[Xen-devel] [RFC PATCH 11/13] xen-netfront: feature-persistent xenbus support

[Joao Martins <joao.martins@xxxxxxxxx>]

"feature-persistent" check on xenbus for persistent grants
support on the backend.

Signed-off-by: Joao Martins <joao.martins@xxxxxxxxx>
---
 drivers/net/xen-netfront.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 99c17c9..7f44cc7 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -162,6 +162,8 @@ struct netfront_info {
        struct netfront_stats __percpu *tx_stats;
 
        atomic_t rx_gso_checksum_fixup;
+
+       unsigned int feature_persistent:1;
 };
 
 struct netfront_rx_info {
@@ -1919,6 +1921,12 @@ again:
                goto abort_transaction;
        }
 
+       err = xenbus_write(xbt, dev->nodename, "feature-persistent", "1");
+       if (err) {
+               message = "writing feature-persistent";
+               goto abort_transaction;
+       }
+
        err = xenbus_transaction_end(xbt, 0);
        if (err) {
                if (err == -EAGAIN)
@@ -1950,6 +1958,7 @@ static int xennet_connect(struct net_device *dev)
        unsigned int num_queues = 0;
        int err;
        unsigned int feature_rx_copy;
+       unsigned int feature_persistent;
        unsigned int j = 0;
        struct netfront_queue *queue = NULL;
 
@@ -1964,6 +1973,13 @@ static int xennet_connect(struct net_device *dev)
                return -ENODEV;
        }
 
+       err = xenbus_gather(XBT_NIL, np->xbdev->otherend,
+                           "feature-persistent", "%u", &feature_persistent,
+                           NULL);
+       if (err)
+               feature_persistent = 0;
+       np->feature_persistent = !!feature_persistent;
+
        err = talk_to_netback(np->xbdev, np);
        if (err)
                return err;
-- 
2.1.3


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