| 1 | // SPDX-License-Identifier: GPL-2.0-only | 
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| 2 |  | 
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| 3 | #include <net/netdev_lock.h> | 
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| 4 |  | 
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| 5 | #include "netlink.h" | 
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| 6 | #include "common.h" | 
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| 7 | #include "bitset.h" | 
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| 8 |  | 
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| 9 | struct features_req_info { | 
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| 10 | struct ethnl_req_info	base; | 
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| 11 | }; | 
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| 12 |  | 
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| 13 | struct features_reply_data { | 
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| 14 | struct ethnl_reply_data	base; | 
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| 15 | u32			hw[ETHTOOL_DEV_FEATURE_WORDS]; | 
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| 16 | u32			wanted[ETHTOOL_DEV_FEATURE_WORDS]; | 
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| 17 | u32			active[ETHTOOL_DEV_FEATURE_WORDS]; | 
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| 18 | u32			nochange[ETHTOOL_DEV_FEATURE_WORDS]; | 
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| 19 | u32			all[ETHTOOL_DEV_FEATURE_WORDS]; | 
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| 20 | }; | 
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| 21 |  | 
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| 22 | #define FEATURES_REPDATA(__reply_base) \ | 
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| 23 | container_of(__reply_base, struct features_reply_data, base) | 
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| 24 |  | 
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| 25 | const struct nla_policy ethnl_features_get_policy[] = { | 
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| 26 | [ETHTOOL_A_FEATURES_HEADER]	= | 
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| 27 | NLA_POLICY_NESTED(ethnl_header_policy), | 
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| 28 | }; | 
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| 29 |  | 
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| 30 | static void ethnl_features_to_bitmap32(u32 *dest, netdev_features_t src) | 
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| 31 | { | 
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| 32 | unsigned int i; | 
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| 33 |  | 
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| 34 | for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; i++) | 
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| 35 | dest[i] = src >> (32 * i); | 
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| 36 | } | 
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| 37 |  | 
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| 38 | static int features_prepare_data(const struct ethnl_req_info *req_base, | 
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| 39 | struct ethnl_reply_data *reply_base, | 
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| 40 | const struct genl_info *info) | 
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| 41 | { | 
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| 42 | struct features_reply_data *data = FEATURES_REPDATA(reply_base); | 
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| 43 | struct net_device *dev = reply_base->dev; | 
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| 44 | netdev_features_t all_features; | 
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| 45 |  | 
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| 46 | ethnl_features_to_bitmap32(dest: data->hw, src: dev->hw_features); | 
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| 47 | ethnl_features_to_bitmap32(dest: data->wanted, src: dev->wanted_features); | 
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| 48 | ethnl_features_to_bitmap32(dest: data->active, src: dev->features); | 
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| 49 | ethnl_features_to_bitmap32(dest: data->nochange, NETIF_F_NEVER_CHANGE); | 
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| 50 | all_features = GENMASK_ULL(NETDEV_FEATURE_COUNT - 1, 0); | 
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| 51 | ethnl_features_to_bitmap32(dest: data->all, src: all_features); | 
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| 52 |  | 
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| 53 | return 0; | 
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| 54 | } | 
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| 55 |  | 
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| 56 | static int features_reply_size(const struct ethnl_req_info *req_base, | 
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| 57 | const struct ethnl_reply_data *reply_base) | 
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| 58 | { | 
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| 59 | const struct features_reply_data *data = FEATURES_REPDATA(reply_base); | 
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| 60 | bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS; | 
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| 61 | unsigned int len = 0; | 
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| 62 | int ret; | 
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| 63 |  | 
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| 64 | ret = ethnl_bitset32_size(val: data->hw, mask: data->all, nbits: NETDEV_FEATURE_COUNT, | 
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| 65 | names: netdev_features_strings, compact); | 
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| 66 | if (ret < 0) | 
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| 67 | return ret; | 
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| 68 | len += ret; | 
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| 69 | ret = ethnl_bitset32_size(val: data->wanted, NULL, nbits: NETDEV_FEATURE_COUNT, | 
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| 70 | names: netdev_features_strings, compact); | 
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| 71 | if (ret < 0) | 
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| 72 | return ret; | 
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| 73 | len += ret; | 
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| 74 | ret = ethnl_bitset32_size(val: data->active, NULL, nbits: NETDEV_FEATURE_COUNT, | 
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| 75 | names: netdev_features_strings, compact); | 
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| 76 | if (ret < 0) | 
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| 77 | return ret; | 
