From: Eric Dumazet <eduma...@google.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 <eduma...@google.com>
Bisected-by: Haiyang Zhang <haiya...@microsoft.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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