cake_dump_stats() and cake_dump_class_stats() run without qdisc spinlock being held. Add READ_ONCE()/WRITE_ONCE() annotations. Fixes: 046f6fd5daef ("sched: Add Common Applications Kept Enhanced (cake) qdisc") Signed-off-by: Eric Dumazet Cc: "Toke Høiland-Jørgensen" --- net/sched/sch_cake.c | 337 ++++++++++++++++++++++++------------------- 1 file changed, 189 insertions(+), 148 deletions(-) diff --git a/net/sched/sch_cake.c b/net/sched/sch_cake.c index 0104c29b20f8e43ffa025f0eb58bfe4e2b801010..fcc3c6b1044f324b399c9e80340fea3429e37c16 100644 --- a/net/sched/sch_cake.c +++ b/net/sched/sch_cake.c @@ -449,14 +449,17 @@ static bool cobalt_queue_full(struct cobalt_vars *vars, bool up = false; if (ktime_to_ns(ktime_sub(now, vars->blue_timer)) > p->target) { - up = !vars->p_drop; - vars->p_drop += p->p_inc; - if (vars->p_drop < p->p_inc) - vars->p_drop = ~0; - vars->blue_timer = now; - } - vars->dropping = true; - vars->drop_next = now; + u32 p_drop = vars->p_drop; + + up = !p_drop; + p_drop += p->p_inc; + if (p_drop < p->p_inc) + p_drop = ~0; + WRITE_ONCE(vars->p_drop, p_drop); + WRITE_ONCE(vars->blue_timer, now); + } + WRITE_ONCE(vars->dropping, true); + WRITE_ONCE(vars->drop_next, now); if (!vars->count) vars->count = 1; @@ -474,21 +477,25 @@ static bool cobalt_queue_empty(struct cobalt_vars *vars, if (vars->p_drop && ktime_to_ns(ktime_sub(now, vars->blue_timer)) > p->target) { - if (vars->p_drop < p->p_dec) - vars->p_drop = 0; + u32 p_drop = vars->p_drop; + + if (p_drop < p->p_dec) + p_drop = 0; else - vars->p_drop -= p->p_dec; - vars->blue_timer = now; - down = !vars->p_drop; + p_drop -= p->p_dec; + WRITE_ONCE(vars->p_drop, p_drop); + WRITE_ONCE(vars->blue_timer, now); + down = !p_drop; } - vars->dropping = false; + WRITE_ONCE(vars->dropping, false); if (vars->count && ktime_to_ns(ktime_sub(now, vars->drop_next)) >= 0) { vars->count--; cobalt_invsqrt(vars); - vars->drop_next = cobalt_control(vars->drop_next, - p->interval, - vars->rec_inv_sqrt); + WRITE_ONCE(vars->drop_next, + cobalt_control(vars->drop_next, + p->interval, + vars->rec_inv_sqrt)); } return down; @@ -534,37 +541,41 @@ static enum qdisc_drop_reason cobalt_should_drop(struct cobalt_vars *vars, if (over_target) { if (!vars->dropping) { - vars->dropping = true; - vars->drop_next = cobalt_control(now, - p->interval, - vars->rec_inv_sqrt); + WRITE_ONCE(vars->dropping, true); + WRITE_ONCE(vars->drop_next, + cobalt_control(now, + p->interval, + vars->rec_inv_sqrt)); } if (!vars->count) vars->count = 1; } else if (vars->dropping) { - vars->dropping = false; + WRITE_ONCE(vars->dropping, false); } if (next_due && vars->dropping) { /* Use ECN mark if possible, otherwise drop */ - if (!