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[Xen-devel] [PATCH V7 net-next 5/7] xen-netfront: Factor queue-specific data into queue struct.



From: "Andrew J. Bennieston" <andrew.bennieston@xxxxxxxxxx>

In preparation for multi-queue support in xen-netfront, move the
queue-specific data from struct netfront_info to struct netfront_queue,
and update the rest of the code to use this.

Also adds loops over queues where appropriate, even though only one is
configured at this point, and uses alloc_etherdev_mq() and the
corresponding multi-queue netif wake/start/stop functions in preparation
for multiple active queues.

Finally, implements a trivial queue selection function suitable for
ndo_select_queue, which simply returns 0, selecting the first (and
only) queue.

Signed-off-by: Andrew J. Bennieston <andrew.bennieston@xxxxxxxxxx>
Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 drivers/net/xen-netfront.c |  972 ++++++++++++++++++++++++++------------------
 1 file changed, 579 insertions(+), 393 deletions(-)

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 158b5e6..f2aa7e8 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -73,6 +73,12 @@ struct netfront_cb {
 #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE)
 #define TX_MAX_TARGET min_t(int, NET_TX_RING_SIZE, 256)
 
+/* Queue name is interface name with "-qNNN" appended */
+#define QUEUE_NAME_SIZE (IFNAMSIZ + 6)
+
+/* IRQ name is queue name with "-tx" or "-rx" appended */
+#define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3)
+
 struct netfront_stats {
        u64                     rx_packets;
        u64                     tx_packets;
@@ -81,9 +87,12 @@ struct netfront_stats {
        struct u64_stats_sync   syncp;
 };
 
-struct netfront_info {
-       struct list_head list;
-       struct net_device *netdev;
+struct netfront_info;
+
+struct netfront_queue {
+       unsigned int id; /* Queue ID, 0-based */
+       char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */
+       struct netfront_info *info;
 
        struct napi_struct napi;
 
@@ -93,10 +102,8 @@ struct netfront_info {
        unsigned int tx_evtchn, rx_evtchn;
        unsigned int tx_irq, rx_irq;
        /* Only used when split event channels support is enabled */
-       char tx_irq_name[IFNAMSIZ+4]; /* DEVNAME-tx */
-       char rx_irq_name[IFNAMSIZ+4]; /* DEVNAME-rx */
-
-       struct xenbus_device *xbdev;
+       char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */
+       char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */
 
        spinlock_t   tx_lock;
        struct xen_netif_tx_front_ring tx;
@@ -140,11 +147,21 @@ struct netfront_info {
        unsigned long rx_pfn_array[NET_RX_RING_SIZE];
        struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1];
        struct mmu_update rx_mmu[NET_RX_RING_SIZE];
+};
+
+struct netfront_info {
+       struct list_head list;
+       struct net_device *netdev;
+
+       struct xenbus_device *xbdev;
+
+       /* Multi-queue support */
+       struct netfront_queue *queues;
 
        /* Statistics */
        struct netfront_stats __percpu *stats;
 
-       unsigned long rx_gso_checksum_fixup;
+       atomic_t rx_gso_checksum_fixup;
 };
 
 struct netfront_rx_info {
@@ -187,21 +204,21 @@ static int xennet_rxidx(RING_IDX idx)
        return idx & (NET_RX_RING_SIZE - 1);
 }
 
-static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np,
+static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue,
                                         RING_IDX ri)
 {
        int i = xennet_rxidx(ri);
-       struct sk_buff *skb = np->rx_skbs[i];
-       np->rx_skbs[i] = NULL;
+       struct sk_buff *skb = queue->rx_skbs[i];
+       queue->rx_skbs[i] = NULL;
        return skb;
 }
 
-static grant_ref_t xennet_get_rx_ref(struct netfront_info *np,
+static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue,
                                            RING_IDX ri)
 {
        int i = xennet_rxidx(ri);
-       grant_ref_t ref = np->grant_rx_ref[i];
-       np->grant_rx_ref[i] = GRANT_INVALID_REF;
+       grant_ref_t ref = queue->grant_rx_ref[i];
+       queue->grant_rx_ref[i] = GRANT_INVALID_REF;
        return ref;
 }
 
@@ -221,41 +238,40 @@ static bool xennet_can_sg(struct net_device *dev)
 
 static void rx_refill_timeout(unsigned long data)
 {
-       struct net_device *dev = (struct net_device *)data;
-       struct netfront_info *np = netdev_priv(dev);
-       napi_schedule(&np->napi);
+       struct netfront_queue *queue = (struct netfront_queue *)data;
+       napi_schedule(&queue->napi);
 }
 
-static int netfront_tx_slot_available(struct netfront_info *np)
+static int netfront_tx_slot_available(struct netfront_queue *queue)
 {
-       return (np->tx.req_prod_pvt - np->tx.rsp_cons) <
+       return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) <
                (TX_MAX_TARGET - MAX_SKB_FRAGS - 2);
 }
 
-static void xennet_maybe_wake_tx(struct net_device *dev)
+static void xennet_maybe_wake_tx(struct netfront_queue *queue)
 {
-       struct netfront_info *np = netdev_priv(dev);
+       struct net_device *dev = queue->info->netdev;
+       struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id);
 
-       if (unlikely(netif_queue_stopped(dev)) &&
-           netfront_tx_slot_available(np) &&
+       if (unlikely(netif_tx_queue_stopped(dev_queue)) &&
+           netfront_tx_slot_available(queue) &&
            likely(netif_running(dev)))
-               netif_wake_queue(dev);
+               netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id));
 }
 
-static void xennet_alloc_rx_buffers(struct net_device *dev)
+static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
 {
        unsigned short id;
-       struct netfront_info *np = netdev_priv(dev);
        struct sk_buff *skb;
        struct page *page;
        int i, batch_target, notify;
-       RING_IDX req_prod = np->rx.req_prod_pvt;
+       RING_IDX req_prod = queue->rx.req_prod_pvt;
        grant_ref_t ref;
        unsigned long pfn;
        void *vaddr;
        struct xen_netif_rx_request *req;
 
-       if (unlikely(!netif_carrier_ok(dev)))
+       if (unlikely(!netif_carrier_ok(queue->info->netdev)))
                return;
 
        /*
@@ -264,9 +280,10 @@ static void xennet_alloc_rx_buffers(struct net_device *dev)
         * allocator, so should reduce the chance of failed allocation requests
         * both for ourself and for other kernel subsystems.
         */
-       batch_target = np->rx_target - (req_prod - np->rx.rsp_cons);
-       for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) {
-               skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN,
+       batch_target = queue->rx_target - (req_prod - queue->rx.rsp_cons);
+       for (i = skb_queue_len(&queue->rx_batch); i < batch_target; i++) {
+               skb = __netdev_alloc_skb(queue->info->netdev,
+                                        RX_COPY_THRESHOLD + NET_IP_ALIGN,
                                         GFP_ATOMIC | __GFP_NOWARN);
                if (unlikely(!skb))
                        goto no_skb;
@@ -279,7 +296,7 @@ static void xennet_alloc_rx_buffers(struct net_device *dev)
                        kfree_skb(skb);
 no_skb:
                        /* Could not allocate any skbuffs. Try again later. */
-                       mod_timer(&np->rx_refill_timer,
+                       mod_timer(&queue->rx_refill_timer,
                                  jiffies + (HZ/10));
 
                        /* Any skbuffs queued for refill? Force them out. */
@@ -289,44 +306,44 @@ no_skb:
                }
 
                skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE);
-               __skb_queue_tail(&np->rx_batch, skb);
+               __skb_queue_tail(&queue->rx_batch, skb);
        }
 
        /* Is the batch large enough to be worthwhile? */
-       if (i < (np->rx_target/2)) {
-               if (req_prod > np->rx.sring->req_prod)
+       if (i < (queue->rx_target/2)) {
+               if (req_prod > queue->rx.sring->req_prod)
                        goto push;
                return;
        }
 
        /* Adjust our fill target if we risked running out of buffers. */
-       if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) &&
-           ((np->rx_target *= 2) > np->rx_max_target))
-               np->rx_target = np->rx_max_target;
+       if (((req_prod - queue->rx.sring->rsp_prod) < (queue->rx_target / 4)) &&
+           ((queue->rx_target *= 2) > queue->rx_max_target))
+               queue->rx_target = queue->rx_max_target;
 
  refill:
        for (i = 0; ; i++) {
-               skb = __skb_dequeue(&np->rx_batch);
+               skb = __skb_dequeue(&queue->rx_batch);
                if (skb == NULL)
                        break;
 
-               skb->dev = dev;
+               skb->dev = queue->info->netdev;
 
                id = xennet_rxidx(req_prod + i);
 
-               BUG_ON(np->rx_skbs[id]);
-               np->rx_skbs[id] = skb;
+               BUG_ON(queue->rx_skbs[id]);
+               queue->rx_skbs[id] = skb;
 
