[dpdk-dev] [PATCH 1/4] drivers/net/enetfec: Introduce NXP ENETFEC driver

[Apeksha Gupta <apeksha.gupta@nxp.com>]

ENET fec (Fast Ethernet Controller) is a network poll mode driver
for NXP SoC imx8mmevk.

This patch add skeleton for enetfec driver with probe and
uintialisation functions

Signed-off-by: Sachin Saxena <sachin.saxena@nxp.com>
Signed-off-by: Apeksha Gupta <apeksha.gupta@nxp.com>
---
 doc/guides/nics/enetfec.rst          | 121 ++++++++++++++++
 doc/guides/nics/features/enetfec.ini |   8 ++
 doc/guides/nics/index.rst            |   1 +
 drivers/net/enetfec/enet_ethdev.c    |  89 ++++++++++++
 drivers/net/enetfec/enet_ethdev.h    | 203 +++++++++++++++++++++++++++
 drivers/net/enetfec/enet_pmd_logs.h  |  31 ++++
 drivers/net/enetfec/meson.build      |  15 ++
 drivers/net/enetfec/version.map      |   3 +
 drivers/net/meson.build              |   1 +
 9 files changed, 472 insertions(+)
 create mode 100644 doc/guides/nics/enetfec.rst
 create mode 100644 doc/guides/nics/features/enetfec.ini
 create mode 100644 drivers/net/enetfec/enet_ethdev.c
 create mode 100644 drivers/net/enetfec/enet_ethdev.h
 create mode 100644 drivers/net/enetfec/enet_pmd_logs.h
 create mode 100644 drivers/net/enetfec/meson.build
 create mode 100644 drivers/net/enetfec/version.map

diff --git a/doc/guides/nics/enetfec.rst b/doc/guides/nics/enetfec.rst
new file mode 100644
index 000000000..10f495fb9
--- /dev/null
+++ b/doc/guides/nics/enetfec.rst
@@ -0,0 +1,121 @@
+.. SPDX-License-Identifier: BSD-3-Clause
+   Copyright 2021 NXP
+
+ENETFEC Poll Mode Driver
+========================
+
+The ENETFEC NIC PMD (**librte_net_enetfec**) provides poll mode driver
+support for the inbuilt NIC found in the ** NXP i.MX 8M Mini** SoC.
+
+More information can be found at NXP Official Website
+<https://www.nxp.com/products/processors-and-microcontrollers/arm-processors/i-mx-applications-processors/i-mx-8-processors/i-mx-8m-mini-arm-cortex-a53-cortex-m4-audio-voice-video:i.MX8MMINI>
+
+ENETFEC
+-------
+
+This section provides an overview of the NXP ENETFEC and how it is
+integrated into the DPDK.
+
+Contents summary
+
+- ENETFEC overview
+- ENETFEC features
+- Supported ENETFEC SoCs
+- Prerequisites
+- Driver compilation and testing
+- Limitations
+
+ENETFEC Overview
+~~~~~~~~~~~~~~~~
+The i.MX 8M Mini Media Applications Processor is built to achieve both high
+performance and low power consumption. ENETFEC is a hardware programmable
+packet forwarding engine to provide high performance Ethernet interface.
+The diagram below shows a system level overview of ENETFEC:
+
+   ====================================================+===============
+   US   +-----------------------------------------+    | Kernel Space
+        |                                         |    |
+        |       ENETFEC Ethernet Driver           |    |
+        +-----------------------------------------+    |
+                          ^   |                        |
+   ENETFEC            RXQ |   | TXQ		       |
+   PMD                    |   |         	       |
+                          |   v      		       |   +----------+
+                     +-------------+                   |   | fec-uio  |
+                     | net_enetfec |                   |   +----------+
+                     +-------------+                   |
+                          ^   |                        |
+                      TXQ |   | RXQ                    |
+                          |   |                        |
+                          |   v                        |
+    ===================================================+===============
+         +----------------------------------------+
+         |                                        |        HW
+         |  i.MX 8M MINI EVK                      |
+         |               +-----+                  |
+         |               | MAC |                  |
+         +---------------+-----+------------------+
+			 | PHY |
+			 +-----+
+
+ENETFEC ethernet driver is traditional DPDK PMD driver running in the userspace.
