drivers/net/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/pci.h>
  44 #include <linux/spinlock.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/if_ether.h>
  47 #include <linux/netdevice.h>
  48
  49 #include "../cxgb4/t4_hw.h"
  50
  51 /*
  52  * Constants of the implementation.
  53  */
  54 enum {
  55         MAX_NPORTS      = 1,            /* max # of "ports" */
  56         MAX_PORT_QSETS  = 8,            /* max # of Queue Sets / "port" */
  57         MAX_ETH_QSETS   = MAX_NPORTS*MAX_PORT_QSETS,
  58
  59         /*
  60          * MSI-X interrupt index usage.
  61          */
  62         MSIX_FW         = 0,            /* MSI-X index for firmware Q */
  63         MSIX_NIQFLINT   = 1,            /* MSI-X index base for Ingress Qs */
  64         MSIX_EXTRAS     = 1,
  65         MSIX_ENTRIES    = MAX_ETH_QSETS + MSIX_EXTRAS,
  66
  67         /*
  68          * The maximum number of Ingress and Egress Queues is determined by
  69          * the maximum number of "Queue Sets" which we support plus any
  70          * ancillary queues.  Each "Queue Set" requires one Ingress Queue
  71          * for RX Packet Ingress Event notifications and two Egress Queues for
  72          * a Free List and an Ethernet TX list.
  73          */
  74         INGQ_EXTRAS     = 2,            /* firmware event queue and */
  75                                         /*   forwarded interrupts */
  76         MAX_INGQ        = MAX_ETH_QSETS+INGQ_EXTRAS,
  77         MAX_EGRQ        = MAX_ETH_QSETS*2,
  78 };
  79
  80 /*
  81  * Forward structure definition references.
  82  */
  83 struct adapter;
  84 struct sge_eth_rxq;
  85 struct sge_rspq;
  86
  87 /*
  88  * Per-"port" information.  This is really per-Virtual Interface information
  89  * but the use of the "port" nomanclature makes it easier to go back and forth
  90  * between the PF and VF drivers ...
  91  */
  92 struct port_info {
  93         struct adapter *adapter;        /* our adapter */
  94         struct vlan_group *vlan_grp;    /* out VLAN group */
  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 rx_offload;                  /* CSO, etc. */
 101         u8 nqsets;                      /* # of "Queue Sets" */
 102         u8 first_qset;                  /* index of first "Queue Set" */
 103         struct link_config link_cfg;    /* physical port configuration */
 104 };
 105
 106 /* port_info.rx_offload flags */
 107 enum {
 108         RX_CSO = 1 << 0,
 109 };
 110
 111 /*
 112  * Scatter Gather Engine resources for the "adapter".  Our ingress and egress
 113  * queues are organized into "Queue Sets" with one ingress and one egress
 114  * queue per Queue Set.  These Queue Sets are aportionable between the "ports"
 115  * (Virtual Interfaces).  One extra ingress queue is used to receive
 116  * asynchronous messages from the firmware.  Note that the "Queue IDs" that we
 117  * use here are really "Relative Queue IDs" which are returned as part of the
 118  * firmware command to allocate queues.  These queue IDs are relative to the
 119  * absolute Queue ID base of the section of the Queue ID space allocated to
 120  * the PF/VF.
 121  */
 122
 123 /*
 124  * SGE free-list queue state.
 125  */
 126 struct rx_sw_desc;
 127 struct sge_fl {
 128         unsigned int avail;             /* # of available RX buffers */
 129         unsigned int pend_cred;         /* new buffers since last FL DB ring */
 130         unsigned int cidx;              /* consumer index */
 131         unsigned int pidx;              /* producer index */
 132         unsigned long alloc_failed;     /* # of buffer allocation failures */
 133         unsigned long large_alloc_failed;
 134         unsigned long starving;         /* # of times FL was found starving */
 135
 136         /*
 137          * Write-once/infrequently fields.
