summaryrefslogtreecommitdiff
path: root/drivers/net/bcm570x_queue.h
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/bcm570x_queue.h')
-rw-r--r--drivers/net/bcm570x_queue.h387
1 files changed, 387 insertions, 0 deletions
diff --git a/drivers/net/bcm570x_queue.h b/drivers/net/bcm570x_queue.h
new file mode 100644
index 0000000..336b3ca
--- /dev/null
+++ b/drivers/net/bcm570x_queue.h
@@ -0,0 +1,387 @@
+
+/******************************************************************************/
+/* */
+/* Broadcom BCM5700 Linux Network Driver, Copyright (c) 2000 Broadcom */
+/* Corporation. */
+/* All rights reserved. */
+/* */
+/* This program is free software; you can redistribute it and/or modify */
+/* it under the terms of the GNU General Public License as published by */
+/* the Free Software Foundation, located in the file LICENSE. */
+/* */
+/* Queue functions. */
+/* void QQ_InitQueue(PQQ_CONTAINER pQueue) */
+/* char QQ_Full(PQQ_CONTAINER pQueue) */
+/* char QQ_Empty(PQQ_CONTAINER pQueue) */
+/* unsigned int QQ_GetSize(PQQ_CONTAINER pQueue) */
+/* unsigned int QQ_GetEntryCnt(PQQ_CONTAINER pQueue) */
+/* char QQ_PushHead(PQQ_CONTAINER pQueue, PQQ_ENTRY pEntry) */
+/* char QQ_PushTail(PQQ_CONTAINER pQueue, PQQ_ENTRY pEntry) */
+/* PQQ_ENTRY QQ_PopHead(PQQ_CONTAINER pQueue) */
+/* PQQ_ENTRY QQ_PopTail(PQQ_CONTAINER pQueue) */
+/* PQQ_ENTRY QQ_GetHead(PQQ_CONTAINER pQueue, unsigned int Idx) */
+/* PQQ_ENTRY QQ_GetTail(PQQ_CONTAINER pQueue, unsigned int Idx) */
+/* */
+/* */
+/* History: */
+/* 02/25/00 Hav Khauv Initial version. */
+/******************************************************************************/
+
+#ifndef BCM_QUEUE_H
+#define BCM_QUEUE_H
+#ifndef EMBEDDED
+#define EMBEDDED 1
+#endif
+
+/******************************************************************************/
+/* Queue definitions. */
+/******************************************************************************/
+
+/* Entry for queueing. */
+typedef void *PQQ_ENTRY;
+
+/* Linux Atomic Ops support */
+typedef struct { int counter; } atomic_t;
+
+
+/*
+ * This combination of `inline' and `extern' has almost the effect of a
+ * macro. The way to use it is to put a function definition in a header
+ * file with these keywords, and put another copy of the definition
+ * (lacking `inline' and `extern') in a library file. The definition in
+ * the header file will cause most calls to the function to be inlined.
+ * If any uses of the function remain, they will refer to the single copy
+ * in the library.