+The MAC and PHY are the hardware blocks. 'fec-uio' is the uio driver, enetfec PMD
+uses uio interface to interact with kernel for PHY initialisation and for mapping
+the allocated memory of register & BD in kernel with DPDK which gives access to
+non-cacheble memory for BD. net_enetfec is logical ethernet interface, created by
+ENETFEC driver.
+
+- ENETFEC driver registers the device in virtual device driver.
+- RTE framework scans and will invoke the probe function of ENETFEC driver.
+- The probe function will set the basic device registers and also setups BD rings.
+- On packet Rx the respective BD Ring status bit is set which is then used for
+  packet processing.
+- Then Tx is done first followed by Rx via logical interfaces.
+
+ENETFEC Features
+~~~~~~~~~~~~~~~~~
+
+- ARMv8
+
+Supported ENETFEC SoCs
+~~~~~~~~~~~~~~~~~~~~~~
+
+- i.MX 8M Mini
+
+Prerequisites
+~~~~~~~~~~~~~
+
+There are three main pre-requisites for executing ENETfec PMD on a i.MX
+compatible board:
+
+1. **ARM 64 Tool Chain**
+
+   For example, the `*aarch64* Linaro Toolchain <https://releases.linaro.org/components/toolchain/binaries/7.4-2019.02/aarch64-linux-gnu/gcc-linaro-7.4.1-2019.02-x86_64_aarch64-linux-gnu.tar.xz>`_.
+
+2. **Linux Kernel**
+
+  It can be obtained from `NXP's bitbucket: <https://bitbucket.sw.nxp.com/projects/LFAC/repos/linux-nxp/commits?until=refs%2Fheads%2Fnet%2Ffec-uio&merges=include>`_.
+
+3. **Rootfile system**
+
+   Any *aarch64* supporting filesystem can be used. For example,
+   Ubuntu 18.04 LTS (Bionic) or 20.04 LTS(Focal) userland which can be obtained
+   from `here <http://cdimage.ubuntu.com/ubuntu-base/releases/18.04/release/ubuntu-base-18.04.1-base-arm64.tar.gz>`_.
+
+4. The ethernet device will be registered as virtual device, so enetfec has dependency on
+   **rte_bus_vdev** library and it is mandatory to use `--vdev` with value `net_enetfec` to
+   run DPDK application.
+
+Driver compilation and testing
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Follow instructions available in the document
+:ref:`compiling and testing a PMD for a NIC <pmd_build_and_test>`
+to launch **testpmd**
+
+Limitations
+~~~~~~~~~~~
+
+- Multi queue is not supported.
+- Link status is down always.
+- Single ethernet interface.
diff --git a/doc/guides/nics/features/enetfec.ini b/doc/guides/nics/features/enetfec.ini
new file mode 100644
index 000000000..570069798
--- /dev/null
+++ b/doc/guides/nics/features/enetfec.ini
@@ -0,0 +1,8 @@
+;
+; Supported features of the 'enetfec' network poll mode driver.
+;
+; Refer to default.ini for the full list of available PMD features.
+;
+[Features]
+ARMv8                = Y
+Usage doc            = Y
diff --git a/doc/guides/nics/index.rst b/doc/guides/nics/index.rst
index 799697caf..93b68e701 100644
--- a/doc/guides/nics/index.rst
+++ b/doc/guides/nics/index.rst
@@ -25,6 +25,7 @@ Network Interface Controller Drivers
     e1000em
     ena
     enetc
+    enetfec
     enic
     fm10k
     hinic
diff --git a/drivers/net/enetfec/enet_ethdev.c b/drivers/net/enetfec/enet_ethdev.c
new file mode 100644
index 000000000..5fd2dbc2d
--- /dev/null
+++ b/drivers/net/enetfec/enet_ethdev.c
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2021 NXP
+ */
+#include <stdio.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <rte_kvargs.h>
+#include <ethdev_vdev.h>
+#include <rte_bus_vdev.h>
+#include <rte_dev.h>
+#include <rte_ether.h>
+#include "enet_pmd_logs.h"
+#include "enet_ethdev.h"
+
+#define ENETFEC_NAME_PMD        net_enetfec
+#define ENET_VDEV_GEM_ID_ARG    "intf"
+#define ENET_CDEV_INVALID_FD    -1
+
+int enetfec_logtype_pmd;
+
+static int
+enetfec_eth_init(struct rte_eth_dev *dev)
