octeontx2-af: cn10k: Introduce driver for macsec block.

CN10K-B and CNF10K-B has macsec block(MCS) to encrypt and
decrypt packets at MAC level. This block is a global resource
with hardware resources like SecYs, SCs and SAs and is in
between NIX block and RPM LMAC. CN10K-B silicon has only one MCS
block which receives packets from all LMACS whereas CNF10K-B has
seven MCS blocks for seven LMACs. Both MCS blocks are
similar in operation except for few register offsets and some
configurations require writing to different registers. Those
differences between IPs are handled using separate ops.
This patch adds basic driver and does the initial hardware
calibration and parser configuration.

Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 368 insertions, 0 deletions

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mcs.c b/drivers/net/ethernet/marvell/octeontx2/af/mcs.c
new file mode 100644
index 000000000000..259ccb42af6b
--- /dev/null
+++ b/drivers/net/ethernet/marvell/octeontx2/af/mcs.c
@@ -0,0 +1,368 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Marvell MCS driver
+ *
+ * Copyright (C) 2022 Marvell.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include "mcs.h"
+#include "mcs_reg.h"
+
+#define DRV_NAME	"Marvell MCS Driver"
+
+#define PCI_CFG_REG_BAR_NUM	0
+
+static const struct pci_device_id mcs_id_table[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVID_CN10K_MCS) },
+	{ 0, }  /* end of table */
+};
+
+static LIST_HEAD(mcs_list);
+
+static void *alloc_mem(struct mcs *mcs, int n)
+{
+	return devm_kcalloc(mcs->dev, n, sizeof(u16), GFP_KERNEL);
+}
+
+static int mcs_alloc_struct_mem(struct mcs *mcs, struct mcs_rsrc_map *res)
+{
+	struct hwinfo *hw = mcs->hw;
+	int err;
+
+	res->flowid2pf_map = alloc_mem(mcs, hw->tcam_entries);
+	if (!res->flowid2pf_map)
+		return -ENOMEM;
+
+	res->secy2pf_map = alloc_mem(mcs, hw->secy_entries);
+	if (!res->secy2pf_map)
+		return -ENOMEM;
+
+	res->sc2pf_map = alloc_mem(mcs, hw->sc_entries);
+	if (!res->sc2pf_map)
+		return -ENOMEM;
+
+	res->sa2pf_map = alloc_mem(mcs, hw->sa_entries);
+	if (!res->sa2pf_map)
+		return -ENOMEM;
+
+	res->flowid2secy_map = alloc_mem(mcs, hw->tcam_entries);
+	if (!res->flowid2secy_map)
+		return -ENOMEM;
+
+	res->flow_ids.max = hw->tcam_entries - MCS_RSRC_RSVD_CNT;
+	err = rvu_alloc_bitmap(&res->flow_ids);
+	if (err)
+		return err;
+
+	res->secy.max = hw->secy_entries - MCS_RSRC_RSVD_CNT;
+	err = rvu_alloc_bitmap(&res->secy);
+	if (err)
+		return err;
+
+	res->sc.max = hw->sc_entries;
+	err = rvu_alloc_bitmap(&res->sc);
+	if (err)
+		return err;
+
+	res->sa.max = hw->sa_entries;
+	err = rvu_alloc_bitmap(&res->sa);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+int mcs_get_blkcnt(void)
+{
+	struct mcs *mcs;
+	int idmax = -ENODEV;
+
+	/* Check MCS block is present in hardware */
+	if (!pci_dev_present(mcs_id_table))
+		return 0;
+
+	list_for_each_entry(mcs, &mcs_list, mcs_list)
+		if (mcs->mcs_id > idmax)
+			idmax = mcs->mcs_id;
+
+	if (idmax < 0)
+		return 0;
+
+	return idmax + 1;
+}
+
+struct mcs *mcs_get_pdata(int mcs_id)
+{
+	struct mcs *mcs_dev;
+
+	list_for_each_entry(mcs_dev, &mcs_list, mcs_list) {
