[PATCH 01/24] netmem: Create new type
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: 2022-11-30 22:08:48
Also in:
linux-mm
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
As part of simplifying struct page, create a new netmem type which mirrors the page_pool members in struct page. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> --- include/net/page_pool.h | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+)
diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index 813c93499f20..af6ff8c302a0 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h@@ -50,6 +50,47 @@ PP_FLAG_DMA_SYNC_DEV |\ PP_FLAG_PAGE_FRAG) +/* page_pool used by netstack */ +struct netmem { + unsigned long flags; /* Page flags */ + /** + * @pp_magic: magic value to avoid recycling non + * page_pool allocated pages. + */ + unsigned long pp_magic; + struct page_pool *pp; + unsigned long _pp_mapping_pad; + unsigned long dma_addr; + union { + /** + * dma_addr_upper: might require a 64-bit + * value on 32-bit architectures. + */ + unsigned long dma_addr_upper; + /** + * For frag page support, not supported in + * 32-bit architectures with 64-bit DMA. + */ + atomic_long_t pp_frag_count; + }; + atomic_t _mapcount; + atomic_t _refcount; +}; + +#define NETMEM_MATCH(pg, nm) \ + static_assert(offsetof(struct page, pg) == offsetof(struct netmem, nm)) +NETMEM_MATCH(flags, flags); +NETMEM_MATCH(lru, pp_magic); +NETMEM_MATCH(pp, pp); +NETMEM_MATCH(mapping, _pp_mapping_pad); +NETMEM_MATCH(dma_addr, dma_addr); +NETMEM_MATCH(dma_addr_upper, dma_addr_upper); +NETMEM_MATCH(pp_frag_count, pp_frag_count); +NETMEM_MATCH(_mapcount, _mapcount); +NETMEM_MATCH(_refcount, _refcount); +#undef NETMEM_MATCH +static_assert(sizeof(struct netmem) <= sizeof(struct page)); + /* * Fast allocation side cache array/stack *
--
2.35.1