drivers/net/tehuti.h

   1 /*
   2  * Tehuti Networks(R) Network Driver
   3  * Copyright (C) 2007 Tehuti Networks Ltd. All rights reserved
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #ifndef _TEHUTI_H
  12 #define _TEHUTI_H
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/pci.h>
  19 #include <linux/delay.h>
  20 #include <linux/ethtool.h>
  21 #include <linux/mii.h>
  22 #include <linux/crc32.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/in.h>
  25 #include <linux/ip.h>
  26 #include <linux/tcp.h>
  27 #include <linux/sched.h>
  28 #include <linux/tty.h>
  29 #include <linux/if_vlan.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/vmalloc.h>
  32 #include <linux/firmware.h>
  33 #include <asm/byteorder.h>
  34 #include <linux/dma-mapping.h>
  35 #include <linux/slab.h>
  36
  37 /* Compile Time Switches */
  38 /* start */
  39 #define BDX_TSO
  40 #define BDX_LLTX
  41 #define BDX_DELAY_WPTR
  42 /* #define BDX_MSI */
  43 /* end */
  44
  45 #if !defined CONFIG_PCI_MSI
  46 #   undef BDX_MSI
  47 #endif
  48
  49 #define BDX_DEF_MSG_ENABLE      (NETIF_MSG_DRV          | \
  50                                 NETIF_MSG_PROBE        | \
  51                                 NETIF_MSG_LINK)
  52
  53 /* ioctl ops */
  54 #define BDX_OP_READ  1
  55 #define BDX_OP_WRITE 2
  56
  57 /* RX copy break size */
  58 #define BDX_COPYBREAK    257
  59
  60 #define DRIVER_AUTHOR     "Tehuti Networks(R)"
  61 #define BDX_DRV_DESC      "Tehuti Networks(R) Network Driver"
  62 #define BDX_DRV_NAME      "tehuti"
  63 #define BDX_NIC_NAME      "Tehuti 10 Giga TOE SmartNIC"
  64 #define BDX_NIC2PORT_NAME "Tehuti 2-Port 10 Giga TOE SmartNIC"
  65 #define BDX_DRV_VERSION   "7.29.3"
  66
  67 #ifdef BDX_MSI
  68 #    define BDX_MSI_STRING "msi "
  69 #else
  70 #    define BDX_MSI_STRING ""
  71 #endif
  72
  73 /* netdev tx queue len for Luxor. default value is, btw, 1000
  74  * ifcontig eth1 txqueuelen 3000 - to change it at runtime */
  75 #define BDX_NDEV_TXQ_LEN 3000
  76
  77 #define FIFO_SIZE  4096
  78 #define FIFO_EXTRA_SPACE            1024
  79
  80 #if BITS_PER_LONG == 64
  81 #    define H32_64(x)  (u32) ((u64)(x) >> 32)
  82 #    define L32_64(x)  (u32) ((u64)(x) & 0xffffffff)
  83 #elif BITS_PER_LONG == 32
  84 #    define H32_64(x)  0
  85 #    define L32_64(x)  ((u32) (x))
  86 #else                           /* BITS_PER_LONG == ?? */
  87 #    error BITS_PER_LONG is undefined. Must be 64 or 32
  88 #endif                          /* BITS_PER_LONG */
  89
  90 #ifdef __BIG_ENDIAN
  91 #   define CPU_CHIP_SWAP32(x) swab32(x)
  92 #   define CPU_CHIP_SWAP16(x) swab16(x)
  93 #else
  94 #   define CPU_CHIP_SWAP32(x) (x)
  95 #   define CPU_CHIP_SWAP16(x) (x)
  96 #endif
  97
  98 #define READ_REG(pp, reg)         readl(pp->pBdxRegs + reg)
  99 #define WRITE_REG(pp, reg, val)   writel(val, pp->pBdxRegs + reg)
 100
 101 #ifndef NET_IP_ALIGN
 102 #   define NET_IP_ALIGN 2
 103 #endif
 104
 105 #ifndef NETDEV_TX_OK