 138          * -------------------------------
 139          */
 140
 141         unsigned int cntxt_id;          /* SGE relative QID for the free list */
 142         unsigned int abs_id;            /* SGE absolute QID for the free list */
 143         unsigned int size;              /* capacity of free list */
 144         struct rx_sw_desc *sdesc;       /* address of SW RX descriptor ring */
 145         __be64 *desc;                   /* address of HW RX descriptor ring */
 146         dma_addr_t addr;                /* PCI bus address of hardware ring */
 147 };
 148
 149 /*
 150  * An ingress packet gather list.
 151  */
 152 struct pkt_gl {
 153         skb_frag_t frags[MAX_SKB_FRAGS];
 154         void *va;                       /* virtual address of first byte */
 155         unsigned int nfrags;            /* # of fragments */
 156         unsigned int tot_len;           /* total length of fragments */
 157 };
 158
 159 typedef int (*rspq_handler_t)(struct sge_rspq *, const __be64 *,
 160                               const struct pkt_gl *);
 161
 162 /*
 163  * State for an SGE Response Queue.
 164  */
 165 struct sge_rspq {
 166         struct napi_struct napi;        /* NAPI scheduling control */
 167         const __be64 *cur_desc;         /* current descriptor in queue */
 168         unsigned int cidx;              /* consumer index */
 169         u8 gen;                         /* current generation bit */
 170         u8 next_intr_params;            /* holdoff params for next interrupt */
 171         int offset;                     /* offset into current FL buffer */
 172
 173         unsigned int unhandled_irqs;    /* bogus interrupts */
 174
 175         /*
 176          * Write-once/infrequently fields.
 177          * -------------------------------
 178          */
 179
 180         u8 intr_params;                 /* interrupt holdoff parameters */
 181         u8 pktcnt_idx;                  /* interrupt packet threshold */
 182         u8 idx;                         /* queue index within its group */
 183         u16 cntxt_id;                   /* SGE rel QID for the response Q */
 184         u16 abs_id;                     /* SGE abs QID for the response Q */
 185         __be64 *desc;                   /* address of hardware response ring */
 186         dma_addr_t phys_addr;           /* PCI bus address of ring */
 187         unsigned int iqe_len;           /* entry size */
 188         unsigned int size;              /* capcity of response Q */
 189         struct adapter *adapter;        /* our adapter */
 190         struct net_device *netdev;      /* associated net device */
 191         rspq_handler_t handler;         /* the handler for this response Q */
 192 };
 193
 194 /*
 195  * Ethernet queue statistics
 196  */
 197 struct sge_eth_stats {
 198         unsigned long pkts;             /* # of ethernet packets */
 199         unsigned long lro_pkts;         /* # of LRO super packets */
 200         unsigned long lro_merged;       /* # of wire packets merged by LRO */
 201         unsigned long rx_cso;           /* # of Rx checksum offloads */
 202         unsigned long vlan_ex;          /* # of Rx VLAN extractions */
 203         unsigned long rx_drops;         /* # of packets dropped due to no mem */
 204 };
 205
 206 /*
 207  * State for an Ethernet Receive Queue.
 208  */
 209 struct sge_eth_rxq {
 210         struct sge_rspq rspq;           /* Response Queue */
 211         struct sge_fl fl;               /* Free List */
 212         struct sge_eth_stats stats;     /* receive statistics */
 213 };
 214
 215 /*
 216  * SGE Transmit Queue state.  This contains all of the resources associated
 217  * with the hardware status of a TX Queue which is a circular ring of hardware
 218  * TX Descriptors.  For convenience, it also contains a pointer to a parallel
 219  * "Software Descriptor" array but we don't know anything about it here other
 220  * than its type name.
 221  */
 222 struct tx_desc {
 223         /*
 224          * Egress Queues are measured in units of SGE_EQ_IDXSIZE by the
 225          * hardware: Sizes, Producer and Consumer indices, etc.
