aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/cxgb4vf/adapter.h
blob: 4fd821aadc8afeb266fb5f2de86567c14d2a22f6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
/*
 * This file is part of the Chelsio T4 PCI-E SR-IOV Virtual Function Ethernet
 * driver for Linux.
 *
 * Copyright (c) 2009-2010 Chelsio Communications, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * This file should not be included directly.  Include t4vf_common.h instead.
 */

#ifndef __CXGB4VF_ADAPTER_H__
#define __CXGB4VF_ADAPTER_H__

#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>

#include "../cxgb4/t4_hw.h"

/*
 * Constants of the implementation.
 */
enum {
	MAX_NPORTS	= 1,		/* max # of "ports" */
	MAX_PORT_QSETS	= 8,		/* max # of Queue Sets / "port" */
	MAX_ETH_QSETS	= MAX_NPORTS*MAX_PORT_QSETS,

	/*
	 * MSI-X interrupt index usage.
	 */
	MSIX_FW		= 0,		/* MSI-X index for firmware Q */
	MSIX_IQFLINT	= 1,		/* MSI-X index base for Ingress Qs */
	MSIX_EXTRAS	= 1,
	MSIX_ENTRIES	= MAX_ETH_QSETS + MSIX_EXTRAS,

	/*
	 * The maximum number of Ingress and Egress Queues is determined by
	 * the maximum number of "Queue Sets" which we support plus any
	 * ancillary queues.  Each "Queue Set" requires one Ingress Queue
	 * for RX Packet Ingress Event notifications and two Egress Queues for
	 * a Free List and an Ethernet TX list.
	 */
	INGQ_EXTRAS	= 2,		/* firmware event queue and */
					/*   forwarded interrupts */
	MAX_INGQ	= MAX_ETH_QSETS+INGQ_EXTRAS,
	MAX_EGRQ	= MAX_ETH_QSETS*2,
};

/*
 * Forward structure definition references.
 */
struct adapter;
struct sge_eth_rxq;
struct sge_rspq;

/*
 * Per-"port" information.  This is really per-Virtual Interface information
 * but the use of the "port" nomanclature makes it easier to go back and forth
 * between the PF and VF drivers ...
 */
struct port_info {
	struct adapter *adapter;	/* our adapter */
	struct vlan_group *vlan_grp;	/* out VLAN group */
	u16 viid;			/* virtual interface ID */
	s16 xact_addr_filt;		/* index of our MAC address filter */
	u16 rss_size;			/* size of VI's RSS table slice */
	u8 pidx;			/* index into adapter port[] */
	u8 port_id;			/* physical port ID */
	u8 nqsets;			/* # of "Queue Sets" */
	u8 first_qset;			/* index of first "Queue Set" */
	struct link_config link_cfg;	/* physical port configuration */
};

/*
 * Scatter Gather Engine resources for the "adapter".  Our ingress and egress
 * queues are organized into "Queue Sets" with one ingress and one egress
 * queue per Queue Set.  These Queue Sets are aportionable between the "ports"
 * (Virtual Interfaces).  One extra ingress queue is used to receive
 * asynchronous messages from the firmware.  Note that the "Queue IDs" that we
 * use here are really "Relative Queue IDs" which are returned as part of the
 * firmware command to allocate queues.  These queue IDs are relative to the
 * absolute Queue ID base of the section of the Queue ID space allocated to
 * the PF/VF.
 */

/*
 * SGE free-list queue state.
 */
struct rx_sw_desc;
struct sge_fl {
	unsigned int avail;		/* # of available RX buffers */
	unsigned int pend_cred;		/* new buffers since last FL DB ring */
	unsigned int cidx;		/* consumer index */
	unsigned int pidx;		/* producer index */
	unsigned long alloc_failed;	/* # of buffer allocation failures */
	unsigned long large_alloc_failed;
	unsigned long starving;		/* # of times FL was found starving */

	/*
	 * Write-once/infrequently fields.
	 * -------------------------------
	 */

	unsigned int cntxt_id;		/* SGE relative QID for the free list */
	unsigned int abs_id;		/* SGE absolute QID for the free list */
	unsigned int size;		/* capacity of free list */
	struct rx_sw_desc *sdesc;	/* address of SW RX descriptor ring */
	__be64 *desc;			/* address of HW RX descriptor ring */
	dma_addr_t addr;		/* PCI bus address of hardware ring */
};

