git: 4317faf44d43 - stable/13 - LinuxKPI: add page pool skeleton

The branch stable/13 has been updated by bz:

URL: https://cgit.FreeBSD.org/src/commit/?id=4317faf44d434f514487c1c1c54b760971ed6f9c

commit 4317faf44d434f514487c1c1c54b760971ed6f9c
Author:     Bjoern A. Zeeb <bz@FreeBSD.org>
AuthorDate: 2023-05-23 23:15:57 +0000
Commit:     Bjoern A. Zeeb <bz@FreeBSD.org>
CommitDate: 2023-11-29 16:36:04 +0000

    LinuxKPI: add page pool skeleton
    
    Add the page pool skeleton based on a wireless driver.  We have to
    sort out some struct page problems first before we can start
    implementing this but that should happen independent of all other
    changes.
    
    (cherry picked from commit 517e0978db1ff92d9f2b86fe735aba24bca72038)
---
 sys/compat/linuxkpi/common/include/net/page_pool.h | 119 +++++++++++++++++++++
 1 file changed, 119 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/net/page_pool.h b/sys/compat/linuxkpi/common/include/net/page_pool.h
new file mode 100644
index 000000000000..4377ec1d53d4
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/net/page_pool.h
@@ -0,0 +1,119 @@
+/*-
+ * Copyright (c) 2023 Bjoern A. Zeeb
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_LINUXKPI_NET_PAGE_POOL_H
+#define	_LINUXKPI_NET_PAGE_POOL_H
+
+#include <linux/kernel.h>	/* pr_debug */
+#include <linux/types.h>
+#include <linux/dma-mapping.h>
+
+struct device;
+
+struct page_pool_params {
+	struct device			*dev;
+	uint32_t			flags;
+	uint32_t			order;
+	uint32_t			pool_size;
+	uint32_t			max_len;
+	uint32_t			offset;
+	int				nid;		/* NUMA */
+	enum dma_data_direction		dma_dir;
+};
+
+struct page_pool {
+};
+
+#define	PP_FLAG_DMA_MAP		BIT(0)
+#define	PP_FLAG_DMA_SYNC_DEV	BIT(1)
+#define	PP_FLAG_PAGE_FRAG	BIT(2)
+
+static inline struct page_pool *
+page_pool_create(const struct page_pool_params *ppparams)
+{
+
+	pr_debug("%s: TODO\n", __func__);
+	return (NULL);
+}
+
+static inline void
+page_pool_destroy(struct page_pool *ppool)
+{
+
+	pr_debug("%s: TODO\n", __func__);
+}
+
+static inline struct page *
+page_pool_dev_alloc_frag(struct page_pool *ppool, uint32_t *offset,
+    size_t size)
+{
+
+	pr_debug("%s: TODO\n", __func__);
+	return (NULL);
+}
+
+static inline dma_addr_t
+page_pool_get_dma_addr(struct page *page)
+{
+
+	pr_debug("%s: TODO\n", __func__);
+	return (0);
+}
+
+static inline enum dma_data_direction
+page_pool_get_dma_dir(const struct page_pool *ppool)
+{
+
+	pr_debug("%s: TODO\n", __func__);
+	return (DMA_BIDIRECTIONAL);
+}
+
+static inline void
+page_pool_put_full_page(struct page_pool *ppool, struct page *page,
+    bool allow_direct)
+{
+
+	pr_debug("%s: TODO\n", __func__);
+}
+
+static inline int
+page_pool_ethtool_stats_get_count(void)
+{
+
+	pr_debug("%s: TODO\n", __func__);
+	return (0);
+}
+
+static inline uint8_t *
+page_pool_ethtool_stats_get_strings(uint8_t *x)
+{
+
+	pr_debug("%s: TODO\n", __func__);
+	return (x);
+}
+
+#endif	/* _LINUXKPI_NET_PAGE_POOL_H */