From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mahesh Bandewar Subject: [PATCH 1/2] net: Allow ethtool to set interface in loopback mode. Date: Tue, 3 May 2011 18:18:54 -0700 Message-ID: <1304471935-402-2-git-send-email-maheshb@google.com> References: <1304471935-402-1-git-send-email-maheshb@google.com> Cc: netdev , Michael Chan , Ben Hutchings , =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= , Tom Herbert , Mahesh Bandewar To: Matt Carlson , David Miller Return-path: Received: from smtp-out.google.com ([216.239.44.51]:26907 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753756Ab1EDBTH (ORCPT ); Tue, 3 May 2011 21:19:07 -0400 In-Reply-To: <1304471935-402-1-git-send-email-maheshb@google.com> Sender: netdev-owner@vger.kernel.org List-ID: This patch enables ethtool to set the loopback mode on a given interface. By configuring the interface in loopback mode in conjunction with a policy route / rule, a userland application can stress the egress / ingress path exposing the flows of the change in progress and potentially help developer(s) understand the impact of those changes without even sending a packet out on the network. Following set of commands illustrates one such example - a) ip -4 addr add 192.168.1.1/24 dev eth1 b) ip -4 rule add from all iif eth1 lookup 250 c) ip -4 route add local 0/0 dev lo proto kernel scope host table 250 d) arp -Ds 192.168.1.100 eth1 e) arp -Ds 192.168.1.200 eth1 f) sysctl -w net.ipv4.ip_nonlocal_bind=1 g) sysctl -w net.ipv4.conf.all.accept_local=1 # Assuming that the machine has 8 cores h) taskset 000f netserver -L 192.168.1.200 i) taskset 00f0 netperf -t TCP_CRR -L 192.168.1.100 -H 192.168.1.200 -l 30 Signed-off-by: Mahesh Bandewar --- include/linux/netdevice.h | 3 ++- net/core/ethtool.c | 2 +- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index d5de66a..e7244ed 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1067,6 +1067,7 @@ struct net_device { #define NETIF_F_RXHASH (1 << 28) /* Receive hashing offload */ #define NETIF_F_RXCSUM (1 << 29) /* Receive checksumming offload */ #define NETIF_F_NOCACHE_COPY (1 << 30) /* Use no-cache copyfromuser */ +#define NETIF_F_LOOPBACK (1 << 31) /* Enable loopback */ /* Segmentation offload features */ #define NETIF_F_GSO_SHIFT 16 @@ -1082,7 +1083,7 @@ struct net_device { /* = all defined minus driver/device-class-related */ #define NETIF_F_NEVER_CHANGE (NETIF_F_VLAN_CHALLENGED | \ NETIF_F_LLTX | NETIF_F_NETNS_LOCAL) -#define NETIF_F_ETHTOOL_BITS (0x7f3fffff & ~NETIF_F_NEVER_CHANGE) +#define NETIF_F_ETHTOOL_BITS (0xff3fffff & ~NETIF_F_NEVER_CHANGE) /* List of features with software fallbacks. */ #define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | \ diff --git a/net/core/ethtool.c b/net/core/ethtool.c index d8b1a8d..f26649d 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -362,7 +362,7 @@ static const char netdev_features_strings[ETHTOOL_DEV_FEATURE_WORDS * 32][ETH_GS /* NETIF_F_RXHASH */ "rx-hashing", /* NETIF_F_RXCSUM */ "rx-checksum", /* NETIF_F_NOCACHE_COPY */ "tx-nocache-copy" - "", + /* NETIF_F_LOOPBACK */ "loopback", }; static int __ethtool_get_sset_count(struct net_device *dev, int sset) -- 1.7.3.1