Merge branch 'ethtool-rss-small-fixes-to-spec-and-get'

Jakub Kicinski says:

====================
ethtool: rss: small fixes to spec and GET

Two small fixes to the ethtool RSS_GET over Netlink.
Spec is a bit inaccurate and responses miss an identifier.
====================

Link: https://patch.msgid.link/20240724234249.2621109-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: kuba-moo

Documentation/netlink/specs/ethtool.yaml

@@ -1753,6 +1753,7 @@ operations:
         request:
           attributes:
             - header
+            - context
         reply:
           attributes:
             - header
@@ -1761,7 +1762,6 @@ operations:
             - indir
             - hkey
             - input_xfrm
-      dump: *rss-get-op
     -
       name: plca-get-cfg
       doc: Get PLCA params.

Documentation/networking/ethtool-netlink.rst

@@ -1875,6 +1875,7 @@ Kernel response contents:
 
 =====================================  ======  ==========================
   ``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

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)) ||