Message-Id: <20170129031325.21911-5-f.fainelli@gmail.com>
Date:   Sat, 28 Jan 2017 19:13:25 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, cphealy@...il.com,
        vivien.didelot@...oirfairelinux.com, andrew@...n.ch,
        Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net-next v2 4/4] net: dsa: bcm_sf2: Add support for ethtool::rxnfc

Add support for configuring classification rules using the
ethtool::rxnfc API.  This is useful to program the switch's CFP/TCAM to
redirect specific packets to specific ports/queues for instance. For
now, we allow any kind of IPv4 5-tuple matching.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/dsa/Makefile      |   1 +
 drivers/net/dsa/bcm_sf2.c     |  14 +
 drivers/net/dsa/bcm_sf2.h     |  17 ++
 drivers/net/dsa/bcm_sf2_cfp.c | 613 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 645 insertions(+)
 create mode 100644 drivers/net/dsa/bcm_sf2_cfp.c

diff --git a/drivers/net/dsa/Makefile b/drivers/net/dsa/Makefile
index 8346e4f9737a..da9893478e21 100644
--- a/drivers/net/dsa/Makefile
+++ b/drivers/net/dsa/Makefile
@@ -1,5 +1,6 @@
 obj-$(CONFIG_NET_DSA_MV88E6060) += mv88e6060.o
 obj-$(CONFIG_NET_DSA_BCM_SF2)	+= bcm_sf2.o
+bcm_sf2-objs			+= bcm_sf2_cfp.o
 obj-$(CONFIG_NET_DSA_QCA8K)	+= qca8k.o
 
 obj-y				+= b53/
diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 637072da3acf..be282b430c50 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -1045,6 +1045,8 @@ static const struct dsa_switch_ops bcm_sf2_ops = {
 	.port_fdb_dump		= b53_fdb_dump,
 	.port_fdb_add		= b53_fdb_add,
 	.port_fdb_del		= b53_fdb_del,
+	.get_rxnfc		= bcm_sf2_get_rxnfc,
+	.set_rxnfc		= bcm_sf2_set_rxnfc,
 };
 
 struct bcm_sf2_of_data {
@@ -1168,6 +1170,12 @@ static int bcm_sf2_sw_probe(struct platform_device *pdev)
 
 	spin_lock_init(&priv->indir_lock);
 	mutex_init(&priv->stats_mutex);
+	mutex_init(&priv->cfp.lock);
+
+	/* CFP rule #0 cannot be used for specific classifications, flag it as
+	 * permanently used
+	 */
+	set_bit(0, priv->cfp.used);
 
 	bcm_sf2_identify_ports(priv, dn->child);
 
@@ -1197,6 +1205,12 @@ static int bcm_sf2_sw_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	ret = bcm_sf2_cfp_rst(priv);
+	if (ret) {
+		pr_err("failed to reset CFP\n");
+		goto out_mdio;
+	}
+
 	/* Disable all interrupts and request them */
 	bcm_sf2_intr_disable(priv);
 
diff --git a/drivers/net/dsa/bcm_sf2.h b/drivers/net/dsa/bcm_sf2.h
index 6e1f74e4d471..7d3030e04f11 100644
--- a/drivers/net/dsa/bcm_sf2.h
+++ b/drivers/net/dsa/bcm_sf2.h
@@ -52,6 +52,13 @@ struct bcm_sf2_port_status {
 	struct ethtool_eee eee;
 };
 
+struct bcm_sf2_cfp_priv {
+	/* Mutex protecting concurrent accesses to the CFP registers */
+	struct mutex lock;
+	DECLARE_BITMAP(used, CFP_NUM_RULES);
+	unsigned int rules_cnt;
+};
+
 struct bcm_sf2_priv {
 	/* Base registers, keep those in order with BCM_SF2_REGS_NAME */
 	void __iomem			*core;
@@ -103,6 +110,9 @@ struct bcm_sf2_priv {
 
 	/* Bitmask of ports needing BRCM tags */
 	unsigned int			brcm_tag_mask;
+
+	/* CFP rules context */
+	struct bcm_sf2_cfp_priv		cfp;
 };
 
 static inline struct bcm_sf2_priv *bcm_sf2_to_priv(struct dsa_switch *ds)
@@ -197,4 +207,11 @@ SF2_IO_MACRO(acb);
 SWITCH_INTR_L2(0);
 SWITCH_INTR_L2(1);
 
