drivers/scsi/fnic/fnic.h

   1 /*
   2  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  *
   5  * This program is free software; you may redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16  * SOFTWARE.
  17  */
  18 #ifndef _FNIC_H_
  19 #define _FNIC_H_
  20
  21 #include <linux/interrupt.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/bitops.h>
  25 #include <scsi/libfc.h>
  26 #include <scsi/libfcoe.h>
  27 #include "fnic_io.h"
  28 #include "fnic_res.h"
  29 #include "fnic_trace.h"
  30 #include "vnic_dev.h"
  31 #include "vnic_wq.h"
  32 #include "vnic_rq.h"
  33 #include "vnic_cq.h"
  34 #include "vnic_wq_copy.h"
  35 #include "vnic_intr.h"
  36 #include "vnic_stats.h"
  37 #include "vnic_scsi.h"
  38
  39 #define DRV_NAME                "fnic"
  40 #define DRV_DESCRIPTION         "Cisco FCoE HBA Driver"
  41 #define DRV_VERSION             "1.5.0.23"
  42 #define PFX                     DRV_NAME ": "
  43 #define DFX                     DRV_NAME "%d: "
  44
  45 #define DESC_CLEAN_LOW_WATERMARK 8
  46 #define FNIC_MAX_IO_REQ         2048 /* scsi_cmnd tag map entries */
  47 #define FNIC_IO_LOCKS           64 /* IO locks: power of 2 */
  48 #define FNIC_DFLT_QUEUE_DEPTH   32
  49 #define FNIC_STATS_RATE_LIMIT   4 /* limit rate at which stats are pulled up */
  50
  51 /*
  52  * Tag bits used for special requests.
  53  */
  54 #define FNIC_TAG_ABORT          BIT(30)         /* tag bit indicating abort */
  55 #define FNIC_TAG_DEV_RST        BIT(29)         /* indicates device reset */
  56 #define FNIC_TAG_MASK           (BIT(24) - 1)   /* mask for lookup */
  57 #define FNIC_NO_TAG             -1
  58
  59 /*
  60  * Command flags to identify the type of command and for other future
  61  * use.
  62  */
  63 #define FNIC_NO_FLAGS                   0
  64 #define FNIC_IO_INITIALIZED             BIT(0)
  65 #define FNIC_IO_ISSUED                  BIT(1)
  66 #define FNIC_IO_DONE                    BIT(2)
  67 #define FNIC_IO_REQ_NULL                BIT(3)
  68 #define FNIC_IO_ABTS_PENDING            BIT(4)
  69 #define FNIC_IO_ABORTED                 BIT(5)
  70 #define FNIC_IO_ABTS_ISSUED             BIT(6)
  71 #define FNIC_IO_TERM_ISSUED             BIT(7)
  72 #define FNIC_IO_INTERNAL_TERM_ISSUED    BIT(8)
  73 #define FNIC_IO_ABT_TERM_DONE           BIT(9)
  74 #define FNIC_IO_ABT_TERM_REQ_NULL       BIT(10)
  75 #define FNIC_IO_ABT_TERM_TIMED_OUT      BIT(11)
  76 #define FNIC_DEVICE_RESET               BIT(12)  /* Device reset request */
  77 #define FNIC_DEV_RST_ISSUED             BIT(13)
  78 #define FNIC_DEV_RST_TIMED_OUT          BIT(14)
  79 #define FNIC_DEV_RST_ABTS_ISSUED        BIT(15)
  80 #define FNIC_DEV_RST_TERM_ISSUED        BIT(16)
  81 #define FNIC_DEV_RST_DONE               BIT(17)
  82 #define FNIC_DEV_RST_REQ_NULL           BIT(18)
  83 #define FNIC_DEV_RST_ABTS_DONE          BIT(19)
  84 #define FNIC_DEV_RST_TERM_DONE          BIT(20)
  85 #define FNIC_DEV_RST_ABTS_PENDING       BIT(21)
  86
  87 /*
  88  * Usage of the scsi_cmnd scratchpad.
  89  * These fields are locked by the hashed io_req_lock.