 226          */
 227         __be64 flit[SGE_EQ_IDXSIZE/sizeof(__be64)];
 228 };
 229 struct tx_sw_desc;
 230 struct sge_txq {
 231         unsigned int in_use;            /* # of in-use TX descriptors */
 232         unsigned int size;              /* # of descriptors */
 233         unsigned int cidx;              /* SW consumer index */
 234         unsigned int pidx;              /* producer index */
 235         unsigned long stops;            /* # of times queue has been stopped */
 236         unsigned long restarts;         /* # of queue restarts */
 237
 238         /*
 239          * Write-once/infrequently fields.
 240          * -------------------------------
 241          */
 242
 243         unsigned int cntxt_id;          /* SGE relative QID for the TX Q */
 244         unsigned int abs_id;            /* SGE absolute QID for the TX Q */
 245         struct tx_desc *desc;           /* address of HW TX descriptor ring */
 246         struct tx_sw_desc *sdesc;       /* address of SW TX descriptor ring */
 247         struct sge_qstat *stat;         /* queue status entry */
 248         dma_addr_t phys_addr;           /* PCI bus address of hardware ring */
 249 };
 250
 251 /*
 252  * State for an Ethernet Transmit Queue.
 253  */
 254 struct sge_eth_txq {
 255         struct sge_txq q;               /* SGE TX Queue */
 256         struct netdev_queue *txq;       /* associated netdev TX queue */
 257         unsigned long tso;              /* # of TSO requests */
 258         unsigned long tx_cso;           /* # of TX checksum offloads */
 259         unsigned long vlan_ins;         /* # of TX VLAN insertions */
 260         unsigned long mapping_err;      /* # of I/O MMU packet mapping errors */
 261 };
 262
 263 /*
 264  * The complete set of Scatter/Gather Engine resources.
 265  */
 266 struct sge {
 267         /*
 268          * Our "Queue Sets" ...
 269          */
 270         struct sge_eth_txq ethtxq[MAX_ETH_QSETS];
 271         struct sge_eth_rxq ethrxq[MAX_ETH_QSETS];
 272
 273         /*
 274          * Extra ingress queues for asynchronous firmware events and
 275          * forwarded interrupts (when in MSI mode).
 276          */
 277         struct sge_rspq fw_evtq ____cacheline_aligned_in_smp;
 278
 279         struct sge_rspq intrq ____cacheline_aligned_in_smp;
 280         spinlock_t intrq_lock;
 281
 282         /*
 283          * State for managing "starving Free Lists" -- Free Lists which have
 284          * fallen below a certain threshold of buffers available to the
 285          * hardware and attempts to refill them up to that threshold have
 286          * failed.  We have a regular "slow tick" timer process which will
 287          * make periodic attempts to refill these starving Free Lists ...
 288          */
 289         DECLARE_BITMAP(starving_fl, MAX_EGRQ);
 290         struct timer_list rx_timer;
 291
 292         /*
 293          * State for cleaning up completed TX descriptors.
 294          */
 295         struct timer_list tx_timer;
 296
 297         /*
 298          * Write-once/infrequently fields.
 299          * -------------------------------
 300          */
 301
 302         u16 max_ethqsets;               /* # of available Ethernet queue sets */
 303         u16 ethqsets;                   /* # of active Ethernet queue sets */
 304         u16 ethtxq_rover;               /* Tx queue to clean up next */
 305         u16 timer_val[SGE_NTIMERS];     /* interrupt holdoff timer array */
 306         u8 counter_val[SGE_NCOUNTERS];  /* interrupt RX threshold array */
 307
 308         /*
 309          * Reverse maps from Absolute Queue IDs to associated queue pointers.
 310          * The absolute Queue IDs are in a compact range which start at a
 311          * [potentially large] Base Queue ID.  We perform the reverse map by
 312          * first converting the Absolute Queue ID into a Relative Queue ID by
 313          * subtracting off the Base Queue ID and then use a Relative Queue ID
 314          * indexed table to get the pointer to the corresponding software
 315          * queue structure.
