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Date: Tue, 09 Jun 2009 05:02:12 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
Subject: [PATCH 7/15]: net/core/skbuff.c: Use frag list abstraction
interfaces.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
net/core/skbuff.c | 230 ++++++++++++++++++++++++----------------------------
1 files changed, 106 insertions(+), 124 deletions(-)
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index a2473b1..49961ba 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -210,7 +210,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
shinfo->gso_type = 0;
shinfo->ip6_frag_id = 0;
shinfo->tx_flags.flags = 0;
- shinfo->frag_list = NULL;
+ skb_frag_list_init(skb);
memset(&shinfo->hwtstamps, 0, sizeof(shinfo->hwtstamps));
if (fclone) {
@@ -323,7 +323,7 @@ static void skb_clone_fraglist(struct sk_buff *skb)
{
struct sk_buff *list;
- for (list = skb_shinfo(skb)->frag_list; list; list = list->next)
+ skb_walk_frags(skb, list)
skb_get(list);
}
@@ -338,7 +338,7 @@ static void skb_release_data(struct sk_buff *skb)
put_page(skb_shinfo(skb)->frags[i].page);
}
- if (skb_shinfo(skb)->frag_list)
+ if (skb_has_frags(skb))
skb_drop_fraglist(skb);
kfree(skb->head);
@@ -503,7 +503,7 @@ int skb_recycle_check(struct sk_buff *skb, int skb_size)
shinfo->gso_type = 0;
shinfo->ip6_frag_id = 0;
shinfo->tx_flags.flags = 0;
- shinfo->frag_list = NULL;
+ skb_frag_list_init(skb);
memset(&shinfo->hwtstamps, 0, sizeof(shinfo->hwtstamps));
memset(skb, 0, offsetof(struct sk_buff, tail));
@@ -758,7 +758,7 @@ struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask)
skb_shinfo(n)->nr_frags = i;
}
- if (skb_shinfo(skb)->frag_list) {
+ if (skb_has_frags(skb)) {
skb_shinfo(n)->frag_list = skb_shinfo(skb)->frag_list;
skb_clone_fraglist(n);
}
@@ -821,7 +821,7 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
get_page(skb_shinfo(skb)->frags[i].page);
- if (skb_shinfo(skb)->frag_list)
+ if (skb_has_frags(skb))
skb_clone_fraglist(skb);
skb_release_data(skb);
@@ -1093,7 +1093,7 @@ drop_pages:
for (; i < nfrags; i++)
put_page(skb_shinfo(skb)->frags[i].page);
- if (skb_shinfo(skb)->frag_list)
+ if (skb_has_frags(skb))
skb_drop_fraglist(skb);
goto done;
}
@@ -1188,7 +1188,7 @@ unsigned char *__pskb_pull_tail(struct sk_buff *skb, int delta)
/* Optimization: no fragments, no reasons to preestimate
* size of pulled pages. Superb.
*/
- if (!skb_shinfo(skb)->frag_list)
+ if (!skb_has_frags(skb))
goto pull_pages;
/* Estimate size of pulled pages. */
@@ -1285,8 +1285,9 @@ EXPORT_SYMBOL(__pskb_pull_tail);
int skb_copy_bits(const struct sk_buff *skb, int offset, void *to, int len)
{
- int i, copy;
int start = skb_headlen(skb);
+ struct sk_buff *frag_iter;
+ int i, copy;
if (offset > (int)skb->len - len)
goto fault;
@@ -1328,28 +1329,23 @@ int skb_copy_bits(const struct sk_buff *skb, int offset, void *to, int len)
start = end;
}
- if (skb_shinfo(skb)->frag_list) {
- struct sk_buff *list = skb_shinfo(skb)->frag_list;
+ skb_walk_frags(skb, frag_iter) {
+ int end;
- for (; list; list = list->next) {
- int end;
-
- WARN_ON(start > offset + len);
-
- end = start + list->len;
- if ((copy = end - offset) > 0) {
- if (copy > len)
- copy = len;
- if (skb_copy_bits(list, offset - start,
- to, copy))
- goto fault;
- if ((len -= copy) == 0)
- return 0;
- offset += copy;
- to += copy;
- }
- start = end;
+ WARN_ON(start > offset + len);
+
+ end = start + frag_iter->len;
+ if ((copy = end - offset) > 0) {
+ if (copy > len)
+ copy = len;