+ */
+extern __inline void
+atomic_set(atomic_t* entry, int val)
+{
+ entry->counter = val;
+}
+extern __inline int
+atomic_read(atomic_t* entry)
+{
+ return entry->counter;
+}
+extern __inline void
+atomic_inc(atomic_t* entry)
+{
+ if(entry)
+ entry->counter++;
+}
+
+extern __inline void
+atomic_dec(atomic_t* entry)
+{
+ if(entry)
+ entry->counter--;
+}
+
+extern __inline void
+atomic_sub(int a, atomic_t* entry)
+{
+ if(entry)
+ entry->counter -= a;
+}
+extern __inline void
+atomic_add(int a, atomic_t* entry)
+{
+ if(entry)
+ entry->counter += a;
+}
+
+
+/* Queue header -- base type. */
+typedef struct {
+ unsigned int Head;
+ unsigned int Tail;
+ unsigned int Size;
+ atomic_t EntryCnt;
+ PQQ_ENTRY Array[1];
+} QQ_CONTAINER, *PQQ_CONTAINER;
+
+
+/* Declare queue type macro. */
+#define DECLARE_QUEUE_TYPE(_QUEUE_TYPE, _QUEUE_SIZE) \
+ \
+ typedef struct { \
+ QQ_CONTAINER Container; \
+ PQQ_ENTRY EntryBuffer[_QUEUE_SIZE]; \
+ } _QUEUE_TYPE, *P##_QUEUE_TYPE
+
+
+/******************************************************************************/
+/* Compilation switches. */
+/******************************************************************************/
+
+#if DBG
+#undef QQ_NO_OVERFLOW_CHECK
+#undef QQ_NO_UNDERFLOW_CHECK
+#endif /* DBG */
+
+#ifdef QQ_USE_MACROS
+/* notdone */
+#else
+
+#ifdef QQ_NO_INLINE
+#define __inline
+#endif /* QQ_NO_INLINE */
+
+/******************************************************************************/
+/* Description: */
+/* */
+/* Return: */
+/******************************************************************************/
+extern __inline void
+QQ_InitQueue(
+PQQ_CONTAINER pQueue,
+unsigned int QueueSize) {
+ pQueue->Head = 0;
+ pQueue->Tail = 0;
+ pQueue->Size = QueueSize+1;
+ atomic_set(&pQueue->EntryCnt, 0);
+} /* QQ_InitQueue */
+
+
+/******************************************************************************/
+/* Description: */
+/* */
+/* Return: */
+/******************************************************************************/
+extern __inline char
+QQ_Full(
+PQQ_CONTAINER pQueue) {
+ unsigned int NewHead;
+
+ NewHead = (pQueue->Head + 1) % pQueue->Size;
+
+ return(NewHead == pQueue->Tail);
+} /* QQ_Full */
+
+
+/******************************************************************************/
+/* Description: */
+/* */
+/* Return: */
+/******************************************************************************/
+extern __inline char
+QQ_Empty(
+PQQ_CONTAINER pQueue) {
+ return(pQueue->Head == pQueue->Tail);
+} /* QQ_Empty */
+
+
+/******************************************************************************/
+/* Description: */
+/* */
+/* Return: */
+/******************************************************************************/
+extern __inline unsigned int
+QQ_GetSize(
+PQQ_CONTAINER pQueue) {
+ return pQueue->Size;
+} /* QQ_GetSize */
+
+
+/******************************************************************************/
+/* Description: */
+/* */
+/* Return: */
+/******************************************************************************/
+extern __inline unsigned int
+QQ_GetEntryCnt(
+PQQ_CONTAINER pQueue) {
+ return atomic_read(&pQueue->EntryCnt);
+} /* QQ_GetEntryCnt */
+
+
+/******************************************************************************/
+/* Description: */
+/* */
+/* Return: */
+/* TRUE entry was added successfully. */
+/* FALSE queue is full. */
+/******************************************************************************/
+extern __inline char
+QQ_PushHead(
+PQQ_CONTAINER pQueue,
+PQQ_ENTRY pEntry) {
+ unsigned int Head;
+
