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32 results

decompressor_multi_percpu.c

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  • pkt_sched.h 6.56 KiB
    #ifndef __NET_PKT_SCHED_H
    #define __NET_PKT_SCHED_H
    
    #include <net/sch_generic.h>
    
    struct qdisc_walker
    {
    	int	stop;
    	int	skip;
    	int	count;
    	int	(*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
    };
    
    extern rwlock_t qdisc_tree_lock;
    
    #define	QDISC_ALIGN		32
    #define	QDISC_ALIGN_CONST	(QDISC_ALIGN - 1)
    
    static inline void *qdisc_priv(struct Qdisc *q)
    {
    	return (char *)q + ((sizeof(struct Qdisc) + QDISC_ALIGN_CONST)
    			      & ~QDISC_ALIGN_CONST);
    }
    
    /* 
       Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
       
       Normal IP packet size ~ 512byte, hence:
    
       0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
       10Mbit ethernet.
    
       10msec resolution -> <50Kbit/sec.
       
       The result: [34]86 is not good choice for QoS router :-(
    
       The things are not so bad, because we may use artifical
       clock evaluated by integration of network data flow
       in the most critical places.
    
       Note: we do not use fastgettimeofday.
       The reason is that, when it is not the same thing as
       gettimeofday, it returns invalid timestamp, which is
       not updated, when net_bh is active.
     */
    
    /* General note about internal clock.
    
       Any clock source returns time intervals, measured in units
       close to 1usec. With source CONFIG_NET_SCH_CLK_GETTIMEOFDAY it is precisely
       microseconds, otherwise something close but different chosen to minimize
       arithmetic cost. Ratio usec/internal untis in form nominator/denominator
       may be read from /proc/net/psched.
     */
    
    
    #ifdef CONFIG_NET_SCH_CLK_GETTIMEOFDAY
    
    typedef struct timeval	psched_time_t;
    typedef long		psched_tdiff_t;
    
    #define PSCHED_GET_TIME(stamp) do_gettimeofday(&(stamp))
    #define PSCHED_US2JIFFIE(usecs) (((usecs)+(1000000/HZ-1))/(1000000/HZ))
    #define PSCHED_JIFFIE2US(delay) ((delay)*(1000000/HZ))
    
    #else /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */
    
    typedef u64	psched_time_t;
    typedef long	psched_tdiff_t;
    
    #ifdef CONFIG_NET_SCH_CLK_JIFFIES
    
    #if HZ < 96
    #define PSCHED_JSCALE 14
    #elif HZ >= 96 && HZ < 192
    #define PSCHED_JSCALE 13
    #elif HZ >= 192 && HZ < 384
    #define PSCHED_JSCALE 12
    #elif HZ >= 384 && HZ < 768
    #define PSCHED_JSCALE 11
    #elif HZ >= 768
    #define PSCHED_JSCALE 10
    #endif
    
    #define PSCHED_GET_TIME(stamp) ((stamp) = (get_jiffies_64()<<PSCHED_JSCALE))
    #define PSCHED_US2JIFFIE(delay) (((delay)+(1<<PSCHED_JSCALE)-1)>>PSCHED_JSCALE)
    #define PSCHED_JIFFIE2US(delay) ((delay)<<PSCHED_JSCALE)
    
    #endif /* CONFIG_NET_SCH_CLK_JIFFIES */
    #ifdef CONFIG_NET_SCH_CLK_CPU
    #include <asm/timex.h>
    
    extern psched_tdiff_t psched_clock_per_hz;
    extern int psched_clock_scale;
    extern psched_time_t psched_time_base;
    extern cycles_t psched_time_mark;
    
    #define PSCHED_GET_TIME(stamp)						\
    do {									\
    	cycles_t cur = get_cycles();					\
    	if (sizeof(cycles_t) == sizeof(u32)) {				\
    		if (cur <= psched_time_mark)				\
    			psched_time_base += 0x100000000ULL;		\
    		psched_time_mark = cur;					\
    		(stamp) = (psched_time_base + cur)>>psched_clock_scale;	\
    	} else {							\
    		(stamp) = cur>>psched_clock_scale;			\
    	}								\
    } while (0)
    #define PSCHED_US2JIFFIE(delay) (((delay)+psched_clock_per_hz-1)/psched_clock_per_hz)
    #define PSCHED_JIFFIE2US(delay) ((delay)*psched_clock_per_hz)
    
