[TFRC]: Loss-intervals access-macros and -functions
Access to the Loss Interval Records is not direct, but (like in object-oriented
programming) via functions.
The macros are for unprotected access, the functions implement safety checks
which ensure that the macros are called in a sane state.
Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
---
net/dccp/ccids/lib/loss_interval.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
--- a/net/dccp/ccids/lib/loss_interval.c
+++ b/net/dccp/ccids/lib/loss_interval.c
@@ -16,6 +16,27 @@
#include "../../dccp.h"
#include "loss_interval.h"
+/*
+ * Access macros: These require that at least one entry is present in lh,
+ * and implement array semantics (0 is first, n-1 is the last of n entries).
+ */
+#define __lih_index(lh, n) LIH_INDEX((lh)->counter - (n) - 1)
+#define __lih_entry(lh, n) (lh)->ring[__lih_index(lh, n)]
+#define __curr_entry(lh) (lh)->ring[LIH_INDEX((lh)->counter - 1)]
+#define __next_entry(lh) (lh)->ring[LIH_INDEX((lh)->counter)]
+
+/* given i with 0 <= i <= k, return I_i as per the rfc3448bis notation */
+static inline u32 tfrc_lh_get_interval(struct tfrc_loss_hist *lh, u8 i)
+{
+ BUG_ON(i >= lh->counter);
+ return __lih_entry(lh, i)->li_length;
+}
+
+static inline struct tfrc_loss_interval *tfrc_lh_peek(struct tfrc_loss_hist *lh)
+{
+ return lh->counter ? __curr_entry(lh) : NULL;
+}
+
struct dccp_li_hist *dccp_li_hist_new(const char *name)
{
struct dccp_li_hist *hist = kmalloc(sizeof(*hist), GFP_ATOMIC);
-
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