3  * Copyright (c) 2002-2005, K A Fraser
36 static bool xenvif_rx_ring_slots_available(struct xenvif_queue *queue)  in xenvif_rx_ring_slots_available()  argument
43 	spin_lock_irqsave(&queue->rx_queue.lock, flags);  in xenvif_rx_ring_slots_available()
45 	skb = skb_peek(&queue->rx_queue);  in xenvif_rx_ring_slots_available()
47 		spin_unlock_irqrestore(&queue->rx_queue.lock, flags);  in xenvif_rx_ring_slots_available()
51 	needed = DIV_ROUND_UP(skb->len, XEN_PAGE_SIZE);  in xenvif_rx_ring_slots_available()
54 	if (skb->sw_hash)  in xenvif_rx_ring_slots_available()
57 	spin_unlock_irqrestore(&queue->rx_queue.lock, flags);  in xenvif_rx_ring_slots_available()
60 		prod = queue->rx.sring->req_prod;  in xenvif_rx_ring_slots_available()
61 		cons = queue->rx.req_cons;  in xenvif_rx_ring_slots_available()
63 		if (prod - cons >= needed)  in xenvif_rx_ring_slots_available()
66 		queue->rx.sring->req_event = prod + 1;  in xenvif_rx_ring_slots_available()
72 	} while (queue->rx.sring->req_prod != prod);  in xenvif_rx_ring_slots_available()
77 void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb)  in xenvif_rx_queue_tail()  argument
81 	spin_lock_irqsave(&queue->rx_queue.lock, flags);  in xenvif_rx_queue_tail()
83 	__skb_queue_tail(&queue->rx_queue, skb);  in xenvif_rx_queue_tail()
85 	queue->rx_queue_len += skb->len;  in xenvif_rx_queue_tail()
86 	if (queue->rx_queue_len > queue->rx_queue_max) {  in xenvif_rx_queue_tail()
87 		struct net_device *dev = queue->vif->dev;  in xenvif_rx_queue_tail()
89 		netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));  in xenvif_rx_queue_tail()
92 	spin_unlock_irqrestore(&queue->rx_queue.lock, flags);  in xenvif_rx_queue_tail()
95 static struct sk_buff *xenvif_rx_dequeue(struct xenvif_queue *queue)  in xenvif_rx_dequeue()  argument
99 	spin_lock_irq(&queue->rx_queue.lock);  in xenvif_rx_dequeue()
101 	skb = __skb_dequeue(&queue->rx_queue);  in xenvif_rx_dequeue()
103 		queue->rx_queue_len -= skb->len;  in xenvif_rx_dequeue()
104 		if (queue->rx_queue_len < queue->rx_queue_max) {  in xenvif_rx_dequeue()
107 			txq = netdev_get_tx_queue(queue->vif->dev, queue->id);  in xenvif_rx_dequeue()
112 	spin_unlock_irq(&queue->rx_queue.lock);  in xenvif_rx_dequeue()
117 static void xenvif_rx_queue_purge(struct xenvif_queue *queue)  in xenvif_rx_queue_purge()  argument
121 	while ((skb = xenvif_rx_dequeue(queue)) != NULL)  in xenvif_rx_queue_purge()
125 static void xenvif_rx_queue_drop_expired(struct xenvif_queue *queue)  in xenvif_rx_queue_drop_expired()  argument
130 		skb = skb_peek(&queue->rx_queue);  in xenvif_rx_queue_drop_expired()
133 		if (time_before(jiffies, XENVIF_RX_CB(skb)->expires))  in xenvif_rx_queue_drop_expired()
135 		xenvif_rx_dequeue(queue);  in xenvif_rx_queue_drop_expired()
140 static void xenvif_rx_copy_flush(struct xenvif_queue *queue)  in xenvif_rx_copy_flush()  argument
145 	gnttab_batch_copy(queue->rx_copy.op, queue->rx_copy.num);  in xenvif_rx_copy_flush()
147 	for (i = 0; i < queue->rx_copy.num; i++) {  in xenvif_rx_copy_flush()
150 		op = &queue->rx_copy.op[i];  in xenvif_rx_copy_flush()
155 		if (unlikely(op->status != GNTST_okay)) {  in xenvif_rx_copy_flush()
158 			rsp = RING_GET_RESPONSE(&queue->rx,  in xenvif_rx_copy_flush()
