[PATCH v4 38/38] net/ice/base: rework on bit ops

[Qi Zhang <qi.z.zhang@intel.com>]

Move all bit ops related functions from ice_osdep.h into ice_bitops.h.
Also remove the limitation that bitmap can only be 64 bits in
ice_set_bit and ice_clear_bit.

Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr@intel.com>
Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Reviewed-by: Qiming Yang <qiming.yang@intel.com>
Reviewed-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
---
 drivers/net/ice/base/ice_bitops.h | 361 ++++++++++++++++++++++++++++++++++++++
 drivers/net/ice/base/ice_osdep.h  | 168 ------------------
 drivers/net/ice/base/ice_type.h   |   1 +
 3 files changed, 362 insertions(+), 168 deletions(-)
 create mode 100644 drivers/net/ice/base/ice_bitops.h

diff --git a/drivers/net/ice/base/ice_bitops.h b/drivers/net/ice/base/ice_bitops.h
new file mode 100644
index 000000000..f52713021
--- /dev/null
+++ b/drivers/net/ice/base/ice_bitops.h
@@ -0,0 +1,361 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2001-2019
+ */
+
+#ifndef _ICE_BITOPS_H_
+#define _ICE_BITOPS_H_
+
+/* Define the size of the bitmap chunk */
+typedef u32 ice_bitmap_t;
+
+
+/* Number of bits per bitmap chunk */
+#define BITS_PER_CHUNK		(BITS_PER_BYTE * sizeof(ice_bitmap_t))
+/* Determine which chunk a bit belongs in */
+#define BIT_CHUNK(nr)		((nr) / BITS_PER_CHUNK)
+/* How many chunks are required to store this many bits */
+#define BITS_TO_CHUNKS(sz)	DIVIDE_AND_ROUND_UP((sz), BITS_PER_CHUNK)
+/* Which bit inside a chunk this bit corresponds to */
+#define BIT_IN_CHUNK(nr)	((nr) % BITS_PER_CHUNK)
+/* How many bits are valid in the last chunk, assumes nr > 0 */
+#define LAST_CHUNK_BITS(nr)	((((nr) - 1) % BITS_PER_CHUNK) + 1)
+/* Generate a bitmask of valid bits in the last chunk, assumes nr > 0 */
+#define LAST_CHUNK_MASK(nr)	(((ice_bitmap_t)~0) >> \
+				 (BITS_PER_CHUNK - LAST_CHUNK_BITS(nr)))
+
+#define ice_declare_bitmap(A, sz) \
+	ice_bitmap_t A[BITS_TO_CHUNKS(sz)]
+
+static inline bool ice_is_bit_set_internal(u16 nr, const ice_bitmap_t *bitmap)
+{
+	return !!(*bitmap & BIT(nr));
+}
+
+/*
+ * If atomic version of the bitops are required, each specific OS
+ * implementation will need to implement OS/platform specific atomic
+ * version of the functions below:
+ *
+ * ice_clear_bit_internal
+ * ice_set_bit_internal
+ * ice_test_and_clear_bit_internal
+ * ice_test_and_set_bit_internal
+ *
+ * and define macro ICE_ATOMIC_BITOPS to overwrite the default non-atomic
+ * implementation.
+ */
+static inline void ice_clear_bit_internal(u16 nr, ice_bitmap_t *bitmap)
+{
+	*bitmap &= ~BIT(nr);
+}
+
+static inline void ice_set_bit_internal(u16 nr, ice_bitmap_t *bitmap)
+{
+	*bitmap |= BIT(nr);
+}
+
+static inline bool ice_test_and_clear_bit_internal(u16 nr,
+						   ice_bitmap_t *bitmap)
+{
+	if (ice_is_bit_set_internal(nr, bitmap)) {
+		ice_clear_bit_internal(nr, bitmap);
+		return true;
+	}
+	return false;
+}
+
+static inline bool ice_test_and_set_bit_internal(u16 nr, ice_bitmap_t *bitmap)
+{
+	if (ice_is_bit_set_internal(nr, bitmap))
+		return true;
+
+	ice_set_bit_internal(nr, bitmap);
+	return false;
+}
+
+/**
+ * ice_is_bit_set - Check state of a bit in a bitmap
+ * @bitmap: the bitmap to check
+ * @nr: the bit to check
+ *
+ * Returns true if bit nr of bitmap is set. False otherwise. Assumes that nr
+ * is less than the size of the bitmap.
