netdev - Re: [patch] tcp: attach SYNACK messages to request sockets instead of listener

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Date:	Fri, 30 Oct 2015 13:18:51 -0700
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: Re: [patch] tcp: attach SYNACK messages to request sockets instead
 of listener

On Fri, 2015-10-30 at 13:02 -0700, Eric Dumazet wrote:

> So it looks like you have a device with a very big hh_len
> 
> MAX_TCP_HEADER is not enough space to hold all headers, and this is the
> bug that needs to be fixed. This is scary to realloc all tcp packets !
> 

drivers/net/hyperv/netvsc_drv.c sets a needed_headroom of 220 bytes :(

Could you try :

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4ac653b7b8ac..7dbdd29076be 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 384
+# elif defined(CONFIG_MAC80211_MESH)
 #  define LL_MAX_HEADER 128
 # else
 #  define LL_MAX_HEADER 96



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