-               ref = gnttab_claim_grant_reference(&np->gref_rx_head);
+               ref = gnttab_claim_grant_reference(&queue->gref_rx_head);
                BUG_ON((signed short)ref < 0);
-               np->grant_rx_ref[id] = ref;
+               queue->grant_rx_ref[id] = ref;
 
                pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0]));
                vaddr = page_address(skb_frag_page(&skb_shinfo(skb)->frags[0]));
 
-               req = RING_GET_REQUEST(&np->rx, req_prod + i);
+               req = RING_GET_REQUEST(&queue->rx, req_prod + i);
                gnttab_grant_foreign_access_ref(ref,
-                                               np->xbdev->otherend_id,
+                                               queue->info->xbdev->otherend_id,
                                                pfn_to_mfn(pfn),
                                                0);
 
@@ -337,72 +354,77 @@ no_skb:
        wmb();          /* barrier so backend seens requests */
 
        /* Above is a suitable barrier to ensure backend will see requests. */
-       np->rx.req_prod_pvt = req_prod + i;
+       queue->rx.req_prod_pvt = req_prod + i;
  push:
-       RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify);
+       RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify);
        if (notify)
-               notify_remote_via_irq(np->rx_irq);
+               notify_remote_via_irq(queue->rx_irq);
 }
 
 static int xennet_open(struct net_device *dev)
 {
        struct netfront_info *np = netdev_priv(dev);
-
-       napi_enable(&np->napi);
-
-       spin_lock_bh(&np->rx_lock);
-       if (netif_carrier_ok(dev)) {
-               xennet_alloc_rx_buffers(dev);
-               np->rx.sring->rsp_event = np->rx.rsp_cons + 1;
-               if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx))
-                       napi_schedule(&np->napi);
+       unsigned int num_queues = dev->real_num_tx_queues;
+       unsigned int i = 0;
+       struct netfront_queue *queue = NULL;
+
+       for (i = 0; i < num_queues; ++i) {
+               queue = &np->queues[i];
+               napi_enable(&queue->napi);
+
+               spin_lock_bh(&queue->rx_lock);
+               if (netif_carrier_ok(dev)) {
+                       xennet_alloc_rx_buffers(queue);
+                       queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1;
+                       if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx))
+                               napi_schedule(&queue->napi);
+               }
+               spin_unlock_bh(&queue->rx_lock);
        }
-       spin_unlock_bh(&np->rx_lock);
 
-       netif_start_queue(dev);
+       netif_tx_start_all_queues(dev);
 
        return 0;
 }
 
-static void xennet_tx_buf_gc(struct net_device *dev)
+static void xennet_tx_buf_gc(struct netfront_queue *queue)
 {
        RING_IDX cons, prod;
        unsigned short id;
-       struct netfront_info *np = netdev_priv(dev);
        struct sk_buff *skb;
 
-       BUG_ON(!netif_carrier_ok(dev));
+       BUG_ON(!netif_carrier_ok(queue->info->netdev));
 
        do {
-               prod = np->tx.sring->rsp_prod;
+               prod = queue->tx.sring->rsp_prod;
                rmb(); /* Ensure we see responses up to 'rp'. */
 
-               for (cons = np->tx.rsp_cons; cons != prod; cons++) {
+               for (cons = queue->tx.rsp_cons; cons != prod; cons++) {
                        struct xen_netif_tx_response *txrsp;
 
-                       txrsp = RING_GET_RESPONSE(&np->tx, cons);
+                       txrsp = RING_GET_RESPONSE(&queue->tx, cons);
                        if (txrsp->status == XEN_NETIF_RSP_NULL)
                                continue;
 
                        id  = txrsp->id;
-                       skb = np->tx_skbs[id].skb;
+                       skb = queue->tx_skbs[id].skb;
                        if (unlikely(gnttab_query_foreign_access(
-                               np->grant_tx_ref[id]) != 0)) {
+                               queue->grant_tx_ref[id]) != 0)) {
                                pr_alert("%s: warning -- grant still in use by 
backend domain\n",
                                         __func__);
                                BUG();
                        }
                        gnttab_end_foreign_access_ref(
-                               np->grant_tx_ref[id], GNTMAP_readonly);
+                               queue->grant_tx_ref[id], GNTMAP_readonly);
                        gnttab_release_grant_reference(
-                               &np->gref_tx_head, np->grant_tx_ref[id]);
-                       np->grant_tx_ref[id] = GRANT_INVALID_REF;
-                       np->grant_tx_page[id] = NULL;
-                       add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, 
id);
+                               &queue->gref_tx_head, queue->grant_tx_ref[id]);
+                       queue->grant_tx_ref[id] = GRANT_INVALID_REF;
+                       queue->grant_tx_page[id] = NULL;
+                       add_id_to_freelist(&queue->tx_skb_freelist, 
queue->tx_skbs, id);
                        dev_kfree_skb_irq(skb);
                }
 
-               np->tx.rsp_cons = prod;
+               queue->tx.rsp_cons = prod;
 
                /*
                 * Set a new event, then check for race with update of tx_cons.
@@ -412,21 +434,20 @@ static void xennet_tx_buf_gc(struct net_device *dev)
                 * data is outstanding: in such cases notification from Xen is
                 * likely to be the only kick that we'll get.
                 */
-               np->tx.sring->rsp_event =
-                       prod + ((np->tx.sring->req_prod - prod) >> 1) + 1;
+               queue->tx.sring->rsp_event =
+                       prod + ((queue->tx.sring->req_prod - prod) >> 1) + 1;
                mb();           /* update shared area */
-       } while ((cons == prod) && (prod != np->tx.sring->rsp_prod));
+       } while ((cons == prod) && (prod != queue->tx.sring->rsp_prod));
 
-       xennet_maybe_wake_tx(dev);
+       xennet_maybe_wake_tx(queue);
 }
 
-static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev,
+static void xennet_make_frags(struct sk_buff *skb, struct netfront_queue 
*queue,
                              struct xen_netif_tx_request *tx)
 {
-       struct netfront_info *np = netdev_priv(dev);
        char *data = skb->data;
        unsigned long mfn;
-       RING_IDX prod = np->tx.req_prod_pvt;
+       RING_IDX prod = queue->tx.req_prod_pvt;
        int frags = skb_shinfo(skb)->nr_frags;
        unsigned int offset = offset_in_page(data);
        unsigned int len = skb_headlen(skb);
@@ -443,19 +464,19 @@ static void xennet_make_frags(struct sk_buff *skb, struct 
net_device *dev,
                data += tx->size;
                offset = 0;
 
-               id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs);
-               np->tx_skbs[id].skb = skb_get(skb);
-               tx = RING_GET_REQUEST(&np->tx, prod++);
+               id = get_id_from_freelist(&queue->tx_skb_freelist, 
queue->tx_skbs);
+               queue->tx_skbs[id].skb = skb_get(skb);
+               tx = RING_GET_REQUEST(&queue->tx, prod++);
                tx->id = id;
-               ref = gnttab_claim_grant_reference(&np->gref_tx_head);
+               ref = gnttab_claim_grant_reference(&queue->gref_tx_head);
                BUG_ON((signed short)ref < 0);
 
                mfn = virt_to_mfn(data);
-               gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id,
+               gnttab_grant_foreign_access_ref(ref, 
queue->info->xbdev->otherend_id,
                                                mfn, GNTMAP_readonly);
 
-               np->grant_tx_page[id] = virt_to_page(data);
-               tx->gref = np->grant_tx_ref[id] = ref;
+               queue->grant_tx_page[id] = virt_to_page(data);
+               tx->gref = queue->grant_tx_ref[id] = ref;
                tx->offset = offset;
                tx->size = len;
                tx->flags = 0;
@@ -487,21 +508,21 @@ static void xennet_make_frags(struct sk_buff *skb, struct 
net_device *dev,
 
                        tx->flags |= XEN_NETTXF_more_data;
 
-                       id = get_id_from_freelist(&np->tx_skb_freelist,
-                                                 np->tx_skbs);
-                       np->tx_skbs[id].skb = skb_get(skb);
-                       tx = RING_GET_REQUEST(&np->tx, prod++);
+                       id = get_id_from_freelist(&queue->tx_skb_freelist,
+                                                 queue->tx_skbs);
+                       queue->tx_skbs[id].skb = skb_get(skb);
+                       tx = RING_GET_REQUEST(&queue->tx, prod++);
                        tx->id = id;
-                       ref = gnttab_claim_grant_reference(&np->gref_tx_head);
+                       ref = 
gnttab_claim_grant_reference(&queue->gref_tx_head);
                        BUG_ON((signed short)ref < 0);
 
                        mfn = pfn_to_mfn(page_to_pfn(page));
                        gnttab_grant_foreign_access_ref(ref,
-                                                       np->xbdev->otherend_id,
+                                                       
queue->info->xbdev->otherend_id,
                                                        mfn, GNTMAP_readonly);
 
-                       np->grant_tx_page[id] = page;
-                       tx->gref = np->grant_tx_ref[id] = ref;
+                       queue->grant_tx_page[id] = page;
+                       tx->gref = queue->grant_tx_ref[id] = ref;
                        tx->offset = offset;
                        tx->size = bytes;
                        tx->flags = 0;
@@ -518,7 +539,7 @@ static void xennet_make_frags(struct sk_buff *skb, struct 
net_device *dev,
                }
        }
 
