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page_pool: constify some read-only function arguments

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There are several functions taking pointers to data they don't modify.
This includes statistics fetching, page and page_pool parameters, etc.
Constify the pointers, so that call sites will be able to pass const
pointers as well.
No functional changes, no visible changes in functions sizes.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Alexander Lobakin 2024-04-18 13:36:11 +02:00 committed by Tony Nguyen
parent a1d6063d9f
commit ef9226cd56
3 changed files with 12 additions and 12 deletions
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10
include/net/page_pool/helpers.h
View File

@ -58,7 +58,7 @@
/* Deprecated driver-facing API, use netlink instead */ /* Deprecated driver-facing API, use netlink instead */
int page_pool_ethtool_stats_get_count(void); int page_pool_ethtool_stats_get_count(void);
u8 *page_pool_ethtool_stats_get_strings(u8 *data); u8 *page_pool_ethtool_stats_get_strings(u8 *data);
u64 *page_pool_ethtool_stats_get(u64 *data, void *stats); u64 *page_pool_ethtool_stats_get(u64 *data, const void *stats);
bool page_pool_get_stats(const struct page_pool *pool, bool page_pool_get_stats(const struct page_pool *pool,
struct page_pool_stats *stats); struct page_pool_stats *stats);
@ -73,7 +73,7 @@ static inline u8 *page_pool_ethtool_stats_get_strings(u8 *data)
return data; return data;
} }
static inline u64 *page_pool_ethtool_stats_get(u64 *data, void *stats) static inline u64 *page_pool_ethtool_stats_get(u64 *data, const void *stats)
{ {
return data; return data;
} }
@ -204,8 +204,8 @@ static inline void *page_pool_dev_alloc_va(struct page_pool *pool,
* Get the stored dma direction. A driver might decide to store this locally * Get the stored dma direction. A driver might decide to store this locally
* and avoid the extra cache line from page_pool to determine the direction. * and avoid the extra cache line from page_pool to determine the direction.
*/ */
static static inline enum dma_data_direction
inline enum dma_data_direction page_pool_get_dma_dir(struct page_pool *pool) page_pool_get_dma_dir(const struct page_pool *pool)
{ {
return pool->p.dma_dir; return pool->p.dma_dir;
} }
@ -370,7 +370,7 @@ static inline void page_pool_free_va(struct page_pool *pool, void *va,
* Fetch the DMA address of the page. The page pool to which the page belongs * Fetch the DMA address of the page. The page pool to which the page belongs
* must had been created with PP_FLAG_DMA_MAP. * must had been created with PP_FLAG_DMA_MAP.
*/ */
static inline dma_addr_t page_pool_get_dma_addr(struct page *page) static inline dma_addr_t page_pool_get_dma_addr(const struct page *page)
{ {
dma_addr_t ret = page->dma_addr; dma_addr_t ret = page->dma_addr;

4
include/net/page_pool/types.h
View File

@ -213,7 +213,7 @@ struct xdp_mem_info;
#ifdef CONFIG_PAGE_POOL #ifdef CONFIG_PAGE_POOL
void page_pool_destroy(struct page_pool *pool); void page_pool_destroy(struct page_pool *pool);
void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *), void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *),
struct xdp_mem_info *mem); const struct xdp_mem_info *mem);
void page_pool_put_page_bulk(struct page_pool *pool, void **data, void page_pool_put_page_bulk(struct page_pool *pool, void **data,
int count); int count);
#else #else
@ -223,7 +223,7 @@ static inline void page_pool_destroy(struct page_pool *pool)
static inline void page_pool_use_xdp_mem(struct page_pool *pool, static inline void page_pool_use_xdp_mem(struct page_pool *pool,
void (*disconnect)(void *), void (*disconnect)(void *),
struct xdp_mem_info *mem) const struct xdp_mem_info *mem)
{ {
} }

10
net/core/page_pool.c
View File

@ -123,9 +123,9 @@ int page_pool_ethtool_stats_get_count(void)
} }
EXPORT_SYMBOL(page_pool_ethtool_stats_get_count); EXPORT_SYMBOL(page_pool_ethtool_stats_get_count);
u64 *page_pool_ethtool_stats_get(u64 *data, void *stats) u64 *page_pool_ethtool_stats_get(u64 *data, const void *stats)
{ {
struct page_pool_stats *pool_stats = stats; const struct page_pool_stats *pool_stats = stats;
*data++ = pool_stats->alloc_stats.fast; *data++ = pool_stats->alloc_stats.fast;
*data++ = pool_stats->alloc_stats.slow; *data++ = pool_stats->alloc_stats.slow;
@ -383,8 +383,8 @@ static struct page *__page_pool_get_cached(struct page_pool *pool)
return page; return page;
} }
static void page_pool_dma_sync_for_device(struct page_pool *pool, static void page_pool_dma_sync_for_device(const struct page_pool *pool,
struct page *page, const struct page *page,
unsigned int dma_sync_size) unsigned int dma_sync_size)
{ {
dma_addr_t dma_addr = page_pool_get_dma_addr(page); dma_addr_t dma_addr = page_pool_get_dma_addr(page);
@ -987,7 +987,7 @@ static void page_pool_release_retry(struct work_struct *wq)
} }
void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *), void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *),
struct xdp_mem_info *mem) const struct xdp_mem_info *mem)
{ {
refcount_inc(&pool->user_cnt); refcount_inc(&pool->user_cnt);
pool->disconnect = disconnect; pool->disconnect = disconnect;