 106 #   define NETDEV_TX_OK 0
 107 #endif
 108
 109 #define LUXOR_MAX_PORT     2
 110 #define BDX_MAX_RX_DONE    150
 111 #define BDX_TXF_DESC_SZ    16
 112 #define BDX_MAX_TX_LEVEL   (priv->txd_fifo0.m.memsz - 16)
 113 #define BDX_MIN_TX_LEVEL   256
 114 #define BDX_NO_UPD_PACKETS 40
 115
 116 struct pci_nic {
 117         int port_num;
 118         void __iomem *regs;
 119         int irq_type;
 120         struct bdx_priv *priv[LUXOR_MAX_PORT];
 121 };
 122
 123 enum { IRQ_INTX, IRQ_MSI, IRQ_MSIX };
 124
 125 #define PCK_TH_MULT   128
 126 #define INT_COAL_MULT 2
 127
 128 #define BITS_MASK(nbits)                        ((1<<nbits)-1)
 129 #define GET_BITS_SHIFT(x, nbits, nshift)        (((x)>>nshift)&BITS_MASK(nbits))
 130 #define BITS_SHIFT_MASK(nbits, nshift)          (BITS_MASK(nbits)<<nshift)
 131 #define BITS_SHIFT_VAL(x, nbits, nshift)        (((x)&BITS_MASK(nbits))<<nshift)
 132 #define BITS_SHIFT_CLEAR(x, nbits, nshift)      \
 133         ((x)&(~BITS_SHIFT_MASK(nbits, nshift)))
 134
 135 #define GET_INT_COAL(x)                         GET_BITS_SHIFT(x, 15, 0)
 136 #define GET_INT_COAL_RC(x)                      GET_BITS_SHIFT(x, 1, 15)
 137 #define GET_RXF_TH(x)                           GET_BITS_SHIFT(x, 4, 16)
 138 #define GET_PCK_TH(x)                           GET_BITS_SHIFT(x, 4, 20)
 139
 140 #define INT_REG_VAL(coal, coal_rc, rxf_th, pck_th)      \
 141         ((coal)|((coal_rc)<<15)|((rxf_th)<<16)|((pck_th)<<20))
 142
 143 struct fifo {
 144         dma_addr_t da;          /* physical address of fifo (used by HW) */
 145         char *va;               /* virtual address of fifo (used by SW) */
 146         u32 rptr, wptr;         /* cached values of RPTR and WPTR registers,
 147                                    they're 32 bits on both 32 and 64 archs */
 148         u16 reg_CFG0, reg_CFG1;
 149         u16 reg_RPTR, reg_WPTR;
 150         u16 memsz;              /* memory size allocated for fifo */
 151         u16 size_mask;
 152         u16 pktsz;              /* skb packet size to allocate */
 153         u16 rcvno;              /* number of buffers that come from this RXF */
 154 };
 155
 156 struct txf_fifo {
 157         struct fifo m;          /* minimal set of variables used by all fifos */
 158 };
 159
 160 struct txd_fifo {
 161         struct fifo m;          /* minimal set of variables used by all fifos */
 162 };
 163
 164 struct rxf_fifo {
 165         struct fifo m;          /* minimal set of variables used by all fifos */
 166 };
 167
 168 struct rxd_fifo {
 169         struct fifo m;          /* minimal set of variables used by all fifos */
 170 };
 171
 172 struct rx_map {
 173         u64 dma;
 174         struct sk_buff *skb;
 175 };
 176
 177 struct rxdb {
 178         int *stack;
 179         struct rx_map *elems;
 180         int nelem;
 181         int top;
 182 };
 183
 184 union bdx_dma_addr {
 185         dma_addr_t dma;
 186         struct sk_buff *skb;
 187 };
 188
 189 /* Entry in the db.
