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net: Fix possible wrong checksum generation.

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Patch cef401de7b (net: fix possible wrong checksum
generation) fixed wrong checksum calculation but it broke TSO by
defining new GSO type but not a netdev feature for that type.
net_gso_ok() would not allow hardware checksum/segmentation
offload of such packets without the feature.

Following patch fixes TSO and wrong checksum. This patch uses
same logic that Eric Dumazet used. Patch introduces new flag
SKBTX_SHARED_FRAG if at least one frag can be modified by
the user. but SKBTX_SHARED_FRAG flag is kept in skb shared
info tx_flags rather than gso_type.

tx_flags is better compared to gso_type since we can have skb with
shared frag without gso packet. It does not link SHARED_FRAG to
GSO, So there is no need to define netdev feature for this.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar
2013-02-11 09:27:41 +00:00
committed by David S. Miller
parent b8fa410035
commit c9af6db4c1
11 changed files with 29 additions and 38 deletions
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17
include/linux/skbuff.h
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@@ -230,6 +230,13 @@ enum {
/* generate wifi status information (where possible) */
SKBTX_WIFI_STATUS = 1 << 4,
/* This indicates at least one fragment might be overwritten
* (as in vmsplice(), sendfile() ...)
* If we need to compute a TX checksum, we'll need to copy
* all frags to avoid possible bad checksum
*/
SKBTX_SHARED_FRAG = 1 << 5,
};
/*
@@ -307,13 +314,6 @@ enum {
SKB_GSO_TCPV6 = 1 << 4,
SKB_GSO_FCOE = 1 << 5,
/* This indicates at least one fragment might be overwritten
* (as in vmsplice(), sendfile() ...)
* If we need to compute a TX checksum, we'll need to copy
* all frags to avoid possible bad checksum
*/
SKB_GSO_SHARED_FRAG = 1 << 6,
};
#if BITS_PER_LONG > 32
@@ -2220,7 +2220,8 @@ static inline int skb_linearize(struct sk_buff *skb)
*/
static inline bool skb_has_shared_frag(const struct sk_buff *skb)
{
return skb_shinfo(skb)->gso_type & SKB_GSO_SHARED_FRAG;
return skb_is_nonlinear(skb) &&
skb_shinfo(skb)->tx_flags & SKBTX_SHARED_FRAG;
}
/**