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Message-ID: <20230516124801.2465-4-linyunsheng@huawei.com>
Date: Tue, 16 May 2023 20:48:01 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Yunsheng Lin <linyunsheng@...wei.com>,
Lorenzo Bianconi <lorenzo@...nel.org>,
Alexander Duyck <alexander.duyck@...il.com>,
Yisen Zhuang <yisen.zhuang@...wei.com>,
Salil Mehta <salil.mehta@...wei.com>,
Eric Dumazet <edumazet@...gle.com>,
Felix Fietkau <nbd@....name>,
Ryder Lee <ryder.lee@...iatek.com>,
Shayne Chen <shayne.chen@...iatek.com>,
Sean Wang <sean.wang@...iatek.com>,
Kalle Valo <kvalo@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Jesper Dangaard Brouer <hawk@...nel.org>,
Ilias Apalodimas <ilias.apalodimas@...aro.org>,
<linux-wireless@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>
Subject: [RFC 3/3] page_pool: introduce 'struct page_pool_frag'
As page_pool_alloc_frag() can return both frag and non-frag
page now, the true size may be different for them, so introduce
'struct page_pool_frag' to return the frag info instead of
adding more function parameters and adjust the interface
accordingly.
Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
CC: Lorenzo Bianconi <lorenzo@...nel.org>
CC: Alexander Duyck <alexander.duyck@...il.com>
---
.../net/ethernet/hisilicon/hns3/hns3_enet.c | 16 ++++----
drivers/net/wireless/mediatek/mt76/mt76.h | 9 +++--
include/net/page_pool.h | 18 ++++++---
net/core/page_pool.c | 38 +++++++++++++------
4 files changed, 52 insertions(+), 29 deletions(-)
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index b676496ec6d7..b7290c3bb26b 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -3355,15 +3355,17 @@ static int hns3_alloc_buffer(struct hns3_enet_ring *ring,
struct page *p;
if (ring->page_pool) {
- p = page_pool_dev_alloc_frag(ring->page_pool,
- &cb->page_offset,
- hns3_buf_size(ring));
- if (unlikely(!p))
+ struct page_pool_frag *pp_frag;
+
+ pp_frag = page_pool_dev_alloc_frag(ring->page_pool,
+ hns3_buf_size(ring));
+ if (unlikely(!pp_frag))
return -ENOMEM;
- cb->priv = p;
- cb->buf = page_address(p);
- cb->dma = page_pool_get_dma_addr(p);
+ cb->priv = pp_frag->page;
+ cb->page_offset = pp_frag->offset;
+ cb->buf = page_address(pp_frag->page);
+ cb->dma = page_pool_get_dma_addr(pp_frag->page);
cb->type = DESC_TYPE_PP_FRAG;
cb->reuse_flag = 0;
return 0;
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 6b07b8fafec2..5d42081f7ba8 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -1453,13 +1453,14 @@ static inline void mt76_put_page_pool_buf(void *buf, bool allow_direct)
static inline void *
mt76_get_page_pool_buf(struct mt76_queue *q, u32 *offset, u32 size)
{
- struct page *page;
+ struct page_pool_frag *pp_frag;
- page = page_pool_dev_alloc_frag(q->page_pool, offset, size);
- if (!page)
+ pp_frag = page_pool_dev_alloc_frag(q->page_pool, size);
+ if (!pp_frag)
return NULL;
- return page_address(page) + *offset;
+ *offset = pp_frag->offset;
+ return page_address(pp_frag->page) + *offset;
}
static inline void mt76_set_tx_blocked(struct mt76_dev *dev, bool blocked)
diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index d1c57c0c8f49..86e79ea87732 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -151,6 +151,12 @@ static inline u64 *page_pool_ethtool_stats_get(u64 *data, void *stats)
#endif
+struct page_pool_frag {
+ struct page *page;
+ unsigned int offset;
+ unsigned int truesize;
+};
+
struct page_pool {
struct page_pool_params p;
@@ -231,16 +237,16 @@ static inline struct page *page_pool_dev_alloc_pages(struct page_pool *pool)
return page_pool_alloc_pages(pool, gfp);
}
-struct page *page_pool_alloc_frag(struct page_pool *pool, unsigned int *offset,
- unsigned int size, gfp_t gfp);
+struct page_pool_frag *page_pool_alloc_frag(struct page_pool *pool,
+ unsigned int size, gfp_t gfp);
-static inline struct page *page_pool_dev_alloc_frag(struct page_pool *pool,
- unsigned int *offset,
- unsigned int size)
+static inline
+struct page_pool_frag *page_pool_dev_alloc_frag(struct page_pool *pool,
+ unsigned int size)
{
gfp_t gfp = (GFP_ATOMIC | __GFP_NOWARN);
- return page_pool_alloc_frag(pool, offset, size, gfp);
+ return page_pool_alloc_frag(pool, size, gfp);
}
/* get the stored dma direction. A driver might decide to treat this locally and
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index aab6147f28af..83a2a85d21bf 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -28,6 +28,8 @@
#define BIAS_MAX LONG_MAX
+static DEFINE_PER_CPU(struct page_pool_frag, pp_frag);
+
#ifdef CONFIG_PAGE_POOL_STATS
/* alloc_stat_inc is intended to be used in softirq context */
#define alloc_stat_inc(pool, __stat) (pool->alloc_stats.__stat++)
@@ -694,25 +696,31 @@ static void page_pool_free_frag(struct page_pool *pool)
page_pool_return_page(pool, page);
}
-struct page *page_pool_alloc_frag(struct page_pool *pool,
- unsigned int *offset,
- unsigned int size, gfp_t gfp)
+struct page_pool_frag *page_pool_alloc_frag(struct page_pool *pool,
+ unsigned int size,
+ gfp_t gfp)
{
+ struct page_pool_frag *frag = this_cpu_ptr(&pp_frag);
unsigned int max_size = PAGE_SIZE << pool->p.order;
- struct page *page = pool->frag_page;
+ struct page *page;
if (WARN_ON(PAGE_POOL_DMA_USE_PP_FRAG_COUNT))
return NULL;
if (unlikely(size > pool->max_frag_size)) {
- *offset = 0;
- return page_pool_alloc_pages(pool, gfp);
+ frag->page = page_pool_alloc_pages(pool, gfp);
+ if (unlikely(!frag->page))
+ return NULL;
+
+ frag->offset = 0;
+ frag->truesize = max_size;
+ return frag;
}
+ page = pool->frag_page;
size = ALIGN(size, dma_get_cache_alignment());
- *offset = pool->frag_offset;
- if (page && *offset + size > max_size) {
+ if (page && pool->frag_offset + size > max_size) {
page = page_pool_drain_frag(pool, page);
if (page) {
alloc_stat_inc(pool, fast);
@@ -731,16 +739,22 @@ struct page *page_pool_alloc_frag(struct page_pool *pool,
frag_reset:
pool->frag_users = 1;
- *offset = 0;
pool->frag_offset = size;
page_pool_fragment_page(page, BIAS_MAX);
- return page;
+ frag->page = page;
+ frag->offset = 0;
+ frag->truesize = size;
+ return frag;
}
+ frag->page = page;
+ frag->truesize = size;
+ frag->offset = pool->frag_offset;
+
pool->frag_users++;
- pool->frag_offset = *offset + size;
+ pool->frag_offset += size;
alloc_stat_inc(pool, fast);
- return page;
+ return frag;
}
EXPORT_SYMBOL(page_pool_alloc_frag);
--
2.33.0
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