ethtool: rss: don't report key if device doesn't support it

JIRA: https://issues.redhat.com/browse/RHEL-57751

commit ec6e57beaf8bc64ea0c2dc0cc360afcc7f504425
Author: Jakub Kicinski <kuba@kernel.org>
Date:   Fri Aug 9 22:37:22 2024 -0700

    ethtool: rss: don't report key if device doesn't support it

    marvell/otx2 and mvpp2 do not support setting different
    keys for different RSS contexts. Contexts have separate
    indirection tables but key is shared with all other contexts.
    This is likely fine, indirection table is the most important
    piece.

    Don't report the key-related parameters from such drivers.
    This prevents driver-errors, e.g. otx2 always writes
    the main key, even when user asks to change per-context key.
    The second reason is that without this change tracking
    the keys by the core gets complicated. Even if the driver
    correctly reject setting key with rss_context != 0,
    change of the main key would have to be reflected in
    the XArray for all additional contexts.

    Since the additional contexts don't have their own keys
    not including the attributes (in Netlink speak) seems
    intuitive. ethtool CLI seems to deal with it just fine.

    Having to set the flag in majority of the drivers is
    a bit tedious but not reporting the key is a safer
    default.

    Reviewed-by: Edward Cree <ecree.xilinx@gmail.com>
    Reviewed-by: Joe Damato <jdamato@fastly.com>
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>
    Signed-off-by: David S. Miller <davem@davemloft.net>

Conflicts:
	drivers/net/ethernet/sfc/ef100_ethtool.c
	drivers/net/ethernet/sfc/ethtool.c
	- Because commit a9ee8d4a97d8 ("sfc: use new rxfh_context API")
          has not been backported yet.
Signed-off-by: Michal Schmidt <mschmidt@redhat.com>

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -5285,6 +5285,7 @@ void bnxt_ethtool_free(struct bnxt *bp)
 
 const struct ethtool_ops bnxt_ethtool_ops = {
 	.cap_link_lanes_supported	= 1,
+	.rxfh_per_ctx_key		= 1,
 	.rxfh_max_num_contexts		= BNXT_MAX_ETH_RSS_CTX + 1,
 	.rxfh_indir_space		= BNXT_MAX_RSS_TABLE_ENTRIES_P5,
 	.rxfh_priv_size			= sizeof(struct bnxt_rss_ctx),

drivers/net/ethernet/intel/ice/ice_ethtool.c

@@ -4206,6 +4206,7 @@ static const struct ethtool_ops ice_ethtool_ops = {
 				     ETHTOOL_COALESCE_USE_ADAPTIVE |
 				     ETHTOOL_COALESCE_RX_USECS_HIGH,
 	.cap_rss_sym_xor_supported = true,
+	.rxfh_per_ctx_key	= true,
 	.get_link_ksettings	= ice_get_link_ksettings,
 	.set_link_ksettings	= ice_set_link_ksettings,
 	.get_drvinfo		= ice_get_drvinfo,

drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c

@@ -2424,6 +2424,7 @@ static void mlx5e_get_rmon_stats(struct net_device *netdev,
 
 const struct ethtool_ops mlx5e_ethtool_ops = {
 	.cap_rss_ctx_supported	= true,
+	.rxfh_per_ctx_key	= true,
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_MAX_FRAMES |
 				     ETHTOOL_COALESCE_USE_ADAPTIVE |

drivers/net/ethernet/sfc/ef100_ethtool.c

@@ -59,6 +59,7 @@ const struct ethtool_ops ef100_ethtool_ops = {
 
 	.get_rxfh_indir_size	= efx_ethtool_get_rxfh_indir_size,
 	.get_rxfh_key_size	= efx_ethtool_get_rxfh_key_size,
+	.rxfh_per_ctx_key	= true,
 	.get_rxfh		= efx_ethtool_get_rxfh,
 	.set_rxfh		= efx_ethtool_set_rxfh,
 

drivers/net/ethernet/sfc/ethtool.c

@@ -268,6 +268,7 @@ const struct ethtool_ops efx_ethtool_ops = {
 	.set_rxnfc		= efx_ethtool_set_rxnfc,
 	.get_rxfh_indir_size	= efx_ethtool_get_rxfh_indir_size,
 	.get_rxfh_key_size	= efx_ethtool_get_rxfh_key_size,
+	.rxfh_per_ctx_key	= true,
 	.get_rxfh		= efx_ethtool_get_rxfh,
 	.set_rxfh		= efx_ethtool_set_rxfh,
 	.get_ts_info		= efx_ethtool_get_ts_info,

include/linux/ethtool.h

@@ -733,6 +733,9 @@ struct kernel_ethtool_ts_info {
  *	do not have to set this bit.
  * @cap_rss_sym_xor_supported: indicates if the driver supports symmetric-xor
  *	RSS.
+ * @rxfh_per_ctx_key: device supports setting different RSS key for each
+ *	additional context. Netlink API should report hfunc, key, and input_xfrm
+ *	for every context, not just context 0.
  * @rxfh_indir_space: max size of RSS indirection tables, if indirection table
  *	size as returned by @get_rxfh_indir_size may change during lifetime
  *	of the device. Leave as 0 if the table size is constant.
@@ -954,6 +957,7 @@ struct ethtool_ops {
 	u32     cap_link_lanes_supported:1;
 	u32     cap_rss_ctx_supported:1;
 	u32	cap_rss_sym_xor_supported:1;
+	u32	rxfh_per_ctx_key:1;
 	u32	rxfh_indir_space;
 	u16	rxfh_key_space;
 	u16	rxfh_priv_size;