+/* RXNFC */
+int bcm_sf2_get_rxnfc(struct dsa_switch *ds, int port,
+		      struct ethtool_rxnfc *nfc, u32 *rule_locs);
+int bcm_sf2_set_rxnfc(struct dsa_switch *ds, int port,
+		      struct ethtool_rxnfc *nfc);
+int bcm_sf2_cfp_rst(struct bcm_sf2_priv *priv);
+
 #endif /* __BCM_SF2_H */
diff --git a/drivers/net/dsa/bcm_sf2_cfp.c b/drivers/net/dsa/bcm_sf2_cfp.c
new file mode 100644
index 000000000000..c71be3e0dc2d
--- /dev/null
+++ b/drivers/net/dsa/bcm_sf2_cfp.c
@@ -0,0 +1,613 @@
+/*
+ * Broadcom Starfighter 2 DSA switch CFP support
+ *
+ * Copyright (C) 2016, Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/list.h>
+#include <net/dsa.h>
+#include <linux/ethtool.h>
+#include <linux/if_ether.h>
+#include <linux/in.h>
+#include <linux/bitmap.h>
+
+#include "bcm_sf2.h"
+#include "bcm_sf2_regs.h"
+
+struct cfp_udf_layout {
+	u8 slices[UDF_NUM_SLICES];
+	u32 mask_value;
+
+};
+
+/* UDF slices layout for a TCPv4/UDPv4 specification */
+static const struct cfp_udf_layout udf_tcpip4_layout = {
+	.slices = {
+		/* End of L2, byte offset 12, src IP[0:15] */
+		CFG_UDF_EOL2 | 6,
+		/* End of L2, byte offset 14, src IP[16:31] */
+		CFG_UDF_EOL2 | 7,
+		/* End of L2, byte offset 16, dst IP[0:15] */
+		CFG_UDF_EOL2 | 8,
+		/* End of L2, byte offset 18, dst IP[16:31] */
+		CFG_UDF_EOL2 | 9,
+		/* End of L3, byte offset 0, src port */
+		CFG_UDF_EOL3 | 0,
+		/* End of L3, byte offset 2, dst port */
+		CFG_UDF_EOL3 | 1,
+		0, 0, 0
+	},
+	.mask_value = L3_FRAMING_MASK | IPPROTO_MASK | IP_FRAG,
+};
+
+static inline unsigned int bcm_sf2_get_num_udf_slices(const u8 *layout)
+{
+	unsigned int i, count = 0;
+
+	for (i = 0; i < UDF_NUM_SLICES; i++) {
+		if (layout[i] != 0)
+			count++;
+	}
+
+	return count;
+}
+
+static void bcm_sf2_cfp_udf_set(struct bcm_sf2_priv *priv,
+				unsigned int slice_num,
+				const u8 *layout)
+{
+	u32 offset = CORE_UDF_0_A_0_8_PORT_0 + slice_num * UDF_SLICE_OFFSET;
+	unsigned int i;
+
+	for (i = 0; i < UDF_NUM_SLICES; i++)
+		core_writel(priv, layout[i], offset + i * 4);
+}
+
+static int bcm_sf2_cfp_op(struct bcm_sf2_priv *priv, unsigned int op)
+{
+	unsigned int timeout = 1000;
+	u32 reg;
+
+	reg = core_readl(priv, CORE_CFP_ACC);
+	reg &= ~(OP_SEL_MASK | RAM_SEL_MASK);
+	reg |= OP_STR_DONE | op;
+	core_writel(priv, reg, CORE_CFP_ACC);
+
+	do {
+		reg = core_readl(priv, CORE_CFP_ACC);
+		if (!(reg & OP_STR_DONE))
+			break;
+
+		cpu_relax();
+	} while (timeout--);
+
+	if (!timeout)
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+static inline void bcm_sf2_cfp_rule_addr_set(struct bcm_sf2_priv *priv,
+					     unsigned int addr)
+{
+	u32 reg;
+
+	WARN_ON(addr >= CFP_NUM_RULES);
+
+	reg = core_readl(priv, CORE_CFP_ACC);
