diff options
Diffstat (limited to 'net/dccp/ccids/lib/loss_interval.c')
| -rw-r--r-- | net/dccp/ccids/lib/loss_interval.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/net/dccp/ccids/lib/loss_interval.c b/net/dccp/ccids/lib/loss_interval.c index 5b3ce0688c5..fe5c2a31c77 100644 --- a/net/dccp/ccids/lib/loss_interval.c +++ b/net/dccp/ccids/lib/loss_interval.c @@ -86,21 +86,26 @@ static void tfrc_lh_calc_i_mean(struct tfrc_loss_hist *lh) /** * tfrc_lh_update_i_mean - Update the `open' loss interval I_0 - * For recomputing p: returns `true' if p > p_prev <=> 1/p < 1/p_prev + * This updates I_mean as the sequence numbers increase. As a consequence, the + * open loss interval I_0 increases, hence p = W_tot/max(I_tot0, I_tot1) + * decreases, and thus there is no need to send renewed feedback. */ -u8 tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *skb) +void tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *skb) { struct tfrc_loss_interval *cur = tfrc_lh_peek(lh); - u32 old_i_mean = lh->i_mean; s64 len; if (cur == NULL) /* not initialised */ - return 0; + return; + + /* FIXME: should probably also count non-data packets (RFC 4342, 6.1) */ + if (!dccp_data_packet(skb)) + return; len = dccp_delta_seqno(cur->li_seqno, DCCP_SKB_CB(skb)->dccpd_seq) + 1; if (len - (s64)cur->li_length <= 0) /* duplicate or reordered */ - return 0; + return; if (SUB16(dccp_hdr(skb)->dccph_ccval, cur->li_ccval) > 4) /* @@ -114,14 +119,11 @@ u8 tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *skb) cur->li_is_closed = 1; if (tfrc_lh_length(lh) == 1) /* due to RFC 3448, 6.3.1 */ - return 0; + return; cur->li_length = len; tfrc_lh_calc_i_mean(lh); - - return (lh->i_mean < old_i_mean); } -EXPORT_SYMBOL_GPL(tfrc_lh_update_i_mean); /* Determine if `new_loss' does begin a new loss interval [RFC 4342, 10.2] */ static inline u8 tfrc_lh_is_new_loss(struct tfrc_loss_interval *cur, |