-       np->tx.req_prod_pvt = prod;
+       queue->tx.req_prod_pvt = prod;
 }
 
 /*
@@ -544,6 +565,12 @@ static int xennet_count_skb_frag_slots(struct sk_buff *skb)
        return pages;
 }
 
+static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb)
+{
+       /* Stub for later implementation of queue selection */
+       return 0;
+}
+
 static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
        unsigned short id;
@@ -559,6 +586,16 @@ static int xennet_start_xmit(struct sk_buff *skb, struct 
net_device *dev)
        unsigned int offset = offset_in_page(data);
        unsigned int len = skb_headlen(skb);
        unsigned long flags;
+       struct netfront_queue *queue = NULL;
+       unsigned int num_queues = dev->real_num_tx_queues;
+       u16 queue_index;
+
+       /* Drop the packet if no queues are set up */
+       if (num_queues < 1)
+               goto drop;
+       /* Determine which queue to transmit this SKB on */
+       queue_index = skb_get_queue_mapping(skb);
+       queue = &np->queues[queue_index];
 
        /* If skb->len is too big for wire format, drop skb and alert
         * user about misconfiguration.
@@ -578,30 +615,30 @@ static int xennet_start_xmit(struct sk_buff *skb, struct 
net_device *dev)
                goto drop;
        }
 
-       spin_lock_irqsave(&np->tx_lock, flags);
+       spin_lock_irqsave(&queue->tx_lock, flags);
 
        if (unlikely(!netif_carrier_ok(dev) ||
                     (slots > 1 && !xennet_can_sg(dev)) ||
                     netif_needs_gso(skb, netif_skb_features(skb)))) {
-               spin_unlock_irqrestore(&np->tx_lock, flags);
+               spin_unlock_irqrestore(&queue->tx_lock, flags);
                goto drop;
        }
 
-       i = np->tx.req_prod_pvt;
+       i = queue->tx.req_prod_pvt;
 
-       id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs);
-       np->tx_skbs[id].skb = skb;
+       id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs);
+       queue->tx_skbs[id].skb = skb;
 
-       tx = RING_GET_REQUEST(&np->tx, i);
+       tx = RING_GET_REQUEST(&queue->tx, i);
 
        tx->id   = id;
-       ref = gnttab_claim_grant_reference(&np->gref_tx_head);
+       ref = gnttab_claim_grant_reference(&queue->gref_tx_head);
        BUG_ON((signed short)ref < 0);
        mfn = virt_to_mfn(data);
        gnttab_grant_foreign_access_ref(
-               ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly);
-       np->grant_tx_page[id] = virt_to_page(data);
-       tx->gref = np->grant_tx_ref[id] = ref;
+               ref, queue->info->xbdev->otherend_id, mfn, GNTMAP_readonly);
+       queue->grant_tx_page[id] = virt_to_page(data);
+       tx->gref = queue->grant_tx_ref[id] = ref;
        tx->offset = offset;
        tx->size = len;
 
@@ -617,7 +654,7 @@ static int xennet_start_xmit(struct sk_buff *skb, struct 
net_device *dev)
                struct xen_netif_extra_info *gso;
 
                gso = (struct xen_netif_extra_info *)
-                       RING_GET_REQUEST(&np->tx, ++i);
+                       RING_GET_REQUEST(&queue->tx, ++i);
 
                tx->flags |= XEN_NETTXF_extra_info;
 
@@ -632,14 +669,14 @@ static int xennet_start_xmit(struct sk_buff *skb, struct 
net_device *dev)
                gso->flags = 0;
        }
 
-       np->tx.req_prod_pvt = i + 1;
+       queue->tx.req_prod_pvt = i + 1;
 
-       xennet_make_frags(skb, dev, tx);
+       xennet_make_frags(skb, queue, tx);
        tx->size = skb->len;
 
-       RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify);
+       RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify);
        if (notify)
-               notify_remote_via_irq(np->tx_irq);
+               notify_remote_via_irq(queue->tx_irq);
 
        u64_stats_update_begin(&stats->syncp);
        stats->tx_bytes += skb->len;
@@ -647,12 +684,12 @@ static int xennet_start_xmit(struct sk_buff *skb, struct 
net_device *dev)
        u64_stats_update_end(&stats->syncp);
 
        /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */
-       xennet_tx_buf_gc(dev);
+       xennet_tx_buf_gc(queue);
 
-       if (!netfront_tx_slot_available(np))
-               netif_stop_queue(dev);
+       if (!netfront_tx_slot_available(queue))
+               netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));
 
-       spin_unlock_irqrestore(&np->tx_lock, flags);
+       spin_unlock_irqrestore(&queue->tx_lock, flags);
 
        return NETDEV_TX_OK;
 
@@ -665,32 +702,38 @@ static int xennet_start_xmit(struct sk_buff *skb, struct 
net_device *dev)
 static int xennet_close(struct net_device *dev)
 {
        struct netfront_info *np = netdev_priv(dev);
-       netif_stop_queue(np->netdev);
-       napi_disable(&np->napi);
+       unsigned int num_queues = dev->real_num_tx_queues;
+       unsigned int i;
+       struct netfront_queue *queue;
+       netif_tx_stop_all_queues(np->netdev);
+       for (i = 0; i < num_queues; ++i) {
+               queue = &np->queues[i];
+               napi_disable(&queue->napi);
+       }
        return 0;
 }
 
-static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb,
+static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff 
*skb,
                                grant_ref_t ref)
 {
-       int new = xennet_rxidx(np->rx.req_prod_pvt);
-
-       BUG_ON(np->rx_skbs[new]);
-       np->rx_skbs[new] = skb;
-       np->grant_rx_ref[new] = ref;
-       RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new;
-       RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref;
-       np->rx.req_prod_pvt++;
+       int new = xennet_rxidx(queue->rx.req_prod_pvt);
+
+       BUG_ON(queue->rx_skbs[new]);
+       queue->rx_skbs[new] = skb;
+       queue->grant_rx_ref[new] = ref;
+       RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new;
+       RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref;
+       queue->rx.req_prod_pvt++;
 }
 
-static int xennet_get_extras(struct netfront_info *np,
+static int xennet_get_extras(struct netfront_queue *queue,
                             struct xen_netif_extra_info *extras,
                             RING_IDX rp)
 
 {
        struct xen_netif_extra_info *extra;
-       struct device *dev = &np->netdev->dev;
-       RING_IDX cons = np->rx.rsp_cons;
+       struct device *dev = &queue->info->netdev->dev;
+       RING_IDX cons = queue->rx.rsp_cons;
        int err = 0;
 
        do {
@@ -705,7 +748,7 @@ static int xennet_get_extras(struct netfront_info *np,
                }
 
                extra = (struct xen_netif_extra_info *)
-                       RING_GET_RESPONSE(&np->rx, ++cons);
+                       RING_GET_RESPONSE(&queue->rx, ++cons);
 
                if (unlikely(!extra->type ||
                             extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
@@ -718,33 +761,33 @@ static int xennet_get_extras(struct netfront_info *np,
                               sizeof(*extra));
                }
 
-               skb = xennet_get_rx_skb(np, cons);
-               ref = xennet_get_rx_ref(np, cons);
-               xennet_move_rx_slot(np, skb, ref);
+               skb = xennet_get_rx_skb(queue, cons);
+               ref = xennet_get_rx_ref(queue, cons);
+               xennet_move_rx_slot(queue, skb, ref);
        } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE);
 
-       np->rx.rsp_cons = cons;
+       queue->rx.rsp_cons = cons;
        return err;
 }
 
-static int xennet_get_responses(struct netfront_info *np,
+static int xennet_get_responses(struct netfront_queue *queue,
                                struct netfront_rx_info *rinfo, RING_IDX rp,
                                struct sk_buff_head *list)
 {
        struct xen_netif_rx_response *rx = &rinfo->rx;
        struct xen_netif_extra_info *extras = rinfo->extras;
-       struct device *dev = &np->netdev->dev;
-       RING_IDX cons = np->rx.rsp_cons;
-       struct sk_buff *skb = xennet_get_rx_skb(np, cons);
-       grant_ref_t ref = xennet_get_rx_ref(np, cons);
+       struct device *dev = &queue->info->netdev->dev;
+       RING_IDX cons = queue->rx.rsp_cons;
+       struct sk_buff *skb = xennet_get_rx_skb(queue, cons);
+       grant_ref_t ref = xennet_get_rx_ref(queue, cons);
        int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD);
        int slots = 1;
        int err = 0;
        unsigned long ret;
 
        if (rx->flags & XEN_NETRXF_extra_info) {
-               err = xennet_get_extras(np, extras, rp);
-               cons = np->rx.rsp_cons;
+               err = xennet_get_extras(queue, extras, rp);
+               cons = queue->rx.rsp_cons;
        }
 
        for (;;) {
@@ -753,7 +796,7 @@ static int xennet_get_responses(struct netfront_info *np,
                        if (net_ratelimit())
                                dev_warn(dev, "rx->offset: %x, size: %u\n",
                                         rx->offset, rx->status);
-                       xennet_move_rx_slot(np, skb, ref);
+                       xennet_move_rx_slot(queue, skb, ref);
                        err = -EINVAL;
                        goto next;
                }
@@ -774,7 +817,7 @@ static int xennet_get_responses(struct netfront_info *np,
                ret = gnttab_end_foreign_access_ref(ref, 0);
                BUG_ON(!ret);
 