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| 78 | len += ret; | 
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| 79 | ret = ethnl_bitset32_size(val: data->nochange, NULL, nbits: NETDEV_FEATURE_COUNT, | 
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| 80 | names: netdev_features_strings, compact); | 
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| 81 | if (ret < 0) | 
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| 82 | return ret; | 
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| 83 | len += ret; | 
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| 84 |  | 
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| 85 | return len; | 
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| 86 | } | 
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| 87 |  | 
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| 88 | static int features_fill_reply(struct sk_buff *skb, | 
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| 89 | const struct ethnl_req_info *req_base, | 
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| 90 | const struct ethnl_reply_data *reply_base) | 
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| 91 | { | 
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| 92 | const struct features_reply_data *data = FEATURES_REPDATA(reply_base); | 
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| 93 | bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS; | 
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| 94 | int ret; | 
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| 95 |  | 
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| 96 | ret = ethnl_put_bitset32(skb, attrtype: ETHTOOL_A_FEATURES_HW, val: data->hw, | 
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| 97 | mask: data->all, nbits: NETDEV_FEATURE_COUNT, | 
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| 98 | names: netdev_features_strings, compact); | 
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| 99 | if (ret < 0) | 
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| 100 | return ret; | 
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| 101 | ret = ethnl_put_bitset32(skb, attrtype: ETHTOOL_A_FEATURES_WANTED, val: data->wanted, | 
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| 102 | NULL, nbits: NETDEV_FEATURE_COUNT, | 
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| 103 | names: netdev_features_strings, compact); | 
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| 104 | if (ret < 0) | 
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| 105 | return ret; | 
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| 106 | ret = ethnl_put_bitset32(skb, attrtype: ETHTOOL_A_FEATURES_ACTIVE, val: data->active, | 
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| 107 | NULL, nbits: NETDEV_FEATURE_COUNT, | 
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| 108 | names: netdev_features_strings, compact); | 
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| 109 | if (ret < 0) | 
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| 110 | return ret; | 
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| 111 | return ethnl_put_bitset32(skb, attrtype: ETHTOOL_A_FEATURES_NOCHANGE, | 
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| 112 | val: data->nochange, NULL, nbits: NETDEV_FEATURE_COUNT, | 
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| 113 | names: netdev_features_strings, compact); | 
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| 114 | } | 
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| 115 |  | 
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| 116 | const struct ethnl_request_ops ethnl_features_request_ops = { | 
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| 117 | .request_cmd		= ETHTOOL_MSG_FEATURES_GET, | 
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| 118 | .reply_cmd		= ETHTOOL_MSG_FEATURES_GET_REPLY, | 
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| 119 | .hdr_attr		= ETHTOOL_A_FEATURES_HEADER, | 
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| 120 | .req_info_size		= sizeof(struct features_req_info), | 
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| 121 | .reply_data_size	= sizeof(struct features_reply_data), | 
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| 122 |  | 
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| 123 | .prepare_data		= features_prepare_data, | 
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| 124 | .reply_size		= features_reply_size, | 
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| 125 | .fill_reply		= features_fill_reply, | 
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| 126 | }; | 
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| 127 |  | 
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| 128 | /* FEATURES_SET */ | 
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| 129 |  | 
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| 130 | const struct nla_policy ethnl_features_set_policy[] = { | 
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| 131 | [ETHTOOL_A_FEATURES_HEADER]	= | 
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| 132 | NLA_POLICY_NESTED(ethnl_header_policy), | 
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| 133 | [ETHTOOL_A_FEATURES_WANTED]	= { .type = NLA_NESTED }, | 
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| 134 | }; | 
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| 135 |  | 
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| 136 | static void ethnl_features_to_bitmap(unsigned long *dest, netdev_features_t val) | 
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| 137 | { | 
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| 138 | const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT); | 
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| 139 | unsigned int i; | 
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| 140 |  | 
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| 141 | for (i = 0; i < words; i++) | 
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| 142 | dest[i] = (unsigned long)(val >> (i * BITS_PER_LONG)); | 
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| 143 | } | 
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| 144 |  | 
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| 145 | static netdev_features_t ethnl_bitmap_to_features(unsigned long *src) | 
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| 146 | { | 
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| 147 | const unsigned int nft_bits = sizeof(netdev_features_t) * BITS_PER_BYTE; | 
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| 148 | const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT); | 
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| 149 | netdev_features_t ret = 0; | 
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| 150 | unsigned int i; | 
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| 151 |  | 
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| 152 | for (i = 0; i < words; i++) | 