+	reg &= ~(XCESS_ADDR_MASK << XCESS_ADDR_SHIFT);
+	reg |= addr << XCESS_ADDR_SHIFT;
+	core_writel(priv, reg, CORE_CFP_ACC);
+}
+
+static inline unsigned int bcm_sf2_cfp_rule_size(struct bcm_sf2_priv *priv)
+{
+	/* Entry #0 is reserved */
+	return CFP_NUM_RULES - 1;
+}
+
+static int bcm_sf2_cfp_rule_set(struct dsa_switch *ds, int port,
+				struct ethtool_rx_flow_spec *fs)
+{
+	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
+	struct ethtool_tcpip4_spec *v4_spec;
+	const struct cfp_udf_layout *layout;
+	unsigned int slice_num, rule_index;
+	unsigned int queue_num, port_num;
+	u8 ip_proto, ip_frag;
+	u8 num_udf;
+	u32 reg;
+	int ret;
+
+	/* Check for unsupported extensions */
+	if ((fs->flow_type & FLOW_EXT) &&
+	    (fs->m_ext.vlan_etype || fs->m_ext.data[1]))
+		return -EINVAL;
+
+	if (fs->location != RX_CLS_LOC_ANY &&
+	    test_bit(fs->location, priv->cfp.used))
+		return -EBUSY;
+
+	if (fs->location != RX_CLS_LOC_ANY &&
+	    fs->location > bcm_sf2_cfp_rule_size(priv))
+		return -EINVAL;
+
+	ip_frag = be32_to_cpu(fs->m_ext.data[0]);
+
+	/* We do not support discarding packets, check that the
+	 * destination port is enabled and that we are within the
+	 * number of ports supported by the switch
+	 */
+	port_num = fs->ring_cookie / 8;
+
+	if (fs->ring_cookie == RX_CLS_FLOW_DISC ||
+	    !(BIT(port_num) & ds->enabled_port_mask) ||
+	    port_num >= priv->hw_params.num_ports)
+		return -EINVAL;
+
+	switch (fs->flow_type & ~FLOW_EXT) {
+	case TCP_V4_FLOW:
+		ip_proto = IPPROTO_TCP;
+		v4_spec = &fs->h_u.tcp_ip4_spec;
+		break;
+	case UDP_V4_FLOW:
+		ip_proto = IPPROTO_UDP;
+		v4_spec = &fs->h_u.udp_ip4_spec;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* We only use one UDF slice for now */
+	slice_num = 1;
+	layout = &udf_tcpip4_layout;
+	num_udf = bcm_sf2_get_num_udf_slices(layout->slices);
+
+	/* Apply the UDF layout for this filter */
+	bcm_sf2_cfp_udf_set(priv, slice_num, layout->slices);
+
+	/* Apply to all packets received through this port */
+	core_writel(priv, BIT(port), CORE_CFP_DATA_PORT(7));
+
+	/* S-Tag status		[31:30]
+	 * C-Tag status		[29:28]
+	 * L2 framing		[27:26]
+	 * L3 framing		[25:24]
+	 * IP ToS		[23:16]
+	 * IP proto		[15:08]
+	 * IP Fragm		[7]
+	 * Non 1st frag		[6]
+	 * IP Authen		[5]
+	 * TTL range		[4:3]
+	 * PPPoE session	[2]
+	 * Reserved		[1]
+	 * UDF_Valid[8]		[0]
+	 */
+	core_writel(priv, v4_spec->tos << 16 | ip_proto << 8 | ip_frag << 7,
+		    CORE_CFP_DATA_PORT(6));
+
+	/* UDF_Valid[7:0]	[31:24]
+	 * S-Tag		[23:8]
+	 * C-Tag		[7:0]
+	 */
+	core_writel(priv, GENMASK(num_udf - 1, 0) << 24, CORE_CFP_DATA_PORT(5));
+
+	/* C-Tag		[31:24]
+	 * UDF_n_A8		[23:8]
+	 * UDF_n_A7		[7:0]
+	 */
+	core_writel(priv, 0, CORE_CFP_DATA_PORT(4));