+ if (skb_copy_bits(frag_iter, offset - start, to, copy))
+ goto fault;
+ if ((len -= copy) == 0)
+ return 0;
+ offset += copy;
+ to += copy;
}
+ start = end;
}
if (!len)
return 0;
@@ -1534,6 +1530,7 @@ int skb_splice_bits(struct sk_buff *skb, unsigned int offset,
.ops = &sock_pipe_buf_ops,
.spd_release = sock_spd_release,
};
+ struct sk_buff *frag_iter;
struct sock *sk = skb->sk;
/*
@@ -1548,13 +1545,11 @@ int skb_splice_bits(struct sk_buff *skb, unsigned int offset,
/*
* now see if we have a frag_list to map
*/
- if (skb_shinfo(skb)->frag_list) {
- struct sk_buff *list = skb_shinfo(skb)->frag_list;
-
- for (; list && tlen; list = list->next) {
- if (__skb_splice_bits(list, &offset, &tlen, &spd, sk))
- break;
- }
+ skb_walk_frags(skb, frag_iter) {
+ if (!tlen)
+ break;
+ if (__skb_splice_bits(frag_iter, &offset, &tlen, &spd, sk))
+ break;
}
done:
@@ -1593,8 +1588,9 @@ done:
int skb_store_bits(struct sk_buff *skb, int offset, const void *from, int len)
{
- int i, copy;
int start = skb_headlen(skb);
+ struct sk_buff *frag_iter;
+ int i, copy;
if (offset > (int)skb->len - len)
goto fault;
@@ -1635,28 +1631,24 @@ int skb_store_bits(struct sk_buff *skb, int offset, const void *from, int len)
start = end;
}
- if (skb_shinfo(skb)->frag_list) {
- struct sk_buff *list = skb_shinfo(skb)->frag_list;
+ skb_walk_frags(skb, frag_iter) {
+ int end;
- for (; list; list = list->next) {
- int end;
-
- WARN_ON(start > offset + len);
-
- end = start + list->len;
- if ((copy = end - offset) > 0) {
- if (copy > len)
- copy = len;
- if (skb_store_bits(list, offset - start,
- from, copy))
- goto fault;
- if ((len -= copy) == 0)
- return 0;
- offset += copy;
- from += copy;
- }
- start = end;
+ WARN_ON(start > offset + len);
+
+ end = start + frag_iter->len;
+ if ((copy = end - offset) > 0) {
+ if (copy > len)
+ copy = len;
+ if (skb_store_bits(frag_iter, offset - start,
+ from, copy))
+ goto fault;
+ if ((len -= copy) == 0)
+ return 0;
+ offset += copy;
+ from += copy;
}
+ start = end;
}
if (!len)
return 0;
@@ -1673,6 +1665,7 @@ __wsum skb_checksum(const struct sk_buff *skb, int offset,
{
int start = skb_headlen(skb);
int i, copy = start - offset;
+ struct sk_buff *frag_iter;
int pos = 0;
/* Checksum header. */
@@ -1712,29 +1705,25 @@ __wsum skb_checksum(const struct sk_buff *skb, int offset,
start = end;
}
- if (skb_shinfo(skb)->frag_list) {
- struct sk_buff *list = skb_shinfo(skb)->frag_list;
+ skb_walk_frags(skb, frag_iter) {
+ int end;
- for (; list; list = list->next) {
- int end;
-
- WARN_ON(start > offset + len);
-
- end = start + list->len;
- if ((copy = end - offset) > 0) {
- __wsum csum2;
- if (copy > len)
- copy = len;
- csum2 = skb_checksum(list, offset - start,
- copy, 0);
- csum = csum_block_add(csum, csum2, pos);
- if ((len -= copy) == 0)
- return csum;
- offset += copy;
- pos += copy;
- }
- start = end;
+ WARN_ON(start > offset + len);
+
+ end = start + frag_iter->len;
+ if ((copy = end - offset) > 0) {
+ __wsum csum2;
+ if (copy > len)
+ copy = len;
+ csum2 = skb_checksum(frag_iter, offset - start,
+ copy, 0);
+ csum = csum_block_add(csum, csum2, pos);
+ if ((len -= copy) == 0)
+ return csum;
+ offset += copy;
+ pos += copy;
}
+ start = end;
}
BUG_ON(len);
@@ -1749,6 +1738,7 @@ __wsum skb_copy_and_csum_bits(const struct sk_buff *skb, int offset,
{
int start = skb_headlen(skb);
int i, copy = start - offset;
+ struct sk_buff *frag_iter;
int pos = 0;
/* Copy header. */
@@ -1793,31 +1783,27 @@ __wsum skb_copy_and_csum_bits(const struct sk_buff *skb, int offset,
