drivers/net/ethernet/chelsio/cxgb4vf/adapter.h

   1 /*
   2  * This file is part of the Chelsio T4 PCI-E SR-IOV Virtual Function Ethernet
   3  * driver for Linux.
   4  *
   5  * Copyright (c) 2009-2010 Chelsio Communications, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 /*
  37  * This file should not be included directly.  Include t4vf_common.h instead.
  38  */
  39
  40 #ifndef __CXGB4VF_ADAPTER_H__
  41 #define __CXGB4VF_ADAPTER_H__
  42
  43 #include <linux/interrupt.h>
  44 #include <linux/pci.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/skbuff.h>
  47 #include <linux/if_ether.h>
  48 #include <linux/netdevice.h>
  49
  50 #include "../cxgb4/t4_hw.h"
  51
  52 /*
  53  * Constants of the implementation.
  54  */
  55 enum {
  56         MAX_NPORTS      = 1,            /* max # of "ports" */
  57         MAX_PORT_QSETS  = 8,            /* max # of Queue Sets / "port" */
  58         MAX_ETH_QSETS   = MAX_NPORTS*MAX_PORT_QSETS,
  59
  60         /*
  61          * MSI-X interrupt index usage.
  62          */
  63         MSIX_FW         = 0,            /* MSI-X index for firmware Q */
  64         MSIX_IQFLINT    = 1,            /* MSI-X index base for Ingress Qs */
  65         MSIX_EXTRAS     = 1,
  66         MSIX_ENTRIES    = MAX_ETH_QSETS + MSIX_EXTRAS,
  67
  68         /*
  69          * The maximum number of Ingress and Egress Queues is determined by
  70          * the maximum number of "Queue Sets" which we support plus any
  71          * ancillary queues.  Each "Queue Set" requires one Ingress Queue
  72          * for RX Packet Ingress Event notifications and two Egress Queues for
  73          * a Free List and an Ethernet TX list.
  74          */
  75         INGQ_EXTRAS     = 2,            /* firmware event queue and */
  76                                         /*   forwarded interrupts */
  77         MAX_INGQ        = MAX_ETH_QSETS+INGQ_EXTRAS,
  78         MAX_EGRQ        = MAX_ETH_QSETS*2,
  79 };
  80
  81 /*
  82  * Forward structure definition references.
  83  */
  84 struct adapter;
  85 struct sge_eth_rxq;
  86 struct sge_rspq;
  87
  88 /*
  89  * Per-"port" information.  This is really per-Virtual Interface information
  90  * but the use of the "port" nomanclature makes it easier to go back and forth
  91  * between the PF and VF drivers ...
  92  */
  93 struct port_info {
  94         struct adapter *adapter;        /* our adapter */
  95         u16 viid;                       /* virtual interface ID */
  96         s16 xact_addr_filt;             /* index of our MAC address filter */
  97         u16 rss_size;                   /* size of VI's RSS table slice */
  98         u8 pidx;                        /* index into adapter port[] */
  99         u8 port_id;                     /* physical port ID */
 100         u8 nqsets;                      /* # of "Queue Sets" */
 101         u8 first_qset;                  /* index of first "Queue Set" */
 102         struct link_config link_cfg;    /* physical port configuration */
 103 };
 104
 105 /*
 106  * Scatter Gather Engine resources for the "adapter".  Our ingress and egress
 107  * queues are organized into "Queue Sets" with one ingress and one egress
 108  * queue per Queue Set.  These Queue Sets are aportionable between the "ports"
 109  * (Virtual Interfaces).  One extra ingress queue is used to receive
 110  * asynchronous messages from the firmware.  Note that the "Queue IDs" that we
 111  * use here are really "Relative Queue IDs" which are returned as part of the
 112  * firmware command to allocate queues.  These queue IDs are relative to the
 113  * absolute Queue ID base of the section of the Queue ID space allocated to
 114  * the PF/VF.
 115  */
 116
 117 /*
 118  * SGE free-list queue state.