 190  * if len == 0 addr is dma
 191  * if len != 0 addr is skb */
 192 struct tx_map {
 193         union bdx_dma_addr addr;
 194         int len;
 195 };
 196
 197 /* tx database - implemented as circular fifo buffer*/
 198 struct txdb {
 199         struct tx_map *start;   /* points to the first element */
 200         struct tx_map *end;     /* points just AFTER the last element */
 201         struct tx_map *rptr;    /* points to the next element to read */
 202         struct tx_map *wptr;    /* points to the next element to write */
 203         int size;               /* number of elements in the db */
 204 };
 205
 206 /*Internal stats structure*/
 207 struct bdx_stats {
 208         u64 InUCast;                    /* 0x7200 */
 209         u64 InMCast;                    /* 0x7210 */
 210         u64 InBCast;                    /* 0x7220 */
 211         u64 InPkts;                     /* 0x7230 */
 212         u64 InErrors;                   /* 0x7240 */
 213         u64 InDropped;                  /* 0x7250 */
 214         u64 FrameTooLong;               /* 0x7260 */
 215         u64 FrameSequenceErrors;        /* 0x7270 */
 216         u64 InVLAN;                     /* 0x7280 */
 217         u64 InDroppedDFE;               /* 0x7290 */
 218         u64 InDroppedIntFull;           /* 0x72A0 */
 219         u64 InFrameAlignErrors;         /* 0x72B0 */
 220
 221         /* 0x72C0-0x72E0 RSRV */
 222
 223         u64 OutUCast;                   /* 0x72F0 */
 224         u64 OutMCast;                   /* 0x7300 */
 225         u64 OutBCast;                   /* 0x7310 */
 226         u64 OutPkts;                    /* 0x7320 */
 227
 228         /* 0x7330-0x7360 RSRV */
 229
 230         u64 OutVLAN;                    /* 0x7370 */
 231         u64 InUCastOctects;             /* 0x7380 */
 232         u64 OutUCastOctects;            /* 0x7390 */
 233
 234         /* 0x73A0-0x73B0 RSRV */
 235
 236         u64 InBCastOctects;             /* 0x73C0 */
 237         u64 OutBCastOctects;            /* 0x73D0 */
 238         u64 InOctects;                  /* 0x73E0 */
 239         u64 OutOctects;                 /* 0x73F0 */
 240 };
 241
 242 struct bdx_priv {
 243         void __iomem *pBdxRegs;
 244         struct net_device *ndev;
 245
 246         struct napi_struct napi;
 247
 248         /* RX FIFOs: 1 for data (full) descs, and 2 for free descs */
 249         struct rxd_fifo rxd_fifo0;
 250         struct rxf_fifo rxf_fifo0;
 251         struct rxdb *rxdb;      /* rx dbs to store skb pointers */
 252         int napi_stop;
 253
 254         /* Tx FIFOs: 1 for data desc, 1 for empty (acks) desc */
 255         struct txd_fifo txd_fifo0;
 256         struct txf_fifo txf_fifo0;
 257
 258         struct txdb txdb;
 259         int tx_level;
 260 #ifdef BDX_DELAY_WPTR
 261         int tx_update_mark;
 262         int tx_noupd;
 263 #endif
 264         spinlock_t tx_lock;     /* NETIF_F_LLTX mode */
 265
 266         /* rarely used */
 267         u8 port;
 268         u32 msg_enable;
 269         int stats_flag;
 270         struct bdx_stats hw_stats;
 271         struct pci_dev *pdev;
 272
 273         struct pci_nic *nic;
 274
 275         u8 txd_size;
 276         u8 txf_size;
 277         u8 rxd_size;
 278         u8 rxf_size;
 279         u32 rdintcm;
 280         u32 tdintcm;
 281 };
 282
 283 /* RX FREE descriptor - 64bit*/
 284 struct rxf_desc {
 285         u32 info;               /* Buffer Count + Info - described below */