+{
+	rte_eth_dev_probing_finish(dev);
+	return 0;
+}
+
+static int
+pmd_enetfec_probe(struct rte_vdev_device *vdev)
+{
+	struct rte_eth_dev *dev = NULL;
+	struct enetfec_private *fep;
+	const char *name;
+	int rc = -1;
+
+	name = rte_vdev_device_name(vdev);
+	if (name == NULL)
+		return -EINVAL;
+	ENET_PMD_LOG(INFO, "Initializing pmd_fec for %s", name);
+
+	dev = rte_eth_vdev_allocate(vdev, sizeof(*fep));
+	if (dev == NULL)
+		return -ENOMEM;
+
+	/* setup board info structure */
+	fep = dev->data->dev_private;
+	fep->dev = dev;
+	rc = enetfec_eth_init(dev);
+	if (rc)
+		goto failed_init;
+	return 0;
+failed_init:
+	ENET_PMD_ERR("Failed to init");
+	return rc;
+}
+
+static int
+pmd_enetfec_remove(struct rte_vdev_device *vdev)
+{
+	struct rte_eth_dev *eth_dev = NULL;
+
+	/* find the ethdev entry */
+	eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(vdev));
+	if (!eth_dev)
+		return -ENODEV;
+
+	rte_eth_dev_release_port(eth_dev);
+
+	ENET_PMD_INFO("Closing sw device\n");
+	return 0;
+}
+
+static
+struct rte_vdev_driver pmd_enetfec_drv = {
+	.probe = pmd_enetfec_probe,
+	.remove = pmd_enetfec_remove,
+};
+
+RTE_PMD_REGISTER_VDEV(ENETFEC_NAME_PMD, pmd_enetfec_drv);
+RTE_PMD_REGISTER_PARAM_STRING(ENETFEC_NAME_PMD, ENET_VDEV_GEM_ID_ARG "=<int>");
+
+RTE_INIT(enetfec_pmd_init_log)
+{
+	enetfec_logtype_pmd = rte_log_register("pmd.net.enetfec");
+	if (enetfec_logtype_pmd >= 0)
+		rte_log_set_level(enetfec_logtype_pmd, RTE_LOG_NOTICE);
+}
diff --git a/drivers/net/enetfec/enet_ethdev.h b/drivers/net/enetfec/enet_ethdev.h
new file mode 100644
index 000000000..3833a70fc
--- /dev/null
+++ b/drivers/net/enetfec/enet_ethdev.h
@@ -0,0 +1,203 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2021 NXP
+ */
+
+#ifndef __ENET_ETHDEV_H__
+#define __ENET_ETHDEV_H__
+
+#include <compat.h>
+#include <rte_ethdev.h>
+
+/* ENET with AVB IP can support maximum 3 rx and tx queues.
+ */
+#define ENET_MAX_Q	3
+
+#define BD_LEN			49152
+#define ENET_TX_FR_SIZE		2048
+#define MAX_TX_BD_RING_SIZE		512	/* It should be power of 2 */
+#define MAX_RX_BD_RING_SIZE		512
+
+/* full duplex or half duplex */
+#define HALF_DUPLEX             0x00
+#define FULL_DUPLEX             0x01
+#define UNKNOWN_DUPLEX          0xff
+
+#define PKT_MAX_BUF_SIZE        1984
+#define OPT_FRAME_SIZE		(PKT_MAX_BUF_SIZE << 16)
+#define ETH_ALEN		RTE_ETHER_ADDR_LEN
+#define ETH_HLEN		RTE_ETHER_HDR_LEN
+#define VLAN_HLEN		4
+
+
+struct bufdesc {
+	uint16_t	bd_datlen;  /* buffer data length */
+	uint16_t	bd_sc;	    /* buffer control & status */
+	uint32_t	bd_bufaddr; /* buffer address */
+};
+
+struct bufdesc_ex {
+	struct		bufdesc desc;
+	uint32_t	bd_esc;
+	uint32_t	bd_prot;
+	uint32_t	bd_bdu;
+	uint32_t	ts;
+	uint16_t	res0[4];
+};
+
+struct bufdesc_prop {
+	int que_id;
+	/* Addresses of Tx and Rx buffers */
+	struct bufdesc	*base;
+	struct bufdesc	*last;
+	struct bufdesc	*cur;
+	void __iomem	*active_reg_desc;
+	uint64_t	descr_baseaddr_p;
+	unsigned short	ring_size;
+	unsigned char	d_size;
+	unsigned char	d_size_log2;
+};
+
+struct enetfec_priv_tx_q {
+	struct bufdesc_prop	bd;
+	struct rte_mbuf		*tx_mbuf[MAX_TX_BD_RING_SIZE];
+	struct bufdesc		*dirty_tx;
+	struct rte_mempool	*pool;
+	struct enetfec_private	*fep;
+};
+
+struct enetfec_priv_rx_q {
+	struct bufdesc_prop	bd;
+	struct rte_mbuf		*rx_mbuf[MAX_RX_BD_RING_SIZE];
+	struct rte_mempool	*pool;
+	struct enetfec_private	*fep;
+};
+
+/* Buffer descriptors of FEC are used to track the ring buffers. Buffer
+ * descriptor base is x_bd_base. Currently available buffer are x_cur
+ * and x_cur. where x is rx or tx. Current buffer is tracked by dirty_tx
+ * that is sent by the controller.
