106 static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx,
109 static void make_tx_response(struct xenvif_queue *queue,
113 static void push_tx_responses(struct xenvif_queue *queue);
115 static void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx);
117 static inline int tx_work_todo(struct xenvif_queue *queue);
119 static inline unsigned long idx_to_pfn(struct xenvif_queue *queue,  in idx_to_pfn()  argument
122 	return page_to_pfn(queue->mmap_pages[idx]);  in idx_to_pfn()
125 static inline unsigned long idx_to_kaddr(struct xenvif_queue *queue,  in idx_to_kaddr()  argument
128 	return (unsigned long)pfn_to_kaddr(idx_to_pfn(queue, idx));  in idx_to_kaddr()
161 void xenvif_kick_thread(struct xenvif_queue *queue)  in xenvif_kick_thread()  argument
163 	wake_up(&queue->wq);  in xenvif_kick_thread()
166 void xenvif_napi_schedule_or_enable_events(struct xenvif_queue *queue)  in xenvif_napi_schedule_or_enable_events()  argument
170 	RING_FINAL_CHECK_FOR_REQUESTS(&queue->tx, more_to_do);  in xenvif_napi_schedule_or_enable_events()
173 		napi_schedule(&queue->napi);  in xenvif_napi_schedule_or_enable_events()
175 				     &queue->eoi_pending) &  in xenvif_napi_schedule_or_enable_events()
177 		xen_irq_lateeoi(queue->tx_irq, 0);  in xenvif_napi_schedule_or_enable_events()
180 static void tx_add_credit(struct xenvif_queue *queue)  in tx_add_credit()  argument
188 	max_burst = max(131072UL, queue->credit_bytes);  in tx_add_credit()
191 	max_credit = queue->remaining_credit + queue->credit_bytes;  in tx_add_credit()
192 	if (max_credit < queue->remaining_credit)  in tx_add_credit()
195 	queue->remaining_credit = min(max_credit, max_burst);  in tx_add_credit()
196 	queue->rate_limited = false;  in tx_add_credit()
201 	struct xenvif_queue *queue = from_timer(queue, t, credit_timeout);  in xenvif_tx_credit_callback()  local
202 	tx_add_credit(queue);  in xenvif_tx_credit_callback()
203 	xenvif_napi_schedule_or_enable_events(queue);  in xenvif_tx_credit_callback()
206 static void xenvif_tx_err(struct xenvif_queue *queue,  in xenvif_tx_err()  argument
210 	RING_IDX cons = queue->tx.req_cons;  in xenvif_tx_err()
214 		spin_lock_irqsave(&queue->response_lock, flags);  in xenvif_tx_err()
215 		make_tx_response(queue, txp, extra_count, XEN_NETIF_RSP_ERROR);  in xenvif_tx_err()
216 		push_tx_responses(queue);  in xenvif_tx_err()
217 		spin_unlock_irqrestore(&queue->response_lock, flags);  in xenvif_tx_err()
220 		RING_COPY_REQUEST(&queue->tx, cons++, txp);  in xenvif_tx_err()
223 	queue->tx.req_cons = cons;  in xenvif_tx_err()
235 static int xenvif_count_requests(struct xenvif_queue *queue,  in xenvif_count_requests()  argument
241 	RING_IDX cons = queue->tx.req_cons;  in xenvif_count_requests()
253 			netdev_err(queue->vif->dev,  in xenvif_count_requests()
256 			xenvif_fatal_tx_err(queue->vif);  in xenvif_count_requests()
264 			netdev_err(queue->vif->dev,  in xenvif_count_requests()
267 			xenvif_fatal_tx_err(queue->vif);  in xenvif_count_requests()
280 				netdev_dbg(queue->vif->dev,  in xenvif_count_requests()
289 		RING_COPY_REQUEST(&queue->tx, cons + slots, txp);  in xenvif_count_requests()