 286         u32 va_lo;              /* VAdr[31:0] */
 287         u32 va_hi;              /* VAdr[63:32] */
 288         u32 pa_lo;              /* PAdr[31:0] */
 289         u32 pa_hi;              /* PAdr[63:32] */
 290         u32 len;                /* Buffer Length */
 291 };
 292
 293 #define GET_RXD_BC(x)                   GET_BITS_SHIFT((x), 5, 0)
 294 #define GET_RXD_RXFQ(x)                 GET_BITS_SHIFT((x), 2, 8)
 295 #define GET_RXD_TO(x)                   GET_BITS_SHIFT((x), 1, 15)
 296 #define GET_RXD_TYPE(x)                 GET_BITS_SHIFT((x), 4, 16)
 297 #define GET_RXD_ERR(x)                  GET_BITS_SHIFT((x), 6, 21)
 298 #define GET_RXD_RXP(x)                  GET_BITS_SHIFT((x), 1, 27)
 299 #define GET_RXD_PKT_ID(x)               GET_BITS_SHIFT((x), 3, 28)
 300 #define GET_RXD_VTAG(x)                 GET_BITS_SHIFT((x), 1, 31)
 301 #define GET_RXD_VLAN_ID(x)              GET_BITS_SHIFT((x), 12, 0)
 302 #define GET_RXD_VLAN_TCI(x)             GET_BITS_SHIFT((x), 16, 0)
 303 #define GET_RXD_CFI(x)                  GET_BITS_SHIFT((x), 1, 12)
 304 #define GET_RXD_PRIO(x)                 GET_BITS_SHIFT((x), 3, 13)
 305
 306 struct rxd_desc {
 307         u32 rxd_val1;
 308         u16 len;
 309         u16 rxd_vlan;
 310         u32 va_lo;
 311         u32 va_hi;
 312 };
 313
 314 /* PBL describes each virtual buffer to be */
 315 /* transmitted from the host.*/
 316 struct pbl {
 317         u32 pa_lo;
 318         u32 pa_hi;
 319         u32 len;
 320 };
 321
 322 /* First word for TXD descriptor. It means: type = 3 for regular Tx packet,
 323  * hw_csum = 7 for ip+udp+tcp hw checksums */
 324 #define TXD_W1_VAL(bc, checksum, vtag, lgsnd, vlan_id)  \
 325         ((bc) | ((checksum)<<5) | ((vtag)<<8) | \
 326         ((lgsnd)<<9) | (0x30000) | ((vlan_id)<<20))
 327
 328 struct txd_desc {
 329         u32 txd_val1;
 330         u16 mss;
 331         u16 length;
 332         u32 va_lo;
 333         u32 va_hi;
 334         struct pbl pbl[0];      /* Fragments */
 335 } __packed;
 336
 337 /* Register region size */
 338 #define BDX_REGS_SIZE     0x1000
 339
 340 /* Registers from 0x0000-0x00fc were remapped to 0x4000-0x40fc */
 341 #define regTXD_CFG1_0   0x4000
 342 #define regRXF_CFG1_0   0x4010
 343 #define regRXD_CFG1_0   0x4020
 344 #define regTXF_CFG1_0   0x4030
 345 #define regTXD_CFG0_0   0x4040
 346 #define regRXF_CFG0_0   0x4050
 347 #define regRXD_CFG0_0   0x4060
 348 #define regTXF_CFG0_0   0x4070
 349 #define regTXD_WPTR_0   0x4080
 350 #define regRXF_WPTR_0   0x4090
 351 #define regRXD_WPTR_0   0x40A0
 352 #define regTXF_WPTR_0   0x40B0
 353 #define regTXD_RPTR_0   0x40C0
 354 #define regRXF_RPTR_0   0x40D0
 355 #define regRXD_RPTR_0   0x40E0
 356 #define regTXF_RPTR_0   0x40F0
 357 #define regTXF_RPTR_3   0x40FC
 358
 359 /* hardware versioning */
 360 #define  FW_VER         0x5010
 361 #define  SROM_VER       0x5020
 362 #define  FPGA_VER       0x5030
 363 #define  FPGA_SEED      0x5040
 364
 365 /* Registers from 0x0100-0x0150 were remapped to 0x5100-0x5150 */
 366 #define regISR regISR0
 367 #define regISR0          0x5100
 368
 369 #define regIMR regIMR0
 370 #define regIMR0          0x5110
 371
 372 #define regRDINTCM0      0x5120
 373 #define regRDINTCM2      0x5128
 374
 375 #define regTDINTCM0      0x5130
 376
 377 #define regISR_MSK0      0x5140
 378
 379 #define regINIT_SEMAPHORE 0x5170
 380 #define regINIT_STATUS    0x5180
 381
 382 #define regMAC_LNK_STAT  0x0200
 383 #define MAC_LINK_STAT    0x4    /* Link state */
 384
 385 #define regGMAC_RXF_A   0x1240