+ * The tx_cur and dirty_tx are same in completely full and empty
+ * conditions. Actual condition is determine by empty & ready bits.
+ */
+struct enetfec_private {
+	struct rte_eth_dev	*dev;
+	struct rte_eth_stats	stats;
+	struct rte_mempool	*pool;
+
+	struct enetfec_priv_rx_q *rx_queues[ENET_MAX_Q];
+	struct enetfec_priv_tx_q *tx_queues[ENET_MAX_Q];
+	uint16_t	max_rx_queues;
+	uint16_t	max_tx_queues;
+
+	unsigned int	total_tx_ring_size;
+	unsigned int	total_rx_ring_size;
+
+	bool		bufdesc_ex;
+	unsigned int	tx_align;
+	unsigned int	rx_align;
+	int		full_duplex;
+	unsigned int	phy_speed;
+	u_int32_t	quirks;
+	int		flag_csum;
+	int		flag_pause;
+	int		flag_wol;
+	bool		rgmii_txc_delay;
+	bool		rgmii_rxc_delay;
+	int		link;
+	void		*hw_baseaddr_v;
+	uint64_t	hw_baseaddr_p;
+	void		*bd_addr_v;
+	uint64_t	bd_addr_p;
+	uint64_t	bd_addr_p_r[ENET_MAX_Q];
+	uint64_t	bd_addr_p_t[ENET_MAX_Q];
+	void		*dma_baseaddr_r[ENET_MAX_Q];
+	void		*dma_baseaddr_t[ENET_MAX_Q];
+	uint64_t	cbus_size;
+	unsigned int	reg_size;
+	unsigned int	bd_size;
+	int		hw_ts_rx_en;
+	int		hw_ts_tx_en;
+};
+
+#define writel(v, p) ({*(volatile unsigned int *)(p) = (v); })
+#define readl(p) rte_read32(p)
+
+static __always_inline
+void __read_once_size(volatile void *p, void *res, int size)
+{
+	switch (size) {
+	case 1:
+		*(__u8 *)res = *(volatile __u8 *)p;
+		break;
+	case 2:
+		*(__u16 *)res = *(volatile __u16 *)p;
+		break;
+	case 4:
+		*(__u32 *)res = *(volatile __u32 *)p;
+		break;
+	case 8:
+		*(__u64 *)res = *(volatile __u64 *)p;
+		break;
+	default:
+		break;
+	}
+}
+
+#define __READ_ONCE(x)\
+({\
+	union { typeof(x) __val; char __c[1]; } __u;\
+	 __read_once_size(&(x), __u.__c, sizeof(x));\
+	 __u.__val;\
+})
+#ifndef READ_ONCE
+#define READ_ONCE(x) __READ_ONCE(x)
+#endif
+
+static inline struct
+bufdesc *enet_get_nextdesc(struct bufdesc *bdp,
+
+						struct bufdesc_prop *bd)
+{
+	return (bdp >= bd->last) ? bd->base
+			: (struct bufdesc *)(((void *)bdp) + bd->d_size);
+}
+
+static inline struct
+bufdesc *enet_get_prevdesc(struct bufdesc *bdp,
+						struct bufdesc_prop *bd)
+{
+	return (bdp <= bd->base) ? bd->last
+			: (struct bufdesc *)(((void *)bdp) - bd->d_size);
+}
+
+static inline int
+enet_get_bd_index(struct bufdesc *bdp,
+					struct bufdesc_prop *bd)
+{
+	return ((const char *)bdp - (const char *)bd->base) >> bd->d_size_log2;
+}
+
+static inline phys_addr_t enetfec_mem_vtop(uint64_t vaddr)
+{
+	const struct rte_memseg *memseg;
+	memseg = rte_mem_virt2memseg((void *)(uintptr_t)vaddr, NULL);
+	if (memseg)
+		return memseg->iova + RTE_PTR_DIFF(vaddr, memseg->addr);