302 				netdev_dbg(queue->vif->dev,  in xenvif_count_requests()
312 			netdev_err(queue->vif->dev, "Cross page boundary, txp->offset: %u, size: %u\n",  in xenvif_count_requests()
314 			xenvif_fatal_tx_err(queue->vif);  in xenvif_count_requests()
326 		xenvif_tx_err(queue, first, extra_count, cons + slots);  in xenvif_count_requests()
343 static inline void xenvif_tx_create_map_op(struct xenvif_queue *queue,  in xenvif_tx_create_map_op()  argument
349 	queue->pages_to_map[mop-queue->tx_map_ops] = queue->mmap_pages[pending_idx];  in xenvif_tx_create_map_op()
350 	gnttab_set_map_op(mop, idx_to_kaddr(queue, pending_idx),  in xenvif_tx_create_map_op()
352 			  txp->gref, queue->vif->domid);  in xenvif_tx_create_map_op()
354 	memcpy(&queue->pending_tx_info[pending_idx].req, txp,  in xenvif_tx_create_map_op()
356 	queue->pending_tx_info[pending_idx].extra_count = extra_count;  in xenvif_tx_create_map_op()
376 static void xenvif_get_requests(struct xenvif_queue *queue,  in xenvif_get_requests()  argument
392 	struct gnttab_copy *cop = queue->tx_copy_ops + *copy_ops;  in xenvif_get_requests()
393 	struct gnttab_map_grant_ref *gop = queue->tx_map_ops + *map_ops;  in xenvif_get_requests()
406 		cop->source.domid = queue->vif->domid;  in xenvif_get_requests()
419 		index = pending_index(queue->pending_cons);  in xenvif_get_requests()
420 		pending_idx = queue->pending_ring[index];  in xenvif_get_requests()
421 		callback_param(queue, pending_idx).ctx = NULL;  in xenvif_get_requests()
431 			memcpy(&queue->pending_tx_info[pending_idx].req,  in xenvif_get_requests()
433 			queue->pending_tx_info[pending_idx].extra_count =  in xenvif_get_requests()
440 			queue->pending_cons++;  in xenvif_get_requests()
453 		index = pending_index(queue->pending_cons++);  in xenvif_get_requests()
454 		pending_idx = queue->pending_ring[index];  in xenvif_get_requests()
455 		xenvif_tx_create_map_op(queue, pending_idx, txp,  in xenvif_get_requests()
472 			index = pending_index(queue->pending_cons++);  in xenvif_get_requests()
473 			pending_idx = queue->pending_ring[index];  in xenvif_get_requests()
474 			xenvif_tx_create_map_op(queue, pending_idx, txp, 0,  in xenvif_get_requests()
483 	(*copy_ops) = cop - queue->tx_copy_ops;  in xenvif_get_requests()
484 	(*map_ops) = gop - queue->tx_map_ops;  in xenvif_get_requests()
487 static inline void xenvif_grant_handle_set(struct xenvif_queue *queue,  in xenvif_grant_handle_set()  argument
491 	if (unlikely(queue->grant_tx_handle[pending_idx] !=  in xenvif_grant_handle_set()
493 		netdev_err(queue->vif->dev,  in xenvif_grant_handle_set()
498 	queue->grant_tx_handle[pending_idx] = handle;  in xenvif_grant_handle_set()
501 static inline void xenvif_grant_handle_reset(struct xenvif_queue *queue,  in xenvif_grant_handle_reset()  argument
504 	if (unlikely(queue->grant_tx_handle[pending_idx] ==  in xenvif_grant_handle_reset()
506 		netdev_err(queue->vif->dev,  in xenvif_grant_handle_reset()
511 	queue->grant_tx_handle[pending_idx] = NETBACK_INVALID_HANDLE;  in xenvif_grant_handle_reset()