-               gnttab_release_grant_reference(&np->gref_rx_head, ref);
+               gnttab_release_grant_reference(&queue->gref_rx_head, ref);
 
                __skb_queue_tail(list, skb);
 
@@ -789,9 +832,9 @@ next:
                        break;
                }
 
-               rx = RING_GET_RESPONSE(&np->rx, cons + slots);
-               skb = xennet_get_rx_skb(np, cons + slots);
-               ref = xennet_get_rx_ref(np, cons + slots);
+               rx = RING_GET_RESPONSE(&queue->rx, cons + slots);
+               skb = xennet_get_rx_skb(queue, cons + slots);
+               ref = xennet_get_rx_ref(queue, cons + slots);
                slots++;
        }
 
@@ -802,7 +845,7 @@ next:
        }
 
        if (unlikely(err))
-               np->rx.rsp_cons = cons + slots;
+               queue->rx.rsp_cons = cons + slots;
 
        return err;
 }
@@ -836,17 +879,17 @@ static int xennet_set_skb_gso(struct sk_buff *skb,
        return 0;
 }
 
-static RING_IDX xennet_fill_frags(struct netfront_info *np,
+static RING_IDX xennet_fill_frags(struct netfront_queue *queue,
                                  struct sk_buff *skb,
                                  struct sk_buff_head *list)
 {
        struct skb_shared_info *shinfo = skb_shinfo(skb);
-       RING_IDX cons = np->rx.rsp_cons;
+       RING_IDX cons = queue->rx.rsp_cons;
        struct sk_buff *nskb;
 
        while ((nskb = __skb_dequeue(list))) {
                struct xen_netif_rx_response *rx =
-                       RING_GET_RESPONSE(&np->rx, ++cons);
+                       RING_GET_RESPONSE(&queue->rx, ++cons);
                skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0];
 
                if (shinfo->nr_frags == MAX_SKB_FRAGS) {
@@ -879,7 +922,7 @@ static int checksum_setup(struct net_device *dev, struct 
sk_buff *skb)
         */
        if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) {
                struct netfront_info *np = netdev_priv(dev);
-               np->rx_gso_checksum_fixup++;
+               atomic_inc(&np->rx_gso_checksum_fixup);
                skb->ip_summed = CHECKSUM_PARTIAL;
                recalculate_partial_csum = true;
        }
@@ -891,11 +934,10 @@ static int checksum_setup(struct net_device *dev, struct 
sk_buff *skb)
        return skb_checksum_setup(skb, recalculate_partial_csum);
 }
 
-static int handle_incoming_queue(struct net_device *dev,
+static int handle_incoming_queue(struct netfront_queue *queue,
                                 struct sk_buff_head *rxq)
 {
-       struct netfront_info *np = netdev_priv(dev);
-       struct netfront_stats *stats = this_cpu_ptr(np->stats);
+       struct netfront_stats *stats = this_cpu_ptr(queue->info->stats);
        int packets_dropped = 0;
        struct sk_buff *skb;
 
@@ -906,13 +948,13 @@ static int handle_incoming_queue(struct net_device *dev,
                        __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
 
                /* Ethernet work: Delayed to here as it peeks the header. */
-               skb->protocol = eth_type_trans(skb, dev);
+               skb->protocol = eth_type_trans(skb, queue->info->netdev);
                skb_reset_network_header(skb);
 
-               if (checksum_setup(dev, skb)) {
+               if (checksum_setup(queue->info->netdev, skb)) {
                        kfree_skb(skb);
                        packets_dropped++;
-                       dev->stats.rx_errors++;
+                       queue->info->netdev->stats.rx_errors++;
                        continue;
                }
 
@@ -922,7 +964,7 @@ static int handle_incoming_queue(struct net_device *dev,
                u64_stats_update_end(&stats->syncp);
 
                /* Pass it up. */
-               napi_gro_receive(&np->napi, skb);
+               napi_gro_receive(&queue->napi, skb);
        }
 
        return packets_dropped;
@@ -930,8 +972,8 @@ static int handle_incoming_queue(struct net_device *dev,
 
 static int xennet_poll(struct napi_struct *napi, int budget)
 {
-       struct netfront_info *np = container_of(napi, struct netfront_info, 
napi);
-       struct net_device *dev = np->netdev;
+       struct netfront_queue *queue = container_of(napi, struct 
netfront_queue, napi);
+       struct net_device *dev = queue->info->netdev;
        struct sk_buff *skb;
        struct netfront_rx_info rinfo;
        struct xen_netif_rx_response *rx = &rinfo.rx;
@@ -944,29 +986,29 @@ static int xennet_poll(struct napi_struct *napi, int 
budget)
        unsigned long flags;
        int err;
 
-       spin_lock(&np->rx_lock);
+       spin_lock(&queue->rx_lock);
 
        skb_queue_head_init(&rxq);
        skb_queue_head_init(&errq);
        skb_queue_head_init(&tmpq);
 
-       rp = np->rx.sring->rsp_prod;
+       rp = queue->rx.sring->rsp_prod;
        rmb(); /* Ensure we see queued responses up to 'rp'. */
 
-       i = np->rx.rsp_cons;
+       i = queue->rx.rsp_cons;
        work_done = 0;
        while ((i != rp) && (work_done < budget)) {
-               memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx));
+               memcpy(rx, RING_GET_RESPONSE(&queue->rx, i), sizeof(*rx));
                memset(extras, 0, sizeof(rinfo.extras));
 
-               err = xennet_get_responses(np, &rinfo, rp, &tmpq);
+               err = xennet_get_responses(queue, &rinfo, rp, &tmpq);
 
                if (unlikely(err)) {
 err:
                        while ((skb = __skb_dequeue(&tmpq)))
                                __skb_queue_tail(&errq, skb);
                        dev->stats.rx_errors++;
-                       i = np->rx.rsp_cons;
+                       i = queue->rx.rsp_cons;
                        continue;
                }
 
@@ -978,7 +1020,7 @@ err:
 
                        if (unlikely(xennet_set_skb_gso(skb, gso))) {
                                __skb_queue_head(&tmpq, skb);
-                               np->rx.rsp_cons += skb_queue_len(&tmpq);
+                               queue->rx.rsp_cons += skb_queue_len(&tmpq);
                                goto err;
                        }
                }
@@ -992,7 +1034,7 @@ err:
                skb->data_len = rx->status;
                skb->len += rx->status;
 
-               i = xennet_fill_frags(np, skb, &tmpq);
+               i = xennet_fill_frags(queue, skb, &tmpq);
 
                if (rx->flags & XEN_NETRXF_csum_blank)
                        skb->ip_summed = CHECKSUM_PARTIAL;
@@ -1001,22 +1043,22 @@ err:
 
                __skb_queue_tail(&rxq, skb);
 
-               np->rx.rsp_cons = ++i;
+               queue->rx.rsp_cons = ++i;
                work_done++;
        }
 
        __skb_queue_purge(&errq);
 
-       work_done -= handle_incoming_queue(dev, &rxq);
+       work_done -= handle_incoming_queue(queue, &rxq);
 
        /* If we get a callback with very few responses, reduce fill target. */
        /* NB. Note exponential increase, linear decrease. */
-       if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) >
-            ((3*np->rx_target) / 4)) &&
-           (--np->rx_target < np->rx_min_target))
-               np->rx_target = np->rx_min_target;
+       if (((queue->rx.req_prod_pvt - queue->rx.sring->rsp_prod) >
+            ((3*queue->rx_target) / 4)) &&
+           (--queue->rx_target < queue->rx_min_target))
+               queue->rx_target = queue->rx_min_target;
 
-       xennet_alloc_rx_buffers(dev);
+       xennet_alloc_rx_buffers(queue);
 
        if (work_done < budget) {
                int more_to_do = 0;
@@ -1025,14 +1067,14 @@ err:
 
                local_irq_save(flags);
 
-               RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do);
+               RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do);
                if (!more_to_do)
                        __napi_complete(napi);
 
                local_irq_restore(flags);
        }
 
-       spin_unlock(&np->rx_lock);
+       spin_unlock(&queue->rx_lock);
 
        return work_done;
 }
@@ -1080,43 +1122,43 @@ static struct rtnl_link_stats64 
*xennet_get_stats64(struct net_device *dev,
        return tot;
 }
 
-static void xennet_release_tx_bufs(struct netfront_info *np)
+static void xennet_release_tx_bufs(struct netfront_queue *queue)
 {
        struct sk_buff *skb;
        int i;
 
        for (i = 0; i < NET_TX_RING_SIZE; i++) {
                /* Skip over entries which are actually freelist references */
-               if (skb_entry_is_link(&np->tx_skbs[i]))
+               if (skb_entry_is_link(&queue->tx_skbs[i]))
                        continue;
 
