forked from mirrors/linux
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>
44 lines
964 B
C
44 lines
964 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Dmabuf device memory provider.
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*
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* Authors: Mina Almasry <almasrymina@google.com>
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*
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*/
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#ifndef _NET_MP_DMABUF_DEVMEM_H
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#define _NET_MP_DMABUF_DEVMEM_H
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#include <net/netmem.h>
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#if defined(CONFIG_NET_DEVMEM)
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int mp_dmabuf_devmem_init(struct page_pool *pool);
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netmem_ref mp_dmabuf_devmem_alloc_netmems(struct page_pool *pool, gfp_t gfp);
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void mp_dmabuf_devmem_destroy(struct page_pool *pool);
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bool mp_dmabuf_devmem_release_page(struct page_pool *pool, netmem_ref netmem);
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#else
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static inline int mp_dmabuf_devmem_init(struct page_pool *pool)
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{
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return -EOPNOTSUPP;
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}
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static inline netmem_ref
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mp_dmabuf_devmem_alloc_netmems(struct page_pool *pool, gfp_t gfp)
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{
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return 0;
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}
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static inline void mp_dmabuf_devmem_destroy(struct page_pool *pool)
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{
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}
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static inline bool
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mp_dmabuf_devmem_release_page(struct page_pool *pool, netmem_ref netmem)
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{
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return false;
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}
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#endif
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#endif /* _NET_MP_DMABUF_DEVMEM_H */
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