/*
 * An ingress packet gather list.
 */
struct pkt_gl {
	skb_frag_t frags[MAX_SKB_FRAGS];
	void *va;			/* virtual address of first byte */
	unsigned int nfrags;		/* # of fragments */
	unsigned int tot_len;		/* total length of fragments */
};

typedef int (*rspq_handler_t)(struct sge_rspq *, const __be64 *,
			      const struct pkt_gl *);

/*
 * State for an SGE Response Queue.
 */
struct sge_rspq {
	struct napi_struct napi;	/* NAPI scheduling control */
	const __be64 *cur_desc;		/* current descriptor in queue */
	unsigned int cidx;		/* consumer index */
	u8 gen;				/* current generation bit */
	u8 next_intr_params;		/* holdoff params for next interrupt */
	int offset;			/* offset into current FL buffer */

	unsigned int unhandled_irqs;	/* bogus interrupts */

	/*
	 * Write-once/infrequently fields.
	 * -------------------------------
	 */

	u8 intr_params;			/* interrupt holdoff parameters */
	u8 pktcnt_idx;			/* interrupt packet threshold */
	u8 idx;				/* queue index within its group */
	u16 cntxt_id;			/* SGE rel QID for the response Q */
	u16 abs_id;			/* SGE abs QID for the response Q */
	__be64 *desc;			/* address of hardware response ring */
	dma_addr_t phys_addr;		/* PCI bus address of ring */
	unsigned int iqe_len;		/* entry size */
	unsigned int size;		/* capcity of response Q */
	struct adapter *adapter;	/* our adapter */
	struct net_device *netdev;	/* associated net device */
	rspq_handler_t handler;		/* the handler for this response Q */
};

/*
 * Ethernet queue statistics
 */
struct sge_eth_stats {
	unsigned long pkts;		/* # of ethernet packets */
	unsigned long lro_pkts;		/* # of LRO super packets */
	unsigned long lro_merged;	/* # of wire packets merged by LRO */
	unsigned long rx_cso;		/* # of Rx checksum offloads */
	unsigned long vlan_ex;		/* # of Rx VLAN extractions */
	unsigned long rx_drops;		/* # of packets dropped due to no mem */
};

/*
 * State for an Ethernet Receive Queue.
 */
struct sge_eth_rxq {
	struct sge_rspq rspq;		/* Response Queue */
	struct sge_fl fl;		/* Free List */
	struct sge_eth_stats stats;	/* receive statistics */
};

/*
 * SGE Transmit Queue state.  This contains all of the resources associated
 * with the hardware status of a TX Queue which is a circular ring of hardware
 * TX Descriptors.  For convenience, it also contains a pointer to a parallel
 * "Software Descriptor" array but we don't know anything about it here other
 * than its type name.
 */
struct tx_desc {
	/*
	 * Egress Queues are measured in units of SGE_EQ_IDXSIZE by the
	 * hardware: Sizes, Producer and Consumer indices, etc.
	 */
	__be64 flit[SGE_EQ_IDXSIZE/sizeof(__be64)];
};
struct tx_sw_desc;
struct sge_txq {
	unsigned int in_use;		/* # of in-use TX descriptors */
	unsigned int size;		/* # of descriptors */
	unsigned int cidx;		/* SW consumer index */
	unsigned int pidx;		/* producer index */
	unsigned long stops;		/* # of times queue has been stopped */
	unsigned long restarts;		/* # of queue restarts */

	/*
	 * Write-once/infrequently fields.
	 * -------------------------------
	 */

	unsigned int cntxt_id;		/* SGE relative QID for the TX Q */
	unsigned int abs_id;		/* SGE absolute QID for the TX Q */
	struct tx_desc *desc;		/* address of HW TX descriptor ring */
	struct tx_sw_desc *sdesc;	/* address of SW TX descriptor ring */
	struct sge_qstat *stat;		/* queue status entry */
	dma_addr_t phys_addr;		/* PCI bus address of hardware ring */
};

/*
 * State for an Ethernet Transmit Queue.
 */
struct sge_eth_txq {
	struct sge_txq q;		/* SGE TX Queue */
	struct netdev_queue *txq;	/* associated netdev TX queue */
	unsigned long tso;		/* # of TSO requests */
	unsigned long tx_cso;		/* # of TX checksum offloads */
	unsigned long vlan_ins;		/* # of TX VLAN insertions */
	unsigned long mapping_err;	/* # of I/O MMU packet mapping errors */
};

