1// SPDX-License-Identifier: GPL-2.0+
   2
   3#include <linux/types.h>
   4#include <linux/clk.h>
   5#include <linux/platform_device.h>
   6#include <linux/pm_runtime.h>
   7#include <linux/acpi.h>
   8#include <linux/of_mdio.h>
   9#include <linux/of_net.h>
  10#include <linux/etherdevice.h>
  11#include <linux/interrupt.h>
  12#include <linux/io.h>
  13#include <linux/netlink.h>
  14#include <linux/bpf.h>
  15#include <linux/bpf_trace.h>
  16
  17#include <net/tcp.h>
  18#include <net/page_pool/helpers.h>
  19#include <net/ip6_checksum.h>
  20
  21#define NETSEC_REG_SOFT_RST			0x104
  22#define NETSEC_REG_COM_INIT			0x120
  23
  24#define NETSEC_REG_TOP_STATUS			0x200
  25#define NETSEC_IRQ_RX				BIT(1)
  26#define NETSEC_IRQ_TX				BIT(0)
  27
  28#define NETSEC_REG_TOP_INTEN			0x204
  29#define NETSEC_REG_INTEN_SET			0x234
  30#define NETSEC_REG_INTEN_CLR			0x238
  31
  32#define NETSEC_REG_NRM_TX_STATUS		0x400
  33#define NETSEC_REG_NRM_TX_INTEN			0x404
  34#define NETSEC_REG_NRM_TX_INTEN_SET		0x428
  35#define NETSEC_REG_NRM_TX_INTEN_CLR		0x42c
  36#define NRM_TX_ST_NTOWNR	BIT(17)
  37#define NRM_TX_ST_TR_ERR	BIT(16)
  38#define NRM_TX_ST_TXDONE	BIT(15)
  39#define NRM_TX_ST_TMREXP	BIT(14)
  40
  41#define NETSEC_REG_NRM_RX_STATUS		0x440
  42#define NETSEC_REG_NRM_RX_INTEN			0x444
  43#define NETSEC_REG_NRM_RX_INTEN_SET		0x468
  44#define NETSEC_REG_NRM_RX_INTEN_CLR		0x46c
  45#define NRM_RX_ST_RC_ERR	BIT(16)
  46#define NRM_RX_ST_PKTCNT	BIT(15)
  47#define NRM_RX_ST_TMREXP	BIT(14)
  48
  49#define NETSEC_REG_PKT_CMD_BUF			0xd0
  50
  51#define NETSEC_REG_CLK_EN			0x100
  52
  53#define NETSEC_REG_PKT_CTRL			0x140
  54
  55#define NETSEC_REG_DMA_TMR_CTRL			0x20c
  56#define NETSEC_REG_F_TAIKI_MC_VER		0x22c
  57#define NETSEC_REG_F_TAIKI_VER			0x230
  58#define NETSEC_REG_DMA_HM_CTRL			0x214
  59#define NETSEC_REG_DMA_MH_CTRL			0x220
  60#define NETSEC_REG_ADDR_DIS_CORE		0x218
  61#define NETSEC_REG_DMAC_HM_CMD_BUF		0x210
  62#define NETSEC_REG_DMAC_MH_CMD_BUF		0x21c
  63
  64#define NETSEC_REG_NRM_TX_PKTCNT		0x410
  65
  66#define NETSEC_REG_NRM_TX_DONE_PKTCNT		0x414
  67#define NETSEC_REG_NRM_TX_DONE_TXINT_PKTCNT	0x418
  68
  69#define NETSEC_REG_NRM_TX_TMR			0x41c
  70
  71#define NETSEC_REG_NRM_RX_PKTCNT		0x454
  72#define NETSEC_REG_NRM_RX_RXINT_PKTCNT		0x458
  73#define NETSEC_REG_NRM_TX_TXINT_TMR		0x420
  74#define NETSEC_REG_NRM_RX_RXINT_TMR		0x460
  75
  76#define NETSEC_REG_NRM_RX_TMR			0x45c
  77
  78#define NETSEC_REG_NRM_TX_DESC_START_UP		0x434
  79#define NETSEC_REG_NRM_TX_DESC_START_LW		0x408
  80#define NETSEC_REG_NRM_RX_DESC_START_UP		0x474
  81#define NETSEC_REG_NRM_RX_DESC_START_LW		0x448
  82
  83#define NETSEC_REG_NRM_TX_CONFIG		0x430
  84#define NETSEC_REG_NRM_RX_CONFIG		0x470
  85
  86#define MAC_REG_STATUS				0x1024
  87#define MAC_REG_DATA				0x11c0
  88#define MAC_REG_CMD				0x11c4
  89#define MAC_REG_FLOW_TH				0x11cc
  90#define MAC_REG_INTF_SEL			0x11d4
  91#define MAC_REG_DESC_INIT			0x11fc
  92#define MAC_REG_DESC_SOFT_RST			0x1204
  93#define NETSEC_REG_MODE_TRANS_COMP_STATUS	0x500
  94
  95#define GMAC_REG_MCR				0x0000
  96#define GMAC_REG_MFFR				0x0004
  97#define GMAC_REG_GAR				0x0010
  98#define GMAC_REG_GDR				0x0014
  99#define GMAC_REG_FCR				0x0018
 100#define GMAC_REG_BMR				0x1000
 101#define GMAC_REG_RDLAR				0x100c
 102#define GMAC_REG_TDLAR				0x1010
 103#define GMAC_REG_OMR				0x1018
 104
 105#define MHZ(n)		((n) * 1000 * 1000)
 106
 107#define NETSEC_TX_SHIFT_OWN_FIELD		31
 108#define NETSEC_TX_SHIFT_LD_FIELD		30
 109#define NETSEC_TX_SHIFT_DRID_FIELD		24
 110#define NETSEC_TX_SHIFT_PT_FIELD		21
 111#define NETSEC_TX_SHIFT_TDRID_FIELD		16
 112#define NETSEC_TX_SHIFT_CC_FIELD		15
 113#define NETSEC_TX_SHIFT_FS_FIELD		9
 114#define NETSEC_TX_LAST				8
 115#define NETSEC_TX_SHIFT_CO			7
 116#define NETSEC_TX_SHIFT_SO			6
 117#define NETSEC_TX_SHIFT_TRS_FIELD		4
 118
 119#define NETSEC_RX_PKT_OWN_FIELD			31
 120#define NETSEC_RX_PKT_LD_FIELD			30
 121#define NETSEC_RX_PKT_SDRID_FIELD		24
 122#define NETSEC_RX_PKT_FR_FIELD			23
 123#define NETSEC_RX_PKT_ER_FIELD			21
 124#define NETSEC_RX_PKT_ERR_FIELD			16
 125#define NETSEC_RX_PKT_TDRID_FIELD		12
 126#define NETSEC_RX_PKT_FS_FIELD			9
 127#define NETSEC_RX_PKT_LS_FIELD			8
 128#define NETSEC_RX_PKT_CO_FIELD			6
 129
 130#define NETSEC_RX_PKT_ERR_MASK			3
 131
 132#define NETSEC_MAX_TX_PKT_LEN			1518
 133#define NETSEC_MAX_TX_JUMBO_PKT_LEN		9018
 134
 135#define NETSEC_RING_GMAC			15
 136#define NETSEC_RING_MAX				2
 137
 138#define NETSEC_TCP_SEG_LEN_MAX			1460
 139#define NETSEC_TCP_JUMBO_SEG_LEN_MAX		8960
 140
 141#define NETSEC_RX_CKSUM_NOTAVAIL		0
 142#define NETSEC_RX_CKSUM_OK			1
 143#define NETSEC_RX_CKSUM_NG			2
 144
 145#define NETSEC_TOP_IRQ_REG_CODE_LOAD_END	BIT(20)
 146#define NETSEC_IRQ_TRANSITION_COMPLETE		BIT(4)
 147
 148#define NETSEC_MODE_TRANS_COMP_IRQ_N2T		BIT(20)
 149#define NETSEC_MODE_TRANS_COMP_IRQ_T2N		BIT(19)
 150
 151#define NETSEC_INT_PKTCNT_MAX			2047
 152
 153#define NETSEC_FLOW_START_TH_MAX		95
 154#define NETSEC_FLOW_STOP_TH_MAX			95
 155#define NETSEC_FLOW_PAUSE_TIME_MIN		5
 156
 157#define NETSEC_CLK_EN_REG_DOM_ALL		0x3f
 158
 159#define NETSEC_PKT_CTRL_REG_MODE_NRM		BIT(28)
 160#define NETSEC_PKT_CTRL_REG_EN_JUMBO		BIT(27)
 161#define NETSEC_PKT_CTRL_REG_LOG_CHKSUM_ER	BIT(3)
 162#define NETSEC_PKT_CTRL_REG_LOG_HD_INCOMPLETE	BIT(2)
 163#define NETSEC_PKT_CTRL_REG_LOG_HD_ER		BIT(1)
 164#define NETSEC_PKT_CTRL_REG_DRP_NO_MATCH	BIT(0)
 165
 166#define NETSEC_CLK_EN_REG_DOM_G			BIT(5)
 167#define NETSEC_CLK_EN_REG_DOM_C			BIT(1)
 168#define NETSEC_CLK_EN_REG_DOM_D			BIT(0)
 169
 170#define NETSEC_COM_INIT_REG_DB			BIT(2)
 171#define NETSEC_COM_INIT_REG_CLS			BIT(1)
 172#define NETSEC_COM_INIT_REG_ALL			(NETSEC_COM_INIT_REG_CLS | \
 173						 NETSEC_COM_INIT_REG_DB)
 174
 175#define NETSEC_SOFT_RST_REG_RESET		0
 176#define NETSEC_SOFT_RST_REG_RUN			BIT(31)
 177
 178#define NETSEC_DMA_CTRL_REG_STOP		1
 179#define MH_CTRL__MODE_TRANS			BIT(20)
 180
 181#define NETSEC_GMAC_CMD_ST_READ			0
 182#define NETSEC_GMAC_CMD_ST_WRITE		BIT(28)
 183#define NETSEC_GMAC_CMD_ST_BUSY			BIT(31)
 184
 185#define NETSEC_GMAC_BMR_REG_COMMON		0x00412080
 186#define NETSEC_GMAC_BMR_REG_RESET		0x00020181
 187#define NETSEC_GMAC_BMR_REG_SWR			0x00000001
 188
 189#define NETSEC_GMAC_OMR_REG_ST			BIT(13)
 190#define NETSEC_GMAC_OMR_REG_SR			BIT(1)
 191
 192#define NETSEC_GMAC_MCR_REG_IBN			BIT(30)
 193#define NETSEC_GMAC_MCR_REG_CST			BIT(25)
 194#define NETSEC_GMAC_MCR_REG_JE			BIT(20)
 195#define NETSEC_MCR_PS				BIT(15)
 196#define NETSEC_GMAC_MCR_REG_FES			BIT(14)
 197#define NETSEC_GMAC_MCR_REG_FULL_DUPLEX_COMMON	0x0000280c
 198#define NETSEC_GMAC_MCR_REG_HALF_DUPLEX_COMMON	0x0001a00c
 199
 200#define NETSEC_FCR_RFE				BIT(2)
 201#define NETSEC_FCR_TFE				BIT(1)
 202
 203#define NETSEC_GMAC_GAR_REG_GW			BIT(1)
 204#define NETSEC_GMAC_GAR_REG_GB			BIT(0)
 205
 206#define NETSEC_GMAC_GAR_REG_SHIFT_PA		11
 207#define NETSEC_GMAC_GAR_REG_SHIFT_GR		6
 208#define GMAC_REG_SHIFT_CR_GAR			2
 209
 210#define NETSEC_GMAC_GAR_REG_CR_25_35_MHZ	2
 211#define NETSEC_GMAC_GAR_REG_CR_35_60_MHZ	3
 212#define NETSEC_GMAC_GAR_REG_CR_60_100_MHZ	0
 213#define NETSEC_GMAC_GAR_REG_CR_100_150_MHZ	1
 214#define NETSEC_GMAC_GAR_REG_CR_150_250_MHZ	4
 215#define NETSEC_GMAC_GAR_REG_CR_250_300_MHZ	5
 216
 217#define NETSEC_GMAC_RDLAR_REG_COMMON		0x18000
 218#define NETSEC_GMAC_TDLAR_REG_COMMON		0x1c000
 219
 220#define NETSEC_REG_NETSEC_VER_F_TAIKI		0x50000
 221
 222#define NETSEC_REG_DESC_RING_CONFIG_CFG_UP	BIT(31)
 223#define NETSEC_REG_DESC_RING_CONFIG_CH_RST	BIT(30)
 224#define NETSEC_REG_DESC_TMR_MODE		4
 225#define NETSEC_REG_DESC_ENDIAN			0
 226
 227#define NETSEC_MAC_DESC_SOFT_RST_SOFT_RST	1
 228#define NETSEC_MAC_DESC_INIT_REG_INIT		1
 229
 230#define NETSEC_EEPROM_MAC_ADDRESS		0x00
 231#define NETSEC_EEPROM_HM_ME_ADDRESS_H		0x08
 232#define NETSEC_EEPROM_HM_ME_ADDRESS_L		0x0C
 233#define NETSEC_EEPROM_HM_ME_SIZE		0x10
 234#define NETSEC_EEPROM_MH_ME_ADDRESS_H		0x14
 235#define NETSEC_EEPROM_MH_ME_ADDRESS_L		0x18
 236#define NETSEC_EEPROM_MH_ME_SIZE		0x1C
 237#define NETSEC_EEPROM_PKT_ME_ADDRESS		0x20
 238#define NETSEC_EEPROM_PKT_ME_SIZE		0x24
 239
 240#define DESC_NUM	256
 241
 242#define NETSEC_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN)
 243#define NETSEC_RXBUF_HEADROOM (max(XDP_PACKET_HEADROOM, NET_SKB_PAD) + \
 244			       NET_IP_ALIGN)
 245#define NETSEC_RX_BUF_NON_DATA (NETSEC_RXBUF_HEADROOM + \
 246				SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
 247#define NETSEC_RX_BUF_SIZE	(PAGE_SIZE - NETSEC_RX_BUF_NON_DATA)
 248
 249#define DESC_SZ	sizeof(struct netsec_de)
 250
 251#define NETSEC_F_NETSEC_VER_MAJOR_NUM(x)	((x) & 0xffff0000)
 252
 253#define NETSEC_XDP_PASS          0
 254#define NETSEC_XDP_CONSUMED      BIT(0)
 255#define NETSEC_XDP_TX            BIT(1)
 256#define NETSEC_XDP_REDIR         BIT(2)
 257
 258enum ring_id {
 259	NETSEC_RING_TX = 0,
 260	NETSEC_RING_RX
 261};
 262
 263enum buf_type {
 264	TYPE_NETSEC_SKB = 0,
 265	TYPE_NETSEC_XDP_TX,
 266	TYPE_NETSEC_XDP_NDO,
 267};
 268
 269struct netsec_desc {
 270	union {
 271		struct sk_buff *skb;
 272		struct xdp_frame *xdpf;
 273	};
 274	dma_addr_t dma_addr;
 275	void *addr;
 276	u16 len;
 277	u8 buf_type;
 278};
 279
 280struct netsec_desc_ring {
 281	dma_addr_t desc_dma;
 282	struct netsec_desc *desc;
 283	void *vaddr;
 284	u16 head, tail;
 285	u16 xdp_xmit; /* netsec_xdp_xmit packets */
 286	struct page_pool *page_pool;
 287	struct xdp_rxq_info xdp_rxq;
 288	spinlock_t lock; /* XDP tx queue locking */
 289};
 290
 291struct netsec_priv {
 292	struct netsec_desc_ring desc_ring[NETSEC_RING_MAX];
 293	struct ethtool_coalesce et_coalesce;
 294	struct bpf_prog *xdp_prog;
 295	spinlock_t reglock; /* protect reg access */
 296	struct napi_struct napi;
 297	phy_interface_t phy_interface;
 298	struct net_device *ndev;
 299	struct device_node *phy_np;
 300	struct phy_device *phydev;
 301	struct mii_bus *mii_bus;
 302	void __iomem *ioaddr;