(vars->ecn_marked = INET_ECN_set_ce(skb))) + vars->ecn_marked = INET_ECN_set_ce(skb); + if (!vars->ecn_marked) reason = QDISC_DROP_CONGESTED; vars->count++; if (!vars->count) vars->count--; cobalt_invsqrt(vars); - vars->drop_next = cobalt_control(vars->drop_next, - p->interval, - vars->rec_inv_sqrt); + WRITE_ONCE(vars->drop_next, + cobalt_control(vars->drop_next, + p->interval, + vars->rec_inv_sqrt)); schedule = ktime_sub(now, vars->drop_next); } else { while (next_due) { vars->count--; cobalt_invsqrt(vars); - vars->drop_next = cobalt_control(vars->drop_next, - p->interval, - vars->rec_inv_sqrt); + WRITE_ONCE(vars->drop_next, + cobalt_control(vars->drop_next, + p->interval, + vars->rec_inv_sqrt)); schedule = ktime_sub(now, vars->drop_next); next_due = vars->count && ktime_to_ns(schedule) >= 0; } @@ -577,9 +588,9 @@ static enum qdisc_drop_reason cobalt_should_drop(struct cobalt_vars *vars, /* Overload the drop_next field as an activity timeout */ if (!vars->count) - vars->drop_next = ktime_add_ns(now, p->interval); + WRITE_ONCE(vars->drop_next, ktime_add_ns(now, p->interval)); else if (ktime_to_ns(schedule) > 0 && reason == QDISC_DROP_UNSPEC) - vars->drop_next = now; + WRITE_ONCE(vars->drop_next, now); return reason; } @@ -813,7 +824,7 @@ static u32 cake_hash(struct cake_tin_data *q, const struct sk_buff *skb, i++, k = (k + 1) % CAKE_SET_WAYS) { if (q->tags[outer_hash + k] == flow_hash) { if (i) - q->way_hits++; + WRITE_ONCE(q->way_hits, q->way_hits + 1); if (!q->flows[outer_hash + k].set) { /* need to increment host refcnts */ @@ -831,7 +842,7 @@ static u32 cake_hash(struct cake_tin_data *q, const struct sk_buff *skb, for (i = 0; i < CAKE_SET_WAYS; i++, k = (k + 1) % CAKE_SET_WAYS) { if (!q->flows[outer_hash + k].set) { - q->way_misses++; + WRITE_ONCE(q->way_misses, q->way_misses + 1); allocate_src = cake_dsrc(flow_mode); allocate_dst = cake_ddst(flow_mode); goto found; @@ -841,7 +852,7 @@ static u32 cake_hash(struct cake_tin_data *q, const struct sk_buff *skb, /* With no empty queues, default to the original * queue, accept the collision, update the host tags. */ - q->way_collisions++; + WRITE_ONCE(q->way_collisions, q->way_collisions + 1); allocate_src = cake_dsrc(flow_mode); allocate_dst = cake_ddst(flow_mode); @@ -875,7 +886,8 @@ static u32 cake_hash(struct cake_tin_data *q, const struct sk_buff *skb, q->flows[reduced_hash].srchost = srchost_idx; if (q->flows[reduced_hash].set == CAKE_SET_BULK) - cake_inc_srchost_bulk_flow_count(q, &q->flows[reduced_hash], flow_mode); + cake_inc_srchost_bulk_flow_count(q, &q->flows[reduced_hash], + flow_mode); } if (allocate_dst) { @@ -899,7 +911,8 @@ static u32 cake_hash(struct cake_tin_data *q, const struct sk_buff *skb, q->flows[reduced_hash].dsthost = dsthost_idx; if (q->flows[reduced_hash].set == CAKE_SET_BULK) - cake_inc_dsthost_bulk_flow_count(q, &q->flows[reduced_hash], flow_mode); + cake_inc_dsthost_bulk_flow_count(q, &q->flows[reduced_hash], + flow_mode); } } @@ -1379,9 +1392,9 @@ static u32 cake_calc_overhead(struct cake_sched_data *qd, u32 len, u32 off) len -= off; if (qd->max_netlen < len) - qd->max_netlen = len; + WRITE_ONCE(qd->max_netlen, len); if (qd->min_netlen > len) - qd->min_netlen = len; + WRITE_ONCE(qd->min_netlen, len); len += q->rate_overhead; @@ -1401,9 +1414,9 @@ static u32 cake_calc_overhead(struct cake_sched_data *qd, u32 len, u32 off) } if (qd->max_adjlen < len) - qd->max_adjlen = len; + WRITE_ONCE(qd->max_adjlen, len); if (qd->min_adjlen > len) - qd->min_adjlen = len; + WRITE_ONCE(qd->min_adjlen, len); return len; } @@ -1416,7 +1429,7 @@ static u32 cake_overhead(struct cake_sched_data *q, const struct sk_buff *skb) u16 segs = qdisc_pkt_segs(skb); u32 len = qdisc_pkt_len(skb); - q->avg_netoff = cake_ewma(q->avg_netoff, off << 16, 8); + WRITE_ONCE(q->avg_netoff, cake_ewma(q->avg_netoff, off << 16, 8)); if (segs == 1) return cake_calc_overhead(q, len, off); @@ -1590,16 +1603,17 @@ static unsigned int cake_drop(struct Qdisc *sch, struct sk_buff **to_free) } if (cobalt_queue_full(&flow->cvars, &b->cparams, now)) - b->unresponsive_flow_count++; + WRITE_ONCE(b->unresponsive_flow_count, + b->unresponsive_flow_count + 1); len = qdisc_pkt_len(skb); q->buffer_used -= skb->truesize; - b->backlogs[idx] -= len; - b->tin_backlog -= len; + WRITE_ONCE(b->backlogs[idx], b->backlogs[idx] - len); + WRITE_ONCE(b->tin_backlog, b->tin_backlog - len); qstats_backlog_sub(sch, len); - flow->dropped++; - b->tin_dropped++; + WRITE_ONCE(flow->dropped, flow->dropped + 1); + WRITE_ONCE(b->tin_dropped, b->tin_dropped + 1); if (q->config->rate_flags & CAKE_FLAG_INGRESS) cake_advance_shaper(q, b, skb, now, true); @@ -1795,7 +1809,7 @@ static s32 cake_enqueue(struct sk_buff *skb, struct Qdisc *sch, } if (unlikely(len > b->max_skblen)) - b->max_skblen = len; + WRITE_ONCE(b->max_skblen, len); if (qdisc_pkt_segs(skb) > 1 && q->config->rate_flags & CAKE_FLAG_SPLIT_GSO) { struct sk_buff *segs, *nskb; @@ -1819,13 +1833,13 @@ static s32 cake_enqueue(struct sk_buff *skb, struct Qdisc *sch, numsegs++; slen += segs->len; q->buffer_used += segs->truesize; - b->packets++; } /* stats */ - b->bytes += slen; - b->backlogs[idx] += slen; - b->tin_backlog += slen; + WRITE_ONCE(b->bytes, b->bytes + slen); + WRITE_ONCE(b->packets, b->packets + numsegs); + WRITE_ONCE(b->backlogs[idx], b->backlogs[idx] + slen); + WRITE_ONCE(b->tin_backlog, b->tin_backlog + slen); qstats_backlog_add(sch, slen); q->avg_window_bytes += slen; @@ -1843,7 +1857,7 @@ static s32 cake_enqueue(struct sk_buff *skb, struct Qdisc *sch, ack = cake_ack_filter(q, flow); if (ack) { - b->ack_drops++; + WRITE_ONCE(b->ack_drops, b->ack_drops + 1); sch->qstats.drops++; ack_pkt_len = qdisc_pkt_len(ack); b->bytes += ack_pkt_len; @@ -1859,10 +1873,10 @@ static s32 cake_enqueue(struct sk_buff *skb, struct Qdisc *sch, } /* stats */ - b->packets++; - b->bytes += len - ack_pkt_len; - b->backlogs[idx] += len - ack_pkt_len; - b->tin_backlog += len - ack_pkt_len; + WRITE_ONCE(b->packets, b->packets + 1); + WRITE_ONCE(b->bytes, b->bytes + len - ack_pkt_len); + WRITE_ONCE(b->backlogs[idx], b->backlogs[idx] + len - ack_pkt_len); + WRITE_ONCE(b->tin_backlog, b->tin_backlog + len - ack_pkt_len); qstats_backlog_add(sch, len - ack_pkt_len); q->avg_window_bytes += len - ack_pkt_len; } @@ -1917,27 +1931,30 @@ static s32 cake_enqueue(struct sk_buff *skb, struct Qdisc *sch, if (!flow->set) { list_add_tail(&flow->flowchain, &b->new_flows); } else { - b->decaying_flow_count--; + WRITE_ONCE(b->decaying_flow_count, + b->decaying_flow_count - 1); list_move_tail(&flow->flowchain, &b->new_flows); } flow->set = CAKE_SET_SPARSE; - b->sparse_flow_count++; + WRITE_ONCE(b->sparse_flow_count, + b->sparse_flow_count + 1); - flow->deficit = cake_get_flow_quantum(b, flow, q->config->flow_mode); + WRITE_ONCE(flow->deficit, + cake_get_flow_quantum(b, flow, q->config->flow_mode)); } else if (flow->set == CAKE_SET_SPARSE_WAIT) { /* this flow was empty, accounted as a sparse flow, but actually * in the bulk rotation. */ flow->set = CAKE_SET_BULK; - b->sparse_flow_count--; - b->bulk_flow_count++; + WRITE_ONCE(b->sparse_flow_count, b->sparse_flow_count - 1); + WRITE_ONCE(b->bulk_flow_count, b->bulk_flow_count + 1); cake_inc_srchost_bulk_flow_count(b, flow, q->config->flow_mode); cake_inc_dsthost_bulk_flow_count(b, flow, q->config->flow_mode); } if (q->buffer_used > q->buffer_max_used) - q->buffer_max_used = q->buffer_used; + WRITE_ONCE(q->buffer_max_used, q->buffer_used); if (q->buffer_used <= q->buffer_limit) return NET_XMIT_SUCCESS; @@ -1976,8 +1993,8 @@ static struct sk_buff *cake_dequeue_one(struct Qdisc *sch) if (flow->head) { skb = dequeue_head(flow); len = qdisc_pkt_len(skb); - b->backlogs[q->cur_flow] -= len; - b->tin_backlog -= len; + WRITE_ONCE(b->backlogs[q->cur_flow], b->backlogs[q->cur_flow] - len); + WRITE_ONCE(b->tin_backlog, b->tin_backlog - len); qstats_backlog_sub(sch, len); q->buffer_used -= skb->truesize; qdisc_qlen_dec(sch); @@ -2042,7 +2059,7 @@ static struct sk_buff *cake_dequeue(struct Qdisc *sch) cake_configure_rates(sch, new_rate, true); q->last_checked_active = now; - q->active_queues = num_active_qs; + WRITE_ONCE(q->active_queues, num_active_qs); } begin: @@ -2149,8 +2166,10 @@ static struct sk_buff *cake_dequeue(struct Qdisc *sch) */ if (flow->set == CAKE_SET_SPARSE) { if (flow->head) { - b->sparse_flow_count--; - b->bulk_flow_count++; + WRITE_ONCE(b->sparse_flow_count, + b->sparse_flow_count - 1); + WRITE_ONCE(b->bulk_flow_count, + b->bulk_flow_count + 1); cake_inc_srchost_bulk_flow_count(b, flow, q->config->flow_mode); cake_inc_dsthost_bulk_flow_count(b, flow, q->config->flow_mode); @@ -2165,7 +2184,8 @@ static struct sk_buff *cake_dequeue(struct Qdisc *sch) } } - flow->deficit += cake_get_flow_quantum(b, flow, q->config->flow_mode); + WRITE_ONCE(flow->deficit, + flow->deficit + cake_get_flow_quantum(b, flow, q->config->flow_mode)); list_move_tail(&flow->flowchain, &b->old_flows); goto retry; @@ -2187,16 +2207,22 @@ static struct sk_buff *cake_dequeue(struct Qdisc *sch) list_move_tail(&flow->flowchain, &b->decaying_flows); if (flow->set == CAKE_SET_BULK) { - b->bulk_flow_count--; + WRITE_ONCE(b->bulk_flow_count, + b->bulk_flow_count - 1); - cake_dec_srchost_bulk_flow_count(b, flow, q->config->flow_mode); - cake_dec_dsthost_bulk_flow_count(b, flow, q->config->flow_mode); + cake_dec_srchost_bulk_flow_count(b, flow, + q->config->flow_mode); + cake_dec_dsthost_bulk_flow_count(b, flow, + q->config->flow_mode); - b->decaying_flow_count++; + WRITE_ONCE(b->decaying_flow_count, + b->decaying_flow_count + 1); } else if (flow->set == CAKE_SET_SPARSE || flow->set == CAKE_SET_SPARSE_WAIT) { - b->sparse_flow_count--; - b->decaying_flow_count++; + WRITE_ONCE(b->sparse_flow_count, + b->sparse_flow_count - 1); + WRITE_ONCE(b->decaying_flow_count, + b->decaying_flow_count + 1); } flow->set = CAKE_SET_DECAYING; } else { @@ -2204,14 +2230,20 @@ static struct sk_buff *cake_dequeue(struct Qdisc *sch) list_del_init(&flow->flowchain); if (flow->set == CAKE_SET_SPARSE || flow->set == CAKE_SET_SPARSE_WAIT) - b->sparse_flow_count--; + WRITE_ONCE(b->sparse_flow_count, + b->sparse_flow_count - 1); else if (flow->set == CAKE_SET_BULK) { - b->bulk_flow_count--; + WRITE_ONCE(b->bulk_flow_count, + b->bulk_flow_count - 1); - cake_dec_srchost_bulk_flow_count(b, flow, q->config->flow_mode); - cake_dec_dsthost_bulk_flow_count(b, flow, q->config->flow_mode); - } else - b->decaying_flow_count--; + cake_dec_srchost_bulk_flow_count(b, flow, + q->config->flow_mode); + cake_dec_dsthost_bulk_flow_count(b, flow, + q->config->flow_mode); + } else { + WRITE_ONCE(b->decaying_flow_count, + b->decaying_flow_count - 1); + } flow->set = CAKE_SET_NONE; } @@ -2230,11 +2262,11 @@ static struct sk_buff *cake_dequeue(struct Qdisc *sch) if (q->config->rate_flags & CAKE_FLAG_INGRESS) { len = cake_advance_shaper(q, b, skb, now, true); - flow->deficit -= len; + WRITE_ONCE(flow->deficit, flow->deficit - len); b->tin_deficit -= len; } - flow->dropped++; - b->tin_dropped++; + WRITE_ONCE(flow->dropped, flow->dropped + 1); + WRITE_ONCE(b->tin_dropped, b->tin_dropped + 1); qdisc_tree_reduce_backlog(sch, 1, qdisc_pkt_len(skb)); qdisc_qstats_drop(sch); qdisc_dequeue_drop(sch, skb, reason); @@ -2242,20 +2274,22 @@ static struct sk_buff *cake_dequeue(struct Qdisc *sch) goto retry; } - b->tin_ecn_mark += !!flow->cvars.ecn_marked; + WRITE_ONCE(b->tin_ecn_mark, b->tin_ecn_mark + !!flow->cvars.ecn_marked); qdisc_bstats_update(sch, skb); WRITE_ONCE(q->last_active, now); /* collect delay stats */ delay = ktime_to_ns(ktime_sub(now, cobalt_get_enqueue_time(skb))); - b->avge_delay = cake_ewma(b->avge_delay, delay, 8); - b->peak_delay = cake_ewma(b->peak_delay, delay, - delay > b->peak_delay ? 