1 /*************************************************************************
2  * myri10ge.c: Myricom Myri-10G Ethernet driver.
3  *
4  * Copyright (C) 2005 - 2011 Myricom, Inc.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of Myricom, Inc. nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  *
31  *
32  * If the eeprom on your board is not recent enough, you will need to get a
33  * newer firmware image at:
34  *   http://www.myri.com/scs/download-Myri10GE.html
35  *
36  * Contact Information:
37  *   <help@myri.com>
38  *   Myricom, Inc., 325N Santa Anita Avenue, Arcadia, CA 91006
39  *************************************************************************/
40 
41 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
42 
43 #include <linux/tcp.h>
44 #include <linux/netdevice.h>
45 #include <linux/skbuff.h>
46 #include <linux/string.h>
47 #include <linux/module.h>
48 #include <linux/pci.h>
49 #include <linux/dma-mapping.h>
50 #include <linux/etherdevice.h>
51 #include <linux/if_ether.h>
52 #include <linux/if_vlan.h>
53 #include <linux/dca.h>
54 #include <linux/ip.h>
55 #include <linux/inet.h>
56 #include <linux/in.h>
57 #include <linux/ethtool.h>
58 #include <linux/firmware.h>
59 #include <linux/delay.h>
60 #include <linux/timer.h>
61 #include <linux/vmalloc.h>
62 #include <linux/crc32.h>
63 #include <linux/moduleparam.h>
64 #include <linux/io.h>
65 #include <linux/log2.h>
66 #include <linux/slab.h>
67 #include <linux/prefetch.h>
68 #include <net/checksum.h>
69 #include <net/ip.h>
70 #include <net/tcp.h>
71 #include <asm/byteorder.h>
72 #include <asm/processor.h>
73 
74 #include "myri10ge_mcp.h"
75 #include "myri10ge_mcp_gen_header.h"
76 
77 #define MYRI10GE_VERSION_STR "1.5.3-1.534"
78 
79 MODULE_DESCRIPTION("Myricom 10G driver (10GbE)");
80 MODULE_AUTHOR("Maintainer: help@myri.com");
81 MODULE_VERSION(MYRI10GE_VERSION_STR);
82 MODULE_LICENSE("Dual BSD/GPL");
83 
84 #define MYRI10GE_MAX_ETHER_MTU 9014
85 
86 #define MYRI10GE_ETH_STOPPED 0
87 #define MYRI10GE_ETH_STOPPING 1
88 #define MYRI10GE_ETH_STARTING 2
89 #define MYRI10GE_ETH_RUNNING 3
90 #define MYRI10GE_ETH_OPEN_FAILED 4
91 
92 #define MYRI10GE_EEPROM_STRINGS_SIZE 256
93 #define MYRI10GE_MAX_SEND_DESC_TSO ((65536 / 2048) * 2)
94 
95 #define MYRI10GE_NO_CONFIRM_DATA htonl(0xffffffff)
96 #define MYRI10GE_NO_RESPONSE_RESULT 0xffffffff
97 
98 #define MYRI10GE_ALLOC_ORDER 0
99 #define MYRI10GE_ALLOC_SIZE ((1 << MYRI10GE_ALLOC_ORDER) * PAGE_SIZE)
100 #define MYRI10GE_MAX_FRAGS_PER_FRAME (MYRI10GE_MAX_ETHER_MTU/MYRI10GE_ALLOC_SIZE + 1)
101 
102 #define MYRI10GE_MAX_SLICES 32
103 
104 struct myri10ge_rx_buffer_state {
105 	struct page *page;
106 	int page_offset;
107 	DEFINE_DMA_UNMAP_ADDR(bus);
108 	DEFINE_DMA_UNMAP_LEN(len);
109 };
110 
111 struct myri10ge_tx_buffer_state {
112 	struct sk_buff *skb;
113 	int last;
114 	DEFINE_DMA_UNMAP_ADDR(bus);
115 	DEFINE_DMA_UNMAP_LEN(len);
116 };
117 
118 struct myri10ge_cmd {
119 	u32 data0;
120 	u32 data1;
121 	u32 data2;
122 };
123 
124 struct myri10ge_rx_buf {
125 	struct mcp_kreq_ether_recv __iomem *lanai;	/* lanai ptr for recv ring */
126 	struct mcp_kreq_ether_recv *shadow;	/* host shadow of recv ring */
127 	struct myri10ge_rx_buffer_state *info;
128 	struct page *page;
129 	dma_addr_t bus;
130 	int page_offset;
131 	int cnt;
132 	int fill_cnt;
133 	int alloc_fail;
134 	int mask;		/* number of rx slots -1 */
135 	int watchdog_needed;
136 };
137 
138 struct myri10ge_tx_buf {
139 	struct mcp_kreq_ether_send __iomem *lanai;	/* lanai ptr for sendq */
140 	__be32 __iomem *send_go;	/* "go" doorbell ptr */
141 	__be32 __iomem *send_stop;	/* "stop" doorbell ptr */
142 	struct mcp_kreq_ether_send *req_list;	/* host shadow of sendq */
143 	char *req_bytes;
144 	struct myri10ge_tx_buffer_state *info;
145 	int mask;		/* number of transmit slots -1  */
146 	int req ____cacheline_aligned;	/* transmit slots submitted     */
147 	int pkt_start;		/* packets started */
148 	int stop_queue;
149 	int linearized;
150 	int done ____cacheline_aligned;	/* transmit slots completed     */
151 	int pkt_done;		/* packets completed */
152 	int wake_queue;
153 	int queue_active;
154 };
155 
156 struct myri10ge_rx_done {
157 	struct mcp_slot *entry;
158 	dma_addr_t bus;
159 	int cnt;
160 	int idx;
161 };
162 
163 struct myri10ge_slice_netstats {
