ethtool: rss: echo the context number back
The response to a GET request in Netlink should fully identify
the queried object. RSS_GET accepts context id as an input,
so it must echo that attribute back to the response.
After (assuming context 1 has been created):
$ ./cli.py --spec netlink/specs/ethtool.yaml \
--do rss-get \
--json '{"header": {"dev-index": 2}, "context": 1}'
{'context': 1,
'header': {'dev-index': 2, 'dev-name': 'eth0'},
[...]
Fixes: 7112a04664bf ("ethtool: add netlink based get rss support")
Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Joe Damato <jdamato@fastly.com>
Link: https://patch.msgid.link/20240724234249.2621109-3-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
diff --git a/Documentation/netlink/specs/ethtool.yaml b/Documentation/netlink/specs/ethtool.yaml
index ebbd8dd..ea21fe1 100644
--- a/Documentation/netlink/specs/ethtool.yaml
+++ b/Documentation/netlink/specs/ethtool.yaml
@@ -1757,6 +1757,7 @@
reply:
attributes:
- header
+ - context
- hfunc
- indir
- hkey
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index 3ab423b..d5f246a 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -1875,6 +1875,7 @@
===================================== ====== ==========================
``ETHTOOL_A_RSS_HEADER`` nested reply header
+ ``ETHTOOL_A_RSS_CONTEXT`` u32 context number
``ETHTOOL_A_RSS_HFUNC`` u32 RSS hash func
``ETHTOOL_A_RSS_INDIR`` binary Indir table bytes
``ETHTOOL_A_RSS_HKEY`` binary Hash key bytes
diff --git a/net/ethtool/rss.c b/net/ethtool/rss.c
index 7167913..5c4c4505a 100644
--- a/net/ethtool/rss.c
+++ b/net/ethtool/rss.c
@@ -111,7 +111,8 @@ rss_reply_size(const struct ethnl_req_info *req_base,
const struct rss_reply_data *data = RSS_REPDATA(reply_base);
int len;
- len = nla_total_size(sizeof(u32)) + /* _RSS_HFUNC */
+ len = nla_total_size(sizeof(u32)) + /* _RSS_CONTEXT */
+ nla_total_size(sizeof(u32)) + /* _RSS_HFUNC */
nla_total_size(sizeof(u32)) + /* _RSS_INPUT_XFRM */
nla_total_size(sizeof(u32) * data->indir_size) + /* _RSS_INDIR */
nla_total_size(data->hkey_size); /* _RSS_HKEY */
@@ -124,6 +125,11 @@ rss_fill_reply(struct sk_buff *skb, const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
{
const struct rss_reply_data *data = RSS_REPDATA(reply_base);
+ struct rss_req_info *request = RSS_REQINFO(req_base);
+
+ if (request->rss_context &&
+ nla_put_u32(skb, ETHTOOL_A_RSS_CONTEXT, request->rss_context))
+ return -EMSGSIZE;
if ((data->hfunc &&
nla_put_u32(skb, ETHTOOL_A_RSS_HFUNC, data->hfunc)) ||
