diff options
| author | Byungchul Park <byungchul@sk.com> | 2025-07-21 11:18:25 +0900 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-07-23 17:46:54 -0700 |
| commit | 38a436d4e26487e16ac6c1de17c030b1bef84d83 (patch) | |
| tree | e8edcacb49540ee1916aebb2e31910e329278b9d | |
| parent | f3d85c9ee51036ac7ed129ec16eef5df2192763e (diff) | |
netmem: use netmem_desc instead of page to access ->pp in __netmem_get_pp()
To eliminate the use of the page pool fields in struct page, the page
pool code should use netmem descriptor and APIs instead.
However, __netmem_get_pp() still accesses ->pp via struct page. So
change it to use struct netmem_desc instead, since ->pp no longer will
be available in struct page.
While at it, add a helper, __netmem_to_nmdesc(), that can be used to
unsafely get pointer to netmem_desc backing the netmem_ref, only when
the netmem_ref is always backed by system memory.
Signed-off-by: Byungchul Park <byungchul@sk.com>
Link: https://patch.msgid.link/20250721021835.63939-3-byungchul@sk.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | include/net/netmem.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/include/net/netmem.h b/include/net/netmem.h index 535cf17b9134..097bc74d9555 100644 --- a/include/net/netmem.h +++ b/include/net/netmem.h @@ -247,6 +247,24 @@ static inline unsigned long netmem_pfn_trace(netmem_ref netmem) return page_to_pfn(netmem_to_page(netmem)); } +/** + * __netmem_to_nmdesc - unsafely get pointer to the &netmem_desc backing + * @netmem + * @netmem: netmem reference to convert + * + * Unsafe version that can be used only when @netmem is always backed by + * system memory, performs faster and generates smaller object code (no + * check for the LSB, no WARN). When @netmem points to IOV, provokes + * undefined behaviour. + * + * Return: pointer to the &netmem_desc (garbage if @netmem is not backed + * by system memory). + */ +static inline struct netmem_desc *__netmem_to_nmdesc(netmem_ref netmem) +{ + return (__force struct netmem_desc *)netmem; +} + /* __netmem_clear_lsb - convert netmem_ref to struct net_iov * for access to * common fields. * @netmem: netmem reference to extract as net_iov. @@ -280,7 +298,7 @@ static inline struct net_iov *__netmem_clear_lsb(netmem_ref netmem) */ static inline struct page_pool *__netmem_get_pp(netmem_ref netmem) { - return __netmem_to_page(netmem)->pp; + return __netmem_to_nmdesc(netmem)->pp; } static inline struct page_pool *netmem_get_pp(netmem_ref netmem) |