net/ethtool/ioctl.c

@@ -1264,10 +1264,15 @@ static noinline_for_stack int ethtool_get_rxfh(struct net_device *dev,
 		if (rxfh_dev.indir)
 			memcpy(rxfh_dev.indir, ethtool_rxfh_context_indir(ctx),
 			       indir_bytes);
-		if (rxfh_dev.key)
-			memcpy(rxfh_dev.key, ethtool_rxfh_context_key(ctx),
-			       user_key_size);
-		rxfh_dev.hfunc = ctx->hfunc;
+		if (!ops->rxfh_per_ctx_key) {
+			rxfh_dev.key_size = 0;
+		} else {
+			if (rxfh_dev.key)
+				memcpy(rxfh_dev.key,
+				       ethtool_rxfh_context_key(ctx),
+				       user_key_size);
+			rxfh_dev.hfunc = ctx->hfunc;
+		}
 		rxfh_dev.input_xfrm = ctx->input_xfrm;
 		ret = 0;
 	} else {
@@ -1284,6 +1289,11 @@ static noinline_for_stack int ethtool_get_rxfh(struct net_device *dev,
 				&rxfh_dev.input_xfrm,
 				sizeof(rxfh.input_xfrm))) {
 		ret = -EFAULT;
+	} else if (copy_to_user(useraddr +
+				offsetof(struct ethtool_rxfh, key_size),
+				&rxfh_dev.key_size,
+				sizeof(rxfh.key_size))) {
+		ret = -EFAULT;
 	} else if (copy_to_user(useraddr +
 			      offsetof(struct ethtool_rxfh, rss_config[0]),
 			      rss_config, total_size)) {
@@ -1392,6 +1402,13 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
 
 	indir_bytes = dev_indir_size * sizeof(rxfh_dev.indir[0]);
 
+	/* Check settings which may be global rather than per RSS-context */
+	if (rxfh.rss_context && !ops->rxfh_per_ctx_key)
+		if (rxfh.key_size ||
+		    (rxfh.hfunc && rxfh.hfunc != ETH_RSS_HASH_NO_CHANGE) ||
+		    (rxfh.input_xfrm && rxfh.input_xfrm != RXH_XFRM_NO_CHANGE))
+			return -EOPNOTSUPP;
+
 	rss_config = kzalloc(indir_bytes + dev_key_size, GFP_USER);
 	if (!rss_config)
 		return -ENOMEM;

net/ethtool/rss.c

@@ -10,6 +10,7 @@ struct rss_req_info {
 
 struct rss_reply_data {
 	struct ethnl_reply_data		base;
+	bool				no_key_fields;
 	u32				indir_size;
 	u32				hkey_size;
 	u32				hfunc;
@@ -60,9 +61,12 @@ rss_prepare_data(const struct ethnl_req_info *req_base,
 		return -EOPNOTSUPP;
 
 	/* Some drivers don't handle rss_context */
-	if (request->rss_context && !(ops->cap_rss_ctx_supported ||
-				      ops->create_rxfh_context))
-		return -EOPNOTSUPP;
+	if (request->rss_context) {
+		if (!ops->cap_rss_ctx_supported && !ops->create_rxfh_context)
+			return -EOPNOTSUPP;
+
+		data->no_key_fields = !ops->rxfh_per_ctx_key;
+	}
 
 	ret = ethnl_ops_begin(dev);
 	if (ret < 0)
@@ -132,13 +136,18 @@ rss_fill_reply(struct sk_buff *skb, const struct ethnl_req_info *req_base,
 	    nla_put_u32(skb, ETHTOOL_A_RSS_CONTEXT, request->rss_context))
 		return -EMSGSIZE;
 
+	if ((data->indir_size &&
+	     nla_put(skb, ETHTOOL_A_RSS_INDIR,
+		     sizeof(u32) * data->indir_size, data->indir_table)))
+		return -EMSGSIZE;
+
+	if (data->no_key_fields)
+		return 0;
+
 	if ((data->hfunc &&
 	     nla_put_u32(skb, ETHTOOL_A_RSS_HFUNC, data->hfunc)) ||
 	    (data->input_xfrm &&
 	     nla_put_u32(skb, ETHTOOL_A_RSS_INPUT_XFRM, data->input_xfrm)) ||
-	    (data->indir_size &&
-	     nla_put(skb, ETHTOOL_A_RSS_INDIR,
-		     sizeof(u32) * data->indir_size, data->indir_table)) ||
 	    (data->hkey_size &&
 	     nla_put(skb, ETHTOOL_A_RSS_HKEY, data->hkey_size, data->hkey)))
 		return -EMSGSIZE;