Message-Id: <1542298436-23422-5-git-send-email-claudiu.manoil@nxp.com>
Date:   Thu, 15 Nov 2018 18:13:56 +0200
From:   Claudiu Manoil <claudiu.manoil@....com>
To:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, alexandru.marginean@....com,
        catalin.horghidan@....com
Subject: [PATCH net-next 4/4] enetc: Add RFS and RSS support

A ternary match table is used for RFS. If multiple entries in the table
match, the entry with the lowest numerical values index is chosen as the
matching entry.  Entries in the table are identified using an index which
takes a value from 0 to PRFSCAPR[NUM_RFS]-1 when accessed by the PSI (PF).
Portions of the RFS table can be assigned to each SI by the PSI (PF)
driver in PSIaRFSCFGR.  Assignments are cumulative, the entries assigned
to SIn start after those assigned to SIn-1.  The total assignments to all
SIs must be equal to or less than the number available to the port as found
in PRFSCAPR.

For RSS, the Toeplitz hash function used requires two inputs, a 40B random
secret key that is supplied through the PRSSKR0-9 registers as well as the
relevant pieces of the packet header (n-tuple). The 6 LSB bits of the hash
function result will then be used as a pointer to obtain the tag referenced
in the 64 entry indirection table. The result will provide a winning group
which will be used to help route the received packet.

Signed-off-by: Alex Marginean <alexandru.marginean@....com>
Signed-off-by: Claudiu Manoil <claudiu.manoil@....com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c       |  77 ++++++
 drivers/net/ethernet/freescale/enetc/enetc.h       |  14 ++
 drivers/net/ethernet/freescale/enetc/enetc_cbdr.c  | 100 ++++++++
 .../net/ethernet/freescale/enetc/enetc_ethtool.c   | 277 ++++++++++++++++++++-
 drivers/net/ethernet/freescale/enetc/enetc_hw.h    |  43 ++++
 drivers/net/ethernet/freescale/enetc/enetc_pf.c    |  34 ++-
 drivers/net/ethernet/freescale/enetc/enetc_vf.c    |  10 +
 7 files changed, 552 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index f6a672cb..e27d0af 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -631,6 +631,7 @@ static void enetc_process_skb(struct enetc_bdr *rx_ring,
 }
 
 /* Probing and Init */
+#define ENETC_MAX_RFS_SIZE 64
 void enetc_get_si_caps(struct enetc_si *si)
 {
 	struct enetc_hw *hw = &si->hw;
@@ -640,6 +641,17 @@ void enetc_get_si_caps(struct enetc_si *si)
 	val = enetc_rd(hw, ENETC_SICAPR0);
 	si->num_rx_rings = (val >> 16) & 0xff;
 	si->num_tx_rings = val & 0xff;
+
+	val = enetc_rd(hw, ENETC_SIRFSCAPR);
+	si->num_fs_entries = ENETC_SIRFSCAPR_GET_NUM_RFS(val);
+	si->num_fs_entries = min(si->num_fs_entries, ENETC_MAX_RFS_SIZE);
+
+	si->num_rss = 0;
+	val = enetc_rd(hw, ENETC_SIPCAPR0);
+	if (val & ENETC_SIPCAPR0_RSS) {
+		val = enetc_rd(hw, ENETC_SIRSSCAPR);
+		si->num_rss = ENETC_SIRSSCAPR_GET_NUM_RSS(val);
+	}
 }
 
 static int enetc_dma_alloc_bdr(struct enetc_bdr *r, size_t bd_size)
@@ -891,10 +903,31 @@ static void enetc_clear_cbdr(struct enetc_hw *hw)
 	enetc_wr(hw, ENETC_SICBDRMR, 0);
 }
 
+static int enetc_setup_default_rss_table(struct enetc_si *si, int num_groups)
+{
+	int *rss_table;
+	int i;
+
+	rss_table = kmalloc_array(si->num_rss, sizeof(*rss_table), GFP_KERNEL);
+	if (!rss_table)
+		return -ENOMEM;
+
+	/* Set up RSS table defaults */
+	for (i = 0; i < si->num_rss; i++)
+		rss_table[i] = i % num_groups;
+
+	enetc_set_rss_table(si, rss_table, si->num_rss);
+
+	kfree(rss_table);
+
+	return 0;
+}
+
 static int enetc_configure_si(struct enetc_ndev_priv *priv)
 {
 	struct enetc_si *si = priv->si;
 	struct enetc_hw *hw = &si->hw;
+	int err;
 
 	enetc_setup_cbdr(hw, &si->cbd_ring);
 	/* set SI cache attributes */
@@ -904,6 +937,12 @@ static int enetc_configure_si(struct enetc_ndev_priv *priv)
 	/* enable SI */
 	enetc_wr(hw, ENETC_SIMR, ENETC_SIMR_EN);
 
