1 files changed, 407 insertions, 0 deletions
diff --git a/sys/dev/ice/ice_bitops.h b/sys/dev/ice/ice_bitops.h
new file mode 100644
index 000000000000..c7b5ae5a6a56
--- /dev/null
+++ b/sys/dev/ice/ice_bitops.h
@@ -0,0 +1,407 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*  Copyright (c) 2020, Intel Corporation
+ *  All rights reserved.
+ *
+ *  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.
+ *
+ *   3. Neither the name of the Intel Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived from
+ *      this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 _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
+ *
+ * Set all of the bits in a bitmap to zero. Note that this function assumes it
+ * operates on an ice_bitmap_t which was declared using ice_declare_bitmap. It
+ * will zero every bit in the last chunk, even if those bits are beyond the
+ * size.
+ */
+static inline void ice_zero_bitmap(ice_bitmap_t *bmp, u16 size)
+{
+	ice_memset(bmp, 0, BITS_TO_CHUNKS(size) * sizeof(ice_bitmap_t),
+		   ICE_NONDMA_MEM);
+}
+
+/**
+ * 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] = (dst[i] & ~mask) | ((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] = (dst[i] & ~mask) | ((bmp1[i] | bmp2[i]) & mask);
+}
+
+/**
+ * ice_xor_bitmap - bitwise XOR 2 bitmaps and store result in dst bitmap
+ * @dst: Destination bitmap that receive the result of the operation
+ * @bmp1: The first bitmap of XOR operation
+ * @bmp2: The second bitmap to XOR with the first
+ * @size: Size of the bitmaps in bits
+ *
+ * This function performs a bitwise XOR 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_xor_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 XOR 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] = (dst[i] & ~mask) | ((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. Note that this function assumes
+ * it is operating on a bitmap declared using ice_declare_bitmap. It will copy
+ * the entire last chunk even if this contains bits beyond the size.
+ */
+static inline void ice_cp_bitmap(ice_bitmap_t *dst, ice_bitmap_t *src, u16 size)
+{
+	ice_memcpy(dst, src, BITS_TO_CHUNKS(size) * sizeof(ice_bitmap_t),
+		   ICE_NONDMA_TO_NONDMA);
+}
+
+/**
+ * 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;
+}
+
+#undef BIT_CHUNK
+#undef BIT_IN_CHUNK
+#undef LAST_CHUNK_BITS
+#undef LAST_CHUNK_MASK
+
+#endif /* _ICE_BITOPS_H_ */