diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index bede24ef44fd5e70047d8469acbdd37884c5ac42..f10f8eb44255ba9a16c1850b1bc0eaff4c250c76 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -222,6 +222,7 @@ Userspace to kernel:
``ETHTOOL_MSG_MODULE_GET`` get transceiver module parameters
``ETHTOOL_MSG_PSE_SET`` set PSE parameters
``ETHTOOL_MSG_PSE_GET`` get PSE parameters
+ ``ETHTOOL_MSG_RSS_GET`` get RSS settings
===================================== =================================
Kernel to userspace:
@@ -263,6 +264,7 @@ Kernel to userspace:
``ETHTOOL_MSG_PHC_VCLOCKS_GET_REPLY`` PHC virtual clocks info
``ETHTOOL_MSG_MODULE_GET_REPLY`` transceiver module parameters
``ETHTOOL_MSG_PSE_GET_REPLY`` PSE parameters
+ ``ETHTOOL_MSG_RSS_GET_REPLY`` RSS settings
======================================== =================================
``GET`` requests are sent by userspace applications to retrieve device
@@ -1687,6 +1689,33 @@ to control PoDL PSE Admin functions. This option is implementing
``IEEE 802.3-2018`` 30.15.1.2.1 acPoDLPSEAdminControl. See
``ETHTOOL_A_PODL_PSE_ADMIN_STATE`` for supported values.
+RSS_GET
+=======
+
+Get indirection table, hash key and hash function info associated with a
+RSS context of an interface similar to ``ETHTOOL_GRSSH`` ioctl request.
+
+Request contents:
+
+===================================== ====== ==========================
+ ``ETHTOOL_A_RSS_HEADER`` nested request header
+ ``ETHTOOL_A_RSS_CONTEXT`` u32 context number
+===================================== ====== ==========================
+
+Kernel response contents:
+
+===================================== ====== ==========================
+ ``ETHTOOL_A_RSS_HEADER`` nested reply header
+ ``ETHTOOL_A_RSS_HFUNC`` u32 RSS hash func
+ ``ETHTOOL_A_RSS_INDIR`` binary Indir table bytes
+ ``ETHTOOL_A_RSS_HKEY`` binary Hash key bytes
+===================================== ====== ==========================
+
+ETHTOOL_A_RSS_HFUNC attribute is bitmap indicating the hash function
+being used. Current supported options are toeplitz, xor or crc32.
+ETHTOOL_A_RSS_INDIR attribute returns RSS indrection table where each byte
+indicates queue number.
+
Request translation
===================
@@ -1768,7 +1797,7 @@ are netlink only.
``ETHTOOL_GMODULEEEPROM`` ``ETHTOOL_MSG_MODULE_EEPROM_GET``
``ETHTOOL_GEEE`` ``ETHTOOL_MSG_EEE_GET``
``ETHTOOL_SEEE`` ``ETHTOOL_MSG_EEE_SET``
- ``ETHTOOL_GRSSH`` n/a
+ ``ETHTOOL_GRSSH`` ``ETHTOOL_MSG_RSS_GET``
``ETHTOOL_SRSSH`` n/a
``ETHTOOL_GTUNABLE`` n/a
``ETHTOOL_STUNABLE`` n/a
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index aaf7c6963d6193954a0dffc8a8397af895fb0939..5799a9db034eab8bc7f0dffc893b752dbce7e3ed 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -51,6 +51,7 @@ enum {
ETHTOOL_MSG_MODULE_SET,
ETHTOOL_MSG_PSE_GET,
ETHTOOL_MSG_PSE_SET,
+ ETHTOOL_MSG_RSS_GET,
/* add new constants above here */
__ETHTOOL_MSG_USER_CNT,
@@ -97,6 +98,7 @@ enum {
ETHTOOL_MSG_MODULE_GET_REPLY,
ETHTOOL_MSG_MODULE_NTF,
ETHTOOL_MSG_PSE_GET_REPLY,
+ ETHTOOL_MSG_RSS_GET_REPLY,
/* add new constants above here */
__ETHTOOL_MSG_KERNEL_CNT,
@@ -880,6 +882,18 @@ enum {
ETHTOOL_A_PSE_MAX = (__ETHTOOL_A_PSE_CNT - 1)
};
+enum {
+ ETHTOOL_A_RSS_UNSPEC,
+ ETHTOOL_A_RSS_HEADER,
+ ETHTOOL_A_RSS_CONTEXT, /* u32 */
+ ETHTOOL_A_RSS_HFUNC, /* u32 */
+ ETHTOOL_A_RSS_INDIR, /* binary */
+ ETHTOOL_A_RSS_HKEY, /* binary */
+
+ __ETHTOOL_A_RSS_CNT,
+ ETHTOOL_A_RSS_MAX = (__ETHTOOL_A_RSS_CNT - 1),
