linux-kernel - [net-next PATCH v2 1/3] net: ethtool: Add Multicast and broadcast rate limit coalescing feature

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Date:	Wed, 9 Jul 2014 12:44:08 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	<netdev@...r.kernel.org>
CC:	<davem@...emloft.net>, <linux-api@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Mugunthan V N <mugunthanvnm@...com>
Subject: [net-next PATCH v2 1/3] net: ethtool: Add Multicast and broadcast rate limit coalescing feature

Add ability to limit the broadcast or multicast packets to prevent
the loading of the CPU by a hacker with a broadcast or multicast
packet flood.

Signed-off-by: Mugunthan V N <mugunthanvnm@...com>
---
 include/uapi/linux/ethtool.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index e3c7a71..96ade34 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -350,6 +350,8 @@ struct ethtool_modinfo {
  *	a TX interrupt, when the packet rate is above @pkt_rate_high.
  * @rate_sample_interval: How often to do adaptive coalescing packet rate
  *	sampling, measured in seconds.  Must not be zero.
+ * @rx_max_mcast: Threshold for high multicast packet rate (packets per second)
+ * @rx_max_bcast: Threshold for high broadcast packet rate (packets per second)
  *
  * Each pair of (usecs, max_frames) fields specifies that interrupts
  * should be coalesced until
@@ -400,6 +402,8 @@ struct ethtool_coalesce {
 	__u32	tx_coalesce_usecs_high;
 	__u32	tx_max_coalesced_frames_high;
 	__u32	rate_sample_interval;
+	__u32	rx_max_mcast;
+	__u32	rx_max_bcast;
 };
 
 /**
-- 
2.0.0.390.gcb682f8

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