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Message-ID: <CAC_iWj+3Q7CAS3xH9+zWA7nXdFNSJ-XMKQB3ZT0YvUQ-Q2gMCQ@mail.gmail.com>
Date: Fri, 20 Dec 2024 14:29:19 +0200
From: Ilias Apalodimas <ilias.apalodimas@...aro.org>
To: Yunsheng Lin <linyunsheng@...wei.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
somnath.kotur@...adcom.com, liuyonglong@...wei.com, fanghaiqing@...wei.com,
zhangkun09@...wei.com, Wei Fang <wei.fang@....com>,
Shenwei Wang <shenwei.wang@....com>, Clark Wang <xiaoning.wang@....com>,
Andrew Lunn <andrew+netdev@...n.ch>, Eric Dumazet <edumazet@...gle.com>,
Jeroen de Borst <jeroendb@...gle.com>, Praveen Kaligineedi <pkaligineedi@...gle.com>,
Shailend Chand <shailend@...gle.com>, Tony Nguyen <anthony.l.nguyen@...el.com>,
Przemek Kitszel <przemyslaw.kitszel@...el.com>,
Alexander Lobakin <aleksander.lobakin@...el.com>, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>, Saeed Mahameed <saeedm@...dia.com>,
Leon Romanovsky <leon@...nel.org>, Tariq Toukan <tariqt@...dia.com>, Felix Fietkau <nbd@....name>,
Lorenzo Bianconi <lorenzo@...nel.org>, 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>, Simon Horman <horms@...nel.org>,
imx@...ts.linux.dev, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
intel-wired-lan@...ts.osuosl.org, bpf@...r.kernel.org,
linux-rdma@...r.kernel.org, linux-wireless@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH RFCv5 1/8] page_pool: introduce page_pool_to_pp() API
Hi Yunsheng,
On Fri, 13 Dec 2024 at 14:35, Yunsheng Lin <linyunsheng@...wei.com> wrote:
>
> introduce page_pool_to_pp() API to avoid caller accessing
> page->pp directly.
>
I think we already have way too many abstractions, I'd say we need
less not more. I don't know what others think, but I don't see what we
gain from this
Thanks
/Ilias
> Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
> ---
> drivers/net/ethernet/freescale/fec_main.c | 8 +++++---
> .../net/ethernet/google/gve/gve_buffer_mgmt_dqo.c | 2 +-
> drivers/net/ethernet/intel/iavf/iavf_txrx.c | 6 ++++--
> drivers/net/ethernet/intel/idpf/idpf_txrx.c | 14 +++++++++-----
> drivers/net/ethernet/intel/libeth/rx.c | 2 +-
> drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c | 3 ++-
> drivers/net/netdevsim/netdev.c | 6 ++++--
> drivers/net/wireless/mediatek/mt76/mt76.h | 2 +-
> include/net/libeth/rx.h | 3 ++-
> include/net/page_pool/helpers.h | 5 +++++
> net/core/skbuff.c | 3 ++-
> net/core/xdp.c | 3 ++-
> 12 files changed, 38 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> index 1b55047c0237..98fce41d088c 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -1009,7 +1009,8 @@ static void fec_enet_bd_init(struct net_device *dev)
> struct page *page = txq->tx_buf[i].buf_p;
>
> if (page)
> - page_pool_put_page(page->pp, page, 0, false);
> + page_pool_put_page(page_pool_to_pp(page),
> + page, 0, false);
> }
>
> txq->tx_buf[i].buf_p = NULL;
> @@ -1549,7 +1550,7 @@ fec_enet_tx_queue(struct net_device *ndev, u16 queue_id, int budget)
> xdp_return_frame_rx_napi(xdpf);
> } else { /* recycle pages of XDP_TX frames */
> /* The dma_sync_size = 0 as XDP_TX has already synced DMA for_device */
> - page_pool_put_page(page->pp, page, 0, true);
> + page_pool_put_page(page_pool_to_pp(page), page, 0, true);
> }
>
> txq->tx_buf[index].buf_p = NULL;
> @@ -3311,7 +3312,8 @@ static void fec_enet_free_buffers(struct net_device *ndev)
> } else {
> struct page *page = txq->tx_buf[i].buf_p;
>
> - page_pool_put_page(page->pp, page, 0, false);
> + page_pool_put_page(page_pool_to_pp(page),
> + page, 0, false);
> }
>
> txq->tx_buf[i].buf_p = NULL;
> diff --git a/drivers/net/ethernet/google/gve/gve_buffer_mgmt_dqo.c b/drivers/net/ethernet/google/gve/gve_buffer_mgmt_dqo.c
> index 403f0f335ba6..db5926152c72 100644
> --- a/drivers/net/ethernet/google/gve/gve_buffer_mgmt_dqo.c
> +++ b/drivers/net/ethernet/google/gve/gve_buffer_mgmt_dqo.c
