diff options
Diffstat (limited to 'net/dccp/ccids/lib/loss_interval.h')
| -rw-r--r-- | net/dccp/ccids/lib/loss_interval.h | 64 |
1 files changed, 55 insertions, 9 deletions
diff --git a/net/dccp/ccids/lib/loss_interval.h b/net/dccp/ccids/lib/loss_interval.h index 27bee92dae13..246018a3b269 100644 --- a/net/dccp/ccids/lib/loss_interval.h +++ b/net/dccp/ccids/lib/loss_interval.h @@ -3,6 +3,7 @@ /* * net/dccp/ccids/lib/loss_interval.h * + * Copyright (c) 2007 The University of Aberdeen, Scotland, UK * Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand. * Copyright (c) 2005-7 Ian McDonald <ian.mcdonald@jandi.co.nz> * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> @@ -12,18 +13,63 @@ * Software Foundation; either version 2 of the License, or (at your option) * any later version. */ - #include <linux/ktime.h> #include <linux/list.h> +#include <linux/slab.h> + +/* + * Number of loss intervals (RFC 4342, 8.6.1). The history size is one more than + * NINTERVAL, since the `open' interval I_0 is always stored as the first entry. + */ +#define NINTERVAL 8 +#define LIH_SIZE (NINTERVAL + 1) + +/** + * tfrc_loss_interval - Loss history record for TFRC-based protocols + * @li_seqno: Highest received seqno before the start of loss + * @li_ccval: The CCVal belonging to @li_seqno + * @li_is_closed: Whether @li_seqno is older than 1 RTT + * @li_length: Loss interval sequence length + */ +struct tfrc_loss_interval { + u64 li_seqno:48, + li_ccval:4, + li_is_closed:1; + u32 li_length; +}; + +/** + * tfrc_loss_hist - Loss record database + * @ring: Circular queue managed in LIFO manner + * @counter: Current count of entries (can be more than %LIH_SIZE) + * @i_mean: Current Average Loss Interval [RFC 3448, 5.4] + */ +struct tfrc_loss_hist { + struct tfrc_loss_interval *ring[LIH_SIZE]; + u8 counter; + u32 i_mean; +}; + +static inline void tfrc_lh_init(struct tfrc_loss_hist *lh) +{ + memset(lh, 0, sizeof(struct tfrc_loss_hist)); +} + +static inline u8 tfrc_lh_is_initialised(struct tfrc_loss_hist *lh) +{ + return lh->counter > 0; +} + +static inline u8 tfrc_lh_length(struct tfrc_loss_hist *lh) +{ + return min(lh->counter, (u8)LIH_SIZE); +} -extern void dccp_li_hist_purge(struct list_head *list); +struct tfrc_rx_hist; -extern u32 dccp_li_hist_calc_i_mean(struct list_head *list); +extern int tfrc_lh_interval_add(struct tfrc_loss_hist *, struct tfrc_rx_hist *, + u32 (*first_li)(struct sock *), struct sock *); +extern u8 tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *); +extern void tfrc_lh_cleanup(struct tfrc_loss_hist *lh); -extern void dccp_li_update_li(struct sock *sk, - struct list_head *li_hist_list, - struct list_head *hist_list, - ktime_t last_feedback, u16 s, - u32 bytes_recv, u32 previous_x_recv, - u64 seq_loss, u8 win_loss); #endif /* _DCCP_LI_HIST_ */ |