 303	void __iomem *eeprom_base;
 304	struct device *dev;
 305	struct clk *clk;
 306	u32 msg_enable;
 307	u32 freq;
 308	u32 phy_addr;
 309	bool rx_cksum_offload_flag;
 310};
 311
 312struct netsec_de { /* Netsec Descriptor layout */
 313	u32 attr;
 314	u32 data_buf_addr_up;
 315	u32 data_buf_addr_lw;
 316	u32 buf_len_info;
 317};
 318
 319struct netsec_tx_pkt_ctrl {
 320	u16 tcp_seg_len;
 321	bool tcp_seg_offload_flag;
 322	bool cksum_offload_flag;
 323};
 324
 325struct netsec_rx_pkt_info {
 326	int rx_cksum_result;
 327	int err_code;
 328	bool err_flag;
 329};
 330
 331static void netsec_write(struct netsec_priv *priv, u32 reg_addr, u32 val)
 332{
 333	writel(val, priv->ioaddr + reg_addr);
 334}
 335
 336static u32 netsec_read(struct netsec_priv *priv, u32 reg_addr)
 337{
 338	return readl(priv->ioaddr + reg_addr);
 339}
 340
 341/************* MDIO BUS OPS FOLLOW *************/
 342
 343#define TIMEOUT_SPINS_MAC		1000
 344#define TIMEOUT_SECONDARY_MS_MAC	100
 345
 346static u32 netsec_clk_type(u32 freq)
 347{
 348	if (freq < MHZ(35))
 349		return NETSEC_GMAC_GAR_REG_CR_25_35_MHZ;
 350	if (freq < MHZ(60))
 351		return NETSEC_GMAC_GAR_REG_CR_35_60_MHZ;
 352	if (freq < MHZ(100))
 353		return NETSEC_GMAC_GAR_REG_CR_60_100_MHZ;
 354	if (freq < MHZ(150))
 355		return NETSEC_GMAC_GAR_REG_CR_100_150_MHZ;
 356	if (freq < MHZ(250))
 357		return NETSEC_GMAC_GAR_REG_CR_150_250_MHZ;
 358
 359	return NETSEC_GMAC_GAR_REG_CR_250_300_MHZ;
 360}
 361
 362static int netsec_wait_while_busy(struct netsec_priv *priv, u32 addr, u32 mask)
 363{
 364	u32 timeout = TIMEOUT_SPINS_MAC;
 365
 366	while (--timeout && netsec_read(priv, addr) & mask)
 367		cpu_relax();
 368	if (timeout)
 369		return 0;
 370
 371	timeout = TIMEOUT_SECONDARY_MS_MAC;
 372	while (--timeout && netsec_read(priv, addr) & mask)
 373		usleep_range(1000, 2000);
 374
 375	if (timeout)
 376		return 0;
 377
 378	netdev_WARN(priv->ndev, "%s: timeout\n", __func__);
 379
 380	return -ETIMEDOUT;
 381}
 382
 383static int netsec_mac_write(struct netsec_priv *priv, u32 addr, u32 value)
 384{
 385	netsec_write(priv, MAC_REG_DATA, value);
 386	netsec_write(priv, MAC_REG_CMD, addr | NETSEC_GMAC_CMD_ST_WRITE);
 387	return netsec_wait_while_busy(priv,
 388				      MAC_REG_CMD, NETSEC_GMAC_CMD_ST_BUSY);
 389}
 390
 391static int netsec_mac_read(struct netsec_priv *priv, u32 addr, u32 *read)
 392{
 393	int ret;
 394
 395	netsec_write(priv, MAC_REG_CMD, addr | NETSEC_GMAC_CMD_ST_READ);
 396	ret = netsec_wait_while_busy(priv,
 397				     MAC_REG_CMD, NETSEC_GMAC_CMD_ST_BUSY);
 398	if (ret)
 399		return ret;
 400
 401	*read = netsec_read(priv, MAC_REG_DATA);
 402
 403	return 0;
 404}
 405
 406static int netsec_mac_wait_while_busy(struct netsec_priv *priv,
 407				      u32 addr, u32 mask)
 408{
 409	u32 timeout = TIMEOUT_SPINS_MAC;
 410	int ret, data;
 411
 412	do {
 413		ret = netsec_mac_read(priv, addr, &data);
 414		if (ret)
 415			break;
 416		cpu_relax();
 417	} while (--timeout && (data & mask));
 418
 419	if (timeout)
 420		return 0;
 421
 422	timeout = TIMEOUT_SECONDARY_MS_MAC;
 423	do {
 424		usleep_range(1000, 2000);
 425
 426		ret = netsec_mac_read(priv, addr, &data);
 427		if (ret)
 428			break;
 429		cpu_relax();
 430	} while (--timeout && (data & mask));
 431
 432	if (timeout && !ret)
 433		return 0;
 434
 435	netdev_WARN(priv->ndev, "%s: timeout\n", __func__);
 436
 437	return -ETIMEDOUT;
 438}
 439
 440static int netsec_mac_update_to_phy_state(struct netsec_priv *priv)
 441{
 442	struct phy_device *phydev = priv->ndev->phydev;
 443	u32 value = 0;
 444
 445	value = phydev->duplex ? NETSEC_GMAC_MCR_REG_FULL_DUPLEX_COMMON :
 446				 NETSEC_GMAC_MCR_REG_HALF_DUPLEX_COMMON;
 447
 448	if (phydev->speed != SPEED_1000)
 449		value |= NETSEC_MCR_PS;
 450
 451	if (priv->phy_interface != PHY_INTERFACE_MODE_GMII &&
 452	    phydev->speed == SPEED_100)
 453		value |= NETSEC_GMAC_MCR_REG_FES;
 454
 455	value |= NETSEC_GMAC_MCR_REG_CST | NETSEC_GMAC_MCR_REG_JE;
 456
 457	if (phy_interface_mode_is_rgmii(priv->phy_interface))
 458		value |= NETSEC_GMAC_MCR_REG_IBN;
 459
 460	if (netsec_mac_write(priv, GMAC_REG_MCR, value))
 461		return -ETIMEDOUT;
 462
 463	return 0;
 464}
 465
 466static int netsec_phy_read(struct mii_bus *bus, int phy_addr, int reg_addr);
 467
 468static int netsec_phy_write(struct mii_bus *bus,
 469			    int phy_addr, int reg, u16 val)
 470{
 471	int status;
 472	struct netsec_priv *priv = bus->priv;
 473
 474	if (netsec_mac_write(priv, GMAC_REG_GDR, val))
 475		return -ETIMEDOUT;
 476	if (netsec_mac_write(priv, GMAC_REG_GAR,
 477			     phy_addr << NETSEC_GMAC_GAR_REG_SHIFT_PA |
 478			     reg << NETSEC_GMAC_GAR_REG_SHIFT_GR |
 479			     NETSEC_GMAC_GAR_REG_GW | NETSEC_GMAC_GAR_REG_GB |
 480			     (netsec_clk_type(priv->freq) <<
 481			      GMAC_REG_SHIFT_CR_GAR)))
 482		return -ETIMEDOUT;
 483
 484	status = netsec_mac_wait_while_busy(priv, GMAC_REG_GAR,
 485					    NETSEC_GMAC_GAR_REG_GB);
 486
 487	/* Developerbox implements RTL8211E PHY and there is
 488	 * a compatibility problem with F_GMAC4.
 489	 * RTL8211E expects MDC clock must be kept toggling for several
 490	 * clock cycle with MDIO high before entering the IDLE state.
 491	 * To meet this requirement, netsec driver needs to issue dummy
 492	 * read(e.g. read PHYID1(offset 0x2) register) right after write.
 493	 */
 494	netsec_phy_read(bus, phy_addr, MII_PHYSID1);
 495
 496	return status;
 497}
 498
 499static int netsec_phy_read(struct mii_bus *bus, int phy_addr, int reg_addr)
 500{
 501	struct netsec_priv *priv = bus->priv;
 502	u32 data;
 503	int ret;
 504
 505	if (netsec_mac_write(priv, GMAC_REG_GAR, NETSEC_GMAC_GAR_REG_GB |
 506			     phy_addr << NETSEC_GMAC_GAR_REG_SHIFT_PA |
 507			     reg_addr << NETSEC_GMAC_GAR_REG_SHIFT_GR |
 508			     (netsec_clk_type(priv->freq) <<
 509			      GMAC_REG_SHIFT_CR_GAR)))
 510		return -ETIMEDOUT;
 511
 512	ret = netsec_mac_wait_while_busy(priv, GMAC_REG_GAR,
 513					 NETSEC_GMAC_GAR_REG_GB);
 514	if (ret)
 515		return ret;
 516
 517	ret = netsec_mac_read(priv, GMAC_REG_GDR, &data);
 518	if (ret)
 519		return ret;
 520
 521	return data;
 522}
 523
 524/************* ETHTOOL_OPS FOLLOW *************/
 525
 526static void netsec_et_get_drvinfo(struct net_device *net_device,
 527				  struct ethtool_drvinfo *info)
 528{
 529	strscpy(info->driver, "netsec", sizeof(info->driver));
 530	strscpy(info->bus_info, dev_name(net_device->dev.parent),
 531		sizeof(info->bus_info));
 532}
 533
 534static int netsec_et_get_coalesce(struct net_device *net_device,
 535				  struct ethtool_coalesce *et_coalesce,
 536				  struct kernel_ethtool_coalesce *kernel_coal,
 537				  struct netlink_ext_ack *extack)
 538{
 539	struct netsec_priv *priv = netdev_priv(net_device);
 540
 541	*et_coalesce = priv->et_coalesce;
 542
 543	return 0;
 544}
 545
 546static int netsec_et_set_coalesce(struct net_device *net_device,
 547				  struct ethtool_coalesce *et_coalesce,
 548				  struct kernel_ethtool_coalesce *kernel_coal,
 549				  struct netlink_ext_ack *extack)
 550{
 551	struct netsec_priv *priv = netdev_priv(net_device);
 552
 553	priv->et_coalesce = *et_coalesce;
 554
 555	if (priv->et_coalesce.tx_coalesce_usecs < 50)
 556		priv->et_coalesce.tx_coalesce_usecs = 50;
 557	if (priv->et_coalesce.tx_max_coalesced_frames < 1)
 558		priv->et_coalesce.tx_max_coalesced_frames = 1;
 559
 560	netsec_write(priv, NETSEC_REG_NRM_TX_DONE_TXINT_PKTCNT,
 561		     priv->et_coalesce.tx_max_coalesced_frames);
 562	netsec_write(priv, NETSEC_REG_NRM_TX_TXINT_TMR,
 563		     priv->et_coalesce.tx_coalesce_usecs);
 564	netsec_write(priv, NETSEC_REG_NRM_TX_INTEN_SET, NRM_TX_ST_TXDONE);
 565	netsec_write(priv, NETSEC_REG_NRM_TX_INTEN_SET, NRM_TX_ST_TMREXP);
 566
 567	if (priv->et_coalesce.rx_coalesce_usecs < 50)
 568		priv->et_coalesce.rx_coalesce_usecs = 50;
 569	if (priv->et_coalesce.rx_max_coalesced_frames < 1)
 570		priv->et_coalesce.rx_max_coalesced_frames = 1;
 571
 572	netsec_write(priv, NETSEC_REG_NRM_RX_RXINT_PKTCNT,
 573		     priv->et_coalesce.rx_max_coalesced_frames);
 574	netsec_write(priv, NETSEC_REG_NRM_RX_RXINT_TMR,
 575		     priv->et_coalesce.rx_coalesce_usecs);
 576	netsec_write(priv, NETSEC_REG_NRM_RX_INTEN_SET, NRM_RX_ST_PKTCNT);
 577	netsec_write(priv, NETSEC_REG_NRM_RX_INTEN_SET, NRM_RX_ST_TMREXP);
 578
 579	return 0;
 580}
 581
 582static u32 netsec_et_get_msglevel(struct net_device *dev)
 583{
 584	struct netsec_priv *priv = netdev_priv(dev);
 585
 586	return priv->msg_enable;
 587}
 588
 589static void netsec_et_set_msglevel(struct net_device *dev, u32 datum)
 590{
 591	struct netsec_priv *priv = netdev_priv(dev);
 592
 593	priv->msg_enable = datum;
 594}
 595
 596static const struct ethtool_ops netsec_ethtool_ops = {
 597	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 598				     ETHTOOL_COALESCE_MAX_FRAMES,
 599	.get_drvinfo		= netsec_et_get_drvinfo,
 600	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
 601	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
 602	.get_link		= ethtool_op_get_link,
 603	.get_coalesce		= netsec_et_get_coalesce,
 604	.set_coalesce		= netsec_et_set_coalesce,
 605	.get_msglevel		= netsec_et_get_msglevel,
 606	.set_msglevel		= netsec_et_set_msglevel,
 607};
 608
 609/************* NETDEV_OPS FOLLOW *************/
 610
 611
 612static void netsec_set_rx_de(struct netsec_priv *priv,
 613			     struct netsec_desc_ring *dring, u16 idx,
 614			     const struct netsec_desc *desc)
 615{
 616	struct netsec_de *de = dring->vaddr + DESC_SZ * idx;
 617	u32 attr = (1 << NETSEC_RX_PKT_OWN_FIELD) |
 618		   (1 << NETSEC_RX_PKT_FS_FIELD) |
 619		   (1 << NETSEC_RX_PKT_LS_FIELD);
 620
 621	if (idx == DESC_NUM - 1)
 622		attr |= (1 << NETSEC_RX_PKT_LD_FIELD);
 623
 624	de->data_buf_addr_up = upper_32_bits(desc->dma_addr);
 625	de->data_buf_addr_lw = lower_32_bits(desc->dma_addr);
 626	de->buf_len_info = desc->len;
 627	de->attr = attr;
 628	dma_wmb();
 629
 630	dring->desc[idx].dma_addr = desc->dma_addr;
 631	dring->desc[idx].addr = desc->addr;
