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8ab79ed50c
Convert netmem to be a union of struct page and struct netmem. Overload
the LSB of struct netmem* to indicate that it's a net_iov, otherwise
it's a page.
Currently these entries in struct page are rented by the page_pool and
used exclusively by the net stack:
struct {
unsigned long pp_magic;
struct page_pool *pp;
unsigned long _pp_mapping_pad;
unsigned long dma_addr;
atomic_long_t pp_ref_count;
};
Mirror these (and only these) entries into struct net_iov and implement
netmem helpers that can access these common fields regardless of
whether the underlying type is page or net_iov.
Implement checks for net_iov in netmem helpers which delegate to mm
APIs, to ensure net_iov are never passed to the mm stack.
Signed-off-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20240910171458.219195-6-almasrymina@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
32 lines
727 B
C
32 lines
727 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NETMEM_PRIV_H
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#define __NETMEM_PRIV_H
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static inline unsigned long netmem_get_pp_magic(netmem_ref netmem)
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{
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return __netmem_clear_lsb(netmem)->pp_magic;
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}
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static inline void netmem_or_pp_magic(netmem_ref netmem, unsigned long pp_magic)
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{
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__netmem_clear_lsb(netmem)->pp_magic |= pp_magic;
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}
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static inline void netmem_clear_pp_magic(netmem_ref netmem)
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{
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__netmem_clear_lsb(netmem)->pp_magic = 0;
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}
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static inline void netmem_set_pp(netmem_ref netmem, struct page_pool *pool)
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{
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__netmem_clear_lsb(netmem)->pp = pool;
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}
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static inline void netmem_set_dma_addr(netmem_ref netmem,
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unsigned long dma_addr)
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{
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__netmem_clear_lsb(netmem)->dma_addr = dma_addr;
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}
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#endif
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