164 	unsigned long rx_packets;
165 	unsigned long tx_packets;
166 	unsigned long rx_bytes;
167 	unsigned long tx_bytes;
168 	unsigned long rx_dropped;
169 	unsigned long tx_dropped;
170 };
171 
172 struct myri10ge_slice_state {
173 	struct myri10ge_tx_buf tx;	/* transmit ring        */
174 	struct myri10ge_rx_buf rx_small;
175 	struct myri10ge_rx_buf rx_big;
176 	struct myri10ge_rx_done rx_done;
177 	struct net_device *dev;
178 	struct napi_struct napi;
179 	struct myri10ge_priv *mgp;
180 	struct myri10ge_slice_netstats stats;
181 	__be32 __iomem *irq_claim;
182 	struct mcp_irq_data *fw_stats;
183 	dma_addr_t fw_stats_bus;
184 	int watchdog_tx_done;
185 	int watchdog_tx_req;
186 	int watchdog_rx_done;
187 	int stuck;
188 #ifdef CONFIG_MYRI10GE_DCA
189 	int cached_dca_tag;
190 	int cpu;
191 	__be32 __iomem *dca_tag;
192 #endif
193 	char irq_desc[32];
194 };
195 
196 struct myri10ge_priv {
197 	struct myri10ge_slice_state *ss;
198 	int tx_boundary;	/* boundary transmits cannot cross */
199 	int num_slices;
200 	int running;		/* running?             */
201 	int small_bytes;
202 	int big_bytes;
203 	int max_intr_slots;
204 	struct net_device *dev;
205 	u8 __iomem *sram;
206 	int sram_size;
207 	unsigned long board_span;
208 	unsigned long iomem_base;
209 	__be32 __iomem *irq_deassert;
210 	char *mac_addr_string;
211 	struct mcp_cmd_response *cmd;
212 	dma_addr_t cmd_bus;
213 	struct pci_dev *pdev;
214 	int msi_enabled;
215 	int msix_enabled;
216 	struct msix_entry *msix_vectors;
217 #ifdef CONFIG_MYRI10GE_DCA
218 	int dca_enabled;
219 	int relaxed_order;
220 #endif
221 	u32 link_state;
222 	unsigned int rdma_tags_available;
223 	int intr_coal_delay;
224 	__be32 __iomem *intr_coal_delay_ptr;
225 	int wc_cookie;
226 	int down_cnt;
227 	wait_queue_head_t down_wq;
228 	struct work_struct watchdog_work;
229 	struct timer_list watchdog_timer;
230 	int watchdog_resets;
231 	int watchdog_pause;
232 	int pause;
233 	bool fw_name_allocated;
234 	char *fw_name;
235 	char eeprom_strings[MYRI10GE_EEPROM_STRINGS_SIZE];
236 	char *product_code_string;
237 	char fw_version[128];
238 	int fw_ver_major;
239 	int fw_ver_minor;
240 	int fw_ver_tiny;
241 	int adopted_rx_filter_bug;
242 	u8 mac_addr[ETH_ALEN];		/* eeprom mac address */
243 	unsigned long serial_number;
244 	int vendor_specific_offset;
245 	int fw_multicast_support;
246 	u32 features;
247 	u32 max_tso6;
248 	u32 read_dma;
249 	u32 write_dma;
250 	u32 read_write_dma;
251 	u32 link_changes;
252 	u32 msg_enable;
253 	unsigned int board_number;
254 	int rebooted;
255 };
256 
257 static char *myri10ge_fw_unaligned = "myri10ge_ethp_z8e.dat";
258 static char *myri10ge_fw_aligned = "myri10ge_eth_z8e.dat";
259 static char *myri10ge_fw_rss_unaligned = "myri10ge_rss_ethp_z8e.dat";
260 static char *myri10ge_fw_rss_aligned = "myri10ge_rss_eth_z8e.dat";
261 MODULE_FIRMWARE("myri10ge_ethp_z8e.dat");
262 MODULE_FIRMWARE("myri10ge_eth_z8e.dat");
263 MODULE_FIRMWARE("myri10ge_rss_ethp_z8e.dat");
264 MODULE_FIRMWARE("myri10ge_rss_eth_z8e.dat");
265 
266 /* Careful: must be accessed under kernel_param_lock() */
267 static char *myri10ge_fw_name = NULL;
268 module_param(myri10ge_fw_name, charp, 0644);
269 MODULE_PARM_DESC(myri10ge_fw_name, "Firmware image name");
270 
271 #define MYRI10GE_MAX_BOARDS 8
272 static char *myri10ge_fw_names[MYRI10GE_MAX_BOARDS] =
273     {[0 ... (MYRI10GE_MAX_BOARDS - 1)] = NULL };
274 module_param_array_named(myri10ge_fw_names, myri10ge_fw_names, charp, NULL,
275 			 0444);
276 MODULE_PARM_DESC(myri10ge_fw_names, "Firmware image names per board");
277 
278 static int myri10ge_ecrc_enable = 1;
279 module_param(myri10ge_ecrc_enable, int, 0444);
280 MODULE_PARM_DESC(myri10ge_ecrc_enable, "Enable Extended CRC on PCI-E");
281 
282 static int myri10ge_small_bytes = -1;	/* -1 == auto */
283 module_param(myri10ge_small_bytes, int, 0644);
284 MODULE_PARM_DESC(myri10ge_small_bytes, "Threshold of small packets");
285 
286 static int myri10ge_msi = 1;	/* enable msi by default */
287 module_param(myri10ge_msi, int, 0644);
288 MODULE_PARM_DESC(myri10ge_msi, "Enable Message Signalled Interrupts");
289 
290 static int myri10ge_intr_coal_delay = 75;
291 module_param(myri10ge_intr_coal_delay, int, 0444);
292 MODULE_PARM_DESC(myri10ge_intr_coal_delay, "Interrupt coalescing delay");
293 
294 static int myri10ge_flow_control = 1;