+ */
+static inline bool ice_is_bit_set(const ice_bitmap_t *bitmap, u16 nr)
+{
+	return ice_is_bit_set_internal(BIT_IN_CHUNK(nr),
+				       &bitmap[BIT_CHUNK(nr)]);
+}
+
+/**
+ * ice_clear_bit - Clear a bit in a bitmap
+ * @bitmap: the bitmap to change
+ * @nr: the bit to change
+ *
+ * Clears the bit nr in bitmap. Assumes that nr is less than the size of the
+ * bitmap.
+ */
+static inline void ice_clear_bit(u16 nr, ice_bitmap_t *bitmap)
+{
+	ice_clear_bit_internal(BIT_IN_CHUNK(nr), &bitmap[BIT_CHUNK(nr)]);
+}
+
+/**
+ * ice_set_bit - Set a bit in a bitmap
+ * @bitmap: the bitmap to change
+ * @nr: the bit to change
+ *
+ * Sets the bit nr in bitmap. Assumes that nr is less than the size of the
+ * bitmap.
+ */
+static inline void ice_set_bit(u16 nr, ice_bitmap_t *bitmap)
+{
+	ice_set_bit_internal(BIT_IN_CHUNK(nr), &bitmap[BIT_CHUNK(nr)]);
+}
+
+/**
+ * ice_test_and_clear_bit - Atomically clear a bit and return the old bit value
+ * @nr: the bit to change
+ * @bitmap: the bitmap to change
+ *
+ * Check and clear the bit nr in bitmap. Assumes that nr is less than the size
+ * of the bitmap.
+ */
+static inline bool
+ice_test_and_clear_bit(u16 nr, ice_bitmap_t *bitmap)
+{
+	return ice_test_and_clear_bit_internal(BIT_IN_CHUNK(nr),
+					       &bitmap[BIT_CHUNK(nr)]);
+}
+
+/**
+ * ice_test_and_set_bit - Atomically set a bit and return the old bit value
+ * @nr: the bit to change
+ * @bitmap: the bitmap to change
+ *
+ * Check and set the bit nr in bitmap. Assumes that nr is less than the size of
+ * the bitmap.
+ */
+static inline bool
+ice_test_and_set_bit(u16 nr, ice_bitmap_t *bitmap)
+{
+	return ice_test_and_set_bit_internal(BIT_IN_CHUNK(nr),
+					     &bitmap[BIT_CHUNK(nr)]);
+}
+
+/* ice_zero_bitmap - set bits of bitmap to zero.
+ * @bmp: bitmap to set zeros
+ * @size: Size of the bitmaps in bits
+ *
+ * This function sets bits of a bitmap to zero.
+ */
+static inline void ice_zero_bitmap(ice_bitmap_t *bmp, u16 size)
+{
+	ice_bitmap_t mask;
+	u16 i;
+
+	/* Handle all but last chunk*/
+	for (i = 0; i < BITS_TO_CHUNKS(size) - 1; i++)
+		bmp[i] = 0;
+	/* For the last chunk, we want to take care of not to modify bits
+	 * outside the size boundary. ~mask take care of all the bits outside
+	 * the boundary.
+	 */
+	mask = LAST_CHUNK_MASK(size);
+	bmp[i] &= ~mask;
+}
+
+/**
+ * ice_and_bitmap - bitwise AND 2 bitmaps and store result in dst bitmap
+ * @dst: Destination bitmap that receive the result of the operation
+ * @bmp1: The first bitmap to intersect
+ * @bmp2: The second bitmap to intersect wit the first
+ * @size: Size of the bitmaps in bits
+ *
+ * This function performs a bitwise AND on two "source" bitmaps of the same size
+ * and stores the result to "dst" bitmap. The "dst" bitmap must be of the same
+ * size as the "source" bitmaps to avoid buffer overflows. This function returns
+ * a non-zero value if at least one bit location from both "source" bitmaps is
+ * non-zero.
+ */
+static inline int
+ice_and_bitmap(ice_bitmap_t *dst, const ice_bitmap_t *bmp1,
+	       const ice_bitmap_t *bmp2, u16 size)
+{
+	ice_bitmap_t res = 0, mask;
+	u16 i;
+
+	/* Handle all but the last chunk */
+	for (i = 0; i < BITS_TO_CHUNKS(size) - 1; i++) {
+		dst[i] = bmp1[i] & bmp2[i];
+		res |= dst[i];
+	}
+
+	/* We want to take care not to modify any bits outside of the bitmap
+	 * size, even in the destination bitmap. Thus, we won't directly
+	 * assign the last bitmap, but instead use a bitmask to ensure we only
+	 * modify bits which are within the size, and leave any bits above the
+	 * size value alone.
