15 static void fq_adjust_removal(struct fq *fq,  in fq_adjust_removal()  argument
24 	fq->backlog--;  in fq_adjust_removal()
25 	fq->memory_usage -= skb->truesize;  in fq_adjust_removal()
28 static void fq_rejigger_backlog(struct fq *fq, struct fq_flow *flow)  in fq_rejigger_backlog()  argument
37 		list_for_each_entry_continue(i, &fq->backlogs, backlogchain)  in fq_rejigger_backlog()
46 static struct sk_buff *fq_flow_dequeue(struct fq *fq,  in fq_flow_dequeue()  argument
51 	lockdep_assert_held(&fq->lock);  in fq_flow_dequeue()
57 	fq_adjust_removal(fq, flow, skb);  in fq_flow_dequeue()
58 	fq_rejigger_backlog(fq, flow);  in fq_flow_dequeue()
63 static struct sk_buff *fq_tin_dequeue(struct fq *fq,  in fq_tin_dequeue()  argument
71 	lockdep_assert_held(&fq->lock);  in fq_tin_dequeue()
84 		flow->deficit += fq->quantum;  in fq_tin_dequeue()
90 	skb = dequeue_func(fq, tin, flow);  in fq_tin_dequeue()
110 static struct fq_flow *fq_flow_classify(struct fq *fq,  in fq_flow_classify()  argument
119 	lockdep_assert_held(&fq->lock);  in fq_flow_classify()
121 	hash = skb_get_hash_perturb(skb, fq->perturbation);  in fq_flow_classify()
122 	idx = reciprocal_scale(hash, fq->flows_cnt);  in fq_flow_classify()
123 	flow = &fq->flows[idx];  in fq_flow_classify()
126 		flow = get_default_func(fq, tin, idx, skb);  in fq_flow_classify()
128 		fq->collisions++;  in fq_flow_classify()
137 static void fq_recalc_backlog(struct fq *fq,  in fq_recalc_backlog()  argument
144 		list_add_tail(&flow->backlogchain, &fq->backlogs);  in fq_recalc_backlog()
147 	list_for_each_entry_continue_reverse(i, &fq->backlogs,  in fq_recalc_backlog()
155 static void fq_tin_enqueue(struct fq *fq,  in fq_tin_enqueue()  argument
164 	lockdep_assert_held(&fq->lock);  in fq_tin_enqueue()
166 	flow = fq_flow_classify(fq, tin, skb, get_default_func);  in fq_tin_enqueue()
172 	fq->memory_usage += skb->truesize;  in fq_tin_enqueue()
173 	fq->backlog++;  in fq_tin_enqueue()
175 	fq_recalc_backlog(fq, tin, flow);  in fq_tin_enqueue()
178 		flow->deficit = fq->quantum;  in fq_tin_enqueue()
184 	oom = (fq->memory_usage > fq->memory_limit);  in fq_tin_enqueue()
185 	while (fq->backlog > fq->limit || oom) {  in fq_tin_enqueue()
186 		flow = list_first_entry_or_null(&fq->backlogs,  in fq_tin_enqueue()
192 		skb = fq_flow_dequeue(fq, flow);  in fq_tin_enqueue()
196 		free_func(fq, flow->tin, flow, skb);  in fq_tin_enqueue()
199 		fq->overlimit++;  in fq_tin_enqueue()
201 			fq->overmemory++;  in fq_tin_enqueue()
202 			oom = (fq->memory_usage > fq->memory_limit);  in fq_tin_enqueue()
207 static void fq_flow_filter(struct fq *fq,  in fq_flow_filter()  argument
216 	lockdep_assert_held(&fq->lock);  in fq_flow_filter()
219 		if (!filter_func(fq, tin, flow, skb, filter_data))  in fq_flow_filter()
223 		fq_adjust_removal(fq, flow, skb);  in fq_flow_filter()
224 		free_func(fq, tin, flow, skb);  in fq_flow_filter()
227 	fq_rejigger_backlog(fq, flow);  in fq_flow_filter()
230 static void fq_tin_filter(struct fq *fq,  in fq_tin_filter()  argument
238 	lockdep_assert_held(&fq->lock);  in fq_tin_filter()
241 		fq_flow_filter(fq, flow, filter_func, filter_data, free_func);  in fq_tin_filter()
243 		fq_flow_filter(fq, flow, filter_func, filter_data, free_func);  in fq_tin_filter()
246 static void fq_flow_reset(struct fq *fq,  in fq_flow_reset()  argument
252 	while ((skb = fq_flow_dequeue(fq, flow)))  in fq_flow_reset()
253 		free_func(fq, flow->tin, flow, skb);  in fq_flow_reset()
266 static void fq_tin_reset(struct fq *fq,  in fq_tin_reset()  argument
282 		fq_flow_reset(fq, flow, free_func);  in fq_tin_reset()
302 static int fq_init(struct fq *fq, int flows_cnt)  in fq_init()  argument
306 	memset(fq, 0, sizeof(fq[0]));  in fq_init()
307 	INIT_LIST_HEAD(&fq->backlogs);  in fq_init()
308 	spin_lock_init(&fq->lock);  in fq_init()
309 	fq->flows_cnt = max_t(u32, flows_cnt, 1);  in fq_init()
310 	fq->perturbation = prandom_u32();  in fq_init()
311 	fq->quantum = 300;  in fq_init()
312 	fq->limit = 8192;  in fq_init()
313 	fq->memory_limit = 16 << 20; /* 16 MBytes */  in fq_init()
315 	fq->flows = kcalloc(fq->flows_cnt, sizeof(fq->flows[0]), GFP_KERNEL);  in fq_init()
316 	if (!fq->flows)  in fq_init()
319 	for (i = 0; i < fq->flows_cnt; i++)  in fq_init()
320 		fq_flow_init(&fq->flows[i]);  in fq_init()
325 static void fq_reset(struct fq *fq,  in fq_reset()  argument
330 	for (i = 0; i < fq->flows_cnt; i++)  in fq_reset()
331 		fq_flow_reset(fq, &fq->flows[i], free_func);  in fq_reset()
333 	kfree(fq->flows);  in fq_reset()
334 	fq->flows = NULL;  in fq_reset()