514 static int xenvif_tx_check_gop(struct xenvif_queue *queue,  in xenvif_tx_check_gop()  argument
545 				xenvif_idx_release(queue, pending_idx,  in xenvif_tx_check_gop()
550 				netdev_dbg(queue->vif->dev,  in xenvif_tx_check_gop()
557 				xenvif_idx_release(queue, pending_idx,  in xenvif_tx_check_gop()
573 			xenvif_grant_handle_set(queue,  in xenvif_tx_check_gop()
578 				xenvif_idx_unmap(queue, pending_idx);  in xenvif_tx_check_gop()
584 					xenvif_idx_release(queue, pending_idx,  in xenvif_tx_check_gop()
587 					xenvif_idx_release(queue, pending_idx,  in xenvif_tx_check_gop()
595 			netdev_dbg(queue->vif->dev,  in xenvif_tx_check_gop()
602 		xenvif_idx_release(queue, pending_idx, XEN_NETIF_RSP_ERROR);  in xenvif_tx_check_gop()
611 			xenvif_idx_unmap(queue, pending_idx);  in xenvif_tx_check_gop()
612 			xenvif_idx_release(queue, pending_idx,  in xenvif_tx_check_gop()
622 				xenvif_idx_unmap(queue, pending_idx);  in xenvif_tx_check_gop()
623 				xenvif_idx_release(queue, pending_idx,  in xenvif_tx_check_gop()
644 static void xenvif_fill_frags(struct xenvif_queue *queue, struct sk_buff *skb)  in xenvif_fill_frags()  argument
662 				&callback_param(queue, pending_idx);  in xenvif_fill_frags()
664 			callback_param(queue, prev_pending_idx).ctx =  in xenvif_fill_frags()
665 				&callback_param(queue, pending_idx);  in xenvif_fill_frags()
667 		callback_param(queue, pending_idx).ctx = NULL;  in xenvif_fill_frags()
670 		txp = &queue->pending_tx_info[pending_idx].req;  in xenvif_fill_frags()
671 		page = virt_to_page(idx_to_kaddr(queue, pending_idx));  in xenvif_fill_frags()
678 		get_page(queue->mmap_pages[pending_idx]);  in xenvif_fill_frags()
682 static int xenvif_get_extras(struct xenvif_queue *queue,  in xenvif_get_extras()  argument
688 	RING_IDX cons = queue->tx.req_cons;  in xenvif_get_extras()
692 			netdev_err(queue->vif->dev, "Missing extra info\n");  in xenvif_get_extras()
693 			xenvif_fatal_tx_err(queue->vif);  in xenvif_get_extras()
697 		RING_COPY_REQUEST(&queue->tx, cons, &extra);  in xenvif_get_extras()
699 		queue->tx.req_cons = ++cons;  in xenvif_get_extras()
704 			netdev_err(queue->vif->dev,  in xenvif_get_extras()
706 			xenvif_fatal_tx_err(queue->vif);  in xenvif_get_extras()
745 static int checksum_setup(struct xenvif_queue *queue, struct sk_buff *skb)  in checksum_setup()  argument
755 		queue->stats.rx_gso_checksum_fixup++;  in checksum_setup()
767 static bool tx_credit_exceeded(struct xenvif_queue *queue, unsigned size)  in tx_credit_exceeded()  argument
770 	u64 next_credit = queue->credit_window_start +  in tx_credit_exceeded()
771 		msecs_to_jiffies(queue->credit_usec / 1000);  in tx_credit_exceeded()
774 	if (timer_pending(&queue->credit_timeout)) {  in tx_credit_exceeded()
775 		queue->rate_limited = true;  in tx_credit_exceeded()
781 		queue->credit_window_start = now;  in tx_credit_exceeded()
782 		tx_add_credit(queue);  in tx_credit_exceeded()
786 	if (size > queue->remaining_credit) {  in tx_credit_exceeded()
787 		mod_timer(&queue->credit_timeout,  in tx_credit_exceeded()
789 		queue->credit_window_start = next_credit;  in tx_credit_exceeded()