+
+	/* UDF_n_A7		[31:24]
+	 * UDF_n_A6		[23:8]
+	 * UDF_n_A5		[7:0]
+	 */
+	core_writel(priv, be16_to_cpu(v4_spec->pdst) >> 8,
+		    CORE_CFP_DATA_PORT(3));
+
+	/* UDF_n_A5		[31:24]
+	 * UDF_n_A4		[23:8]
+	 * UDF_n_A3		[7:0]
+	 */
+	reg = (be16_to_cpu(v4_spec->pdst) & 0xff) << 24 |
+	      (u32)be16_to_cpu(v4_spec->psrc) << 8 |
+	      (be32_to_cpu(v4_spec->ip4dst) & 0x0000ff00) >> 8;
+	core_writel(priv, reg, CORE_CFP_DATA_PORT(2));
+
+	/* UDF_n_A3		[31:24]
+	 * UDF_n_A2		[23:8]
+	 * UDF_n_A1		[7:0]
+	 */
+	reg = (u32)(be32_to_cpu(v4_spec->ip4dst) & 0xff) << 24 |
+	      (u32)(be32_to_cpu(v4_spec->ip4dst) >> 16) << 8 |
+	      (be32_to_cpu(v4_spec->ip4src) & 0x0000ff00) >> 8;
+	core_writel(priv, reg, CORE_CFP_DATA_PORT(1));
+
+	/* UDF_n_A1		[31:24]
+	 * UDF_n_A0		[23:8]
+	 * Reserved		[7:4]
+	 * Slice ID		[3:2]
+	 * Slice valid		[1:0]
+	 */
+	reg = (u32)(be32_to_cpu(v4_spec->ip4src) & 0xff) << 24 |
+	      (u32)(be32_to_cpu(v4_spec->ip4src) >> 16) << 8 |
+	      SLICE_NUM(slice_num) | SLICE_VALID;
+	core_writel(priv, reg, CORE_CFP_DATA_PORT(0));
+
+	/* Source port map match */
+	core_writel(priv, 0xff, CORE_CFP_MASK_PORT(7));
+
+	/* Mask with the specific layout for IPv4 packets */
+	core_writel(priv, layout->mask_value, CORE_CFP_MASK_PORT(6));
+
+	/* Mask all but valid UDFs */
+	core_writel(priv, GENMASK(num_udf - 1, 0) << 24, CORE_CFP_MASK_PORT(5));
+
+	/* Mask all */
+	core_writel(priv, 0, CORE_CFP_MASK_PORT(4));
+
+	/* All other UDFs should be matched with the filter */
+	core_writel(priv, 0xff, CORE_CFP_MASK_PORT(3));
+	core_writel(priv, 0xffffffff, CORE_CFP_MASK_PORT(2));
+	core_writel(priv, 0xffffffff, CORE_CFP_MASK_PORT(1));
+	core_writel(priv, 0xffffff0f, CORE_CFP_MASK_PORT(0));
+
+	/* Locate the first rule available */
+	if (fs->location == RX_CLS_LOC_ANY)
+		rule_index = find_first_zero_bit(priv->cfp.used,
+						 bcm_sf2_cfp_rule_size(priv));
+	else
+		rule_index = fs->location;
+
+	/* Insert into TCAM now */
+	bcm_sf2_cfp_rule_addr_set(priv, rule_index);
+
+	ret = bcm_sf2_cfp_op(priv, OP_SEL_WRITE | TCAM_SEL);
+	if (ret) {
+		pr_err("TCAM entry at addr %d failed\n", rule_index);
+		return ret;
+	}
+
+	/* Replace ARL derived destination with DST_MAP derived, define
+	 * which port and queue this should be forwarded to.
+	 *
+	 * We have a small oddity where Port 6 just does not have a
+	 * valid bit here (so we subtract by one).
+	 */
+	queue_num = fs->ring_cookie % 8;
+	if (port_num >= 7)
+		port_num -= 1;
+
+	reg = CHANGE_FWRD_MAP_IB_REP_ARL | BIT(port_num + DST_MAP_IB_SHIFT) |
+		CHANGE_TC | queue_num << NEW_TC_SHIFT;
+
+	core_writel(priv, reg, CORE_ACT_POL_DATA0);
+
+	/* Set classification ID that needs to be put in Broadcom tag */
