Update Linux to v5.10.109
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz
Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/net/ethtool/bitset.c b/net/ethtool/bitset.c
new file mode 100644
index 0000000..0515d66
--- /dev/null
+++ b/net/ethtool/bitset.c
@@ -0,0 +1,833 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/ethtool_netlink.h>
+#include <linux/bitmap.h>
+#include "netlink.h"
+#include "bitset.h"
+
+/* Some bitmaps are internally represented as an array of unsigned long, some
+ * as an array of u32 (some even as single u32 for now). To avoid the need of
+ * wrappers on caller side, we provide two set of functions: those with "32"
+ * suffix in their names expect u32 based bitmaps, those without it expect
+ * unsigned long bitmaps.
+ */
+
+static u32 ethnl_lower_bits(unsigned int n)
+{
+ return ~(u32)0 >> (32 - n % 32);
+}
+
+static u32 ethnl_upper_bits(unsigned int n)
+{
+ return ~(u32)0 << (n % 32);
+}
+
+/**
+ * ethnl_bitmap32_clear() - Clear u32 based bitmap
+ * @dst: bitmap to clear
+ * @start: beginning of the interval
+ * @end: end of the interval
+ * @mod: set if bitmap was modified
+ *
+ * Clear @nbits bits of a bitmap with indices @start <= i < @end
+ */
+static void ethnl_bitmap32_clear(u32 *dst, unsigned int start, unsigned int end,
+ bool *mod)
+{
+ unsigned int start_word = start / 32;
+ unsigned int end_word = end / 32;
+ unsigned int i;
+ u32 mask;
+
+ if (end <= start)
+ return;
+
+ if (start % 32) {
+ mask = ethnl_upper_bits(start);
+ if (end_word == start_word) {
+ mask &= ethnl_lower_bits(end);
+ if (dst[start_word] & mask) {
+ dst[start_word] &= ~mask;
+ *mod = true;
+ }
+ return;
+ }
+ if (dst[start_word] & mask) {
+ dst[start_word] &= ~mask;
+ *mod = true;
+ }
+ start_word++;
+ }
+
+ for (i = start_word; i < end_word; i++) {
+ if (dst[i]) {
+ dst[i] = 0;
+ *mod = true;
+ }
+ }
+ if (end % 32) {
+ mask = ethnl_lower_bits(end);
+ if (dst[end_word] & mask) {
+ dst[end_word] &= ~mask;
+ *mod = true;
+ }
+ }
+}
+
+/**
+ * ethnl_bitmap32_not_zero() - Check if any bit is set in an interval
+ * @map: bitmap to test
+ * @start: beginning of the interval
+ * @end: end of the interval
+ *
+ * Return: true if there is non-zero bit with index @start <= i < @end,
+ * false if the whole interval is zero
+ */
+static bool ethnl_bitmap32_not_zero(const u32 *map, unsigned int start,
+ unsigned int end)
+{
+ unsigned int start_word = start / 32;
+ unsigned int end_word = end / 32;
+ u32 mask;
+
+ if (end <= start)
+ return true;
+
+ if (start % 32) {
+ mask = ethnl_upper_bits(start);
+ if (end_word == start_word) {
+ mask &= ethnl_lower_bits(end);
+ return map[start_word] & mask;
+ }
+ if (map[start_word] & mask)
+ return true;
+ start_word++;
+ }
+
+ if (!memchr_inv(map + start_word, '\0',
+ (end_word - start_word) * sizeof(u32)))
+ return true;
+ if (end % 32 == 0)
+ return true;
+ return map[end_word] & ethnl_lower_bits(end);
+}
+
+/**
+ * ethnl_bitmap32_update() - Modify u32 based bitmap according to value/mask
+ * pair
+ * @dst: bitmap to update
+ * @nbits: bit size of the bitmap
+ * @value: values to set
+ * @mask: mask of bits to set
+ * @mod: set to true if bitmap is modified, preserve if not
+ *
+ * Set bits in @dst bitmap which are set in @mask to values from @value, leave
+ * the rest untouched. If destination bitmap was modified, set @mod to true,
+ * leave as it is if not.