159 						queue->rx_copy.idx[i]);  in xenvif_rx_copy_flush()
160 			rsp->status = op->status;  in xenvif_rx_copy_flush()
164 	queue->rx_copy.num = 0;  in xenvif_rx_copy_flush()
167 	RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&queue->rx, notify);  in xenvif_rx_copy_flush()
169 		notify_remote_via_irq(queue->rx_irq);  in xenvif_rx_copy_flush()
171 	__skb_queue_purge(queue->rx_copy.completed);  in xenvif_rx_copy_flush()
174 static void xenvif_rx_copy_add(struct xenvif_queue *queue,  in xenvif_rx_copy_add()  argument
182 	if (queue->rx_copy.num == COPY_BATCH_SIZE)  in xenvif_rx_copy_add()
183 		xenvif_rx_copy_flush(queue);  in xenvif_rx_copy_add()
185 	op = &queue->rx_copy.op[queue->rx_copy.num];  in xenvif_rx_copy_add()
189 	op->flags = GNTCOPY_dest_gref;  in xenvif_rx_copy_add()
193 		op->source.domid = foreign->domid;  in xenvif_rx_copy_add()
194 		op->source.u.ref = foreign->gref;  in xenvif_rx_copy_add()
195 		op->flags |= GNTCOPY_source_gref;  in xenvif_rx_copy_add()
197 		op->source.u.gmfn = virt_to_gfn(data);  in xenvif_rx_copy_add()
198 		op->source.domid  = DOMID_SELF;  in xenvif_rx_copy_add()
201 	op->source.offset = xen_offset_in_page(data);  in xenvif_rx_copy_add()
202 	op->dest.u.ref    = req->gref;  in xenvif_rx_copy_add()
203 	op->dest.domid    = queue->vif->domid;  in xenvif_rx_copy_add()
204 	op->dest.offset   = offset;  in xenvif_rx_copy_add()
205 	op->len           = len;  in xenvif_rx_copy_add()
207 	queue->rx_copy.idx[queue->rx_copy.num] = queue->rx.req_cons;  in xenvif_rx_copy_add()
208 	queue->rx_copy.num++;  in xenvif_rx_copy_add()
214 		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)  in xenvif_gso_type()
226 	int frag; /* frag == -1 => frag_iter->head */
228 	struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1];
233 static void xenvif_rx_next_skb(struct xenvif_queue *queue,  in xenvif_rx_next_skb()  argument
239 	skb = xenvif_rx_dequeue(queue);  in xenvif_rx_next_skb()
241 	queue->stats.tx_bytes += skb->len;  in xenvif_rx_next_skb()
242 	queue->stats.tx_packets++;  in xenvif_rx_next_skb()
247 	pkt->skb = skb;  in xenvif_rx_next_skb()
248 	pkt->frag_iter = skb;  in xenvif_rx_next_skb()
249 	pkt->remaining_len = skb->len;  in xenvif_rx_next_skb()
250 	pkt->frag = -1;  in xenvif_rx_next_skb()
253 	if ((1 << gso_type) & queue->vif->gso_mask) {  in xenvif_rx_next_skb()
256 		extra = &pkt->extras[XEN_NETIF_EXTRA_TYPE_GSO - 1];  in xenvif_rx_next_skb()
258 		extra->u.gso.type = gso_type;  in xenvif_rx_next_skb()
259 		extra->u.gso.size = skb_shinfo(skb)->gso_size;  in xenvif_rx_next_skb()
260 		extra->u.gso.pad = 0;  in xenvif_rx_next_skb()
261 		extra->u.gso.features = 0;  in xenvif_rx_next_skb()
262 		extra->type = XEN_NETIF_EXTRA_TYPE_GSO;  in xenvif_rx_next_skb()
263 		extra->flags = 0;  in xenvif_rx_next_skb()
265 		pkt->extra_count++;  in xenvif_rx_next_skb()
268 	if (queue->vif->xdp_headroom) {  in xenvif_rx_next_skb()
271 		extra = &pkt->extras[XEN_NETIF_EXTRA_TYPE_XDP - 1];  in xenvif_rx_next_skb()
274 		extra->u.xdp.headroom = queue->vif->xdp_headroom;  in xenvif_rx_next_skb()
275 		extra->type = XEN_NETIF_EXTRA_TYPE_XDP;  in xenvif_rx_next_skb()
276 		extra->flags = 0;  in xenvif_rx_next_skb()
278 		pkt->extra_count++;  in xenvif_rx_next_skb()