-               skb = np->tx_skbs[i].skb;
-               get_page(np->grant_tx_page[i]);
-               gnttab_end_foreign_access(np->grant_tx_ref[i],
+               skb = queue->tx_skbs[i].skb;
+               get_page(queue->grant_tx_page[i]);
+               gnttab_end_foreign_access(queue->grant_tx_ref[i],
                                          GNTMAP_readonly,
-                                         (unsigned 
long)page_address(np->grant_tx_page[i]));
-               np->grant_tx_page[i] = NULL;
-               np->grant_tx_ref[i] = GRANT_INVALID_REF;
-               add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i);
+                                         (unsigned 
long)page_address(queue->grant_tx_page[i]));
+               queue->grant_tx_page[i] = NULL;
+               queue->grant_tx_ref[i] = GRANT_INVALID_REF;
+               add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, i);
                dev_kfree_skb_irq(skb);
        }
 }
 
-static void xennet_release_rx_bufs(struct netfront_info *np)
+static void xennet_release_rx_bufs(struct netfront_queue *queue)
 {
        int id, ref;
 
-       spin_lock_bh(&np->rx_lock);
+       spin_lock_bh(&queue->rx_lock);
 
        for (id = 0; id < NET_RX_RING_SIZE; id++) {
                struct sk_buff *skb;
                struct page *page;
 
-               skb = np->rx_skbs[id];
+               skb = queue->rx_skbs[id];
                if (!skb)
                        continue;
 
-               ref = np->grant_rx_ref[id];
+               ref = queue->grant_rx_ref[id];
                if (ref == GRANT_INVALID_REF)
                        continue;
 
@@ -1128,21 +1170,28 @@ static void xennet_release_rx_bufs(struct netfront_info 
*np)
                get_page(page);
                gnttab_end_foreign_access(ref, 0,
                                          (unsigned long)page_address(page));
-               np->grant_rx_ref[id] = GRANT_INVALID_REF;
+               queue->grant_rx_ref[id] = GRANT_INVALID_REF;
 
                kfree_skb(skb);
        }
 
-       spin_unlock_bh(&np->rx_lock);
+       spin_unlock_bh(&queue->rx_lock);
 }
 
 static void xennet_uninit(struct net_device *dev)
 {
        struct netfront_info *np = netdev_priv(dev);
-       xennet_release_tx_bufs(np);
-       xennet_release_rx_bufs(np);
-       gnttab_free_grant_references(np->gref_tx_head);
-       gnttab_free_grant_references(np->gref_rx_head);
+       unsigned int num_queues = dev->real_num_tx_queues;
+       struct netfront_queue *queue;
+       unsigned int i;
+
+       for (i = 0; i < num_queues; ++i) {
+               queue = &np->queues[i];
+               xennet_release_tx_bufs(queue);
+               xennet_release_rx_bufs(queue);
+               gnttab_free_grant_references(queue->gref_tx_head);
+               gnttab_free_grant_references(queue->gref_rx_head);
+       }
 }
 
 static netdev_features_t xennet_fix_features(struct net_device *dev,
@@ -1203,25 +1252,24 @@ static int xennet_set_features(struct net_device *dev,
 
 static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id)
 {
-       struct netfront_info *np = dev_id;
-       struct net_device *dev = np->netdev;
+       struct netfront_queue *queue = dev_id;
        unsigned long flags;
 
-       spin_lock_irqsave(&np->tx_lock, flags);
-       xennet_tx_buf_gc(dev);
-       spin_unlock_irqrestore(&np->tx_lock, flags);
+       spin_lock_irqsave(&queue->tx_lock, flags);
+       xennet_tx_buf_gc(queue);
+       spin_unlock_irqrestore(&queue->tx_lock, flags);
 
        return IRQ_HANDLED;
 }
 
 static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id)
 {
-       struct netfront_info *np = dev_id;
-       struct net_device *dev = np->netdev;
+       struct netfront_queue *queue = dev_id;
+       struct net_device *dev = queue->info->netdev;
 
        if (likely(netif_carrier_ok(dev) &&
-                  RING_HAS_UNCONSUMED_RESPONSES(&np->rx)))
-                       napi_schedule(&np->napi);
+                  RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)))
+                       napi_schedule(&queue->napi);
 
        return IRQ_HANDLED;
 }
@@ -1236,7 +1284,12 @@ static irqreturn_t xennet_interrupt(int irq, void 
*dev_id)
 #ifdef CONFIG_NET_POLL_CONTROLLER
 static void xennet_poll_controller(struct net_device *dev)
 {
-       xennet_interrupt(0, dev);
+       /* Poll each queue */
+       struct netfront_info *info = netdev_priv(dev);
+       unsigned int num_queues = dev->real_num_tx_queues;
+       unsigned int i;
+       for (i = 0; i < num_queues; ++i)
+               xennet_interrupt(0, &info->queues[i]);
 }
 #endif
 
@@ -1251,6 +1304,7 @@ static const struct net_device_ops xennet_netdev_ops = {
        .ndo_validate_addr   = eth_validate_addr,
        .ndo_fix_features    = xennet_fix_features,
        .ndo_set_features    = xennet_set_features,
+       .ndo_select_queue    = xennet_select_queue,
 #ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller = xennet_poll_controller,
 #endif
@@ -1258,66 +1312,30 @@ static const struct net_device_ops xennet_netdev_ops = {
 
 static struct net_device *xennet_create_dev(struct xenbus_device *dev)
 {
-       int i, err;
+       int err;
        struct net_device *netdev;
        struct netfront_info *np;
 
-       netdev = alloc_etherdev(sizeof(struct netfront_info));
+       netdev = alloc_etherdev_mq(sizeof(struct netfront_info), 1);
        if (!netdev)
                return ERR_PTR(-ENOMEM);
 
        np                   = netdev_priv(netdev);
        np->xbdev            = dev;
 
-       spin_lock_init(&np->tx_lock);
-       spin_lock_init(&np->rx_lock);
-
-       skb_queue_head_init(&np->rx_batch);
-       np->rx_target     = RX_DFL_MIN_TARGET;
-       np->rx_min_target = RX_DFL_MIN_TARGET;
-       np->rx_max_target = RX_MAX_TARGET;
-
-       init_timer(&np->rx_refill_timer);
-       np->rx_refill_timer.data = (unsigned long)netdev;
-       np->rx_refill_timer.function = rx_refill_timeout;
+       /* No need to use rtnl_lock() before the call below as it
+        * happens before register_netdev().
+        */
+       netif_set_real_num_tx_queues(netdev, 0);
+       np->queues = NULL;
 
        err = -ENOMEM;
        np->stats = netdev_alloc_pcpu_stats(struct netfront_stats);
        if (np->stats == NULL)
                goto exit;
 
-       /* Initialise tx_skbs as a free chain containing every entry. */
-       np->tx_skb_freelist = 0;
-       for (i = 0; i < NET_TX_RING_SIZE; i++) {
-               skb_entry_set_link(&np->tx_skbs[i], i+1);
-               np->grant_tx_ref[i] = GRANT_INVALID_REF;
-               np->grant_tx_page[i] = NULL;
-       }
-
-       /* Clear out rx_skbs */
-       for (i = 0; i < NET_RX_RING_SIZE; i++) {
-               np->rx_skbs[i] = NULL;
-               np->grant_rx_ref[i] = GRANT_INVALID_REF;
-       }
-
-       /* A grant for every tx ring slot */
-       if (gnttab_alloc_grant_references(TX_MAX_TARGET,
-                                         &np->gref_tx_head) < 0) {
-               pr_alert("can't alloc tx grant refs\n");
-               err = -ENOMEM;
-               goto exit_free_stats;
-       }
-       /* A grant for every rx ring slot */
-       if (gnttab_alloc_grant_references(RX_MAX_TARGET,
-                                         &np->gref_rx_head) < 0) {
-               pr_alert("can't alloc rx grant refs\n");
-               err = -ENOMEM;
-               goto exit_free_tx;
-       }
-
        netdev->netdev_ops      = &xennet_netdev_ops;
 
-       netif_napi_add(netdev, &np->napi, xennet_poll, 64);
        netdev->features        = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
                                  NETIF_F_GSO_ROBUST;
        netdev->hw_features     = NETIF_F_SG |
@@ -1343,10 +1361,6 @@ static struct net_device *xennet_create_dev(struct 
xenbus_device *dev)
 
        return netdev;
 
