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@@ -0,0 +1,789 @@
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+/*
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+ * Copyright (c) 2016 Citrix Systems Inc.
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+ * Copyright (c) 2002-2005, K A Fraser
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License version 2
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+ * as published by the Free Software Foundation; or, when distributed
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+ * separately from the Linux kernel or incorporated into other
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+ * software packages, subject to the following license:
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy
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+ * of this source file (the "Software"), to deal in the Software without
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+ * restriction, including without limitation the rights to use, copy, modify,
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+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
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+ * and to permit persons to whom the Software is furnished to do so, subject to
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+ * the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in
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+ * all copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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+ * IN THE SOFTWARE.
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+ */
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+
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+#include "common.h"
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+
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+#include <linux/kthread.h>
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+
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+#include <xen/xen.h>
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+#include <xen/events.h>
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+
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+static bool xenvif_rx_ring_slots_available(struct xenvif_queue *queue)
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+{
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+ RING_IDX prod, cons;
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+ struct sk_buff *skb;
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+ int needed;
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+
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+ skb = skb_peek(&queue->rx_queue);
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+ if (!skb)
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+ return false;
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+
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+ needed = DIV_ROUND_UP(skb->len, XEN_PAGE_SIZE);
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+ if (skb_is_gso(skb))
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+ needed++;
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+ if (skb->sw_hash)
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+ needed++;
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+
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+ do {
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+ prod = queue->rx.sring->req_prod;
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+ cons = queue->rx.req_cons;
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+
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+ if (prod - cons >= needed)
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+ return true;
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+
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+ queue->rx.sring->req_event = prod + 1;
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+
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+ /* Make sure event is visible before we check prod
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+ * again.
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+ */
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+ mb();
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+ } while (queue->rx.sring->req_prod != prod);
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+
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+ return false;
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+}
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+
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+void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb)
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+{
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&queue->rx_queue.lock, flags);
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+
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+ __skb_queue_tail(&queue->rx_queue, skb);
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+
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+ queue->rx_queue_len += skb->len;
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+ if (queue->rx_queue_len > queue->rx_queue_max) {
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+ struct net_device *dev = queue->vif->dev;
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+
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+ netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));
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+ }
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+
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+ spin_unlock_irqrestore(&queue->rx_queue.lock, flags);
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+}
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+
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+static struct sk_buff *xenvif_rx_dequeue(struct xenvif_queue *queue)
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+{
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+ struct sk_buff *skb;
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+
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+ spin_lock_irq(&queue->rx_queue.lock);
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+
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+ skb = __skb_dequeue(&queue->rx_queue);
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+ if (skb)
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+ queue->rx_queue_len -= skb->len;
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+
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+ spin_unlock_irq(&queue->rx_queue.lock);
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+
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+ return skb;
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+}
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+
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+static void xenvif_rx_queue_maybe_wake(struct xenvif_queue *queue)
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+{
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+ spin_lock_irq(&queue->rx_queue.lock);
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+
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+ if (queue->rx_queue_len < queue->rx_queue_max) {
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+ struct net_device *dev = queue->vif->dev;
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+
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+ netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id));
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+ }
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+
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+ spin_unlock_irq(&queue->rx_queue.lock);
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+}
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+
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+static void xenvif_rx_queue_purge(struct xenvif_queue *queue)
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+{
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+ struct sk_buff *skb;
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+
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+ while ((skb = xenvif_rx_dequeue(queue)) != NULL)
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+ kfree_skb(skb);
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+}
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+
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+static void xenvif_rx_queue_drop_expired(struct xenvif_queue *queue)
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+{
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+ struct sk_buff *skb;
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+
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+ for (;;) {
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+ skb = skb_peek(&queue->rx_queue);
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+ if (!skb)
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+ break;
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+ if (time_before(jiffies, XENVIF_RX_CB(skb)->expires))
