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Message-ID: <1311340653-19336-4-git-send-email-ian.campbell@citrix.com>
Date: Fri, 22 Jul 2011 14:17:24 +0100
From: Ian Campbell <ian.campbell@...rix.com>
To: netdev@...r.kernel.org, linux-nfs@...r.kernel.org
CC: Ian Campbell <ian.campbell@...rix.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <eric.dumazet@...il.com>,
Michał Mirosław <mirq-linux@...e.qmqm.pl>
Subject: [PATCH 04/13] net: convert core to skb paged frag APIs
Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <eric.dumazet@...il.com>
Cc: "Michał Mirosław" <mirq-linux@...e.qmqm.pl>
Cc: netdev@...r.kernel.org
---
include/linux/skbuff.h | 4 ++--
net/core/datagram.c | 20 ++++++++------------
net/core/dev.c | 7 +++----
net/core/kmap_skb.h | 2 +-
net/core/pktgen.c | 3 +--
net/core/skbuff.c | 31 +++++++++++++++++--------------
net/core/sock.c | 12 +++++-------
net/core/user_dma.c | 2 +-
8 files changed, 38 insertions(+), 43 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f4034af..bc6bd24 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1906,12 +1906,12 @@ static inline int skb_add_data(struct sk_buff *skb,
}
static inline int skb_can_coalesce(struct sk_buff *skb, int i,
- struct page *page, int off)
+ const struct page *page, int off)
{
if (i) {
struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i - 1];
- return page == frag->page &&
+ return page == skb_frag_page(frag) &&
off == frag->page_offset + frag->size;
}
return 0;
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 18ac112..f0dcaa2 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -332,14 +332,13 @@ int skb_copy_datagram_iovec(const struct sk_buff *skb, int offset,
int err;
u8 *vaddr;
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
- struct page *page = frag->page;
if (copy > len)
copy = len;
- vaddr = kmap(page);
+ vaddr = skb_frag_kmap(frag);
err = memcpy_toiovec(to, vaddr + frag->page_offset +
offset - start, copy);
- kunmap(page);
+ skb_frag_kunmap(frag);
if (err)
goto fault;
if (!(len -= copy))
@@ -418,14 +417,13 @@ int skb_copy_datagram_const_iovec(const struct sk_buff *skb, int offset,
int err;
u8 *vaddr;
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
- struct page *page = frag->page;
if (copy > len)
copy = len;
- vaddr = kmap(page);
+ vaddr = skb_frag_kmap(frag);
err = memcpy_toiovecend(to, vaddr + frag->page_offset +
offset - start, to_offset, copy);
- kunmap(page);
+ skb_frag_kunmap(frag);
if (err)
goto fault;
if (!(len -= copy))
@@ -508,15 +506,14 @@ int skb_copy_datagram_from_iovec(struct sk_buff *skb, int offset,
int err;
u8 *vaddr;
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
- struct page *page = frag->page;
if (copy > len)
copy = len;
- vaddr = kmap(page);
+ vaddr = skb_frag_kmap(frag);
err = memcpy_fromiovecend(vaddr + frag->page_offset +
offset - start,
from, from_offset, copy);
- kunmap(page);
+ skb_frag_kunmap(frag);
if (err)
goto fault;
@@ -594,16 +591,15 @@ static int skb_copy_and_csum_datagram(const struct sk_buff *skb, int offset,
int err = 0;
u8 *vaddr;
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
- struct page *page = frag->page;
if (copy > len)
copy = len;
- vaddr = kmap(page);
+ vaddr = skb_frag_kmap(frag);
csum2 = csum_and_copy_to_user(vaddr +
frag->page_offset +
offset - start,
to, copy, 0, &err);
- kunmap(page);
+ skb_frag_kunmap(frag);
if (err)
goto fault;
*csump = csum_block_add(*csump, csum2, pos);
diff --git a/net/core/dev.c b/net/core/dev.c
index 9c58c1e..9ab39c0 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3414,7 +3414,7 @@ pull:
skb_shinfo(skb)->frags[0].size -= grow;
