Implement function that allows to keep track of packets sent in last 2 rtt
Changes:
- Creates tfrc_tx_hist_two_rtt_old, that return the first list node at least 2 rtt old
Signed-off-by: Ivo Calado <ivocalado@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Erivaldo Xavier <desadoc@xxxxxxxxx>
Signed-off-by: Leandro Sales <leandroal@xxxxxxxxx>
Index: dccp_tree_work03/net/dccp/ccids/lib/packet_history_sp.c
===================================================================
--- dccp_tree_work03.orig/net/dccp/ccids/lib/packet_history_sp.c 2009-10-08 22:59:20.526408512 -0300
+++ dccp_tree_work03/net/dccp/ccids/lib/packet_history_sp.c 2009-10-08 22:59:32.582408479 -0300
@@ -65,7 +65,7 @@
}
}
-int tfrc_sp_tx_hist_add(struct tfrc_tx_hist_entry **headp, u64 seqno)
+int tfrc_sp_tx_hist_add(struct tfrc_tx_hist_entry **headp, u64 seqno, u8 ccval)
{
struct tfrc_tx_hist_entry *entry =
kmem_cache_alloc(tfrc_tx_hist_slab, gfp_any());
@@ -73,6 +73,7 @@
if (entry == NULL)
return -ENOBUFS;
entry->seqno = seqno;
+ entry->ccval = ccval;
entry->stamp = ktime_get_real();
entry->next = *headp;
*headp = entry;
Index: dccp_tree_work03/net/dccp/ccids/lib/packet_history_sp.h
===================================================================
--- dccp_tree_work03.orig/net/dccp/ccids/lib/packet_history_sp.h 2009-10-08 22:59:20.526408512 -0300
+++ dccp_tree_work03/net/dccp/ccids/lib/packet_history_sp.h 2009-10-08 22:59:32.582408479 -0300
@@ -57,6 +57,7 @@
struct tfrc_tx_hist_entry {
struct tfrc_tx_hist_entry *next;
u64 seqno;
+ u8 ccval:4;
ktime_t stamp;
};
@@ -69,13 +70,27 @@
}
#endif
-extern int tfrc_sp_tx_hist_add(struct tfrc_tx_hist_entry **headp, u64 seqno);
+extern int tfrc_sp_tx_hist_add(struct tfrc_tx_hist_entry **headp,
+ u64 seqno, u8 ccval);
extern void tfrc_sp_tx_hist_purge(struct tfrc_tx_hist_entry **headp);
#ifndef _DCCP_PKT_HIST_
/* Subtraction a-b modulo-16, respects circular wrap-around */
#define SUB16(a, b) (((a) + 16 - (b)) & 0xF)
+/*
+ * tfrc_tx_hist_two_rtt_old - returns entry at least two rtt old
+ * head: list of tx history entries
+ * cur_ccval: current ccval
+ */
+static inline struct tfrc_tx_hist_entry *
+ tfrc_tx_hist_two_rtt_old(struct tfrc_tx_hist_entry *head, u8 cur_ccval)
+{
+ while ((head != NULL) && (SUB16(cur_ccval, head->ccval) <= 8))
+ head = head->next;
+ return head;
+}
+
/* Number of packets to wait after a missing packet (RFC 4342, 6.1) */
#define TFRC_NDUPACK 3
--
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