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+ break;
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+ xenvif_rx_dequeue(queue);
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+ kfree_skb(skb);
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+ }
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+}
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+
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+struct netrx_pending_operations {
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+ unsigned int copy_prod, copy_cons;
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+ unsigned int meta_prod, meta_cons;
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+ struct gnttab_copy *copy;
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+ struct xenvif_rx_meta *meta;
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+ int copy_off;
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+ grant_ref_t copy_gref;
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+};
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+
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+static struct xenvif_rx_meta *get_next_rx_buffer(
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+ struct xenvif_queue *queue,
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+ struct netrx_pending_operations *npo)
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+{
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+ struct xenvif_rx_meta *meta;
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+ struct xen_netif_rx_request req;
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+
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+ RING_COPY_REQUEST(&queue->rx, queue->rx.req_cons++, &req);
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+
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+ meta = npo->meta + npo->meta_prod++;
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+ meta->gso_type = XEN_NETIF_GSO_TYPE_NONE;
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+ meta->gso_size = 0;
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+ meta->size = 0;
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+ meta->id = req.id;
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+
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+ npo->copy_off = 0;
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+ npo->copy_gref = req.gref;
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+
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+ return meta;
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+}
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+
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+struct gop_frag_copy {
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+ struct xenvif_queue *queue;
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+ struct netrx_pending_operations *npo;
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+ struct xenvif_rx_meta *meta;
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+ int head;
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+ int gso_type;
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+ int protocol;
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+ int hash_present;
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+
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+ struct page *page;
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+};
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+
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+static void xenvif_setup_copy_gop(unsigned long gfn,
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+ unsigned int offset,
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+ unsigned int *len,
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+ struct gop_frag_copy *info)
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+{
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+ struct gnttab_copy *copy_gop;
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+ struct xen_page_foreign *foreign;
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+ /* Convenient aliases */
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+ struct xenvif_queue *queue = info->queue;
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+ struct netrx_pending_operations *npo = info->npo;
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+ struct page *page = info->page;
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+
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+ WARN_ON(npo->copy_off > MAX_BUFFER_OFFSET);
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+
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+ if (npo->copy_off == MAX_BUFFER_OFFSET)
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+ info->meta = get_next_rx_buffer(queue, npo);
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+
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+ if (npo->copy_off + *len > MAX_BUFFER_OFFSET)
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+ *len = MAX_BUFFER_OFFSET - npo->copy_off;
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+
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+ copy_gop = npo->copy + npo->copy_prod++;
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+ copy_gop->flags = GNTCOPY_dest_gref;
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+ copy_gop->len = *len;
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+
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+ foreign = xen_page_foreign(page);
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+ if (foreign) {
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+ copy_gop->source.domid = foreign->domid;
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+ copy_gop->source.u.ref = foreign->gref;
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+ copy_gop->flags |= GNTCOPY_source_gref;
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+ } else {
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+ copy_gop->source.domid = DOMID_SELF;
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+ copy_gop->source.u.gmfn = gfn;
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+ }
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+ copy_gop->source.offset = offset;
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+
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+ copy_gop->dest.domid = queue->vif->domid;
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+ copy_gop->dest.offset = npo->copy_off;
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+ copy_gop->dest.u.ref = npo->copy_gref;
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+
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+ npo->copy_off += *len;
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+ info->meta->size += *len;
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+
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+ if (!info->head)
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+ return;
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+
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+ /* Leave a gap for the GSO descriptor. */
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+ if ((1 << info->gso_type) & queue->vif->gso_mask)
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+ queue->rx.req_cons++;
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+
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+ /* Leave a gap for the hash extra segment. */
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+ if (info->hash_present)
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+ queue->rx.req_cons++;
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+
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+ info->head = 0; /* There must be something in this buffer now */
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+}
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+
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+static void xenvif_gop_frag_copy_grant(unsigned long gfn,
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+ unsigned int offset,
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+ unsigned int len,
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+ void *data)
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+{
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+ unsigned int bytes;
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+
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+ while (len) {
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+ bytes = len;
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+ xenvif_setup_copy_gop(gfn, offset, &bytes, data);
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+ offset += bytes;
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+ len -= bytes;
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+ }
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+}
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+
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+/* Set up the grant operations for this fragment. If it's a flipping
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+ * interface, we also set up the unmap request from here.