790 		queue->rate_limited = true;  in tx_credit_exceeded()
872 static void xenvif_tx_build_gops(struct xenvif_queue *queue,  in xenvif_tx_build_gops()  argument
881 	while (skb_queue_len(&queue->tx_queue) < budget) {  in xenvif_tx_build_gops()
892 		if (queue->tx.sring->req_prod - queue->tx.req_cons >  in xenvif_tx_build_gops()
894 			netdev_err(queue->vif->dev,  in xenvif_tx_build_gops()
897 				   queue->tx.sring->req_prod, queue->tx.req_cons,  in xenvif_tx_build_gops()
899 			xenvif_fatal_tx_err(queue->vif);  in xenvif_tx_build_gops()
903 		work_to_do = XEN_RING_NR_UNCONSUMED_REQUESTS(&queue->tx);  in xenvif_tx_build_gops()
907 		idx = queue->tx.req_cons;  in xenvif_tx_build_gops()
909 		RING_COPY_REQUEST(&queue->tx, idx, &txreq);  in xenvif_tx_build_gops()
912 		if (txreq.size > queue->remaining_credit &&  in xenvif_tx_build_gops()
913 		    tx_credit_exceeded(queue, txreq.size))  in xenvif_tx_build_gops()
916 		queue->remaining_credit -= txreq.size;  in xenvif_tx_build_gops()
919 		queue->tx.req_cons = ++idx;  in xenvif_tx_build_gops()
924 			work_to_do = xenvif_get_extras(queue, extras,  in xenvif_tx_build_gops()
927 			idx = queue->tx.req_cons;  in xenvif_tx_build_gops()
936 			ret = xenvif_mcast_add(queue->vif, extra->u.mcast.addr);  in xenvif_tx_build_gops()
938 			make_tx_response(queue, &txreq, extra_count,  in xenvif_tx_build_gops()
942 			push_tx_responses(queue);  in xenvif_tx_build_gops()
950 			xenvif_mcast_del(queue->vif, extra->u.mcast.addr);  in xenvif_tx_build_gops()
952 			make_tx_response(queue, &txreq, extra_count,  in xenvif_tx_build_gops()
954 			push_tx_responses(queue);  in xenvif_tx_build_gops()
961 		ret = xenvif_count_requests(queue, &txreq, extra_count,  in xenvif_tx_build_gops()
970 			netdev_dbg(queue->vif->dev,  in xenvif_tx_build_gops()
972 			xenvif_tx_err(queue, &txreq, extra_count, idx);  in xenvif_tx_build_gops()
978 			netdev_err(queue->vif->dev,  in xenvif_tx_build_gops()
982 			xenvif_fatal_tx_err(queue->vif);  in xenvif_tx_build_gops()
986 		index = pending_index(queue->pending_cons);  in xenvif_tx_build_gops()
987 		pending_idx = queue->pending_ring[index];  in xenvif_tx_build_gops()
994 			netdev_dbg(queue->vif->dev,  in xenvif_tx_build_gops()
996 			xenvif_tx_err(queue, &txreq, extra_count, idx);  in xenvif_tx_build_gops()
1014 				xenvif_tx_err(queue, &txreq, extra_count, idx);  in xenvif_tx_build_gops()
1016 					netdev_err(queue->vif->dev,  in xenvif_tx_build_gops()
1026 			if (xenvif_set_skb_gso(queue->vif, skb, gso)) {  in xenvif_tx_build_gops()
1062 		xenvif_get_requests(queue, skb, &txreq, txfrags, copy_ops,  in xenvif_tx_build_gops()
1066 		__skb_queue_tail(&queue->tx_queue, skb);  in xenvif_tx_build_gops()
1068 		queue->tx.req_cons = idx;  in xenvif_tx_build_gops()
1070 		if ((*map_ops >= ARRAY_SIZE(queue->tx_map_ops)) ||  in xenvif_tx_build_gops()
1071 		    (*copy_ops >= ARRAY_SIZE(queue->tx_copy_ops)))  in xenvif_tx_build_gops()
1081 static int xenvif_handle_frag_list(struct xenvif_queue *queue, struct sk_buff *skb)  in xenvif_handle_frag_list()  argument
1089 	queue->stats.tx_zerocopy_sent += 2;  in xenvif_handle_frag_list()