+		if (mcs_dev->mcs_id == mcs_id)
+			return mcs_dev;
+	}
+	return NULL;
+}
+
+/* Set lmac to bypass/operational mode */
+void mcs_set_lmac_mode(struct mcs *mcs, int lmac_id, u8 mode)
+{
+	u64 reg;
+
+	reg = MCSX_MCS_TOP_SLAVE_CHANNEL_CFG(lmac_id * 2);
+	mcs_reg_write(mcs, reg, (u64)mode);
+}
+
+void cn10kb_mcs_parser_cfg(struct mcs *mcs)
+{
+	u64 reg, val;
+
+	/* VLAN CTag */
+	val = BIT_ULL(0) | (0x8100ull & 0xFFFF) << 1 | BIT_ULL(17);
+	/* RX */
+	reg = MCSX_PEX_RX_SLAVE_VLAN_CFGX(0);
+	mcs_reg_write(mcs, reg, val);
+
+	/* TX */
+	reg = MCSX_PEX_TX_SLAVE_VLAN_CFGX(0);
+	mcs_reg_write(mcs, reg, val);
+
+	/* VLAN STag */
+	val = BIT_ULL(0) | (0x88a8ull & 0xFFFF) << 1 | BIT_ULL(18);
+	/* RX */
+	reg = MCSX_PEX_RX_SLAVE_VLAN_CFGX(1);
+	mcs_reg_write(mcs, reg, val);
+
+	/* TX */
+	reg = MCSX_PEX_TX_SLAVE_VLAN_CFGX(1);
+	mcs_reg_write(mcs, reg, val);
+}
+
+static void mcs_lmac_init(struct mcs *mcs, int lmac_id)
+{
+	u64 reg;
+
+	/* Port mode 25GB */
+	reg = MCSX_PAB_RX_SLAVE_PORT_CFGX(lmac_id);
+	mcs_reg_write(mcs, reg, 0);
+
+	if (mcs->hw->mcs_blks > 1) {
+		reg = MCSX_PAB_RX_SLAVE_FIFO_SKID_CFGX(lmac_id);
+		mcs_reg_write(mcs, reg, 0xe000e);
+		return;
+	}
+
+	reg = MCSX_PAB_TX_SLAVE_PORT_CFGX(lmac_id);
+	mcs_reg_write(mcs, reg, 0);
+}
+
+int mcs_set_lmac_channels(int mcs_id, u16 base)
+{
+	struct mcs *mcs;
+	int lmac;
+	u64 cfg;
+
+	mcs = mcs_get_pdata(mcs_id);
+	if (!mcs)
+		return -ENODEV;
+	for (lmac = 0; lmac < mcs->hw->lmac_cnt; lmac++) {
+		cfg = mcs_reg_read(mcs, MCSX_LINK_LMACX_CFG(lmac));
+		cfg &= ~(MCSX_LINK_LMAC_BASE_MASK | MCSX_LINK_LMAC_RANGE_MASK);
+		cfg |=	FIELD_PREP(MCSX_LINK_LMAC_RANGE_MASK, ilog2(16));
+		cfg |=	FIELD_PREP(MCSX_LINK_LMAC_BASE_MASK, base);
+		mcs_reg_write(mcs, MCSX_LINK_LMACX_CFG(lmac), cfg);
+		base += 16;
+	}
+	return 0;
+}
+
+static int mcs_x2p_calibration(struct mcs *mcs)
+{
+	unsigned long timeout = jiffies + usecs_to_jiffies(20000);
+	int i, err = 0;
+	u64 val;
+
+	/* set X2P calibration */
+	val = mcs_reg_read(mcs, MCSX_MIL_GLOBAL);
+	val |= BIT_ULL(5);
+	mcs_reg_write(mcs, MCSX_MIL_GLOBAL, val);
+
+	/* Wait for calibration to complete */
+	while (!(mcs_reg_read(mcs, MCSX_MIL_RX_GBL_STATUS) & BIT_ULL(0))) {
+		if (time_before(jiffies, timeout)) {
+			usleep_range(80, 100);
+			continue;
+		} else {
+			err = -EBUSY;
+			dev_err(mcs->dev, "MCS X2P calibration failed..ignoring\n");
+			return err;
+		}
+	}
+
+	val = mcs_reg_read(mcs, MCSX_MIL_RX_GBL_STATUS);
+	for (i = 0; i < mcs->hw->mcs_x2p_intf; i++) {
+		if (val & BIT_ULL(1 + i))
+			continue;
+		err = -EBUSY;
+		dev_err(mcs->dev, "MCS:%d didn't respond to X2P calibration\n", i);
+	}
+	/* Clear X2P calibrate */
+	mcs_reg_write(mcs, MCSX_MIL_GLOBAL, mcs_reg_read(mcs, MCSX_MIL_GLOBAL) & ~BIT_ULL(5));
+
+	return err;
+}
+
+static void mcs_set_external_bypass(struct mcs *mcs, u8 bypass)
+{
+	u64 val;
+
+	/* Set MCS to external bypass */
+	val = mcs_reg_read(mcs, MCSX_MIL_GLOBAL);
+	if (bypass)
+		val |= BIT_ULL(6);
+	else
+		val &= ~BIT_ULL(6);
+	mcs_reg_write(mcs, MCSX_MIL_GLOBAL, val);
+}
+
+static void mcs_global_cfg(struct mcs *mcs)
+{
+	/* Disable external bypass */
+	mcs_set_external_bypass(mcs, false);
+
