158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include "netlink.h"
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#include "common.h"
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struct rss_req_info {
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struct ethnl_req_info base;
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u32 rss_context;
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};
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struct rss_reply_data {
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struct ethnl_reply_data base;
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u32 indir_size;
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u32 hkey_size;
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u32 hfunc;
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u32 *indir_table;
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u8 *hkey;
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};
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#define RSS_REQINFO(__req_base) \
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container_of(__req_base, struct rss_req_info, base)
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#define RSS_REPDATA(__reply_base) \
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container_of(__reply_base, struct rss_reply_data, base)
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const struct nla_policy ethnl_rss_get_policy[] = {
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[ETHTOOL_A_RSS_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
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[ETHTOOL_A_RSS_CONTEXT] = { .type = NLA_U32 },
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};
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static int
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rss_parse_request(struct ethnl_req_info *req_info, struct nlattr **tb,
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struct netlink_ext_ack *extack)
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{
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struct rss_req_info *request = RSS_REQINFO(req_info);
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if (tb[ETHTOOL_A_RSS_CONTEXT])
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request->rss_context = nla_get_u32(tb[ETHTOOL_A_RSS_CONTEXT]);
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return 0;
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}
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static int
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rss_prepare_data(const struct ethnl_req_info *req_base,
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struct ethnl_reply_data *reply_base,
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const struct genl_info *info)
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{
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struct rss_reply_data *data = RSS_REPDATA(reply_base);
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struct rss_req_info *request = RSS_REQINFO(req_base);
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struct net_device *dev = reply_base->dev;
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const struct ethtool_ops *ops;
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u32 total_size, indir_bytes;
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u8 dev_hfunc = 0;
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u8 *rss_config;
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int ret;
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ops = dev->ethtool_ops;
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if (!ops->get_rxfh)
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return -EOPNOTSUPP;
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/* Some drivers don't handle rss_context */
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if (request->rss_context && !ops->get_rxfh_context)
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return -EOPNOTSUPP;
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ret = ethnl_ops_begin(dev);
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if (ret < 0)
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return ret;
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data->indir_size = 0;
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data->hkey_size = 0;
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if (ops->get_rxfh_indir_size)
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data->indir_size = ops->get_rxfh_indir_size(dev);
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if (ops->get_rxfh_key_size)
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data->hkey_size = ops->get_rxfh_key_size(dev);
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indir_bytes = data->indir_size * sizeof(u32);
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total_size = indir_bytes + data->hkey_size;
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rss_config = kzalloc(total_size, GFP_KERNEL);
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if (!rss_config) {
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ret = -ENOMEM;
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goto out_ops;
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}
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if (data->indir_size)
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data->indir_table = (u32 *)rss_config;
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if (data->hkey_size)
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data->hkey = rss_config + indir_bytes;
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if (request->rss_context)
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ret = ops->get_rxfh_context(dev, data->indir_table, data->hkey,
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&dev_hfunc, request->rss_context);
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else
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ret = ops->get_rxfh(dev, data->indir_table, data->hkey,
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&dev_hfunc);
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if (ret)
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goto out_ops;
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data->hfunc = dev_hfunc;
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out_ops:
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ethnl_ops_complete(dev);
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return ret;
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}
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static int
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rss_reply_size(const struct ethnl_req_info *req_base,
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const struct ethnl_reply_data *reply_base)
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{
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const struct rss_reply_data *data = RSS_REPDATA(reply_base);
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int len;
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len = nla_total_size(sizeof(u32)) + /* _RSS_HFUNC */
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nla_total_size(sizeof(u32) * data->indir_size) + /* _RSS_INDIR */
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nla_total_size(data->hkey_size); /* _RSS_HKEY */
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return len;
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}
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static int
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rss_fill_reply(struct sk_buff *skb, const struct ethnl_req_info *req_base,
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const struct ethnl_reply_data *reply_base)
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{
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const struct rss_reply_data *data = RSS_REPDATA(reply_base);
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if ((data->hfunc &&
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nla_put_u32(skb, ETHTOOL_A_RSS_HFUNC, data->hfunc)) ||
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(data->indir_size &&
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nla_put(skb, ETHTOOL_A_RSS_INDIR,
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sizeof(u32) * data->indir_size, data->indir_table)) ||
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(data->hkey_size &&
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nla_put(skb, ETHTOOL_A_RSS_HKEY, data->hkey_size, data->hkey)))
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return -EMSGSIZE;
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return 0;
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}
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static void rss_cleanup_data(struct ethnl_reply_data *reply_base)
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{
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const struct rss_reply_data *data = RSS_REPDATA(reply_base);
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kfree(data->indir_table);
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}
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const struct ethnl_request_ops ethnl_rss_request_ops = {
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.request_cmd = ETHTOOL_MSG_RSS_GET,
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.reply_cmd = ETHTOOL_MSG_RSS_GET_REPLY,
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.hdr_attr = ETHTOOL_A_RSS_HEADER,
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.req_info_size = sizeof(struct rss_req_info),
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.reply_data_size = sizeof(struct rss_reply_data),
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.parse_request = rss_parse_request,
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.prepare_data = rss_prepare_data,
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.reply_size = rss_reply_size,
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.fill_reply = rss_fill_reply,
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.cleanup_data = rss_cleanup_data,
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};
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