281 	if (skb->sw_hash) {  in xenvif_rx_next_skb()
284 		extra = &pkt->extras[XEN_NETIF_EXTRA_TYPE_HASH - 1];  in xenvif_rx_next_skb()
286 		extra->u.hash.algorithm =  in xenvif_rx_next_skb()
289 		if (skb->l4_hash)  in xenvif_rx_next_skb()
290 			extra->u.hash.type =  in xenvif_rx_next_skb()
291 				skb->protocol == htons(ETH_P_IP) ?  in xenvif_rx_next_skb()
295 			extra->u.hash.type =  in xenvif_rx_next_skb()
296 				skb->protocol == htons(ETH_P_IP) ?  in xenvif_rx_next_skb()
300 		*(uint32_t *)extra->u.hash.value = skb_get_hash_raw(skb);  in xenvif_rx_next_skb()
302 		extra->type = XEN_NETIF_EXTRA_TYPE_HASH;  in xenvif_rx_next_skb()
303 		extra->flags = 0;  in xenvif_rx_next_skb()
305 		pkt->extra_count++;  in xenvif_rx_next_skb()
309 static void xenvif_rx_complete(struct xenvif_queue *queue,  in xenvif_rx_complete()  argument
313 	queue->rx.rsp_prod_pvt = queue->rx.req_cons;  in xenvif_rx_complete()
315 	__skb_queue_tail(queue->rx_copy.completed, pkt->skb);  in xenvif_rx_complete()
320 	struct sk_buff *frag_iter = pkt->frag_iter;  in xenvif_rx_next_frag()
321 	unsigned int nr_frags = skb_shinfo(frag_iter)->nr_frags;  in xenvif_rx_next_frag()
323 	pkt->frag++;  in xenvif_rx_next_frag()
324 	pkt->frag_offset = 0;  in xenvif_rx_next_frag()
326 	if (pkt->frag >= nr_frags) {  in xenvif_rx_next_frag()
327 		if (frag_iter == pkt->skb)  in xenvif_rx_next_frag()
328 			pkt->frag_iter = skb_shinfo(frag_iter)->frag_list;  in xenvif_rx_next_frag()
330 			pkt->frag_iter = frag_iter->next;  in xenvif_rx_next_frag()
332 		pkt->frag = -1;  in xenvif_rx_next_frag()
336 static void xenvif_rx_next_chunk(struct xenvif_queue *queue,  in xenvif_rx_next_chunk()  argument
341 	struct sk_buff *frag_iter = pkt->frag_iter;  in xenvif_rx_next_chunk()
347 	if (pkt->frag == -1) {  in xenvif_rx_next_chunk()
348 		frag_data = frag_iter->data;  in xenvif_rx_next_chunk()
351 		skb_frag_t *frag = &skb_shinfo(frag_iter)->frags[pkt->frag];  in xenvif_rx_next_chunk()
357 	frag_data += pkt->frag_offset;  in xenvif_rx_next_chunk()
358 	frag_len -= pkt->frag_offset;  in xenvif_rx_next_chunk()
360 	chunk_len = min_t(size_t, frag_len, XEN_PAGE_SIZE - offset);  in xenvif_rx_next_chunk()
361 	chunk_len = min_t(size_t, chunk_len, XEN_PAGE_SIZE -  in xenvif_rx_next_chunk()
364 	pkt->frag_offset += chunk_len;  in xenvif_rx_next_chunk()
374 static void xenvif_rx_data_slot(struct xenvif_queue *queue,  in xenvif_rx_data_slot()  argument
379 	unsigned int offset = queue->vif->xdp_headroom;  in xenvif_rx_data_slot()
386 		xenvif_rx_next_chunk(queue, pkt, offset, &data, &len);  in xenvif_rx_data_slot()
387 		xenvif_rx_copy_add(queue, req, offset, data, len);  in xenvif_rx_data_slot()
390 		pkt->remaining_len -= len;  in xenvif_rx_data_slot()
392 	} while (offset < XEN_PAGE_SIZE && pkt->remaining_len > 0);  in xenvif_rx_data_slot()
394 	if (pkt->remaining_len > 0)  in xenvif_rx_data_slot()
399 	if (pkt->slot == 0) {  in xenvif_rx_data_slot()
400 		struct sk_buff *skb = pkt->skb;  in xenvif_rx_data_slot()
402 		if (skb->ip_summed == CHECKSUM_PARTIAL)  in xenvif_rx_data_slot()
405 		else if (skb->ip_summed == CHECKSUM_UNNECESSARY)  in xenvif_rx_data_slot()
408 		if (pkt->extra_count != 0)  in xenvif_rx_data_slot()