 632	dring->desc[idx].len = desc->len;
 633}
 634
 635static bool netsec_clean_tx_dring(struct netsec_priv *priv)
 636{
 637	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_TX];
 638	struct xdp_frame_bulk bq;
 639	struct netsec_de *entry;
 640	int tail = dring->tail;
 641	unsigned int bytes;
 642	int cnt = 0;
 643
 644	spin_lock(&dring->lock);
 645
 646	bytes = 0;
 647	xdp_frame_bulk_init(&bq);
 648	entry = dring->vaddr + DESC_SZ * tail;
 649
 650	rcu_read_lock(); /* need for xdp_return_frame_bulk */
 651
 652	while (!(entry->attr & (1U << NETSEC_TX_SHIFT_OWN_FIELD)) &&
 653	       cnt < DESC_NUM) {
 654		struct netsec_desc *desc;
 655		int eop;
 656
 657		desc = &dring->desc[tail];
 658		eop = (entry->attr >> NETSEC_TX_LAST) & 1;
 659		dma_rmb();
 660
 661		/* if buf_type is either TYPE_NETSEC_SKB or
 662		 * TYPE_NETSEC_XDP_NDO we mapped it
 663		 */
 664		if (desc->buf_type != TYPE_NETSEC_XDP_TX)
 665			dma_unmap_single(priv->dev, desc->dma_addr, desc->len,
 666					 DMA_TO_DEVICE);
 667
 668		if (!eop)
 669			goto next;
 670
 671		if (desc->buf_type == TYPE_NETSEC_SKB) {
 672			bytes += desc->skb->len;
 673			dev_kfree_skb(desc->skb);
 674		} else {
 675			bytes += desc->xdpf->len;
 676			if (desc->buf_type == TYPE_NETSEC_XDP_TX)
 677				xdp_return_frame_rx_napi(desc->xdpf);
 678			else
 679				xdp_return_frame_bulk(desc->xdpf, &bq);
 680		}
 681next:
 682		/* clean up so netsec_uninit_pkt_dring() won't free the skb
 683		 * again
 684		 */
 685		*desc = (struct netsec_desc){};
 686
 687		/* entry->attr is not going to be accessed by the NIC until
 688		 * netsec_set_tx_de() is called. No need for a dma_wmb() here
 689		 */
 690		entry->attr = 1U << NETSEC_TX_SHIFT_OWN_FIELD;
 691		/* move tail ahead */
 692		dring->tail = (tail + 1) % DESC_NUM;
 693
 694		tail = dring->tail;
 695		entry = dring->vaddr + DESC_SZ * tail;
 696		cnt++;
 697	}
 698	xdp_flush_frame_bulk(&bq);
 699
 700	rcu_read_unlock();
 701
 702	spin_unlock(&dring->lock);
 703
 704	if (!cnt)
 705		return false;
 706
 707	/* reading the register clears the irq */
 708	netsec_read(priv, NETSEC_REG_NRM_TX_DONE_PKTCNT);
 709
 710	priv->ndev->stats.tx_packets += cnt;
 711	priv->ndev->stats.tx_bytes += bytes;
 712
 713	netdev_completed_queue(priv->ndev, cnt, bytes);
 714
 715	return true;
 716}
 717
 718static void netsec_process_tx(struct netsec_priv *priv)
 719{
 720	struct net_device *ndev = priv->ndev;
 721	bool cleaned;
 722
 723	cleaned = netsec_clean_tx_dring(priv);
 724
 725	if (cleaned && netif_queue_stopped(ndev)) {
 726		/* Make sure we update the value, anyone stopping the queue
 727		 * after this will read the proper consumer idx
 728		 */
 729		smp_wmb();
 730		netif_wake_queue(ndev);
 731	}
 732}
 733
 734static void *netsec_alloc_rx_data(struct netsec_priv *priv,
 735				  dma_addr_t *dma_handle, u16 *desc_len)
 736
 737{
 738
 739	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
 740	struct page *page;
 741
 742	page = page_pool_dev_alloc_pages(dring->page_pool);
 743	if (!page)
 744		return NULL;
 745
 746	/* We allocate the same buffer length for XDP and non-XDP cases.
 747	 * page_pool API will map the whole page, skip what's needed for
 748	 * network payloads and/or XDP
 749	 */
 750	*dma_handle = page_pool_get_dma_addr(page) + NETSEC_RXBUF_HEADROOM;
 751	/* Make sure the incoming payload fits in the page for XDP and non-XDP
 752	 * cases and reserve enough space for headroom + skb_shared_info
 753	 */
 754	*desc_len = NETSEC_RX_BUF_SIZE;
 755
 756	return page_address(page);
 757}
 758
 759static void netsec_rx_fill(struct netsec_priv *priv, u16 from, u16 num)
 760{
 761	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
 762	u16 idx = from;
 763
 764	while (num) {
 765		netsec_set_rx_de(priv, dring, idx, &dring->desc[idx]);
 766		idx++;
 767		if (idx >= DESC_NUM)
 768			idx = 0;
 769		num--;
 770	}
 771}
 772
 773static void netsec_xdp_ring_tx_db(struct netsec_priv *priv, u16 pkts)
 774{
 775	if (likely(pkts))
 776		netsec_write(priv, NETSEC_REG_NRM_TX_PKTCNT, pkts);
 777}
 778
 779static void netsec_finalize_xdp_rx(struct netsec_priv *priv, u32 xdp_res,
 780				   u16 pkts)
 781{
 782	if (xdp_res & NETSEC_XDP_REDIR)
 783		xdp_do_flush();
 784
 785	if (xdp_res & NETSEC_XDP_TX)
 786		netsec_xdp_ring_tx_db(priv, pkts);
 787}
 788
 789static void netsec_set_tx_de(struct netsec_priv *priv,
 790			     struct netsec_desc_ring *dring,
 791			     const struct netsec_tx_pkt_ctrl *tx_ctrl,
 792			     const struct netsec_desc *desc, void *buf)
 793{
 794	int idx = dring->head;
 795	struct netsec_de *de;
 796	u32 attr;
 797
 798	de = dring->vaddr + (DESC_SZ * idx);
 799
 800	attr = (1 << NETSEC_TX_SHIFT_OWN_FIELD) |
 801	       (1 << NETSEC_TX_SHIFT_PT_FIELD) |
 802	       (NETSEC_RING_GMAC << NETSEC_TX_SHIFT_TDRID_FIELD) |
 803	       (1 << NETSEC_TX_SHIFT_FS_FIELD) |
 804	       (1 << NETSEC_TX_LAST) |
 805	       (tx_ctrl->cksum_offload_flag << NETSEC_TX_SHIFT_CO) |
 806	       (tx_ctrl->tcp_seg_offload_flag << NETSEC_TX_SHIFT_SO) |
 807	       (1 << NETSEC_TX_SHIFT_TRS_FIELD);
 808	if (idx == DESC_NUM - 1)
 809		attr |= (1 << NETSEC_TX_SHIFT_LD_FIELD);
 810
 811	de->data_buf_addr_up = upper_32_bits(desc->dma_addr);
 812	de->data_buf_addr_lw = lower_32_bits(desc->dma_addr);
 813	de->buf_len_info = (tx_ctrl->tcp_seg_len << 16) | desc->len;
 814	de->attr = attr;
 815
 816	dring->desc[idx] = *desc;
 817	if (desc->buf_type == TYPE_NETSEC_SKB)
 818		dring->desc[idx].skb = buf;
 819	else if (desc->buf_type == TYPE_NETSEC_XDP_TX ||
 820		 desc->buf_type == TYPE_NETSEC_XDP_NDO)
 821		dring->desc[idx].xdpf = buf;
 822
 823	/* move head ahead */
 824	dring->head = (dring->head + 1) % DESC_NUM;
 825}
 826
 827/* The current driver only supports 1 Txq, this should run under spin_lock() */
 828static u32 netsec_xdp_queue_one(struct netsec_priv *priv,
 829				struct xdp_frame *xdpf, bool is_ndo)
 830
 831{
 832	struct netsec_desc_ring *tx_ring = &priv->desc_ring[NETSEC_RING_TX];
 833	struct page *page = virt_to_page(xdpf->data);
 834	struct netsec_tx_pkt_ctrl tx_ctrl = {};
 835	struct netsec_desc tx_desc;
 836	dma_addr_t dma_handle;
 837	u16 filled;
 838
 839	if (tx_ring->head >= tx_ring->tail)
 840		filled = tx_ring->head - tx_ring->tail;
 841	else
 842		filled = tx_ring->head + DESC_NUM - tx_ring->tail;
 843
 844	if (DESC_NUM - filled <= 1)
 845		return NETSEC_XDP_CONSUMED;
 846
 847	if (is_ndo) {
 848		/* this is for ndo_xdp_xmit, the buffer needs mapping before
 849		 * sending
 850		 */
 851		dma_handle = dma_map_single(priv->dev, xdpf->data, xdpf->len,
 852					    DMA_TO_DEVICE);
 853		if (dma_mapping_error(priv->dev, dma_handle))
 854			return NETSEC_XDP_CONSUMED;
 855		tx_desc.buf_type = TYPE_NETSEC_XDP_NDO;
 856	} else {
 857		/* This is the device Rx buffer from page_pool. No need to remap
 858		 * just sync and send it
 859		 */
 860		struct netsec_desc_ring *rx_ring =
 861			&priv->desc_ring[NETSEC_RING_RX];
 862		enum dma_data_direction dma_dir =
 863			page_pool_get_dma_dir(rx_ring->page_pool);
 864
 865		dma_handle = page_pool_get_dma_addr(page) + xdpf->headroom +
 866			sizeof(*xdpf);
 867		dma_sync_single_for_device(priv->dev, dma_handle, xdpf->len,
 868					   dma_dir);
 869		tx_desc.buf_type = TYPE_NETSEC_XDP_TX;
 870	}
 871
 872	tx_desc.dma_addr = dma_handle;
 873	tx_desc.addr = xdpf->data;
 874	tx_desc.len = xdpf->len;
 875
 876	netdev_sent_queue(priv->ndev, xdpf->len);
 877	netsec_set_tx_de(priv, tx_ring, &tx_ctrl, &tx_desc, xdpf);
 878
 879	return NETSEC_XDP_TX;
 880}
 881
 882static u32 netsec_xdp_xmit_back(struct netsec_priv *priv, struct xdp_buff *xdp)
 883{
 884	struct netsec_desc_ring *tx_ring = &priv->desc_ring[NETSEC_RING_TX];
 885	struct xdp_frame *xdpf = xdp_convert_buff_to_frame(xdp);
 886	u32 ret;
 887
 888	if (unlikely(!xdpf))
 889		return NETSEC_XDP_CONSUMED;
 890
 891	spin_lock(&tx_ring->lock);
 892	ret = netsec_xdp_queue_one(priv, xdpf, false);
 893	spin_unlock(&tx_ring->lock);
 894
 895	return ret;
 896}
 897
 898static u32 netsec_run_xdp(struct netsec_priv *priv, struct bpf_prog *prog,
 899			  struct xdp_buff *xdp)
 900{
 901	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
 902	unsigned int sync, len = xdp->data_end - xdp->data;
 903	u32 ret = NETSEC_XDP_PASS;
 904	struct page *page;
 905	int err;
 906	u32 act;
 907
 908	act = bpf_prog_run_xdp(prog, xdp);
 909
 910	/* Due xdp_adjust_tail: DMA sync for_device cover max len CPU touch */
 911	sync = xdp->data_end - xdp->data_hard_start - NETSEC_RXBUF_HEADROOM;
 912	sync = max(sync, len);
 913
 914	switch (act) {
 915	case XDP_PASS:
 916		ret = NETSEC_XDP_PASS;
 917		break;
 918	case XDP_TX:
 919		ret = netsec_xdp_xmit_back(priv, xdp);
 920		if (ret != NETSEC_XDP_TX) {
 921			page = virt_to_head_page(xdp->data);
 922			page_pool_put_page(dring->page_pool, page, sync, true);
 923		}
 924		break;
 925	case XDP_REDIRECT:
 926		err = xdp_do_redirect(priv->ndev, xdp, prog);
 927		if (!err) {
 928			ret = NETSEC_XDP_REDIR;
 929		} else {
 930			ret = NETSEC_XDP_CONSUMED;
 931			page = virt_to_head_page(xdp->data);
 932			page_pool_put_page(dring->page_pool, page, sync, true);
 933		}
 934		break;
 935	default:
 936		bpf_warn_invalid_xdp_action(priv->ndev, prog, act);
 937		fallthrough;
 938	case XDP_ABORTED:
 939		trace_xdp_exception(priv->ndev, prog, act);
 940		fallthrough;	/* handle aborts by dropping packet */
 941	case XDP_DROP:
 942		ret = NETSEC_XDP_CONSUMED;
 943		page = virt_to_head_page(xdp->data);
 944		page_pool_put_page(dring->page_pool, page, sync, true);
 945		break;
 946	}
 947
 948	return ret;
 949}
 950
 951static int netsec_process_rx(struct netsec_priv *priv, int budget)
 952{
 953	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
 954	struct net_device *ndev = priv->ndev;
 955	struct netsec_rx_pkt_info rx_info;
 956	enum dma_data_direction dma_dir;
 957	struct bpf_prog *xdp_prog;
 958	struct xdp_buff xdp;
 959	u16 xdp_xmit = 0;
 960	u32 xdp_act = 0;
 961	int done = 0;
 962
 963	xdp_init_buff(&xdp, PAGE_SIZE, &dring->xdp_rxq);
 