2 : 8); - b->base_delay = cake_ewma(b->base_delay, delay, - delay < b->base_delay ? 2 : 8); + WRITE_ONCE(b->avge_delay, cake_ewma(b->avge_delay, delay, 8)); + WRITE_ONCE(b->peak_delay, + cake_ewma(b->peak_delay, delay, + delay > b->peak_delay ? 2 : 8)); + WRITE_ONCE(b->base_delay, + cake_ewma(b->base_delay, delay, + delay < b->base_delay ? 2 : 8)); len = cake_advance_shaper(q, b, skb, now, false); - flow->deficit -= len; + WRITE_ONCE(flow->deficit, flow->deficit - len); b->tin_deficit -= len; if (ktime_after(q->time_next_packet, now) && sch->q.qlen) { @@ -2329,9 +2363,8 @@ static void cake_set_rate(struct cake_tin_data *b, u64 rate, u32 mtu, u8 rate_shft = 0; u64 rate_ns = 0; - b->flow_quantum = 1514; if (rate) { - b->flow_quantum = max(min(rate >> 12, 1514ULL), 300ULL); + WRITE_ONCE(b->flow_quantum, max(min(rate >> 12, 1514ULL), 300ULL)); rate_shft = 34; rate_ns = ((u64)NSEC_PER_SEC) << rate_shft; rate_ns = div64_u64(rate_ns, max(MIN_RATE, rate)); @@ -2339,8 +2372,10 @@ static void cake_set_rate(struct cake_tin_data *b, u64 rate, u32 mtu, rate_ns >>= 1; rate_shft--; } - } /* else unlimited, ie. zero delay */ - + } else { + /* else unlimited, ie. zero delay */ + WRITE_ONCE(b->flow_quantum, 1514); + } b->tin_rate_bps = rate; b->tin_rate_ns = rate_ns; b->tin_rate_shft = rate_shft; @@ -2611,25 +2646,27 @@ static void cake_reconfigure(struct Qdisc *sch) { struct cake_sched_data *qd = qdisc_priv(sch); struct cake_sched_config *q = qd->config; + u32 buffer_limit; cake_configure_rates(sch, qd->config->rate_bps, false); if (q->buffer_config_limit) { - qd->buffer_limit = q->buffer_config_limit; + buffer_limit = q->buffer_config_limit; } else if (q->rate_bps) { u64 t = q->rate_bps * q->interval; do_div(t, USEC_PER_SEC / 4); - qd->buffer_limit = max_t(u32, t, 4U << 20); + buffer_limit = max_t(u32, t, 4U << 20); } else { - qd->buffer_limit = ~0; + buffer_limit = ~0; } sch->flags &= ~TCQ_F_CAN_BYPASS; - qd->buffer_limit = min(qd->buffer_limit, - max(sch->limit * psched_mtu(qdisc_dev(sch)), - q->buffer_config_limit)); + WRITE_ONCE(qd->buffer_limit, + min(buffer_limit, + max(sch->limit * psched_mtu(qdisc_dev(sch)), + q->buffer_config_limit))); } static int cake_config_change(struct cake_sched_config *q, struct nlattr *opt, @@ -2774,10 +2811,10 @@ static int cake_change(struct Qdisc *sch, struct nlattr *opt, return ret; if (overhead_changed) { - qd->max_netlen = 0; - qd->max_adjlen = 0; - qd->min_netlen = ~0; - qd->min_adjlen = ~0; + WRITE_ONCE(qd->max_netlen, 0); + WRITE_ONCE(qd->max_adjlen, 