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Date: Wed, 11 Jan 2023 04:21:56 +0000
From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
To: Jesper Dangaard Brouer <hawk@...nel.org>,
Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
netdev@...r.kernel.org, linux-mm@...ck.org,
Shakeel Butt <shakeelb@...gle.com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: [PATCH v3 08/26] page_pool: Convert pp_alloc_cache to contain netmem
Change the type here from page to netmem. It works out well to
convert page_pool_refill_alloc_cache() to return a netmem instead
of a page as part of this commit.
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
---
include/net/page_pool.h | 2 +-
net/core/page_pool.c | 52 ++++++++++++++++++++---------------------
2 files changed, 27 insertions(+), 27 deletions(-)
diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index 34d47c10550e..583c13f6f2ab 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -173,7 +173,7 @@ static inline bool netmem_is_pfmemalloc(const struct netmem *nmem)
#define PP_ALLOC_CACHE_REFILL 64
struct pp_alloc_cache {
u32 count;
- struct page *cache[PP_ALLOC_CACHE_SIZE];
+ struct netmem *cache[PP_ALLOC_CACHE_SIZE];
};
struct page_pool_params {
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 8f3f7cc5a2d5..c54217ce6b77 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -229,10 +229,10 @@ void page_pool_return_page(struct page_pool *pool, struct page *page)
}
noinline
-static struct page *page_pool_refill_alloc_cache(struct page_pool *pool)
+static struct netmem *page_pool_refill_alloc_cache(struct page_pool *pool)
{
struct ptr_ring *r = &pool->ring;
- struct page *page;
+ struct netmem *nmem;
int pref_nid; /* preferred NUMA node */
/* Quicker fallback, avoid locks when ring is empty */
@@ -253,49 +253,49 @@ static struct page *page_pool_refill_alloc_cache(struct page_pool *pool)
/* Refill alloc array, but only if NUMA match */
do {
- page = __ptr_ring_consume(r);
- if (unlikely(!page))
+ nmem = __ptr_ring_consume(r);
+ if (unlikely(!nmem))
break;
- if (likely(page_to_nid(page) == pref_nid)) {
- pool->alloc.cache[pool->alloc.count++] = page;
+ if (likely(netmem_nid(nmem) == pref_nid)) {
+ pool->alloc.cache[pool->alloc.count++] = nmem;
} else {
/* NUMA mismatch;
* (1) release 1 page to page-allocator and
* (2) break out to fallthrough to alloc_pages_node.
* This limit stress on page buddy alloactor.
*/
- page_pool_return_page(pool, page);
+ page_pool_return_netmem(pool, nmem);
alloc_stat_inc(pool, waive);
- page = NULL;
+ nmem = NULL;
break;
}
} while (pool->alloc.count < PP_ALLOC_CACHE_REFILL);
/* Return last page */
if (likely(pool->alloc.count > 0)) {
- page = pool->alloc.cache[--pool->alloc.count];
+ nmem = pool->alloc.cache[--pool->alloc.count];
alloc_stat_inc(pool, refill);
}
- return page;
+ return nmem;
}
/* fast path */
static struct page *__page_pool_get_cached(struct page_pool *pool)
{
- struct page *page;
+ struct netmem *nmem;
/* Caller MUST guarantee safe non-concurrent access, e.g. softirq */
if (likely(pool->alloc.count)) {
/* Fast-path */
- page = pool->alloc.cache[--pool->alloc.count];
+ nmem = pool->alloc.cache[--pool->alloc.count];
alloc_stat_inc(pool, fast);
} else {
- page = page_pool_refill_alloc_cache(pool);
+ nmem = page_pool_refill_alloc_cache(pool);
}
- return page;
+ return netmem_page(nmem);
}
static void page_pool_dma_sync_for_device(struct page_pool *pool,
@@ -391,13 +391,13 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
/* Unnecessary as alloc cache is empty, but guarantees zero count */
if (unlikely(pool->alloc.count > 0))
- return pool->alloc.cache[--pool->alloc.count];
+ return netmem_page(pool->alloc.cache[--pool->alloc.count]);
/* Mark empty alloc.cache slots "empty" for alloc_pages_bulk_array */
memset(&pool->alloc.cache, 0, sizeof(void *) * bulk);
nr_pages = alloc_pages_bulk_array_node(gfp, pool->p.nid, bulk,
- pool->alloc.cache);
+ (struct page **)pool->alloc.cache);
if (unlikely(!nr_pages))
return NULL;
@@ -405,7 +405,7 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
* page element have not been (possibly) DMA mapped.
*/
for (i = 0; i < nr_pages; i++) {
- struct netmem *nmem = page_netmem(pool->alloc.cache[i]);
+ struct netmem *nmem = pool->alloc.cache[i];
if ((pp_flags & PP_FLAG_DMA_MAP) &&
unlikely(!page_pool_dma_map(pool, nmem))) {
netmem_put(nmem);
@@ -413,7 +413,7 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
}
page_pool_set_pp_info(pool, nmem);
- pool->alloc.cache[pool->alloc.count++] = netmem_page(nmem);
+ pool->alloc.cache[pool->alloc.count++] = nmem;
/* Track how many pages are held 'in-flight' */
pool->pages_state_hold_cnt++;
trace_page_pool_state_hold(pool, nmem,
@@ -422,7 +422,7 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
/* Return last page */
if (likely(pool->alloc.count > 0)) {
- page = pool->alloc.cache[--pool->alloc.count];
+ page = netmem_page(pool->alloc.cache[--pool->alloc.count]);
alloc_stat_inc(pool, slow);
} else {
page = NULL;
@@ -547,7 +547,7 @@ static bool page_pool_recycle_in_cache(struct page *page,
}
/* Caller MUST have verified/know (page_ref_count(page) == 1) */
- pool->alloc.cache[pool->alloc.count++] = page;
+ pool->alloc.cache[pool->alloc.count++] = page_netmem(page);
recycle_stat_inc(pool, cached);
return true;
}
@@ -785,7 +785,7 @@ static void page_pool_free(struct page_pool *pool)
static void page_pool_empty_alloc_cache_once(struct page_pool *pool)
{
- struct page *page;
+ struct netmem *nmem;
if (pool->destroy_cnt)
return;
@@ -795,8 +795,8 @@ static void page_pool_empty_alloc_cache_once(struct page_pool *pool)
* call concurrently.
*/
while (pool->alloc.count) {
- page = pool->alloc.cache[--pool->alloc.count];
- page_pool_return_page(pool, page);
+ nmem = pool->alloc.cache[--pool->alloc.count];
+ page_pool_return_netmem(pool, nmem);
}
}
@@ -878,15 +878,15 @@ EXPORT_SYMBOL(page_pool_destroy);
/* Caller must provide appropriate safe context, e.g. NAPI. */
void page_pool_update_nid(struct page_pool *pool, int new_nid)
{
- struct page *page;
+ struct netmem *nmem;
trace_page_pool_update_nid(pool, new_nid);
pool->p.nid = new_nid;
/* Flush pool alloc cache, as refill will check NUMA node */
while (pool->alloc.count) {
- page = pool->alloc.cache[--pool->alloc.count];
- page_pool_return_page(pool, page);
+ nmem = pool->alloc.cache[--pool->alloc.count];
+ page_pool_return_netmem(pool, nmem);
}
}
EXPORT_SYMBOL(page_pool_update_nid);
--
2.35.1
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