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+ */
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+static void xenvif_gop_frag_copy(struct xenvif_queue *queue,
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+ struct sk_buff *skb,
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+ struct netrx_pending_operations *npo,
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+ struct page *page, unsigned long size,
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+ unsigned long offset, int *head)
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+{
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+ struct gop_frag_copy info = {
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+ .queue = queue,
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+ .npo = npo,
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+ .head = *head,
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+ .gso_type = XEN_NETIF_GSO_TYPE_NONE,
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+ /* xenvif_set_skb_hash() will have either set a s/w
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+ * hash or cleared the hash depending on
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+ * whether the the frontend wants a hash for this skb.
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+ */
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+ .hash_present = skb->sw_hash,
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+ };
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+ unsigned long bytes;
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+
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+ if (skb_is_gso(skb)) {
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+ if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
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+ info.gso_type = XEN_NETIF_GSO_TYPE_TCPV4;
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+ else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
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+ info.gso_type = XEN_NETIF_GSO_TYPE_TCPV6;
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+ }
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+
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+ /* Data must not cross a page boundary. */
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+ WARN_ON(size + offset > (PAGE_SIZE << compound_order(page)));
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+
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+ info.meta = npo->meta + npo->meta_prod - 1;
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+
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+ /* Skip unused frames from start of page */
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+ page += offset >> PAGE_SHIFT;
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+ offset &= ~PAGE_MASK;
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+
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+ while (size > 0) {
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+ WARN_ON(offset >= PAGE_SIZE);
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+
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+ bytes = PAGE_SIZE - offset;
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+ if (bytes > size)
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+ bytes = size;
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+
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+ info.page = page;
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+ gnttab_foreach_grant_in_range(page, offset, bytes,
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+ xenvif_gop_frag_copy_grant,
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+ &info);
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+ size -= bytes;
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+ offset = 0;
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+
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+ /* Next page */
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+ if (size) {
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+ WARN_ON(!PageCompound(page));
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+ page++;
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+ }
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+ }
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+
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+ *head = info.head;