 964
 
 965	xdp_prog = READ_ONCE(priv->xdp_prog);
 966	dma_dir = page_pool_get_dma_dir(dring->page_pool);
 967
 968	while (done < budget) {
 969		u16 idx = dring->tail;
 970		struct netsec_de *de = dring->vaddr + (DESC_SZ * idx);
 971		struct netsec_desc *desc = &dring->desc[idx];
 972		struct page *page = virt_to_page(desc->addr);
 973		u32 xdp_result = NETSEC_XDP_PASS;
 974		struct sk_buff *skb = NULL;
 975		u16 pkt_len, desc_len;
 976		dma_addr_t dma_handle;
 977		void *buf_addr;
 978
 979		if (de->attr & (1U << NETSEC_RX_PKT_OWN_FIELD)) {
 980			/* reading the register clears the irq */
 981			netsec_read(priv, NETSEC_REG_NRM_RX_PKTCNT);
 982			break;
 983		}
 984
 985		/* This  barrier is needed to keep us from reading
 986		 * any other fields out of the netsec_de until we have
 987		 * verified the descriptor has been written back
 988		 */
 989		dma_rmb();
 990		done++;
 991
 992		pkt_len = de->buf_len_info >> 16;
 993		rx_info.err_code = (de->attr >> NETSEC_RX_PKT_ERR_FIELD) &
 994			NETSEC_RX_PKT_ERR_MASK;
 995		rx_info.err_flag = (de->attr >> NETSEC_RX_PKT_ER_FIELD) & 1;
 996		if (rx_info.err_flag) {
 997			netif_err(priv, drv, priv->ndev,
 998				  "%s: rx fail err(%d)\n", __func__,
 999				  rx_info.err_code);
1000			ndev->stats.rx_dropped++;
1001			dring->tail = (dring->tail + 1) % DESC_NUM;
1002			/* reuse buffer page frag */
1003			netsec_rx_fill(priv, idx, 1);
1004			continue;
1005		}
1006		rx_info.rx_cksum_result =
1007			(de->attr >> NETSEC_RX_PKT_CO_FIELD) & 3;
1008
1009		/* allocate a fresh buffer and map it to the hardware.
1010		 * This will eventually replace the old buffer in the hardware
1011		 */
1012		buf_addr = netsec_alloc_rx_data(priv, &dma_handle, &desc_len);
1013
1014		if (unlikely(!buf_addr))
1015			break;
1016
1017		dma_sync_single_for_cpu(priv->dev, desc->dma_addr, pkt_len,
1018					dma_dir);
1019		prefetch(desc->addr);
1020
1021		xdp_prepare_buff(&xdp, desc->addr, NETSEC_RXBUF_HEADROOM,
1022				 pkt_len, false);
 