    #endif /* CONFIG_NET_SCH_CLK_CPU */
    
    #endif /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */
    
    #ifdef CONFIG_NET_SCH_CLK_GETTIMEOFDAY
    #define PSCHED_TDIFF(tv1, tv2) \
    ({ \
    	   int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \
    	   int __delta = (tv1).tv_usec - (tv2).tv_usec; \
    	   if (__delta_sec) { \
    	           switch (__delta_sec) { \
    		   default: \
    			   __delta = 0; \
    		   case 2: \
    			   __delta += 1000000; \
    		   case 1: \
    			   __delta += 1000000; \
    	           } \
    	   } \
    	   __delta; \
    })
    
    static inline int
    psched_tod_diff(int delta_sec, int bound)
    {
    	int delta;
    
    	if (bound <= 1000000 || delta_sec > (0x7FFFFFFF/1000000)-1)
    		return bound;
    	delta = delta_sec * 1000000;
    	if (delta > bound || delta < 0)
    		delta = bound;
    	return delta;
    }
    
    #define PSCHED_TDIFF_SAFE(tv1, tv2, bound) \
    ({ \
    	   int __delta_sec = (tv1).tv_sec - (tv2).tv_sec; \
    	   int __delta = (tv1).tv_usec - (tv2).tv_usec; \
    	   switch (__delta_sec) { \
    	   default: \
    		   __delta = psched_tod_diff(__delta_sec, bound);  break; \
    	   case 2: \
    		   __delta += 1000000; \
    	   case 1: \
    		   __delta += 1000000; \
    	   case 0: \
     		   if (__delta > bound || __delta < 0) \
     			__delta = bound; \
    	   } \
    	   __delta; \
    })
    
    #define PSCHED_TLESS(tv1, tv2) (((tv1).tv_usec < (tv2).tv_usec && \
    				(tv1).tv_sec <= (tv2).tv_sec) || \
    				 (tv1).tv_sec < (tv2).tv_sec)
    
    #define PSCHED_TADD2(tv, delta, tv_res) \
    ({ \
    	   int __delta = (tv).tv_usec + (delta); \
    	   (tv_res).tv_sec = (tv).tv_sec; \
    	   if (__delta > 1000000) { (tv_res).tv_sec++; __delta -= 1000000; } \
    	   (tv_res).tv_usec = __delta; \
    })
    
    #define PSCHED_TADD(tv, delta) \
    ({ \
    	   (tv).tv_usec += (delta); \
    	   if ((tv).tv_usec > 1000000) { (tv).tv_sec++; \
    		 (tv).tv_usec -= 1000000; } \
    })
    
    /* Set/check that time is in the "past perfect";
       it depends on concrete representation of system time
     */
    
    #define PSCHED_SET_PASTPERFECT(t)	((t).tv_sec = 0)
    #define PSCHED_IS_PASTPERFECT(t)	((t).tv_sec == 0)
    
    #define	PSCHED_AUDIT_TDIFF(t) ({ if ((t) > 2000000) (t) = 2000000; })
    
    #else /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */
    
    #define PSCHED_TDIFF(tv1, tv2) (long)((tv1) - (tv2))
    #define PSCHED_TDIFF_SAFE(tv1, tv2, bound) \
    	min_t(long long, (tv1) - (tv2), bound)
    
    
    #define PSCHED_TLESS(tv1, tv2) ((tv1) < (tv2))
    #define PSCHED_TADD2(tv, delta, tv_res) ((tv_res) = (tv) + (delta))
    #define PSCHED_TADD(tv, delta) ((tv) += (delta))
    #define PSCHED_SET_PASTPERFECT(t)	((t) = 0)
    #define PSCHED_IS_PASTPERFECT(t)	((t) == 0)
    #define	PSCHED_AUDIT_TDIFF(t)
    
    #endif /* !CONFIG_NET_SCH_CLK_GETTIMEOFDAY */
    
    extern struct Qdisc_ops pfifo_qdisc_ops;
    extern struct Qdisc_ops bfifo_qdisc_ops;
    
    extern int register_qdisc(struct Qdisc_ops *qops);
    extern int unregister_qdisc(struct Qdisc_ops *qops);
    extern struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
    extern struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
    extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
    		struct rtattr *tab);
    extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
    
    extern int qdisc_restart(struct net_device *dev);
    
    static inline void qdisc_run(struct net_device *dev)
    {
    	while (!netif_queue_stopped(dev) && qdisc_restart(dev) < 0)
    		/* NOTHING */;
    }
    
    extern int tc_classify(struct sk_buff *skb, struct tcf_proto *tp,
    	struct tcf_result *res);
    
    /* Calculate maximal size of packet seen by hard_start_xmit
       routine of this device.
     */
    static inline unsigned psched_mtu(struct net_device *dev)
    {
    	unsigned mtu = dev->mtu;
    	return dev->hard_header ? mtu + dev->hard_header_len : mtu;
    }
    
    #endif