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656 lines
16 KiB
656 lines
16 KiB
/* |
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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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|
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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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unsigned long flags; |
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spin_lock_irqsave(&queue->rx_queue.lock, flags); |
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skb = skb_peek(&queue->rx_queue); |
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if (!skb) { |
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spin_unlock_irqrestore(&queue->rx_queue.lock, flags); |
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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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spin_unlock_irqrestore(&queue->rx_queue.lock, flags); |
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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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if (queue->rx_queue_len < queue->rx_queue_max) { |
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struct netdev_queue *txq; |
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txq = netdev_get_tx_queue(queue->vif->dev, queue->id); |
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netif_tx_wake_queue(txq); |
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} |
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} |
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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_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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static void xenvif_rx_copy_flush(struct xenvif_queue *queue) |
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{ |
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unsigned int i; |
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int notify; |
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gnttab_batch_copy(queue->rx_copy.op, queue->rx_copy.num); |
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for (i = 0; i < queue->rx_copy.num; i++) { |
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struct gnttab_copy *op; |
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op = &queue->rx_copy.op[i]; |
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/* If the copy failed, overwrite the status field in |
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* the corresponding response. |
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*/ |
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if (unlikely(op->status != GNTST_okay)) { |
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struct xen_netif_rx_response *rsp; |
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rsp = RING_GET_RESPONSE(&queue->rx, |
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queue->rx_copy.idx[i]); |
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rsp->status = op->status; |
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} |
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} |
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queue->rx_copy.num = 0; |
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/* Push responses for all completed packets. */ |
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RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&queue->rx, notify); |
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if (notify) |
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notify_remote_via_irq(queue->rx_irq); |
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__skb_queue_purge(queue->rx_copy.completed); |
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} |
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static void xenvif_rx_copy_add(struct xenvif_queue *queue, |
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struct xen_netif_rx_request *req, |
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unsigned int offset, void *data, size_t len) |
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{ |
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struct gnttab_copy *op; |
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struct page *page; |
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struct xen_page_foreign *foreign; |
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if (queue->rx_copy.num == COPY_BATCH_SIZE) |
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xenvif_rx_copy_flush(queue); |
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op = &queue->rx_copy.op[queue->rx_copy.num]; |
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page = virt_to_page(data); |
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op->flags = GNTCOPY_dest_gref; |
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foreign = xen_page_foreign(page); |
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if (foreign) { |
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op->source.domid = foreign->domid; |
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op->source.u.ref = foreign->gref; |
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op->flags |= GNTCOPY_source_gref; |
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} else { |
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op->source.u.gmfn = virt_to_gfn(data); |
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op->source.domid = DOMID_SELF; |
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} |
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op->source.offset = xen_offset_in_page(data); |
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op->dest.u.ref = req->gref; |
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op->dest.domid = queue->vif->domid; |
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op->dest.offset = offset; |
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op->len = len; |
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queue->rx_copy.idx[queue->rx_copy.num] = queue->rx.req_cons; |
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queue->rx_copy.num++; |
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} |
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static unsigned int xenvif_gso_type(struct sk_buff *skb) |
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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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return XEN_NETIF_GSO_TYPE_TCPV4; |
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else |
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return XEN_NETIF_GSO_TYPE_TCPV6; |
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} |
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return XEN_NETIF_GSO_TYPE_NONE; |
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} |
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struct xenvif_pkt_state { |
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struct sk_buff *skb; |
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size_t remaining_len; |
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struct sk_buff *frag_iter; |
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int frag; /* frag == -1 => frag_iter->head */ |
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unsigned int frag_offset; |
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struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; |
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unsigned int extra_count; |
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unsigned int slot; |
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}; |
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static void xenvif_rx_next_skb(struct xenvif_queue *queue, |
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struct xenvif_pkt_state *pkt) |
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{ |
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struct sk_buff *skb; |
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unsigned int gso_type; |
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skb = xenvif_rx_dequeue(queue); |