+ Head = (pQueue->Head + 1) % pQueue->Size;
+
+#if !defined(QQ_NO_OVERFLOW_CHECK)
+ if(Head == pQueue->Tail) {
+ return 0;
+ } /* if */
+#endif /* QQ_NO_OVERFLOW_CHECK */
+
+ pQueue->Array[pQueue->Head] = pEntry;
+ wmb();
+ pQueue->Head = Head;
+ atomic_inc(&pQueue->EntryCnt);
+
+ return -1;
+} /* QQ_PushHead */
+
+
+/******************************************************************************/
+/* Description: */
+/* */
+/* Return: */
+/* TRUE entry was added successfully. */
+/* FALSE queue is full. */
+/******************************************************************************/
+extern __inline char
+QQ_PushTail(
+PQQ_CONTAINER pQueue,
+PQQ_ENTRY pEntry) {
+ unsigned int Tail;
+
+ Tail = pQueue->Tail;
+ if(Tail == 0) {
+ Tail = pQueue->Size;
+ } /* if */
+ Tail--;
+
+#if !defined(QQ_NO_OVERFLOW_CHECK)
+ if(Tail == pQueue->Head) {
+ return 0;
+ } /* if */
+#endif /* QQ_NO_OVERFLOW_CHECK */
+
+ pQueue->Array[Tail] = pEntry;
+ wmb();
+ pQueue->Tail = Tail;
+ atomic_inc(&pQueue->EntryCnt);
+
+ return -1;
+} /* QQ_PushTail */
+
+
+/******************************************************************************/
+/* Description: */
+/* */
+/* Return: */
+/******************************************************************************/
+extern __inline PQQ_ENTRY
+QQ_PopHead(
+PQQ_CONTAINER pQueue) {
+ unsigned int Head;
+ PQQ_ENTRY Entry;
+
+ Head = pQueue->Head;
+
+#if !defined(QQ_NO_UNDERFLOW_CHECK)
+ if(Head == pQueue->Tail) {
+ return (PQQ_ENTRY) 0;
+ } /* if */
+#endif /* QQ_NO_UNDERFLOW_CHECK */
+
+ if(Head == 0) {
+ Head = pQueue->Size;
+ } /* if */
+ Head--;
+
+ Entry = pQueue->Array[Head];
+#ifdef EMBEDDED
+ membar();
+#else
+ mb();
+#endif
+ pQueue->Head = Head;
+ atomic_dec(&pQueue->EntryCnt);
+
+ return Entry;
+} /* QQ_PopHead */
+
+
+/******************************************************************************/
+/* Description: */
+/* */
+/* Return: */
+/******************************************************************************/
+extern __inline PQQ_ENTRY
+QQ_PopTail(
+PQQ_CONTAINER pQueue) {
+ unsigned int Tail;
+ PQQ_ENTRY Entry;
+
+ Tail = pQueue->Tail;
+
+#if !defined(QQ_NO_UNDERFLOW_CHECK)
+ if(Tail == pQueue->Head) {
+ return (PQQ_ENTRY) 0;
+ } /* if */
+#endif /* QQ_NO_UNDERFLOW_CHECK */
+
+ Entry = pQueue->Array[Tail];
+#ifdef EMBEDDED
+ membar();
+#else
+ mb();
+#endif
+ pQueue->Tail = (Tail + 1) % pQueue->Size;
+ atomic_dec(&pQueue->EntryCnt);
+
+ return Entry;
+} /* QQ_PopTail */
+
+
+/******************************************************************************/
+/* Description: */
+/* */
+/* Return: */
+/******************************************************************************/
+extern __inline PQQ_ENTRY
+QQ_GetHead(
+ PQQ_CONTAINER pQueue,
+ unsigned int Idx)
+{
+ if(Idx >= atomic_read(&pQueue->EntryCnt))
+ {
+ return (PQQ_ENTRY) 0;
+ }
+
+ if(pQueue->Head > Idx)
+ {
+ Idx = pQueue->Head - Idx;
+ }
+ else
+ {
+ Idx = pQueue->Size - (Idx - pQueue->Head);
+ }
+ Idx--;
+
+ return pQueue->Array[Idx];
+}
+
+
+/******************************************************************************/
+/* Description: */
+/* */
+/* Return: */
+/******************************************************************************/
+extern __inline PQQ_ENTRY
+QQ_GetTail(
+ PQQ_CONTAINER pQueue,
+ unsigned int Idx)
+{
+ if(Idx >= atomic_read(&pQueue->EntryCnt))
+ {
+ return (PQQ_ENTRY) 0;
+ }
+
+ Idx += pQueue->Tail;
+ if(Idx >= pQueue->Size)
+ {
+ Idx = Idx - pQueue->Size;
+ }
+
+ return pQueue->Array[Idx];
+}
+
+#endif /* QQ_USE_MACROS */
+
+
+#endif /* QUEUE_H */
generated by cgit v1.1 at 2024-11-16 03:50:27 +0000