 386
 387 #define regUNC_MAC0_A   0x1250
 388 #define regUNC_MAC1_A   0x1260
 389 #define regUNC_MAC2_A   0x1270
 390
 391 #define regVLAN_0       0x1800
 392
 393 #define regMAX_FRAME_A  0x12C0
 394
 395 #define regRX_MAC_MCST0    0x1A80
 396 #define regRX_MAC_MCST1    0x1A84
 397 #define MAC_MCST_NUM       15
 398 #define regRX_MCST_HASH0   0x1A00
 399 #define MAC_MCST_HASH_NUM  8
 400
 401 #define regVPC                  0x2300
 402 #define regVIC                  0x2320
 403 #define regVGLB                 0x2340
 404
 405 #define regCLKPLL               0x5000
 406
 407 /*for 10G only*/
 408 #define regREVISION        0x6000
 409 #define regSCRATCH         0x6004
 410 #define regCTRLST          0x6008
 411 #define regMAC_ADDR_0      0x600C
 412 #define regMAC_ADDR_1      0x6010
 413 #define regFRM_LENGTH      0x6014
 414 #define regPAUSE_QUANT     0x6018
 415 #define regRX_FIFO_SECTION 0x601C
 416 #define regTX_FIFO_SECTION 0x6020
 417 #define regRX_FULLNESS     0x6024
 418 #define regTX_FULLNESS     0x6028
 419 #define regHASHTABLE       0x602C
 420 #define regMDIO_ST         0x6030
 421 #define regMDIO_CTL        0x6034
 422 #define regMDIO_DATA       0x6038
 423 #define regMDIO_ADDR       0x603C
 424
 425 #define regRST_PORT        0x7000
 426 #define regDIS_PORT        0x7010
 427 #define regRST_QU          0x7020
 428 #define regDIS_QU          0x7030
 429
 430 #define regCTRLST_TX_ENA   0x0001
 431 #define regCTRLST_RX_ENA   0x0002
 432 #define regCTRLST_PRM_ENA  0x0010
 433 #define regCTRLST_PAD_ENA  0x0020
 434
 435 #define regCTRLST_BASE     (regCTRLST_PAD_ENA|regCTRLST_PRM_ENA)
 436
 437 #define regRX_FLT   0x1400
 438
 439 /* TXD TXF RXF RXD  CONFIG 0x0000 --- 0x007c*/
 440 #define  TX_RX_CFG1_BASE          0xffffffff    /*0-31 */
 441 #define  TX_RX_CFG0_BASE          0xfffff000    /*31:12 */
 442 #define  TX_RX_CFG0_RSVD          0x0ffc        /*11:2 */
 443 #define  TX_RX_CFG0_SIZE          0x0003        /*1:0 */
 444
 445 /*  TXD TXF RXF RXD  WRITE 0x0080 --- 0x00BC */
 446 #define  TXF_WPTR_WR_PTR        0x7ff8  /*14:3 */
 447
 448 /*  TXD TXF RXF RXD  READ  0x00CO --- 0x00FC */
 449 #define  TXF_RPTR_RD_PTR        0x7ff8  /*14:3 */
 450
 451 #define TXF_WPTR_MASK 0x7ff0    /* last 4 bits are dropped
 452                                  * size is rounded to 16 */
 453
 454 /*  regISR 0x0100 */
 455 /*  regIMR 0x0110 */
 456 #define  IMR_INPROG   0x80000000        /*31 */
 457 #define  IR_LNKCHG1   0x10000000        /*28 */
 458 #define  IR_LNKCHG0   0x08000000        /*27 */
 459 #define  IR_GPIO      0x04000000        /*26 */
 460 #define  IR_RFRSH     0x02000000        /*25 */
 461 #define  IR_RSVD      0x01000000        /*24 */
 462 #define  IR_SWI       0x00800000        /*23 */
 463 #define  IR_RX_FREE_3 0x00400000        /*22 */
 464 #define  IR_RX_FREE_2 0x00200000        /*21 */
 465 #define  IR_RX_FREE_1 0x00100000        /*20 */
 466 #define  IR_RX_FREE_0 0x00080000        /*19 */
 467 #define  IR_TX_FREE_3 0x00040000        /*18 */
 468 #define  IR_TX_FREE_2 0x00020000        /*17 */
 469 #define  IR_TX_FREE_1 0x00010000        /*16 */
 470 #define  IR_TX_FREE_0 0x00008000        /*15 */
 471 #define  IR_RX_DESC_3 0x00004000        /*14 */
 472 #define  IR_RX_DESC_2 0x00002000        /*13 */
 473 #define  IR_RX_DESC_1 0x00001000        /*12 */
 474 #define  IR_RX_DESC_0 0x00000800        /*11 */
 475 #define  IR_PSE       0x00000400        /*10 */
 476 #define  IR_TMR3      0x00000200        /*9 */