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+}
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+
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+/* Prepare an SKB to be transmitted to the frontend.
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+ *
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+ * This function is responsible for allocating grant operations, meta
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+ * structures, etc.
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+ *
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+ * It returns the number of meta structures consumed. The number of
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+ * ring slots used is always equal to the number of meta slots used
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+ * plus the number of GSO descriptors used. Currently, we use either
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+ * zero GSO descriptors (for non-GSO packets) or one descriptor (for
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+ * frontend-side LRO).
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+ */
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+static int xenvif_gop_skb(struct sk_buff *skb,
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+ struct netrx_pending_operations *npo,
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+ struct xenvif_queue *queue)
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+{
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+ struct xenvif *vif = netdev_priv(skb->dev);
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+ int nr_frags = skb_shinfo(skb)->nr_frags;
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+ int i;
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+ struct xen_netif_rx_request req;
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+ struct xenvif_rx_meta *meta;
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+ unsigned char *data;
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+ int head = 1;
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+ int old_meta_prod;
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+ int gso_type;
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+
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+ old_meta_prod = npo->meta_prod;
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+
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+ gso_type = XEN_NETIF_GSO_TYPE_NONE;
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+ if (skb_is_gso(skb)) {
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+ if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
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+ gso_type = XEN_NETIF_GSO_TYPE_TCPV4;
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+ else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
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+ gso_type = XEN_NETIF_GSO_TYPE_TCPV6;
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+ }
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+
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+ /* Set up a GSO prefix descriptor, if necessary */
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+ if ((1 << gso_type) & vif->gso_prefix_mask) {
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+ RING_COPY_REQUEST(&queue->rx, queue->rx.req_cons++, &req);
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+ meta = npo->meta + npo->meta_prod++;
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+ meta->gso_type = gso_type;
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+ meta->gso_size = skb_shinfo(skb)->gso_size;
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+ meta->size = 0;
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+ meta->id = req.id;
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+ }
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+
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+ RING_COPY_REQUEST(&queue->rx, queue->rx.req_cons++, &req);
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+ meta = npo->meta + npo->meta_prod++;
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+
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+ if ((1 << gso_type) & vif->gso_mask) {
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+ meta->gso_type = gso_type;
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+ meta->gso_size = skb_shinfo(skb)->gso_size;
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+ } else {