+	if (si->num_rss) {
+		err = enetc_setup_default_rss_table(si, priv->num_rx_rings);
+		if (err)
+			return err;
+	}
+
 	return 0;
 }
 
@@ -936,6 +975,13 @@ int enetc_alloc_si_resources(struct enetc_ndev_priv *priv)
 	if (err)
 		return err;
 
+	priv->cls_rules = kcalloc(si->num_fs_entries, sizeof(*priv->cls_rules),
+				  GFP_KERNEL);
+	if (!priv->cls_rules) {
+		err = -ENOMEM;
+		goto err_alloc_cls;
+	}
+
 	err = enetc_configure_si(priv);
 	if (err)
 		goto err_config_si;
@@ -943,6 +989,8 @@ int enetc_alloc_si_resources(struct enetc_ndev_priv *priv)
 	return 0;
 
 err_config_si:
+	kfree(priv->cls_rules);
+err_alloc_cls:
 	enetc_clear_cbdr(&si->hw);
 	enetc_free_cbdr(priv->dev, &si->cbd_ring);
 
@@ -955,6 +1003,8 @@ void enetc_free_si_resources(struct enetc_ndev_priv *priv)
 
 	enetc_clear_cbdr(&si->hw);
 	enetc_free_cbdr(priv->dev, &si->cbd_ring);
+
+	kfree(priv->cls_rules);
 }
 
 static void enetc_setup_txbdr(struct enetc_hw *hw, struct enetc_bdr *tx_ring)
@@ -1298,6 +1348,33 @@ struct net_device_stats *enetc_get_stats(struct net_device *ndev)
 	return stats;
 }
 
+static int enetc_set_rss(struct net_device *ndev, int en)
+{
+	struct enetc_ndev_priv *priv = netdev_priv(ndev);
+	struct enetc_hw *hw = &priv->si->hw;
+	u32 reg;
+
+	enetc_wr(hw, ENETC_SIRBGCR, priv->num_rx_rings);
+
+	reg = enetc_rd(hw, ENETC_SIMR);
+	reg &= ~ENETC_SIMR_RSSE;
+	reg |= (en) ? ENETC_SIMR_RSSE : 0;
+	enetc_wr(hw, ENETC_SIMR, reg);
+
+	return 0;
+}
+
+int enetc_set_features(struct net_device *ndev,
+		       netdev_features_t features)
+{
+	netdev_features_t changed = ndev->features ^ features;
+
+	if (changed & NETIF_F_RXHASH)
+		enetc_set_rss(ndev, !!(features & NETIF_F_RXHASH));
+
+	return 0;
+}
+
 int enetc_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 {
 	return -EINVAL;
diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h
index 756737a..879715d 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc.h
@@ -127,6 +127,8 @@ struct enetc_si {
 
 	int num_rx_rings; /* how many rings are available in the SI */
 	int num_tx_rings;
+	int num_fs_entries;
+	int num_rss; /* number of RSS buckets */
 	unsigned short pad;
 };
 
@@ -156,6 +158,11 @@ struct enetc_int_vector {
 	struct enetc_bdr tx_ring[0];
 };
 
+struct enetc_cls_rule {
+	struct ethtool_rx_flow_spec fs;
+	int used;
+};
+
 #define ENETC_MAX_BDR_INT	2 /* fixed to max # of available cpus */
 
 struct enetc_ndev_priv {
@@ -173,6 +180,8 @@ struct enetc_ndev_priv {
 	struct enetc_bdr *tx_ring[16];
 	struct enetc_bdr *rx_ring[16];
 
+	struct enetc_cls_rule *cls_rules;
+
 	struct device_node *phy_node;
 	phy_interface_t if_mode;
 };
@@ -213,3 +222,8 @@ void enetc_set_ethtool_ops(struct net_device *ndev);
 int enetc_set_mac_flt_entry(struct enetc_si *si, int index,
 			    char *mac_addr, int si_map);
 int enetc_clear_mac_flt_entry(struct enetc_si *si, int index);
+int enetc_set_fs_entry(struct enetc_si *si, struct enetc_cmd_rfse *rfse,
+		       int index);
+void enetc_set_rss_key(struct enetc_hw *hw, const u8 *bytes);
+int enetc_get_rss_table(struct enetc_si *si, u32 *table, int count);
+int enetc_set_rss_table(struct enetc_si *si, const u32 *table, int count);
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_cbdr.c b/drivers/net/ethernet/freescale/enetc/enetc_cbdr.c
index 460481d..5acf96f 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_cbdr.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_cbdr.c
@@ -108,3 +108,103 @@ int enetc_set_mac_flt_entry(struct enetc_si *si, int index,
 
