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Date: Thu, 11 Sep 2008 05:03:09 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
Subject: [PATCH 2/3]: net: Add SKB DMA mapping helper functions.
net: Add SKB DMA mapping helper functions.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
include/linux/skbuff.h | 8 ++++++
net/core/Makefile | 1 +
net/core/skb_dma_map.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 75 insertions(+), 0 deletions(-)
create mode 100644 net/core/skb_dma_map.c
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 4b2be23..aa80ad9 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -359,6 +359,14 @@ struct sk_buff {
#include <asm/system.h>
+#ifdef CONFIG_HAS_DMA
+#include <linux/dma-mapping.h>
+extern int skb_dma_map(struct device *dev, struct sk_buff *skb,
+ enum dma_data_direction dir);
+extern void skb_dma_unmap(struct device *dev, struct sk_buff *skb,
+ enum dma_data_direction dir);
+#endif
+
extern void kfree_skb(struct sk_buff *skb);
extern void __kfree_skb(struct sk_buff *skb);
extern struct sk_buff *__alloc_skb(unsigned int size,
diff --git a/net/core/Makefile b/net/core/Makefile
index b1332f6..26a37cb 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -6,6 +6,7 @@ obj-y := sock.o request_sock.o skbuff.o iovec.o datagram.o stream.o scm.o \
gen_stats.o gen_estimator.o net_namespace.o
obj-$(CONFIG_SYSCTL) += sysctl_net_core.o
+obj-$(CONFIG_HAS_DMA) += skb_dma_map.o
obj-y += dev.o ethtool.o dev_mcast.o dst.o netevent.o \
neighbour.o rtnetlink.o utils.o link_watch.o filter.o
diff --git a/net/core/skb_dma_map.c b/net/core/skb_dma_map.c
new file mode 100644
index 0000000..1f49afc
--- /dev/null
+++ b/net/core/skb_dma_map.c
@@ -0,0 +1,66 @@
+/* skb_dma_map.c: DMA mapping helpers for socket buffers.
+ *
+ * Copyright (C) David S. Miller <davem@...emloft.net>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/skbuff.h>
+
+int skb_dma_map(struct device *dev, struct sk_buff *skb,
+ enum dma_data_direction dir)
+{
+ struct skb_shared_info *sp = skb_shinfo(skb);
+ dma_addr_t map;
+ int i;
+
+ map = dma_map_single(dev, skb->data,
+ skb_headlen(skb), dir);
+ if (dma_mapping_error(dev, map))
+ goto out_err;
+
+ sp->dma_maps[0] = map;
+ for (i = 0; i < sp->nr_frags; i++) {
+ skb_frag_t *fp = &sp->frags[i];
+
+ map = dma_map_page(dev, fp->page, fp->page_offset,
+ fp->size, dir);
+ if (dma_mapping_error(dev, map))
+ goto unwind;
+ sp->dma_maps[i + 1] = map;
+ }
+ sp->num_dma_maps = i + 1;
+
+ return 0;
+
+unwind:
+ while (i-- >= 0) {
+ skb_frag_t *fp = &sp->frags[i];
+
+ dma_unmap_page(dev, sp->dma_maps[i + 1],
+ fp->size, dir);
+ }
+ dma_unmap_single(dev, sp->dma_maps[0],
+ skb_headlen(skb), dir);
+out_err:
+ return -ENOMEM;
+}
+EXPORT_SYMBOL(skb_dma_map);
+
+void skb_dma_unmap(struct device *dev, struct sk_buff *skb,
+ enum dma_data_direction dir)
+{
+ struct skb_shared_info *sp = skb_shinfo(skb);
+ int i;
+
+ dma_unmap_single(dev, sp->dma_maps[0],
+ skb_headlen(skb), dir);
+ for (i = 0; i < sp->nr_frags; i++) {
+ skb_frag_t *fp = &sp->frags[i];
+
+ dma_unmap_page(dev, sp->dma_maps[i + 1],
+ fp->size, dir);
+ }
+}
+EXPORT_SYMBOL(skb_dma_unmap);
--
1.5.6.5.GIT
--
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