From: Jiri Pirko <jiri@resnulli.us>
Date: Fri, 20 Jul 2012 02:28:48 +0000 (+0000)
Subject: rtnl: allow to specify number of rx and tx queues on device creation
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=76ff5cc91935c51fcf1a6a99ffa28b97a6e7a884;p=openwrt%2Fstaging%2Fblogic.git

rtnl: allow to specify number of rx and tx queues on device creation

This patch introduces IFLA_NUM_TX_QUEUES and IFLA_NUM_RX_QUEUES by
which userspace can set number of rx and/or tx queues to be allocated
for newly created netdevice.
This overrides ops->get_num_[tr]x_queues()

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/linux/if_link.h b/include/linux/if_link.h
index f715750d0b87..ac173bd2ab65 100644
--- a/include/linux/if_link.h
+++ b/include/linux/if_link.h
@@ -140,6 +140,8 @@ enum {
 	IFLA_EXT_MASK,		/* Extended info mask, VFs, etc */
 	IFLA_PROMISCUITY,	/* Promiscuity count: > 0 means acts PROMISC */
 #define IFLA_PROMISCUITY IFLA_PROMISCUITY
+	IFLA_NUM_TX_QUEUES,
+	IFLA_NUM_RX_QUEUES,
 	__IFLA_MAX
 };
 
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index db5a8ad8a79b..5bb1ebca2eb0 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -771,6 +771,8 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
 	       + nla_total_size(4) /* IFLA_LINK */
 	       + nla_total_size(4) /* IFLA_MASTER */
 	       + nla_total_size(4) /* IFLA_PROMISCUITY */
+	       + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
+	       + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
 	       + nla_total_size(1) /* IFLA_OPERSTATE */
 	       + nla_total_size(1) /* IFLA_LINKMODE */
 	       + nla_total_size(ext_filter_mask
@@ -889,6 +891,8 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
 	    nla_put_u32(skb, IFLA_GROUP, dev->group) ||
 	    nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
+	    nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
+	    nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
 	    (dev->ifindex != dev->iflink &&
 	     nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
 	    (dev->master &&
@@ -1106,6 +1110,8 @@ const struct nla_policy ifla_policy[IFLA_MAX+1] = {
 	[IFLA_AF_SPEC]		= { .type = NLA_NESTED },
 	[IFLA_EXT_MASK]		= { .type = NLA_U32 },
 	[IFLA_PROMISCUITY]	= { .type = NLA_U32 },
+	[IFLA_NUM_TX_QUEUES]	= { .type = NLA_U32 },
+	[IFLA_NUM_RX_QUEUES]	= { .type = NLA_U32 },
 };
 EXPORT_SYMBOL(ifla_policy);
 
@@ -1627,9 +1633,14 @@ struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
 	unsigned int num_tx_queues = 1;
 	unsigned int num_rx_queues = 1;
 
-	if (ops->get_num_tx_queues)
+	if (tb[IFLA_NUM_TX_QUEUES])
+		num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
+	else if (ops->get_num_tx_queues)
 		num_tx_queues = ops->get_num_tx_queues();
-	if (ops->get_num_rx_queues)
+
+	if (tb[IFLA_NUM_RX_QUEUES])
+		num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
+	else if (ops->get_num_rx_queues)
 		num_rx_queues = ops->get_num_rx_queues();
 
 	err = -ENOMEM;