412 	rsp->offset = 0;  in xenvif_rx_data_slot()
413 	rsp->flags = flags;  in xenvif_rx_data_slot()
414 	rsp->id = req->id;  in xenvif_rx_data_slot()
415 	rsp->status = (s16)offset;  in xenvif_rx_data_slot()
418 static void xenvif_rx_extra_slot(struct xenvif_queue *queue,  in xenvif_rx_extra_slot()  argument
426 	pkt->extra_count--;  in xenvif_rx_extra_slot()
428 	for (i = 0; i < ARRAY_SIZE(pkt->extras); i++) {  in xenvif_rx_extra_slot()
429 		if (pkt->extras[i].type) {  in xenvif_rx_extra_slot()
430 			*extra = pkt->extras[i];  in xenvif_rx_extra_slot()
432 			if (pkt->extra_count != 0)  in xenvif_rx_extra_slot()
433 				extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE;  in xenvif_rx_extra_slot()
435 			pkt->extras[i].type = 0;  in xenvif_rx_extra_slot()
442 static void xenvif_rx_skb(struct xenvif_queue *queue)  in xenvif_rx_skb()  argument
446 	xenvif_rx_next_skb(queue, &pkt);  in xenvif_rx_skb()
448 	queue->last_rx_time = jiffies;  in xenvif_rx_skb()
454 		req = RING_GET_REQUEST(&queue->rx, queue->rx.req_cons);  in xenvif_rx_skb()
455 		rsp = RING_GET_RESPONSE(&queue->rx, queue->rx.req_cons);  in xenvif_rx_skb()
459 			xenvif_rx_extra_slot(queue, &pkt, req, rsp);  in xenvif_rx_skb()
461 			xenvif_rx_data_slot(queue, &pkt, req, rsp);  in xenvif_rx_skb()
463 		queue->rx.req_cons++;  in xenvif_rx_skb()
467 	xenvif_rx_complete(queue, &pkt);  in xenvif_rx_skb()
472 void xenvif_rx_action(struct xenvif_queue *queue)  in xenvif_rx_action()  argument
478 	queue->rx_copy.completed = &completed_skbs;  in xenvif_rx_action()
480 	while (xenvif_rx_ring_slots_available(queue) &&  in xenvif_rx_action()
482 		xenvif_rx_skb(queue);  in xenvif_rx_action()
487 	xenvif_rx_copy_flush(queue);  in xenvif_rx_action()
490 static bool xenvif_rx_queue_stalled(struct xenvif_queue *queue)  in xenvif_rx_queue_stalled()  argument
494 	prod = queue->rx.sring->req_prod;  in xenvif_rx_queue_stalled()
495 	cons = queue->rx.req_cons;  in xenvif_rx_queue_stalled()
497 	return !queue->stalled &&  in xenvif_rx_queue_stalled()
498 		prod - cons < 1 &&  in xenvif_rx_queue_stalled()
500 			   queue->last_rx_time + queue->vif->stall_timeout);  in xenvif_rx_queue_stalled()
503 static bool xenvif_rx_queue_ready(struct xenvif_queue *queue)  in xenvif_rx_queue_ready()  argument
507 	prod = queue->rx.sring->req_prod;  in xenvif_rx_queue_ready()
508 	cons = queue->rx.req_cons;  in xenvif_rx_queue_ready()
510 	return queue->stalled && prod - cons >= 1;  in xenvif_rx_queue_ready()
513 bool xenvif_have_rx_work(struct xenvif_queue *queue, bool test_kthread)  in xenvif_have_rx_work()  argument
515 	return xenvif_rx_ring_slots_available(queue) ||  in xenvif_have_rx_work()
516 		(queue->vif->stall_timeout &&  in xenvif_have_rx_work()
517 		 (xenvif_rx_queue_stalled(queue) ||  in xenvif_have_rx_work()
518 		  xenvif_rx_queue_ready(queue))) ||  in xenvif_have_rx_work()
520 		queue->vif->disabled;  in xenvif_have_rx_work()
523 static long xenvif_rx_queue_timeout(struct xenvif_queue *queue)  in xenvif_rx_queue_timeout()  argument
528 	skb = skb_peek(&queue->rx_queue);  in xenvif_rx_queue_timeout()
532 	timeout = XENVIF_RX_CB(skb)->expires - jiffies;  in xenvif_rx_queue_timeout()
536 /* Wait until the guest Rx thread has work.