295 module_param(myri10ge_flow_control, int, 0444);
296 MODULE_PARM_DESC(myri10ge_flow_control, "Pause parameter");
297 
298 static int myri10ge_deassert_wait = 1;
299 module_param(myri10ge_deassert_wait, int, 0644);
300 MODULE_PARM_DESC(myri10ge_deassert_wait,
301 		 "Wait when deasserting legacy interrupts");
302 
303 static int myri10ge_force_firmware = 0;
304 module_param(myri10ge_force_firmware, int, 0444);
305 MODULE_PARM_DESC(myri10ge_force_firmware,
306 		 "Force firmware to assume aligned completions");
307 
308 static int myri10ge_initial_mtu = MYRI10GE_MAX_ETHER_MTU - ETH_HLEN;
309 module_param(myri10ge_initial_mtu, int, 0444);
310 MODULE_PARM_DESC(myri10ge_initial_mtu, "Initial MTU");
311 
312 static int myri10ge_napi_weight = 64;
313 module_param(myri10ge_napi_weight, int, 0444);
314 MODULE_PARM_DESC(myri10ge_napi_weight, "Set NAPI weight");
315 
316 static int myri10ge_watchdog_timeout = 1;
317 module_param(myri10ge_watchdog_timeout, int, 0444);
318 MODULE_PARM_DESC(myri10ge_watchdog_timeout, "Set watchdog timeout");
319 
320 static int myri10ge_max_irq_loops = 1048576;
321 module_param(myri10ge_max_irq_loops, int, 0444);
322 MODULE_PARM_DESC(myri10ge_max_irq_loops,
323 		 "Set stuck legacy IRQ detection threshold");
324 
325 #define MYRI10GE_MSG_DEFAULT NETIF_MSG_LINK
326 
327 static int myri10ge_debug = -1;	/* defaults above */
328 module_param(myri10ge_debug, int, 0);
329 MODULE_PARM_DESC(myri10ge_debug, "Debug level (0=none,...,16=all)");
330 
331 static int myri10ge_fill_thresh = 256;
332 module_param(myri10ge_fill_thresh, int, 0644);
333 MODULE_PARM_DESC(myri10ge_fill_thresh, "Number of empty rx slots allowed");
334 
335 static int myri10ge_reset_recover = 1;
336 
337 static int myri10ge_max_slices = 1;
338 module_param(myri10ge_max_slices, int, 0444);
339 MODULE_PARM_DESC(myri10ge_max_slices, "Max tx/rx queues");
340 
341 static int myri10ge_rss_hash = MXGEFW_RSS_HASH_TYPE_SRC_DST_PORT;
342 module_param(myri10ge_rss_hash, int, 0444);
343 MODULE_PARM_DESC(myri10ge_rss_hash, "Type of RSS hashing to do");
344 
345 static int myri10ge_dca = 1;
346 module_param(myri10ge_dca, int, 0444);
347 MODULE_PARM_DESC(myri10ge_dca, "Enable DCA if possible");
348 
349 #define MYRI10GE_FW_OFFSET 1024*1024
350 #define MYRI10GE_HIGHPART_TO_U32(X) \
351 (sizeof (X) == 8) ? ((u32)((u64)(X) >> 32)) : (0)
352 #define MYRI10GE_LOWPART_TO_U32(X) ((u32)(X))
353 
354 #define myri10ge_pio_copy(to,from,size) __iowrite64_copy(to,from,size/8)
355 
356 static void myri10ge_set_multicast_list(struct net_device *dev);
357 static netdev_tx_t myri10ge_sw_tso(struct sk_buff *skb,
358 					 struct net_device *dev);
359 
360 static inline void put_be32(__be32 val, __be32 __iomem * p)
361 {
362 	__raw_writel((__force __u32) val, (__force void __iomem *)p);
363 }
364 
365 static void myri10ge_get_stats(struct net_device *dev,
366 			       struct rtnl_link_stats64 *stats);
367 
368 static void set_fw_name(struct myri10ge_priv *mgp, char *name, bool allocated)
369 {
370 	if (mgp->fw_name_allocated)
371 		kfree(mgp->fw_name);
372 	mgp->fw_name = name;
373 	mgp->fw_name_allocated = allocated;
374 }
375 
376 static int
377 myri10ge_send_cmd(struct myri10ge_priv *mgp, u32 cmd,
378 		  struct myri10ge_cmd *data, int atomic)
379 {
380 	struct mcp_cmd *buf;
381 	char buf_bytes[sizeof(*buf) + 8];
382 	struct mcp_cmd_response *response = mgp->cmd;
383 	char __iomem *cmd_addr = mgp->sram + MXGEFW_ETH_CMD;
384 	u32 dma_low, dma_high, result, value;
385 	int sleep_total = 0;
386 
387 	/* ensure buf is aligned to 8 bytes */
388 	buf = (struct mcp_cmd *)ALIGN((unsigned long)buf_bytes, 8);
389 
390 	buf->data0 = htonl(data->data0);
391 	buf->data1 = htonl(data->data1);
392 	buf->data2 = htonl(data->data2);
393 	buf->cmd = htonl(cmd);
394 	dma_low = MYRI10GE_LOWPART_TO_U32(mgp->cmd_bus);
395 	dma_high = MYRI10GE_HIGHPART_TO_U32(mgp->cmd_bus);
396 
397 	buf->response_addr.low = htonl(dma_low);
398 	buf->response_addr.high = htonl(dma_high);
399 	response->result = htonl(MYRI10GE_NO_RESPONSE_RESULT);
400 	mb();
401 	myri10ge_pio_copy(cmd_addr, buf, sizeof(*buf));
402 
403 	/* wait up to 15ms. Longest command is the DMA benchmark,
404 	 * which is capped at 5ms, but runs from a timeout handler
405 	 * that runs every 7.8ms. So a 15ms timeout leaves us with