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| 153 | ret |= (netdev_features_t)(src[i]) << (i * BITS_PER_LONG); | 
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| 154 | ret &= ~(netdev_features_t)0 >> (nft_bits - NETDEV_FEATURE_COUNT); | 
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| 155 | return ret; | 
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| 156 | } | 
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| 157 |  | 
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| 158 | static int features_send_reply(struct net_device *dev, struct genl_info *info, | 
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| 159 | const unsigned long *wanted, | 
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| 160 | const unsigned long *wanted_mask, | 
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| 161 | const unsigned long *active, | 
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| 162 | const unsigned long *active_mask, bool compact) | 
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| 163 | { | 
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| 164 | struct sk_buff *rskb; | 
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| 165 | void *reply_payload; | 
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| 166 | int reply_len = 0; | 
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| 167 | int ret; | 
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| 168 |  | 
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| 169 | reply_len = ethnl_reply_header_size(); | 
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| 170 | ret = ethnl_bitset_size(val: wanted, mask: wanted_mask, nbits: NETDEV_FEATURE_COUNT, | 
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| 171 | names: netdev_features_strings, compact); | 
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| 172 | if (ret < 0) | 
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| 173 | goto err; | 
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| 174 | reply_len += ret; | 
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| 175 | ret = ethnl_bitset_size(val: active, mask: active_mask, nbits: NETDEV_FEATURE_COUNT, | 
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| 176 | names: netdev_features_strings, compact); | 
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| 177 | if (ret < 0) | 
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| 178 | goto err; | 
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| 179 | reply_len += ret; | 
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| 180 |  | 
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| 181 | ret = -ENOMEM; | 
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| 182 | rskb = ethnl_reply_init(payload: reply_len, dev, cmd: ETHTOOL_MSG_FEATURES_SET_REPLY, | 
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| 183 | hdr_attrtype: ETHTOOL_A_FEATURES_HEADER, info, | 
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| 184 | ehdrp: &reply_payload); | 
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| 185 | if (!rskb) | 
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| 186 | goto err; | 
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| 187 |  | 
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| 188 | ret = ethnl_put_bitset(skb: rskb, attrtype: ETHTOOL_A_FEATURES_WANTED, val: wanted, | 
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| 189 | mask: wanted_mask, nbits: NETDEV_FEATURE_COUNT, | 
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| 190 | names: netdev_features_strings, compact); | 
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| 191 | if (ret < 0) | 
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| 192 | goto nla_put_failure; | 
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| 193 | ret = ethnl_put_bitset(skb: rskb, attrtype: ETHTOOL_A_FEATURES_ACTIVE, val: active, | 
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| 194 | mask: active_mask, nbits: NETDEV_FEATURE_COUNT, | 
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| 195 | names: netdev_features_strings, compact); | 
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| 196 | if (ret < 0) | 
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| 197 | goto nla_put_failure; | 
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| 198 |  | 
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| 199 | genlmsg_end(skb: rskb, hdr: reply_payload); | 
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| 200 | ret = genlmsg_reply(skb: rskb, info); | 
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| 201 | return ret; | 
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| 202 |  | 
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| 203 | nla_put_failure: | 
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| 204 | nlmsg_free(skb: rskb); | 
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| 205 | WARN_ONCE(1, "calculated message payload length (%d) not sufficient\n", | 
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| 206 | reply_len); | 
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| 207 | err: | 
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| 208 | GENL_SET_ERR_MSG(info, "failed to send reply message"); | 
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| 209 | return ret; | 
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| 210 | } | 
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| 211 |  | 
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| 212 | int ethnl_set_features(struct sk_buff *skb, struct genl_info *info) | 
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| 213 | { | 
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| 214 | DECLARE_BITMAP(wanted_diff_mask, NETDEV_FEATURE_COUNT); | 
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| 215 | DECLARE_BITMAP(active_diff_mask, NETDEV_FEATURE_COUNT); | 
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| 216 | DECLARE_BITMAP(old_active, NETDEV_FEATURE_COUNT); | 
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| 217 | DECLARE_BITMAP(old_wanted, NETDEV_FEATURE_COUNT); | 
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| 218 | DECLARE_BITMAP(new_active, NETDEV_FEATURE_COUNT); | 
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| 219 | DECLARE_BITMAP(new_wanted, NETDEV_FEATURE_COUNT); | 
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| 220 | DECLARE_BITMAP(req_wanted, NETDEV_FEATURE_COUNT); | 
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| 221 | DECLARE_BITMAP(req_mask, NETDEV_FEATURE_COUNT); | 
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| 222 | struct ethnl_req_info req_info = {}; | 
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| 223 | struct nlattr **tb = info->attrs; | 
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| 224 | struct net_device *dev; | 
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| 225 | bool mod; | 
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| 226 | int ret; | 
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| 227 |  | 