1090 	queue->stats.tx_frag_overflow++;  in xenvif_handle_frag_list()
1092 	xenvif_fill_frags(queue, nskb);  in xenvif_handle_frag_list()
1131 	atomic_inc(&queue->inflight_packets);  in xenvif_handle_frag_list()
1143 static int xenvif_tx_submit(struct xenvif_queue *queue)  in xenvif_tx_submit()  argument
1145 	struct gnttab_map_grant_ref *gop_map = queue->tx_map_ops;  in xenvif_tx_submit()
1146 	struct gnttab_copy *gop_copy = queue->tx_copy_ops;  in xenvif_tx_submit()
1150 	while ((skb = __skb_dequeue(&queue->tx_queue)) != NULL) {  in xenvif_tx_submit()
1155 		txp = &queue->pending_tx_info[pending_idx].req;  in xenvif_tx_submit()
1158 		if (unlikely(xenvif_tx_check_gop(queue, skb, &gop_map, &gop_copy))) {  in xenvif_tx_submit()
1178 		xenvif_fill_frags(queue, skb);  in xenvif_tx_submit()
1182 			xenvif_skb_zerocopy_prepare(queue, nskb);  in xenvif_tx_submit()
1183 			if (xenvif_handle_frag_list(queue, skb)) {  in xenvif_tx_submit()
1185 					netdev_err(queue->vif->dev,  in xenvif_tx_submit()
1187 				xenvif_skb_zerocopy_prepare(queue, skb);  in xenvif_tx_submit()
1196 		skb->dev      = queue->vif->dev;  in xenvif_tx_submit()
1200 		if (checksum_setup(queue, skb)) {  in xenvif_tx_submit()
1201 			netdev_dbg(queue->vif->dev,  in xenvif_tx_submit()
1205 				xenvif_skb_zerocopy_prepare(queue, skb);  in xenvif_tx_submit()
1233 		queue->stats.rx_bytes += skb->len;  in xenvif_tx_submit()
1234 		queue->stats.rx_packets++;  in xenvif_tx_submit()
1244 			xenvif_skb_zerocopy_prepare(queue, skb);  in xenvif_tx_submit()
1245 			queue->stats.tx_zerocopy_sent++;  in xenvif_tx_submit()
1260 	struct xenvif_queue *queue = ubuf_to_queue(ubuf);  in xenvif_zerocopy_callback()  local
1265 	spin_lock_irqsave(&queue->callback_lock, flags);  in xenvif_zerocopy_callback()
1269 		BUG_ON(queue->dealloc_prod - queue->dealloc_cons >=  in xenvif_zerocopy_callback()
1271 		index = pending_index(queue->dealloc_prod);  in xenvif_zerocopy_callback()
1272 		queue->dealloc_ring[index] = pending_idx;  in xenvif_zerocopy_callback()
1277 		queue->dealloc_prod++;  in xenvif_zerocopy_callback()
1279 	spin_unlock_irqrestore(&queue->callback_lock, flags);  in xenvif_zerocopy_callback()
1282 		queue->stats.tx_zerocopy_success++;  in xenvif_zerocopy_callback()
1284 		queue->stats.tx_zerocopy_fail++;  in xenvif_zerocopy_callback()
1285 	xenvif_skb_zerocopy_complete(queue);  in xenvif_zerocopy_callback()
1288 static inline void xenvif_tx_dealloc_action(struct xenvif_queue *queue)  in xenvif_tx_dealloc_action()  argument
1295 	dc = queue->dealloc_cons;  in xenvif_tx_dealloc_action()
1296 	gop = queue->tx_unmap_ops;  in xenvif_tx_dealloc_action()
1300 		dp = queue->dealloc_prod;  in xenvif_tx_dealloc_action()
1308 			BUG_ON(gop - queue->tx_unmap_ops >= MAX_PENDING_REQS);  in xenvif_tx_dealloc_action()
1310 				queue->dealloc_ring[pending_index(dc++)];  in xenvif_tx_dealloc_action()
1312 			pending_idx_release[gop - queue->tx_unmap_ops] =  in xenvif_tx_dealloc_action()
1314 			queue->pages_to_unmap[gop - queue->tx_unmap_ops] =  in xenvif_tx_dealloc_action()
1315 				queue->mmap_pages[pending_idx];  in xenvif_tx_dealloc_action()
