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author | Ingo Molnar <mingo@elte.hu> | 2008-10-12 10:39:30 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-10-12 10:39:50 (GMT) |
commit | 4c7145a1ec1bb789d5f07e47510e8bda546a7c4a (patch) | |
tree | e2767b77e5413473a3bba302237f4669a203f183 /net/core/skb_dma_map.c | |
parent | 74e91604b2452c15bbe72d77b37cf47ed0310d13 (diff) | |
parent | fd048088306656824958e7783ffcee27e241b361 (diff) | |
download | linux-fsl-qoriq-4c7145a1ec1bb789d5f07e47510e8bda546a7c4a.tar.xz |
Merge branch 'linus' into x86/spinlocks
Done to prevent this failure of an Octopus merge:
Added arch/arm/include/asm/byteorder.h in both, but differently.
ERROR: Merge conflict in arch/arm/include/asm/byteorder.h
Auto-merging include/asm-x86/spinlock.h
ERROR: Merge conflict in include/asm-x86/spinlock.h
fatal: merge program failed
Diffstat (limited to 'net/core/skb_dma_map.c')
-rw-r--r-- | net/core/skb_dma_map.c | 66 |
1 files changed, 66 insertions, 0 deletions
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@davemloft.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); |