1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include "netlink.h" 4 #include "common.h" 5 6 struct rss_req_info { 7 struct ethnl_req_info base; 8 u32 rss_context; 9 }; 10 11 struct rss_reply_data { 12 struct ethnl_reply_data base; 13 u32 indir_size; 14 u32 hkey_size; 15 u32 hfunc; 16 u32 *indir_table; 17 u8 *hkey; 18 }; 19 20 #define RSS_REQINFO(__req_base) \ 21 container_of(__req_base, struct rss_req_info, base) 22 23 #define RSS_REPDATA(__reply_base) \ 24 container_of(__reply_base, struct rss_reply_data, base) 25 26 const struct nla_policy ethnl_rss_get_policy[] = { 27 [ETHTOOL_A_RSS_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy), 28 [ETHTOOL_A_RSS_CONTEXT] = { .type = NLA_U32 }, 29 }; 30 31 static int 32 rss_parse_request(struct ethnl_req_info *req_info, struct nlattr **tb, 33 struct netlink_ext_ack *extack) 34 { 35 struct rss_req_info *request = RSS_REQINFO(req_info); 36 37 if (tb[ETHTOOL_A_RSS_CONTEXT]) 38 request->rss_context = nla_get_u32(tb[ETHTOOL_A_RSS_CONTEXT]); 39 40 return 0; 41 } 42 43 static int 44 rss_prepare_data(const struct ethnl_req_info *req_base, 45 struct ethnl_reply_data *reply_base, struct genl_info *info) 46 { 47 struct rss_reply_data *data = RSS_REPDATA(reply_base); 48 struct rss_req_info *request = RSS_REQINFO(req_base); 49 struct net_device *dev = reply_base->dev; 50 const struct ethtool_ops *ops; 51 u32 total_size, indir_bytes; 52 u8 dev_hfunc = 0; 53 u8 *rss_config; 54 int ret; 55 56 ops = dev->ethtool_ops; 57 if (!ops->get_rxfh) 58 return -EOPNOTSUPP; 59 60 /* Some drivers don't handle rss_context */ 61 if (request->rss_context && !ops->get_rxfh_context) 62 return -EOPNOTSUPP; 63 64 ret = ethnl_ops_begin(dev); 65 if (ret < 0) 66 return ret; 67 68 data->indir_size = 0; 69 data->hkey_size = 0; 70 if (ops->get_rxfh_indir_size) 71 data->indir_size = ops->get_rxfh_indir_size(dev); 72 if (ops->get_rxfh_key_size) 73 data->hkey_size = ops->get_rxfh_key_size(dev); 74 75 indir_bytes = data->indir_size * sizeof(u32); 76 total_size = indir_bytes + data->hkey_size; 77 rss_config = kzalloc(total_size, GFP_KERNEL); 78 if (!rss_config) { 79 ret = -ENOMEM; 80 goto out_ops; 81 } 82 83 if (data->indir_size) 84 data->indir_table = (u32 *)rss_config; 85 86 if (data->hkey_size) 87 data->hkey = rss_config + indir_bytes; 88 89 if (request->rss_context) 90 ret = ops->get_rxfh_context(dev, data->indir_table, data->hkey, 91 &dev_hfunc, request->rss_context); 92 else 93 ret = ops->get_rxfh(dev, data->indir_table, data->hkey, 94 &dev_hfunc); 95 96 if (ret) 97 goto out_ops; 98 99 data->hfunc = dev_hfunc; 100 out_ops: 101 ethnl_ops_complete(dev); 102 return ret; 103 } 104 105 static int 106 rss_reply_size(const struct ethnl_req_info *req_base, 107 const struct ethnl_reply_data *reply_base) 108 { 109 const struct rss_reply_data *data = RSS_REPDATA(reply_base); 110 int len; 111 112 len = nla_total_size(sizeof(u32)) + /* _RSS_HFUNC */ 113 nla_total_size(sizeof(u32) * data->indir_size) + /* _RSS_INDIR */ 114 nla_total_size(data->hkey_size); /* _RSS_HKEY */ 115 116 return len; 117 } 118 119 static int 120 rss_fill_reply(struct sk_buff *skb, const struct ethnl_req_info *req_base, 121 const struct ethnl_reply_data *reply_base) 122 { 123 const struct rss_reply_data *data = RSS_REPDATA(reply_base); 124 125 if ((data->hfunc && 126 nla_put_u32(skb, ETHTOOL_A_RSS_HFUNC, data->hfunc)) || 127 (data->indir_size && 128 nla_put(skb, ETHTOOL_A_RSS_INDIR, 129 sizeof(u32) * data->indir_size, data->indir_table)) || 130 (data->hkey_size && 131 nla_put(skb, ETHTOOL_A_RSS_HKEY, data->hkey_size, data->hkey))) 132 return -EMSGSIZE; 133 134 return 0; 135 } 136 137 static void rss_cleanup_data(struct ethnl_reply_data *reply_base) 138 { 139 const struct rss_reply_data *data = RSS_REPDATA(reply_base); 140 141 kfree(data->indir_table); 142 } 143 144 const struct ethnl_request_ops ethnl_rss_request_ops = { 145 .request_cmd = ETHTOOL_MSG_RSS_GET, 146 .reply_cmd = ETHTOOL_MSG_RSS_GET_REPLY, 147 .hdr_attr = ETHTOOL_A_RSS_HEADER, 148 .req_info_size = sizeof(struct rss_req_info), 149 .reply_data_size = sizeof(struct rss_reply_data), 150 151 .parse_request = rss_parse_request, 152 .prepare_data = rss_prepare_data, 153 .reply_size = rss_reply_size, 154 .fill_reply = rss_fill_reply, 155 .cleanup_data = rss_cleanup_data, 156 }; 157