1// SPDX-License-Identifier: GPL-2.0-only 2 3#include "netlink.h" 4#include "common.h" 5 6struct rss_req_info { 7 struct ethnl_req_info base; 8 u32 rss_context; 9}; 10 11struct 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 26const 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 31static int 32rss_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 43static int 44rss_prepare_data(const struct ethnl_req_info *req_base, 45 struct ethnl_reply_data *reply_base, 46 const struct genl_info *info) 47{ 48 struct rss_reply_data *data = RSS_REPDATA(reply_base); 49 struct rss_req_info *request = RSS_REQINFO(req_base); 50 struct net_device *dev = reply_base->dev; 51 const struct ethtool_ops *ops; 52 u32 total_size, indir_bytes; 53 u8 dev_hfunc = 0; 54 u8 *rss_config; 55 int ret; 56 57 ops = dev->ethtool_ops; 58 if (!ops->get_rxfh) 59 return -EOPNOTSUPP; 60 61 /* Some drivers don't handle rss_context */ 62 if (request->rss_context && !ops->get_rxfh_context) 63 return -EOPNOTSUPP; 64 65 ret = ethnl_ops_begin(dev); 66 if (ret < 0) 67 return ret; 68 69 data->indir_size = 0; 70 data->hkey_size = 0; 71 if (ops->get_rxfh_indir_size) 72 data->indir_size = ops->get_rxfh_indir_size(dev); 73 if (ops->get_rxfh_key_size) 74 data->hkey_size = ops->get_rxfh_key_size(dev); 75 76 indir_bytes = data->indir_size * sizeof(u32); 77 total_size = indir_bytes + data->hkey_size; 78 rss_config = kzalloc(total_size, GFP_KERNEL); 79 if (!rss_config) { 80 ret = -ENOMEM; 81 goto out_ops; 82 } 83 84 if (data->indir_size) 85 data->indir_table = (u32 *)rss_config; 86 87 if (data->hkey_size) 88 data->hkey = rss_config + indir_bytes; 89 90 if (request->rss_context) 91 ret = ops->get_rxfh_context(dev, data->indir_table, data->hkey, 92 &dev_hfunc, request->rss_context); 93 else 94 ret = ops->get_rxfh(dev, data->indir_table, data->hkey, 95 &dev_hfunc); 96 97 if (ret) 98 goto out_ops; 99 100 data->hfunc = dev_hfunc; 101out_ops: 102 ethnl_ops_complete(dev); 103 return ret; 104} 105 106static int 107rss_reply_size(const struct ethnl_req_info *req_base, 108 const struct ethnl_reply_data *reply_base) 109{ 110 const struct rss_reply_data *data = RSS_REPDATA(reply_base); 111 int len; 112 113 len = nla_total_size(sizeof(u32)) + /* _RSS_HFUNC */ 114 nla_total_size(sizeof(u32) * data->indir_size) + /* _RSS_INDIR */ 115 nla_total_size(data->hkey_size); /* _RSS_HKEY */ 116 117 return len; 118} 119 120static int 121rss_fill_reply(struct sk_buff *skb, const struct ethnl_req_info *req_base, 122 const struct ethnl_reply_data *reply_base) 123{ 124 const struct rss_reply_data *data = RSS_REPDATA(reply_base); 125 126 if ((data->hfunc && 127 nla_put_u32(skb, ETHTOOL_A_RSS_HFUNC, data->hfunc)) || 128 (data->indir_size && 129 nla_put(skb, ETHTOOL_A_RSS_INDIR, 130 sizeof(u32) * data->indir_size, data->indir_table)) || 131 (data->hkey_size && 132 nla_put(skb, ETHTOOL_A_RSS_HKEY, data->hkey_size, data->hkey))) 133 return -EMSGSIZE; 134 135 return 0; 136} 137 138static void rss_cleanup_data(struct ethnl_reply_data *reply_base) 139{ 140 const struct rss_reply_data *data = RSS_REPDATA(reply_base); 141 142 kfree(data->indir_table); 143} 144 145const struct ethnl_request_ops ethnl_rss_request_ops = { 146 .request_cmd = ETHTOOL_MSG_RSS_GET, 147 .reply_cmd = ETHTOOL_MSG_RSS_GET_REPLY, 148 .hdr_attr = ETHTOOL_A_RSS_HEADER, 149 .req_info_size = sizeof(struct rss_req_info), 150 .reply_data_size = sizeof(struct rss_reply_data), 151 152 .parse_request = rss_parse_request, 153 .prepare_data = rss_prepare_data, 154 .reply_size = rss_reply_size, 155 .fill_reply = rss_fill_reply, 156 .cleanup_data = rss_cleanup_data, 157}; 158