 
1023
1024		if (xdp_prog) {
1025			xdp_result = netsec_run_xdp(priv, xdp_prog, &xdp);
1026			if (xdp_result != NETSEC_XDP_PASS) {
1027				xdp_act |= xdp_result;
1028				if (xdp_result == NETSEC_XDP_TX)
1029					xdp_xmit++;
1030				goto next;
1031			}
1032		}
1033		skb = build_skb(desc->addr, desc->len + NETSEC_RX_BUF_NON_DATA);
1034
1035		if (unlikely(!skb)) {
1036			/* If skb fails recycle_direct will either unmap and
1037			 * free the page or refill the cache depending on the
1038			 * cache state. Since we paid the allocation cost if
1039			 * building an skb fails try to put the page into cache
1040			 */
1041			page_pool_put_page(dring->page_pool, page, pkt_len,
1042					   true);
1043			netif_err(priv, drv, priv->ndev,
1044				  "rx failed to build skb\n");
1045			break;
1046		}
1047		skb_mark_for_recycle(skb);
1048
1049		skb_reserve(skb, xdp.data - xdp.data_hard_start);
1050		skb_put(skb, xdp.data_end - xdp.data);
1051		skb->protocol = eth_type_trans(skb, priv->ndev);
1052
1053		if (priv->rx_cksum_offload_flag &&
1054		    rx_info.rx_cksum_result == NETSEC_RX_CKSUM_OK)
1055			skb->ip_summed = CHECKSUM_UNNECESSARY;
1056
1057next:
1058		if (skb)
1059			napi_gro_receive(&priv->napi, skb);
1060		if (skb || xdp_result) {
1061			ndev->stats.rx_packets++;
1062			ndev->stats.rx_bytes += xdp.data_end - xdp.data;
1063		}
1064
1065		/* Update the descriptor with fresh buffers */
1066		desc->len = desc_len;
1067		desc->dma_addr = dma_handle;
1068		desc->addr = buf_addr;
1069
1070		netsec_rx_fill(priv, idx, 1);
1071		dring->tail = (dring->tail + 1) % DESC_NUM;
1072	}
1073	netsec_finalize_xdp_rx(priv, xdp_act, xdp_xmit);
1074
 