if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
- put_page(skb_shinfo(skb)->frags[0].page);
+ skb_frag_unref(skb, 0);
memmove(skb_shinfo(skb)->frags,
skb_shinfo(skb)->frags + 1,
--skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
@@ -3478,10 +3478,9 @@ void skb_gro_reset_offset(struct sk_buff *skb)
NAPI_GRO_CB(skb)->frag0_len = 0;
if (skb->mac_header == skb->tail &&
- !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
+ !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
NAPI_GRO_CB(skb)->frag0 =
- page_address(skb_shinfo(skb)->frags[0].page) +
- skb_shinfo(skb)->frags[0].page_offset;
+ skb_frag_address(&skb_shinfo(skb)->frags[0]);
NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
}
}
diff --git a/net/core/kmap_skb.h b/net/core/kmap_skb.h
index 283c2b9..b1e9711 100644
--- a/net/core/kmap_skb.h
+++ b/net/core/kmap_skb.h
@@ -7,7 +7,7 @@ static inline void *kmap_skb_frag(const skb_frag_t *frag)
local_bh_disable();
#endif
- return kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ);
+ return kmap_atomic(__skb_frag_page(frag), KM_SKB_DATA_SOFTIRQ);
}
static inline void kunmap_skb_frag(void *vaddr)
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index f76079c..989b2b6 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -2600,8 +2600,7 @@ static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
if (!pkt_dev->page)
break;
}
- skb_shinfo(skb)->frags[i].page = pkt_dev->page;
- get_page(pkt_dev->page);
+ skb_frag_set_page(skb, i, pkt_dev->page);
skb_shinfo(skb)->frags[i].page_offset = 0;
/*last fragment, fill rest of data*/
if (i == (frags - 1))
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 46cbd28..2133600 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -326,7 +326,7 @@ static void skb_release_data(struct sk_buff *skb)
if (skb_shinfo(skb)->nr_frags) {
int i;
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
- put_page(skb_shinfo(skb)->frags[i].page);
+ skb_frag_unref(skb, i);
}
if (skb_has_frag_list(skb))
@@ -733,7 +733,7 @@ struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask)
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
skb_shinfo(n)->frags[i] = skb_shinfo(skb)->frags[i];
- get_page(skb_shinfo(n)->frags[i].page);
+ skb_frag_ref(skb, i);
}
skb_shinfo(n)->nr_frags = i;
}
@@ -820,7 +820,7 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
kfree(skb->head);
} else {
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
- get_page(skb_shinfo(skb)->frags[i].page);
+ skb_frag_ref(skb, i);
if (skb_has_frag_list(skb))
skb_clone_fraglist(skb);
@@ -1098,7 +1098,7 @@ drop_pages:
skb_shinfo(skb)->nr_frags = i;
for (; i < nfrags; i++)
- put_page(skb_shinfo(skb)->frags[i].page);
+ skb_frag_unref(skb, i);
if (skb_has_frag_list(skb))
skb_drop_fraglist(skb);
@@ -1267,7 +1267,7 @@ pull_pages:
k = 0;
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
if (skb_shinfo(skb)->frags[i].size <= eat) {
- put_page(skb_shinfo(skb)->frags[i].page);
+ skb_frag_unref(skb, i);
eat -= skb_shinfo(skb)->frags[i].size;
} else {
skb_shinfo(skb)->frags[k] = skb_shinfo(skb)->frags[i];
@@ -1512,7 +1512,9 @@ static int __skb_splice_bits(struct sk_buff *skb, struct pipe_inode_info *pipe,
for (seg = 0; seg < skb_shinfo(skb)->nr_frags; seg++) {
const skb_frag_t *f = &skb_shinfo(skb)->frags[seg];
- if (__splice_segment(f->page, f->page_offset, f->size,
+ /* XXX */
+ if (__splice_segment(__skb_frag_page(f),
+ f->page_offset, f->size,
offset, len, skb, spd, 0, sk, pipe))
return 1;
}
@@ -2057,7 +2059,7 @@ static inline void skb_split_no_header(struct sk_buff *skb,
* where splitting is expensive.
