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authorGregory CLEMENT <gregory.clement@free-electrons.com>2016-03-14 11:39:04 +0300
committerDavid S. Miller <davem@davemloft.net>2016-03-14 19:19:46 +0300
commit8cb2d8bf57e6e004c37db2fb4ce74f4d032b7cd0 (patch)
treed70238eede693b7bf8b42d86a4eab534754ce341 /include/net/hwbm.h
parentdc35a10f68d3781c2345d60b22103785985ca849 (diff)
downloadlinux-8cb2d8bf57e6e004c37db2fb4ce74f4d032b7cd0.tar.xz
net: add a hardware buffer management helper API
This basic implementation allows to share code between driver using hardware buffer management. As the code is hardware agnostic, there is few helpers, most of the optimization brought by the an HW BM has to be done at driver level. Tested-by: Sebastian Careba <nitroshift@yahoo.com> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/hwbm.h')
-rw-r--r--include/net/hwbm.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/include/net/hwbm.h b/include/net/hwbm.h
new file mode 100644
index 000000000000..47d08662501b
--- /dev/null
+++ b/include/net/hwbm.h
@@ -0,0 +1,28 @@
+#ifndef _HWBM_H
+#define _HWBM_H
+
+struct hwbm_pool {
+ /* Capacity of the pool */
+ int size;
+ /* Size of the buffers managed */
+ int frag_size;
+ /* Number of buffers currently used by this pool */
+ int buf_num;
+ /* constructor called during alocation */
+ int (*construct)(struct hwbm_pool *bm_pool, void *buf);
+ /* protect acces to the buffer counter*/
+ spinlock_t lock;
+ /* private data */
+ void *priv;
+};
+#ifdef CONFIG_HWBM
+void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf);
+int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp);
+int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp);
+#else
+void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf) {}
+int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp) { return 0; }
+int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num, gfp_t gfp)
+{ return 0; }
+#endif /* CONFIG_HWBM */
+#endif /* _HWBM_H */