+	 */
+	mask = LAST_CHUNK_MASK(size);
+	dst[i] &= ~mask;
+	dst[i] |= (bmp1[i] & bmp2[i]) & mask;
+	res |= dst[i] & mask;
+
+	return res != 0;
+}
+
+/**
+ * ice_or_bitmap - bitwise OR 2 bitmaps and store result in dst bitmap
+ * @dst: Destination bitmap that receive the result of the operation
+ * @bmp1: The first bitmap to intersect
+ * @bmp2: The second bitmap to intersect wit the first
+ * @size: Size of the bitmaps in bits
+ *
+ * This function performs a bitwise OR on two "source" bitmaps of the same size
+ * and stores the result to "dst" bitmap. The "dst" bitmap must be of the same
+ * size as the "source" bitmaps to avoid buffer overflows.
+ */
+static inline void
+ice_or_bitmap(ice_bitmap_t *dst, const ice_bitmap_t *bmp1,
+	      const ice_bitmap_t *bmp2, u16 size)
+{
+	ice_bitmap_t mask;
+	u16 i;
+
+	/* Handle all but last chunk*/
+	for (i = 0; i < BITS_TO_CHUNKS(size) - 1; i++)
+		dst[i] = bmp1[i] | bmp2[i];
+
+	/* We want to only OR bits within the size. Furthermore, we also do
+	 * not want to modify destination bits which are beyond the specified
+	 * size. Use a bitmask to ensure that we only modify the bits that are
+	 * within the specified size.
+	 */
+	mask = LAST_CHUNK_MASK(size);
+	dst[i] &= ~mask;
+	dst[i] |= (bmp1[i] | bmp2[i]) & mask;
+}
+
+/**
+ * ice_find_next_bit - Find the index of the next set bit of a bitmap
+ * @bitmap: the bitmap to scan
+ * @size: the size in bits of the bitmap
+ * @offset: the offset to start at
+ *
+ * Scans the bitmap and returns the index of the first set bit which is equal
+ * to or after the specified offset. Will return size if no bits are set.
+ */
+static inline u16
+ice_find_next_bit(const ice_bitmap_t *bitmap, u16 size, u16 offset)
+{
+	u16 i, j;
+
+	if (offset >= size)
+		return size;
+
+	/* Since the starting position may not be directly on a chunk
+	 * boundary, we need to be careful to handle the first chunk specially
+	 */
+	i = BIT_CHUNK(offset);
+	if (bitmap[i] != 0) {
+		u16 off = i * BITS_PER_CHUNK;
+
+		for (j = offset % BITS_PER_CHUNK; j < BITS_PER_CHUNK; j++) {
+			if (ice_is_bit_set(bitmap, off + j))
+				return min(size, (u16)(off + j));
+		}
+	}
+
+	/* Now we handle the remaining chunks, if any */
+	for (i++; i < BITS_TO_CHUNKS(size); i++) {
+		if (bitmap[i] != 0) {
+			u16 off = i * BITS_PER_CHUNK;
+
+			for (j = 0; j < BITS_PER_CHUNK; j++) {
+				if (ice_is_bit_set(bitmap, off + j))
+					return min(size, (u16)(off + j));
+			}
+		}
+	}
+	return size;
+}
+
+/**
+ * ice_find_first_bit - Find the index of the first set bit of a bitmap
+ * @bitmap: the bitmap to scan
+ * @size: the size in bits of the bitmap
+ *
+ * Scans the bitmap and returns the index of the first set bit. Will return
+ * size if no bits are set.
+ */
+static inline u16 ice_find_first_bit(const ice_bitmap_t *bitmap, u16 size)
+{
+	return ice_find_next_bit(bitmap, size, 0);
+}
+
+/**
+ * ice_is_any_bit_set - Return true of any bit in the bitmap is set
+ * @bitmap: the bitmap to check
+ * @size: the size of the bitmap
+ *
+ * Equivalent to checking if ice_find_first_bit returns a value less than the
+ * bitmap size.
+ */
+static inline bool ice_is_any_bit_set(ice_bitmap_t *bitmap, u16 size)
+{
+	return ice_find_first_bit(bitmap, size) < size;
+}
+
+/**
+ * ice_cp_bitmap - copy bitmaps.
+ * @dst: bitmap destination
+ * @src: bitmap to copy from
+ * @size: Size of the bitmaps in bits
+ *
+ * This function copy bitmap from src to dst.
+ */
+static inline void ice_cp_bitmap(ice_bitmap_t *dst, ice_bitmap_t *src, u16 size)
+{
+	ice_bitmap_t mask;
+	u16 i;
+
+	/* Handle all but last chunk*/
+	for (i = 0; i < BITS_TO_CHUNKS(size) - 1; i++)
+		dst[i] = src[i];
+
+	/* We want to only copy bits within the size.*/
+	mask = LAST_CHUNK_MASK(size);
+	dst[i] &= ~mask;
+	dst[i] |= src[i] & mask;
+}
+
+/**
+ * ice_cmp_bitmaps - compares two bitmaps.