+	return (size_t)NULL;
+}
+
+static inline int fls64(unsigned long word)
+{
+	return (64 - __builtin_clzl(word)) - 1;
+}
+
+uint16_t enetfec_recv_pkts(void *rxq1, __rte_unused struct rte_mbuf **rx_pkts,
+		uint16_t nb_pkts);
+uint16_t
+enetfec_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts);
+struct bufdesc *enet_get_nextdesc(struct bufdesc *bdp,
+		struct bufdesc_prop *bd);
+int enet_new_rxbdp(struct enetfec_private *fep, struct bufdesc *bdp,
+		struct rte_mbuf *mbuf);
+
+#endif /*__FEC_ETHDEV_H__*/
diff --git a/drivers/net/enetfec/enet_pmd_logs.h b/drivers/net/enetfec/enet_pmd_logs.h
new file mode 100644
index 000000000..ff8daa359
--- /dev/null
+++ b/drivers/net/enetfec/enet_pmd_logs.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2021 NXP
+ */
+
+#ifndef _ENET_LOGS_H_
+#define _ENET_LOGS_H_
+
+extern int enetfec_logtype_pmd;
+
+/* PMD related logs */
+#define ENET_PMD_LOG(level, fmt, args...) \
+	rte_log(RTE_LOG_ ## level, enetfec_logtype_pmd, "fec_net: %s()" \
+		fmt "\n", __func__, ##args)
+
+#define PMD_INIT_FUNC_TRACE() ENET_PMD_LOG(DEBUG, " >>")
+
+#define ENET_PMD_DEBUG(fmt, args...) \
+	ENET_PMD_LOG(DEBUG, fmt, ## args)
+#define ENET_PMD_ERR(fmt, args...) \
+	ENET_PMD_LOG(ERR, fmt, ## args)
+#define ENET_PMD_INFO(fmt, args...) \
+	ENET_PMD_LOG(INFO, fmt, ## args)
+
+#define ENET_PMD_WARN(fmt, args...) \
+	ENET_PMD_LOG(WARNING, fmt, ## args)
+
+/* DP Logs, toggled out at compile time if level lower than current level */
+#define ENET_DP_LOG(level, fmt, args...) \
+	RTE_LOG_DP(level, PMD, fmt, ## args)
+
+#endif /* _ENET_LOGS_H_ */
diff --git a/drivers/net/enetfec/meson.build b/drivers/net/enetfec/meson.build
new file mode 100644
index 000000000..252bf8330
--- /dev/null
+++ b/drivers/net/enetfec/meson.build
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright 2021 NXP
+
+if not is_linux
+	build = false
+	reason = 'only supported on linux'
+endif
+
+deps += ['common_dpaax']
+
+sources = files('enet_ethdev.c')
+
+if cc.has_argument('-Wno-pointer-arith')
+	cflags += '-Wno-pointer-arith'
+endif
diff --git a/drivers/net/enetfec/version.map b/drivers/net/enetfec/version.map
new file mode 100644
index 000000000..6e4fb220a
--- /dev/null
+++ b/drivers/net/enetfec/version.map
@@ -0,0 +1,3 @@
+DPDK_21 {
+        local: *;
+};
diff --git a/drivers/net/meson.build b/drivers/net/meson.build
index c8b5ce298..c1307a3a6 100644
--- a/drivers/net/meson.build
+++ b/drivers/net/meson.build
@@ -18,6 +18,7 @@ drivers = [
         'e1000',
         'ena',
         'enetc',
+	'enetfec',
         'enic',
         'failsafe',
         'fm10k',
-- 
2.17.1