 	return enetc_send_cmd(si, &cbd);
 }
+
+#define RFSE_ALIGN	64
+/* Set entry in RFS table */
+int enetc_set_fs_entry(struct enetc_si *si, struct enetc_cmd_rfse *rfse,
+		       int index)
+{
+	struct enetc_cbd cbd = {.cmd = 0};
+	dma_addr_t dma, dma_align;
+	void *tmp, *tmp_align;
+	int err;
+
+	/* fill up the "set" descriptor */
+	cbd.cmd = 0;
+	cbd.cls = 4;
+	cbd.index = cpu_to_le16(index);
+	cbd.length = cpu_to_le16(sizeof(*rfse));
+	cbd.opt[3] = cpu_to_le32(0); /* SI */
+
+	tmp = dma_alloc_coherent(&si->pdev->dev, sizeof(*rfse) + RFSE_ALIGN,
+				 &dma, GFP_KERNEL);
+	if (!tmp) {
+		dev_err(&si->pdev->dev, "DMA mapping of RFS entry failed!\n");
+		return -ENOMEM;
+	}
+
+	dma_align = ALIGN(dma, RFSE_ALIGN);
+	tmp_align = PTR_ALIGN(tmp, RFSE_ALIGN);
+	memcpy(tmp_align, rfse, sizeof(*rfse));
+
+	cbd.addr[0] = cpu_to_le32(lower_32_bits(dma_align));
+	cbd.addr[1] = cpu_to_le32(upper_32_bits(dma_align));
+
+	err = enetc_send_cmd(si, &cbd);
+	if (err)
+		dev_err(&si->pdev->dev, "FS entry add failed (%d)!", err);
+
+	dma_free_coherent(&si->pdev->dev, sizeof(*rfse) + RFSE_ALIGN,
+			  tmp, dma);
+
+	return err;
+}
+
+#define RSSE_ALIGN	64
+static int enetc_cmd_rss_table(struct enetc_si *si, u32 *table, int count,
+			       bool read)
+{
+	struct enetc_cbd cbd = {.cmd = 0};
+	dma_addr_t dma, dma_align;
+	u8 *tmp, *tmp_align;
+	int err, i;
+
+	if (count < RSSE_ALIGN)
+		/* HW only takes in a full 64 entry table */
+		return -EINVAL;
+
+	tmp = dma_alloc_coherent(&si->pdev->dev, count + RSSE_ALIGN,
+				 &dma, GFP_KERNEL);
+	if (!tmp) {
+		dev_err(&si->pdev->dev, "DMA mapping of RSS table failed!\n");
+		return -ENOMEM;
+	}
+	dma_align = ALIGN(dma, RSSE_ALIGN);
+	tmp_align = PTR_ALIGN(tmp, RSSE_ALIGN);
+
+	if (!read)
+		for (i = 0; i < count; i++)
+			tmp_align[i] = (u8)(table[i]);
+
+	/* fill up the descriptor */
+	cbd.cmd = read ? 2 : 1;
+	cbd.cls = 3;
+	cbd.length = cpu_to_le16(count);
+
+	cbd.addr[0] = cpu_to_le32(lower_32_bits(dma_align));
+	cbd.addr[1] = cpu_to_le32(upper_32_bits(dma_align));
+
+	err = enetc_send_cmd(si, &cbd);
+	if (err)
+		dev_err(&si->pdev->dev, "RSS cmd failed (%d)!", err);
+
+	if (read)
+		for (i = 0; i < count; i++)
+			table[i] = tmp_align[i];
+
+	dma_free_coherent(&si->pdev->dev, count + RSSE_ALIGN, tmp, dma);
+
+	return err;
+}
+
+/* Get RSS table */
+int enetc_get_rss_table(struct enetc_si *si, u32 *table, int count)
+{
+	return enetc_cmd_rss_table(si, table, count, true);
+}
+
+/* Set RSS table */
+int enetc_set_rss_table(struct enetc_si *si, const u32 *table, int count)
+{
+	return enetc_cmd_rss_table(si, (u32 *)table, count, false);
+}
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
index f6f63dd..c8150ae 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
@@ -25,8 +25,8 @@ static const u32 enetc_rxbdr_regs[] = {
 static const u32 enetc_port_regs[] = {
 	ENETC_PMR, ENETC_PSR, ENETC_PSIPMR, ENETC_PSIPMAR0(0),
 	ENETC_PSIPMAR1(0), ENETC_PTXMBAR, ENETC_PCAPR0, ENETC_PCAPR1,
-	ENETC_PSICFGR0(0), ENETC_PTCMSDUR(0), ENETC_PM0_CMD_CFG,
-	ENETC_PM0_MAXFRM, ENETC_PM0_IF_MODE
+	ENETC_PSICFGR0(0), ENETC_PRFSCAPR, ENETC_PTCMSDUR(0),
+	ENETC_PM0_CMD_CFG, ENETC_PM0_MAXFRM, ENETC_PM0_IF_MODE
 };
 
