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Message-Id: <d209be514b6eff718e0b6562da289faadd014806.1369406826.git.tgraf@suug.ch>
Date: Fri, 24 May 2013 16:52:22 +0200
From: Thomas Graf <tgraf@...g.ch>
To: netdev@...r.kernel.org, jesse@...ira.com
Cc: dev@...nvswitch.org, eric.dumazet@...il.com
Subject: [PATCH net-next 1/2] net: Export skb_zerocopy() to zerocopy from one skb to another
Make the skb zerocopy logic written for nfnetlink queue available for
use by other modules.
Signed-off-by: Thomas Graf <tgraf@...g.ch>
---
include/linux/skbuff.h | 2 ++
net/core/skbuff.c | 46 +++++++++++++++++++++++++++++++++++
net/netfilter/nfnetlink_queue_core.c | 47 +-----------------------------------
3 files changed, 49 insertions(+), 46 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 2e0ced1..ff2cbe8 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2478,6 +2478,8 @@ extern int skb_splice_bits(struct sk_buff *skb,
unsigned int len,
unsigned int flags);
extern void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to);
+extern void skb_zerocopy(struct sk_buff *to, const struct sk_buff *from,
+ int len, int hlen);
extern void skb_split(struct sk_buff *skb,
struct sk_buff *skb1, const u32 len);
extern int skb_shift(struct sk_buff *tgt, struct sk_buff *skb,
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index d629891..cb60bf6 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -2118,6 +2118,52 @@ void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to)
}
EXPORT_SYMBOL(skb_copy_and_csum_dev);
+void
+skb_zerocopy(struct sk_buff *to, const struct sk_buff *from, int len, int hlen)
+{
+ int i, j = 0;
+ int plen = 0; /* length of skb->head fragment */
+ struct page *page;
+ unsigned int offset;
+
+ /* dont bother with small payloads */
+ if (len <= skb_tailroom(to)) {
+ skb_copy_bits(from, 0, skb_put(to, len), len);
+ return;
+ }
+
+ if (hlen) {
+ skb_copy_bits(from, 0, skb_put(to, hlen), hlen);
+ len -= hlen;
+ } else {
+ plen = min_t(int, skb_headlen(from), len);
+ if (plen) {
+ page = virt_to_head_page(from->head);
+ offset = from->data - (unsigned char *)page_address(page);
+ __skb_fill_page_desc(to, 0, page, offset, plen);
+ get_page(page);
+ j = 1;
+ len -= plen;
+ }
+ }
+
+ to->truesize += len + plen;
+ to->len += len + plen;
+ to->data_len += len + plen;
+
+ for (i = 0; i < skb_shinfo(from)->nr_frags; i++) {
+ if (!len)
+ break;
+ skb_shinfo(to)->frags[j] = skb_shinfo(from)->frags[i];
+ skb_shinfo(to)->frags[j].size = min_t(int, skb_shinfo(to)->frags[j].size, len);
+ len -= skb_shinfo(to)->frags[j].size;
+ skb_frag_ref(to, j);
+ j++;
+ }
+ skb_shinfo(to)->nr_frags = j;
+}
+EXPORT_SYMBOL_GPL(skb_zerocopy);
+
/**
* skb_dequeue - remove from the head of the queue
* @list: list to dequeue from
diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c
index 2e0e835..7ac9dba 100644
--- a/net/netfilter/nfnetlink_queue_core.c
+++ b/net/netfilter/nfnetlink_queue_core.c
@@ -227,51 +227,6 @@ nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
spin_unlock_bh(&queue->lock);
}
-static void
-nfqnl_zcopy(struct sk_buff *to, const struct sk_buff *from, int len, int hlen)
-{
- int i, j = 0;
- int plen = 0; /* length of skb->head fragment */
- struct page *page;
- unsigned int offset;
-
- /* dont bother with small payloads */
- if (len <= skb_tailroom(to)) {
- skb_copy_bits(from, 0, skb_put(to, len), len);
- return;
- }
-
- if (hlen) {
- skb_copy_bits(from, 0, skb_put(to, hlen), hlen);
- len -= hlen;
- } else {
- plen = min_t(int, skb_headlen(from), len);
- if (plen) {
- page = virt_to_head_page(from->head);
- offset = from->data - (unsigned char *)page_address(page);
- __skb_fill_page_desc(to, 0, page, offset, plen);
- get_page(page);
- j = 1;
- len -= plen;
- }
- }
-
- to->truesize += len + plen;
- to->len += len + plen;
- to->data_len += len + plen;
-
- for (i = 0; i < skb_shinfo(from)->nr_frags; i++) {
- if (!len)
- break;
- skb_shinfo(to)->frags[j] = skb_shinfo(from)->frags[i];
- skb_shinfo(to)->frags[j].size = min_t(int, skb_shinfo(to)->frags[j].size, len);
- len -= skb_shinfo(to)->frags[j].size;
- skb_frag_ref(to, j);
- j++;
- }
- skb_shinfo(to)->nr_frags = j;
-}
-
static int nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet)
{
__u32 flags = 0;
@@ -481,7 +436,7 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
nla->nla_type = NFQA_PAYLOAD;
nla->nla_len = nla_attr_size(data_len);
- nfqnl_zcopy(skb, entskb, data_len, hlen);
+ skb_zerocopy(skb, entskb, data_len, hlen);
}
nlh->nlmsg_len = skb->len;
--
1.7.11.7
--
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