/* * net/sched/sch_gred.c Generic Random Early Detection queue. * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Authors: J Hadi Salim (hadi@cyberus.ca) 1998-2002 * * 991129: - Bug fix with grio mode * - a better sing. AvgQ mode with Grio(WRED) * - A finer grained VQ dequeue based on sugestion * from Ren Liu * - More error checks * * For all the glorious comments look at include/net/red.h */ #include #include #include #include #include #include #include #define GRED_DEF_PRIO (MAX_DPs / 2) #define GRED_VQ_MASK (MAX_DPs - 1) struct gred_sched_data; struct gred_sched; struct gred_sched_data { u32 limit; /* HARD maximal queue length */ u32 DP; /* the drop parameters */ u32 bytesin; /* bytes seen on virtualQ so far*/ u32 packetsin; /* packets seen on virtualQ so far*/ u32 backlog; /* bytes on the virtualQ */ u8 prio; /* the prio of this vq */ struct red_parms parms; struct red_vars vars; struct red_stats stats; }; enum { GRED_WRED_MODE = 1, GRED_RIO_MODE, }; struct gred_sched { struct gred_sched_data *tab[MAX_DPs]; unsigned long flags; u32 red_flags; u32 DPs; u32 def; struct red_vars wred_set; }; static inline int gred_wred_mode(struct gred_sched *table) { return test_bit(GRED_WRED_MODE, &table->flags); } static inline void gred_enable_wred_mode(struct gred_sched *table) { __set_bit(GRED_WRED_MODE, &table->flags); } static inline void gred_disable_wred_mode(struct gred_sched *table) { __clear_bit(GRED_WRED_MODE, &table->flags); } static inline int gred_rio_mode(struct gred_sched *table) { return test_bit(GRED_RIO_MODE, &table->flags); } static inline void gred_enable_rio_mode(struct gred_sched *table) { __set_bit(GRED_RIO_MODE, &table->flags); } static inline void gred_disable_rio_mode(struct gred_sched *table) { __clear_bit(GRED_RIO_MODE, &table->flags); } static inline int gred_wred_mode_check(struct Qdisc *sch) { struct gred_sched *table = qdisc_priv(sch); int i; /* Really ugly O(n^2) but shouldn't be necessary too frequent. */ for (i = 0; i < table->DPs; i++) { struct gred_sched_data *q = table->tab[i]; int n; if (q == NULL) continue; for (n = i + 1; n < table->DPs; n++) if (table->tab[n] && table->tab[n]->prio == q->prio) return 1; } return 0; } static inline unsigned int gred_backlog(struct gred_sched *table, struct gred_sched_data *q, struct Qdisc *sch) { if (gred_wred_mode(table)) return sch->qstats.backlog; else return q->backlog; } static inline u16 tc_index_to_dp(struct sk_buff *skb) { return skb->tc_index & GRED_VQ_MASK; } static inline void gred_load_wred_set(const struct gred_sched *table, struct gred_sched_data *q) { q->vars.qavg = table->wred_set.qavg; q->vars.qidlestart = table->wred_set.qidlestart; } static inline void gred_store_wred_set(struct gred_sched *table, struct gred_sched_data *q) { table->wred_set.qavg = q->vars.qavg; table->wred_set.qidlestart = q->vars.qidlestart; } static inline int gred_use_ecn(struct gred_sched *t) { return t->red_flags & TC_RED_ECN; } static inline int gred_use_harddrop(struct gred_sched *t) { return t->red_flags & TC_RED_HARDDROP; } static int gred_enqueue(struct sk_buff *skb, struct Qdisc *sch) { struct gred_sched_data *q = NULL; struct gred_sched *t = qdisc_priv(sch); unsigned long qavg = 0; u16 dp = tc_index_to_dp(skb); if (dp >= t->DPs || (q = t->tab[dp]) == NULL) { dp = t->def; q = t->tab[dp]; if (!q) { /* Pass through packets not assigned to a DP * if no default DP has been configured. This * allows for DP flows to be left untouched. */ if (skb_queue_len(&sch->q) < qdisc_dev(sch)->tx_queue_len) return qdisc_enqueue_tail(skb, sch); else goto drop; } /* fix tc_index? --could be controversial but needed for requeueing */ skb->tc_index = (skb->tc_index & ~GRED_VQ_MASK) | dp; } /* sum up all the qaves of prios < ours to get the new qave */ if 
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INSTALL_BIN_PATH: "/opt/nsb_bin"