 static int enetc_get_reglen(struct net_device *ndev)
@@ -268,6 +268,268 @@ static void enetc_get_ethtool_stats(struct net_device *ndev,
 		data[o++] = enetc_port_rd(hw, enetc_port_counters[i].reg);
 }
 
+#define ENETC_RSSHASH_L3 (RXH_L2DA | RXH_VLAN | RXH_L3_PROTO | RXH_IP_SRC | \
+			  RXH_IP_DST)
+#define ENETC_RSSHASH_L4 (ENETC_RSSHASH_L3 | RXH_L4_B_0_1 | RXH_L4_B_2_3)
+static int enetc_get_rsshash(struct ethtool_rxnfc *rxnfc)
+{
+	static const u32 rsshash[] = {
+			[TCP_V4_FLOW]    = ENETC_RSSHASH_L4,
+			[UDP_V4_FLOW]    = ENETC_RSSHASH_L4,
+			[SCTP_V4_FLOW]   = ENETC_RSSHASH_L4,
+			[AH_ESP_V4_FLOW] = ENETC_RSSHASH_L3,
+			[IPV4_FLOW]      = ENETC_RSSHASH_L3,
+			[TCP_V6_FLOW]    = ENETC_RSSHASH_L4,
+			[UDP_V6_FLOW]    = ENETC_RSSHASH_L4,
+			[SCTP_V6_FLOW]   = ENETC_RSSHASH_L4,
+			[AH_ESP_V6_FLOW] = ENETC_RSSHASH_L3,
+			[IPV6_FLOW]      = ENETC_RSSHASH_L3,
+			[ETHER_FLOW]     = 0,
+	};
+
+	if (rxnfc->flow_type >= ARRAY_SIZE(rsshash))
+		return -EINVAL;
+
+	rxnfc->data = rsshash[rxnfc->flow_type];
+
+	return 0;
+}
+
+/* current HW spec does byte reversal on everything including MAC addresses */
+static void ether_addr_copy_swap(u8 *dst, const u8 *src)
+{
+	int i;
+
+	for (i = 0; i < ETH_ALEN; i++)
+		dst[i] = src[ETH_ALEN - i - 1];
+}
+
+static int enetc_set_cls_entry(struct enetc_si *si,
+			       struct ethtool_rx_flow_spec *fs, bool en)
+{
+	struct ethtool_tcpip4_spec *l4ip4_h, *l4ip4_m;
+	struct ethtool_usrip4_spec *l3ip4_h, *l3ip4_m;
+	struct ethhdr *eth_h, *eth_m;
+	struct enetc_cmd_rfse rfse = { {0} };
+
+	if (!en)
+		goto done;
+
+	switch (fs->flow_type & 0xff) {
+	case TCP_V4_FLOW:
+		l4ip4_h = &fs->h_u.tcp_ip4_spec;
+		l4ip4_m = &fs->m_u.tcp_ip4_spec;
+		goto l4ip4;
+	case UDP_V4_FLOW:
+		l4ip4_h = &fs->h_u.udp_ip4_spec;
+		l4ip4_m = &fs->m_u.udp_ip4_spec;
+		goto l4ip4;
+	case SCTP_V4_FLOW:
+		l4ip4_h = &fs->h_u.sctp_ip4_spec;
+		l4ip4_m = &fs->m_u.sctp_ip4_spec;
+l4ip4:
+		rfse.sip_h[0] = ntohl(l4ip4_h->ip4src);
+		rfse.sip_m[0] = ntohl(l4ip4_m->ip4src);
+		rfse.dip_h[0] = ntohl(l4ip4_h->ip4dst);
+		rfse.dip_m[0] = ntohl(l4ip4_m->ip4dst);
+		rfse.sport_h = ntohs(l4ip4_h->psrc);
+		rfse.sport_m = ntohs(l4ip4_m->psrc);
+		rfse.dport_h = ntohs(l4ip4_h->pdst);
+		rfse.dport_m = ntohs(l4ip4_m->pdst);
+		if (l4ip4_m->tos)
+			netdev_warn(si->ndev, "ToS field is not supported and was ignored\n");
+		rfse.ethtype_h = ETH_P_IP; /* IPv4 */
+		rfse.ethtype_m = 0xffff;
+		break;
+	case IP_USER_FLOW:
+		l3ip4_h = &fs->h_u.usr_ip4_spec;
+		l3ip4_m = &fs->m_u.usr_ip4_spec;
+
+		rfse.sip_h[0] = ntohl(l3ip4_h->ip4src);
+		rfse.sip_m[0] = ntohl(l3ip4_m->ip4src);
+		rfse.dip_h[0] = ntohl(l3ip4_h->ip4dst);
+		rfse.dip_m[0] = ntohl(l3ip4_m->ip4dst);
+		if (l3ip4_m->tos)
+			netdev_warn(si->ndev, "ToS field is not supported and was ignored\n");