+ * @bmp1: the bitmap to compare
+ * @bmp2: the bitmap to compare with bmp1
+ * @size: Size of the bitmaps in bits
+ *
+ * This function compares two bitmaps, and returns result as true or false.
+ */
+static inline bool
+ice_cmp_bitmap(ice_bitmap_t *bmp1, ice_bitmap_t *bmp2, u16 size)
+{
+	ice_bitmap_t mask;
+	u16 i;
+
+	/* Handle all but last chunk*/
+	for (i = 0; i < BITS_TO_CHUNKS(size) - 1; i++)
+		if (bmp1[i] != bmp2[i])
+			return false;
+
+	/* We want to only compare bits within the size.*/
+	mask = LAST_CHUNK_MASK(size);
+	if ((bmp1[i] & mask) != (bmp2[i] & mask))
+		return false;
+
+	return true;
+}
+
+
+#endif /* _ICE_BITOPS_H_ */
diff --git a/drivers/net/ice/base/ice_osdep.h b/drivers/net/ice/base/ice_osdep.h
index 560e36c1b..d2d9238c7 100644
--- a/drivers/net/ice/base/ice_osdep.h
+++ b/drivers/net/ice/base/ice_osdep.h
@@ -147,95 +147,6 @@ static inline uint32_t ice_read_addr(volatile void *addr)
 #define div64_long(n, d) ((n) / (d))
 
 #define BITS_PER_BYTE       8
-typedef u32 ice_bitmap_t;
-#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
-#define BITS_TO_CHUNKS(nr)   DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(ice_bitmap_t))
-#define ice_declare_bitmap(name, bits) \
-	ice_bitmap_t name[BITS_TO_CHUNKS(bits)]
-
-#define BITS_CHUNK_MASK(nr)	(((ice_bitmap_t)~0) >>			\
-		((BITS_PER_BYTE * sizeof(ice_bitmap_t)) -		\
-		(((nr) - 1) % (BITS_PER_BYTE * sizeof(ice_bitmap_t))	\
-		 + 1)))
-#define BITS_PER_CHUNK          (BITS_PER_BYTE * sizeof(ice_bitmap_t))
-#define BIT_CHUNK(nr)           ((nr) / BITS_PER_CHUNK)
-#define BIT_IN_CHUNK(nr)        BIT((nr) % BITS_PER_CHUNK)
-
-static inline bool ice_is_bit_set(const ice_bitmap_t *bitmap, u16 nr)
-{
-	return !!(bitmap[BIT_CHUNK(nr)] & BIT_IN_CHUNK(nr));
-}
-
-#define ice_and_bitmap(d, b1, b2, sz) \
-	ice_intersect_bitmaps((u8 *)d, (u8 *)b1, (const u8 *)b2, (u16)sz)
-static inline int
-ice_intersect_bitmaps(u8 *dst, const u8 *bmp1, const u8 *bmp2, u16 sz)
-{
-	u32 res = 0;
-	int cnt;
-	u16 i;
-
-	/* Utilize 32-bit operations */
-	cnt = (sz % BITS_PER_BYTE) ?