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+ meta->gso_type = XEN_NETIF_GSO_TYPE_NONE;
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+ meta->gso_size = 0;
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+ }
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+
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+ meta->size = 0;
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+ meta->id = req.id;
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+ npo->copy_off = 0;
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+ npo->copy_gref = req.gref;
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+
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+ data = skb->data;
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+ while (data < skb_tail_pointer(skb)) {
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+ unsigned int offset = offset_in_page(data);
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+ unsigned int len = PAGE_SIZE - offset;
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+
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+ if (data + len > skb_tail_pointer(skb))
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+ len = skb_tail_pointer(skb) - data;
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+
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+ xenvif_gop_frag_copy(queue, skb, npo,
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+ virt_to_page(data), len, offset, &head);
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+ data += len;
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+ }
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+
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+ for (i = 0; i < nr_frags; i++) {
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+ xenvif_gop_frag_copy(queue, skb, npo,
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+ skb_frag_page(&skb_shinfo(skb)->frags[i]),
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+ skb_frag_size(&skb_shinfo(skb)->frags[i]),
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+ skb_shinfo(skb)->frags[i].page_offset,
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+ &head);
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+ }
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+
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+ return npo->meta_prod - old_meta_prod;
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+}
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+
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+/* This is a twin to xenvif_gop_skb. Assume that xenvif_gop_skb was
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+ * used to set up the operations on the top of
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+ * netrx_pending_operations, which have since been done. Check that
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+ * they didn't give any errors and advance over them.
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|
+ */
|
|
|
+static int xenvif_check_gop(struct xenvif *vif, int nr_meta_slots,
|
|
|
+ struct netrx_pending_operations *npo)
|
|
|
+{
|
|
|
+ struct gnttab_copy *copy_op;
|
|
|
+ int status = XEN_NETIF_RSP_OKAY;
|
|
|
+ int i;
|
|
|
+
|
|
|
+ for (i = 0; i < nr_meta_slots; i++) {
|
|
|
+ copy_op = npo->copy + npo->copy_cons++;
|
|
|
+ if (copy_op->status != GNTST_okay) {
|
|
|
+ netdev_dbg(vif->dev,
|
|
|
+ "Bad status %d from copy to DOM%d.\n",
|
|
|
+ copy_op->status, vif->domid);
|
|
|
+ status = XEN_NETIF_RSP_ERROR;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return status;
|
|
|
+}
|
|
|
+
|
|
|
+static struct xen_netif_rx_response *make_rx_response(
|
|
|
+ struct xenvif_queue *queue, u16 id, s8 st, u16 offset, u16 size,
|
|
|
+ u16 flags)
|
|
|
+{
|
|
|
+ RING_IDX i = queue->rx.rsp_prod_pvt;
|
|
|
+ struct xen_netif_rx_response *resp;
|
|
|
+
|
|
|
+ resp = RING_GET_RESPONSE(&queue->rx, i);
|
|
|
+ resp->offset = offset;
|
|
|
+ resp->flags = flags;
|
|
|
+ resp->id = id;
|
|
|
+ resp->status = (s16)size;
|
|
|
+ if (st < 0)
|
|
|
+ resp->status = (s16)st;
|
|
|
+
|
|
|
+ queue->rx.rsp_prod_pvt = ++i;
|
|
|
+
|
|
|
+ return resp;
|
|
|
+}
|
|
|
+
|
|
|
+static void xenvif_add_frag_responses(struct xenvif_queue *queue,
|
|
|
+ int status,
|
|
|
+ struct xenvif_rx_meta *meta,
|
|
|
+ int nr_meta_slots)
|
|
|
+{
|
|
|
+ int i;
|
|
|
+ unsigned long offset;
|
|
|
+
|
|
|
+ /* No fragments used */
|
|
|
+ if (nr_meta_slots <= 1)
|
|
|
+ return;
|