 
1075	return done;
1076}
1077
1078static int netsec_napi_poll(struct napi_struct *napi, int budget)
1079{
1080	struct netsec_priv *priv;
1081	int done;
1082
1083	priv = container_of(napi, struct netsec_priv, napi);
1084
1085	netsec_process_tx(priv);
1086	done = netsec_process_rx(priv, budget);
1087
1088	if (done < budget && napi_complete_done(napi, done)) {
1089		unsigned long flags;
1090
1091		spin_lock_irqsave(&priv->reglock, flags);
1092		netsec_write(priv, NETSEC_REG_INTEN_SET,
1093			     NETSEC_IRQ_RX | NETSEC_IRQ_TX);
1094		spin_unlock_irqrestore(&priv->reglock, flags);
1095	}
1096
1097	return done;
1098}
1099
1100
1101static int netsec_desc_used(struct netsec_desc_ring *dring)
1102{
1103	int used;
1104
1105	if (dring->head >= dring->tail)
1106		used = dring->head - dring->tail;
1107	else
1108		used = dring->head + DESC_NUM - dring->tail;
1109
1110	return used;
1111}
1112
1113static int netsec_check_stop_tx(struct netsec_priv *priv, int used)
1114{
1115	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_TX];
1116
1117	/* keep tail from touching the queue */
1118	if (DESC_NUM - used < 2) {
1119		netif_stop_queue(priv->ndev);
1120
1121		/* Make sure we read the updated value in case
1122		 * descriptors got freed
1123		 */
1124		smp_rmb();
1125
1126		used = netsec_desc_used(dring);
1127		if (DESC_NUM - used < 2)
1128			return NETDEV_TX_BUSY;
1129
1130		netif_wake_queue(priv->ndev);
1131	}
1132
1133	return 0;
1134}
1135
1136static netdev_tx_t netsec_netdev_start_xmit(struct sk_buff *skb,
1137					    struct net_device *ndev)
1138{
1139	struct netsec_priv *priv = netdev_priv(ndev);
1140	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_TX];
1141	struct netsec_tx_pkt_ctrl tx_ctrl = {};
1142	struct netsec_desc tx_desc;
1143	u16 tso_seg_len = 0;
1144	int filled;
1145
1146	spin_lock_bh(&dring->lock);
1147	filled = netsec_desc_used(dring);
1148	if (netsec_check_stop_tx(priv, filled)) {
1149		spin_unlock_bh(&dring->lock);
1150		net_warn_ratelimited("%s %s Tx queue full\n",
1151				     dev_name(priv->dev), ndev->name);
1152		return NETDEV_TX_BUSY;
1153	}
1154
1155	if (skb->ip_summed == CHECKSUM_PARTIAL)
1156		tx_ctrl.cksum_offload_flag = true;
1157
1158	if (skb_is_gso(skb))
1159		tso_seg_len = skb_shinfo(skb)->gso_size;
1160
1161	if (tso_seg_len > 0) {
1162		if (skb->protocol == htons(ETH_P_IP)) {
1163			ip_hdr(skb)->tot_len = 0;
1164			tcp_hdr(skb)->check =
1165				~tcp_v4_check(0, ip_hdr(skb)->saddr,
1166					      ip_hdr(skb)->daddr, 0);
1167		} else {
1168			tcp_v6_gso_csum_prep(skb);
1169		}
1170
1171		tx_ctrl.tcp_seg_offload_flag = true;
1172		tx_ctrl.tcp_seg_len = tso_seg_len;
1173	}
1174
1175	tx_desc.dma_addr = dma_map_single(priv->dev, skb->data,
1176					  skb_headlen(skb), DMA_TO_DEVICE);
1177	if (dma_mapping_error(priv->dev, tx_desc.dma_addr)) {
1178		spin_unlock_bh(&dring->lock);
1179		netif_err(priv, drv, priv->ndev,
1180			  "%s: DMA mapping failed\n", __func__);
1181		ndev->stats.tx_dropped++;
1182		dev_kfree_skb_any(skb);
1183		return NETDEV_TX_OK;
1184	}
1185	tx_desc.addr = skb->data;
1186	tx_desc.len = skb_headlen(skb);
1187	tx_desc.buf_type = TYPE_NETSEC_SKB;
1188
1189	skb_tx_timestamp(skb);
1190	netdev_sent_queue(priv->ndev, skb->len);
1191
1192	netsec_set_tx_de(priv, dring, &tx_ctrl, &tx_desc, skb);
1193	spin_unlock_bh(&dring->lock);
1194	netsec_write(priv, NETSEC_REG_NRM_TX_PKTCNT, 1); /* submit another tx */
1195
1196	return NETDEV_TX_OK;
1197}
1198
1199static void netsec_uninit_pkt_dring(struct netsec_priv *priv, int id)
1200{
1201	struct netsec_desc_ring *dring = &priv->desc_ring[id];
1202	struct netsec_desc *desc;
1203	u16 idx;
1204
1205	if (!dring->vaddr || !dring->desc)
1206		return;
1207	for (idx = 0; idx < DESC_NUM; idx++) {
1208		desc = &dring->desc[idx];
1209		if (!desc->addr)
1210			continue;
1211
1212		if (id == NETSEC_RING_RX) {
1213			struct page *page = virt_to_page(desc->addr);
1214
1215			page_pool_put_full_page(dring->page_pool, page, false);
1216		} else if (id == NETSEC_RING_TX) {
1217			dma_unmap_single(priv->dev, desc->dma_addr, desc->len,
1218					 DMA_TO_DEVICE);
1219			dev_kfree_skb(desc->skb);
1220		}
1221	}
1222
1223	/* Rx is currently using page_pool */
1224	if (id == NETSEC_RING_RX) {
1225		if (xdp_rxq_info_is_reg(&dring->xdp_rxq))
1226			xdp_rxq_info_unreg(&dring->xdp_rxq);
1227		page_pool_destroy(dring->page_pool);
1228	}
1229
1230	memset(dring->desc, 0, sizeof(struct netsec_desc) * DESC_NUM);
1231	memset(dring->vaddr, 0, DESC_SZ * DESC_NUM);
1232
1233	dring->head = 0;
1234	dring->tail = 0;
1235
1236	if (id == NETSEC_RING_TX)
1237		netdev_reset_queue(priv->ndev);
1238}
1239
1240static void netsec_free_dring(struct netsec_priv *priv, int id)
1241{
1242	struct netsec_desc_ring *dring = &priv->desc_ring[id];
1243
1244	if (dring->vaddr) {
1245		dma_free_coherent(priv->dev, DESC_SZ * DESC_NUM,
1246				  dring->vaddr, dring->desc_dma);
1247		dring->vaddr = NULL;
1248	}
1249
1250	kfree(dring->desc);
1251	dring->desc = NULL;
1252}
1253
1254static int netsec_alloc_dring(struct netsec_priv *priv, enum ring_id id)
1255{
1256	struct netsec_desc_ring *dring = &priv->desc_ring[id];
1257
1258	dring->vaddr = dma_alloc_coherent(priv->dev, DESC_SZ * DESC_NUM,
1259					  &dring->desc_dma, GFP_KERNEL);
1260	if (!dring->vaddr)
1261		goto err;
1262
1263	dring->desc = kcalloc(DESC_NUM, sizeof(*dring->desc), GFP_KERNEL);
1264	if (!dring->desc)
1265		goto err;
1266
1267	return 0;
1268err:
1269	netsec_free_dring(priv, id);
1270
1271	return -ENOMEM;
1272}
1273
1274static void netsec_setup_tx_dring(struct netsec_priv *priv)
1275{
1276	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_TX];
1277	int i;
1278
1279	for (i = 0; i < DESC_NUM; i++) {
1280		struct netsec_de *de;
1281
1282		de = dring->vaddr + (DESC_SZ * i);
1283		/* de->attr is not going to be accessed by the NIC
1284		 * until netsec_set_tx_de() is called.
1285		 * No need for a dma_wmb() here
1286		 */
1287		de->attr = 1U << NETSEC_TX_SHIFT_OWN_FIELD;
1288	}
1289}
1290
1291static int netsec_setup_rx_dring(struct netsec_priv *priv)
1292{
1293	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
1294	struct bpf_prog *xdp_prog = READ_ONCE(priv->xdp_prog);
1295	struct page_pool_params pp_params = {
1296		.order = 0,
1297		/* internal DMA mapping in page_pool */
1298		.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV,
1299		.pool_size = DESC_NUM,
1300		.nid = NUMA_NO_NODE,
1301		.dev = priv->dev,
1302		.dma_dir = xdp_prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE,
1303		.offset = NETSEC_RXBUF_HEADROOM,
1304		.max_len = NETSEC_RX_BUF_SIZE,
1305		.napi = &priv->napi,
1306		.netdev = priv->ndev,
1307	};
1308	int i, err;
1309
1310	dring->page_pool = page_pool_create(&pp_params);
1311	if (IS_ERR(dring->page_pool)) {
1312		err = PTR_ERR(dring->page_pool);
1313		dring->page_pool = NULL;
1314		goto err_out;
1315	}
1316
1317	err = xdp_rxq_info_reg(&dring->xdp_rxq, priv->ndev, 0, priv->napi.napi_id);
1318	if (err)
1319		goto err_out;
1320
1321	err = xdp_rxq_info_reg_mem_model(&dring->xdp_rxq, MEM_TYPE_PAGE_POOL,
1322					 dring->page_pool);
1323	if (err)
1324		goto err_out;
1325
1326	for (i = 0; i < DESC_NUM; i++) {
1327		struct netsec_desc *desc = &dring->desc[i];
1328		dma_addr_t dma_handle;
1329		void *buf;
1330		u16 len;
1331
1332		buf = netsec_alloc_rx_data(priv, &dma_handle, &len);
1333
1334		if (!buf) {
1335			err = -ENOMEM;
1336			goto err_out;
1337		}
1338		desc->dma_addr = dma_handle;
1339		desc->addr = buf;
1340		desc->len = len;
1341	}
1342
1343	netsec_rx_fill(priv, 0, DESC_NUM);
1344
1345	return 0;
1346
1347err_out:
1348	netsec_uninit_pkt_dring(priv, NETSEC_RING_RX);
1349	return err;
1350}
1351
1352static int netsec_netdev_load_ucode_region(struct netsec_priv *priv, u32 reg,
1353					   u32 addr_h, u32 addr_l, u32 size)
1354{
1355	u64 base = (u64)addr_h << 32 | addr_l;
1356	void __iomem *ucode;
1357	u32 i;
1358
1359	ucode = ioremap(base, size * sizeof(u32));
1360	if (!ucode)
1361		return -ENOMEM;
1362
1363	for (i = 0; i < size; i++)
1364		netsec_write(priv, reg, readl(ucode + i * 4));
1365
1366	iounmap(ucode);
1367	return 0;
1368}
1369
1370static int netsec_netdev_load_microcode(struct netsec_priv *priv)
1371{
1372	u32 addr_h, addr_l, size;
1373	int err;
1374
1375	addr_h = readl(priv->eeprom_base + NETSEC_EEPROM_HM_ME_ADDRESS_H);
1376	addr_l = readl(priv->eeprom_base + NETSEC_EEPROM_HM_ME_ADDRESS_L);
1377	size = readl(priv->eeprom_base + NETSEC_EEPROM_HM_ME_SIZE);
1378	err = netsec_netdev_load_ucode_region(priv, NETSEC_REG_DMAC_HM_CMD_BUF,
1379					      addr_h, addr_l, size);
1380	if (err)
1381		return err;
1382
1383	addr_h = readl(priv->eeprom_base + NETSEC_EEPROM_MH_ME_ADDRESS_H);
1384	addr_l = readl(priv->eeprom_base + NETSEC_EEPROM_MH_ME_ADDRESS_L);
1385	size = readl(priv->eeprom_base + NETSEC_EEPROM_MH_ME_SIZE);
1386	err = netsec_netdev_load_ucode_region(priv, NETSEC_REG_DMAC_MH_CMD_BUF,
1387					      addr_h, addr_l, size);
1388	if (err)
1389		return err;
1390
1391	addr_h = 0;
1392	addr_l = readl(priv->eeprom_base + NETSEC_EEPROM_PKT_ME_ADDRESS);
1393	size = readl(priv->eeprom_base + NETSEC_EEPROM_PKT_ME_SIZE);
1394	err = netsec_netdev_load_ucode_region(priv, NETSEC_REG_PKT_CMD_BUF,
1395					      addr_h, addr_l, size);
1396	if (err)
1397		return err;
1398
1399	return 0;
1400}
1401
1402static int netsec_reset_hardware(struct netsec_priv *priv,
1403				 bool load_ucode)
1404{
1405	u32 value;
1406	int err;
1407
1408	/* stop DMA engines */
1409	if (!netsec_read(priv, NETSEC_REG_ADDR_DIS_CORE)) {
1410		netsec_write(priv, NETSEC_REG_DMA_HM_CTRL,
1411			     NETSEC_DMA_CTRL_REG_STOP);
1412		netsec_write(priv, NETSEC_REG_DMA_MH_CTRL,
1413			     NETSEC_DMA_CTRL_REG_STOP);
1414
1415		while (netsec_read(priv, NETSEC_REG_DMA_HM_CTRL) &
1416		       NETSEC_DMA_CTRL_REG_STOP)
1417			cpu_relax();
1418
1419		while (netsec_read(priv, NETSEC_REG_DMA_MH_CTRL) &
1420		       NETSEC_DMA_CTRL_REG_STOP)
1421			cpu_relax();
1422	}
1423
1424	netsec_write(priv, NETSEC_REG_SOFT_RST, NETSEC_SOFT_RST_REG_RESET);
1425	netsec_write(priv, NETSEC_REG_SOFT_RST, NETSEC_SOFT_RST_REG_RUN);
1426	netsec_write(priv, NETSEC_REG_COM_INIT, NETSEC_COM_INIT_REG_ALL);
1427
1428	while (netsec_read(priv, NETSEC_REG_COM_INIT) != 0)
1429		cpu_relax();
1430
1431	/* set desc_start addr */
1432	netsec_write(priv, NETSEC_REG_NRM_RX_DESC_START_UP,
1433		     upper_32_bits(priv->desc_ring[NETSEC_RING_RX].desc_dma));
1434	netsec_write(priv, NETSEC_REG_NRM_RX_DESC_START_LW,
1435		     lower_32_bits(priv->desc_ring[NETSEC_RING_RX].desc_dma));
1436
1437	netsec_write(priv, NETSEC_REG_NRM_TX_DESC_START_UP,
1438		     upper_32_bits(priv->desc_ring[NETSEC_RING_TX].desc_dma));
1439	netsec_write(priv, NETSEC_REG_NRM_TX_DESC_START_LW,
1440		     lower_32_bits(priv->desc_ring[NETSEC_RING_TX].desc_dma));
1441
1442	/* set normal tx dring ring config */
1443	netsec_write(priv, NETSEC_REG_NRM_TX_CONFIG,
1444		     1 << NETSEC_REG_DESC_ENDIAN);
1445	netsec_write(priv, NETSEC_REG_NRM_RX_CONFIG,
1446		     1 << NETSEC_REG_DESC_ENDIAN);
1447
1448	if (load_ucode) {
1449		err = netsec_netdev_load_microcode(priv);
1450		if (err) {
1451			netif_err(priv, probe, priv->ndev,
1452				  "%s: failed to load microcode (%d)\n",
1453				  __func__, err);
1454			return err;
1455		}
1456	}
1457
1458	/* start DMA engines */
1459	netsec_write(priv, NETSEC_REG_DMA_TMR_CTRL, priv->freq / 1000000 - 1);
1460	netsec_write(priv, NETSEC_REG_ADDR_DIS_CORE, 0);
1461
1462	usleep_range(1000, 2000);
1463
1464	if (!(netsec_read(priv, NETSEC_REG_TOP_STATUS) &
1465	      NETSEC_TOP_IRQ_REG_CODE_LOAD_END)) {
1466		netif_err(priv, probe, priv->ndev,
1467			  "microengine start failed\n");
1468		return -ENXIO;
1469	}
1470	netsec_write(priv, NETSEC_REG_TOP_STATUS,
1471		     NETSEC_TOP_IRQ_REG_CODE_LOAD_END);
1472
1473	value = NETSEC_PKT_CTRL_REG_MODE_NRM;
1474	if (priv->ndev->mtu > ETH_DATA_LEN)
1475		value |= NETSEC_PKT_CTRL_REG_EN_JUMBO;
1476
1477	/* change to normal mode */
1478	netsec_write(priv, NETSEC_REG_DMA_MH_CTRL, MH_CTRL__MODE_TRANS);
1479	netsec_write(priv, NETSEC_REG_PKT_CTRL, value);
1480
1481	while ((netsec_read(priv, NETSEC_REG_MODE_TRANS_COMP_STATUS) &
1482		NETSEC_MODE_TRANS_COMP_IRQ_T2N) == 0)
1483		cpu_relax();
1484
1485	/* clear any pending EMPTY/ERR irq status */
1486	netsec_write(priv, NETSEC_REG_NRM_TX_STATUS, ~0);
1487
1488	/* Disable TX & RX intr */
1489	netsec_write(priv, NETSEC_REG_INTEN_CLR, ~0);
1490
1491	return 0;
1492}
1493
1494static int netsec_start_gmac(struct netsec_priv *priv)
1495{
1496	struct phy_device *phydev = priv->ndev->phydev;
1497	u32 value = 0;
1498	int ret;
1499
1500	if (phydev->speed != SPEED_1000)
1501		value = (NETSEC_GMAC_MCR_REG_CST |
1502			 NETSEC_GMAC_MCR_REG_HALF_DUPLEX_COMMON);
1503
1504	if (netsec_mac_write(priv, GMAC_REG_MCR, value))
1505		return -ETIMEDOUT;
1506	if (netsec_mac_write(priv, GMAC_REG_BMR,
1507			     NETSEC_GMAC_BMR_REG_RESET))
1508		return -ETIMEDOUT;
1509
1510	/* Wait soft reset */
1511	usleep_range(1000, 5000);
1512
1513	ret = netsec_mac_read(priv, GMAC_REG_BMR, &value);
1514	if (ret)
1515		return ret;
1516	if (value & NETSEC_GMAC_BMR_REG_SWR)
1517		return -EAGAIN;
1518
1519	netsec_write(priv, MAC_REG_DESC_SOFT_RST, 1);
1520	if (netsec_wait_while_busy(priv, MAC_REG_DESC_SOFT_RST, 1))
1521		return -ETIMEDOUT;
1522
1523	netsec_write(priv, MAC_REG_DESC_INIT, 1);
1524	if (netsec_wait_while_busy(priv, MAC_REG_DESC_INIT, 1))
1525		return -ETIMEDOUT;
1526
1527	if (netsec_mac_write(priv, GMAC_REG_BMR,
1528			     NETSEC_GMAC_BMR_REG_COMMON))
1529		return -ETIMEDOUT;
1530	if (netsec_mac_write(priv, GMAC_REG_RDLAR,
1531			     NETSEC_GMAC_RDLAR_REG_COMMON))
1532		return -ETIMEDOUT;
1533	if (netsec_mac_write(priv, GMAC_REG_TDLAR,
1534			     NETSEC_GMAC_TDLAR_REG_COMMON))
1535		return -ETIMEDOUT;
1536	if (netsec_mac_write(priv, GMAC_REG_MFFR, 0x80000001))
1537		return -ETIMEDOUT;
1538
1539	ret = netsec_mac_update_to_phy_state(priv);
1540	if (ret)
1541		return ret;
1542
1543	ret = netsec_mac_read(priv, GMAC_REG_OMR, &value);
1544	if (ret)
1545		return ret;
1546
1547	value |= NETSEC_GMAC_OMR_REG_SR;
1548	value |= NETSEC_GMAC_OMR_REG_ST;
1549
1550	netsec_write(priv, NETSEC_REG_NRM_RX_INTEN_CLR, ~0);
1551	netsec_write(priv, NETSEC_REG_NRM_TX_INTEN_CLR, ~0);
1552
1553	netsec_et_set_coalesce(priv->ndev, &priv->et_coalesce, NULL, NULL);
1554
1555	if (netsec_mac_write(priv, GMAC_REG_OMR, value))
1556		return -ETIMEDOUT;
1557
1558	return 0;
1559}
1560
1561static int netsec_stop_gmac(struct netsec_priv *priv)
1562{
1563	u32 value;
1564	int ret;
1565
1566	ret = netsec_mac_read(priv, GMAC_REG_OMR, &value);
1567	if (ret)
1568		return ret;
1569	value &= ~NETSEC_GMAC_OMR_REG_SR;
1570	value &= ~NETSEC_GMAC_OMR_REG_ST;
1571
1572	/* disable all interrupts */
1573	netsec_write(priv, NETSEC_REG_NRM_RX_INTEN_CLR, ~0);
1574	netsec_write(priv, NETSEC_REG_NRM_TX_INTEN_CLR, ~0);
1575
1576	return netsec_mac_write(priv, GMAC_REG_OMR, value);
1577}
1578
1579static void netsec_phy_adjust_link(struct net_device *ndev)
1580{
1581	struct netsec_priv *priv = netdev_priv(ndev);
1582
1583	if (ndev->phydev->link)
1584		netsec_start_gmac(priv);
1585	else
1586		netsec_stop_gmac(priv);
1587
1588	phy_print_status(ndev->phydev);
1589}
1590
1591static irqreturn_t netsec_irq_handler(int irq, void *dev_id)
1592{
1593	struct netsec_priv *priv = dev_id;
1594	u32 val, status = netsec_read(priv, NETSEC_REG_TOP_STATUS);
1595	unsigned long flags;
1596
1597	/* Disable interrupts */
1598	if (status & NETSEC_IRQ_TX) {
1599		val = netsec_read(priv, NETSEC_REG_NRM_TX_STATUS);
1600		netsec_write(priv, NETSEC_REG_NRM_TX_STATUS, val);
1601	}
1602	if (status & NETSEC_IRQ_RX) {
1603		val = netsec_read(priv, NETSEC_REG_NRM_RX_STATUS);
1604		netsec_write(priv, NETSEC_REG_NRM_RX_STATUS, val);
1605	}
1606
1607	spin_lock_irqsave(&priv->reglock, flags);
1608	netsec_write(priv, NETSEC_REG_INTEN_CLR, NETSEC_IRQ_RX | NETSEC_IRQ_TX);
1609	spin_unlock_irqrestore(&priv->reglock, flags);
1610
1611	napi_schedule(&priv->napi);
1612
1613	return IRQ_HANDLED;
1614}
1615
1616static int netsec_netdev_open(struct net_device *ndev)
1617{
1618	struct netsec_priv *priv = netdev_priv(ndev);
1619	int ret;
1620
1621	pm_runtime_get_sync(priv->dev);
1622
1623	netsec_setup_tx_dring(priv);
1624	ret = netsec_setup_rx_dring(priv);
1625	if (ret) {
1626		netif_err(priv, probe, priv->ndev,
1627			  "%s: fail setup ring\n", __func__);
1628		goto err1;
1629	}
1630
1631	ret = request_irq(priv->ndev->irq, netsec_irq_handler,
1632			  IRQF_SHARED, "netsec", priv);
1633	if (ret) {
1634		netif_err(priv, drv, priv->ndev, "request_irq failed\n");
1635		goto err2;
1636	}
1637
1638	if (dev_of_node(priv->dev)) {
1639		if (!of_phy_connect(priv->ndev, priv->phy_np,
1640				    netsec_phy_adjust_link, 0,
1641				    priv->phy_interface)) {
1642			netif_err(priv, link, priv->ndev, "missing PHY\n");
1643			ret = -ENODEV;
1644			goto err3;
1645		}
1646	} else {
1647		ret = phy_connect_direct(priv->ndev, priv->phydev,
1648					 netsec_phy_adjust_link,
1649					 priv->phy_interface);
1650		if (ret) {
1651			netif_err(priv, link, priv->ndev,
1652				  "phy_connect_direct() failed (%d)\n", ret);
1653			goto err3;
1654		}
1655	}
1656
1657	phy_start(ndev->phydev);
1658
1659	netsec_start_gmac(priv);
1660	napi_enable(&priv->napi);
1661	netif_start_queue(ndev);
1662
1663	/* Enable TX+RX intr. */
1664	netsec_write(priv, NETSEC_REG_INTEN_SET, NETSEC_IRQ_RX | NETSEC_IRQ_TX);
1665
1666	return 0;
1667err3:
1668	free_irq(priv->ndev->irq, priv);
1669err2:
1670	netsec_uninit_pkt_dring(priv, NETSEC_RING_RX);
1671err1:
1672	pm_runtime_put_sync(priv->dev);
1673	return ret;
1674}
1675
1676static int netsec_netdev_stop(struct net_device *ndev)
1677{
1678	int ret;
1679	struct netsec_priv *priv = netdev_priv(ndev);
1680
1681	netif_stop_queue(priv->ndev);
1682	dma_wmb();
1683
1684	napi_disable(&priv->napi);
1685
1686	netsec_write(priv, NETSEC_REG_INTEN_CLR, ~0);
1687	netsec_stop_gmac(priv);
1688
1689	free_irq(priv->ndev->irq, priv);
1690
1691	netsec_uninit_pkt_dring(priv, NETSEC_RING_TX);
1692	netsec_uninit_pkt_dring(priv, NETSEC_RING_RX);
1693
1694	phy_stop(ndev->phydev);
1695	phy_disconnect(ndev->phydev);
1696
1697	ret = netsec_reset_hardware(priv, false);
1698
1699	pm_runtime_put_sync(priv->dev);
1700
1701	return ret;
1702}
1703
1704static int netsec_netdev_init(struct net_device *ndev)
1705{
1706	struct netsec_priv *priv = netdev_priv(ndev);
1707	int ret;
1708	u16 data;
1709
1710	BUILD_BUG_ON_NOT_POWER_OF_2(DESC_NUM);
1711
1712	ret = netsec_alloc_dring(priv, NETSEC_RING_TX);
1713	if (ret)
1714		return ret;
1715
1716	ret = netsec_alloc_dring(priv, NETSEC_RING_RX);
1717	if (ret)
1718		goto err1;
1719
1720	/* set phy power down */
1721	data = netsec_phy_read(priv->mii_bus, priv->phy_addr, MII_BMCR);
1722	netsec_phy_write(priv->mii_bus, priv->phy_addr, MII_BMCR,
1723			 data | BMCR_PDOWN);
1724
1725	ret = netsec_reset_hardware(priv, true);
1726	if (ret)
1727		goto err2;
1728
1729	/* Restore phy power state */
1730	netsec_phy_write(priv->mii_bus, priv->phy_addr, MII_BMCR, data);
1731
1732	spin_lock_init(&priv->desc_ring[NETSEC_RING_TX].lock);
1733	spin_lock_init(&priv->desc_ring[NETSEC_RING_RX].lock);
1734
1735	return 0;
1736err2:
1737	netsec_free_dring(priv, NETSEC_RING_RX);
1738err1:
1739	netsec_free_dring(priv, NETSEC_RING_TX);
1740	return ret;
1741}
1742
1743static void netsec_netdev_uninit(struct net_device *ndev)
1744{
1745	struct netsec_priv *priv = netdev_priv(ndev);
1746
1747	netsec_free_dring(priv, NETSEC_RING_RX);
1748	netsec_free_dring(priv, NETSEC_RING_TX);
1749}
1750
1751static int netsec_netdev_set_features(struct net_device *ndev,
1752				      netdev_features_t features)
1753{
1754	struct netsec_priv *priv = netdev_priv(ndev);
1755
1756	priv->rx_cksum_offload_flag = !!(features & NETIF_F_RXCSUM);
1757
1758	return 0;
1759}
1760
1761static int netsec_xdp_xmit(struct net_device *ndev, int n,
1762			   struct xdp_frame **frames, u32 flags)
1763{
1764	struct netsec_priv *priv = netdev_priv(ndev);
1765	struct netsec_desc_ring *tx_ring = &priv->desc_ring[NETSEC_RING_TX];
1766	int i, nxmit = 0;
 