  90  */
  91 #define CMD_SP(Cmnd)            ((Cmnd)->SCp.ptr)
  92 #define CMD_STATE(Cmnd)         ((Cmnd)->SCp.phase)
  93 #define CMD_ABTS_STATUS(Cmnd)   ((Cmnd)->SCp.Message)
  94 #define CMD_LR_STATUS(Cmnd)     ((Cmnd)->SCp.have_data_in)
  95 #define CMD_TAG(Cmnd)           ((Cmnd)->SCp.sent_command)
  96 #define CMD_FLAGS(Cmnd)         ((Cmnd)->SCp.Status)
  97
  98 #define FCPIO_INVALID_CODE 0x100 /* hdr_status value unused by firmware */
  99
 100 #define FNIC_LUN_RESET_TIMEOUT       10000      /* mSec */
 101 #define FNIC_HOST_RESET_TIMEOUT      10000      /* mSec */
 102 #define FNIC_RMDEVICE_TIMEOUT        1000       /* mSec */
 103 #define FNIC_HOST_RESET_SETTLE_TIME  30         /* Sec */
 104 #define FNIC_ABT_TERM_DELAY_TIMEOUT  500        /* mSec */
 105
 106 #define FNIC_MAX_FCP_TARGET     256
 107
 108 /**
 109  * state_flags to identify host state along along with fnic's state
 110  **/
 111 #define __FNIC_FLAGS_FWRESET            BIT(0) /* fwreset in progress */
 112 #define __FNIC_FLAGS_BLOCK_IO           BIT(1) /* IOs are blocked */
 113
 114 #define FNIC_FLAGS_NONE                 (0)
 115 #define FNIC_FLAGS_FWRESET              (__FNIC_FLAGS_FWRESET | \
 116                                         __FNIC_FLAGS_BLOCK_IO)
 117
 118 #define FNIC_FLAGS_IO_BLOCKED           (__FNIC_FLAGS_BLOCK_IO)
 119
 120 #define fnic_set_state_flags(fnicp, st_flags)   \
 121         __fnic_set_state_flags(fnicp, st_flags, 0)
 122
 123 #define fnic_clear_state_flags(fnicp, st_flags)  \
 124         __fnic_set_state_flags(fnicp, st_flags, 1)
 125
 126 extern unsigned int fnic_log_level;
 127
 128 #define FNIC_MAIN_LOGGING 0x01
 129 #define FNIC_FCS_LOGGING 0x02
 130 #define FNIC_SCSI_LOGGING 0x04
 131 #define FNIC_ISR_LOGGING 0x08
 132
 133 #define FNIC_CHECK_LOGGING(LEVEL, CMD)                          \
 134 do {                                                            \
 135         if (unlikely(fnic_log_level & LEVEL))                   \
 136                 do {                                            \
 137                         CMD;                                    \
 138                 } while (0);                                    \
 139 } while (0)
 140
 141 #define FNIC_MAIN_DBG(kern_level, host, fmt, args...)           \
 142         FNIC_CHECK_LOGGING(FNIC_MAIN_LOGGING,                   \
 143                          shost_printk(kern_level, host, fmt, ##args);)
 144
 145 #define FNIC_FCS_DBG(kern_level, host, fmt, args...)            \
 146         FNIC_CHECK_LOGGING(FNIC_FCS_LOGGING,                    \
 147                          shost_printk(kern_level, host, fmt, ##args);)
 148
 149 #define FNIC_SCSI_DBG(kern_level, host, fmt, args...)           \
 150         FNIC_CHECK_LOGGING(FNIC_SCSI_LOGGING,                   \
 151                          shost_printk(kern_level, host, fmt, ##args);)
 152
 153 #define FNIC_ISR_DBG(kern_level, host, fmt, args...)            \
 154         FNIC_CHECK_LOGGING(FNIC_ISR_LOGGING,                    \
 155                          shost_printk(kern_level, host, fmt, ##args);)
 156
 157 extern const char *fnic_state_str[];
 158
 159 enum fnic_intx_intr_index {
 160         FNIC_INTX_WQ_RQ_COPYWQ,
 161         FNIC_INTX_ERR,
 162         FNIC_INTX_NOTIFY,
 163         FNIC_INTX_INTR_MAX,
 164 };
 165
 166 enum fnic_msix_intr_index {
 167         FNIC_MSIX_RQ,
 168         FNIC_MSIX_WQ,
 169         FNIC_MSIX_WQ_COPY,
 170         FNIC_MSIX_ERR_NOTIFY,
 171         FNIC_MSIX_INTR_MAX,
 172 };
 173
 174 struct fnic_msix_entry {
 175         int requested;
 176         char devname[IFNAMSIZ];
 177         irqreturn_t (*isr)(int, void *);
 178         void *devid;
 179 };
 180
 181 enum fnic_state {
