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0f92140468
Implement a memory provider that allocates dmabuf devmem in the form of net_iov. The provider receives a reference to the struct netdev_dmabuf_binding via the pool->mp_priv pointer. The driver needs to set this pointer for the provider in the net_iov. The provider obtains a reference on the netdev_dmabuf_binding which guarantees the binding and the underlying mapping remains alive until the provider is destroyed. Usage of PP_FLAG_DMA_MAP is required for this memory provide such that the page_pool can provide the driver with the dma-addrs of the devmem. Support for PP_FLAG_DMA_SYNC_DEV is omitted for simplicity & p.order != 0. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Kaiyuan Zhang <kaiyuanz@google.com> Signed-off-by: Mina Almasry <almasrymina@google.com> Reviewed-by: Pavel Begunkov <asml.silence@gmail.com> Reviewed-by: Jakub Kicinski <kuba@kernel.org> Link: https://patch.msgid.link/20240910171458.219195-7-almasrymina@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PAGE_POOL_PRIV_H
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#define __PAGE_POOL_PRIV_H
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#include <net/page_pool/helpers.h>
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#include "netmem_priv.h"
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s32 page_pool_inflight(const struct page_pool *pool, bool strict);
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int page_pool_list(struct page_pool *pool);
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void page_pool_detached(struct page_pool *pool);
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void page_pool_unlist(struct page_pool *pool);
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static inline bool
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page_pool_set_dma_addr_netmem(netmem_ref netmem, dma_addr_t addr)
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{
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if (PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA) {
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netmem_set_dma_addr(netmem, addr >> PAGE_SHIFT);
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/* We assume page alignment to shave off bottom bits,
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* if this "compression" doesn't work we need to drop.
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*/
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return addr != (dma_addr_t)netmem_get_dma_addr(netmem)
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<< PAGE_SHIFT;
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}
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netmem_set_dma_addr(netmem, addr);
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return false;
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}
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static inline bool page_pool_set_dma_addr(struct page *page, dma_addr_t addr)
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{
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return page_pool_set_dma_addr_netmem(page_to_netmem(page), addr);
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}
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#if defined(CONFIG_PAGE_POOL)
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void page_pool_set_pp_info(struct page_pool *pool, netmem_ref netmem);
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void page_pool_clear_pp_info(netmem_ref netmem);
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int page_pool_check_memory_provider(struct net_device *dev,
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struct netdev_rx_queue *rxq);
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#else
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static inline void page_pool_set_pp_info(struct page_pool *pool,
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netmem_ref netmem)
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{
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}
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static inline void page_pool_clear_pp_info(netmem_ref netmem)
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{
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}
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static inline int page_pool_check_memory_provider(struct net_device *dev,
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struct netdev_rx_queue *rxq)
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{
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return 0;
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}
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#endif
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#endif
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