 119  */
 120 struct rx_sw_desc;
 121 struct sge_fl {
 122         unsigned int avail;             /* # of available RX buffers */
 123         unsigned int pend_cred;         /* new buffers since last FL DB ring */
 124         unsigned int cidx;              /* consumer index */
 125         unsigned int pidx;              /* producer index */
 126         unsigned long alloc_failed;     /* # of buffer allocation failures */
 127         unsigned long large_alloc_failed;
 128         unsigned long starving;         /* # of times FL was found starving */
 129
 130         /*
 131          * Write-once/infrequently fields.
 132          * -------------------------------
 133          */
 134
 135         unsigned int cntxt_id;          /* SGE relative QID for the free list */
 136         unsigned int abs_id;            /* SGE absolute QID for the free list */
 137         unsigned int size;              /* capacity of free list */
 138         struct rx_sw_desc *sdesc;       /* address of SW RX descriptor ring */
 139         __be64 *desc;                   /* address of HW RX descriptor ring */
 140         dma_addr_t addr;                /* PCI bus address of hardware ring */
 141 };
 142
 143 /*
 144  * An ingress packet gather list.
 145  */
 146 struct pkt_gl {
 147         skb_frag_t frags[MAX_SKB_FRAGS];
 148         void *va;                       /* virtual address of first byte */
 149         unsigned int nfrags;            /* # of fragments */
 150         unsigned int tot_len;           /* total length of fragments */
 151 };
 152
 153 typedef int (*rspq_handler_t)(struct sge_rspq *, const __be64 *,
 154                               const struct pkt_gl *);
 155
 156 /*
 157  * State for an SGE Response Queue.
 158  */
 159 struct sge_rspq {
 160         struct napi_struct napi;        /* NAPI scheduling control */
 161         const __be64 *cur_desc;         /* current descriptor in queue */
 162         unsigned int cidx;              /* consumer index */
 163         u8 gen;                         /* current generation bit */
 164         u8 next_intr_params;            /* holdoff params for next interrupt */
 165         int offset;                     /* offset into current FL buffer */
 166
 167         unsigned int unhandled_irqs;    /* bogus interrupts */
 168
 169         /*
 170          * Write-once/infrequently fields.
 171          * -------------------------------
 172          */
 173
 174         u8 intr_params;                 /* interrupt holdoff parameters */
 175         u8 pktcnt_idx;                  /* interrupt packet threshold */
 176         u8 idx;                         /* queue index within its group */
 177         u16 cntxt_id;                   /* SGE rel QID for the response Q */
 178         u16 abs_id;                     /* SGE abs QID for the response Q */
 179         __be64 *desc;                   /* address of hardware response ring */
 180         dma_addr_t phys_addr;           /* PCI bus address of ring */
 181         unsigned int iqe_len;           /* entry size */
 182         unsigned int size;              /* capcity of response Q */
 183         struct adapter *adapter;        /* our adapter */
 184         struct net_device *netdev;      /* associated net device */
 185         rspq_handler_t handler;         /* the handler for this response Q */
 186 };
 187
 188 /*
 189  * Ethernet queue statistics
 190  */
 191 struct sge_eth_stats {
 192         unsigned long pkts;             /* # of ethernet packets */
 193         unsigned long lro_pkts;         /* # of LRO super packets */
 194         unsigned long lro_merged;       /* # of wire packets merged by LRO */
 195         unsigned long rx_cso;           /* # of Rx checksum offloads */
 196         unsigned long vlan_ex;          /* # of Rx VLAN extractions */
 197         unsigned long rx_drops;         /* # of packets dropped due to no mem */
 198 };
 199
 200 /*
 201  * State for an Ethernet Receive Queue.
 202  */
 203 struct sge_eth_rxq {
 204         struct sge_rspq rspq;           /* Response Queue */
 205         struct sge_fl fl;               /* Free List */
 206         struct sge_eth_stats stats;     /* receive statistics */
 207 };
 208
 209 /*
 210  * SGE Transmit Queue state.  This contains all of the resources associated
 211  * with the hardware status of a TX Queue which is a circular ring of hardware
 212  * TX Descriptors.  For convenience, it also contains a pointer to a parallel
 213  * "Software Descriptor" array but we don't know anything about it here other
 214  * than its type name.