 182         FNIC_IN_FC_MODE = 0,
 183         FNIC_IN_FC_TRANS_ETH_MODE,
 184         FNIC_IN_ETH_MODE,
 185         FNIC_IN_ETH_TRANS_FC_MODE,
 186 };
 187
 188 #define FNIC_WQ_COPY_MAX 1
 189 #define FNIC_WQ_MAX 1
 190 #define FNIC_RQ_MAX 1
 191 #define FNIC_CQ_MAX (FNIC_WQ_COPY_MAX + FNIC_WQ_MAX + FNIC_RQ_MAX)
 192
 193 struct mempool;
 194
 195 enum fnic_evt {
 196         FNIC_EVT_START_VLAN_DISC = 1,
 197         FNIC_EVT_START_FCF_DISC = 2,
 198         FNIC_EVT_MAX,
 199 };
 200
 201 struct fnic_event {
 202         struct list_head list;
 203         struct fnic *fnic;
 204         enum fnic_evt event;
 205 };
 206
 207 /* Per-instance private data structure */
 208 struct fnic {
 209         struct fc_lport *lport;
 210         struct fcoe_ctlr ctlr;          /* FIP FCoE controller structure */
 211         struct vnic_dev_bar bar0;
 212
 213         struct msix_entry msix_entry[FNIC_MSIX_INTR_MAX];
 214         struct fnic_msix_entry msix[FNIC_MSIX_INTR_MAX];
 215
 216         struct vnic_stats *stats;
 217         unsigned long stats_time;       /* time of stats update */
 218         struct vnic_nic_cfg *nic_cfg;
 219         char name[IFNAMSIZ];
 220         struct timer_list notify_timer; /* used for MSI interrupts */
 221
 222         unsigned int err_intr_offset;
 223         unsigned int link_intr_offset;
 224
 225         unsigned int wq_count;
 226         unsigned int cq_count;
 227
 228         u32 vlan_hw_insert:1;           /* let hw insert the tag */
 229         u32 in_remove:1;                /* fnic device in removal */
 230         u32 stop_rx_link_events:1;      /* stop proc. rx frames, link events */
 231
 232         struct completion *remove_wait; /* device remove thread blocks */
 233
 234         atomic_t in_flight;             /* io counter */
 235         u32 _reserved;                  /* fill hole */
 236         unsigned long state_flags;      /* protected by host lock */
 237         enum fnic_state state;
 238         spinlock_t fnic_lock;
 239
 240         u16 vlan_id;                    /* VLAN tag including priority */
 241         u8 data_src_addr[ETH_ALEN];
 242         u64 fcp_input_bytes;            /* internal statistic */
 243         u64 fcp_output_bytes;           /* internal statistic */
 244         u32 link_down_cnt;
 245         int link_status;
 246
 247         struct list_head list;
 248         struct pci_dev *pdev;
 249         struct vnic_fc_config config;
 250         struct vnic_dev *vdev;
 251         unsigned int raw_wq_count;
 252         unsigned int wq_copy_count;
 253         unsigned int rq_count;
 254         int fw_ack_index[FNIC_WQ_COPY_MAX];
 255         unsigned short fw_ack_recd[FNIC_WQ_COPY_MAX];
 256         unsigned short wq_copy_desc_low[FNIC_WQ_COPY_MAX];
 257         unsigned int intr_count;
 258         u32 __iomem *legacy_pba;
 259         struct fnic_host_tag *tags;
 260         mempool_t *io_req_pool;
 261         mempool_t *io_sgl_pool[FNIC_SGL_NUM_CACHES];
 262         spinlock_t io_req_lock[FNIC_IO_LOCKS];  /* locks for scsi cmnds */
 263
 264         struct work_struct link_work;
 265         struct work_struct frame_work;
 266         struct sk_buff_head frame_queue;
 267         struct sk_buff_head tx_queue;
 268
 269         /*** FIP related data members  -- start ***/
 270         void (*set_vlan)(struct fnic *, u16 vlan);
 271         struct work_struct      fip_frame_work;
 272         struct sk_buff_head     fip_frame_queue;
 273         struct timer_list       fip_timer;
 274         struct list_head        vlans;
 275         spinlock_t              vlans_lock;
 276
 277         struct work_struct      event_work;
 278         struct list_head        evlist;