- exit_free_tx:
-       gnttab_free_grant_references(np->gref_tx_head);
- exit_free_stats:
-       free_percpu(np->stats);
  exit:
        free_netdev(netdev);
        return ERR_PTR(err);
@@ -1404,30 +1418,36 @@ static void xennet_end_access(int ref, void *page)
 
 static void xennet_disconnect_backend(struct netfront_info *info)
 {
-       /* Stop old i/f to prevent errors whilst we rebuild the state. */
-       spin_lock_bh(&info->rx_lock);
-       spin_lock_irq(&info->tx_lock);
-       netif_carrier_off(info->netdev);
-       spin_unlock_irq(&info->tx_lock);
-       spin_unlock_bh(&info->rx_lock);
-
-       if (info->tx_irq && (info->tx_irq == info->rx_irq))
-               unbind_from_irqhandler(info->tx_irq, info);
-       if (info->tx_irq && (info->tx_irq != info->rx_irq)) {
-               unbind_from_irqhandler(info->tx_irq, info);
-               unbind_from_irqhandler(info->rx_irq, info);
-       }
-       info->tx_evtchn = info->rx_evtchn = 0;
-       info->tx_irq = info->rx_irq = 0;
+       unsigned int i = 0;
+       struct netfront_queue *queue = NULL;
+       unsigned int num_queues = info->netdev->real_num_tx_queues;
+
+       for (i = 0; i < num_queues; ++i) {
+               /* Stop old i/f to prevent errors whilst we rebuild the state. 
*/
+               spin_lock_bh(&queue->rx_lock);
+               spin_lock_irq(&queue->tx_lock);
+               netif_carrier_off(queue->info->netdev);
+               spin_unlock_irq(&queue->tx_lock);
+               spin_unlock_bh(&queue->rx_lock);
+
+               if (queue->tx_irq && (queue->tx_irq == queue->rx_irq))
+                       unbind_from_irqhandler(queue->tx_irq, queue);
+               if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) {
+                       unbind_from_irqhandler(queue->tx_irq, queue);
+                       unbind_from_irqhandler(queue->rx_irq, queue);
+               }
+               queue->tx_evtchn = queue->rx_evtchn = 0;
+               queue->tx_irq = queue->rx_irq = 0;
 
-       /* End access and free the pages */
-       xennet_end_access(info->tx_ring_ref, info->tx.sring);
-       xennet_end_access(info->rx_ring_ref, info->rx.sring);
+               /* End access and free the pages */
+               xennet_end_access(queue->tx_ring_ref, queue->tx.sring);
+               xennet_end_access(queue->rx_ring_ref, queue->rx.sring);
 
-       info->tx_ring_ref = GRANT_INVALID_REF;
-       info->rx_ring_ref = GRANT_INVALID_REF;
-       info->tx.sring = NULL;
-       info->rx.sring = NULL;
+               queue->tx_ring_ref = GRANT_INVALID_REF;
+               queue->rx_ring_ref = GRANT_INVALID_REF;
+               queue->tx.sring = NULL;
+               queue->rx.sring = NULL;
+       }
 }
 
 /**
@@ -1468,100 +1488,86 @@ static int xen_net_read_mac(struct xenbus_device *dev, 
u8 mac[])
        return 0;
 }
 
-static int setup_netfront_single(struct netfront_info *info)
+static int setup_netfront_single(struct netfront_queue *queue)
 {
        int err;
 
-       err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn);
+       err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn);
        if (err < 0)
                goto fail;
 
-       err = bind_evtchn_to_irqhandler(info->tx_evtchn,
+       err = bind_evtchn_to_irqhandler(queue->tx_evtchn,
                                        xennet_interrupt,
-                                       0, info->netdev->name, info);
+                                       0, queue->info->netdev->name, queue);
        if (err < 0)
                goto bind_fail;
-       info->rx_evtchn = info->tx_evtchn;
-       info->rx_irq = info->tx_irq = err;
+       queue->rx_evtchn = queue->tx_evtchn;
+       queue->rx_irq = queue->tx_irq = err;
 
        return 0;
 
 bind_fail:
-       xenbus_free_evtchn(info->xbdev, info->tx_evtchn);
-       info->tx_evtchn = 0;
+       xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn);
+       queue->tx_evtchn = 0;
 fail:
        return err;
 }
 
-static int setup_netfront_split(struct netfront_info *info)
+static int setup_netfront_split(struct netfront_queue *queue)
 {
        int err;
 
-       err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn);
+       err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn);
        if (err < 0)
                goto fail;
-       err = xenbus_alloc_evtchn(info->xbdev, &info->rx_evtchn);
+       err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn);
        if (err < 0)
                goto alloc_rx_evtchn_fail;
 
-       snprintf(info->tx_irq_name, sizeof(info->tx_irq_name),
-                "%s-tx", info->netdev->name);
-       err = bind_evtchn_to_irqhandler(info->tx_evtchn,
+       snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),
+                "%s-tx", queue->name);
+       err = bind_evtchn_to_irqhandler(queue->tx_evtchn,
                                        xennet_tx_interrupt,
-                                       0, info->tx_irq_name, info);
+                                       0, queue->tx_irq_name, queue);
        if (err < 0)
                goto bind_tx_fail;
-       info->tx_irq = err;
+       queue->tx_irq = err;
 
-       snprintf(info->rx_irq_name, sizeof(info->rx_irq_name),
-                "%s-rx", info->netdev->name);
-       err = bind_evtchn_to_irqhandler(info->rx_evtchn,
+       snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),
+                "%s-rx", queue->name);
+       err = bind_evtchn_to_irqhandler(queue->rx_evtchn,
                                        xennet_rx_interrupt,
-                                       0, info->rx_irq_name, info);
+                                       0, queue->rx_irq_name, queue);
        if (err < 0)
                goto bind_rx_fail;
-       info->rx_irq = err;
+       queue->rx_irq = err;
 
        return 0;
 
 bind_rx_fail:
-       unbind_from_irqhandler(info->tx_irq, info);
-       info->tx_irq = 0;
+       unbind_from_irqhandler(queue->tx_irq, queue);
+       queue->tx_irq = 0;
 bind_tx_fail:
-       xenbus_free_evtchn(info->xbdev, info->rx_evtchn);
-       info->rx_evtchn = 0;
+       xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn);
+       queue->rx_evtchn = 0;
 alloc_rx_evtchn_fail:
-       xenbus_free_evtchn(info->xbdev, info->tx_evtchn);
-       info->tx_evtchn = 0;
+       xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn);
+       queue->tx_evtchn = 0;
 fail:
        return err;
 }
 
-static int setup_netfront(struct xenbus_device *dev, struct netfront_info 
*info)
+static int setup_netfront(struct xenbus_device *dev,
+                       struct netfront_queue *queue, unsigned int 
feature_split_evtchn)
 {
        struct xen_netif_tx_sring *txs;
        struct xen_netif_rx_sring *rxs;
        int err;
-       struct net_device *netdev = info->netdev;
-       unsigned int feature_split_evtchn;
 
-       info->tx_ring_ref = GRANT_INVALID_REF;
-       info->rx_ring_ref = GRANT_INVALID_REF;
-       info->rx.sring = NULL;
-       info->tx.sring = NULL;
-       netdev->irq = 0;
-
-       err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
-                          "feature-split-event-channels", "%u",
-                          &feature_split_evtchn);
-       if (err < 0)
-               feature_split_evtchn = 0;
-
-       err = xen_net_read_mac(dev, netdev->dev_addr);
-       if (err) {
-               xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
-               goto fail;
-       }
+       queue->tx_ring_ref = GRANT_INVALID_REF;
+       queue->rx_ring_ref = GRANT_INVALID_REF;
+       queue->rx.sring = NULL;
+       queue->tx.sring = NULL;
 
        txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | 
__GFP_HIGH);
        if (!txs) {
@@ -1570,13 +1576,13 @@ static int setup_netfront(struct xenbus_device *dev, 
struct netfront_info *info)
                goto fail;
        }
        SHARED_RING_INIT(txs);
-       FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE);
+       FRONT_RING_INIT(&queue->tx, txs, PAGE_SIZE);
 
        err = xenbus_grant_ring(dev, virt_to_mfn(txs));
        if (err < 0)
                goto grant_tx_ring_fail;
+       queue->tx_ring_ref = err;
 
-       info->tx_ring_ref = err;
        rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | 
__GFP_HIGH);
        if (!rxs) {
                err = -ENOMEM;
@@ -1584,21 +1590,21 @@ static int setup_netfront(struct xenbus_device *dev, 
struct netfront_info *info)
                goto alloc_rx_ring_fail;
        }
        SHARED_RING_INIT(rxs);
-       FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE);
+       FRONT_RING_INIT(&queue->rx, rxs, PAGE_SIZE);
 
        err = xenbus_grant_ring(dev, virt_to_mfn(rxs));
        if (err < 0)
                goto grant_rx_ring_fail;
-       info->rx_ring_ref = err;
+       queue->rx_ring_ref = err;
 
        if (feature_split_evtchn)
-               err = setup_netfront_split(info);
+               err = setup_netfront_split(queue);
        /* setup single event channel if
         *  a) feature-split-event-channels == 0
         *  b) feature-split-event-channels == 1 but failed to setup
         */
        if (!feature_split_evtchn || (feature_split_evtchn && err))
-               err = setup_netfront_single(info);
+               err = setup_netfront_single(queue);
 
        if (err)
                goto alloc_evtchn_fail;
@@ -1609,17 +1615,78 @@ static int setup_netfront(struct xenbus_device *dev, 
struct netfront_info *info)
         * granted pages because backend is not accessing it at this point.
         */
 alloc_evtchn_fail:
-       gnttab_end_foreign_access_ref(info->rx_ring_ref, 0);
+       gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0);
 grant_rx_ring_fail:
        free_page((unsigned long)rxs);
 alloc_rx_ring_fail:
-       gnttab_end_foreign_access_ref(info->tx_ring_ref, 0);
+       gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0);
 grant_tx_ring_fail:
        free_page((unsigned long)txs);
 fail:
        return err;
 }
 