+ */
+static void ethnl_bitmap32_update(u32 *dst, unsigned int nbits,
+ const u32 *value, const u32 *mask, bool *mod)
+{
+ while (nbits > 0) {
+ u32 real_mask = mask ? *mask : ~(u32)0;
+ u32 new_value;
+
+ if (nbits < 32)
+ real_mask &= ethnl_lower_bits(nbits);
+ new_value = (*dst & ~real_mask) | (*value & real_mask);
+ if (new_value != *dst) {
+ *dst = new_value;
+ *mod = true;
+ }
+
+ if (nbits <= 32)
+ break;
+ dst++;
+ nbits -= 32;
+ value++;
+ if (mask)
+ mask++;
+ }
+}
+
+static bool ethnl_bitmap32_test_bit(const u32 *map, unsigned int index)
+{
+ return map[index / 32] & (1U << (index % 32));
+}
+
+/**
+ * ethnl_bitset32_size() - Calculate size of bitset nested attribute
+ * @val: value bitmap (u32 based)
+ * @mask: mask bitmap (u32 based, optional)
+ * @nbits: bit length of the bitset
+ * @names: array of bit names (optional)
+ * @compact: assume compact format for output
+ *
+ * Estimate length of netlink attribute composed by a later call to
+ * ethnl_put_bitset32() call with the same arguments.
+ *
+ * Return: negative error code or attribute length estimate
+ */
+int ethnl_bitset32_size(const u32 *val, const u32 *mask, unsigned int nbits,
+ ethnl_string_array_t names, bool compact)
+{
+ unsigned int len = 0;
+
+ /* list flag */
+ if (!mask)
+ len += nla_total_size(sizeof(u32));
+ /* size */
+ len += nla_total_size(sizeof(u32));
+
+ if (compact) {
+ unsigned int nwords = DIV_ROUND_UP(nbits, 32);
+
+ /* value, mask */
+ len += (mask ? 2 : 1) * nla_total_size(nwords * sizeof(u32));
+ } else {
+ unsigned int bits_len = 0;
+ unsigned int bit_len, i;
+
+ for (i = 0; i < nbits; i++) {
+ const char *name = names ? names[i] : NULL;
+
+ if (!ethnl_bitmap32_test_bit(mask ?: val, i))
+ continue;
+ /* index */
+ bit_len = nla_total_size(sizeof(u32));
+ /* name */
+ if (name)
+ bit_len += ethnl_strz_size(name);
+ /* value */
+ if (mask && ethnl_bitmap32_test_bit(val, i))
+ bit_len += nla_total_size(0);
+
+ /* bit nest */
+ bits_len += nla_total_size(bit_len);
+ }
+ /* bits nest */
+ len += nla_total_size(bits_len);
+ }
+
+ /* outermost nest */
+ return nla_total_size(len);
+}
+
+/**
+ * ethnl_put_bitset32() - Put a bitset nest into a message
+ * @skb: skb with the message
+ * @attrtype: attribute type for the bitset nest
+ * @val: value bitmap (u32 based)
+ * @mask: mask bitmap (u32 based, optional)
+ * @nbits: bit length of the bitset
+ * @names: array of bit names (optional)
+ * @compact: use compact format for the output
+ *
+ * Compose a nested attribute representing a bitset. If @mask is null, simple
+ * bitmap (bit list) is created, if @mask is provided, represent a value/mask
+ * pair. Bit names are only used in verbose mode and when provided by calller.