 215  */
 216 struct tx_desc {
 217         /*
 218          * Egress Queues are measured in units of SGE_EQ_IDXSIZE by the
 219          * hardware: Sizes, Producer and Consumer indices, etc.
 220          */
 221         __be64 flit[SGE_EQ_IDXSIZE/sizeof(__be64)];
 222 };
 223 struct tx_sw_desc;
 224 struct sge_txq {
 225         unsigned int in_use;            /* # of in-use TX descriptors */
 226         unsigned int size;              /* # of descriptors */
 227         unsigned int cidx;              /* SW consumer index */
 228         unsigned int pidx;              /* producer index */
 229         unsigned long stops;            /* # of times queue has been stopped */
 230         unsigned long restarts;         /* # of queue restarts */
 231
 232         /*
 233          * Write-once/infrequently fields.
 234          * -------------------------------
 235          */
 236
 237         unsigned int cntxt_id;          /* SGE relative QID for the TX Q */
 238         unsigned int abs_id;            /* SGE absolute QID for the TX Q */
 239         struct tx_desc *desc;           /* address of HW TX descriptor ring */
 240         struct tx_sw_desc *sdesc;       /* address of SW TX descriptor ring */
 241         struct sge_qstat *stat;         /* queue status entry */
 242         dma_addr_t phys_addr;           /* PCI bus address of hardware ring */
 243 };
 244
 245 /*
 246  * State for an Ethernet Transmit Queue.
 247  */
 248 struct sge_eth_txq {
 249         struct sge_txq q;               /* SGE TX Queue */
 250         struct netdev_queue *txq;       /* associated netdev TX queue */
 251         unsigned long tso;              /* # of TSO requests */
 252         unsigned long tx_cso;           /* # of TX checksum offloads */
 253         unsigned long vlan_ins;         /* # of TX VLAN insertions */
 254         unsigned long mapping_err;      /* # of I/O MMU packet mapping errors */
 255 };
 256
 257 /*
 258  * The complete set of Scatter/Gather Engine resources.
 259  */
 260 struct sge {
 261         /*
 262          * Our "Queue Sets" ...
 263          */
 264         struct sge_eth_txq ethtxq[MAX_ETH_QSETS];
 265         struct sge_eth_rxq ethrxq[MAX_ETH_QSETS];
 266
 267         /*
 268          * Extra ingress queues for asynchronous firmware events and
 269          * forwarded interrupts (when in MSI mode).
 270          */
 271         struct sge_rspq fw_evtq ____cacheline_aligned_in_smp;
 272
 273         struct sge_rspq intrq ____cacheline_aligned_in_smp;
 274         spinlock_t intrq_lock;
 275
 276         /*
 277          * State for managing "starving Free Lists" -- Free Lists which have
 278          * fallen below a certain threshold of buffers available to the
 279          * hardware and attempts to refill them up to that threshold have
 280          * failed.  We have a regular "slow tick" timer process which will
 281          * make periodic attempts to refill these starving Free Lists ...
 282          */
 283         DECLARE_BITMAP(starving_fl, MAX_EGRQ);
 284         struct timer_list rx_timer;
 285
 286         /*
 287          * State for cleaning up completed TX descriptors.
 288          */
 289         struct timer_list tx_timer;
 290
 291         /*
 292          * Write-once/infrequently fields.
 293          * -------------------------------
 294          */
 295
 296         u16 max_ethqsets;               /* # of available Ethernet queue sets */
 297         u16 ethqsets;                   /* # of active Ethernet queue sets */
 298         u16 ethtxq_rover;               /* Tx queue to clean up next */
 299         u16 timer_val[SGE_NTIMERS];     /* interrupt holdoff timer array */
 300         u8 counter_val[SGE_NCOUNTERS];  /* interrupt RX threshold array */
 301
 302         /*
 303          * Reverse maps from Absolute Queue IDs to associated queue pointers.
 304          * The absolute Queue IDs are in a compact range which start at a
 305          * [potentially large] Base Queue ID.  We perform the reverse map by
 306          * first converting the Absolute Queue ID into a Relative Queue ID by
 307          * subtracting off the Base Queue ID and then use a Relative Queue ID
 308          * indexed table to get the pointer to the corresponding software
 309          * queue structure.