> @@ -210,7 +210,7 @@ void gve_free_to_page_pool(struct gve_rx_ring *rx,
> if (!page)
> return;
>
> - page_pool_put_full_page(page->pp, page, allow_direct);
> + page_pool_put_full_page(page_pool_to_pp(page), page, allow_direct);
> buf_state->page_info.page = NULL;
> }
>
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
> index 26b424fd6718..658d8f9a6abb 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_txrx.c
> +++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
> @@ -1050,7 +1050,8 @@ static void iavf_add_rx_frag(struct sk_buff *skb,
> const struct libeth_fqe *rx_buffer,
> unsigned int size)
> {
> - u32 hr = rx_buffer->page->pp->p.offset;
> + struct page_pool *pool = page_pool_to_pp(rx_buffer->page);
> + u32 hr = pool->p.offset;
>
> skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buffer->page,
> rx_buffer->offset + hr, size, rx_buffer->truesize);
> @@ -1067,7 +1068,8 @@ static void iavf_add_rx_frag(struct sk_buff *skb,
> static struct sk_buff *iavf_build_skb(const struct libeth_fqe *rx_buffer,
> unsigned int size)
> {
> - u32 hr = rx_buffer->page->pp->p.offset;
> + struct page_pool *pool = page_pool_to_pp(rx_buffer->page);
> + u32 hr = pool->p.offset;
> struct sk_buff *skb;
> void *va;
>
> diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
> index da2a5becf62f..38ad32678bcc 100644
> --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c
> +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
> @@ -385,7 +385,8 @@ static void idpf_rx_page_rel(struct libeth_fqe *rx_buf)
> if (unlikely(!rx_buf->page))
> return;
>
> - page_pool_put_full_page(rx_buf->page->pp, rx_buf->page, false);
> + page_pool_put_full_page(page_pool_to_pp(rx_buf->page), rx_buf->page,
> + false);
>
> rx_buf->page = NULL;
> rx_buf->offset = 0;
> @@ -3097,7 +3098,8 @@ idpf_rx_process_skb_fields(struct idpf_rx_queue *rxq, struct sk_buff *skb,
> void idpf_rx_add_frag(struct idpf_rx_buf *rx_buf, struct sk_buff *skb,
> unsigned int size)
> {
> - u32 hr = rx_buf->page->pp->p.offset;
> + struct page_pool *pool = page_pool_to_pp(rx_buf->page);
> + u32 hr = pool->p.offset;
>
> skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buf->page,
> rx_buf->offset + hr, size, rx_buf->truesize);
> @@ -3129,8 +3131,10 @@ static u32 idpf_rx_hsplit_wa(const struct libeth_fqe *hdr,
> if (!libeth_rx_sync_for_cpu(buf, copy))
> return 0;
>
> - dst = page_address(hdr->page) + hdr->offset + hdr->page->pp->p.offset;
> - src = page_address(buf->page) + buf->offset + buf->page->pp->p.offset;
> + dst = page_address(hdr->page) + hdr->offset +
> + page_pool_to_pp(hdr->page)->p.offset;
> + src = page_address(buf->page) + buf->offset +
> + page_pool_to_pp(buf->page)->p.offset;
> memcpy(dst, src, LARGEST_ALIGN(copy));
>
> buf->offset += copy;
> @@ -3148,7 +3152,7 @@ static u32 idpf_rx_hsplit_wa(const struct libeth_fqe *hdr,
> */
> struct sk_buff *idpf_rx_build_skb(const struct libeth_fqe *buf, u32 size)
> {
> - u32 hr = buf->page->pp->p.offset;
> + u32 hr = page_pool_to_pp(buf->page)->p.offset;
> struct sk_buff *skb;
> void *va;
>
> diff --git a/drivers/net/ethernet/intel/libeth/rx.c b/drivers/net/ethernet/intel/libeth/rx.c
> index f20926669318..385afca0e61d 100644
> --- a/drivers/net/ethernet/intel/libeth/rx.c
> +++ b/drivers/net/ethernet/intel/libeth/rx.c
> @@ -207,7 +207,7 @@ EXPORT_SYMBOL_NS_GPL(libeth_rx_fq_destroy, LIBETH);
> */
> void libeth_rx_recycle_slow(struct page *page)
> {
> - page_pool_recycle_direct(page->pp, page);
> + page_pool_recycle_direct(page_pool_to_pp(page), page);
> }
> EXPORT_SYMBOL_NS_GPL(libeth_rx_recycle_slow, LIBETH);
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
> index 94b291662087..78866b5473da 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
> @@ -716,7 +716,8 @@ static void mlx5e_free_xdpsq_desc(struct mlx5e_xdpsq *sq,
> /* No need to check ((page->pp_magic & ~0x3UL) == PP_SIGNATURE)
> * as we know this is a page_pool page.