 316          */
 317         unsigned int egr_base;
 318         unsigned int ingr_base;
 319         void *egr_map[MAX_EGRQ];
 320         struct sge_rspq *ingr_map[MAX_INGQ];
 321 };
 322
 323 /*
 324  * Utility macros to convert Absolute- to Relative-Queue indices and Egress-
 325  * and Ingress-Queues.  The EQ_MAP() and IQ_MAP() macros which provide
 326  * pointers to Ingress- and Egress-Queues can be used as both L- and R-values
 327  */
 328 #define EQ_IDX(s, abs_id) ((unsigned int)((abs_id) - (s)->egr_base))
 329 #define IQ_IDX(s, abs_id) ((unsigned int)((abs_id) - (s)->ingr_base))
 330
 331 #define EQ_MAP(s, abs_id) ((s)->egr_map[EQ_IDX(s, abs_id)])
 332 #define IQ_MAP(s, abs_id) ((s)->ingr_map[IQ_IDX(s, abs_id)])
 333
 334 /*
 335  * Macro to iterate across Queue Sets ("rxq" is a historic misnomer).
 336  */
 337 #define for_each_ethrxq(sge, iter) \
 338         for (iter = 0; iter < (sge)->ethqsets; iter++)
 339
 340 /*
 341  * Per-"adapter" (Virtual Function) information.
 342  */
 343 struct adapter {
 344         /* PCI resources */
 345         void __iomem *regs;
 346         struct pci_dev *pdev;
 347         struct device *pdev_dev;
 348
 349         /* "adapter" resources */
 350         unsigned long registered_device_map;
 351         unsigned long open_device_map;
 352         unsigned long flags;
 353         struct adapter_params params;
 354
 355         /* queue and interrupt resources */
 356         struct {
 357                 unsigned short vec;
 358                 char desc[22];
 359         } msix_info[MSIX_ENTRIES];
 360         struct sge sge;
 361
 362         /* Linux network device resources */
 363         struct net_device *port[MAX_NPORTS];
 364         const char *name;
 365         unsigned int msg_enable;
 366
 367         /* debugfs resources */
 368         struct dentry *debugfs_root;
 369
 370         /* various locks */
 371         spinlock_t stats_lock;
 372 };
 373
 374 enum { /* adapter flags */
 375         FULL_INIT_DONE     = (1UL << 0),
 376         USING_MSI          = (1UL << 1),
 377         USING_MSIX         = (1UL << 2),
 378         QUEUES_BOUND       = (1UL << 3),
 379 };
 380
 381 /*
 382  * The following register read/write routine definitions are required by
 383  * the common code.
 384  */
 385
 386 /**
 387  * t4_read_reg - read a HW register
 388  * @adapter: the adapter
 389  * @reg_addr: the register address
 390  *
 391  * Returns the 32-bit value of the given HW register.
 392  */
 393 static inline u32 t4_read_reg(struct adapter *adapter, u32 reg_addr)
 394 {
 395         return readl(adapter->regs + reg_addr);
 396 }
 397
 398 /**
 399  * t4_write_reg - write a HW register
 400  * @adapter: the adapter
 401  * @reg_addr: the register address
 402  * @val: the value to write
 403  *
 404  * Write a 32-bit value into the given HW register.
 405  */
 406 static inline void t4_write_reg(struct adapter *adapter, u32 reg_addr, u32 val)
 407 {
 408         writel(val, adapter->regs + reg_addr);
 409 }
 410
 411 #ifndef readq
 412 static inline u64 readq(const volatile void __iomem *addr)
 413 {
 414         return readl(addr) + ((u64)readl(addr + 4) << 32);
 415 }
 416
 417 static inline void writeq(u64 val, volatile void __iomem *addr)
 418 {
 419         writel(val, addr);
 420         writel(val >> 32, addr + 4);
 421 }
 422 #endif
 423
 424 /**
 425  * t4_read_reg64 - read a 64-bit HW register
 426  * @adapter: the adapter
 427  * @reg_addr: the register address
 428  *
 429  * Returns the 64-bit value of the given HW register.