+		rfse.ethtype_h = ETH_P_IP; /* IPv4 */
+		rfse.ethtype_m = 0xffff;
+		break;
+	case ETHER_FLOW:
+		eth_h = &fs->h_u.ether_spec;
+		eth_m = &fs->m_u.ether_spec;
+
+		ether_addr_copy_swap(rfse.smac_h, eth_h->h_source);
+		ether_addr_copy_swap(rfse.smac_m, eth_m->h_source);
+		ether_addr_copy_swap(rfse.dmac_h, eth_h->h_dest);
+		ether_addr_copy_swap(rfse.dmac_m, eth_m->h_dest);
+		rfse.ethtype_h = ntohs(eth_h->h_proto);
+		rfse.ethtype_m = ntohs(eth_m->h_proto);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	rfse.mode |= ENETC_RFSE_EN;
+	if (fs->ring_cookie != RX_CLS_FLOW_DISC) {
+		rfse.mode |= ENETC_RFSE_MODE_BD;
+		rfse.result = fs->ring_cookie;
+	}
+done:
+	return enetc_set_fs_entry(si, &rfse, fs->location);
+}
+
+static int enetc_get_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *rxnfc,
+			   u32 *rule_locs)
+{
+	struct enetc_ndev_priv *priv = netdev_priv(ndev);
+	int i, j;
+
+	switch (rxnfc->cmd) {
+	case ETHTOOL_GRXRINGS:
+		rxnfc->data = priv->num_rx_rings;
+		break;
+	case ETHTOOL_GRXFH:
+		/* get RSS hash config */
+		return enetc_get_rsshash(rxnfc);
+	case ETHTOOL_GRXCLSRLCNT:
+		/* total number of entries */
+		rxnfc->data = priv->si->num_fs_entries;
+		/* number of entries in use */
+		rxnfc->rule_cnt = 0;
+		for (i = 0; i < priv->si->num_fs_entries; i++)
+			if (priv->cls_rules[i].used)
+				rxnfc->rule_cnt++;
+		break;
+	case ETHTOOL_GRXCLSRULE:
+		if (rxnfc->fs.location >= priv->si->num_fs_entries)
+			return -EINVAL;
+
+		/* get entry x */
+		rxnfc->fs = priv->cls_rules[rxnfc->fs.location].fs;
+		break;
+	case ETHTOOL_GRXCLSRLALL:
+		/* total number of entries */
+		rxnfc->data = priv->si->num_fs_entries;
+		/* array of indexes of used entries */
+		j = 0;
+		for (i = 0; i < priv->si->num_fs_entries; i++) {
+			if (!priv->cls_rules[i].used)
+				continue;
+			if (j == rxnfc->rule_cnt)
+				return -EMSGSIZE;
+			rule_locs[j++] = i;
+		}
+		/* number of entries in use */
+		rxnfc->rule_cnt = j;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int enetc_set_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *rxnfc)
+{
+	struct enetc_ndev_priv *priv = netdev_priv(ndev);
+	int err;
+
+	switch (rxnfc->cmd) {
+	case ETHTOOL_SRXCLSRLINS:
+		if (rxnfc->fs.location >= priv->si->num_fs_entries)
+			return -EINVAL;
+
+		if (rxnfc->fs.ring_cookie >= priv->num_rx_rings &&
+		    rxnfc->fs.ring_cookie != RX_CLS_FLOW_DISC)
+			return -EINVAL;
+
+		err = enetc_set_cls_entry(priv->si, &rxnfc->fs, true);
+		if (err)
+			return err;
+		priv->cls_rules[rxnfc->fs.location].fs = rxnfc->fs;
+		priv->cls_rules[rxnfc->fs.location].used = 1;
+		break;
+	case ETHTOOL_SRXCLSRLDEL:
+		if (rxnfc->fs.location >= priv->si->num_fs_entries)
+			return -EINVAL;
+
+		err = enetc_set_cls_entry(priv->si, &rxnfc->fs, false);
+		if (err)
+			return err;
