[CCID-4] Enforces a minimum interval of 10 milliseconds as per CCID-4 draft
Signed-off-by: Leandro Melo de Sales <leandro@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Tommi Saviranta <wnd@xxxxxx>
Index: leandro.new/net/dccp/ccids/ccid4.c
===================================================================
--- leandro.new.orig/net/dccp/ccids/ccid4.c
+++ leandro.new/net/dccp/ccids/ccid4.c
@@ -111,9 +111,11 @@ static inline u64 rfc3390_initial_rate(s
*/
static inline void ccid4_update_send_interval(struct ccid4_hc_tx_sock *hctx)
{
- /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */
- hctx->ccid4hctx_t_ipi = scaled_div32(((u64)hctx->ccid4hctx_s) << 6,
- hctx->ccid4hctx_x);
+ /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second).
+ * TFRC-SP enforces a minimum interval of 10 milliseconds. */
+ hctx->ccid4hctx_t_ipi =
+ max_t(u32, scaled_div32(((u64)hctx->ccid4hctx_s) << 6,
+ hctx->ccid4hctx_x), MIN_SEND_RATE);
/* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
hctx->ccid4hctx_delta = min_t(u32, hctx->ccid4hctx_t_ipi / 2,
Index: leandro.new/net/dccp/ccids/ccid4.h
===================================================================
--- leandro.new.orig/net/dccp/ccids/ccid4.h
+++ leandro.new/net/dccp/ccids/ccid4.h
@@ -68,6 +68,9 @@
/* The nominal packet size to be used into TFRC equation as per CCID-4 draft*/
#define NOM_PACKET_SIZE 1460
+/* Mininum sending rate as per CCID-4 draft */
+#define MIN_SEND_RATE 10000
+
enum ccid4_options {
TFRC_OPT_LOSS_EVENT_RATE = 192,
TFRC_OPT_LOSS_INTERVALS = 193,
-
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