 310          */
 311         unsigned int egr_base;
 312         unsigned int ingr_base;
 313         void *egr_map[MAX_EGRQ];
 314         struct sge_rspq *ingr_map[MAX_INGQ];
 315 };
 316
 317 /*
 318  * Utility macros to convert Absolute- to Relative-Queue indices and Egress-
 319  * and Ingress-Queues.  The EQ_MAP() and IQ_MAP() macros which provide
 320  * pointers to Ingress- and Egress-Queues can be used as both L- and R-values
 321  */
 322 #define EQ_IDX(s, abs_id) ((unsigned int)((abs_id) - (s)->egr_base))
 323 #define IQ_IDX(s, abs_id) ((unsigned int)((abs_id) - (s)->ingr_base))
 324
 325 #define EQ_MAP(s, abs_id) ((s)->egr_map[EQ_IDX(s, abs_id)])
 326 #define IQ_MAP(s, abs_id) ((s)->ingr_map[IQ_IDX(s, abs_id)])
 327
 328 /*
 329  * Macro to iterate across Queue Sets ("rxq" is a historic misnomer).
 330  */
 331 #define for_each_ethrxq(sge, iter) \
 332         for (iter = 0; iter < (sge)->ethqsets; iter++)
 333
 334 /*
 335  * Per-"adapter" (Virtual Function) information.
 336  */
 337 struct adapter {
 338         /* PCI resources */
 339         void __iomem *regs;
 340         struct pci_dev *pdev;
 341         struct device *pdev_dev;
 342
 343         /* "adapter" resources */
 344         unsigned long registered_device_map;
 345         unsigned long open_device_map;
 346         unsigned long flags;
 347         struct adapter_params params;
 348
 349         /* queue and interrupt resources */
 350         struct {
 351                 unsigned short vec;
 352                 char desc[22];
 353         } msix_info[MSIX_ENTRIES];
 354         struct sge sge;
 355
 356         /* Linux network device resources */
 357         struct net_device *port[MAX_NPORTS];
 358         const char *name;
 359         unsigned int msg_enable;
 360
 361         /* debugfs resources */
 362         struct dentry *debugfs_root;
 363
 364         /* various locks */
 365         spinlock_t stats_lock;
 366 };
 367
 368 enum { /* adapter flags */
 369         FULL_INIT_DONE     = (1UL << 0),
 370         USING_MSI          = (1UL << 1),
 371         USING_MSIX         = (1UL << 2),
 372         QUEUES_BOUND       = (1UL << 3),
 373 };
 374
 375 /*
 376  * The following register read/write routine definitions are required by
 377  * the common code.
 378  */
 379
 380 /**
 381  * t4_read_reg - read a HW register
 382  * @adapter: the adapter
 383  * @reg_addr: the register address
 384  *
 385  * Returns the 32-bit value of the given HW register.
 386  */
 387 static inline u32 t4_read_reg(struct adapter *adapter, u32 reg_addr)
 388 {
 389         return readl(adapter->regs + reg_addr);
 390 }
 391
 392 /**
 393  * t4_write_reg - write a HW register
 394  * @adapter: the adapter
 395  * @reg_addr: the register address
 396  * @val: the value to write
 397  *
 398  * Write a 32-bit value into the given HW register.
 399  */
 400 static inline void t4_write_reg(struct adapter *adapter, u32 reg_addr, u32 val)
 401 {
 402         writel(val, adapter->regs + reg_addr);
 403 }
 404
 405 #ifndef readq
 406 static inline u64 readq(const volatile void __iomem *addr)
 407 {
 408         return readl(addr) + ((u64)readl(addr + 4) << 32);
 409 }
 410
 411 static inline void writeq(u64 val, volatile void __iomem *addr)
 412 {
 413         writel(val, addr);
 414         writel(val >> 32, addr + 4);
 415 }
 416 #endif
 417
 418 /**
 419  * t4_read_reg64 - read a 64-bit HW register
 420  * @adapter: the adapter
 421  * @reg_addr: the register address
 422  *
 423  * Returns the 64-bit value of the given HW register.