|
|
+
|
|
|
+ nr_meta_slots--;
|
|
|
+
|
|
|
+ for (i = 0; i < nr_meta_slots; i++) {
|
|
|
+ int flags;
|
|
|
+
|
|
|
+ if (i == nr_meta_slots - 1)
|
|
|
+ flags = 0;
|
|
|
+ else
|
|
|
+ flags = XEN_NETRXF_more_data;
|
|
|
+
|
|
|
+ offset = 0;
|
|
|
+ make_rx_response(queue, meta[i].id, status, offset,
|
|
|
+ meta[i].size, flags);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void xenvif_rx_action(struct xenvif_queue *queue)
|
|
|
+{
|
|
|
+ struct xenvif *vif = queue->vif;
|
|
|
+ s8 status;
|
|
|
+ u16 flags;
|
|
|
+ struct xen_netif_rx_response *resp;
|
|
|
+ struct sk_buff_head rxq;
|
|
|
+ struct sk_buff *skb;
|
|
|
+ LIST_HEAD(notify);
|
|
|
+ int ret;
|
|
|
+ unsigned long offset;
|
|
|
+ bool need_to_notify = false;
|
|
|
+
|
|
|
+ struct netrx_pending_operations npo = {
|
|
|
+ .copy = queue->grant_copy_op,
|
|
|
+ .meta = queue->meta,
|
|
|
+ };
|
|
|
+
|
|
|
+ skb_queue_head_init(&rxq);
|
|
|
+
|
|
|
+ while (xenvif_rx_ring_slots_available(queue) &&
|
|
|
+ (skb = xenvif_rx_dequeue(queue)) != NULL) {
|
|
|
+ queue->last_rx_time = jiffies;
|
|
|
+
|
|
|
+ XENVIF_RX_CB(skb)->meta_slots_used =
|
|
|
+ xenvif_gop_skb(skb, &npo, queue);
|
|
|
+
|
|
|
+ __skb_queue_tail(&rxq, skb);
|
|
|
+ }
|
|
|
+
|
|
|
+ WARN_ON(npo.meta_prod > ARRAY_SIZE(queue->meta));
|
|
|
+
|
|
|
+ if (!npo.copy_prod)
|
|
|
+ goto done;
|
|
|
+
|
|
|
+ WARN_ON(npo.copy_prod > MAX_GRANT_COPY_OPS);
|
|
|
+ gnttab_batch_copy(queue->grant_copy_op, npo.copy_prod);
|
|
|
+
|
|
|
+ while ((skb = __skb_dequeue(&rxq)) != NULL) {
|
|
|
+ struct xen_netif_extra_info *extra = NULL;
|
|
|
+
|
|
|
+ if ((1 << queue->meta[npo.meta_cons].gso_type) &
|
|
|
+ vif->gso_prefix_mask) {
|
|
|
+ resp = RING_GET_RESPONSE(&queue->rx,
|
|
|
+ queue->rx.rsp_prod_pvt++);
|
|
|
+
|
|
|
+ resp->flags = XEN_NETRXF_gso_prefix |
|
|
|
+ XEN_NETRXF_more_data;
|
|
|
+
|
|
|
+ resp->offset = queue->meta[npo.meta_cons].gso_size;
|
|
|
+ resp->id = queue->meta[npo.meta_cons].id;
|
|
|
+ resp->status = XENVIF_RX_CB(skb)->meta_slots_used;
|
|
|
+
|
|
|
+ npo.meta_cons++;
|
|
|
+ XENVIF_RX_CB(skb)->meta_slots_used--;
|
|
|
+ }
|
|
|
+
|
|
|
+ queue->stats.tx_bytes += skb->len;
|
|
|
+ queue->stats.tx_packets++;
|
|
|
+
|
|
|
+ status = xenvif_check_gop(vif,
|
|
|
+ XENVIF_RX_CB(skb)->meta_slots_used,
|
|
|
+ &npo);
|
|
|
+
|
|
|
+ if (XENVIF_RX_CB(skb)->meta_slots_used == 1)
|
|
|
+ flags = 0;
|
|
|
+ else
|
|
|
+ flags = XEN_NETRXF_more_data;
|
|
|
+
|
|
|
+ if (skb->ip_summed == CHECKSUM_PARTIAL) /* local packet? */
|
|
|
+ flags |= XEN_NETRXF_csum_blank |
|
|
|
+ XEN_NETRXF_data_validated;
|
|
|
+ else if (skb->ip_summed == CHECKSUM_UNNECESSARY)
|
|
|
+ /* remote but checksummed. */
|
|
|
+ flags |= XEN_NETRXF_data_validated;
|
|
|
+
|
|
|
+ offset = 0;
|
|
|
+ resp = make_rx_response(queue, queue->meta[npo.meta_cons].id,
|
|
|
+ status, offset,
|
|
|
+ queue->meta[npo.meta_cons].size,
|
|
|
+ flags);
|
|
|
+
|
|
|
+ if ((1 << queue->meta[npo.meta_cons].gso_type) &
|
|
|
+ vif->gso_mask) {
|
|
|
+ extra = (struct xen_netif_extra_info *)
|
|
|
+ RING_GET_RESPONSE(&queue->rx,
|
|
|
+ queue->rx.rsp_prod_pvt++);
|
|
|
+
|
|
|
+ resp->flags |= XEN_NETRXF_extra_info;
|
|
|
+
|
|
|
+ extra->u.gso.type = queue->meta[npo.meta_cons].gso_type;
|
|
|
+ extra->u.gso.size = queue->meta[npo.meta_cons].gso_size;
|
|
|
+ extra->u.gso.pad = 0;
|
|
|
+ extra->u.gso.features = 0;
|
|
|
+
|
|
|
+ extra->type = XEN_NETIF_EXTRA_TYPE_GSO;
|
|
|
+ extra->flags = 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (skb->sw_hash) {
|
|
|
+ /* Since the skb got here via xenvif_select_queue()
|
|
|
+ * we know that the hash has been re-calculated
|
|
|
+ * according to a configuration set by the frontend
|
|
|
+ * and therefore we know that it is legitimate to
|
|
|
+ * pass it to the frontend.
|
|
|
+ */
|
|
|
+ if (resp->flags & XEN_NETRXF_extra_info)
|
|
|
+ extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE;
|
|
|
+ else
|
|
|
+ resp->flags |= XEN_NETRXF_extra_info;
|
|
|
+
|
|
|
+ extra = (struct xen_netif_extra_info *)
|
|
|
+ RING_GET_RESPONSE(&queue->rx,
|
|
|
+ queue->rx.rsp_prod_pvt++);
|
|
|
+
|
|
|
+ extra->u.hash.algorithm =
|
|
|
+ XEN_NETIF_CTRL_HASH_ALGORITHM_TOEPLITZ;
|
|
|
+
|
|
|
+ if (skb->l4_hash)
|
|
|
+ extra->u.hash.type =
|
|
|
+ skb->protocol == htons(ETH_P_IP) ?
|
|
|
+ _XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP :
|
|
|
+ _XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP;
|
|
|
+ else
|
|
|
+ extra->u.hash.type =
|
|
|
+ skb->protocol == htons(ETH_P_IP) ?