+ *
+ * Return: 0 on success, negative error value on error
+ */
+int ethnl_put_bitset32(struct sk_buff *skb, int attrtype, const u32 *val,
+ const u32 *mask, unsigned int nbits,
+ ethnl_string_array_t names, bool compact)
+{
+ struct nlattr *nest;
+ struct nlattr *attr;
+
+ nest = nla_nest_start(skb, attrtype);
+ if (!nest)
+ return -EMSGSIZE;
+
+ if (!mask && nla_put_flag(skb, ETHTOOL_A_BITSET_NOMASK))
+ goto nla_put_failure;
+ if (nla_put_u32(skb, ETHTOOL_A_BITSET_SIZE, nbits))
+ goto nla_put_failure;
+ if (compact) {
+ unsigned int nwords = DIV_ROUND_UP(nbits, 32);
+ unsigned int nbytes = nwords * sizeof(u32);
+ u32 *dst;
+
+ attr = nla_reserve(skb, ETHTOOL_A_BITSET_VALUE, nbytes);
+ if (!attr)
+ goto nla_put_failure;
+ dst = nla_data(attr);
+ memcpy(dst, val, nbytes);
+ if (nbits % 32)
+ dst[nwords - 1] &= ethnl_lower_bits(nbits);
+
+ if (mask) {
+ attr = nla_reserve(skb, ETHTOOL_A_BITSET_MASK, nbytes);
+ if (!attr)
+ goto nla_put_failure;
+ dst = nla_data(attr);
+ memcpy(dst, mask, nbytes);
+ if (nbits % 32)
+ dst[nwords - 1] &= ethnl_lower_bits(nbits);
+ }
+ } else {
+ struct nlattr *bits;
+ unsigned int i;
+
+ bits = nla_nest_start(skb, ETHTOOL_A_BITSET_BITS);
+ if (!bits)
+ goto nla_put_failure;
+ for (i = 0; i < nbits; i++) {
+ const char *name = names ? names[i] : NULL;
+
+ if (!ethnl_bitmap32_test_bit(mask ?: val, i))
+ continue;
+ attr = nla_nest_start(skb, ETHTOOL_A_BITSET_BITS_BIT);
+ if (!attr)
+ goto nla_put_failure;
+ if (nla_put_u32(skb, ETHTOOL_A_BITSET_BIT_INDEX, i))
+ goto nla_put_failure;
+ if (name &&
+ ethnl_put_strz(skb, ETHTOOL_A_BITSET_BIT_NAME, name))
+ goto nla_put_failure;
+ if (mask && ethnl_bitmap32_test_bit(val, i) &&
+ nla_put_flag(skb, ETHTOOL_A_BITSET_BIT_VALUE))
+ goto nla_put_failure;
+ nla_nest_end(skb, attr);
+ }
+ nla_nest_end(skb, bits);
+ }
+
+ nla_nest_end(skb, nest);
+ return 0;
+
+nla_put_failure:
+ nla_nest_cancel(skb, nest);
+ return -EMSGSIZE;
+}
+
+static const struct nla_policy bitset_policy[] = {
+ [ETHTOOL_A_BITSET_NOMASK] = { .type = NLA_FLAG },
+ [ETHTOOL_A_BITSET_SIZE] = NLA_POLICY_MAX(NLA_U32,
+ ETHNL_MAX_BITSET_SIZE),
+ [ETHTOOL_A_BITSET_BITS] = { .type = NLA_NESTED },
+ [ETHTOOL_A_BITSET_VALUE] = { .type = NLA_BINARY },
+ [ETHTOOL_A_BITSET_MASK] = { .type = NLA_BINARY },
+};
+
+static const struct nla_policy bit_policy[] = {
+ [ETHTOOL_A_BITSET_BIT_INDEX] = { .type = NLA_U32 },
+ [ETHTOOL_A_BITSET_BIT_NAME] = { .type = NLA_NUL_STRING },
+ [ETHTOOL_A_BITSET_BIT_VALUE] = { .type = NLA_FLAG },
+};
+
+/**
+ * ethnl_bitset_is_compact() - check if bitset attribute represents a compact
+ * bitset
+ * @bitset: nested attribute representing a bitset
+ * @compact: pointer for return value
+ *
+ * Return: 0 on success, negative error code on failure
+ */
+int ethnl_bitset_is_compact(const struct nlattr *bitset, bool *compact)
+{
+ struct nlattr *tb[ARRAY_SIZE(bitset_policy)];
+ int ret;
+
+ ret = nla_parse_nested(tb, ARRAY_SIZE(bitset_policy) - 1, bitset,
+ bitset_policy, NULL);
+ if (ret < 0)
+ return ret;
+