539  * queue (and not just the head at the beginning).  In particular, if
540  * the queue is initially empty an infinite timeout is used and this
546 static void xenvif_wait_for_rx_work(struct xenvif_queue *queue)  in xenvif_wait_for_rx_work()  argument
550 	if (xenvif_have_rx_work(queue, true))  in xenvif_wait_for_rx_work()
556 		prepare_to_wait(&queue->wq, &wait, TASK_INTERRUPTIBLE);  in xenvif_wait_for_rx_work()
557 		if (xenvif_have_rx_work(queue, true))  in xenvif_wait_for_rx_work()
560 					&queue->eoi_pending) &  in xenvif_wait_for_rx_work()
562 			xen_irq_lateeoi(queue->rx_irq, 0);  in xenvif_wait_for_rx_work()
564 		ret = schedule_timeout(xenvif_rx_queue_timeout(queue));  in xenvif_wait_for_rx_work()
568 	finish_wait(&queue->wq, &wait);  in xenvif_wait_for_rx_work()
571 static void xenvif_queue_carrier_off(struct xenvif_queue *queue)  in xenvif_queue_carrier_off()  argument
573 	struct xenvif *vif = queue->vif;  in xenvif_queue_carrier_off()
575 	queue->stalled = true;  in xenvif_queue_carrier_off()
577 	/* At least one queue has stalled? Disable the carrier. */  in xenvif_queue_carrier_off()
578 	spin_lock(&vif->lock);  in xenvif_queue_carrier_off()
579 	if (vif->stalled_queues++ == 0) {  in xenvif_queue_carrier_off()
580 		netdev_info(vif->dev, "Guest Rx stalled");  in xenvif_queue_carrier_off()
581 		netif_carrier_off(vif->dev);  in xenvif_queue_carrier_off()
583 	spin_unlock(&vif->lock);  in xenvif_queue_carrier_off()
586 static void xenvif_queue_carrier_on(struct xenvif_queue *queue)  in xenvif_queue_carrier_on()  argument
588 	struct xenvif *vif = queue->vif;  in xenvif_queue_carrier_on()
590 	queue->last_rx_time = jiffies; /* Reset Rx stall detection. */  in xenvif_queue_carrier_on()
591 	queue->stalled = false;  in xenvif_queue_carrier_on()
594 	spin_lock(&vif->lock);  in xenvif_queue_carrier_on()
595 	if (--vif->stalled_queues == 0) {  in xenvif_queue_carrier_on()
596 		netdev_info(vif->dev, "Guest Rx ready");  in xenvif_queue_carrier_on()
597 		netif_carrier_on(vif->dev);  in xenvif_queue_carrier_on()
599 	spin_unlock(&vif->lock);  in xenvif_queue_carrier_on()
604 	struct xenvif_queue *queue = data;  in xenvif_kthread_guest_rx()  local
605 	struct xenvif *vif = queue->vif;  in xenvif_kthread_guest_rx()
607 	if (!vif->stall_timeout)  in xenvif_kthread_guest_rx()
608 		xenvif_queue_carrier_on(queue);  in xenvif_kthread_guest_rx()
611 		xenvif_wait_for_rx_work(queue);  in xenvif_kthread_guest_rx()
621 		 * associated with queue 0.  in xenvif_kthread_guest_rx()
623 		if (unlikely(vif->disabled && queue->id == 0)) {  in xenvif_kthread_guest_rx()
628 		if (!skb_queue_empty(&queue->rx_queue))  in xenvif_kthread_guest_rx()
629 			xenvif_rx_action(queue);  in xenvif_kthread_guest_rx()
631 		/* If the guest hasn't provided any Rx slots for a  in xenvif_kthread_guest_rx()
635 		if (vif->stall_timeout) {  in xenvif_kthread_guest_rx()
636 			if (xenvif_rx_queue_stalled(queue))  in xenvif_kthread_guest_rx()
637 				xenvif_queue_carrier_off(queue);  in xenvif_kthread_guest_rx()
638 			else if (xenvif_rx_queue_ready(queue))  in xenvif_kthread_guest_rx()
639 				xenvif_queue_carrier_on(queue);  in xenvif_kthread_guest_rx()
647 		xenvif_rx_queue_drop_expired(queue);  in xenvif_kthread_guest_rx()
653 	xenvif_rx_queue_purge(queue);  in xenvif_kthread_guest_rx()