+	core_writel(priv, rule_index << CHAIN_ID_SHIFT,
+		    CORE_ACT_POL_DATA1);
+
+	core_writel(priv, 0, CORE_ACT_POL_DATA2);
+
+	/* Configure policer RAM now */
+	ret = bcm_sf2_cfp_op(priv, OP_SEL_WRITE | ACT_POL_RAM);
+	if (ret) {
+		pr_err("Policer entry at %d failed\n", rule_index);
+		return ret;
+	}
+
+	/* Disable the policer */
+	core_writel(priv, POLICER_MODE_DISABLE, CORE_RATE_METER0);
+
+	/* Now the rate meter */
+	ret = bcm_sf2_cfp_op(priv, OP_SEL_WRITE | RATE_METER_RAM);
+	if (ret) {
+		pr_err("Meter entry at %d failed\n", rule_index);
+		return ret;
+	}
+
+	/* Turn on CFP for this rule now */
+	reg = core_readl(priv, CORE_CFP_CTL_REG);
+	reg |= BIT(port);
+	core_writel(priv, reg, CORE_CFP_CTL_REG);
+
+	/* Flag the rule as being used and return it */
+	set_bit(rule_index, priv->cfp.used);
+	fs->location = rule_index;
+
+	return 0;
+}
+
+static int bcm_sf2_cfp_rule_del(struct bcm_sf2_priv *priv, int port,
+				u32 loc)
+{
+	int ret;
+	u32 reg;
+
+	/* Refuse deletion of unused rules, and the default reserved rule */
+	if (!test_bit(loc, priv->cfp.used) || loc == 0)
+		return -EINVAL;
+
+	/* Indicate which rule we want to read */
+	bcm_sf2_cfp_rule_addr_set(priv, loc);
+
+	ret =  bcm_sf2_cfp_op(priv, OP_SEL_READ | TCAM_SEL);
+	if (ret)
+		return ret;
+
+	/* Clear its valid bits */
+	reg = core_readl(priv, CORE_CFP_DATA_PORT(0));
+	reg &= ~SLICE_VALID;
+	core_writel(priv, reg, CORE_CFP_DATA_PORT(0));
+
+	/* Write back this entry into the TCAM now */
+	ret = bcm_sf2_cfp_op(priv, OP_SEL_WRITE | TCAM_SEL);
+	if (ret)
+		return ret;
+
+	clear_bit(loc, priv->cfp.used);
+
+	return 0;
+}
+
+static void bcm_sf2_invert_masks(struct ethtool_rx_flow_spec *flow)
+{
+	unsigned int i;
+
+	for (i = 0; i < sizeof(flow->m_u); i++)
+		flow->m_u.hdata[i] ^= 0xff;
+
+	flow->m_ext.vlan_etype ^= cpu_to_be16(~0);
+	flow->m_ext.vlan_tci ^= cpu_to_be16(~0);
+	flow->m_ext.data[0] ^= cpu_to_be32(~0);
+	flow->m_ext.data[1] ^= cpu_to_be32(~0);
+}
+
+static int bcm_sf2_cfp_rule_get(struct bcm_sf2_priv *priv, int port,
+				struct ethtool_rxnfc *nfc, bool search)
+{
+	struct ethtool_tcpip4_spec *v4_spec;
+	unsigned int queue_num;
+	u16 src_dst_port;
+	u32 reg, ipv4;
+	int ret;
+
+	if (!search) {
+		bcm_sf2_cfp_rule_addr_set(priv, nfc->fs.location);
+
+		ret = bcm_sf2_cfp_op(priv, OP_SEL_READ | ACT_POL_RAM);
+		if (ret)
+			return ret;
+
+		reg = core_readl(priv, CORE_ACT_POL_DATA0);
+
+		ret = bcm_sf2_cfp_op(priv, OP_SEL_READ | TCAM_SEL);
+		if (ret)
+			return ret;
+	} else {
+		reg = core_readl(priv, CORE_ACT_POL_DATA0);
+	}
+
+	/* Extract the destination port */
+	nfc->fs.ring_cookie = fls((reg >> DST_MAP_IB_SHIFT) &
+				  DST_MAP_IB_MASK) - 1;
+
+	/* There is no Port 6, so we compensate for that here */
