| Message ID | 20240418113616.1108566-7-aleksander.lobakin@intel.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | net: intel: start The Great Code Dedup + Page Pool for iavf | expand |
On Thu, 18 Apr 2024 at 14:37, Alexander Lobakin <aleksander.lobakin@intel.com> wrote: > > Each driver is responsible for syncing buffers written by HW for CPU > before accessing them. Almost each PP-enabled driver uses the same > pattern, which could be shorthanded into a static inline to make driver > code a little bit more compact. > Introduce a simple helper which performs DMA synchronization for the > size passed from the driver. It can be used even when the pool doesn't > manage DMA-syncs-for-device, just make sure the page has a correct DMA > address set via page_pool_set_dma_addr(). > > Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com> > --- > include/net/page_pool/helpers.h | 24 ++++++++++++++++++++++++ > 1 file changed, 24 insertions(+) > > diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h > index c7bb06750e85..873631c79ab1 100644 > --- a/include/net/page_pool/helpers.h > +++ b/include/net/page_pool/helpers.h > @@ -52,6 +52,8 @@ > #ifndef _NET_PAGE_POOL_HELPERS_H > #define _NET_PAGE_POOL_HELPERS_H > > +#include <linux/dma-mapping.h> > + > #include <net/page_pool/types.h> > > #ifdef CONFIG_PAGE_POOL_STATS > @@ -395,6 +397,28 @@ static inline bool page_pool_set_dma_addr(struct page *page, dma_addr_t addr) > return false; > } > > +/** > + * page_pool_dma_sync_for_cpu - sync Rx page for CPU after it's written by HW > + * @pool: &page_pool the @page belongs to > + * @page: page to sync > + * @offset: offset from page start to "hard" start if using PP frags > + * @dma_sync_size: size of the data written to the page > + * > + * Can be used as a shorthand to sync Rx pages before accessing them in the > + * driver. Caller must ensure the pool was created with ``PP_FLAG_DMA_MAP``. > + * Note that this version performs DMA sync unconditionally, even if the > + * associated PP doesn't perform sync-for-device. > + */ > +static inline void page_pool_dma_sync_for_cpu(const struct page_pool *pool, > + const struct page *page, > + u32 offset, u32 dma_sync_size) > +{ > + dma_sync_single_range_for_cpu(pool->p.dev, > + page_pool_get_dma_addr(page), > + offset + pool->p.offset, dma_sync_size, > + page_pool_get_dma_dir(pool)); > +} > + > static inline bool page_pool_put(struct page_pool *pool) > { > return refcount_dec_and_test(&pool->user_cnt); > -- > 2.44.0 > Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h index c7bb06750e85..873631c79ab1 100644 --- a/include/net/page_pool/helpers.h +++ b/include/net/page_pool/helpers.h @@ -52,6 +52,8 @@ #ifndef _NET_PAGE_POOL_HELPERS_H #define _NET_PAGE_POOL_HELPERS_H +#include <linux/dma-mapping.h> + #include <net/page_pool/types.h> #ifdef CONFIG_PAGE_POOL_STATS @@ -395,6 +397,28 @@ static inline bool page_pool_set_dma_addr(struct page *page, dma_addr_t addr) return false; } +/** + * page_pool_dma_sync_for_cpu - sync Rx page for CPU after it's written by HW + * @pool: &page_pool the @page belongs to + * @page: page to sync + * @offset: offset from page start to "hard" start if using PP frags + * @dma_sync_size: size of the data written to the page + * + * Can be used as a shorthand to sync Rx pages before accessing them in the + * driver. Caller must ensure the pool was created with ``PP_FLAG_DMA_MAP``. + * Note that this version performs DMA sync unconditionally, even if the + * associated PP doesn't perform sync-for-device. + */ +static inline void page_pool_dma_sync_for_cpu(const struct page_pool *pool, + const struct page *page, + u32 offset, u32 dma_sync_size) +{ + dma_sync_single_range_for_cpu(pool->p.dev, + page_pool_get_dma_addr(page), + offset + pool->p.offset, dma_sync_size, + page_pool_get_dma_dir(pool)); +} + static inline bool page_pool_put(struct page_pool *pool) { return refcount_dec_and_test(&pool->user_cnt);
Each driver is responsible for syncing buffers written by HW for CPU before accessing them. Almost each PP-enabled driver uses the same pattern, which could be shorthanded into a static inline to make driver code a little bit more compact. Introduce a simple helper which performs DMA synchronization for the size passed from the driver. It can be used even when the pool doesn't manage DMA-syncs-for-device, just make sure the page has a correct DMA address set via page_pool_set_dma_addr(). Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com> --- include/net/page_pool/helpers.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)