* 2. Split is accurately. We make this.
*/
- get_page(skb_shinfo(skb)->frags[i].page);
+ skb_frag_ref(skb, i);
skb_shinfo(skb1)->frags[0].page_offset += len - pos;
skb_shinfo(skb1)->frags[0].size -= len - pos;
skb_shinfo(skb)->frags[i].size = len - pos;
@@ -2132,7 +2134,8 @@ int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen)
* commit all, so that we don't have to undo partial changes
*/
if (!to ||
- !skb_can_coalesce(tgt, to, fragfrom->page, fragfrom->page_offset)) {
+ !skb_can_coalesce(tgt, to, skb_frag_page(fragfrom),
+ fragfrom->page_offset)) {
merge = -1;
} else {
merge = to - 1;
@@ -2179,7 +2182,7 @@ int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen)
to++;
} else {
- get_page(fragfrom->page);
+ __skb_frag_ref(fragfrom);
fragto->page = fragfrom->page;
fragto->page_offset = fragfrom->page_offset;
fragto->size = todo;
@@ -2201,7 +2204,7 @@ int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen)
fragto = &skb_shinfo(tgt)->frags[merge];
fragto->size += fragfrom->size;
- put_page(fragfrom->page);
+ __skb_frag_unref(fragfrom);
}
/* Reposition in the original skb */
@@ -2446,8 +2449,7 @@ int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb,
left = PAGE_SIZE - frag->page_offset;
copy = (length > left)? left : length;
- ret = getfrag(from, (page_address(frag->page) +
- frag->page_offset + frag->size),
+ ret = getfrag(from, skb_frag_address(frag) + frag->size,
offset, copy, 0, skb);
if (ret < 0)
return -EFAULT;
@@ -2599,7 +2601,7 @@ struct sk_buff *skb_segment(struct sk_buff *skb, u32 features)
while (pos < offset + len && i < nfrags) {
*frag = skb_shinfo(skb)->frags[i];
- get_page(frag->page);
+ __skb_frag_ref(frag);
size = frag->size;
if (pos < offset) {
@@ -2822,7 +2824,8 @@ __skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len)
if (copy > len)
copy = len;
- sg_set_page(&sg[elt], frag->page, copy,
+ /* XXX */
+ sg_set_page(&sg[elt], __skb_frag_page(frag), copy,
frag->page_offset+offset-start);
elt++;
if (!(len -= copy))
diff --git a/net/core/sock.c b/net/core/sock.c
index 6e81978..0fb2160 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1530,7 +1530,6 @@ struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
skb_shinfo(skb)->nr_frags = npages;
for (i = 0; i < npages; i++) {
struct page *page;
- skb_frag_t *frag;
page = alloc_pages(sk->sk_allocation, 0);
if (!page) {
@@ -1540,12 +1539,11 @@ struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
goto failure;
}
- frag = &skb_shinfo(skb)->frags[i];
- frag->page = page;
- frag->page_offset = 0;
- frag->size = (data_len >= PAGE_SIZE ?
- PAGE_SIZE :
- data_len);
+ __skb_fill_page_desc(skb, i,
+ page, 0,
+ (data_len >= PAGE_SIZE ?
+ PAGE_SIZE :
+ data_len));
data_len -= PAGE_SIZE;
}
diff --git a/net/core/user_dma.c b/net/core/user_dma.c
index 25d717e..d22ec3e 100644
--- a/net/core/user_dma.c
+++ b/net/core/user_dma.c
@@ -78,7 +78,7 @@ int dma_skb_copy_datagram_iovec(struct dma_chan *chan,
copy = end - offset;
if (copy > 0) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
- struct page *page = frag->page;
+ struct page *page = __skb_frag_page(frag); /* XXX */
if (copy > len)
copy = len;
--
1.7.2.5
--
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