1767
1768	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
1769		return -EINVAL;
1770
1771	spin_lock(&tx_ring->lock);
1772	for (i = 0; i < n; i++) {
1773		struct xdp_frame *xdpf = frames[i];
1774		int err;
1775
1776		err = netsec_xdp_queue_one(priv, xdpf, true);
1777		if (err != NETSEC_XDP_TX)
1778			break;
1779
1780		tx_ring->xdp_xmit++;
1781		nxmit++;
 
1782	}
1783	spin_unlock(&tx_ring->lock);
1784
1785	if (unlikely(flags & XDP_XMIT_FLUSH)) {
1786		netsec_xdp_ring_tx_db(priv, tx_ring->xdp_xmit);
1787		tx_ring->xdp_xmit = 0;
1788	}
1789
1790	return nxmit;
1791}
1792
1793static int netsec_xdp_setup(struct netsec_priv *priv, struct bpf_prog *prog,
1794			    struct netlink_ext_ack *extack)
1795{
1796	struct net_device *dev = priv->ndev;
1797	struct bpf_prog *old_prog;
1798
1799	/* For now just support only the usual MTU sized frames */
1800	if (prog && dev->mtu > 1500) {
1801		NL_SET_ERR_MSG_MOD(extack, "Jumbo frames not supported on XDP");
1802		return -EOPNOTSUPP;
1803	}
1804
1805	if (netif_running(dev))
1806		netsec_netdev_stop(dev);
1807
1808	/* Detach old prog, if any */
1809	old_prog = xchg(&priv->xdp_prog, prog);
1810	if (old_prog)
1811		bpf_prog_put(old_prog);
1812
1813	if (netif_running(dev))
1814		netsec_netdev_open(dev);
1815
1816	return 0;
1817}
1818
1819static int netsec_xdp(struct net_device *ndev, struct netdev_bpf *xdp)
1820{
1821	struct netsec_priv *priv = netdev_priv(ndev);
1822
1823	switch (xdp->command) {
1824	case XDP_SETUP_PROG:
1825		return netsec_xdp_setup(priv, xdp->prog, xdp->extack);
1826	default:
1827		return -EINVAL;
1828	}
1829}
1830
1831static const struct net_device_ops netsec_netdev_ops = {
1832	.ndo_init		= netsec_netdev_init,
1833	.ndo_uninit		= netsec_netdev_uninit,
1834	.ndo_open		= netsec_netdev_open,
1835	.ndo_stop		= netsec_netdev_stop,
1836	.ndo_start_xmit		= netsec_netdev_start_xmit,
1837	.ndo_set_features	= netsec_netdev_set_features,
1838	.ndo_set_mac_address    = eth_mac_addr,
1839	.ndo_validate_addr	= eth_validate_addr,
1840	.ndo_eth_ioctl		= phy_do_ioctl,
1841	.ndo_xdp_xmit		= netsec_xdp_xmit,
1842	.ndo_bpf		= netsec_xdp,
1843};
1844
1845static int netsec_of_probe(struct platform_device *pdev,
1846			   struct netsec_priv *priv, u32 *phy_addr)
1847{
1848	int err;
1849
1850	err = of_get_phy_mode(pdev->dev.of_node, &priv->phy_interface);
1851	if (err) {
1852		dev_err(&pdev->dev, "missing required property 'phy-mode'\n");
1853		return err;
1854	}
1855
1856	/*
1857	 * SynQuacer is physically configured with TX and RX delays
1858	 * but the standard firmware claimed otherwise for a long
1859	 * time, ignore it.
1860	 */
1861	if (of_machine_is_compatible("socionext,developer-box") &&
1862	    priv->phy_interface != PHY_INTERFACE_MODE_RGMII_ID) {
1863		dev_warn(&pdev->dev, "Outdated firmware reports incorrect PHY mode, overriding\n");
1864		priv->phy_interface = PHY_INTERFACE_MODE_RGMII_ID;
1865	}
1866
1867	priv->phy_np = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
1868	if (!priv->phy_np) {
1869		dev_err(&pdev->dev, "missing required property 'phy-handle'\n");
1870		return -EINVAL;
1871	}
1872
1873	*phy_addr = of_mdio_parse_addr(&pdev->dev, priv->phy_np);
1874
1875	priv->clk = devm_clk_get(&pdev->dev, NULL); /* get by 'phy_ref_clk' */
1876	if (IS_ERR(priv->clk))
1877		return dev_err_probe(&pdev->dev, PTR_ERR(priv->clk),
1878				     "phy_ref_clk not found\n");
 
1879	priv->freq = clk_get_rate(priv->clk);
1880
1881	return 0;
1882}
1883
1884static int netsec_acpi_probe(struct platform_device *pdev,
1885			     struct netsec_priv *priv, u32 *phy_addr)
1886{
1887	int ret;
1888
1889	if (!IS_ENABLED(CONFIG_ACPI))
1890		return -ENODEV;
1891
1892	/* ACPI systems are assumed to configure the PHY in firmware, so
1893	 * there is really no need to discover the PHY mode from the DSDT.
1894	 * Since firmware is known to exist in the field that configures the
1895	 * PHY correctly but passes the wrong mode string in the phy-mode
1896	 * device property, we have no choice but to ignore it.
1897	 */
1898	priv->phy_interface = PHY_INTERFACE_MODE_NA;
1899
1900	ret = device_property_read_u32(&pdev->dev, "phy-channel", phy_addr);
1901	if (ret)
1902		return dev_err_probe(&pdev->dev, ret,
1903				     "missing required property 'phy-channel'\n");
 