+		priv->cls_rules[rxnfc->fs.location].used = 0;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static u32 enetc_get_rxfh_key_size(struct net_device *ndev)
+{
+	struct enetc_ndev_priv *priv = netdev_priv(ndev);
+
+	/* return the size of the RX flow hash key.  PF only */
+	return (priv->si->hw.port) ? ENETC_RSSHASH_KEY_SIZE : 0;
+}
+
+static u32 enetc_get_rxfh_indir_size(struct net_device *ndev)
+{
+	struct enetc_ndev_priv *priv = netdev_priv(ndev);
+
+	/* return the size of the RX flow hash indirection table */
+	return priv->si->num_rss;
+}
+
+static int enetc_get_rxfh(struct net_device *ndev, u32 *indir, u8 *key,
+			  u8 *hfunc)
+{
+	struct enetc_ndev_priv *priv = netdev_priv(ndev);
+	struct enetc_hw *hw = &priv->si->hw;
+	int err = 0, i;
+
+	/* return hash function */
+	if (hfunc)
+		*hfunc = ETH_RSS_HASH_TOP;
+
+	/* return hash key */
+	if (key && hw->port)
+		for (i = 0; i < ENETC_RSSHASH_KEY_SIZE / 4; i++)
+			((u32 *)key)[i] = enetc_port_rd(hw, ENETC_PRSSK(i));
+
+	/* return RSS table */
+	if (indir)
+		err = enetc_get_rss_table(priv->si, indir, priv->si->num_rss);
+
+	return err;
+}
+
+void enetc_set_rss_key(struct enetc_hw *hw, const u8 *bytes)
+{
+	int i;
+
+	for (i = 0; i < ENETC_RSSHASH_KEY_SIZE / 4; i++)
+		enetc_port_wr(hw, ENETC_PRSSK(i), ((u32 *)bytes)[i]);
+}
+
+static int enetc_set_rxfh(struct net_device *ndev, const u32 *indir,
+			  const u8 *key, const u8 hfunc)
+{
+	struct enetc_ndev_priv *priv = netdev_priv(ndev);
+	struct enetc_hw *hw = &priv->si->hw;
+	int err = 0;
+
+	/* set hash key, if PF */
+	if (key && hw->port)
+		enetc_set_rss_key(hw, key);
+
+	/* set RSS table */
+	if (indir)
+		err = enetc_set_rss_table(priv->si, indir, priv->si->num_rss);
+
+	return err;
+}
+
 static void enetc_get_ringparam(struct net_device *ndev,
 				struct ethtool_ringparam *ring)
 {
@@ -297,6 +559,12 @@ static const struct ethtool_ops enetc_pf_ethtool_ops = {
 	.get_sset_count = enetc_get_sset_count,
 	.get_strings = enetc_get_strings,
 	.get_ethtool_stats = enetc_get_ethtool_stats,
+	.get_rxnfc = enetc_get_rxnfc,
+	.set_rxnfc = enetc_set_rxnfc,
+	.get_rxfh_key_size = enetc_get_rxfh_key_size,
+	.get_rxfh_indir_size = enetc_get_rxfh_indir_size,
+	.get_rxfh = enetc_get_rxfh,
+	.set_rxfh = enetc_set_rxfh,
 	.get_ringparam = enetc_get_ringparam,
 	.get_link_ksettings = phy_ethtool_get_link_ksettings,
 	.set_link_ksettings = phy_ethtool_set_link_ksettings,
@@ -308,6 +576,11 @@ static const struct ethtool_ops enetc_vf_ethtool_ops = {
 	.get_sset_count = enetc_get_sset_count,
 	.get_strings = enetc_get_strings,
 	.get_ethtool_stats = enetc_get_ethtool_stats,
+	.get_rxnfc = enetc_get_rxnfc,
+	.set_rxnfc = enetc_set_rxnfc,
+	.get_rxfh_indir_size = enetc_get_rxfh_indir_size,
+	.get_rxfh = enetc_get_rxfh,
+	.set_rxfh = enetc_set_rxfh,
 	.get_ringparam = enetc_get_ringparam,
 };
 
