c: In function '__two_after_loss':
/usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c:298: error: lvalue required as unary '&' operand
/usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c:299: error: lvalue required as unary '&' operand
/usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c:336: error: lvalue required as unary '&' operand
/usr/src/davem-2.6/net/dccp/ccids/lib/packet_history.c:337: error: lvalue required as unary '&' operand
make[4]: *** [net/dccp/ccids/lib/packet_history.o] Error 1
make[3]: *** [net/dccp/ccids/lib] Error 2
make[2]: *** [net/dccp/ccids] Error 2
make[1]: *** [net/dccp/] Error 2
make: *** [sub-make] Error 2
Signed-off-by: Gerrit Renker <gerrit@....abdn.ac.uk>
---
net/dccp/ccids/lib/packet_history.c | 37 +----------------------------------
net/dccp/ccids/lib/packet_history.h | 32 ++++++++++++++++++++++++++++++
2 files changed, 33 insertions(+), 36 deletions(-)
diff --git a/net/dccp/ccids/lib/packet_history.c b/net/dccp/ccids/lib/packet_history.c
index 6256bec..428636e 100644
--- a/net/dccp/ccids/lib/packet_history.c
+++ b/net/dccp/ccids/lib/packet_history.c
@@ -151,41 +151,6 @@ void __exit tfrc_rx_packet_history_exit(void)
}
}
-/**
- * tfrc_rx_hist_index - index to reach n-th entry after loss_start
- */
-static inline u8 tfrc_rx_hist_index(const struct tfrc_rx_hist *h, const u8 n)
-{
- return (h->loss_start + n) & TFRC_NDUPACK;
-}
-
-/**
- * tfrc_rx_hist_last_rcv - entry with highest-received-seqno so far
- */
-static inline struct tfrc_rx_hist_entry *
- tfrc_rx_hist_last_rcv(const struct tfrc_rx_hist *h)
-{
- return h->ring[tfrc_rx_hist_index(h, h->loss_count)];
-}
-
-/**
- * tfrc_rx_hist_entry - return the n-th history entry after loss_start
- */
-static inline struct tfrc_rx_hist_entry *
- tfrc_rx_hist_entry(const struct tfrc_rx_hist *h, const u8 n)
-{
- return h->ring[tfrc_rx_hist_index(h, n)];
-}
-
-/**
- * tfrc_rx_hist_loss_prev - entry with highest-received-seqno before loss was detected
- */
-static inline struct tfrc_rx_hist_entry *
- tfrc_rx_hist_loss_prev(const struct tfrc_rx_hist *h)
-{
- return h->ring[h->loss_start];
-}
-
/* has the packet contained in skb been seen before? */
int tfrc_rx_hist_duplicate(struct tfrc_rx_hist *h, struct sk_buff *skb)
{
@@ -196,7 +161,7 @@ int tfrc_rx_hist_duplicate(struct tfrc_rx_hist *h, struct sk_buff *skb)
return 1;
for (i = 1; i <= h->loss_count; i++)
- if (tfrc_rx_hist_entry(h, i)->tfrchrx_seqno == seq)
+ if (TFRC_RX_HIST_ENTRY(h, i)->tfrchrx_seqno == seq)
return 1;
return 0;
diff --git a/net/dccp/ccids/lib/packet_history.h b/net/dccp/ccids/lib/packet_history.h
index 3dfd182..6ea25cd 100644
--- a/net/dccp/ccids/lib/packet_history.h
+++ b/net/dccp/ccids/lib/packet_history.h
@@ -84,6 +84,38 @@ struct tfrc_rx_hist {
#define rtt_sample_prev loss_start
};
+/**
+ * tfrc_rx_hist_index - index to reach n-th entry after loss_start
+ */
+static inline u8 tfrc_rx_hist_index(const struct tfrc_rx_hist *h, const u8 n)
+{
+ return (h->loss_start + n) & TFRC_NDUPACK;
+}
+
+/**
+ * tfrc_rx_hist_last_rcv - entry with highest-received-seqno so far
+ */
+static inline struct tfrc_rx_hist_entry *
+ tfrc_rx_hist_last_rcv(const struct tfrc_rx_hist *h)
+{
+ return h->ring[tfrc_rx_hist_index(h, h->loss_count)];
+}
+
+/**
+ * tfrc_rx_hist_entry - return the n-th history entry after loss_start
+ * This has to be a macro since rx_hist_swap needs to be able to swap entries.
+ */
+#define TFRC_RX_HIST_ENTRY(h, n) ((h)->ring[tfrc_rx_hist_index(h, n)])
+
+/**
+ * tfrc_rx_hist_loss_prev - entry with highest-received-seqno before loss was detected
+ */
+static inline struct tfrc_rx_hist_entry *
+ tfrc_rx_hist_loss_prev(const struct tfrc_rx_hist *h)
+{
+ return h->ring[h->loss_start];
+}
+
extern void tfrc_rx_hist_add_packet(struct tfrc_rx_hist *h,
const struct sk_buff *skb, const u32 ndp);
--
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