 279         /*** FIP related data members  -- end ***/
 280
 281         /* copy work queue cache line section */
 282         ____cacheline_aligned struct vnic_wq_copy wq_copy[FNIC_WQ_COPY_MAX];
 283         /* completion queue cache line section */
 284         ____cacheline_aligned struct vnic_cq cq[FNIC_CQ_MAX];
 285
 286         spinlock_t wq_copy_lock[FNIC_WQ_COPY_MAX];
 287
 288         /* work queue cache line section */
 289         ____cacheline_aligned struct vnic_wq wq[FNIC_WQ_MAX];
 290         spinlock_t wq_lock[FNIC_WQ_MAX];
 291
 292         /* receive queue cache line section */
 293         ____cacheline_aligned struct vnic_rq rq[FNIC_RQ_MAX];
 294
 295         /* interrupt resource cache line section */
 296         ____cacheline_aligned struct vnic_intr intr[FNIC_MSIX_INTR_MAX];
 297 };
 298
 299 static inline struct fnic *fnic_from_ctlr(struct fcoe_ctlr *fip)
 300 {
 301         return container_of(fip, struct fnic, ctlr);
 302 }
 303
 304 extern struct workqueue_struct *fnic_event_queue;
 305 extern struct workqueue_struct *fnic_fip_queue;
 306 extern struct device_attribute *fnic_attrs[];
 307
 308 void fnic_clear_intr_mode(struct fnic *fnic);
 309 int fnic_set_intr_mode(struct fnic *fnic);
 310 void fnic_free_intr(struct fnic *fnic);
 311 int fnic_request_intr(struct fnic *fnic);
 312
 313 int fnic_send(struct fc_lport *, struct fc_frame *);
 314 void fnic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf);
 315 void fnic_handle_frame(struct work_struct *work);
 316 void fnic_handle_link(struct work_struct *work);
 317 void fnic_handle_event(struct work_struct *work);
 318 int fnic_rq_cmpl_handler(struct fnic *fnic, int);
 319 int fnic_alloc_rq_frame(struct vnic_rq *rq);
 320 void fnic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf);
 321 void fnic_flush_tx(struct fnic *);
 322 void fnic_eth_send(struct fcoe_ctlr *, struct sk_buff *skb);
 323 void fnic_set_port_id(struct fc_lport *, u32, struct fc_frame *);
 324 void fnic_update_mac(struct fc_lport *, u8 *new);
 325 void fnic_update_mac_locked(struct fnic *, u8 *new);
 326
 327 int fnic_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
 328 int fnic_abort_cmd(struct scsi_cmnd *);
 329 int fnic_device_reset(struct scsi_cmnd *);
 330 int fnic_host_reset(struct scsi_cmnd *);
 331 int fnic_reset(struct Scsi_Host *);
 332 void fnic_scsi_cleanup(struct fc_lport *);
 333 void fnic_scsi_abort_io(struct fc_lport *);
 334 void fnic_empty_scsi_cleanup(struct fc_lport *);
 335 void fnic_exch_mgr_reset(struct fc_lport *, u32, u32);
 336 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int);
 337 int fnic_wq_cmpl_handler(struct fnic *fnic, int);
 338 int fnic_flogi_reg_handler(struct fnic *fnic, u32);
 339 void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
 340                                   struct fcpio_host_req *desc);
 341 int fnic_fw_reset_handler(struct fnic *fnic);
 342 void fnic_terminate_rport_io(struct fc_rport *);
 343 const char *fnic_state_to_str(unsigned int state);
 344
 345 void fnic_log_q_error(struct fnic *fnic);
 346 void fnic_handle_link_event(struct fnic *fnic);
 347
 348 int fnic_is_abts_pending(struct fnic *, struct scsi_cmnd *);
 349
 350 void fnic_handle_fip_frame(struct work_struct *work);
 351 void fnic_handle_fip_event(struct fnic *fnic);
 352 void fnic_fcoe_reset_vlans(struct fnic *fnic);
 353 void fnic_fcoe_evlist_free(struct fnic *fnic);
 354 extern void fnic_handle_fip_timer(struct fnic *fnic);
 355
 356 static inline int
 357 fnic_chk_state_flags_locked(struct fnic *fnic, unsigned long st_flags)
 358 {
 359         return ((fnic->state_flags & st_flags) == st_flags);
 360 }
 361 void __fnic_set_state_flags(struct fnic *, unsigned long, unsigned long);
 362 #endif /* _FNIC_H_ */