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_hw.h b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
index 82d2831..b705187 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
@@ -13,9 +13,11 @@
 /** SI regs, offset: 0h */
 #define ENETC_SIMR	0
 #define ENETC_SIMR_EN	BIT(31)
+#define ENETC_SIMR_RSSE	BIT(0)
 #define ENETC_SICTR0	0x18
 #define ENETC_SICTR1	0x1c
 #define ENETC_SIPCAPR0	0x20
+#define ENETC_SIPCAPR0_RSS	BIT(8)
 #define ENETC_SIPCAPR1	0x24
 #define ENETC_SITGTGR	0x30
 #define ENETC_SIRBGCR	0x38
@@ -92,6 +94,11 @@ static inline u32 enetc_vsi_set_msize(u32 size)
 
 #define ENETC_SIUEFDCR	0xe28
 
+#define ENETC_SIRFSCAPR	0x1200
+#define ENETC_SIRFSCAPR_GET_NUM_RFS(val) ((val) & 0x7f)
+#define ENETC_SIRSSCAPR	0x1600
+#define ENETC_SIRSSCAPR_GET_NUM_RSS(val) (BIT((val) & 0xf) * 32)
+
 /** SI BDR sub-blocks, n = 0..7 */
 enum enetc_bdr_type {TX, RX};
 #define ENETC_BDR_OFF(i)	((i) * 0x200)
@@ -172,8 +179,15 @@ enum enetc_bdr_type {TX, RX};
 
 #define ENETC_PTCCBSR0(n)	(0x1110 + (n) * 8) /* n = 0 to 7*/
 #define ENETC_PTCCBSR1(n)	(0x1114 + (n) * 8) /* n = 0 to 7*/
+#define ENETC_RSSHASH_KEY_SIZE	40
+#define ENETC_PRSSK(n)		(0x1410 + (n) * 4) /* n = [0..9] */
 #define ENETC_PSIVLANFMR	0x1700
 #define ENETC_PSIVLANFMR_VS	BIT(0)
+#define ENETC_PRFSMR		0x1800
+#define ENETC_PRFSMR_RFSE	BIT(31)
+#define ENETC_PRFSCAPR		0x1804
+#define ENETC_PRFSCAPR_GET_NUM_RFS(val)	((((val) & 0xf) + 1) * 16)
+#define ENETC_PSIRFSCFGR(n)	(0x1814 + (n) * 4) /* n = SI index */
 #define ENETC_PFPMR		0x1900
 #define ENETC_PFPMR_PMACE	BIT(1)
 #define ENETC_PFPMR_MWLM	BIT(0)
@@ -417,6 +431,35 @@ struct enetc_cbd {
 #define ENETC_CBD_FLAGS_SF	BIT(7) /* short format */
 #define ENETC_CBD_STATUS_MASK	0xf
 
+struct enetc_cmd_rfse {
+	u8 smac_h[6];
+	u8 smac_m[6];
+	u8 dmac_h[6];
+	u8 dmac_m[6];
+	u32 sip_h[4];
+	u32 sip_m[4];
+	u32 dip_h[4];
+	u32 dip_m[4];
+	u16 ethtype_h;
+	u16 ethtype_m;
+	u16 ethtype4_h;
+	u16 ethtype4_m;
+	u16 sport_h;
+	u16 sport_m;
+	u16 dport_h;
+	u16 dport_m;
+	u16 vlan_h;
+	u16 vlan_m;
+	u8 proto_h;
+	u8 proto_m;
+	u16 flags;
+	u16 result;
+	u16 mode;
+};
+
+#define ENETC_RFSE_EN	BIT(15)
+#define ENETC_RFSE_MODE_BD	2
+
 static inline void enetc_get_primary_mac_addr(struct enetc_hw *hw, u8 *addr)
 {
 	*(u32 *)addr = __raw_readl(hw->reg + ENETC_SIPMAR0);
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf.c b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
index 98d7c8f..fd17968 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
@@ -435,6 +435,27 @@ static void enetc_port_setup_primary_mac_address(struct enetc_si *si)
 	}
 }
 