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| 228 | if (!tb[ETHTOOL_A_FEATURES_WANTED]) | 
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| 229 | return -EINVAL; | 
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| 230 | ret = ethnl_parse_header_dev_get(req_info: &req_info, | 
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| 231 | nest: tb[ETHTOOL_A_FEATURES_HEADER], | 
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| 232 | net: genl_info_net(info), extack: info->extack, | 
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| 233 | require_dev: true); | 
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| 234 | if (ret < 0) | 
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| 235 | return ret; | 
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| 236 | dev = req_info.dev; | 
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| 237 |  | 
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| 238 | rtnl_lock(); | 
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| 239 | netdev_lock_ops(dev); | 
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| 240 | ret = ethnl_ops_begin(dev); | 
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| 241 | if (ret < 0) | 
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| 242 | goto out_unlock; | 
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| 243 | ethnl_features_to_bitmap(dest: old_active, val: dev->features); | 
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| 244 | ethnl_features_to_bitmap(dest: old_wanted, val: dev->wanted_features); | 
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| 245 | ret = ethnl_parse_bitset(val: req_wanted, mask: req_mask, nbits: NETDEV_FEATURE_COUNT, | 
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| 246 | attr: tb[ETHTOOL_A_FEATURES_WANTED], | 
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| 247 | names: netdev_features_strings, extack: info->extack); | 
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| 248 | if (ret < 0) | 
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| 249 | goto out_ops; | 
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| 250 | if (ethnl_bitmap_to_features(src: req_mask) & ~NETIF_F_ETHTOOL_BITS) { | 
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| 251 | GENL_SET_ERR_MSG(info, "attempt to change non-ethtool features"); | 
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| 252 | ret = -EINVAL; | 
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| 253 | goto out_ops; | 
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| 254 | } | 
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| 255 |  | 
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| 256 | /* set req_wanted bits not in req_mask from old_wanted */ | 
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| 257 | bitmap_and(dst: req_wanted, src1: req_wanted, src2: req_mask, nbits: NETDEV_FEATURE_COUNT); | 
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| 258 | bitmap_andnot(dst: new_wanted, src1: old_wanted, src2: req_mask, nbits: NETDEV_FEATURE_COUNT); | 
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| 259 | bitmap_or(dst: req_wanted, src1: new_wanted, src2: req_wanted, nbits: NETDEV_FEATURE_COUNT); | 
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| 260 | if (!bitmap_equal(src1: req_wanted, src2: old_wanted, nbits: NETDEV_FEATURE_COUNT)) { | 
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| 261 | dev->wanted_features &= ~dev->hw_features; | 
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| 262 | dev->wanted_features |= ethnl_bitmap_to_features(src: req_wanted) & dev->hw_features; | 
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| 263 | __netdev_update_features(dev); | 
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| 264 | } | 
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| 265 | ethnl_features_to_bitmap(dest: new_active, val: dev->features); | 
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| 266 | mod = !bitmap_equal(src1: old_active, src2: new_active, nbits: NETDEV_FEATURE_COUNT); | 
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| 267 |  | 
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| 268 | ret = 0; | 
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| 269 | if (!(req_info.flags & ETHTOOL_FLAG_OMIT_REPLY)) { | 
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| 270 | bool compact = req_info.flags & ETHTOOL_FLAG_COMPACT_BITSETS; | 
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| 271 |  | 
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| 272 | bitmap_xor(dst: wanted_diff_mask, src1: req_wanted, src2: new_active, | 
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| 273 | nbits: NETDEV_FEATURE_COUNT); | 
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| 274 | bitmap_xor(dst: active_diff_mask, src1: old_active, src2: new_active, | 
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| 275 | nbits: NETDEV_FEATURE_COUNT); | 
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| 276 | bitmap_and(dst: wanted_diff_mask, src1: wanted_diff_mask, src2: req_mask, | 
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| 277 | nbits: NETDEV_FEATURE_COUNT); | 
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| 278 | bitmap_and(dst: req_wanted, src1: req_wanted, src2: wanted_diff_mask, | 
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| 279 | nbits: NETDEV_FEATURE_COUNT); | 
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| 280 | bitmap_and(dst: new_active, src1: new_active, src2: active_diff_mask, | 
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| 281 | nbits: NETDEV_FEATURE_COUNT); | 
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| 282 |  | 
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| 283 | ret = features_send_reply(dev, info, wanted: req_wanted, | 
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| 284 | wanted_mask: wanted_diff_mask, active: new_active, | 
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| 285 | active_mask: active_diff_mask, compact); | 
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| 286 | } | 
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| 287 | if (mod) | 
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| 288 | netdev_features_change(dev); | 
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| 289 |  | 
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| 290 | out_ops: | 
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| 291 | ethnl_ops_complete(dev); | 
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| 292 | out_unlock: | 
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| 293 | netdev_unlock_ops(dev); | 
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| 294 | rtnl_unlock(); | 
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| 295 | ethnl_parse_header_dev_put(req_info: &req_info); | 
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| 296 | return ret; | 
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| 297 | } | 
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| 298 |  | 
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