406 	 * a 2.2ms margin
407 	 */
408 	if (atomic) {
409 		/* if atomic is set, do not sleep,
410 		 * and try to get the completion quickly
411 		 * (1ms will be enough for those commands) */
412 		for (sleep_total = 0;
413 		     sleep_total < 1000 &&
414 		     response->result == htonl(MYRI10GE_NO_RESPONSE_RESULT);
415 		     sleep_total += 10) {
416 			udelay(10);
417 			mb();
418 		}
419 	} else {
420 		/* use msleep for most command */
421 		for (sleep_total = 0;
422 		     sleep_total < 15 &&
423 		     response->result == htonl(MYRI10GE_NO_RESPONSE_RESULT);
424 		     sleep_total++)
425 			msleep(1);
426 	}
427 
428 	result = ntohl(response->result);
429 	value = ntohl(response->data);
430 	if (result != MYRI10GE_NO_RESPONSE_RESULT) {
431 		if (result == 0) {
432 			data->data0 = value;
433 			return 0;
434 		} else if (result == MXGEFW_CMD_UNKNOWN) {
435 			return -ENOSYS;
436 		} else if (result == MXGEFW_CMD_ERROR_UNALIGNED) {
437 			return -E2BIG;
438 		} else if (result == MXGEFW_CMD_ERROR_RANGE &&
439 			   cmd == MXGEFW_CMD_ENABLE_RSS_QUEUES &&
440 			   (data->
441 			    data1 & MXGEFW_SLICE_ENABLE_MULTIPLE_TX_QUEUES) !=
442 			   0) {
443 			return -ERANGE;
444 		} else {
445 			dev_err(&mgp->pdev->dev,
446 				"command %d failed, result = %d\n",
447 				cmd, result);
448 			return -ENXIO;
449 		}
450 	}
451 
452 	dev_err(&mgp->pdev->dev, "command %d timed out, result = %d\n",
453 		cmd, result);
454 	return -EAGAIN;
455 }
456 
457 /*
458  * The eeprom strings on the lanaiX have the format
459  * SN=x\0
460  * MAC=x:x:x:x:x:x\0
461  * PT:ddd mmm xx xx:xx:xx xx\0
462  * PV:ddd mmm xx xx:xx:xx xx\0
463  */
464 static int myri10ge_read_mac_addr(struct myri10ge_priv *mgp)
465 {
466 	char *ptr, *limit;
467 	int i;
468 
469 	ptr = mgp->eeprom_strings;
470 	limit = mgp->eeprom_strings + MYRI10GE_EEPROM_STRINGS_SIZE;
471 
472 	while (*ptr != '\0' && ptr < limit) {
473 		if (memcmp(ptr, "MAC=", 4) == 0) {
474 			ptr += 4;
475 			mgp->mac_addr_string = ptr;
476 			for (i = 0; i < 6; i++) {
477 				if ((ptr + 2) > limit)
478 					goto abort;
479 				mgp->mac_addr[i] =
480 				    simple_strtoul(ptr, &ptr, 16);
481 				ptr += 1;
482 			}
483 		}
484 		if (memcmp(ptr, "PC=", 3) == 0) {
485 			ptr += 3;
486 			mgp->product_code_string = ptr;
487 		}
488 		if (memcmp((const void *)ptr, "SN=", 3) == 0) {
489 			ptr += 3;
490 			mgp->serial_number = simple_strtoul(ptr, &ptr, 10);
491 		}
492 		while (ptr < limit && *ptr++) ;
493 	}
494 
495 	return 0;
496 
497 abort:
498 	dev_err(&mgp->pdev->dev, "failed to parse eeprom_strings\n");
499 	return -ENXIO;
500 }
501 
502 /*
503  * Enable or disable periodic RDMAs from the host to make certain
504  * chipsets resend dropped PCIe messages
505  */
506 
507 static void myri10ge_dummy_rdma(struct myri10ge_priv *mgp, int enable)
508 {
509 	char __iomem *submit;
510 	__be32 buf[16] __attribute__ ((__aligned__(8)));
511 	u32 dma_low, dma_high;
512 	int i;
513 
514 	/* clear confirmation addr */
515 	mgp->cmd->data = 0;
516 	mb();
517 
518 	/* send a rdma command to the PCIe engine, and wait for the
519 	 * response in the confirmation address.  The firmware should
520 	 * write a -1 there to indicate it is alive and well
521 	 */
522 	dma_low = MYRI10GE_LOWPART_TO_U32(mgp->cmd_bus);
523 	dma_high = MYRI10GE_HIGHPART_TO_U32(mgp->cmd_bus);
524 
525 	buf[0] = htonl(dma_high);	/* confirm addr MSW */
526 	buf[1] = htonl(dma_low);	/* confirm addr LSW */
527 	buf[2] = MYRI10GE_NO_CONFIRM_DATA;	/* confirm data */
528 	buf[3] = htonl(dma_high);	/* dummy addr MSW */
529 	buf[4] = htonl(dma_low);	/* dummy addr LSW */
530 	buf[5] = htonl(enable);	/* enable? */
531 
532 	submit = mgp->sram + MXGEFW_BOOT_DUMMY_RDMA;
533 
534 	myri10ge_pio_copy(submit, &buf, sizeof(buf));
535 	for (i = 0; mgp->cmd->data != MYRI10GE_NO_CONFIRM_DATA && i < 20; i++)
536 		msleep(1);
537 	if (mgp->cmd->data != MYRI10GE_NO_CONFIRM_DATA)
538 		dev_err(&mgp->pdev->dev, "dummy rdma %s failed\n",
539 			(enable ? "enable" : "disable"));
540 }
541 
542 static int
543 myri10ge_validate_firmware(struct myri10ge_priv *mgp,
544 			   struct mcp_gen_header *hdr)
545 {
546 	struct device *dev = &mgp->pdev->dev;
547 
548 	/* check firmware type */
549 	if (ntohl(hdr->mcp_type) != MCP_TYPE_ETH) {
550 		dev_err(dev, "Bad firmware type: 0x%x\n", ntohl(hdr->mcp_type));