+ if (tb[ETHTOOL_A_BITSET_BITS]) {
+ if (tb[ETHTOOL_A_BITSET_VALUE] || tb[ETHTOOL_A_BITSET_MASK])
+ return -EINVAL;
+ *compact = false;
+ return 0;
+ }
+ if (!tb[ETHTOOL_A_BITSET_SIZE] || !tb[ETHTOOL_A_BITSET_VALUE])
+ return -EINVAL;
+
+ *compact = true;
+ return 0;
+}
+
+/**
+ * ethnl_name_to_idx() - look up string index for a name
+ * @names: array of ETH_GSTRING_LEN sized strings
+ * @n_names: number of strings in the array
+ * @name: name to look up
+ *
+ * Return: index of the string if found, -ENOENT if not found
+ */
+static int ethnl_name_to_idx(ethnl_string_array_t names, unsigned int n_names,
+ const char *name)
+{
+ unsigned int i;
+
+ if (!names)
+ return -ENOENT;
+
+ for (i = 0; i < n_names; i++) {
+ /* names[i] may not be null terminated */
+ if (!strncmp(names[i], name, ETH_GSTRING_LEN) &&
+ strlen(name) <= ETH_GSTRING_LEN)
+ return i;
+ }
+
+ return -ENOENT;
+}
+
+static int ethnl_parse_bit(unsigned int *index, bool *val, unsigned int nbits,
+ const struct nlattr *bit_attr, bool no_mask,
+ ethnl_string_array_t names,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[ARRAY_SIZE(bit_policy)];
+ int ret, idx;
+
+ ret = nla_parse_nested(tb, ARRAY_SIZE(bit_policy) - 1, bit_attr,
+ bit_policy, extack);
+ if (ret < 0)
+ return ret;
+
+ if (tb[ETHTOOL_A_BITSET_BIT_INDEX]) {
+ const char *name;
+
+ idx = nla_get_u32(tb[ETHTOOL_A_BITSET_BIT_INDEX]);
+ if (idx >= nbits) {
+ NL_SET_ERR_MSG_ATTR(extack,
+ tb[ETHTOOL_A_BITSET_BIT_INDEX],
+ "bit index too high");
+ return -EOPNOTSUPP;
+ }
+ name = names ? names[idx] : NULL;
+ if (tb[ETHTOOL_A_BITSET_BIT_NAME] && name &&
+ strncmp(nla_data(tb[ETHTOOL_A_BITSET_BIT_NAME]), name,
+ nla_len(tb[ETHTOOL_A_BITSET_BIT_NAME]))) {
+ NL_SET_ERR_MSG_ATTR(extack, bit_attr,
+ "bit index and name mismatch");
+ return -EINVAL;
+ }
+ } else if (tb[ETHTOOL_A_BITSET_BIT_NAME]) {
+ idx = ethnl_name_to_idx(names, nbits,
+ nla_data(tb[ETHTOOL_A_BITSET_BIT_NAME]));
+ if (idx < 0) {
+ NL_SET_ERR_MSG_ATTR(extack,
+ tb[ETHTOOL_A_BITSET_BIT_NAME],
+ "bit name not found");
+ return -EOPNOTSUPP;
+ }
+ } else {
+ NL_SET_ERR_MSG_ATTR(extack, bit_attr,
+ "neither bit index nor name specified");
+ return -EINVAL;
+ }
+
+ *index = idx;
+ *val = no_mask || tb[ETHTOOL_A_BITSET_BIT_VALUE];
+ return 0;
+}
+
+static int
+ethnl_update_bitset32_verbose(u32 *bitmap, unsigned int nbits,
+ const struct nlattr *attr, struct nlattr **tb,
+ ethnl_string_array_t names,
+ struct netlink_ext_ack *extack, bool *mod)
+{
+ struct nlattr *bit_attr;
+ bool no_mask;
+ int rem;
+ int ret;
+
+ if (tb[ETHTOOL_A_BITSET_VALUE]) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_VALUE],
+ "value only allowed in compact bitset");
+ return -EINVAL;
+ }
+ if (tb[ETHTOOL_A_BITSET_MASK]) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
+ "mask only allowed in compact bitset");
+ return -EINVAL;
+ }
+
+ no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
+ if (no_mask)
+ ethnl_bitmap32_clear(bitmap, 0, nbits, mod);
+
+ nla_for_each_nested(bit_attr, tb[ETHTOOL_A_BITSET_BITS], rem) {