1317 					    idx_to_kaddr(queue, pending_idx),  in xenvif_tx_dealloc_action()
1319 					    queue->grant_tx_handle[pending_idx]);  in xenvif_tx_dealloc_action()
1320 			xenvif_grant_handle_reset(queue, pending_idx);  in xenvif_tx_dealloc_action()
1324 	} while (dp != queue->dealloc_prod);  in xenvif_tx_dealloc_action()
1326 	queue->dealloc_cons = dc;  in xenvif_tx_dealloc_action()
1328 	if (gop - queue->tx_unmap_ops > 0) {  in xenvif_tx_dealloc_action()
1330 		ret = gnttab_unmap_refs(queue->tx_unmap_ops,  in xenvif_tx_dealloc_action()
1332 					queue->pages_to_unmap,  in xenvif_tx_dealloc_action()
1333 					gop - queue->tx_unmap_ops);  in xenvif_tx_dealloc_action()
1335 			netdev_err(queue->vif->dev, "Unmap fail: nr_ops %tu ret %d\n",  in xenvif_tx_dealloc_action()
1336 				   gop - queue->tx_unmap_ops, ret);  in xenvif_tx_dealloc_action()
1337 			for (i = 0; i < gop - queue->tx_unmap_ops; ++i) {  in xenvif_tx_dealloc_action()
1339 					netdev_err(queue->vif->dev,  in xenvif_tx_dealloc_action()
1349 	for (i = 0; i < gop - queue->tx_unmap_ops; ++i)  in xenvif_tx_dealloc_action()
1350 		xenvif_idx_release(queue, pending_idx_release[i],  in xenvif_tx_dealloc_action()
1356 int xenvif_tx_action(struct xenvif_queue *queue, int budget)  in xenvif_tx_action()  argument
1361 	if (unlikely(!tx_work_todo(queue)))  in xenvif_tx_action()
1364 	xenvif_tx_build_gops(queue, budget, &nr_cops, &nr_mops);  in xenvif_tx_action()
1369 	gnttab_batch_copy(queue->tx_copy_ops, nr_cops);  in xenvif_tx_action()
1371 		ret = gnttab_map_refs(queue->tx_map_ops,  in xenvif_tx_action()
1373 				      queue->pages_to_map,  in xenvif_tx_action()
1378 			netdev_err(queue->vif->dev, "Map fail: nr %u ret %d\n",  in xenvif_tx_action()
1381 				WARN_ON_ONCE(queue->tx_map_ops[i].status ==  in xenvif_tx_action()
1386 	work_done = xenvif_tx_submit(queue);  in xenvif_tx_action()
1391 static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx,  in xenvif_idx_release()  argument
1398 	pending_tx_info = &queue->pending_tx_info[pending_idx];  in xenvif_idx_release()
1400 	spin_lock_irqsave(&queue->response_lock, flags);  in xenvif_idx_release()
1402 	make_tx_response(queue, &pending_tx_info->req,  in xenvif_idx_release()
1409 	index = pending_index(queue->pending_prod++);  in xenvif_idx_release()
1410 	queue->pending_ring[index] = pending_idx;  in xenvif_idx_release()
1412 	push_tx_responses(queue);  in xenvif_idx_release()
1414 	spin_unlock_irqrestore(&queue->response_lock, flags);  in xenvif_idx_release()
1418 static void make_tx_response(struct xenvif_queue *queue,  in make_tx_response()  argument
1423 	RING_IDX i = queue->tx.rsp_prod_pvt;  in make_tx_response()
1426 	resp = RING_GET_RESPONSE(&queue->tx, i);  in make_tx_response()
1431 		RING_GET_RESPONSE(&queue->tx, ++i)->status = XEN_NETIF_RSP_NULL;  in make_tx_response()
1433 	queue->tx.rsp_prod_pvt = ++i;  in make_tx_response()
1436 static void push_tx_responses(struct xenvif_queue *queue)  in push_tx_responses()  argument
1440 	RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&queue->tx, notify);  in push_tx_responses()