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queue->stats.tx_bytes += skb->len; |
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queue->stats.tx_packets++; |
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/* Reset packet state. */ |
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memset(pkt, 0, sizeof(struct xenvif_pkt_state)); |
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pkt->skb = skb; |
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pkt->frag_iter = skb; |
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pkt->remaining_len = skb->len; |
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pkt->frag = -1; |
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gso_type = xenvif_gso_type(skb); |
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if ((1 << gso_type) & queue->vif->gso_mask) { |
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struct xen_netif_extra_info *extra; |
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extra = &pkt->extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; |
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extra->u.gso.type = gso_type; |
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extra->u.gso.size = skb_shinfo(skb)->gso_size; |
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extra->u.gso.pad = 0; |
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extra->u.gso.features = 0; |
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extra->type = XEN_NETIF_EXTRA_TYPE_GSO; |
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extra->flags = 0; |
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pkt->extra_count++; |
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} |
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if (queue->vif->xdp_headroom) { |
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struct xen_netif_extra_info *extra; |
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extra = &pkt->extras[XEN_NETIF_EXTRA_TYPE_XDP - 1]; |
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memset(extra, 0, sizeof(struct xen_netif_extra_info)); |
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extra->u.xdp.headroom = queue->vif->xdp_headroom; |
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extra->type = XEN_NETIF_EXTRA_TYPE_XDP; |
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extra->flags = 0; |
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pkt->extra_count++; |
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} |
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if (skb->sw_hash) { |
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struct xen_netif_extra_info *extra; |
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extra = &pkt->extras[XEN_NETIF_EXTRA_TYPE_HASH - 1]; |
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extra->u.hash.algorithm = |
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XEN_NETIF_CTRL_HASH_ALGORITHM_TOEPLITZ; |
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if (skb->l4_hash) |
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extra->u.hash.type = |
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skb->protocol == htons(ETH_P_IP) ? |
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_XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP : |
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_XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP; |
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else |
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extra->u.hash.type = |
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skb->protocol == htons(ETH_P_IP) ? |
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_XEN_NETIF_CTRL_HASH_TYPE_IPV4 : |
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_XEN_NETIF_CTRL_HASH_TYPE_IPV6; |
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*(uint32_t *)extra->u.hash.value = skb_get_hash_raw(skb); |
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extra->type = XEN_NETIF_EXTRA_TYPE_HASH; |
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extra->flags = 0; |
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pkt->extra_count++; |
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} |
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} |
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static void xenvif_rx_complete(struct xenvif_queue *queue, |
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struct xenvif_pkt_state *pkt) |
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{ |
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/* All responses are ready to be pushed. */ |
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queue->rx.rsp_prod_pvt = queue->rx.req_cons; |
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__skb_queue_tail(queue->rx_copy.completed, pkt->skb); |
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} |
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static void xenvif_rx_next_frag(struct xenvif_pkt_state *pkt) |
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{ |
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struct sk_buff *frag_iter = pkt->frag_iter; |
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unsigned int nr_frags = skb_shinfo(frag_iter)->nr_frags; |
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pkt->frag++; |
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pkt->frag_offset = 0; |
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if (pkt->frag >= nr_frags) { |
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if (frag_iter == pkt->skb) |
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pkt->frag_iter = skb_shinfo(frag_iter)->frag_list; |
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else |
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pkt->frag_iter = frag_iter->next; |
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pkt->frag = -1; |
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} |
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} |
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static void xenvif_rx_next_chunk(struct xenvif_queue *queue, |
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struct xenvif_pkt_state *pkt, |
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unsigned int offset, void **data, |
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size_t *len) |
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{ |
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struct sk_buff *frag_iter = pkt->frag_iter; |
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void *frag_data; |
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size_t frag_len, chunk_len; |
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BUG_ON(!frag_iter); |
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if (pkt->frag == -1) { |
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frag_data = frag_iter->data; |
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frag_len = skb_headlen(frag_iter); |
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} else { |
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skb_frag_t *frag = &skb_shinfo(frag_iter)->frags[pkt->frag]; |
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frag_data = skb_frag_address(frag); |
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frag_len = skb_frag_size(frag); |
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} |
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frag_data += pkt->frag_offset; |
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frag_len -= pkt->frag_offset; |
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chunk_len = min_t(size_t, frag_len, XEN_PAGE_SIZE - offset); |
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chunk_len = min_t(size_t, chunk_len, XEN_PAGE_SIZE - |
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xen_offset_in_page(frag_data)); |
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pkt->frag_offset += chunk_len; |
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/* Advance to next frag? */ |
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if (frag_len == chunk_len) |
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xenvif_rx_next_frag(pkt); |
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*data = frag_data; |