/*
 * The complete set of Scatter/Gather Engine resources.
 */
struct sge {
	/*
	 * Our "Queue Sets" ...
	 */
	struct sge_eth_txq ethtxq[MAX_ETH_QSETS];
	struct sge_eth_rxq ethrxq[MAX_ETH_QSETS];

	/*
	 * Extra ingress queues for asynchronous firmware events and
	 * forwarded interrupts (when in MSI mode).
	 */
	struct sge_rspq fw_evtq ____cacheline_aligned_in_smp;

	struct sge_rspq intrq ____cacheline_aligned_in_smp;
	spinlock_t intrq_lock;

	/*
	 * State for managing "starving Free Lists" -- Free Lists which have
	 * fallen below a certain threshold of buffers available to the
	 * hardware and attempts to refill them up to that threshold have
	 * failed.  We have a regular "slow tick" timer process which will
	 * make periodic attempts to refill these starving Free Lists ...
	 */
	DECLARE_BITMAP(starving_fl, MAX_EGRQ);
	struct timer_list rx_timer;

	/*
	 * State for cleaning up completed TX descriptors.
	 */
	struct timer_list tx_timer;

	/*
	 * Write-once/infrequently fields.
	 * -------------------------------
	 */

	u16 max_ethqsets;		/* # of available Ethernet queue sets */
	u16 ethqsets;			/* # of active Ethernet queue sets */
	u16 ethtxq_rover;		/* Tx queue to clean up next */
	u16 timer_val[SGE_NTIMERS];	/* interrupt holdoff timer array */
	u8 counter_val[SGE_NCOUNTERS];	/* interrupt RX threshold array */

	/*
	 * Reverse maps from Absolute Queue IDs to associated queue pointers.
	 * The absolute Queue IDs are in a compact range which start at a
	 * [potentially large] Base Queue ID.  We perform the reverse map by
	 * first converting the Absolute Queue ID into a Relative Queue ID by
	 * subtracting off the Base Queue ID and then use a Relative Queue ID
	 * indexed table to get the pointer to the corresponding software
	 * queue structure.
	 */
	unsigned int egr_base;
	unsigned int ingr_base;
	void *egr_map[MAX_EGRQ];
	struct sge_rspq *ingr_map[MAX_INGQ];
};

/*
 * Utility macros to convert Absolute- to Relative-Queue indices and Egress-
 * and Ingress-Queues.  The EQ_MAP() and IQ_MAP() macros which provide
 * pointers to Ingress- and Egress-Queues can be used as both L- and R-values
 */
#define EQ_IDX(s, abs_id) ((unsigned int)((abs_id) - (s)->egr_base))
#define IQ_IDX(s, abs_id) ((unsigned int)((abs_id) - (s)->ingr_base))

#define EQ_MAP(s, abs_id) ((s)->egr_map[EQ_IDX(s, abs_id)])
#define IQ_MAP(s, abs_id) ((s)->ingr_map[IQ_IDX(s, abs_id)])

/*
 * Macro to iterate across Queue Sets ("rxq" is a historic misnomer).
 */
#define for_each_ethrxq(sge, iter) \
	for (iter = 0; iter < (sge)->ethqsets; iter++)

/*
 * Per-"adapter" (Virtual Function) information.
 */
struct adapter {
	/* PCI resources */
	void __iomem *regs;
	struct pci_dev *pdev;
	struct device *pdev_dev;

	/* "adapter" resources */
	unsigned long registered_device_map;
	unsigned long open_device_map;
	unsigned long flags;
	struct adapter_params params;

	/* queue and interrupt resources */
	struct {
		unsigned short vec;
		char desc[22];
	} msix_info[MSIX_ENTRIES];
	struct sge sge;

	/* Linux network device resources */
	struct net_device *port[MAX_NPORTS];
	const char *name;
	unsigned int msg_enable;

	/* debugfs resources */
	struct dentry *debugfs_root;

	/* various locks */
	spinlock_t stats_lock;
};

enum { /* adapter flags */
	FULL_INIT_DONE     = (1UL << 0),
	USING_MSI          = (1UL << 1),
	USING_MSIX         = (1UL << 2),
	QUEUES_BOUND       = (1UL << 3),
};

/*
 * The following register read/write routine definitions are required by
 * the common code.
 */

/**
 * t4_read_reg - read a HW register
 * @adapter: the adapter
 * @reg_addr: the register address
 *
 * Returns the 32-bit value of the given HW register.
 */
static inline u32 t4_read_reg(struct adapter *adapter, u32 reg_addr)
{
	return readl(adapter->regs + reg_addr);
}