1442 		notify_remote_via_irq(queue->tx_irq);  in push_tx_responses()
1445 static void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx)  in xenvif_idx_unmap()  argument
1451 			    idx_to_kaddr(queue, pending_idx),  in xenvif_idx_unmap()
1453 			    queue->grant_tx_handle[pending_idx]);  in xenvif_idx_unmap()
1454 	xenvif_grant_handle_reset(queue, pending_idx);  in xenvif_idx_unmap()
1457 				&queue->mmap_pages[pending_idx], 1);  in xenvif_idx_unmap()
1459 		netdev_err(queue->vif->dev,  in xenvif_idx_unmap()
1470 static inline int tx_work_todo(struct xenvif_queue *queue)  in tx_work_todo()  argument
1472 	if (likely(RING_HAS_UNCONSUMED_REQUESTS(&queue->tx)))  in tx_work_todo()
1478 static inline bool tx_dealloc_work_todo(struct xenvif_queue *queue)  in tx_dealloc_work_todo()  argument
1480 	return queue->dealloc_cons != queue->dealloc_prod;  in tx_dealloc_work_todo()
1483 void xenvif_unmap_frontend_data_rings(struct xenvif_queue *queue)  in xenvif_unmap_frontend_data_rings()  argument
1485 	if (queue->tx.sring)  in xenvif_unmap_frontend_data_rings()
1486 		xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(queue->vif),  in xenvif_unmap_frontend_data_rings()
1487 					queue->tx.sring);  in xenvif_unmap_frontend_data_rings()
1488 	if (queue->rx.sring)  in xenvif_unmap_frontend_data_rings()
1489 		xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(queue->vif),  in xenvif_unmap_frontend_data_rings()
1490 					queue->rx.sring);  in xenvif_unmap_frontend_data_rings()
1493 int xenvif_map_frontend_data_rings(struct xenvif_queue *queue,  in xenvif_map_frontend_data_rings()  argument
1503 	err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(queue->vif),  in xenvif_map_frontend_data_rings()
1512 	BACK_RING_ATTACH(&queue->tx, txs, rsp_prod, XEN_PAGE_SIZE);  in xenvif_map_frontend_data_rings()
1515 	if (req_prod - rsp_prod > RING_SIZE(&queue->tx))  in xenvif_map_frontend_data_rings()
1518 	err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(queue->vif),  in xenvif_map_frontend_data_rings()
1527 	BACK_RING_ATTACH(&queue->rx, rxs, rsp_prod, XEN_PAGE_SIZE);  in xenvif_map_frontend_data_rings()
1530 	if (req_prod - rsp_prod > RING_SIZE(&queue->rx))  in xenvif_map_frontend_data_rings()
1536 	xenvif_unmap_frontend_data_rings(queue);  in xenvif_map_frontend_data_rings()
1540 static bool xenvif_dealloc_kthread_should_stop(struct xenvif_queue *queue)  in xenvif_dealloc_kthread_should_stop()  argument
1546 		!atomic_read(&queue->inflight_packets);  in xenvif_dealloc_kthread_should_stop()
1551 	struct xenvif_queue *queue = data;  in xenvif_dealloc_kthread()  local
1554 		wait_event_interruptible(queue->dealloc_wq,  in xenvif_dealloc_kthread()
1555 					 tx_dealloc_work_todo(queue) ||  in xenvif_dealloc_kthread()
1556 					 xenvif_dealloc_kthread_should_stop(queue));  in xenvif_dealloc_kthread()
1557 		if (xenvif_dealloc_kthread_should_stop(queue))  in xenvif_dealloc_kthread()
1560 		xenvif_tx_dealloc_action(queue);  in xenvif_dealloc_kthread()
1565 	if (tx_dealloc_work_todo(queue))  in xenvif_dealloc_kthread()
1566 		xenvif_tx_dealloc_action(queue);  in xenvif_dealloc_kthread()