+/* Queue-specific initialisation
+ * This used to be done in xennet_create_dev() but must now
+ * be run per-queue.
+ */
+static int xennet_init_queue(struct netfront_queue *queue)
+{
+       unsigned short i;
+       int err = 0;
+
+       spin_lock_init(&queue->tx_lock);
+       spin_lock_init(&queue->rx_lock);
+
+       skb_queue_head_init(&queue->rx_batch);
+       queue->rx_target     = RX_DFL_MIN_TARGET;
+       queue->rx_min_target = RX_DFL_MIN_TARGET;
+       queue->rx_max_target = RX_MAX_TARGET;
+
+       init_timer(&queue->rx_refill_timer);
+       queue->rx_refill_timer.data = (unsigned long)queue;
+       queue->rx_refill_timer.function = rx_refill_timeout;
+
+       /* Initialise tx_skbs as a free chain containing every entry. */
+       queue->tx_skb_freelist = 0;
+       for (i = 0; i < NET_TX_RING_SIZE; i++) {
+               skb_entry_set_link(&queue->tx_skbs[i], i+1);
+               queue->grant_tx_ref[i] = GRANT_INVALID_REF;
+               queue->grant_tx_page[i] = NULL;
+       }
+
+       /* Clear out rx_skbs */
+       for (i = 0; i < NET_RX_RING_SIZE; i++) {
+               queue->rx_skbs[i] = NULL;
+               queue->grant_rx_ref[i] = GRANT_INVALID_REF;
+       }
+
+       /* A grant for every tx ring slot */
+       if (gnttab_alloc_grant_references(TX_MAX_TARGET,
+                                         &queue->gref_tx_head) < 0) {
+               pr_alert("can't alloc tx grant refs\n");
+               err = -ENOMEM;
+               goto exit;
+       }
+
+       /* A grant for every rx ring slot */
+       if (gnttab_alloc_grant_references(RX_MAX_TARGET,
+                                         &queue->gref_rx_head) < 0) {
+               pr_alert("can't alloc rx grant refs\n");
+               err = -ENOMEM;
+               goto exit_free_tx;
+       }
+
+       netif_napi_add(queue->info->netdev, &queue->napi, xennet_poll, 64);
+
+       return 0;
+
+ exit_free_tx:
+       gnttab_free_grant_references(queue->gref_tx_head);
+ exit:
+       return err;
+}
+
 /* Common code used when first setting up, and when resuming. */
 static int talk_to_netback(struct xenbus_device *dev,
                           struct netfront_info *info)
@@ -1627,13 +1694,79 @@ static int talk_to_netback(struct xenbus_device *dev,
        const char *message;
        struct xenbus_transaction xbt;
        int err;
+       unsigned int feature_split_evtchn;
+       unsigned int i = 0;
+       struct netfront_queue *queue = NULL;
+       unsigned int num_queues = 1;
 
-       /* Create shared ring, alloc event channel. */
-       err = setup_netfront(dev, info);
-       if (err)
+       info->netdev->irq = 0;
+
+       /* Check feature-split-event-channels */
+       err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+                          "feature-split-event-channels", "%u",
+                          &feature_split_evtchn);
+       if (err < 0)
+               feature_split_evtchn = 0;
+
+       /* Read mac addr. */
+       err = xen_net_read_mac(dev, info->netdev->dev_addr);
+       if (err) {
+               xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
+               goto out;
+       }
+
+       /* Allocate array of queues */
+       info->queues = kcalloc(num_queues, sizeof(struct netfront_queue), 
GFP_KERNEL);
+       if (!info->queues) {
+               err = -ENOMEM;
                goto out;
+       }
+       rtnl_lock();
+       netif_set_real_num_tx_queues(info->netdev, num_queues);
+       rtnl_unlock();
+
+       /* Create shared ring, alloc event channel -- for each queue */
+       for (i = 0; i < num_queues; ++i) {
+               queue = &info->queues[i];
+               queue->id = i;
+               queue->info = info;
+               err = xennet_init_queue(queue);
+               if (err) {
+                       /* xennet_init_queue() cleans up after itself on 
failure,
+                        * but we still have to clean up any previously 
initialised
+                        * queues. If i > 0, set num_queues to i, then goto
+                        * destroy_ring, which calls xennet_disconnect_backend()
+                        * to tidy up.
+                        */
+                       if (i > 0) {
+                               rtnl_lock();
+                               netif_set_real_num_tx_queues(info->netdev, i);
+                               rtnl_unlock();
+                               goto destroy_ring;
+                       } else {
+                               goto out;
+                       }
+               }
+               err = setup_netfront(dev, queue, feature_split_evtchn);
+               if (err) {
+                       /* As for xennet_init_queue(), setup_netfront() will 
tidy
+                        * up the current queue on error, but we need to clean 
up
+                        * those already allocated.
+                        */
+                       if (i > 0) {
+                               rtnl_lock();
+                               netif_set_real_num_tx_queues(info->netdev, i);
+                               rtnl_unlock();
+                               goto destroy_ring;
+                       } else {
+                               goto out;
+                       }
+               }
+       }
 
 again:
+       queue = &info->queues[0]; /* Use first queue only */
+
        err = xenbus_transaction_start(&xbt);
        if (err) {
                xenbus_dev_fatal(dev, err, "starting transaction");
@@ -1641,34 +1774,34 @@ again:
        }
 
        err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u",
-                           info->tx_ring_ref);
+                           queue->tx_ring_ref);
        if (err) {
                message = "writing tx ring-ref";
                goto abort_transaction;
        }
        err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u",
-                           info->rx_ring_ref);
+                           queue->rx_ring_ref);
        if (err) {
                message = "writing rx ring-ref";
                goto abort_transaction;
        }
 
-       if (info->tx_evtchn == info->rx_evtchn) {
+       if (queue->tx_evtchn == queue->rx_evtchn) {
                err = xenbus_printf(xbt, dev->nodename,
-                                   "event-channel", "%u", info->tx_evtchn);
+                                   "event-channel", "%u", queue->tx_evtchn);
                if (err) {
                        message = "writing event-channel";
                        goto abort_transaction;
                }
        } else {
                err = xenbus_printf(xbt, dev->nodename,
-                                   "event-channel-tx", "%u", info->tx_evtchn);
+                                   "event-channel-tx", "%u", queue->tx_evtchn);
                if (err) {
                        message = "writing event-channel-tx";
                        goto abort_transaction;
                }
                err = xenbus_printf(xbt, dev->nodename,
-                                   "event-channel-rx", "%u", info->rx_evtchn);
+                                   "event-channel-rx", "%u", queue->rx_evtchn);
                if (err) {
                        message = "writing event-channel-rx";
                        goto abort_transaction;
@@ -1728,6 +1861,11 @@ again:
        xenbus_dev_fatal(dev, err, "%s", message);
  destroy_ring:
        xennet_disconnect_backend(info);
+       kfree(info->queues);
+       info->queues = NULL;
+       rtnl_lock();
+       netif_set_real_num_tx_queues(info->netdev, 0);
+       rtnl_lock();
  out:
        return err;
 }
@@ -1735,11 +1873,14 @@ again:
 static int xennet_connect(struct net_device *dev)
 {
        struct netfront_info *np = netdev_priv(dev);
+       unsigned int num_queues = 0;
        int i, requeue_idx, err;
        struct sk_buff *skb;
        grant_ref_t ref;
        struct xen_netif_rx_request *req;
        unsigned int feature_rx_copy;
+       unsigned int j = 0;
+       struct netfront_queue *queue = NULL;
 
        err = xenbus_scanf(XBT_NIL, np->xbdev->otherend,
                           "feature-rx-copy", "%u", &feature_rx_copy);
@@ -1756,40 +1897,47 @@ static int xennet_connect(struct net_device *dev)
        if (err)
                return err;
 
+       /* talk_to_netback() sets the correct number of queues */
+       num_queues = dev->real_num_tx_queues;
+
        rtnl_lock();
        netdev_update_features(dev);
        rtnl_unlock();
 
-       spin_lock_bh(&np->rx_lock);
-       spin_lock_irq(&np->tx_lock);
+       /* By now, the queue structures have been set up */
+       for (j = 0; j < num_queues; ++j) {
+               queue = &np->queues[j];
+               spin_lock_bh(&queue->rx_lock);
+               spin_lock_irq(&queue->tx_lock);
 
-       /* Step 1: Discard all pending TX packet fragments. */
-       xennet_release_tx_bufs(np);
+               /* Step 1: Discard all pending TX packet fragments. */
+               xennet_release_tx_bufs(queue);
 