/**
 * t4_write_reg - write a HW register
 * @adapter: the adapter
 * @reg_addr: the register address
 * @val: the value to write
 *
 * Write a 32-bit value into the given HW register.
 */
static inline void t4_write_reg(struct adapter *adapter, u32 reg_addr, u32 val)
{
	writel(val, adapter->regs + reg_addr);
}

#ifndef readq
static inline u64 readq(const volatile void __iomem *addr)
{
	return readl(addr) + ((u64)readl(addr + 4) << 32);
}

static inline void writeq(u64 val, volatile void __iomem *addr)
{
	writel(val, addr);
	writel(val >> 32, addr + 4);
}
#endif

/**
 * t4_read_reg64 - read a 64-bit HW register
 * @adapter: the adapter
 * @reg_addr: the register address
 *
 * Returns the 64-bit value of the given HW register.
 */
static inline u64 t4_read_reg64(struct adapter *adapter, u32 reg_addr)
{
	return readq(adapter->regs + reg_addr);
}

/**
 * t4_write_reg64 - write a 64-bit HW register
 * @adapter: the adapter
 * @reg_addr: the register address
 * @val: the value to write
 *
 * Write a 64-bit value into the given HW register.
 */
static inline void t4_write_reg64(struct adapter *adapter, u32 reg_addr,
				  u64 val)
{
	writeq(val, adapter->regs + reg_addr);
}

/**
 * port_name - return the string name of a port
 * @adapter: the adapter
 * @pidx: the port index
 *
 * Return the string name of the selected port.
 */
static inline const char *port_name(struct adapter *adapter, int pidx)
{
	return adapter->port[pidx]->name;
}

/**
 * t4_os_set_hw_addr - store a port's MAC address in SW
 * @adapter: the adapter
 * @pidx: the port index
 * @hw_addr: the Ethernet address
 *
 * Store the Ethernet address of the given port in SW.  Called by the common
 * code when it retrieves a port's Ethernet address from EEPROM.
 */
static inline void t4_os_set_hw_addr(struct adapter *adapter, int pidx,
				     u8 hw_addr[])
{
	memcpy(adapter->port[pidx]->dev_addr, hw_addr, ETH_ALEN);
	memcpy(adapter->port[pidx]->perm_addr, hw_addr, ETH_ALEN);
}

/**
 * netdev2pinfo - return the port_info structure associated with a net_device
 * @dev: the netdev
 *
 * Return the struct port_info associated with a net_device
 */
static inline struct port_info *netdev2pinfo(const struct net_device *dev)
{
	return netdev_priv(dev);
}

/**
 * adap2pinfo - return the port_info of a port
 * @adap: the adapter
 * @pidx: the port index
 *
 * Return the port_info structure for the adapter.
 */
static inline struct port_info *adap2pinfo(struct adapter *adapter, int pidx)
{
	return netdev_priv(adapter->port[pidx]);
}

/**
 * netdev2adap - return the adapter structure associated with a net_device
 * @dev: the netdev
 *
 * Return the struct adapter associated with a net_device
 */
static inline struct adapter *netdev2adap(const struct net_device *dev)
{
	return netdev2pinfo(dev)->adapter;
}

/*
 * OS "Callback" function declarations.  These are functions that the OS code
 * is "contracted" to provide for the common code.
 */
void t4vf_os_link_changed(struct adapter *, int, int);

/*
 * SGE function prototype declarations.
 */
int t4vf_sge_alloc_rxq(struct adapter *, struct sge_rspq *, bool,
		       struct net_device *, int,
		       struct sge_fl *, rspq_handler_t);
int t4vf_sge_alloc_eth_txq(struct adapter *, struct sge_eth_txq *,
			   struct net_device *, struct netdev_queue *,
			   unsigned int);
void t4vf_free_sge_resources(struct adapter *);

int t4vf_eth_xmit(struct sk_buff *, struct net_device *);
int t4vf_ethrx_handler(struct sge_rspq *, const __be64 *,
		       const struct pkt_gl *);

irq_handler_t t4vf_intr_handler(struct adapter *);
irqreturn_t t4vf_sge_intr_msix(int, void *);

int t4vf_sge_init(struct adapter *);
void t4vf_sge_start(struct adapter *);
void t4vf_sge_stop(struct adapter *);

#endif /* __CXGB4VF_ADAPTER_H__ */