 430  */
 431 static inline u64 t4_read_reg64(struct adapter *adapter, u32 reg_addr)
 432 {
 433         return readq(adapter->regs + reg_addr);
 434 }
 435
 436 /**
 437  * t4_write_reg64 - write a 64-bit HW register
 438  * @adapter: the adapter
 439  * @reg_addr: the register address
 440  * @val: the value to write
 441  *
 442  * Write a 64-bit value into the given HW register.
 443  */
 444 static inline void t4_write_reg64(struct adapter *adapter, u32 reg_addr,
 445                                   u64 val)
 446 {
 447         writeq(val, adapter->regs + reg_addr);
 448 }
 449
 450 /**
 451  * port_name - return the string name of a port
 452  * @adapter: the adapter
 453  * @pidx: the port index
 454  *
 455  * Return the string name of the selected port.
 456  */
 457 static inline const char *port_name(struct adapter *adapter, int pidx)
 458 {
 459         return adapter->port[pidx]->name;
 460 }
 461
 462 /**
 463  * t4_os_set_hw_addr - store a port's MAC address in SW
 464  * @adapter: the adapter
 465  * @pidx: the port index
 466  * @hw_addr: the Ethernet address
 467  *
 468  * Store the Ethernet address of the given port in SW.  Called by the common
 469  * code when it retrieves a port's Ethernet address from EEPROM.
 470  */
 471 static inline void t4_os_set_hw_addr(struct adapter *adapter, int pidx,
 472                                      u8 hw_addr[])
 473 {
 474         memcpy(adapter->port[pidx]->dev_addr, hw_addr, ETH_ALEN);
 475         memcpy(adapter->port[pidx]->perm_addr, hw_addr, ETH_ALEN);
 476 }
 477
 478 /**
 479  * netdev2pinfo - return the port_info structure associated with a net_device
 480  * @dev: the netdev
 481  *
 482  * Return the struct port_info associated with a net_device
 483  */
 484 static inline struct port_info *netdev2pinfo(const struct net_device *dev)
 485 {
 486         return netdev_priv(dev);
 487 }
 488
 489 /**
 490  * adap2pinfo - return the port_info of a port
 491  * @adap: the adapter
 492  * @pidx: the port index
 493  *
 494  * Return the port_info structure for the adapter.
 495  */
 496 static inline struct port_info *adap2pinfo(struct adapter *adapter, int pidx)
 497 {
 498         return netdev_priv(adapter->port[pidx]);
 499 }
 500
 501 /**
 502  * netdev2adap - return the adapter structure associated with a net_device
 503  * @dev: the netdev
 504  *
 505  * Return the struct adapter associated with a net_device
 506  */
 507 static inline struct adapter *netdev2adap(const struct net_device *dev)
 508 {
 509         return netdev2pinfo(dev)->adapter;
 510 }
 511
 512 /*
 513  * OS "Callback" function declarations.  These are functions that the OS code
 514  * is "contracted" to provide for the common code.
 515  */
 516 void t4vf_os_link_changed(struct adapter *, int, int);
 517
 518 /*
 519  * SGE function prototype declarations.
 520  */
 521 int t4vf_sge_alloc_rxq(struct adapter *, struct sge_rspq *, bool,
 522                        struct net_device *, int,
 523                        struct sge_fl *, rspq_handler_t);
 524 int t4vf_sge_alloc_eth_txq(struct adapter *, struct sge_eth_txq *,
 525                            struct net_device *, struct netdev_queue *,
 526                            unsigned int);
 527 void t4vf_free_sge_resources(struct adapter *);
 528
 529 int t4vf_eth_xmit(struct sk_buff *, struct net_device *);
 530 int t4vf_ethrx_handler(struct sge_rspq *, const __be64 *,
 531                        const struct pkt_gl *);
 532
 533 irq_handler_t t4vf_intr_handler(struct adapter *);
 534 irqreturn_t t4vf_sge_intr_msix(int, void *);
 535
 536 int t4vf_sge_init(struct adapter *);
 537 void t4vf_sge_start(struct adapter *);
 538 void t4vf_sge_stop(struct adapter *);
 539
 540 #endif /* __CXGB4VF_ADAPTER_H__ */