-       /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */
-       for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) {
-               skb_frag_t *frag;
-               const struct page *page;
-               if (!np->rx_skbs[i])
-                       continue;
+               /* Step 2: Rebuild the RX buffer freelist and the RX ring 
itself. */
+               for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) {
+                       skb_frag_t *frag;
+                       const struct page *page;
+                       if (!queue->rx_skbs[i])
+                               continue;
 
-               skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i);
-               ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i);
-               req = RING_GET_REQUEST(&np->rx, requeue_idx);
+                       skb = queue->rx_skbs[requeue_idx] = 
xennet_get_rx_skb(queue, i);
+                       ref = queue->grant_rx_ref[requeue_idx] = 
xennet_get_rx_ref(queue, i);
+                       req = RING_GET_REQUEST(&queue->rx, requeue_idx);
 
-               frag = &skb_shinfo(skb)->frags[0];
-               page = skb_frag_page(frag);
-               gnttab_grant_foreign_access_ref(
-                       ref, np->xbdev->otherend_id,
-                       pfn_to_mfn(page_to_pfn(page)),
-                       0);
-               req->gref = ref;
-               req->id   = requeue_idx;
+                       frag = &skb_shinfo(skb)->frags[0];
+                       page = skb_frag_page(frag);
+                       gnttab_grant_foreign_access_ref(
+                               ref, queue->info->xbdev->otherend_id,
+                               pfn_to_mfn(page_to_pfn(page)),
+                               0);
+                       req->gref = ref;
+                       req->id   = requeue_idx;
 
-               requeue_idx++;
-       }
+                       requeue_idx++;
+               }
 
-       np->rx.req_prod_pvt = requeue_idx;
+               queue->rx.req_prod_pvt = requeue_idx;
+       }
 
        /*
         * Step 3: All public and private state should now be sane.  Get
@@ -1798,14 +1946,17 @@ static int xennet_connect(struct net_device *dev)
         * packets.
         */
        netif_carrier_on(np->netdev);
-       notify_remote_via_irq(np->tx_irq);
-       if (np->tx_irq != np->rx_irq)
-               notify_remote_via_irq(np->rx_irq);
-       xennet_tx_buf_gc(dev);
-       xennet_alloc_rx_buffers(dev);
-
-       spin_unlock_irq(&np->tx_lock);
-       spin_unlock_bh(&np->rx_lock);
+       for (j = 0; j < num_queues; ++j) {
+               queue = &np->queues[j];
+               notify_remote_via_irq(queue->tx_irq);
+               if (queue->tx_irq != queue->rx_irq)
+                       notify_remote_via_irq(queue->rx_irq);
+               xennet_tx_buf_gc(queue);
+               xennet_alloc_rx_buffers(queue);
+
+               spin_unlock_irq(&queue->tx_lock);
+               spin_unlock_bh(&queue->rx_lock);
+       }
 
        return 0;
 }
@@ -1878,7 +2029,7 @@ static void xennet_get_ethtool_stats(struct net_device 
*dev,
        int i;
 
        for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
-               data[i] = *(unsigned long *)(np + xennet_stats[i].offset);
+               data[i] = atomic_read((atomic_t *)(np + 
xennet_stats[i].offset));
 }
 
 static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * 
data)
@@ -1909,8 +2060,12 @@ static ssize_t show_rxbuf_min(struct device *dev,
 {
        struct net_device *netdev = to_net_dev(dev);
        struct netfront_info *info = netdev_priv(netdev);
+       unsigned int num_queues = netdev->real_num_tx_queues;
 
-       return sprintf(buf, "%u\n", info->rx_min_target);
+       if (num_queues)
+               return sprintf(buf, "%u\n", info->queues[0].rx_min_target);
+       else
+               return sprintf(buf, "%u\n", RX_MIN_TARGET);
 }
 
 static ssize_t store_rxbuf_min(struct device *dev,
@@ -1919,8 +2074,11 @@ static ssize_t store_rxbuf_min(struct device *dev,
 {
        struct net_device *netdev = to_net_dev(dev);
        struct netfront_info *np = netdev_priv(netdev);
+       unsigned int num_queues = netdev->real_num_tx_queues;
        char *endp;
        unsigned long target;
+       unsigned int i;
+       struct netfront_queue *queue;
 
        if (!capable(CAP_NET_ADMIN))
                return -EPERM;
@@ -1934,16 +2092,19 @@ static ssize_t store_rxbuf_min(struct device *dev,
        if (target > RX_MAX_TARGET)
                target = RX_MAX_TARGET;
 
-       spin_lock_bh(&np->rx_lock);
-       if (target > np->rx_max_target)
-               np->rx_max_target = target;
-       np->rx_min_target = target;
-       if (target > np->rx_target)
-               np->rx_target = target;
+       for (i = 0; i < num_queues; ++i) {
+               queue = &np->queues[i];
+               spin_lock_bh(&queue->rx_lock);
+               if (target > queue->rx_max_target)
+                       queue->rx_max_target = target;
+               queue->rx_min_target = target;
+               if (target > queue->rx_target)
+                       queue->rx_target = target;
 
-       xennet_alloc_rx_buffers(netdev);
+               xennet_alloc_rx_buffers(queue);
 
-       spin_unlock_bh(&np->rx_lock);
+               spin_unlock_bh(&queue->rx_lock);
+       }
        return len;
 }
 
@@ -1952,8 +2113,12 @@ static ssize_t show_rxbuf_max(struct device *dev,
 {
        struct net_device *netdev = to_net_dev(dev);
        struct netfront_info *info = netdev_priv(netdev);
+       unsigned int num_queues = netdev->real_num_tx_queues;
 
-       return sprintf(buf, "%u\n", info->rx_max_target);
+       if (num_queues)
+               return sprintf(buf, "%u\n", info->queues[0].rx_max_target);
+       else
+               return sprintf(buf, "%u\n", RX_MAX_TARGET);
 }
 
 static ssize_t store_rxbuf_max(struct device *dev,
@@ -1962,8 +2127,11 @@ static ssize_t store_rxbuf_max(struct device *dev,
 {
        struct net_device *netdev = to_net_dev(dev);
        struct netfront_info *np = netdev_priv(netdev);
+       unsigned int num_queues = netdev->real_num_tx_queues;
        char *endp;
        unsigned long target;
+       unsigned int i = 0;
+       struct netfront_queue *queue = NULL;
 
        if (!capable(CAP_NET_ADMIN))
                return -EPERM;
@@ -1977,16 +2145,19 @@ static ssize_t store_rxbuf_max(struct device *dev,
        if (target > RX_MAX_TARGET)
                target = RX_MAX_TARGET;
 
-       spin_lock_bh(&np->rx_lock);
-       if (target < np->rx_min_target)
-               np->rx_min_target = target;
-       np->rx_max_target = target;
-       if (target < np->rx_target)
-               np->rx_target = target;
+       for (i = 0; i < num_queues; ++i) {
+               queue = &np->queues[i];
+               spin_lock_bh(&queue->rx_lock);
+               if (target < queue->rx_min_target)
+                       queue->rx_min_target = target;
+               queue->rx_max_target = target;
+               if (target < queue->rx_target)
+                       queue->rx_target = target;
 
-       xennet_alloc_rx_buffers(netdev);
+               xennet_alloc_rx_buffers(queue);
 
-       spin_unlock_bh(&np->rx_lock);
+               spin_unlock_bh(&queue->rx_lock);
+       }
        return len;
 }
 
@@ -1995,8 +2166,12 @@ static ssize_t show_rxbuf_cur(struct device *dev,
 {
        struct net_device *netdev = to_net_dev(dev);
        struct netfront_info *info = netdev_priv(netdev);
+       unsigned int num_queues = netdev->real_num_tx_queues;
 
-       return sprintf(buf, "%u\n", info->rx_target);
+       if (num_queues)
+               return sprintf(buf, "%u\n", info->queues[0].rx_target);
+       else
+               return sprintf(buf, "0\n");
 }
 
 static struct device_attribute xennet_attrs[] = {
@@ -2043,6 +2218,9 @@ static const struct xenbus_device_id netfront_ids[] = {
 static int xennet_remove(struct xenbus_device *dev)
 {
        struct netfront_info *info = dev_get_drvdata(&dev->dev);
+       unsigned int num_queues = info->netdev->real_num_tx_queues;
+       struct netfront_queue *queue = NULL;
+       unsigned int i = 0;
 
        dev_dbg(&dev->dev, "%s\n", dev->nodename);
 
@@ -2052,7 +2230,15 @@ static int xennet_remove(struct xenbus_device *dev)
 
        unregister_netdev(info->netdev);
 
-       del_timer_sync(&info->rx_refill_timer);
+       for (i = 0; i < num_queues; ++i) {
+               queue = &info->queues[i];
+               del_timer_sync(&queue->rx_refill_timer);
+       }
+
+       if (num_queues) {
+               kfree(info->queues);
+               info->queues = NULL;
+       }
 
        free_percpu(info->stats);
 
-- 
1.7.10.4


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