551 		return -EINVAL;
552 	}
553 
554 	/* save firmware version for ethtool */
555 	strncpy(mgp->fw_version, hdr->version, sizeof(mgp->fw_version));
556 	mgp->fw_version[sizeof(mgp->fw_version) - 1] = '\0';
557 
558 	sscanf(mgp->fw_version, "%d.%d.%d", &mgp->fw_ver_major,
559 	       &mgp->fw_ver_minor, &mgp->fw_ver_tiny);
560 
561 	if (!(mgp->fw_ver_major == MXGEFW_VERSION_MAJOR &&
562 	      mgp->fw_ver_minor == MXGEFW_VERSION_MINOR)) {
563 		dev_err(dev, "Found firmware version %s\n", mgp->fw_version);
564 		dev_err(dev, "Driver needs %d.%d\n", MXGEFW_VERSION_MAJOR,
565 			MXGEFW_VERSION_MINOR);
566 		return -EINVAL;
567 	}
568 	return 0;
569 }
570 
571 static int myri10ge_load_hotplug_firmware(struct myri10ge_priv *mgp, u32 * size)
572 {
573 	unsigned crc, reread_crc;
574 	const struct firmware *fw;
575 	struct device *dev = &mgp->pdev->dev;
576 	unsigned char *fw_readback;
577 	struct mcp_gen_header *hdr;
578 	size_t hdr_offset;
579 	int status;
580 	unsigned i;
581 
582 	if (request_firmware(&fw, mgp->fw_name, dev) < 0) {
583 		dev_err(dev, "Unable to load %s firmware image via hotplug\n",
584 			mgp->fw_name);
585 		status = -EINVAL;
586 		goto abort_with_nothing;
587 	}
588 
589 	/* check size */
590 
591 	if (fw->size >= mgp->sram_size - MYRI10GE_FW_OFFSET ||
592 	    fw->size < MCP_HEADER_PTR_OFFSET + 4) {
593 		dev_err(dev, "Firmware size invalid:%d\n", (int)fw->size);
594 		status = -EINVAL;
595 		goto abort_with_fw;
596 	}
597 
598 	/* check id */
599 	hdr_offset = ntohl(*(__be32 *) (fw->data + MCP_HEADER_PTR_OFFSET));
600 	if ((hdr_offset & 3) || hdr_offset + sizeof(*hdr) > fw->size) {
601 		dev_err(dev, "Bad firmware file\n");
602 		status = -EINVAL;
603 		goto abort_with_fw;
604 	}
605 	hdr = (void *)(fw->data + hdr_offset);
606 
607 	status = myri10ge_validate_firmware(mgp, hdr);
608 	if (status != 0)
609 		goto abort_with_fw;
610 
611 	crc = crc32(~0, fw->data, fw->size);
612 	for (i = 0; i < fw->size; i += 256) {
613 		myri10ge_pio_copy(mgp->sram + MYRI10GE_FW_OFFSET + i,
614 				  fw->data + i,
615 				  min(256U, (unsigned)(fw->size - i)));
616 		mb();
617 		readb(mgp->sram);
618 	}
619 	fw_readback = vmalloc(fw->size);
620 	if (!fw_readback) {
621 		status = -ENOMEM;
622 		goto abort_with_fw;
623 	}
624 	/* corruption checking is good for parity recovery and buggy chipset */
625 	memcpy_fromio(fw_readback, mgp->sram + MYRI10GE_FW_OFFSET, fw->size);
626 	reread_crc = crc32(~0, fw_readback, fw->size);
627 	vfree(fw_readback);
628 	if (crc != reread_crc) {
629 		dev_err(dev, "CRC failed(fw-len=%u), got 0x%x (expect 0x%x)\n",
630 			(unsigned)fw->size, reread_crc, crc);
631 		status = -EIO;
632 		goto abort_with_fw;
633 	}
634 	*size = (u32) fw->size;
635 
636 abort_with_fw:
637 	release_firmware(fw);
638 
639 abort_with_nothing:
640 	return status;
641 }
642 
643 static int myri10ge_adopt_running_firmware(struct myri10ge_priv *mgp)
644 {
645 	struct mcp_gen_header *hdr;
646 	struct device *dev = &mgp->pdev->dev;
647 	const size_t bytes = sizeof(struct mcp_gen_header);
648 	size_t hdr_offset;
649 	int status;
650 
651 	/* find running firmware header */
652 	hdr_offset = swab32(readl(mgp->sram + MCP_HEADER_PTR_OFFSET));
653 
654 	if ((hdr_offset & 3) || hdr_offset + sizeof(*hdr) > mgp->sram_size) {
655 		dev_err(dev, "Running firmware has bad header offset (%d)\n",
656 			(int)hdr_offset);
657 		return -EIO;
658 	}
659 
660 	/* copy header of running firmware from SRAM to host memory to
661 	 * validate firmware */
662 	hdr = kmalloc(bytes, GFP_KERNEL);
663 	if (hdr == NULL)
664 		return -ENOMEM;
665 
666 	memcpy_fromio(hdr, mgp->sram + hdr_offset, bytes);
667 	status = myri10ge_validate_firmware(mgp, hdr);
668 	kfree(hdr);
669 
670 	/* check to see if adopted firmware has bug where adopting
671 	 * it will cause broadcasts to be filtered unless the NIC
672 	 * is kept in ALLMULTI mode */
673 	if (mgp->fw_ver_major == 1 && mgp->fw_ver_minor == 4 &&
674 	    mgp->fw_ver_tiny >= 4 && mgp->fw_ver_tiny <= 11) {
675 		mgp->adopted_rx_filter_bug = 1;
676 		dev_warn(dev, "Adopting fw %d.%d.%d: "
677 			 "working around rx filter bug\n",
678 			 mgp->fw_ver_major, mgp->fw_ver_minor,
679 			 mgp->fw_ver_tiny);
680 	}
681 	return status;
682 }
683 
684 static int myri10ge_get_firmware_capabilities(struct myri10ge_priv *mgp)
