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authorHerbert Xu <herbert@gondor.apana.org.au>2006-06-22 05:40:14 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2006-06-23 05:07:29 -0400
commit7967168cefdbc63bf332d6b1548eca7cd65ebbcc (patch)
treec45759149ae0acdc89d746e556a0ae278d11776d /include/linux/skbuff.h
parentd4828d85d188dc70ed172802e798d3978bb6e29e (diff)
[NET]: Merge TSO/UFO fields in sk_buff
Having separate fields in sk_buff for TSO/UFO (tso_size/ufo_size) is not going to scale if we add any more segmentation methods (e.g., DCCP). So let's merge them. They were used to tell the protocol of a packet. This function has been subsumed by the new gso_type field. This is essentially a set of netdev feature bits (shifted by 16 bits) that are required to process a specific skb. As such it's easy to tell whether a given device can process a GSO skb: you just have to and the gso_type field and the netdev's features field. I've made gso_type a conjunction. The idea is that you have a base type (e.g., SKB_GSO_TCPV4) that can be modified further to support new features. For example, if we add a hardware TSO type that supports ECN, they would declare NETIF_F_TSO | NETIF_F_TSO_ECN. All TSO packets with CWR set would have a gso_type of SKB_GSO_TCPV4 | SKB_GSO_TCPV4_ECN while all other TSO packets would be SKB_GSO_TCPV4. This means that only the CWR packets need to be emulated in software. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/skbuff.h')
-rw-r--r--include/linux/skbuff.h12
1 files changed, 9 insertions, 3 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f8c7eb79a27f..97b0d2d1a6b0 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -134,9 +134,10 @@ struct skb_frag_struct {
134struct skb_shared_info { 134struct skb_shared_info {
135 atomic_t dataref; 135 atomic_t dataref;
136 unsigned short nr_frags; 136 unsigned short nr_frags;
137 unsigned short tso_size; 137 unsigned short gso_size;
138 unsigned short tso_segs; 138 /* Warning: this field is not always filled in (UFO)! */
139 unsigned short ufo_size; 139 unsigned short gso_segs;
140 unsigned short gso_type;
140 unsigned int ip6_frag_id; 141 unsigned int ip6_frag_id;
141 struct sk_buff *frag_list; 142 struct sk_buff *frag_list;
142 skb_frag_t frags[MAX_SKB_FRAGS]; 143 skb_frag_t frags[MAX_SKB_FRAGS];
@@ -168,6 +169,11 @@ enum {
168 SKB_FCLONE_CLONE, 169 SKB_FCLONE_CLONE,
169}; 170};
170 171
172enum {
173 SKB_GSO_TCPV4 = 1 << 0,
174 SKB_GSO_UDPV4 = 1 << 1,
175};
176
171/** 177/**
172 * struct sk_buff - socket buffer 178 * struct sk_buff - socket buffer
173 * @next: Next buffer in list 179 * @next: Next buffer in list