 477 #define  IR_TMR2      0x00000100        /*8 */
 478 #define  IR_TMR1      0x00000080        /*7 */
 479 #define  IR_TMR0      0x00000040        /*6 */
 480 #define  IR_VNT       0x00000020        /*5 */
 481 #define  IR_RxFL      0x00000010        /*4 */
 482 #define  IR_SDPERR    0x00000008        /*3 */
 483 #define  IR_TR        0x00000004        /*2 */
 484 #define  IR_PCIE_LINK 0x00000002        /*1 */
 485 #define  IR_PCIE_TOUT 0x00000001        /*0 */
 486
 487 #define  IR_EXTRA (IR_RX_FREE_0 | IR_LNKCHG0 | IR_PSE | \
 488     IR_TMR0 | IR_PCIE_LINK | IR_PCIE_TOUT)
 489 #define  IR_RUN (IR_EXTRA | IR_RX_DESC_0 | IR_TX_FREE_0)
 490 #define  IR_ALL 0xfdfffff7
 491
 492 #define  IR_LNKCHG0_ofst        27
 493
 494 #define  GMAC_RX_FILTER_OSEN  0x1000    /* shared OS enable */
 495 #define  GMAC_RX_FILTER_TXFC  0x0400    /* Tx flow control */
 496 #define  GMAC_RX_FILTER_RSV0  0x0200    /* reserved */
 497 #define  GMAC_RX_FILTER_FDA   0x0100    /* filter out direct address */
 498 #define  GMAC_RX_FILTER_AOF   0x0080    /* accept over run */
 499 #define  GMAC_RX_FILTER_ACF   0x0040    /* accept control frames */
 500 #define  GMAC_RX_FILTER_ARUNT 0x0020    /* accept under run */
 501 #define  GMAC_RX_FILTER_ACRC  0x0010    /* accept crc error */
 502 #define  GMAC_RX_FILTER_AM    0x0008    /* accept multicast */
 503 #define  GMAC_RX_FILTER_AB    0x0004    /* accept broadcast */
 504 #define  GMAC_RX_FILTER_PRM   0x0001    /* [0:1] promiscuous mode */
 505
 506 #define  MAX_FRAME_AB_VAL       0x3fff  /* 13:0 */
 507
 508 #define  CLKPLL_PLLLKD          0x0200  /*9 */
 509 #define  CLKPLL_RSTEND          0x0100  /*8 */
 510 #define  CLKPLL_SFTRST          0x0001  /*0 */
 511
 512 #define  CLKPLL_LKD             (CLKPLL_PLLLKD|CLKPLL_RSTEND)
 513
 514 /*
 515  * PCI-E Device Control Register (Offset 0x88)
 516  * Source: Luxor Data Sheet, 7.1.3.3.3
 517  */
 518 #define PCI_DEV_CTRL_REG 0x88
 519 #define GET_DEV_CTRL_MAXPL(x)           GET_BITS_SHIFT(x, 3, 5)
 520 #define GET_DEV_CTRL_MRRS(x)            GET_BITS_SHIFT(x, 3, 12)
 521
 522 /*
 523  * PCI-E Link Status Register (Offset 0x92)
 524  * Source: Luxor Data Sheet, 7.1.3.3.7
 525  */
 526 #define PCI_LINK_STATUS_REG 0x92
 527 #define GET_LINK_STATUS_LANES(x)                GET_BITS_SHIFT(x, 6, 4)
 528
 529 /* Debugging Macros */
 530
 531 #define DBG2(fmt, args...)                                      \
 532         pr_err("%s:%-5d: " fmt, __func__, __LINE__, ## args)
 533
 534 #define BDX_ASSERT(x) BUG_ON(x)
 535
 536 #ifdef DEBUG
 537
 538 #define ENTER                                           \
 539 do {                                                    \
 540         pr_err("%s:%-5d: ENTER\n", __func__, __LINE__); \
 541 } while (0)
 542
 543 #define RET(args...)                                     \
 544 do {                                                     \
 545         pr_err("%s:%-5d: RETURN\n", __func__, __LINE__); \
 546         return args;                                     \
 547 } while (0)
 548
 549 #define DBG(fmt, args...)                                       \
 550         pr_err("%s:%-5d: " fmt, __func__, __LINE__, ## args)
 551 #else
 552 #define ENTER do {  } while (0)
 553 #define RET(args...)   return args
 554 #define DBG(fmt, args...)                       \
 555 do {                                            \
 556         if (0)                                  \
 557                 pr_err(fmt, ##args);            \
 558 } while (0)
 559 #endif
 560
 561 #endif /* _BDX__H */