+static void enetc_port_assign_rfs_entries(struct enetc_si *si)
+{
+	struct enetc_pf *pf = enetc_si_priv(si);
+	struct enetc_hw *hw = &si->hw;
+	int num_entries, vf_entries, i;
+	u32 val;
+
+	/* split RFS entries between functions */
+	val = enetc_port_rd(hw, ENETC_PRFSCAPR);
+	num_entries = ENETC_PRFSCAPR_GET_NUM_RFS(val);
+	vf_entries = num_entries / (pf->total_vfs + 1);
+
+	for (i = 0; i < pf->total_vfs; i++)
+		enetc_port_wr(hw, ENETC_PSIRFSCFGR(i + 1), vf_entries);
+	enetc_port_wr(hw, ENETC_PSIRFSCFGR(0),
+		      num_entries - vf_entries * pf->total_vfs);
+
+	/* enable RFS on port */
+	enetc_port_wr(hw, ENETC_PRFSMR, ENETC_PRFSMR_RFSE);
+}
+
 static void enetc_port_si_configure(struct enetc_si *si)
 {
 	struct enetc_pf *pf = enetc_si_priv(si);
@@ -514,6 +535,7 @@ static void enetc_configure_port_pmac(struct enetc_hw *hw)
 
 static void enetc_configure_port(struct enetc_pf *pf)
 {
+	u8 hash_key[ENETC_RSSHASH_KEY_SIZE];
 	struct enetc_hw *hw = &pf->si->hw;
 
 	enetc_configure_port_pmac(hw);
@@ -522,6 +544,13 @@ static void enetc_configure_port(struct enetc_pf *pf)
 
 	enetc_port_si_configure(pf->si);
 
+	/* set up hash key */
+	get_random_bytes(hash_key, ENETC_RSSHASH_KEY_SIZE);
+	enetc_set_rss_key(hw, hash_key);
+
+	/* split up RFS entries */
+	enetc_port_assign_rfs_entries(pf->si);
+
 	/* fix-up primary MAC addresses, if not set already */
 	enetc_port_setup_primary_mac_address(pf->si);
 
@@ -648,7 +677,7 @@ static int enetc_pf_set_features(struct net_device *ndev,
 	if (changed & NETIF_F_LOOPBACK)
 		enetc_set_loopback(ndev, !!(features & NETIF_F_LOOPBACK));
 
-	return 0;
+	return enetc_set_features(ndev, features);
 }
 
 static const struct net_device_ops enetc_ndev_ops = {
@@ -693,6 +722,9 @@ static void enetc_pf_netdev_setup(struct enetc_si *si, struct net_device *ndev,
 			 NETIF_F_HW_VLAN_CTAG_RX |
 			 NETIF_F_HW_VLAN_CTAG_FILTER;
 
+	if (si->num_rss)
+		ndev->hw_features |= NETIF_F_RXHASH;
+
 	if (si->errata & ENETC_ERR_TXCSUM) {
 		ndev->hw_features &= ~NETIF_F_HW_CSUM;
 		ndev->features &= ~NETIF_F_HW_CSUM;
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_vf.c b/drivers/net/ethernet/freescale/enetc/enetc_vf.c
index e877178..52cf4dc 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_vf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_vf.c
@@ -97,6 +97,12 @@ static int enetc_vf_set_mac_addr(struct net_device *ndev, void *addr)
 	return 0;
 }
 
+static int enetc_vf_set_features(struct net_device *ndev,
+				 netdev_features_t features)
+{
+	return enetc_set_features(ndev, features);
+}
+
 /* Probing/ Init */
 static const struct net_device_ops enetc_ndev_ops = {
 	.ndo_open		= enetc_open,
@@ -104,6 +110,7 @@ static const struct net_device_ops enetc_ndev_ops = {
 	.ndo_start_xmit		= enetc_xmit,
 	.ndo_get_stats		= enetc_get_stats,
 	.ndo_set_mac_address	= enetc_vf_set_mac_addr,
+	.ndo_set_features	= enetc_vf_set_features,
 	.ndo_do_ioctl		= enetc_ioctl,
 };
 
@@ -132,6 +139,9 @@ static void enetc_vf_netdev_setup(struct enetc_si *si, struct net_device *ndev,
 			 NETIF_F_HW_VLAN_CTAG_TX |
 			 NETIF_F_HW_VLAN_CTAG_RX;
 
+	if (si->num_rss)
+		ndev->hw_features |= NETIF_F_RXHASH;
+
 	if (si->errata & ENETC_ERR_TXCSUM) {
 		ndev->hw_features &= ~NETIF_F_HW_CSUM;
 		ndev->features &= ~NETIF_F_HW_CSUM;
-- 
2.7.4

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