+ bool old_val, new_val;
+ unsigned int idx;
+
+ if (nla_type(bit_attr) != ETHTOOL_A_BITSET_BITS_BIT) {
+ NL_SET_ERR_MSG_ATTR(extack, bit_attr,
+ "only ETHTOOL_A_BITSET_BITS_BIT allowed in ETHTOOL_A_BITSET_BITS");
+ return -EINVAL;
+ }
+ ret = ethnl_parse_bit(&idx, &new_val, nbits, bit_attr, no_mask,
+ names, extack);
+ if (ret < 0)
+ return ret;
+ old_val = bitmap[idx / 32] & ((u32)1 << (idx % 32));
+ if (new_val != old_val) {
+ if (new_val)
+ bitmap[idx / 32] |= ((u32)1 << (idx % 32));
+ else
+ bitmap[idx / 32] &= ~((u32)1 << (idx % 32));
+ *mod = true;
+ }
+ }
+
+ return 0;
+}
+
+static int ethnl_compact_sanity_checks(unsigned int nbits,
+ const struct nlattr *nest,
+ struct nlattr **tb,
+ struct netlink_ext_ack *extack)
+{
+ bool no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
+ unsigned int attr_nbits, attr_nwords;
+ const struct nlattr *test_attr;
+
+ if (no_mask && tb[ETHTOOL_A_BITSET_MASK]) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
+ "mask not allowed in list bitset");
+ return -EINVAL;
+ }
+ if (!tb[ETHTOOL_A_BITSET_SIZE]) {
+ NL_SET_ERR_MSG_ATTR(extack, nest,
+ "missing size in compact bitset");
+ return -EINVAL;
+ }
+ if (!tb[ETHTOOL_A_BITSET_VALUE]) {
+ NL_SET_ERR_MSG_ATTR(extack, nest,
+ "missing value in compact bitset");
+ return -EINVAL;
+ }
+ if (!no_mask && !tb[ETHTOOL_A_BITSET_MASK]) {
+ NL_SET_ERR_MSG_ATTR(extack, nest,
+ "missing mask in compact nonlist bitset");
+ return -EINVAL;
+ }
+
+ attr_nbits = nla_get_u32(tb[ETHTOOL_A_BITSET_SIZE]);
+ attr_nwords = DIV_ROUND_UP(attr_nbits, 32);
+ if (nla_len(tb[ETHTOOL_A_BITSET_VALUE]) != attr_nwords * sizeof(u32)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_VALUE],
+ "bitset value length does not match size");
+ return -EINVAL;
+ }
+ if (tb[ETHTOOL_A_BITSET_MASK] &&
+ nla_len(tb[ETHTOOL_A_BITSET_MASK]) != attr_nwords * sizeof(u32)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
+ "bitset mask length does not match size");
+ return -EINVAL;
+ }
+ if (attr_nbits <= nbits)
+ return 0;
+
+ test_attr = no_mask ? tb[ETHTOOL_A_BITSET_VALUE] :
+ tb[ETHTOOL_A_BITSET_MASK];
+ if (ethnl_bitmap32_not_zero(nla_data(test_attr), nbits, attr_nbits)) {
+ NL_SET_ERR_MSG_ATTR(extack, test_attr,
+ "cannot modify bits past kernel bitset size");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/**
+ * ethnl_update_bitset32() - Apply a bitset nest to a u32 based bitmap
+ * @bitmap: bitmap to update
+ * @nbits: size of the updated bitmap in bits
+ * @attr: nest attribute to parse and apply
+ * @names: array of bit names; may be null for compact format
+ * @extack: extack for error reporting
+ * @mod: set this to true if bitmap is modified, leave as it is if not
+ *
+ * Apply bitset netsted attribute to a bitmap. If the attribute represents
+ * a bit list, @bitmap is set to its contents; otherwise, bits in mask are
+ * set to values from value. Bitmaps in the attribute may be longer than
+ * @nbits but the message must not request modifying any bits past @nbits.