685 {
686 	struct myri10ge_cmd cmd;
687 	int status;
688 
689 	/* probe for IPv6 TSO support */
690 	mgp->features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_TSO;
691 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_MAX_TSO6_HDR_SIZE,
692 				   &cmd, 0);
693 	if (status == 0) {
694 		mgp->max_tso6 = cmd.data0;
695 		mgp->features |= NETIF_F_TSO6;
696 	}
697 
698 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_RX_RING_SIZE, &cmd, 0);
699 	if (status != 0) {
700 		dev_err(&mgp->pdev->dev,
701 			"failed MXGEFW_CMD_GET_RX_RING_SIZE\n");
702 		return -ENXIO;
703 	}
704 
705 	mgp->max_intr_slots = 2 * (cmd.data0 / sizeof(struct mcp_dma_addr));
706 
707 	return 0;
708 }
709 
710 static int myri10ge_load_firmware(struct myri10ge_priv *mgp, int adopt)
711 {
712 	char __iomem *submit;
713 	__be32 buf[16] __attribute__ ((__aligned__(8)));
714 	u32 dma_low, dma_high, size;
715 	int status, i;
716 
717 	size = 0;
718 	status = myri10ge_load_hotplug_firmware(mgp, &size);
719 	if (status) {
720 		if (!adopt)
721 			return status;
722 		dev_warn(&mgp->pdev->dev, "hotplug firmware loading failed\n");
723 
724 		/* Do not attempt to adopt firmware if there
725 		 * was a bad crc */
726 		if (status == -EIO)
727 			return status;
728 
729 		status = myri10ge_adopt_running_firmware(mgp);
730 		if (status != 0) {
731 			dev_err(&mgp->pdev->dev,
732 				"failed to adopt running firmware\n");
733 			return status;
734 		}
735 		dev_info(&mgp->pdev->dev,
736 			 "Successfully adopted running firmware\n");
737 		if (mgp->tx_boundary == 4096) {
738 			dev_warn(&mgp->pdev->dev,
739 				 "Using firmware currently running on NIC"
740 				 ".  For optimal\n");
741 			dev_warn(&mgp->pdev->dev,
742 				 "performance consider loading optimized "
743 				 "firmware\n");
744 			dev_warn(&mgp->pdev->dev, "via hotplug\n");
745 		}
746 
747 		set_fw_name(mgp, "adopted", false);
748 		mgp->tx_boundary = 2048;
749 		myri10ge_dummy_rdma(mgp, 1);
750 		status = myri10ge_get_firmware_capabilities(mgp);
751 		return status;
752 	}
753 
754 	/* clear confirmation addr */
755 	mgp->cmd->data = 0;
756 	mb();
757 
758 	/* send a reload command to the bootstrap MCP, and wait for the
759 	 *  response in the confirmation address.  The firmware should
760 	 * write a -1 there to indicate it is alive and well
761 	 */
762 	dma_low = MYRI10GE_LOWPART_TO_U32(mgp->cmd_bus);
763 	dma_high = MYRI10GE_HIGHPART_TO_U32(mgp->cmd_bus);
764 
765 	buf[0] = htonl(dma_high);	/* confirm addr MSW */
766 	buf[1] = htonl(dma_low);	/* confirm addr LSW */
767 	buf[2] = MYRI10GE_NO_CONFIRM_DATA;	/* confirm data */
768 
769 	/* FIX: All newest firmware should un-protect the bottom of
770 	 * the sram before handoff. However, the very first interfaces
771 	 * do not. Therefore the handoff copy must skip the first 8 bytes
772 	 */
773 	buf[3] = htonl(MYRI10GE_FW_OFFSET + 8);	/* where the code starts */
774 	buf[4] = htonl(size - 8);	/* length of code */
775 	buf[5] = htonl(8);	/* where to copy to */
776 	buf[6] = htonl(0);	/* where to jump to */
777 
778 	submit = mgp->sram + MXGEFW_BOOT_HANDOFF;
779 
780 	myri10ge_pio_copy(submit, &buf, sizeof(buf));
781 	mb();
782 	msleep(1);
783 	mb();
784 	i = 0;
785 	while (mgp->cmd->data != MYRI10GE_NO_CONFIRM_DATA && i < 9) {
786 		msleep(1 << i);
787 		i++;
788 	}
789 	if (mgp->cmd->data != MYRI10GE_NO_CONFIRM_DATA) {
790 		dev_err(&mgp->pdev->dev, "handoff failed\n");
791 		return -ENXIO;
792 	}
793 	myri10ge_dummy_rdma(mgp, 1);
794 	status = myri10ge_get_firmware_capabilities(mgp);
795 
796 	return status;
797 }
798 
799 static int myri10ge_update_mac_address(struct myri10ge_priv *mgp,
800 				       const u8 * addr)
801 {
802 	struct myri10ge_cmd cmd;
803 	int status;
804 
805 	cmd.data0 = ((addr[0] << 24) | (addr[1] << 16)
806 		     | (addr[2] << 8) | addr[3]);
807 
808 	cmd.data1 = ((addr[4] << 8) | (addr[5]));
809 
810 	status = myri10ge_send_cmd(mgp, MXGEFW_SET_MAC_ADDRESS, &cmd, 0);
811 	return status;
812 }
813 
814 static int myri10ge_change_pause(struct myri10ge_priv *mgp, int pause)
815 {
816 	struct myri10ge_cmd cmd;
817 	int status, ctl;
818 
819 	ctl = pause ? MXGEFW_ENABLE_FLOW_CONTROL : MXGEFW_DISABLE_FLOW_CONTROL;
820 	status = myri10ge_send_cmd(mgp, ctl, &cmd, 0);
821 
822 	if (status) {