+};
+
/* generic netlink info */
#define ETHTOOL_GENL_NAME "ethtool"
#define ETHTOOL_GENL_VERSION 1
diff --git a/net/ethtool/Makefile b/net/ethtool/Makefile
index 72ab0944262af4fe880d180898c511e893827aee..228f13df2e18e45e6fb3d118fd62f2b485285bf2 100644
--- a/net/ethtool/Makefile
+++ b/net/ethtool/Makefile
@@ -4,7 +4,7 @@ obj-y += ioctl.o common.o
obj-$(CONFIG_ETHTOOL_NETLINK) += ethtool_nl.o
-ethtool_nl-y := netlink.o bitset.o strset.o linkinfo.o linkmodes.o \
+ethtool_nl-y := netlink.o bitset.o strset.o linkinfo.o linkmodes.o rss.o \
linkstate.o debug.o wol.o features.o privflags.o rings.o \
channels.o coalesce.o pause.o eee.o tsinfo.o cabletest.o \
tunnels.o fec.o eeprom.o stats.o phc_vclocks.o module.o \
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 1a4c11356c96cdadfff40754d9c01ca72774ccde..aee98be6237f7c083ab630e3b84234433b1a1724 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -287,6 +287,7 @@ ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
[ETHTOOL_MSG_PHC_VCLOCKS_GET] = ðnl_phc_vclocks_request_ops,
[ETHTOOL_MSG_MODULE_GET] = ðnl_module_request_ops,
[ETHTOOL_MSG_PSE_GET] = ðnl_pse_request_ops,
+ [ETHTOOL_MSG_RSS_GET] = ðnl_rss_request_ops,
};
static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
@@ -1040,6 +1041,12 @@ static const struct genl_ops ethtool_genl_ops[] = {
.policy = ethnl_pse_set_policy,
.maxattr = ARRAY_SIZE(ethnl_pse_set_policy) - 1,
},
+ {
+ .cmd = ETHTOOL_MSG_RSS_GET,
+ .doit = ethnl_default_doit,
+ .policy = ethnl_rss_get_policy,
+ .maxattr = ARRAY_SIZE(ethnl_rss_get_policy) - 1,
+ },
};
static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index 1bfd374f97188bfbe58c8cbfb9a26a2cd9b7410f..3753787ba233bba0af08ce4299cb236876abcfe2 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -346,6 +346,7 @@ extern const struct ethnl_request_ops ethnl_stats_request_ops;
extern const struct ethnl_request_ops ethnl_phc_vclocks_request_ops;
extern const struct ethnl_request_ops ethnl_module_request_ops;
extern const struct ethnl_request_ops ethnl_pse_request_ops;
+extern const struct ethnl_request_ops ethnl_rss_request_ops;
extern const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_FLAGS + 1];
extern const struct nla_policy ethnl_header_policy_stats[ETHTOOL_A_HEADER_FLAGS + 1];
@@ -386,6 +387,7 @@ extern const struct nla_policy ethnl_module_get_policy[ETHTOOL_A_MODULE_HEADER +
extern const struct nla_policy ethnl_module_set_policy[ETHTOOL_A_MODULE_POWER_MODE_POLICY + 1];
extern const struct nla_policy ethnl_pse_get_policy[ETHTOOL_A_PSE_HEADER + 1];
extern const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1];
+extern const struct nla_policy ethnl_rss_get_policy[ETHTOOL_A_RSS_CONTEXT + 1];
int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info);
int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info);
diff --git a/net/ethtool/rss.c b/net/ethtool/rss.c
new file mode 100644
index 0000000000000000000000000000000000000000..ebe6145aed3f1a79d30d17cb221c55cdcee9134a
--- /dev/null
+++ b/net/ethtool/rss.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "netlink.h"
+#include "common.h"
+
+struct rss_req_info {
+ struct ethnl_req_info base;
+ u32 rss_context;
+};
+
+struct rss_reply_data {
+ struct ethnl_reply_data base;
+ u32 indir_size;
+ u32 hkey_size;
+ u32 hfunc;
+ u32 *indir_table;
+ u8 *hkey;
+};
+
+#define RSS_REQINFO(__req_base) \
+ container_of(__req_base, struct rss_req_info, base)
+
+#define RSS_REPDATA(__reply_base) \