 
1904
1905	ret = device_property_read_u32(&pdev->dev,
1906				       "socionext,phy-clock-frequency",
1907				       &priv->freq);
1908	if (ret)
1909		return dev_err_probe(&pdev->dev, ret,
1910				     "missing required property 'socionext,phy-clock-frequency'\n");
1911	return 0;
1912}
1913
1914static void netsec_unregister_mdio(struct netsec_priv *priv)
1915{
1916	struct phy_device *phydev = priv->phydev;
1917
1918	if (!dev_of_node(priv->dev) && phydev) {
1919		phy_device_remove(phydev);
1920		phy_device_free(phydev);
1921	}
1922
1923	mdiobus_unregister(priv->mii_bus);
1924}
1925
1926static int netsec_register_mdio(struct netsec_priv *priv, u32 phy_addr)
1927{
1928	struct mii_bus *bus;
1929	int ret;
1930
1931	bus = devm_mdiobus_alloc(priv->dev);
1932	if (!bus)
1933		return -ENOMEM;
1934
1935	snprintf(bus->id, MII_BUS_ID_SIZE, "%s", dev_name(priv->dev));
1936	bus->priv = priv;
1937	bus->name = "SNI NETSEC MDIO";
1938	bus->read = netsec_phy_read;
1939	bus->write = netsec_phy_write;
1940	bus->parent = priv->dev;
1941	priv->mii_bus = bus;
1942
1943	if (dev_of_node(priv->dev)) {
1944		struct device_node *mdio_node, *parent = dev_of_node(priv->dev);
1945
1946		mdio_node = of_get_child_by_name(parent, "mdio");
1947		if (mdio_node) {
1948			parent = mdio_node;
1949		} else {
1950			/* older f/w doesn't populate the mdio subnode,
1951			 * allow relaxed upgrade of f/w in due time.
1952			 */
1953			dev_info(priv->dev, "Upgrade f/w for mdio subnode!\n");
1954		}
1955
1956		ret = of_mdiobus_register(bus, parent);
1957		of_node_put(mdio_node);
1958
1959		if (ret) {
1960			dev_err(priv->dev, "mdiobus register err(%d)\n", ret);
1961			return ret;
1962		}
1963	} else {
1964		/* Mask out all PHYs from auto probing. */
1965		bus->phy_mask = ~0;
1966		ret = mdiobus_register(bus);
1967		if (ret) {
1968			dev_err(priv->dev, "mdiobus register err(%d)\n", ret);
1969			return ret;
1970		}
1971
1972		priv->phydev = get_phy_device(bus, phy_addr, false);
1973		if (IS_ERR(priv->phydev)) {
1974			ret = PTR_ERR(priv->phydev);
1975			dev_err(priv->dev, "get_phy_device err(%d)\n", ret);
1976			priv->phydev = NULL;
1977			mdiobus_unregister(bus);
1978			return -ENODEV;
1979		}
1980
1981		ret = phy_device_register(priv->phydev);
1982		if (ret) {
1983			phy_device_free(priv->phydev);
1984			mdiobus_unregister(bus);
1985			dev_err(priv->dev,
1986				"phy_device_register err(%d)\n", ret);
1987		}
1988	}
1989
1990	return ret;
1991}
1992
1993static int netsec_probe(struct platform_device *pdev)
1994{
1995	struct resource *mmio_res, *eeprom_res;
 
1996	struct netsec_priv *priv;
1997	u32 hw_ver, phy_addr = 0;
1998	struct net_device *ndev;
1999	int ret;
2000	int irq;
2001
2002	mmio_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2003	if (!mmio_res) {
2004		dev_err(&pdev->dev, "No MMIO resource found.\n");
2005		return -ENODEV;
2006	}
2007
2008	eeprom_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
2009	if (!eeprom_res) {
2010		dev_info(&pdev->dev, "No EEPROM resource found.\n");
2011		return -ENODEV;
2012	}
2013
2014	irq = platform_get_irq(pdev, 0);
2015	if (irq < 0)
2016		return irq;
 
 
2017
2018	ndev = alloc_etherdev(sizeof(*priv));
2019	if (!ndev)
2020		return -ENOMEM;
2021
2022	priv = netdev_priv(ndev);
2023
2024	spin_lock_init(&priv->reglock);
2025	SET_NETDEV_DEV(ndev, &pdev->dev);
2026	platform_set_drvdata(pdev, priv);
2027	ndev->irq = irq;
2028	priv->dev = &pdev->dev;
2029	priv->ndev = ndev;
2030
2031	priv->msg_enable = NETIF_MSG_TX_ERR | NETIF_MSG_HW | NETIF_MSG_DRV |
2032			   NETIF_MSG_LINK | NETIF_MSG_PROBE;
2033
 
 
 
 
 
 
 
2034	priv->ioaddr = devm_ioremap(&pdev->dev, mmio_res->start,
2035				    resource_size(mmio_res));
2036	if (!priv->ioaddr) {
2037		dev_err(&pdev->dev, "devm_ioremap() failed\n");
2038		ret = -ENXIO;
2039		goto free_ndev;
2040	}
2041
2042	priv->eeprom_base = devm_ioremap(&pdev->dev, eeprom_res->start,
2043					 resource_size(eeprom_res));
2044	if (!priv->eeprom_base) {
2045		dev_err(&pdev->dev, "devm_ioremap() failed for EEPROM\n");
2046		ret = -ENXIO;
2047		goto free_ndev;
2048	}
2049
2050	ret = device_get_ethdev_address(&pdev->dev, ndev);
2051	if (ret && priv->eeprom_base) {
 
 
 
 
2052		void __iomem *macp = priv->eeprom_base +
2053					NETSEC_EEPROM_MAC_ADDRESS;
2054		u8 addr[ETH_ALEN];
2055
2056		addr[0] = readb(macp + 3);
2057		addr[1] = readb(macp + 2);
2058		addr[2] = readb(macp + 1);
2059		addr[3] = readb(macp + 0);
2060		addr[4] = readb(macp + 7);
2061		addr[5] = readb(macp + 6);
2062		eth_hw_addr_set(ndev, addr);
2063	}
2064
2065	if (!is_valid_ether_addr(ndev->dev_addr)) {
2066		dev_warn(&pdev->dev, "No MAC address found, using random\n");
2067		eth_hw_addr_random(ndev);
2068	}
2069
2070	if (dev_of_node(&pdev->dev))
2071		ret = netsec_of_probe(pdev, priv, &phy_addr);
2072	else
2073		ret = netsec_acpi_probe(pdev, priv, &phy_addr);
2074	if (ret)
2075		goto free_ndev;
2076
2077	priv->phy_addr = phy_addr;
2078
2079	if (!priv->freq) {
2080		dev_err(&pdev->dev, "missing PHY reference clock frequency\n");
2081		ret = -ENODEV;
2082		goto free_ndev;
2083	}
2084
2085	/* default for throughput */
2086	priv->et_coalesce.rx_coalesce_usecs = 500;
2087	priv->et_coalesce.rx_max_coalesced_frames = 8;
2088	priv->et_coalesce.tx_coalesce_usecs = 500;
2089	priv->et_coalesce.tx_max_coalesced_frames = 8;
2090
2091	ret = device_property_read_u32(&pdev->dev, "max-frame-size",
2092				       &ndev->max_mtu);
2093	if (ret < 0)
2094		ndev->max_mtu = ETH_DATA_LEN;
2095
2096	/* runtime_pm coverage just for probe, open/close also cover it */
2097	pm_runtime_enable(&pdev->dev);
2098	pm_runtime_get_sync(&pdev->dev);
2099
2100	hw_ver = netsec_read(priv, NETSEC_REG_F_TAIKI_VER);
2101	/* this driver only supports F_TAIKI style NETSEC */
2102	if (NETSEC_F_NETSEC_VER_MAJOR_NUM(hw_ver) !=
2103	    NETSEC_F_NETSEC_VER_MAJOR_NUM(NETSEC_REG_NETSEC_VER_F_TAIKI)) {
2104		ret = -ENODEV;
2105		goto pm_disable;
2106	}
2107
2108	dev_info(&pdev->dev, "hardware revision %d.%d\n",
2109		 hw_ver >> 16, hw_ver & 0xffff);
2110
2111	netif_napi_add(ndev, &priv->napi, netsec_napi_poll);
2112
2113	ndev->netdev_ops = &netsec_netdev_ops;
2114	ndev->ethtool_ops = &netsec_ethtool_ops;
2115
2116	ndev->features |= NETIF_F_HIGHDMA | NETIF_F_RXCSUM | NETIF_F_GSO |
2117				NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
2118	ndev->hw_features = ndev->features;
2119
2120	ndev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
2121			     NETDEV_XDP_ACT_NDO_XMIT;
2122
2123	priv->rx_cksum_offload_flag = true;
2124
2125	ret = netsec_register_mdio(priv, phy_addr);
2126	if (ret)
2127		goto unreg_napi;
2128
2129	if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40)))
2130		dev_warn(&pdev->dev, "Failed to set DMA mask\n");
2131
2132	ret = register_netdev(ndev);
2133	if (ret) {
2134		netif_err(priv, probe, ndev, "register_netdev() failed\n");
2135		goto unreg_mii;
2136	}
2137
2138	pm_runtime_put_sync(&pdev->dev);
2139	return 0;
2140
2141unreg_mii:
2142	netsec_unregister_mdio(priv);
2143unreg_napi:
2144	netif_napi_del(&priv->napi);
2145pm_disable:
2146	pm_runtime_put_sync(&pdev->dev);
2147	pm_runtime_disable(&pdev->dev);
2148free_ndev:
2149	free_netdev(ndev);
2150	dev_err(&pdev->dev, "init failed\n");
2151
2152	return ret;
2153}
2154
2155static void netsec_remove(struct platform_device *pdev)
2156{
2157	struct netsec_priv *priv = platform_get_drvdata(pdev);
2158
2159	unregister_netdev(priv->ndev);
2160
2161	netsec_unregister_mdio(priv);
2162
2163	netif_napi_del(&priv->napi);
2164
2165	pm_runtime_disable(&pdev->dev);
2166	free_netdev(priv->ndev);
 
 
2167}
2168
2169#ifdef CONFIG_PM
2170static int netsec_runtime_suspend(struct device *dev)
2171{
2172	struct netsec_priv *priv = dev_get_drvdata(dev);
2173
2174	netsec_write(priv, NETSEC_REG_CLK_EN, 0);
2175
2176	clk_disable_unprepare(priv->clk);
2177
2178	return 0;
2179}
2180
2181static int netsec_runtime_resume(struct device *dev)
2182{
2183	struct netsec_priv *priv = dev_get_drvdata(dev);
2184
2185	clk_prepare_enable(priv->clk);
2186
2187	netsec_write(priv, NETSEC_REG_CLK_EN, NETSEC_CLK_EN_REG_DOM_D |
2188					       NETSEC_CLK_EN_REG_DOM_C |
2189					       NETSEC_CLK_EN_REG_DOM_G);
2190	return 0;
2191}
2192#endif
2193
2194static const struct dev_pm_ops netsec_pm_ops = {
2195	SET_RUNTIME_PM_OPS(netsec_runtime_suspend, netsec_runtime_resume, NULL)
2196};
2197
2198static const struct of_device_id netsec_dt_ids[] = {
2199	{ .compatible = "socionext,synquacer-netsec" },
2200	{ }
2201};
2202MODULE_DEVICE_TABLE(of, netsec_dt_ids);
2203
2204#ifdef CONFIG_ACPI
2205static const struct acpi_device_id netsec_acpi_ids[] = {
2206	{ "SCX0001" },
2207	{ }
2208};
2209MODULE_DEVICE_TABLE(acpi, netsec_acpi_ids);
2210#endif
2211
2212static struct platform_driver netsec_driver = {
2213	.probe	= netsec_probe,
2214	.remove = netsec_remove,
2215	.driver = {
2216		.name = "netsec",
2217		.pm = &netsec_pm_ops,
2218		.of_match_table = netsec_dt_ids,
2219		.acpi_match_table = ACPI_PTR(netsec_acpi_ids),
2220	},
2221};
2222module_platform_driver(netsec_driver);
2223
2224MODULE_AUTHOR("Jassi Brar <jaswinder.singh@linaro.org>");
2225MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
2226MODULE_DESCRIPTION("NETSEC Ethernet driver");
2227MODULE_LICENSE("GPL");