Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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, 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;
100out_ops:
101 ethnl_ops_complete(dev);
102 return ret;
103}
104
105static int
106rss_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
119static int
120rss_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
137static 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
144const 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};