netdev - [PATCH net-next] net: increase LL_MAX_HEADER if HYPERV

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Message-ID: <1446398459.6254.90.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sun, 01 Nov 2015 09:20:59 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Haiyang Zhang <haiyangz@...rosoft.com>
Cc:	"edumazet@...gle.com" <edumazet@...gle.com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	KY Srinivasan <kys@...rosoft.com>
Subject: [PATCH net-next] net: increase LL_MAX_HEADER if HYPERV_NET is
 enabled

From: Eric Dumazet <edumazet@...gle.com>

My recent commit, attaching SYNACK messages to request sockets
exposed a too small LL_MAX_HEADER when netvsc_drv.c is in use,
because this driver sets a needed_headroom of 220 bytes.

Increase LL_MAX_HEADER in this case, to avoid a realloc of all
TCP frames.

In another patch, I'll make skb_set_owner_w() more robust.

Fixes: ca6fb0651883 ("tcp: attach SYNACK messages to request sockets instead of listener")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Bisected-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 include/linux/netdevice.h |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4ac653b7b8ac..04e3864e660e 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -132,8 +132,10 @@ static inline bool dev_xmit_complete(int rc)
  *	used.
  */
 
-#if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
-# if defined(CONFIG_MAC80211_MESH)
+#if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25) || IS_ENABLED(CONFIG_HYPERV_NET)
+# if IS_ENABLED(CONFIG_HYPERV_NET)
+# define LL_MAX_HEADER 256
+# elif defined(CONFIG_MAC80211_MESH)
 #  define LL_MAX_HEADER 128
 # else
 #  define LL_MAX_HEADER 96


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