823 		netdev_err(mgp->dev, "Failed to set flow control mode\n");
824 		return status;
825 	}
826 	mgp->pause = pause;
827 	return 0;
828 }
829 
830 static void
831 myri10ge_change_promisc(struct myri10ge_priv *mgp, int promisc, int atomic)
832 {
833 	struct myri10ge_cmd cmd;
834 	int status, ctl;
835 
836 	ctl = promisc ? MXGEFW_ENABLE_PROMISC : MXGEFW_DISABLE_PROMISC;
837 	status = myri10ge_send_cmd(mgp, ctl, &cmd, atomic);
838 	if (status)
839 		netdev_err(mgp->dev, "Failed to set promisc mode\n");
840 }
841 
842 static int myri10ge_dma_test(struct myri10ge_priv *mgp, int test_type)
843 {
844 	struct myri10ge_cmd cmd;
845 	int status;
846 	u32 len;
847 	struct page *dmatest_page;
848 	dma_addr_t dmatest_bus;
849 	char *test = " ";
850 
851 	dmatest_page = alloc_page(GFP_KERNEL);
852 	if (!dmatest_page)
853 		return -ENOMEM;
854 	dmatest_bus = dma_map_page(&mgp->pdev->dev, dmatest_page, 0,
855 				   PAGE_SIZE, DMA_BIDIRECTIONAL);
856 	if (unlikely(dma_mapping_error(&mgp->pdev->dev, dmatest_bus))) {
857 		__free_page(dmatest_page);
858 		return -ENOMEM;
859 	}
860 
861 	/* Run a small DMA test.
862 	 * The magic multipliers to the length tell the firmware
863 	 * to do DMA read, write, or read+write tests.  The
864 	 * results are returned in cmd.data0.  The upper 16
865 	 * bits or the return is the number of transfers completed.
866 	 * The lower 16 bits is the time in 0.5us ticks that the
867 	 * transfers took to complete.
868 	 */
869 
870 	len = mgp->tx_boundary;
871 
872 	cmd.data0 = MYRI10GE_LOWPART_TO_U32(dmatest_bus);
873 	cmd.data1 = MYRI10GE_HIGHPART_TO_U32(dmatest_bus);
874 	cmd.data2 = len * 0x10000;
875 	status = myri10ge_send_cmd(mgp, test_type, &cmd, 0);
876 	if (status != 0) {
877 		test = "read";
878 		goto abort;
879 	}
880 	mgp->read_dma = ((cmd.data0 >> 16) * len * 2) / (cmd.data0 & 0xffff);
881 	cmd.data0 = MYRI10GE_LOWPART_TO_U32(dmatest_bus);
882 	cmd.data1 = MYRI10GE_HIGHPART_TO_U32(dmatest_bus);
883 	cmd.data2 = len * 0x1;
884 	status = myri10ge_send_cmd(mgp, test_type, &cmd, 0);
885 	if (status != 0) {
886 		test = "write";
887 		goto abort;
888 	}
889 	mgp->write_dma = ((cmd.data0 >> 16) * len * 2) / (cmd.data0 & 0xffff);
890 
891 	cmd.data0 = MYRI10GE_LOWPART_TO_U32(dmatest_bus);
892 	cmd.data1 = MYRI10GE_HIGHPART_TO_U32(dmatest_bus);
893 	cmd.data2 = len * 0x10001;
894 	status = myri10ge_send_cmd(mgp, test_type, &cmd, 0);
895 	if (status != 0) {
896 		test = "read/write";
897 		goto abort;
898 	}
899 	mgp->read_write_dma = ((cmd.data0 >> 16) * len * 2 * 2) /
900 	    (cmd.data0 & 0xffff);
901 
902 abort:
903 	dma_unmap_page(&mgp->pdev->dev, dmatest_bus, PAGE_SIZE,
904 		       DMA_BIDIRECTIONAL);
905 	put_page(dmatest_page);
906 
907 	if (status != 0 && test_type != MXGEFW_CMD_UNALIGNED_TEST)
908 		dev_warn(&mgp->pdev->dev, "DMA %s benchmark failed: %d\n",
909 			 test, status);
910 
911 	return status;
912 }
913 
914 static int myri10ge_reset(struct myri10ge_priv *mgp)
915 {
916 	struct myri10ge_cmd cmd;
917 	struct myri10ge_slice_state *ss;
918 	int i, status;
919 	size_t bytes;
920 #ifdef CONFIG_MYRI10GE_DCA
921 	unsigned long dca_tag_off;
922 #endif
923 
924 	/* try to send a reset command to the card to see if it
925 	 * is alive */
926 	memset(&cmd, 0, sizeof(cmd));
927 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_RESET, &cmd, 0);
928 	if (status != 0) {
929 		dev_err(&mgp->pdev->dev, "failed reset\n");
930 		return -ENXIO;
931 	}
932 
933 	(void)myri10ge_dma_test(mgp, MXGEFW_DMA_TEST);
934 	/*
935 	 * Use non-ndis mcp_slot (eg, 4 bytes total,
936 	 * no toeplitz hash value returned.  Older firmware will
937 	 * not understand this command, but will use the correct
938 	 * sized mcp_slot, so we ignore error returns
939 	 */
940 	cmd.data0 = MXGEFW_RSS_MCP_SLOT_TYPE_MIN;
941 	(void)myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_RSS_MCP_SLOT_TYPE, &cmd, 0);
942 
943 	/* Now exchange information about interrupts  */
944 
945 	bytes = mgp->max_intr_slots * sizeof(*mgp->ss[0].rx_done.entry);
946 	cmd.data0 = (u32) bytes;
947 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_INTRQ_SIZE, &cmd, 0);
948 
949 	/*
950 	 * Even though we already know how many slices are supported
951 	 * via myri10ge_probe_slices() MXGEFW_CMD_GET_MAX_RSS_QUEUES
952 	 * has magic side effects, and must be called after a reset.