0); + WRITE_ONCE(qd->min_netlen, ~0); + WRITE_ONCE(qd->min_adjlen, ~0); } if (qd->tins) { @@ -2995,15 +3032,15 @@ static int cake_dump_stats(struct Qdisc *sch, struct gnet_dump *d) goto nla_put_failure; \ } while (0) - PUT_STAT_U64(CAPACITY_ESTIMATE64, q->avg_peak_bandwidth); - PUT_STAT_U32(MEMORY_LIMIT, q->buffer_limit); - PUT_STAT_U32(MEMORY_USED, q->buffer_max_used); - PUT_STAT_U32(AVG_NETOFF, ((q->avg_netoff + 0x8000) >> 16)); - PUT_STAT_U32(MAX_NETLEN, q->max_netlen); - PUT_STAT_U32(MAX_ADJLEN, q->max_adjlen); - PUT_STAT_U32(MIN_NETLEN, q->min_netlen); - PUT_STAT_U32(MIN_ADJLEN, q->min_adjlen); - PUT_STAT_U32(ACTIVE_QUEUES, q->active_queues); + PUT_STAT_U64(CAPACITY_ESTIMATE64, READ_ONCE(q->avg_peak_bandwidth)); + PUT_STAT_U32(MEMORY_LIMIT, READ_ONCE(q->buffer_limit)); + PUT_STAT_U32(MEMORY_USED, READ_ONCE(q->buffer_max_used)); + PUT_STAT_U32(AVG_NETOFF, ((READ_ONCE(q->avg_netoff) + 0x8000) >> 16)); + PUT_STAT_U32(MAX_NETLEN, READ_ONCE(q->max_netlen)); + PUT_STAT_U32(MAX_ADJLEN, READ_ONCE(q->max_adjlen)); + PUT_STAT_U32(MIN_NETLEN, READ_ONCE(q->min_netlen)); + PUT_STAT_U32(MIN_ADJLEN, READ_ONCE(q->min_adjlen)); + PUT_STAT_U32(ACTIVE_QUEUES, READ_ONCE(q->active_queues)); #undef PUT_STAT_U32 #undef PUT_STAT_U64 @@ -3029,38 +3066,38 @@ static int cake_dump_stats(struct Qdisc *sch, struct gnet_dump *d) if (!ts) goto nla_put_failure; - PUT_TSTAT_U64(THRESHOLD_RATE64, b->tin_rate_bps); - PUT_TSTAT_U64(SENT_BYTES64, b->bytes); - PUT_TSTAT_U32(BACKLOG_BYTES, b->tin_backlog); + PUT_TSTAT_U64(THRESHOLD_RATE64, READ_ONCE(b->tin_rate_bps)); + PUT_TSTAT_U64(SENT_BYTES64, READ_ONCE(b->bytes)); + PUT_TSTAT_U32(BACKLOG_BYTES, READ_ONCE(b->tin_backlog)); PUT_TSTAT_U32(TARGET_US, - ktime_to_us(ns_to_ktime(b->cparams.target))); + ktime_to_us(ns_to_ktime(READ_ONCE(b->cparams.target)))); PUT_TSTAT_U32(INTERVAL_US, - ktime_to_us(ns_to_ktime(b->cparams.interval))); + ktime_to_us(ns_to_ktime(READ_ONCE(b->cparams.interval)))); - PUT_TSTAT_U32(SENT_PACKETS, b->packets); - PUT_TSTAT_U32(DROPPED_PACKETS, b->tin_dropped); - PUT_TSTAT_U32(ECN_MARKED_PACKETS, b->tin_ecn_mark); - PUT_TSTAT_U32(ACKS_DROPPED_PACKETS, b->ack_drops); + PUT_TSTAT_U32(SENT_PACKETS, READ_ONCE(b->packets)); + PUT_TSTAT_U32(DROPPED_PACKETS, READ_ONCE(b->tin_dropped)); + PUT_TSTAT_U32(ECN_MARKED_PACKETS, READ_ONCE(b->tin_ecn_mark)); + PUT_TSTAT_U32(ACKS_DROPPED_PACKETS, READ_ONCE(b->ack_drops)); PUT_TSTAT_U32(PEAK_DELAY_US, - ktime_to_us(ns_to_ktime(b->peak_delay))); + ktime_to_us(ns_to_ktime(READ_ONCE(b->peak_delay)))); PUT_TSTAT_U32(AVG_DELAY_US, - ktime_to_us(ns_to_ktime(b->avge_delay))); + ktime_to_us(ns_to_ktime(READ_ONCE(b->avge_delay)))); PUT_TSTAT_U32(BASE_DELAY_US, - ktime_to_us(ns_to_ktime(b->base_delay))); + ktime_to_us(ns_to_ktime(READ_ONCE(b->base_delay)))); - PUT_TSTAT_U32(WAY_INDIRECT_HITS, b->way_hits); - PUT_TSTAT_U32(WAY_MISSES, b->way_misses); - PUT_TSTAT_U32(WAY_COLLISIONS, b->way_collisions); + PUT_TSTAT_U32(WAY_INDIRECT_HITS, READ_ONCE(b->way_hits)); + PUT_TSTAT_U32(WAY_MISSES, READ_ONCE(b->way_misses)); + PUT_TSTAT_U32(WAY_COLLISIONS, READ_ONCE(b->way_collisions)); - PUT_TSTAT_U32(SPARSE_FLOWS, b->sparse_flow_count + - b->decaying_flow_count); - PUT_TSTAT_U32(BULK_FLOWS, b->bulk_flow_count); - PUT_TSTAT_U32(UNRESPONSIVE_FLOWS, b->unresponsive_flow_count); - PUT_TSTAT_U32(MAX_SKBLEN, b->max_skblen); + PUT_TSTAT_U32(SPARSE_FLOWS, READ_ONCE(b->sparse_flow_count) + + READ_ONCE(b->decaying_flow_count)); + PUT_TSTAT_U32(BULK_FLOWS, READ_ONCE(b->bulk_flow_count)); + PUT_TSTAT_U32(UNRESPONSIVE_FLOWS, READ_ONCE(b->unresponsive_flow_count)); + PUT_TSTAT_U32(MAX_SKBLEN, READ_ONCE(b->max_skblen)); - PUT_TSTAT_U32(FLOW_QUANTUM, b->flow_quantum); + PUT_TSTAT_U32(FLOW_QUANTUM, READ_ONCE(b->flow_quantum)); nla_nest_end(d->skb, ts); } @@ -3137,13 +3174,15 @@ static int cake_dump_class_stats(struct Qdisc *sch, unsigned long cl, } sch_tree_unlock(sch); } - qs.backlog = b->backlogs[idx % CAKE_QUEUES]; - qs.drops = flow->dropped; + qs.backlog = READ_ONCE(b->backlogs[idx % CAKE_QUEUES]); + qs.drops = READ_ONCE(flow->dropped); } if (gnet_stats_copy_queue(d, NULL, &qs, qs.qlen) < 0) return -1; if (flow) { ktime_t now = ktime_get(); + bool dropping; + u32 p_drop; stats = nla_nest_start_noflag(d->skb, TCA_STATS_APP); if (!stats) @@ -3158,21 +3197,23 @@ static int cake_dump_class_stats(struct Qdisc *sch, unsigned long cl, goto nla_put_failure; \ } while (0) - PUT_STAT_S32(DEFICIT, flow->deficit); - PUT_STAT_U32(DROPPING, flow->cvars.dropping); - PUT_STAT_U32(COBALT_COUNT, flow->cvars.count); - PUT_STAT_U32(P_DROP, flow->cvars.p_drop); - if (flow->cvars.p_drop) { + PUT_STAT_S32(DEFICIT, READ_ONCE(flow->deficit)); + dropping = READ_ONCE(flow->cvars.dropping); + PUT_STAT_U32(DROPPING, dropping); + PUT_STAT_U32(COBALT_COUNT, READ_ONCE(flow->cvars.count)); + p_drop = READ_ONCE(flow->cvars.p_drop); + PUT_STAT_U32(P_DROP, p_drop); + if (p_drop) { PUT_STAT_S32(BLUE_TIMER_US, ktime_to_us( ktime_sub(now, - flow->cvars.blue_timer))); + READ_ONCE(flow->cvars.blue_timer)))); } - if (flow->cvars.dropping) { + if (dropping) { PUT_STAT_S32(DROP_NEXT_US, ktime_to_us( ktime_sub(now, - flow->cvars.drop_next))); + READ_ONCE(flow->cvars.drop_next)))); } if (nla_nest_end(d->skb, stats) < 0) @@ -3298,10 +3339,10 @@ static int cake_mq_change(struct Qdisc *sch, struct nlattr *opt, struct cake_sched_data *qd = qdisc_priv(chld); if (overhead_changed) { - qd->max_netlen = 0; - qd->max_adjlen = 0; - qd->min_netlen = ~0; - qd->min_adjlen = ~0; + WRITE_ONCE(qd->max_netlen, 0); + WRITE_ONCE(qd->max_adjlen, 0); + WRITE_ONCE(qd->min_netlen, ~0); + WRITE_ONCE(qd->min_adjlen, ~0); } if (qd->tins) { -- 2.53.0.1213.gd9a14994de-goog