[CCID 3]: New RX History Step 3 - Track highest seqno
The receiver needs to track the highest sequence number (and corresponding
CCVal / timestamp) received so far.
This is implemented with this patch, which updates the `non_loss' entry of
the CCID 3 RX history with the details of the currently received packet.
Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
---
net/dccp/ccids/ccid3.c | 3 +++
net/dccp/ccids/lib/packet_history.h | 19 +++++++++++++++++++
2 files changed, 22 insertions(+)
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -1107,6 +1107,9 @@ static void ccid3_hc_rx_packet_recv(stru
if (ccid3_hc_rx_update_p(hcrx))
ccid3_hc_rx_send_feedback(sk, skb);
+
+ /* Update highest received sequence number so far */
+ tfrc_rx_hist_update(&hcrx->ccid3hcrx_hist, skb, opt_recv->dccpor_ndp);
}
static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk)
--- a/net/dccp/ccids/lib/packet_history.h
+++ b/net/dccp/ccids/lib/packet_history.h
@@ -202,6 +202,25 @@ static inline void tfrc_rx_hist_swap(str
*b = tmp;
}
+static inline void dccp_rx_hist_entry_from_skb(struct dccp_rx_hist_entry *new,
+ struct sk_buff *skb, u32 ndp)
+{
+ const struct dccp_hdr *dh = dccp_hdr(skb);
+
+ new->dccphrx_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
+ new->dccphrx_ccval = dh->dccph_ccval;
+ new->dccphrx_type = dh->dccph_type;
+ new->dccphrx_ndp = ndp;
+ skb_get_timestamp(skb, &new->dccphrx_tstamp);
+}
+
+/* commit packet details of skb to history (record highest received seqno) */
+static inline void tfrc_rx_hist_update(struct tfrc_rx_hist *h,
+ struct sk_buff *skb, u32 ndp)
+{
+ dccp_rx_hist_entry_from_skb(last_rcv(h), skb, ndp);
+}
+
extern int tfrc_rx_hist_init(struct tfrc_rx_hist *);
extern void tfrc_rx_hist_cleanup(struct tfrc_rx_hist *);
-
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