 424  */
 425 static inline u64 t4_read_reg64(struct adapter *adapter, u32 reg_addr)
 426 {
 427         return readq(adapter->regs + reg_addr);
 428 }
 429
 430 /**
 431  * t4_write_reg64 - write a 64-bit HW register
 432  * @adapter: the adapter
 433  * @reg_addr: the register address
 434  * @val: the value to write
 435  *
 436  * Write a 64-bit value into the given HW register.
 437  */
 438 static inline void t4_write_reg64(struct adapter *adapter, u32 reg_addr,
 439                                   u64 val)
 440 {
 441         writeq(val, adapter->regs + reg_addr);
 442 }
 443
 444 /**
 445  * port_name - return the string name of a port
 446  * @adapter: the adapter
 447  * @pidx: the port index
 448  *
 449  * Return the string name of the selected port.
 450  */
 451 static inline const char *port_name(struct adapter *adapter, int pidx)
 452 {
 453         return adapter->port[pidx]->name;
 454 }
 455
 456 /**
 457  * t4_os_set_hw_addr - store a port's MAC address in SW
 458  * @adapter: the adapter
 459  * @pidx: the port index
 460  * @hw_addr: the Ethernet address
 461  *
 462  * Store the Ethernet address of the given port in SW.  Called by the common
 463  * code when it retrieves a port's Ethernet address from EEPROM.
 464  */
 465 static inline void t4_os_set_hw_addr(struct adapter *adapter, int pidx,
 466                                      u8 hw_addr[])
 467 {
 468         memcpy(adapter->port[pidx]->dev_addr, hw_addr, ETH_ALEN);
 469         memcpy(adapter->port[pidx]->perm_addr, hw_addr, ETH_ALEN);
 470 }
 471
 472 /**
 473  * netdev2pinfo - return the port_info structure associated with a net_device
 474  * @dev: the netdev
 475  *
 476  * Return the struct port_info associated with a net_device
 477  */
 478 static inline struct port_info *netdev2pinfo(const struct net_device *dev)
 479 {
 480         return netdev_priv(dev);
 481 }
 482
 483 /**
 484  * adap2pinfo - return the port_info of a port
 485  * @adap: the adapter
 486  * @pidx: the port index
 487  *
 488  * Return the port_info structure for the adapter.
 489  */
 490 static inline struct port_info *adap2pinfo(struct adapter *adapter, int pidx)
 491 {
 492         return netdev_priv(adapter->port[pidx]);
 493 }
 494
 495 /**
 496  * netdev2adap - return the adapter structure associated with a net_device
 497  * @dev: the netdev
 498  *
 499  * Return the struct adapter associated with a net_device
 500  */
 501 static inline struct adapter *netdev2adap(const struct net_device *dev)
 502 {
 503         return netdev2pinfo(dev)->adapter;
 504 }
 505
 506 /*
 507  * OS "Callback" function declarations.  These are functions that the OS code
 508  * is "contracted" to provide for the common code.
 509  */
 510 void t4vf_os_link_changed(struct adapter *, int, int);
 511
 512 /*
 513  * SGE function prototype declarations.
 514  */
 515 int t4vf_sge_alloc_rxq(struct adapter *, struct sge_rspq *, bool,
 516                        struct net_device *, int,
 517                        struct sge_fl *, rspq_handler_t);
 518 int t4vf_sge_alloc_eth_txq(struct adapter *, struct sge_eth_txq *,
 519                            struct net_device *, struct netdev_queue *,
 520                            unsigned int);
 521 void t4vf_free_sge_resources(struct adapter *);
 522
 523 int t4vf_eth_xmit(struct sk_buff *, struct net_device *);
 524 int t4vf_ethrx_handler(struct sge_rspq *, const __be64 *,
 525                        const struct pkt_gl *);
 526
 527 irq_handler_t t4vf_intr_handler(struct adapter *);
 528 irqreturn_t t4vf_sge_intr_msix(int, void *);
 529
 530 int t4vf_sge_init(struct adapter *);
 531 void t4vf_sge_start(struct adapter *);
 532 void t4vf_sge_stop(struct adapter *);
 533
 534 #endif /* __CXGB4VF_ADAPTER_H__ */