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*len = chunk_len; |
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} |
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static void xenvif_rx_data_slot(struct xenvif_queue *queue, |
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struct xenvif_pkt_state *pkt, |
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struct xen_netif_rx_request *req, |
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struct xen_netif_rx_response *rsp) |
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{ |
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unsigned int offset = queue->vif->xdp_headroom; |
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unsigned int flags; |
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do { |
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size_t len; |
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void *data; |
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xenvif_rx_next_chunk(queue, pkt, offset, &data, &len); |
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xenvif_rx_copy_add(queue, req, offset, data, len); |
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offset += len; |
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pkt->remaining_len -= len; |
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} while (offset < XEN_PAGE_SIZE && pkt->remaining_len > 0); |
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if (pkt->remaining_len > 0) |
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flags = XEN_NETRXF_more_data; |
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else |
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flags = 0; |
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if (pkt->slot == 0) { |
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struct sk_buff *skb = pkt->skb; |
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if (skb->ip_summed == CHECKSUM_PARTIAL) |
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flags |= XEN_NETRXF_csum_blank | |
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XEN_NETRXF_data_validated; |
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else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
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flags |= XEN_NETRXF_data_validated; |
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if (pkt->extra_count != 0) |
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flags |= XEN_NETRXF_extra_info; |
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} |
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rsp->offset = 0; |
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rsp->flags = flags; |
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rsp->id = req->id; |
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rsp->status = (s16)offset; |
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} |
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static void xenvif_rx_extra_slot(struct xenvif_queue *queue, |
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struct xenvif_pkt_state *pkt, |
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struct xen_netif_rx_request *req, |
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struct xen_netif_rx_response *rsp) |
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{ |
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struct xen_netif_extra_info *extra = (void *)rsp; |
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unsigned int i; |
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pkt->extra_count--; |
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for (i = 0; i < ARRAY_SIZE(pkt->extras); i++) { |
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if (pkt->extras[i].type) { |
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*extra = pkt->extras[i]; |
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if (pkt->extra_count != 0) |
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extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE; |
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pkt->extras[i].type = 0; |
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return; |
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} |
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} |
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BUG(); |
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} |
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static void xenvif_rx_skb(struct xenvif_queue *queue) |
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{ |
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struct xenvif_pkt_state pkt; |
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xenvif_rx_next_skb(queue, &pkt); |
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queue->last_rx_time = jiffies; |
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do { |
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struct xen_netif_rx_request *req; |
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struct xen_netif_rx_response *rsp; |
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req = RING_GET_REQUEST(&queue->rx, queue->rx.req_cons); |
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rsp = RING_GET_RESPONSE(&queue->rx, queue->rx.req_cons); |
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/* Extras must go after the first data slot */ |
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if (pkt.slot != 0 && pkt.extra_count != 0) |
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xenvif_rx_extra_slot(queue, &pkt, req, rsp); |
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else |
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xenvif_rx_data_slot(queue, &pkt, req, rsp); |
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|
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queue->rx.req_cons++; |
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pkt.slot++; |
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} while (pkt.remaining_len > 0 || pkt.extra_count != 0); |
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|
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xenvif_rx_complete(queue, &pkt); |
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} |
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#define RX_BATCH_SIZE 64 |
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void xenvif_rx_action(struct xenvif_queue *queue) |
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{ |
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struct sk_buff_head completed_skbs; |
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unsigned int work_done = 0; |
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|
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__skb_queue_head_init(&completed_skbs); |
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queue->rx_copy.completed = &completed_skbs; |
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|
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while (xenvif_rx_ring_slots_available(queue) && |
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work_done < RX_BATCH_SIZE) { |
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xenvif_rx_skb(queue); |
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work_done++; |
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} |
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|
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/* Flush any pending copies and complete all skbs. */ |
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xenvif_rx_copy_flush(queue); |
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} |
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static bool xenvif_rx_queue_stalled(struct xenvif_queue *queue) |
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{ |
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RING_IDX prod, cons; |
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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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return !queue->stalled && |
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prod - cons < 1 && |
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time_after(jiffies, |
