netdev - [RFC PATCH v4 01/16] net: generalise pp provider params passing

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Date: Tue, 12 Mar 2024 14:44:15 -0700
From: David Wei <dw@...idwei.uk>
To: io-uring@...r.kernel.org,
	netdev@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>,
	Pavel Begunkov <asml.silence@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	David Ahern <dsahern@...nel.org>,
	Mina Almasry <almasrymina@...gle.com>
Subject: [RFC PATCH v4 01/16] net: generalise pp provider params passing

From: Pavel Begunkov <asml.silence@...il.com>

RFC only, not for upstream

Add a way to pass custom page pool parameters, but the final version
should converge with devmem.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
Signed-off-by: David Wei <dw@...idwei.uk>
---
 include/net/netdev_rx_queue.h | 3 +++
 net/core/dev.c                | 2 +-
 net/core/page_pool.c          | 3 +++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/net/netdev_rx_queue.h b/include/net/netdev_rx_queue.h
index 5dc35628633a..41f8c4e049bb 100644
--- a/include/net/netdev_rx_queue.h
+++ b/include/net/netdev_rx_queue.h
@@ -26,6 +26,9 @@ struct netdev_rx_queue {
 	 */
 	struct napi_struct		*napi;
 	struct netdev_dmabuf_binding *binding;
+
+	const struct memory_provider_ops	*pp_ops;
+	void					*pp_private;
 } ____cacheline_aligned_in_smp;
 
 /*
diff --git a/net/core/dev.c b/net/core/dev.c
index 255a38cf59b1..2096ff57685a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2189,7 +2189,7 @@ int netdev_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx,
 
 	rxq = __netif_get_rx_queue(dev, rxq_idx);
 
-	if (rxq->binding)
+	if (rxq->binding || rxq->pp_ops)
 		return -EEXIST;
 
 	err = xa_alloc(&binding->bound_rxq_list, &xa_idx, rxq, xa_limit_32b,
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 53039d2f8514..5d5b78878473 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -262,6 +262,9 @@ static int page_pool_init(struct page_pool *pool,
 	if (binding) {
 		pool->mp_ops = &dmabuf_devmem_ops;
 		pool->mp_priv = binding;
+	} else if (pool->p.queue && pool->p.queue->pp_ops) {
+		pool->mp_ops = pool->p.queue->pp_ops;
+		pool->mp_priv = pool->p.queue->pp_private;
 	}
 
 	if (pool->mp_ops) {
-- 
2.43.0