|
|
|
+ _XEN_NETIF_CTRL_HASH_TYPE_IPV4 :
|
|
|
+ _XEN_NETIF_CTRL_HASH_TYPE_IPV6;
|
|
|
+
|
|
|
+ *(uint32_t *)extra->u.hash.value =
|
|
|
+ skb_get_hash_raw(skb);
|
|
|
+
|
|
|
+ extra->type = XEN_NETIF_EXTRA_TYPE_HASH;
|
|
|
+ extra->flags = 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ xenvif_add_frag_responses(queue, status,
|
|
|
+ queue->meta + npo.meta_cons + 1,
|
|
|
+ XENVIF_RX_CB(skb)->meta_slots_used);
|
|
|
+
|
|
|
+ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&queue->rx, ret);
|
|
|
+
|
|
|
+ need_to_notify |= !!ret;
|
|
|
+
|
|
|
+ npo.meta_cons += XENVIF_RX_CB(skb)->meta_slots_used;
|
|
|
+ dev_kfree_skb(skb);
|
|
|
+ }
|
|
|
+
|
|
|
+done:
|
|
|
+ if (need_to_notify)
|
|
|
+ notify_remote_via_irq(queue->rx_irq);
|
|
|
+}
|
|
|
+
|
|
|
+static bool xenvif_rx_queue_stalled(struct xenvif_queue *queue)
|
|
|
+{
|
|
|
+ RING_IDX prod, cons;
|
|
|
+
|
|
|
+ prod = queue->rx.sring->req_prod;
|
|
|
+ cons = queue->rx.req_cons;
|
|
|
+
|
|
|
+ return !queue->stalled &&
|
|
|
+ prod - cons < 1 &&
|
|
|
+ time_after(jiffies,
|
|
|
+ queue->last_rx_time + queue->vif->stall_timeout);
|
|
|
+}
|
|
|
+
|
|
|
+static bool xenvif_rx_queue_ready(struct xenvif_queue *queue)
|
|
|
+{
|
|
|
+ RING_IDX prod, cons;
|
|
|
+
|
|
|
+ prod = queue->rx.sring->req_prod;
|
|
|
+ cons = queue->rx.req_cons;
|
|
|
+
|
|
|
+ return queue->stalled && prod - cons >= 1;
|
|
|
+}
|
|
|
+
|
|
|
+static bool xenvif_have_rx_work(struct xenvif_queue *queue)
|
|
|
+{
|
|
|
+ return xenvif_rx_ring_slots_available(queue) ||
|
|
|
+ (queue->vif->stall_timeout &&
|
|
|
+ (xenvif_rx_queue_stalled(queue) ||
|
|
|
+ xenvif_rx_queue_ready(queue))) ||
|
|
|
+ kthread_should_stop() ||
|
|
|
+ queue->vif->disabled;
|
|
|
+}
|
|
|
+
|
|
|
+static long xenvif_rx_queue_timeout(struct xenvif_queue *queue)
|
|
|
+{
|
|
|
+ struct sk_buff *skb;
|
|
|
+ long timeout;
|
|
|
+
|
|
|
+ skb = skb_peek(&queue->rx_queue);
|
|
|
+ if (!skb)
|
|
|
+ return MAX_SCHEDULE_TIMEOUT;
|
|
|
+
|
|
|
+ timeout = XENVIF_RX_CB(skb)->expires - jiffies;
|
|
|
+ return timeout < 0 ? 0 : timeout;
|
|
|
+}
|
|
|
+
|
|
|
+/* Wait until the guest Rx thread has work.
|
|
|
+ *
|
|
|
+ * The timeout needs to be adjusted based on the current head of the
|
|
|
+ * queue (and not just the head at the beginning). In particular, if
|
|
|
+ * the queue is initially empty an infinite timeout is used and this
|
|
|
+ * needs to be reduced when a skb is queued.
|
|
|
+ *
|
|
|
+ * This cannot be done with wait_event_timeout() because it only
|
|
|
+ * calculates the timeout once.