> */
> - page_pool_recycle_direct(page->pp, page);
> + page_pool_recycle_direct(page_pool_to_pp(page),
> + page);
> } while (++n < num);
>
> break;
> diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
> index 0be47fed4efc..088f4836a0e2 100644
> --- a/drivers/net/netdevsim/netdev.c
> +++ b/drivers/net/netdevsim/netdev.c
> @@ -632,7 +632,8 @@ nsim_pp_hold_write(struct file *file, const char __user *data,
> if (!ns->page)
> ret = -ENOMEM;
> } else {
> - page_pool_put_full_page(ns->page->pp, ns->page, false);
> + page_pool_put_full_page(page_pool_to_pp(ns->page), ns->page,
> + false);
> ns->page = NULL;
> }
> rtnl_unlock();
> @@ -831,7 +832,8 @@ void nsim_destroy(struct netdevsim *ns)
>
> /* Put this intentionally late to exercise the orphaning path */
> if (ns->page) {
> - page_pool_put_full_page(ns->page->pp, ns->page, false);
> + page_pool_put_full_page(page_pool_to_pp(ns->page), ns->page,
> + false);
> ns->page = NULL;
> }
>
> diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
> index 0b75a45ad2e8..94a277290909 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt76.h
> +++ b/drivers/net/wireless/mediatek/mt76/mt76.h
> @@ -1688,7 +1688,7 @@ static inline void mt76_put_page_pool_buf(void *buf, bool allow_direct)
> {
> struct page *page = virt_to_head_page(buf);
>
> - page_pool_put_full_page(page->pp, page, allow_direct);
> + page_pool_put_full_page(page_pool_to_pp(page), page, allow_direct);
> }
>
> static inline void *
> diff --git a/include/net/libeth/rx.h b/include/net/libeth/rx.h
> index 43574bd6612f..beee7ddd77a5 100644
> --- a/include/net/libeth/rx.h
> +++ b/include/net/libeth/rx.h
> @@ -137,7 +137,8 @@ static inline bool libeth_rx_sync_for_cpu(const struct libeth_fqe *fqe,
> return false;
> }
>
> - page_pool_dma_sync_for_cpu(page->pp, page, fqe->offset, len);
> + page_pool_dma_sync_for_cpu(page_pool_to_pp(page), page, fqe->offset,
> + len);
>
> return true;
> }
> diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h
> index 793e6fd78bc5..1659f1995985 100644
> --- a/include/net/page_pool/helpers.h
> +++ b/include/net/page_pool/helpers.h
> @@ -83,6 +83,11 @@ static inline u64 *page_pool_ethtool_stats_get(u64 *data, const void *stats)
> }
> #endif
>
> +static inline struct page_pool *page_pool_to_pp(struct page *page)
> +{
> + return page->pp;
> +}
> +
> /**
> * page_pool_dev_alloc_pages() - allocate a page.
> * @pool: pool from which to allocate
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index 6841e61a6bd0..54e8e7cf2bc9 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -1033,7 +1033,8 @@ bool napi_pp_put_page(netmem_ref netmem)
> if (unlikely(!is_pp_netmem(netmem)))
> return false;
>
> - page_pool_put_full_netmem(netmem_get_pp(netmem), netmem, false);
> + page_pool_put_full_netmem(page_pool_to_pp(netmem_to_page(netmem)),
> + netmem, false);
>
> return true;
> }
> diff --git a/net/core/xdp.c b/net/core/xdp.c
> index bcc5551c6424..e8582036b411 100644
> --- a/net/core/xdp.c
> +++ b/net/core/xdp.c
> @@ -384,7 +384,8 @@ void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct,
> /* No need to check ((page->pp_magic & ~0x3UL) == PP_SIGNATURE)
> * as mem->type knows this a page_pool page
> */
> - page_pool_put_full_page(page->pp, page, napi_direct);
> + page_pool_put_full_page(page_pool_to_pp(page), page,
> + napi_direct);
> break;
> case MEM_TYPE_PAGE_SHARED:
> page_frag_free(data);
> --
> 2.33.0
>
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