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queue->last_rx_time + queue->vif->stall_timeout); |
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} |
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static bool xenvif_rx_queue_ready(struct xenvif_queue *queue) |
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{ |
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RING_IDX prod, cons; |
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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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return queue->stalled && prod - cons >= 1; |
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} |
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bool xenvif_have_rx_work(struct xenvif_queue *queue, bool test_kthread) |
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{ |
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return xenvif_rx_ring_slots_available(queue) || |
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(queue->vif->stall_timeout && |
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(xenvif_rx_queue_stalled(queue) || |
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xenvif_rx_queue_ready(queue))) || |
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(test_kthread && kthread_should_stop()) || |
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queue->vif->disabled; |
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} |
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|
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static long xenvif_rx_queue_timeout(struct xenvif_queue *queue) |
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{ |
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struct sk_buff *skb; |
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long timeout; |
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skb = skb_peek(&queue->rx_queue); |
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if (!skb) |
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return MAX_SCHEDULE_TIMEOUT; |
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timeout = XENVIF_RX_CB(skb)->expires - jiffies; |
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return timeout < 0 ? 0 : timeout; |
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} |
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|
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/* Wait until the guest Rx thread has work. |
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* |
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* The timeout needs to be adjusted based on the current head of the |
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* queue (and not just the head at the beginning). In particular, if |
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* the queue is initially empty an infinite timeout is used and this |
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* needs to be reduced when a skb is queued. |
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* |
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* This cannot be done with wait_event_timeout() because it only |
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* calculates the timeout once. |
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*/ |
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static void xenvif_wait_for_rx_work(struct xenvif_queue *queue) |
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{ |
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DEFINE_WAIT(wait); |
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|
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if (xenvif_have_rx_work(queue, true)) |
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return; |
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|
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for (;;) { |
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long ret; |
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prepare_to_wait(&queue->wq, &wait, TASK_INTERRUPTIBLE); |
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if (xenvif_have_rx_work(queue, true)) |
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break; |
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if (atomic_fetch_andnot(NETBK_RX_EOI | NETBK_COMMON_EOI, |
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&queue->eoi_pending) & |
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(NETBK_RX_EOI | NETBK_COMMON_EOI)) |
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xen_irq_lateeoi(queue->rx_irq, 0); |
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|
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ret = schedule_timeout(xenvif_rx_queue_timeout(queue)); |
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if (!ret) |
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break; |
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} |
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finish_wait(&queue->wq, &wait); |
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} |
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|
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static void xenvif_queue_carrier_off(struct xenvif_queue *queue) |
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{ |
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struct xenvif *vif = queue->vif; |
|
|
|
queue->stalled = true; |
|
|
|
/* At least one queue has stalled? Disable the carrier. */ |
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spin_lock(&vif->lock); |
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if (vif->stalled_queues++ == 0) { |
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netdev_info(vif->dev, "Guest Rx stalled"); |
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netif_carrier_off(vif->dev); |
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} |
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spin_unlock(&vif->lock); |
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} |
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|
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static void xenvif_queue_carrier_on(struct xenvif_queue *queue) |
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{ |
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struct xenvif *vif = queue->vif; |
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|
|
queue->last_rx_time = jiffies; /* Reset Rx stall detection. */ |
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queue->stalled = false; |
|
|
|
/* All queues are ready? Enable the carrier. */ |
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spin_lock(&vif->lock); |
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if (--vif->stalled_queues == 0) { |
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netdev_info(vif->dev, "Guest Rx ready"); |
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netif_carrier_on(vif->dev); |
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} |
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spin_unlock(&vif->lock); |
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} |
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|
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int xenvif_kthread_guest_rx(void *data) |
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{ |
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struct xenvif_queue *queue = data; |
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struct xenvif *vif = queue->vif; |
|
|
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if (!vif->stall_timeout) |
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xenvif_queue_carrier_on(queue); |
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|
|
for (;;) { |
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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)) { |
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xenvif_carrier_off(vif); |
|
break; |
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} |
|
|
|
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); |
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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); |
|
|
|
cond_resched(); |
|
} |
|
|
|
/* Bin any remaining skbs */ |
|
xenvif_rx_queue_purge(queue); |
|
|
|
return 0; |
|
}
|
|
|