+ *
+ * Return: negative error code on failure, 0 on success
+ */
+int ethnl_update_bitset32(u32 *bitmap, unsigned int nbits,
+ const struct nlattr *attr, ethnl_string_array_t names,
+ struct netlink_ext_ack *extack, bool *mod)
+{
+ struct nlattr *tb[ARRAY_SIZE(bitset_policy)];
+ unsigned int change_bits;
+ bool no_mask;
+ int ret;
+
+ if (!attr)
+ return 0;
+ ret = nla_parse_nested(tb, ARRAY_SIZE(bitset_policy) - 1, attr,
+ bitset_policy, extack);
+ if (ret < 0)
+ return ret;
+
+ if (tb[ETHTOOL_A_BITSET_BITS])
+ return ethnl_update_bitset32_verbose(bitmap, nbits, attr, tb,
+ names, extack, mod);
+ ret = ethnl_compact_sanity_checks(nbits, attr, tb, extack);
+ if (ret < 0)
+ return ret;
+
+ no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
+ change_bits = min_t(unsigned int,
+ nla_get_u32(tb[ETHTOOL_A_BITSET_SIZE]), nbits);
+ ethnl_bitmap32_update(bitmap, change_bits,
+ nla_data(tb[ETHTOOL_A_BITSET_VALUE]),
+ no_mask ? NULL :
+ nla_data(tb[ETHTOOL_A_BITSET_MASK]),
+ mod);
+ if (no_mask && change_bits < nbits)
+ ethnl_bitmap32_clear(bitmap, change_bits, nbits, mod);
+
+ return 0;
+}
+
+/**
+ * ethnl_parse_bitset() - Compute effective value and mask from bitset nest
+ * @val: unsigned long based bitmap to put value into
+ * @mask: unsigned long based bitmap to put mask into
+ * @nbits: size of @val and @mask bitmaps
+ * @attr: nest attribute to parse and apply
+ * @names: array of bit names; may be null for compact format
+ * @extack: extack for error reporting
+ *
+ * Provide @nbits size long bitmaps for value and mask so that
+ * x = (val & mask) | (x & ~mask) would modify any @nbits sized bitmap x
+ * the same way ethnl_update_bitset() with the same bitset attribute would.