+	if (nfc->fs.ring_cookie >= 6)
+		nfc->fs.ring_cookie++;
+	nfc->fs.ring_cookie *= 8;
+
+	/* Extract the destination queue */
+	queue_num = (reg >> NEW_TC_SHIFT) & NEW_TC_MASK;
+	nfc->fs.ring_cookie += queue_num;
+
+	/* Extract the IP protocol */
+	reg = core_readl(priv, CORE_CFP_DATA_PORT(6));
+	switch ((reg & IPPROTO_MASK) >> IPPROTO_SHIFT) {
+	case IPPROTO_TCP:
+		nfc->fs.flow_type = TCP_V4_FLOW;
+		v4_spec = &nfc->fs.h_u.tcp_ip4_spec;
+		break;
+	case IPPROTO_UDP:
+		nfc->fs.flow_type = UDP_V4_FLOW;
+		v4_spec = &nfc->fs.h_u.udp_ip4_spec;
+		break;
+	default:
+		/* Clear to exit the search process */
+		if (search)
+			core_readl(priv, CORE_CFP_DATA_PORT(7));
+		return -EINVAL;
+	}
+
+	v4_spec->tos = (reg >> 16) & IPPROTO_MASK;
+	nfc->fs.m_ext.data[0] = cpu_to_be32((reg >> 7) & 1);
+
+	reg = core_readl(priv, CORE_CFP_DATA_PORT(3));
+	/* src port [15:8] */
+	src_dst_port = reg << 8;
+
+	reg = core_readl(priv, CORE_CFP_DATA_PORT(2));
+	/* src port [7:0] */
+	src_dst_port |= (reg >> 24);
+
+	v4_spec->pdst = cpu_to_be16(src_dst_port);
+	nfc->fs.m_u.tcp_ip4_spec.pdst = cpu_to_be16(~0);
+	v4_spec->psrc = cpu_to_be16((u16)(reg >> 8));
+	nfc->fs.m_u.tcp_ip4_spec.psrc = cpu_to_be16(~0);
+
+	/* IPv4 dst [15:8] */
+	ipv4 = (u16)(reg & 0xff) << 8;
+	reg = core_readl(priv, CORE_CFP_DATA_PORT(1));
+	/* IPv4 dst [31:16] */
+	ipv4 |= (u32)((reg >> 8) & 0xffffff) << 16;
+	/* IPv4 dst [7:0] */
+	ipv4 |= (reg >> 24) & 0xff;
+	v4_spec->ip4dst = cpu_to_be32(ipv4);
+	nfc->fs.m_u.tcp_ip4_spec.ip4dst = cpu_to_be32(~0);
+
+	/* IPv4 src [15:8] */
+	ipv4 = (u16)(reg & 0xff) << 8;
+	reg = core_readl(priv, CORE_CFP_DATA_PORT(0));
+
+	if (!(reg & SLICE_VALID))
+		return -EINVAL;
+
+	/* IPv4 src [7:0] */
+	ipv4 |= (reg >> 24) & 0xff;
+	/* IPv4 src [31:16] */
+	ipv4 |= ((reg >> 8) & 0xffffff) << 16;
+	v4_spec->ip4src = cpu_to_be32(ipv4);
+	nfc->fs.m_u.tcp_ip4_spec.ip4src = cpu_to_be32(~0);
+
+	/* Read last to avoid next entry clobbering the results during search
+	 * operations
+	 */
+	reg = core_readl(priv, CORE_CFP_DATA_PORT(7));
+	if (!(reg & 1 << port))
+		return -EINVAL;
+
+	bcm_sf2_invert_masks(&nfc->fs);
+
+	/* Put the TCAM size here */
+	nfc->data = bcm_sf2_cfp_rule_size(priv);
+
+	return 0;
+}
+
+/* We implement the search doing a TCAM search operation */
+static int bcm_sf2_cfp_rule_get_all(struct bcm_sf2_priv *priv,
+				    int port, struct ethtool_rxnfc *nfc,
+				    u32 *rule_locs)
+{
+	unsigned int index = 1, rules_cnt = 0;
+	int ret;
+	u32 reg;
+
+	/* Do not poll on OP_STR_DONE to be self-clearing for search
+	 * operations, we cannot use bcm_sf2_cfp_op here because it completes
+	 * on clearing OP_STR_DONE which won't clear until the entire search
