diff options
author | David Woodhouse <dwmw2@infradead.org> | 2006-09-24 17:05:59 -0400 |
---|---|---|
committer | David Woodhouse <dwmw2@infradead.org> | 2006-09-24 17:05:59 -0400 |
commit | 02b25fcff676125a88169c8a78d4c6dd647574ed (patch) | |
tree | 372fc8e885be41ba1819b2767c8889ecd97ff948 /include/linux/skbuff.h | |
parent | 1694176a210189312e31b083bac1e1688981219a (diff) | |
parent | a68aa1cc6f3203b8a332683ebde67a00f39eec43 (diff) |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'include/linux/skbuff.h')
-rw-r--r-- | include/linux/skbuff.h | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 755e9cddac47..85577a4ffa61 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h | |||
@@ -34,8 +34,9 @@ | |||
34 | #define HAVE_ALIGNABLE_SKB /* Ditto 8) */ | 34 | #define HAVE_ALIGNABLE_SKB /* Ditto 8) */ |
35 | 35 | ||
36 | #define CHECKSUM_NONE 0 | 36 | #define CHECKSUM_NONE 0 |
37 | #define CHECKSUM_HW 1 | 37 | #define CHECKSUM_PARTIAL 1 |
38 | #define CHECKSUM_UNNECESSARY 2 | 38 | #define CHECKSUM_UNNECESSARY 2 |
39 | #define CHECKSUM_COMPLETE 3 | ||
39 | 40 | ||
40 | #define SKB_DATA_ALIGN(X) (((X) + (SMP_CACHE_BYTES - 1)) & \ | 41 | #define SKB_DATA_ALIGN(X) (((X) + (SMP_CACHE_BYTES - 1)) & \ |
41 | ~(SMP_CACHE_BYTES - 1)) | 42 | ~(SMP_CACHE_BYTES - 1)) |
@@ -56,17 +57,17 @@ | |||
56 | * Apparently with secret goal to sell you new device, when you | 57 | * Apparently with secret goal to sell you new device, when you |
57 | * will add new protocol to your host. F.e. IPv6. 8) | 58 | * will add new protocol to your host. F.e. IPv6. 8) |
58 | * | 59 | * |
59 | * HW: the most generic way. Device supplied checksum of _all_ | 60 | * COMPLETE: the most generic way. Device supplied checksum of _all_ |
60 | * the packet as seen by netif_rx in skb->csum. | 61 | * the packet as seen by netif_rx in skb->csum. |
61 | * NOTE: Even if device supports only some protocols, but | 62 | * NOTE: Even if device supports only some protocols, but |
62 | * is able to produce some skb->csum, it MUST use HW, | 63 | * is able to produce some skb->csum, it MUST use COMPLETE, |
63 | * not UNNECESSARY. | 64 | * not UNNECESSARY. |
64 | * | 65 | * |
65 | * B. Checksumming on output. | 66 | * B. Checksumming on output. |
66 | * | 67 | * |
67 | * NONE: skb is checksummed by protocol or csum is not required. | 68 | * NONE: skb is checksummed by protocol or csum is not required. |
68 | * | 69 | * |
69 | * HW: device is required to csum packet as seen by hard_start_xmit | 70 | * PARTIAL: device is required to csum packet as seen by hard_start_xmit |
70 | * from skb->h.raw to the end and to record the checksum | 71 | * from skb->h.raw to the end and to record the checksum |
71 | * at skb->h.raw+skb->csum. | 72 | * at skb->h.raw+skb->csum. |
72 | * | 73 | * |
@@ -1261,14 +1262,14 @@ static inline int skb_linearize_cow(struct sk_buff *skb) | |||
1261 | * @len: length of data pulled | 1262 | * @len: length of data pulled |
1262 | * | 1263 | * |
1263 | * After doing a pull on a received packet, you need to call this to | 1264 | * After doing a pull on a received packet, you need to call this to |
1264 | * update the CHECKSUM_HW checksum, or set ip_summed to CHECKSUM_NONE | 1265 | * update the CHECKSUM_COMPLETE checksum, or set ip_summed to |
1265 | * so that it can be recomputed from scratch. | 1266 | * CHECKSUM_NONE so that it can be recomputed from scratch. |
1266 | */ | 1267 | */ |
1267 | 1268 | ||
1268 | static inline void skb_postpull_rcsum(struct sk_buff *skb, | 1269 | static inline void skb_postpull_rcsum(struct sk_buff *skb, |
1269 | const void *start, unsigned int len) | 1270 | const void *start, unsigned int len) |
1270 | { | 1271 | { |
1271 | if (skb->ip_summed == CHECKSUM_HW) | 1272 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
1272 | skb->csum = csum_sub(skb->csum, csum_partial(start, len, 0)); | 1273 | skb->csum = csum_sub(skb->csum, csum_partial(start, len, 0)); |
1273 | } | 1274 | } |
1274 | 1275 | ||
@@ -1287,7 +1288,7 @@ static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len) | |||
1287 | { | 1288 | { |
1288 | if (likely(len >= skb->len)) | 1289 | if (likely(len >= skb->len)) |
1289 | return 0; | 1290 | return 0; |
1290 | if (skb->ip_summed == CHECKSUM_HW) | 1291 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
1291 | skb->ip_summed = CHECKSUM_NONE; | 1292 | skb->ip_summed = CHECKSUM_NONE; |
1292 | return __pskb_trim(skb, len); | 1293 | return __pskb_trim(skb, len); |
1293 | } | 1294 | } |