Re: [net-next v1 08/16] memory-provider: dmabuf devmem memory provider

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On 12/8/23 00:52, Mina Almasry wrote:
Implement a memory provider that allocates dmabuf devmem page_pool_iovs.

The provider receives a reference to the struct netdev_dmabuf_binding
via the pool->mp_priv pointer. The driver needs to set this pointer for
the provider in the page_pool_params.

The provider obtains a reference on the netdev_dmabuf_binding which
guarantees the binding and the underlying mapping remains alive until
the provider is destroyed.

Usage of PP_FLAG_DMA_MAP is required for this memory provide such that
the page_pool can provide the driver with the dma-addrs of the devmem.

Support for PP_FLAG_DMA_SYNC_DEV is omitted for simplicity.

Signed-off-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: Kaiyuan Zhang <kaiyuanz@xxxxxxxxxx>
Signed-off-by: Mina Almasry <almasrymina@xxxxxxxxxx>

---

v1:
- static_branch check in page_is_page_pool_iov() (Willem & Paolo).
- PP_DEVMEM -> PP_IOV (David).
- Require PP_FLAG_DMA_MAP (Jakub).

---
  include/net/page_pool/helpers.h | 47 +++++++++++++++++
  include/net/page_pool/types.h   |  9 ++++
  net/core/page_pool.c            | 89 ++++++++++++++++++++++++++++++++-
  3 files changed, 144 insertions(+), 1 deletion(-)

diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h
index 8bfc2d43efd4..00197f14aa87 100644
--- a/include/net/page_pool/helpers.h
+++ b/include/net/page_pool/helpers.h
@@ -53,6 +53,8 @@
  #define _NET_PAGE_POOL_HELPERS_H
#include <net/page_pool/types.h>
+#include <net/net_debug.h>
+#include <net/devmem.h>
#ifdef CONFIG_PAGE_POOL_STATS
  /* Deprecated driver-facing API, use netlink instead */
@@ -92,6 +94,11 @@ static inline unsigned int page_pool_iov_idx(const struct page_pool_iov *ppiov)
  	return ppiov - page_pool_iov_owner(ppiov)->ppiovs;
  }
+static inline u32 page_pool_iov_binding_id(const struct page_pool_iov *ppiov)
+{
+	return page_pool_iov_owner(ppiov)->binding->id;
+}
+
  static inline dma_addr_t
  page_pool_iov_dma_addr(const struct page_pool_iov *ppiov)
  {
@@ -107,6 +114,46 @@ page_pool_iov_binding(const struct page_pool_iov *ppiov)
  	return page_pool_iov_owner(ppiov)->binding;
  }
+static inline int page_pool_iov_refcount(const struct page_pool_iov *ppiov)
+{
+	return refcount_read(&ppiov->refcount);
+}
+
+static inline void page_pool_iov_get_many(struct page_pool_iov *ppiov,
+					  unsigned int count)
+{
+	refcount_add(count, &ppiov->refcount);
+}
+
+void __page_pool_iov_free(struct page_pool_iov *ppiov);
+
+static inline void page_pool_iov_put_many(struct page_pool_iov *ppiov,
+					  unsigned int count)
+{
+	if (!refcount_sub_and_test(count, &ppiov->refcount))
+		return;
+
+	__page_pool_iov_free(ppiov);
+}
+
+/* page pool mm helpers */
+
+DECLARE_STATIC_KEY_FALSE(page_pool_mem_providers);
+static inline bool page_is_page_pool_iov(const struct page *page)
+{
+	return static_branch_unlikely(&page_pool_mem_providers) &&
+	       (unsigned long)page & PP_IOV;
+}
+
+static inline struct page_pool_iov *page_to_page_pool_iov(struct page *page)
+{
+	if (page_is_page_pool_iov(page))
+		return (struct page_pool_iov *)((unsigned long)page & ~PP_IOV);
+
+	DEBUG_NET_WARN_ON_ONCE(true);
+	return NULL;
+}
+
  /**
   * page_pool_dev_alloc_pages() - allocate a page.
   * @pool:	pool from which to allocate
diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h
index 44faee7a7b02..136930a238de 100644
--- a/include/net/page_pool/types.h
+++ b/include/net/page_pool/types.h
@@ -134,8 +134,15 @@ struct memory_provider_ops {
  	bool (*release_page)(struct page_pool *pool, struct page *page);
  };
+extern const struct memory_provider_ops dmabuf_devmem_ops;
+
  /* page_pool_iov support */
+/* We overload the LSB of the struct page pointer to indicate whether it's
+ *  a page or page_pool_iov.
+ */
+#define PP_IOV 0x01UL
+
  /* Owner of the dma-buf chunks inserted into the gen pool. Each scatterlist
   * entry from the dmabuf is inserted into the genpool as a chunk, and needs
   * this owner struct to keep track of some metadata necessary to create
@@ -159,6 +166,8 @@ struct page_pool_iov {
  	struct dmabuf_genpool_chunk_owner *owner;
refcount_t refcount;
+
+	struct page_pool *pp;
  };
struct page_pool {
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index f5c84d2a4510..423c88564a00 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -12,6 +12,7 @@
#include <net/page_pool/helpers.h>
  #include <net/xdp.h>
+#include <net/netdev_rx_queue.h>
#include <linux/dma-direction.h>
  #include <linux/dma-mapping.h>
@@ -20,12 +21,15 @@
  #include <linux/poison.h>
  #include <linux/ethtool.h>
  #include <linux/netdevice.h>
+#include <linux/genalloc.h>
+#include <net/devmem.h>
#include <trace/events/page_pool.h> #include "page_pool_priv.h" -static DEFINE_STATIC_KEY_FALSE(page_pool_mem_providers);
+DEFINE_STATIC_KEY_FALSE(page_pool_mem_providers);
+EXPORT_SYMBOL(page_pool_mem_providers);
#define DEFER_TIME (msecs_to_jiffies(1000))
  #define DEFER_WARN_INTERVAL (60 * HZ)
@@ -175,6 +179,7 @@ static void page_pool_producer_unlock(struct page_pool *pool,
  static int page_pool_init(struct page_pool *pool,
  			  const struct page_pool_params *params)
  {
+	struct netdev_dmabuf_binding *binding = NULL;
  	unsigned int ring_qsize = 1024; /* Default */
  	int err;
@@ -237,6 +242,14 @@ static int page_pool_init(struct page_pool *pool,
  	/* Driver calling page_pool_create() also call page_pool_destroy() */
  	refcount_set(&pool->user_cnt, 1);
+ if (pool->p.queue)
+		binding = READ_ONCE(pool->p.queue->binding);
+
+	if (binding) {
+		pool->mp_ops = &dmabuf_devmem_ops;
+		pool->mp_priv = binding;
+	}

