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| author | Chris Leech <christopher.leech@intel.com> | 2006-05-23 17:50:37 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-06-17 21:25:46 -0700 |
| commit | de5506e155276d385712c2aa1c2d9a27cd4ed947 (patch) | |
| tree | 219c30dab27b9aef2597d8735dfc19db8454849e /include/linux/dmaengine.h | |
| parent | db21733488f84a596faaad0d05430b3f51804692 (diff) | |
| download | lwn-de5506e155276d385712c2aa1c2d9a27cd4ed947.tar.gz lwn-de5506e155276d385712c2aa1c2d9a27cd4ed947.zip | |
[I/OAT]: Utility functions for offloading sk_buff to iovec copies
Provides for pinning user space pages in memory, copying to iovecs,
and copying from sk_buffs including fragmented and chained sk_buffs.
Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/dmaengine.h')
| -rw-r--r-- | include/linux/dmaengine.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 30781546ac99..78b236ca04f8 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -333,5 +333,27 @@ static inline enum dma_status dma_async_is_complete(dma_cookie_t cookie, int dma_async_device_register(struct dma_device *device); void dma_async_device_unregister(struct dma_device *device); +/* --- Helper iov-locking functions --- */ + +struct dma_page_list { + char *base_address; + int nr_pages; + struct page **pages; +}; + +struct dma_pinned_list { + int nr_iovecs; + struct dma_page_list page_list[0]; +}; + +struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len); +void dma_unpin_iovec_pages(struct dma_pinned_list* pinned_list); + +dma_cookie_t dma_memcpy_to_iovec(struct dma_chan *chan, struct iovec *iov, + struct dma_pinned_list *pinned_list, unsigned char *kdata, size_t len); +dma_cookie_t dma_memcpy_pg_to_iovec(struct dma_chan *chan, struct iovec *iov, + struct dma_pinned_list *pinned_list, struct page *page, + unsigned int offset, size_t len); + #endif /* CONFIG_DMA_ENGINE */ #endif /* DMAENGINE_H */ |