cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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loss_interval.h (2019B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2#ifndef _DCCP_LI_HIST_
      3#define _DCCP_LI_HIST_
      4/*
      5 *  Copyright (c) 2007   The University of Aberdeen, Scotland, UK
      6 *  Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand.
      7 *  Copyright (c) 2005-7 Ian McDonald <ian.mcdonald@jandi.co.nz>
      8 *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
      9 */
     10#include <linux/ktime.h>
     11#include <linux/list.h>
     12#include <linux/slab.h>
     13
     14/*
     15 * Number of loss intervals (RFC 4342, 8.6.1). The history size is one more than
     16 * NINTERVAL, since the `open' interval I_0 is always stored as the first entry.
     17 */
     18#define NINTERVAL	8
     19#define LIH_SIZE	(NINTERVAL + 1)
     20
     21/**
     22 *  tfrc_loss_interval  -  Loss history record for TFRC-based protocols
     23 *  @li_seqno:		Highest received seqno before the start of loss
     24 *  @li_ccval:		The CCVal belonging to @li_seqno
     25 *  @li_is_closed:	Whether @li_seqno is older than 1 RTT
     26 *  @li_length:		Loss interval sequence length
     27 */
     28struct tfrc_loss_interval {
     29	u64		 li_seqno:48,
     30			 li_ccval:4,
     31			 li_is_closed:1;
     32	u32		 li_length;
     33};
     34
     35/**
     36 *  tfrc_loss_hist  -  Loss record database
     37 *  @ring:	Circular queue managed in LIFO manner
     38 *  @counter:	Current count of entries (can be more than %LIH_SIZE)
     39 *  @i_mean:	Current Average Loss Interval [RFC 3448, 5.4]
     40 */
     41struct tfrc_loss_hist {
     42	struct tfrc_loss_interval	*ring[LIH_SIZE];
     43	u8				counter;
     44	u32				i_mean;
     45};
     46
     47static inline void tfrc_lh_init(struct tfrc_loss_hist *lh)
     48{
     49	memset(lh, 0, sizeof(struct tfrc_loss_hist));
     50}
     51
     52static inline u8 tfrc_lh_is_initialised(struct tfrc_loss_hist *lh)
     53{
     54	return lh->counter > 0;
     55}
     56
     57static inline u8 tfrc_lh_length(struct tfrc_loss_hist *lh)
     58{
     59	return min(lh->counter, (u8)LIH_SIZE);
     60}
     61
     62struct tfrc_rx_hist;
     63
     64int tfrc_lh_interval_add(struct tfrc_loss_hist *, struct tfrc_rx_hist *,
     65			 u32 (*first_li)(struct sock *), struct sock *);
     66u8 tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *);
     67void tfrc_lh_cleanup(struct tfrc_loss_hist *lh);
     68
     69#endif /* _DCCP_LI_HIST_ */