netdev - [RFC PATCH 09/21] include: add definitions for netgpu

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Date:   Thu, 18 Jun 2020 09:09:29 -0700
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     <netdev@...r.kernel.org>
CC:     <kernel-team@...com>, <axboe@...nel.dk>
Subject: [RFC PATCH 09/21] include: add definitions for netgpu

This adds the netgpu structure (which arguably should be private),
and some cruft to support using netgpu as a loadable module, which
should disappear.

Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
---
 include/net/netgpu.h | 65 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 include/net/netgpu.h

diff --git a/include/net/netgpu.h b/include/net/netgpu.h
new file mode 100644
index 000000000000..fee84ba3db78
--- /dev/null
+++ b/include/net/netgpu.h
@@ -0,0 +1,65 @@
+#pragma once
+
+struct net_device;
+#include <uapi/misc/shqueue.h>		/* XXX */
+
+struct netgpu_pgcache {
+	struct netgpu_pgcache *next;
+	struct page *page[];
+};
+
+struct netgpu_ctx {
+	struct xarray xa;		/* contains regions */
+	unsigned int index;
+	refcount_t ref;
+	struct shared_queue fill;
+	struct shared_queue rx;
+	struct net_device *dev;
+	struct netgpu_pgcache *napi_cache;
+	struct netgpu_pgcache *spare_cache;
+	struct netgpu_pgcache *any_cache;
+	spinlock_t pgcache_lock;
+	struct page *dummy_page;
+	unsigned page_extra_refc;
+	int queue_id;
+	int napi_cache_count;
+	int any_cache_count;
+	struct user_struct *user;
+	unsigned account_mem : 1;
+};
+
+int netgpu_get_page(struct netgpu_ctx *ctx, struct page **page,
+		    dma_addr_t *dma);
+void netgpu_put_page(struct netgpu_ctx *ctx, struct page *page, bool napi);
+int netgpu_get_pages(struct sock *sk, struct page **pages, unsigned long addr,
+		 int count);
+
+/*---------------------------------------------------------------------------*/
+/* XXX temporary development support */
+
+extern int (*fn_netgpu_get_page)(struct netgpu_ctx *ctx,
+			  struct page **page, dma_addr_t *dma);
+extern void (*fn_netgpu_put_page)(struct netgpu_ctx *, struct page *, bool);
+extern int (*fn_netgpu_get_pages)(struct sock *, struct page **,
+                           unsigned long, int);
+extern struct netgpu_ctx *g_ctx;
+
+static inline int
+__netgpu_get_page(struct netgpu_ctx *ctx,
+                  struct page **page, dma_addr_t *dma)
+{
+        return fn_netgpu_get_page(ctx, page, dma);
+}
+
+static inline void
+__netgpu_put_page(struct netgpu_ctx *ctx, struct page *page, bool napi)
+{
+        return fn_netgpu_put_page(ctx, page, napi);
+}
+
+static inline int
+__netgpu_get_pages(struct sock *sk, struct page **pages,
+                   unsigned long addr, int count)
+{
+        return fn_netgpu_get_pages(sk, pages, addr, count);
+}
-- 
2.24.1