+ *
+ * Return: negative error code on failure, 0 on success
+ */
+int ethnl_parse_bitset(unsigned long *val, unsigned long *mask,
+ unsigned int nbits, const struct nlattr *attr,
+ ethnl_string_array_t names,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[ARRAY_SIZE(bitset_policy)];
+ const struct nlattr *bit_attr;
+ bool no_mask;
+ int rem;
+ int ret;
+
+ if (!attr)
+ return 0;
+ ret = nla_parse_nested(tb, ARRAY_SIZE(bitset_policy) - 1, attr,
+ bitset_policy, extack);
+ if (ret < 0)
+ return ret;
+ no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
+
+ if (!tb[ETHTOOL_A_BITSET_BITS]) {
+ unsigned int change_bits;
+
+ ret = ethnl_compact_sanity_checks(nbits, attr, tb, extack);
+ if (ret < 0)
+ return ret;
+
+ change_bits = nla_get_u32(tb[ETHTOOL_A_BITSET_SIZE]);
+ if (change_bits > nbits)
+ change_bits = nbits;
+ bitmap_from_arr32(val, nla_data(tb[ETHTOOL_A_BITSET_VALUE]),
+ change_bits);
+ if (change_bits < nbits)
+ bitmap_clear(val, change_bits, nbits - change_bits);
+ if (no_mask) {
+ bitmap_fill(mask, nbits);
+ } else {
+ bitmap_from_arr32(mask,
+ nla_data(tb[ETHTOOL_A_BITSET_MASK]),
+ change_bits);
+ if (change_bits < nbits)
+ bitmap_clear(mask, change_bits,
+ nbits - change_bits);
+ }
+
+ return 0;
+ }
+
+ if (tb[ETHTOOL_A_BITSET_VALUE]) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_VALUE],
+ "value only allowed in compact bitset");
+ return -EINVAL;
+ }
+ if (tb[ETHTOOL_A_BITSET_MASK]) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
+ "mask only allowed in compact bitset");
+ return -EINVAL;
+ }
+
+ bitmap_zero(val, nbits);
+ if (no_mask)
+ bitmap_fill(mask, nbits);
+ else
+ bitmap_zero(mask, nbits);
+
+ nla_for_each_nested(bit_attr, tb[ETHTOOL_A_BITSET_BITS], rem) {
+ unsigned int idx;
+ bool bit_val;
+
+ ret = ethnl_parse_bit(&idx, &bit_val, nbits, bit_attr, no_mask,
+ names, extack);
+ if (ret < 0)
+ return ret;
+ if (bit_val)
+ __set_bit(idx, val);
+ if (!no_mask)
+ __set_bit(idx, mask);
+ }
+
+ return 0;
+}
+
+#if BITS_PER_LONG == 64 && defined(__BIG_ENDIAN)
+
+/* 64-bit big endian architectures are the only case when u32 based bitmaps
+ * and unsigned long based bitmaps have different memory layout so that we
+ * cannot simply cast the latter to the former and need actual wrappers
+ * converting the latter to the former.
+ *
+ * To reduce the number of slab allocations, the wrappers use fixed size local
+ * variables for bitmaps up to ETHNL_SMALL_BITMAP_BITS bits which is the
+ * majority of bitmaps used by ethtool.
+ */
+#define ETHNL_SMALL_BITMAP_BITS 128
+#define ETHNL_SMALL_BITMAP_WORDS DIV_ROUND_UP(ETHNL_SMALL_BITMAP_BITS, 32)
+
+int ethnl_bitset_size(const unsigned long *val, const unsigned long *mask,
+ unsigned int nbits, ethnl_string_array_t names,
+ bool compact)
+{
+ u32 small_mask32[ETHNL_SMALL_BITMAP_WORDS];
+ u32 small_val32[ETHNL_SMALL_BITMAP_WORDS];
+ u32 *mask32;
+ u32 *val32;
+ int ret;
+
+ if (nbits > ETHNL_SMALL_BITMAP_BITS) {
+ unsigned int nwords = DIV_ROUND_UP(nbits, 32);
+
+ val32 = kmalloc_array(2 * nwords, sizeof(u32), GFP_KERNEL);
