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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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764 lines
19 KiB
C
764 lines
19 KiB
C
![]() |
/*
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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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#include "common.h"
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#include <linux/kthread.h>
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#include <xen/xen.h>
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#include <xen/events.h>
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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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skb = skb_peek(&queue->rx_queue);
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if (!skb)
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return false;
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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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do {
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prod = queue->rx.sring->req_prod;
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cons = queue->rx.req_cons;
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if (prod - cons >= needed)
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return true;
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queue->rx.sring->req_event = prod + 1;
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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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return false;
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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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spin_lock_irqsave(&queue->rx_queue.lock, flags);
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__skb_queue_tail(&queue->rx_queue, skb);
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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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netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));
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}
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spin_unlock_irqrestore(&queue->rx_queue.lock, flags);
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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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spin_lock_irq(&queue->rx_queue.lock);
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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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spin_unlock_irq(&queue->rx_queue.lock);
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return skb;
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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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if (queue->rx_queue_len < queue->rx_queue_max) {
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struct net_device *dev = queue->vif->dev;
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netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id));
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}
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spin_unlock_irq(&queue->rx_queue.lock);
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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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while ((skb = xenvif_rx_dequeue(queue)) != NULL)
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kfree_skb(skb);
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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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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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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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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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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 = 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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npo->copy_off = 0;
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npo->copy_gref = req.gref;
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return meta;
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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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struct page *page;
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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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WARN_ON(npo->copy_off > MAX_BUFFER_OFFSET);
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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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if (npo->copy_off + *len > MAX_BUFFER_OFFSET)
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*len = MAX_BUFFER_OFFSET - npo->copy_off;
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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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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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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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npo->copy_off += *len;
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info->meta->size += *len;
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if (!info->head)
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return;
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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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/* 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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info->head = 0; /* There must be something in this buffer now */
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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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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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/* 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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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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/* Data must not cross a page boundary. */
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WARN_ON(size + offset > (PAGE_SIZE << compound_order(page)));
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info.meta = npo->meta + npo->meta_prod - 1;
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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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while (size > 0) {
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WARN_ON(offset >= PAGE_SIZE);
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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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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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/* 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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*head = info.head;
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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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old_meta_prod = npo->meta_prod;
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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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RING_COPY_REQUEST(&queue->rx, queue->rx.req_cons++, &req);
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meta = npo->meta + npo->meta_prod++;
|
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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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|
}
|
||
|
|
||
|
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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|
}
|
||
|
|
||
|
/* 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.
|
||
|
*/
|
||
|
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",
|
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|
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;
|
||
|
|
||
|
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;
|
||
|
}
|