-		(sz / BITS_PER_BYTE) + 1 : sz / BITS_PER_BYTE;
-	for (i = 0; i < cnt / 4; i++) {
-		((u32 *)dst)[i] = ((const u32 *)bmp1)[i] &
-		((const u32 *)bmp2)[i];
-		res |= ((u32 *)dst)[i];
-	}
-
-	for (i *= 4; i < cnt; i++) {
-		if ((sz % 8 == 0) || (i + 1 < cnt)) {
-			dst[i] = bmp1[i] & bmp2[i];
-		} else {
-			/* Remaining bits that do not occupy the whole byte */
-			u8 mask = ~0u >> (8 - (sz % 8));
-
-			dst[i] = bmp1[i] & bmp2[i] & mask;
-		}
-
-		res |= dst[i];
-	}
-
-	return res != 0;
-}
-
-static inline int ice_find_first_bit(ice_bitmap_t *name, u16 size)
-{
-	u16 i;
-
-	for (i = 0; i < BITS_PER_BYTE * (size / BITS_PER_BYTE); i++)
-		if (ice_is_bit_set(name, i))
-			return i;
-	return size;
-}
-
-static inline int ice_find_next_bit(ice_bitmap_t *name, u16 size, u16 bits)
-{
-	u16 i;
-
-	for (i = bits; i < BITS_PER_BYTE * (size / BITS_PER_BYTE); i++)
-		if (ice_is_bit_set(name, i))
-			return i;
-	return bits;
-}
-
-#define for_each_set_bit(bit, addr, size)				\
-	for ((bit) = ice_find_first_bit((addr), (size));		\
-	(bit) < (size);							\
-	(bit) = ice_find_next_bit((addr), (size), (bit) + 1))
-
-static inline bool ice_is_any_bit_set(ice_bitmap_t *bitmap, u32 bits)
-{
-	u32 max_index = BITS_TO_CHUNKS(bits);
-	u32 i;
-
-	for (i = 0; i < max_index; i++) {
-		if (bitmap[i])
-			return true;
-	}
-	return false;
-}
 
 /* memory allocation tracking */
 struct ice_dma_mem {
@@ -273,85 +184,6 @@ struct ice_virt_mem {
 #define HTONS(a) rte_cpu_to_be_16(a)
 #define HTONL(a) rte_cpu_to_be_32(a)
 
-static inline void
-ice_set_bit(unsigned int nr, volatile ice_bitmap_t *addr)
-{
-	__sync_fetch_and_or(addr, (1UL << nr));
-}
-
-static inline void
-ice_clear_bit(unsigned int nr, volatile ice_bitmap_t *addr)
-{
-	__sync_fetch_and_and(addr, (0UL << nr));
-}
-
-static inline void
-ice_zero_bitmap(ice_bitmap_t *bmp, u16 size)
-{
-	unsigned long mask;
-	u16 i;
-
-	for (i = 0; i < BITS_TO_CHUNKS(size) - 1; i++)
-		bmp[i] = 0;
-	mask = BITS_CHUNK_MASK(size);
-	bmp[i] &= ~mask;
-}
-
-static inline void
-ice_or_bitmap(ice_bitmap_t *dst, const ice_bitmap_t *bmp1,
-	      const ice_bitmap_t *bmp2, u16 size)
-{
-	unsigned long mask;
-	u16 i;
-
-	/* Handle all but last chunk*/
-	for (i = 0; i < BITS_TO_CHUNKS(size) - 1; i++)
-		dst[i] = bmp1[i] | bmp2[i];
-
-	/* We want to only OR bits within the size. Furthermore, we also do
-	 * not want to modify destination bits which are beyond the specified
-	 * size. Use a bitmask to ensure that we only modify the bits that are
-	 * within the specified size.
-	 */
-	mask = BITS_CHUNK_MASK(size);
-	dst[i] &= ~mask;
-	dst[i] |= (bmp1[i] | bmp2[i]) & mask;
-}
-
-static inline void ice_cp_bitmap(ice_bitmap_t *dst, ice_bitmap_t *src, u16 size)
-{
-	ice_bitmap_t mask;
-	u16 i;
-
-	/* Handle all but last chunk*/
-	for (i = 0; i < BITS_TO_CHUNKS(size) - 1; i++)
-		dst[i] = src[i];
-
-	/* We want to only copy bits within the size.*/
-	mask = BITS_CHUNK_MASK(size);
-	dst[i] &= ~mask;
-	dst[i] |= src[i] & mask;
-}
-
-static inline bool
-ice_cmp_bitmap(ice_bitmap_t *bmp1, ice_bitmap_t *bmp2, u16 size)
-{
-	ice_bitmap_t mask;
-	u16 i;
-
-	/* Handle all but last chunk*/
-	for (i = 0; i < BITS_TO_CHUNKS(size) - 1; i++)
-		if (bmp1[i] != bmp2[i])
-			return false;
-
-	/* We want to only compare bits within the size.*/
-	mask = BITS_CHUNK_MASK(size);
-	if ((bmp1[i] & mask) != (bmp2[i] & mask))
-		return false;
-
-	return true;
-}
-
 /* SW spinlock */
 struct ice_lock {
 	rte_spinlock_t spinlock;
diff --git a/drivers/net/ice/base/ice_type.h b/drivers/net/ice/base/ice_type.h
index ef0b5bb52..b0bdec2df 100644
--- a/drivers/net/ice/base/ice_type.h
+++ b/drivers/net/ice/base/ice_type.h
@@ -26,6 +26,7 @@
 #include "ice_hw_autogen.h"
 #include "ice_devids.h"
 #include "ice_osdep.h"
+#include "ice_bitops.h" /* Must come before ice_controlq.h */
 #include "ice_controlq.h"
 #include "ice_lan_tx_rx.h"
 #include "ice_flex_type.h"
-- 
2.13.6