path: root/drivers/net/xen-netback/netback.c
diff options
authorAndrew J. Bennieston <andrew.bennieston@citrix.com>2014-06-04 10:30:43 +0100
committerDavid S. Miller <davem@davemloft.net>2014-06-04 14:48:16 -0700
commit8d3d53b3e43363e79ab9a9ecc149b06c1314b25d (patch)
tree210f923600d75e52d562ee851ba57de9daaeb5b7 /drivers/net/xen-netback/netback.c
parentxen-netback: Factor queue-specific data into queue struct (diff)
xen-netback: Add support for multiple queues
Builds on the refactoring of the previous patch to implement multiple queues between xen-netfront and xen-netback. Writes the maximum supported number of queues into XenStore, and reads the values written by the frontend to determine how many queues to use. Ring references and event channels are read from XenStore on a per-queue basis and rings are connected accordingly. Also adds code to handle the cleanup of any already initialised queues if the initialisation of a subsequent queue fails. Signed-off-by: Andrew J. Bennieston <andrew.bennieston@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/xen-netback/netback.c')
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index a5484e8cb06e..49efff9b99f4 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -62,6 +62,11 @@ unsigned int rx_drain_timeout_msecs = 10000;
module_param(rx_drain_timeout_msecs, uint, 0444);
unsigned int rx_drain_timeout_jiffies;
+unsigned int xenvif_max_queues;
+module_param_named(max_queues, xenvif_max_queues, uint, 0644);
+ "Maximum number of queues per virtual interface");
* This is the maximum slots a skb can have. If a guest sends a skb
* which exceeds this limit it is considered malicious.
@@ -1953,6 +1958,9 @@ static int __init netback_init(void)
if (!xen_domain())
return -ENODEV;
+ /* Allow as many queues as there are CPUs, by default */
+ xenvif_max_queues = num_online_cpus();
if (fatal_skb_slots < XEN_NETBK_LEGACY_SLOTS_MAX) {
pr_info("fatal_skb_slots too small (%d), bump it to XEN_NETBK_LEGACY_SLOTS_MAX (%d)\n",
fatal_skb_slots, XEN_NETBK_LEGACY_SLOTS_MAX);