+ container_of(__reply_base, struct rss_reply_data, base)
+
+const struct nla_policy ethnl_rss_get_policy[] = {
+ [ETHTOOL_A_RSS_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
+ [ETHTOOL_A_RSS_CONTEXT] = { .type = NLA_U32 },
+};
+
+static int
+rss_parse_request(struct ethnl_req_info *req_info, struct nlattr **tb,
+ struct netlink_ext_ack *extack)
+{
+ struct rss_req_info *request = RSS_REQINFO(req_info);
+
+ if (tb[ETHTOOL_A_RSS_CONTEXT])
+ request->rss_context = nla_get_u32(tb[ETHTOOL_A_RSS_CONTEXT]);
+
+ return 0;
+}
+
+static int
+rss_prepare_data(const struct ethnl_req_info *req_base,
+ struct ethnl_reply_data *reply_base, struct genl_info *info)
+{
+ struct rss_reply_data *data = RSS_REPDATA(reply_base);
+ struct rss_req_info *request = RSS_REQINFO(req_base);
+ struct net_device *dev = reply_base->dev;
+ const struct ethtool_ops *ops;
+ u32 total_size, indir_bytes;
+ u8 dev_hfunc = 0;
+ u8 *rss_config;
+ int ret;
+
+ ops = dev->ethtool_ops;
+ if (!ops->get_rxfh)
+ return -EOPNOTSUPP;
+
+ /* Some drivers don't handle rss_context */
+ if (request->rss_context && !ops->get_rxfh_context)
+ return -EOPNOTSUPP;
+
+ ret = ethnl_ops_begin(dev);
+ if (ret < 0)
+ return ret;
+
+ data->indir_size = 0;
+ data->hkey_size = 0;
+ if (ops->get_rxfh_indir_size)
+ data->indir_size = ops->get_rxfh_indir_size(dev);
+ if (ops->get_rxfh_key_size)
+ data->hkey_size = ops->get_rxfh_key_size(dev);
+
+ indir_bytes = data->indir_size * sizeof(u32);
+ total_size = indir_bytes + data->hkey_size;
+ rss_config = kzalloc(total_size, GFP_KERNEL);
+ if (!rss_config) {
+ ret = -ENOMEM;
+ goto out_ops;
+ }
+
+ if (data->indir_size)
+ data->indir_table = (u32 *)rss_config;
+
+ if (data->hkey_size)
+ data->hkey = rss_config + indir_bytes;
+
+ if (request->rss_context)
+ ret = ops->get_rxfh_context(dev, data->indir_table, data->hkey,
+ &dev_hfunc, request->rss_context);
+ else
+ ret = ops->get_rxfh(dev, data->indir_table, data->hkey,
+ &dev_hfunc);
+
+ if (ret)
+ goto out_ops;
+
+ data->hfunc = dev_hfunc;
+out_ops:
+ ethnl_ops_complete(dev);
+ return ret;
+}
+
+static int
+rss_reply_size(const struct ethnl_req_info *req_base,
+ const struct ethnl_reply_data *reply_base)
+{
+ const struct rss_reply_data *data = RSS_REPDATA(reply_base);
+ int len;
+
+ len = nla_total_size(sizeof(u32)) + /* _RSS_HFUNC */
+ nla_total_size(sizeof(u32) * data->indir_size) + /* _RSS_INDIR */
+ nla_total_size(data->hkey_size); /* _RSS_HKEY */
+
+ return len;
+}
+
+static int
+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);
+
+ if (nla_put_u32(skb, ETHTOOL_A_RSS_HFUNC, data->hfunc) ||
+ nla_put(skb, ETHTOOL_A_RSS_INDIR,
+ sizeof(u32) * data->indir_size, data->indir_table) ||
+ nla_put(skb, ETHTOOL_A_RSS_HKEY, data->hkey_size, data->hkey))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+static void rss_cleanup_data(struct ethnl_reply_data *reply_base)
+{
+ const struct rss_reply_data *data = RSS_REPDATA(reply_base);
+
+ kfree(data->indir_table);
+}
+
+const struct ethnl_request_ops ethnl_rss_request_ops = {
+ .request_cmd = ETHTOOL_MSG_RSS_GET,
+ .reply_cmd = ETHTOOL_MSG_RSS_GET_REPLY,
+ .hdr_attr = ETHTOOL_A_RSS_HEADER,
+ .req_info_size = sizeof(struct rss_req_info),
+ .reply_data_size = sizeof(struct rss_reply_data),
+
+ .parse_request = rss_parse_request,
+ .prepare_data = rss_prepare_data,
+ .reply_size = rss_reply_size,
+ .fill_reply = rss_fill_reply,
+ .cleanup_data = rss_cleanup_data,
+};