start = end;
}
- if (skb_shinfo(skb)->frag_list) {
- struct sk_buff *list = skb_shinfo(skb)->frag_list;
+ skb_walk_frags(skb, frag_iter) {
+ __wsum csum2;
+ int end;
- for (; list; list = list->next) {
- __wsum csum2;
- int end;
-
- WARN_ON(start > offset + len);
-
- end = start + list->len;
- if ((copy = end - offset) > 0) {
- if (copy > len)
- copy = len;
- csum2 = skb_copy_and_csum_bits(list,
- offset - start,
- to, copy, 0);
- csum = csum_block_add(csum, csum2, pos);
- if ((len -= copy) == 0)
- return csum;
- offset += copy;
- to += copy;
- pos += copy;
- }
- start = end;
+ WARN_ON(start > offset + len);
+
+ end = start + frag_iter->len;
+ if ((copy = end - offset) > 0) {
+ if (copy > len)
+ copy = len;
+ csum2 = skb_copy_and_csum_bits(frag_iter,
+ offset - start,
+ to, copy, 0);
+ csum = csum_block_add(csum, csum2, pos);
+ if ((len -= copy) == 0)
+ return csum;
+ offset += copy;
+ to += copy;
+ pos += copy;
}
+ start = end;
}
BUG_ON(len);
return csum;
@@ -2327,8 +2313,7 @@ next_skb:
st->frag_data = NULL;
}
- if (st->root_skb == st->cur_skb &&
- skb_shinfo(st->root_skb)->frag_list) {
+ if (st->root_skb == st->cur_skb && skb_has_frags(st->root_skb)) {
st->cur_skb = skb_shinfo(st->root_skb)->frag_list;
st->frag_idx = 0;
goto next_skb;
@@ -2639,7 +2624,7 @@ struct sk_buff *skb_segment(struct sk_buff *skb, int features)
} else
skb_get(fskb2);
- BUG_ON(skb_shinfo(nskb)->frag_list);
+ SKB_FRAG_ASSERT(nskb);
skb_shinfo(nskb)->frag_list = fskb2;
}
@@ -2796,6 +2781,7 @@ __skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len)
{
int start = skb_headlen(skb);
int i, copy = start - offset;
+ struct sk_buff *frag_iter;
int elt = 0;
if (copy > 0) {
@@ -2829,26 +2815,22 @@ __skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len)
start = end;
}
- if (skb_shinfo(skb)->frag_list) {
- struct sk_buff *list = skb_shinfo(skb)->frag_list;
-
- for (; list; list = list->next) {
- int end;
+ skb_walk_frags(skb, frag_iter) {
+ int end;
- WARN_ON(start > offset + len);
+ WARN_ON(start > offset + len);
- end = start + list->len;
- if ((copy = end - offset) > 0) {
- if (copy > len)
- copy = len;
- elt += __skb_to_sgvec(list, sg+elt, offset - start,
- copy);
- if ((len -= copy) == 0)
- return elt;
- offset += copy;
- }
- start = end;
+ end = start + frag_iter->len;
+ if ((copy = end - offset) > 0) {
+ if (copy > len)
+ copy = len;
+ elt += __skb_to_sgvec(frag_iter, sg+elt, offset - start,
+ copy);
+ if ((len -= copy) == 0)
+ return elt;
+ offset += copy;
}
+ start = end;
}
BUG_ON(len);
return elt;
@@ -2896,7 +2878,7 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
return -ENOMEM;
/* Easy case. Most of packets will go this way. */
- if (!skb_shinfo(skb)->frag_list) {
+ if (!skb_has_frags(skb)) {
/* A little of trouble, not enough of space for trailer.
* This should not happen, when stack is tuned to generate
* good frames. OK, on miss we reallocate and reserve even more
@@ -2931,7 +2913,7 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
if (skb1->next == NULL && tailbits) {
if (skb_shinfo(skb1)->nr_frags ||
- skb_shinfo(skb1)->frag_list ||
+ skb_has_frags(skb1) ||
skb_tailroom(skb1) < tailbits)
ntail = tailbits + 128;
}
@@ -2940,7 +2922,7 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
skb_cloned(skb1) ||
ntail ||
skb_shinfo(skb1)->nr_frags ||
- skb_shinfo(skb1)->frag_list) {
+ skb_has_frags(skb1)) {
struct sk_buff *skb2;
/* Fuck, we are miserable poor guys... */
--
1.6.3.2
--
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