+	 * operation is over.
+	 */
+	reg = core_readl(priv, CORE_CFP_ACC);
+	reg &= ~(XCESS_ADDR_MASK << XCESS_ADDR_SHIFT);
+	reg |= index << XCESS_ADDR_SHIFT;
+	reg &= ~(OP_SEL_MASK | RAM_SEL_MASK);
+	reg |= OP_SEL_SEARCH | TCAM_SEL | OP_STR_DONE;
+	core_writel(priv, reg, CORE_CFP_ACC);
+
+	do {
+		/* Wait for results to be ready */
+		reg = core_readl(priv, CORE_CFP_ACC);
+
+		/* Extract the address we are searching */
+		index = reg >> XCESS_ADDR_SHIFT;
+		index &= XCESS_ADDR_MASK;
+
+		/* We have a valid search result, so flag it accordingly */
+		if (reg & SEARCH_STS) {
+			ret = bcm_sf2_cfp_rule_get(priv, port, nfc, true);
+			if (ret)
+				continue;
+
+			rule_locs[rules_cnt] = index;
+			rules_cnt++;
+		}
+
+		/* Search is over break out */
+		if (!(reg & OP_STR_DONE))
+			break;
+
+	} while (index < CFP_NUM_RULES);
+
+	/* Put the TCAM size here */
+	nfc->data = bcm_sf2_cfp_rule_size(priv);
+	nfc->rule_cnt = rules_cnt;
+
+	return 0;
+}
+
+int bcm_sf2_get_rxnfc(struct dsa_switch *ds, int port,
+		      struct ethtool_rxnfc *nfc, u32 *rule_locs)
+{
+	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
+	int ret = 0;
+
+	mutex_lock(&priv->cfp.lock);
+
+	switch (nfc->cmd) {
+	case ETHTOOL_GRXCLSRLCNT:
+		/* Subtract the default, unusable rule */
+		nfc->rule_cnt = bitmap_weight(priv->cfp.used,
+					      CFP_NUM_RULES) - 1;
+		/* We support specifying rule locations */
+		nfc->data |= RX_CLS_LOC_SPECIAL;
+		break;
+	case ETHTOOL_GRXCLSRULE:
+		ret = bcm_sf2_cfp_rule_get(priv, port, nfc, false);
+		break;
+	case ETHTOOL_GRXCLSRLALL:
+		ret = bcm_sf2_cfp_rule_get_all(priv, port, nfc, rule_locs);
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+		break;
+	}
+
+	mutex_unlock(&priv->cfp.lock);
+
+	return ret;
+}
+
+int bcm_sf2_set_rxnfc(struct dsa_switch *ds, int port,
+		      struct ethtool_rxnfc *nfc)
+{
+	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
+	int ret = 0;
+
+	mutex_lock(&priv->cfp.lock);
+
+	switch (nfc->cmd) {
+	case ETHTOOL_SRXCLSRLINS:
+		ret = bcm_sf2_cfp_rule_set(ds, port, &nfc->fs);
+		break;
+
+	case ETHTOOL_SRXCLSRLDEL:
+		ret = bcm_sf2_cfp_rule_del(priv, port, nfc->fs.location);
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+		break;
+	}
+
+	mutex_unlock(&priv->cfp.lock);
+
+	return ret;
+}
+
+int bcm_sf2_cfp_rst(struct bcm_sf2_priv *priv)
+{
+	unsigned int timeout = 1000;
+	u32 reg;
+
+	reg = core_readl(priv, CORE_CFP_ACC);
+	reg |= TCAM_RESET;
+	core_writel(priv, reg, CORE_CFP_ACC);
+
+	do {
+		reg = core_readl(priv, CORE_CFP_ACC);
+		if (!(reg & TCAM_RESET))
+			break;
+
+		cpu_relax();
+	} while (timeout--);
+
+	if (!timeout)
+		return -ETIMEDOUT;
+
+	return 0;
+}
-- 
2.9.3

Powered by blists - more mailing lists