+ if (!val32)
+ return -ENOMEM;
+ mask32 = val32 + nwords;
+ } else {
+ val32 = small_val32;
+ mask32 = small_mask32;
+ }
+
+ bitmap_to_arr32(val32, val, nbits);
+ if (mask)
+ bitmap_to_arr32(mask32, mask, nbits);
+ else
+ mask32 = NULL;
+ ret = ethnl_bitset32_size(val32, mask32, nbits, names, compact);
+
+ if (nbits > ETHNL_SMALL_BITMAP_BITS)
+ kfree(val32);
+
+ return ret;
+}
+
+int ethnl_put_bitset(struct sk_buff *skb, int attrtype,
+ const unsigned long *val, const unsigned long *mask,
+ unsigned int nbits, ethnl_string_array_t names,
+ bool compact)
+{
+ u32 small_mask32[ETHNL_SMALL_BITMAP_WORDS];
+ u32 small_val32[ETHNL_SMALL_BITMAP_WORDS];
+ u32 *mask32;
+ u32 *val32;
+ int ret;
+
+ if (nbits > ETHNL_SMALL_BITMAP_BITS) {
+ unsigned int nwords = DIV_ROUND_UP(nbits, 32);
+
+ val32 = kmalloc_array(2 * nwords, sizeof(u32), GFP_KERNEL);
+ if (!val32)
+ return -ENOMEM;
+ mask32 = val32 + nwords;
+ } else {
+ val32 = small_val32;
+ mask32 = small_mask32;
+ }
+
+ bitmap_to_arr32(val32, val, nbits);
+ if (mask)
+ bitmap_to_arr32(mask32, mask, nbits);
+ else
+ mask32 = NULL;
+ ret = ethnl_put_bitset32(skb, attrtype, val32, mask32, nbits, names,
+ compact);
+
+ if (nbits > ETHNL_SMALL_BITMAP_BITS)
+ kfree(val32);
+
+ return ret;
+}
+
+int ethnl_update_bitset(unsigned long *bitmap, unsigned int nbits,
+ const struct nlattr *attr, ethnl_string_array_t names,
+ struct netlink_ext_ack *extack, bool *mod)
+{
+ u32 small_bitmap32[ETHNL_SMALL_BITMAP_WORDS];
+ u32 *bitmap32 = small_bitmap32;
+ bool u32_mod = false;
+ int ret;
+
+ if (nbits > ETHNL_SMALL_BITMAP_BITS) {
+ unsigned int dst_words = DIV_ROUND_UP(nbits, 32);
+
+ bitmap32 = kmalloc_array(dst_words, sizeof(u32), GFP_KERNEL);
+ if (!bitmap32)
+ return -ENOMEM;
+ }
+
+ bitmap_to_arr32(bitmap32, bitmap, nbits);
+ ret = ethnl_update_bitset32(bitmap32, nbits, attr, names, extack,
+ &u32_mod);
+ if (u32_mod) {
+ bitmap_from_arr32(bitmap, bitmap32, nbits);
+ *mod = true;
+ }
+
+ if (nbits > ETHNL_SMALL_BITMAP_BITS)
+ kfree(bitmap32);
+
+ return ret;
+}
+
+#else
+
+/* On little endian 64-bit and all 32-bit architectures, an unsigned long
+ * based bitmap can be interpreted as u32 based one using a simple cast.
+ */
+
+int ethnl_bitset_size(const unsigned long *val, const unsigned long *mask,
+ unsigned int nbits, ethnl_string_array_t names,
+ bool compact)
+{
+ return ethnl_bitset32_size((const u32 *)val, (const u32 *)mask, nbits,
+ names, compact);
+}
+
+int ethnl_put_bitset(struct sk_buff *skb, int attrtype,
+ const unsigned long *val, const unsigned long *mask,
+ unsigned int nbits, ethnl_string_array_t names,
+ bool compact)
+{
+ return ethnl_put_bitset32(skb, attrtype, (const u32 *)val,
+ (const u32 *)mask, nbits, names, compact);
+}
+
+int ethnl_update_bitset(unsigned long *bitmap, unsigned int nbits,
+ const struct nlattr *attr, ethnl_string_array_t names,
+ struct netlink_ext_ack *extack, bool *mod)
+{
+ return ethnl_update_bitset32((u32 *)bitmap, nbits, attr, names, extack,
+ mod);
+}
+
+#endif /* BITS_PER_LONG == 64 && defined(__BIG_ENDIAN) */