+	/* Set MCS to perform standard IEEE802.1AE macsec processing */
+	if (mcs->hw->mcs_blks == 1) {
+		mcs_reg_write(mcs, MCSX_IP_MODE, BIT_ULL(3));
+		return;
+	}
+
+	mcs_reg_write(mcs, MCSX_BBE_RX_SLAVE_CAL_ENTRY, 0xe4);
+	mcs_reg_write(mcs, MCSX_BBE_RX_SLAVE_CAL_LEN, 4);
+}
+
+void cn10kb_mcs_set_hw_capabilities(struct mcs *mcs)
+{
+	struct hwinfo *hw = mcs->hw;
+
+	hw->tcam_entries = 128;		/* TCAM entries */
+	hw->secy_entries  = 128;	/* SecY entries */
+	hw->sc_entries = 128;		/* SC CAM entries */
+	hw->sa_entries = 256;		/* SA entries */
+	hw->lmac_cnt = 20;		/* lmacs/ports per mcs block */
+	hw->mcs_x2p_intf = 5;		/* x2p clabration intf */
+	hw->mcs_blks = 1;		/* MCS blocks */
+}
+
+static struct mcs_ops cn10kb_mcs_ops = {
+	.mcs_set_hw_capabilities	= cn10kb_mcs_set_hw_capabilities,
+	.mcs_parser_cfg			= cn10kb_mcs_parser_cfg,
+};
+
+static int mcs_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct device *dev = &pdev->dev;
+	int lmac, err = 0;
+	struct mcs *mcs;
+
+	mcs = devm_kzalloc(dev, sizeof(*mcs), GFP_KERNEL);
+	if (!mcs)
+		return -ENOMEM;
+
+	mcs->hw = devm_kzalloc(dev, sizeof(struct hwinfo), GFP_KERNEL);
+	if (!mcs->hw)
+		return -ENOMEM;
+
+	err = pci_enable_device(pdev);
+	if (err) {
+		dev_err(dev, "Failed to enable PCI device\n");
+		pci_set_drvdata(pdev, NULL);
+		return err;
+	}
+
+	err = pci_request_regions(pdev, DRV_NAME);
+	if (err) {
+		dev_err(dev, "PCI request regions failed 0x%x\n", err);
+		goto exit;
+	}
+
+	mcs->reg_base = pcim_iomap(pdev, PCI_CFG_REG_BAR_NUM, 0);
+	if (!mcs->reg_base) {
+		dev_err(dev, "mcs: Cannot map CSR memory space, aborting\n");
+		err = -ENOMEM;
+		goto exit;
+	}
+
+	pci_set_drvdata(pdev, mcs);
+	mcs->pdev = pdev;
+	mcs->dev = &pdev->dev;
+
+	if (pdev->subsystem_device == PCI_SUBSYS_DEVID_CN10K_B)
+		mcs->mcs_ops = &cn10kb_mcs_ops;
+	else
+		mcs->mcs_ops = cnf10kb_get_mac_ops();
+
+	/* Set hardware capabilities */
+	mcs->mcs_ops->mcs_set_hw_capabilities(mcs);
+
+	mcs_global_cfg(mcs);
+
+	/* Perform X2P clibration */
+	err = mcs_x2p_calibration(mcs);
+	if (err)
+		goto err_x2p;
+
+	mcs->mcs_id = (pci_resource_start(pdev, PCI_CFG_REG_BAR_NUM) >> 24)
+			& MCS_ID_MASK;
+
+	/* Set mcs tx side resources */
+	err = mcs_alloc_struct_mem(mcs, &mcs->tx);
+	if (err)
+		goto err_x2p;
+
+	/* Set mcs rx side resources */
+	err = mcs_alloc_struct_mem(mcs, &mcs->rx);
+	if (err)
+		goto err_x2p;
+
+	/* per port config */
+	for (lmac = 0; lmac < mcs->hw->lmac_cnt; lmac++)
+		mcs_lmac_init(mcs, lmac);
+
+	/* Parser configuration */
+	mcs->mcs_ops->mcs_parser_cfg(mcs);
+
+	list_add(&mcs->mcs_list, &mcs_list);
+
+	return 0;
+
+err_x2p:
+	/* Enable external bypass */
+	mcs_set_external_bypass(mcs, true);
+exit:
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+	return err;
+}
+
+static void mcs_remove(struct pci_dev *pdev)
+{
+	struct mcs *mcs = pci_get_drvdata(pdev);
+
+	/* Set MCS to external bypass */
+	mcs_set_external_bypass(mcs, true);
+	pci_free_irq_vectors(pdev);
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+}
+
+struct pci_driver mcs_driver = {
+	.name = DRV_NAME,
+	.id_table = mcs_id_table,
+	.probe = mcs_probe,
+	.remove = mcs_remove,
+};