Hmm, I don't understand why would we replace a nice transparent
api with page pool relying on a queue having devmem specific
pointer? It seemed more flexible and cleaner in the last RFC.

+
  	if (pool->mp_ops) {
  		err = pool->mp_ops->init(pool);
  		if (err) {
@@ -1020,3 +1033,77 @@ void page_pool_update_nid(struct page_pool *pool, int new_nid)
  	}
  }
  EXPORT_SYMBOL(page_pool_update_nid);
+
+void __page_pool_iov_free(struct page_pool_iov *ppiov)
+{
+	if (WARN_ON(ppiov->pp->mp_ops != &dmabuf_devmem_ops))
+		return;
+
+	netdev_free_dmabuf(ppiov);
+}
+EXPORT_SYMBOL_GPL(__page_pool_iov_free);

I didn't look too deep but I don't think I immediately follow
the pp refcounting. It increments pages_state_hold_cnt on
allocation, but IIUC doesn't mark skbs for recycle? Then, they all
will be put down via page_pool_iov_put_many() bypassing
page_pool_return_page() and friends. That will call
netdev_free_dmabuf(), which doesn't bump pages_state_release_cnt.

At least I couldn't make it work with io_uring, and for my purposes,
I forced all puts to go through page_pool_return_page(), which calls
the ->release_page callback. The callback will put the reference and
ask its page pool to account release_cnt. It also gets rid of
__page_pool_iov_free(), as we'd need to add a hook there for
customization otherwise.

I didn't care about overhead because the hot path for me is getting
buffers from a ring, which is somewhat analogous to sock_devmem_dontneed(),
but done on pp allocations under napi, and it's done separately.

Completely untested with TCP devmem:

https://github.com/isilence/linux/commit/14bd56605183dc80b540999e8058c79ac92ae2d8

+
+/*** "Dmabuf devmem memory provider" ***/
+
+static int mp_dmabuf_devmem_init(struct page_pool *pool)
+{
+	struct netdev_dmabuf_binding *binding = pool->mp_priv;
+
+	if (!binding)
+		return -EINVAL;
+
+	if (!(pool->p.flags & PP_FLAG_DMA_MAP))
+		return -EOPNOTSUPP;
+
+	if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV)
+		return -EOPNOTSUPP;
+
+	netdev_dmabuf_binding_get(binding);
+	return 0;
+}
+
+static struct page *mp_dmabuf_devmem_alloc_pages(struct page_pool *pool,
+						 gfp_t gfp)
+{
+	struct netdev_dmabuf_binding *binding = pool->mp_priv;
+	struct page_pool_iov *ppiov;
+
+	ppiov = netdev_alloc_dmabuf(binding);
+	if (!ppiov)
+		return NULL;
+
+	ppiov->pp = pool;
+	pool->pages_state_hold_cnt++;
+	trace_page_pool_state_hold(pool, (struct page *)ppiov,
+				   pool->pages_state_hold_cnt);
+	return (struct page *)((unsigned long)ppiov | PP_IOV);
+}
+
+static void mp_dmabuf_devmem_destroy(struct page_pool *pool)
+{
+	struct netdev_dmabuf_binding *binding = pool->mp_priv;
+
+	netdev_dmabuf_binding_put(binding);
+}
+
+static bool mp_dmabuf_devmem_release_page(struct page_pool *pool,
+					  struct page *page)
+{
+	struct page_pool_iov *ppiov;
+
+	if (WARN_ON_ONCE(!page_is_page_pool_iov(page)))
+		return false;
+
+	ppiov = page_to_page_pool_iov(page);
+	page_pool_iov_put_many(ppiov, 1);
+	/* We don't want the page pool put_page()ing our page_pool_iovs. */
+	return false;
+}
+
+const struct memory_provider_ops dmabuf_devmem_ops = {
+	.init			= mp_dmabuf_devmem_init,
+	.destroy		= mp_dmabuf_devmem_destroy,
+	.alloc_pages		= mp_dmabuf_devmem_alloc_pages,
+	.release_page		= mp_dmabuf_devmem_release_page,
+};
+EXPORT_SYMBOL(dmabuf_devmem_ops);

--
Pavel Begunkov



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