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xen-netback: add control protocol implementation

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My recent patch to include/xen/interface/io/netif.h defines a new shared
ring (in addition to the rx and tx rings) for passing control messages
from a VM frontend driver to a backend driver.

A previous patch added the necessary boilerplate for mapping the control
ring from the frontend, should it be created. This patch adds
implementations for each of the defined protocol messages.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Durrant
2016-05-13 09:37:27 +01:00
committed by David S. Miller
parent 4e15ee2cb4
commit 40d8abdee8
5 changed files with 502 additions and 3 deletions
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24
drivers/net/xen-netback/interface.c
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@@ -151,6 +151,24 @@ void xenvif_wake_queue(struct xenvif_queue *queue)
netif_tx_wake_queue(netdev_get_tx_queue(dev, id));
}
static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb,
void *accel_priv,
select_queue_fallback_t fallback)
{
struct xenvif *vif = netdev_priv(dev);
unsigned int size = vif->hash.size;
if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
return fallback(dev, skb) % dev->real_num_tx_queues;
xenvif_set_skb_hash(vif, skb);
if (size == 0)
return skb_get_hash_raw(skb) % dev->real_num_tx_queues;
return vif->hash.mapping[skb_get_hash_raw(skb) % size];
}
static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct xenvif *vif = netdev_priv(dev);
@@ -395,6 +413,7 @@ static const struct ethtool_ops xenvif_ethtool_ops = {
};
static const struct net_device_ops xenvif_netdev_ops = {
.ndo_select_queue = xenvif_select_queue,
.ndo_start_xmit = xenvif_start_xmit,
.ndo_get_stats = xenvif_get_stats,
.ndo_open = xenvif_open,
@@ -563,6 +582,8 @@ int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
vif->ctrl_irq = err;
xenvif_init_hash(vif);
task = kthread_create(xenvif_ctrl_kthread, (void *)vif,
"%s-control", dev->name);
if (IS_ERR(task)) {
@@ -579,6 +600,7 @@ int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
return 0;
err_deinit:
xenvif_deinit_hash(vif);
unbind_from_irqhandler(vif->ctrl_irq, vif);
vif->ctrl_irq = 0;
@@ -749,6 +771,8 @@ void xenvif_disconnect_ctrl(struct xenvif *vif)
vif->ctrl_task = NULL;
}
xenvif_deinit_hash(vif);
if (vif->ctrl_irq) {
unbind_from_irqhandler(vif->ctrl_irq, vif);
vif->ctrl_irq = 0;