|
|
|
+ */
|
|
|
+static void xenvif_wait_for_rx_work(struct xenvif_queue *queue)
|
|
|
+{
|
|
|
+ DEFINE_WAIT(wait);
|
|
|
+
|
|
|
+ if (xenvif_have_rx_work(queue))
|
|
|
+ return;
|
|
|
+
|
|
|
+ for (;;) {
|
|
|
+ long ret;
|
|
|
+
|
|
|
+ prepare_to_wait(&queue->wq, &wait, TASK_INTERRUPTIBLE);
|
|
|
+ if (xenvif_have_rx_work(queue))
|
|
|
+ break;
|
|
|
+ ret = schedule_timeout(xenvif_rx_queue_timeout(queue));
|
|
|
+ if (!ret)
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ finish_wait(&queue->wq, &wait);
|
|
|
+}
|
|
|
+
|
|
|
+static void xenvif_queue_carrier_off(struct xenvif_queue *queue)
|
|
|
+{
|
|
|
+ struct xenvif *vif = queue->vif;
|
|
|
+
|
|
|
+ queue->stalled = true;
|
|
|
+
|
|
|
+ /* At least one queue has stalled? Disable the carrier. */
|
|
|
+ spin_lock(&vif->lock);
|
|
|
+ if (vif->stalled_queues++ == 0) {
|
|
|
+ netdev_info(vif->dev, "Guest Rx stalled");
|
|
|
+ netif_carrier_off(vif->dev);
|
|
|
+ }
|
|
|
+ spin_unlock(&vif->lock);
|
|
|
+}
|
|
|
+
|
|
|
+static void xenvif_queue_carrier_on(struct xenvif_queue *queue)
|
|
|
+{
|
|
|
+ struct xenvif *vif = queue->vif;
|
|
|
+
|
|
|
+ queue->last_rx_time = jiffies; /* Reset Rx stall detection. */
|
|
|
+ queue->stalled = false;
|
|
|
+
|
|
|
+ /* All queues are ready? Enable the carrier. */
|
|
|
+ spin_lock(&vif->lock);
|
|
|
+ if (--vif->stalled_queues == 0) {
|
|
|
+ netdev_info(vif->dev, "Guest Rx ready");
|
|
|
+ netif_carrier_on(vif->dev);
|
|
|
+ }
|
|
|
+ spin_unlock(&vif->lock);
|
|
|
+}
|
|
|
+
|
|
|
+int xenvif_kthread_guest_rx(void *data)
|
|
|
+{
|
|
|
+ struct xenvif_queue *queue = data;
|
|
|
+ struct xenvif *vif = queue->vif;
|
|
|
+
|
|
|
+ if (!vif->stall_timeout)
|
|
|
+ xenvif_queue_carrier_on(queue);
|
|
|
+
|
|
|
+ for (;;) {
|
|
|
+ xenvif_wait_for_rx_work(queue);
|
|
|
+
|
|
|
+ if (kthread_should_stop())
|
|
|
+ break;
|
|
|
+
|
|
|
+ /* This frontend is found to be rogue, disable it in
|
|
|
+ * kthread context. Currently this is only set when
|
|
|
+ * netback finds out frontend sends malformed packet,
|
|
|
+ * but we cannot disable the interface in softirq
|
|
|
+ * context so we defer it here, if this thread is
|
|
|
+ * associated with queue 0.
|
|
|
+ */
|
|
|
+ if (unlikely(vif->disabled && queue->id == 0)) {
|
|
|
+ xenvif_carrier_off(vif);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!skb_queue_empty(&queue->rx_queue))
|
|
|
+ xenvif_rx_action(queue);
|
|
|
+
|
|
|
+ /* If the guest hasn't provided any Rx slots for a
|
|
|
+ * while it's probably not responsive, drop the
|
|
|
+ * carrier so packets are dropped earlier.
|
|
|
+ */
|
|
|
+ if (vif->stall_timeout) {
|
|
|
+ if (xenvif_rx_queue_stalled(queue))
|
|
|
+ xenvif_queue_carrier_off(queue);
|
|
|
+ else if (xenvif_rx_queue_ready(queue))
|
|
|
+ xenvif_queue_carrier_on(queue);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Queued packets may have foreign pages from other
|
|
|
+ * domains. These cannot be queued indefinitely as
|
|
|
+ * this would starve guests of grant refs and transmit
|
|
|
+ * slots.
|
|
|
+ */
|
|
|
+ xenvif_rx_queue_drop_expired(queue);
|
|
|
+
|
|
|
+ xenvif_rx_queue_maybe_wake(queue);
|
|
|
+
|
|
|
+ cond_resched();
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Bin any remaining skbs */
|
|
|
+ xenvif_rx_queue_purge(queue);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
Paul Durrant