953 	 * It must be called prior to calling any RSS related cmds,
954 	 * including assigning an interrupt queue for anything but
955 	 * slice 0.  It must also be called *after*
956 	 * MXGEFW_CMD_SET_INTRQ_SIZE, since the intrq size is used by
957 	 * the firmware to compute offsets.
958 	 */
959 
960 	if (mgp->num_slices > 1) {
961 
962 		/* ask the maximum number of slices it supports */
963 		status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_MAX_RSS_QUEUES,
964 					   &cmd, 0);
965 		if (status != 0) {
966 			dev_err(&mgp->pdev->dev,
967 				"failed to get number of slices\n");
968 		}
969 
970 		/*
971 		 * MXGEFW_CMD_ENABLE_RSS_QUEUES must be called prior
972 		 * to setting up the interrupt queue DMA
973 		 */
974 
975 		cmd.data0 = mgp->num_slices;
976 		cmd.data1 = MXGEFW_SLICE_INTR_MODE_ONE_PER_SLICE;
977 		if (mgp->dev->real_num_tx_queues > 1)
978 			cmd.data1 |= MXGEFW_SLICE_ENABLE_MULTIPLE_TX_QUEUES;
979 		status = myri10ge_send_cmd(mgp, MXGEFW_CMD_ENABLE_RSS_QUEUES,
980 					   &cmd, 0);
981 
982 		/* Firmware older than 1.4.32 only supports multiple
983 		 * RX queues, so if we get an error, first retry using a
984 		 * single TX queue before giving up */
985 		if (status != 0 && mgp->dev->real_num_tx_queues > 1) {
986 			netif_set_real_num_tx_queues(mgp->dev, 1);
987 			cmd.data0 = mgp->num_slices;
988 			cmd.data1 = MXGEFW_SLICE_INTR_MODE_ONE_PER_SLICE;
989 			status = myri10ge_send_cmd(mgp,
990 						   MXGEFW_CMD_ENABLE_RSS_QUEUES,
991 						   &cmd, 0);
992 		}
993 
994 		if (status != 0) {
995 			dev_err(&mgp->pdev->dev,
996 				"failed to set number of slices\n");
997 
998 			return status;
999 		}
1000 	}
1001 	for (i = 0; i < mgp->num_slices; i++) {
1002 		ss = &mgp->ss[i];
1003 		cmd.data0 = MYRI10GE_LOWPART_TO_U32(ss->rx_done.bus);
1004 		cmd.data1 = MYRI10GE_HIGHPART_TO_U32(ss->rx_done.bus);
1005 		cmd.data2 = i;
1006 		status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_INTRQ_DMA,
1007 					    &cmd, 0);
1008 	}
1009 
1010 	status |=
1011 	    myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_IRQ_ACK_OFFSET, &cmd, 0);
1012 	for (i = 0; i < mgp->num_slices; i++) {
1013 		ss = &mgp->ss[i];
1014 		ss->irq_claim =
1015 		    (__iomem __be32 *) (mgp->sram + cmd.data0 + 8 * i);
1016 	}
1017 	status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_IRQ_DEASSERT_OFFSET,
1018 				    &cmd, 0);
1019 	mgp->irq_deassert = (__iomem __be32 *) (mgp->sram + cmd.data0);
1020 
1021 	status |= myri10ge_send_cmd
1022 	    (mgp, MXGEFW_CMD_GET_INTR_COAL_DELAY_OFFSET, &cmd, 0);
1023 	mgp->intr_coal_delay_ptr = (__iomem __be32 *) (mgp->sram + cmd.data0);
1024 	if (status != 0) {
1025 		dev_err(&mgp->pdev->dev, "failed set interrupt parameters\n");
1026 		return status;
1027 	}
1028 	put_be32(htonl(mgp->intr_coal_delay), mgp->intr_coal_delay_ptr);
1029 
1030 #ifdef CONFIG_MYRI10GE_DCA
1031 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_DCA_OFFSET, &cmd, 0);
1032 	dca_tag_off = cmd.data0;
1033 	for (i = 0; i < mgp->num_slices; i++) {
1034 		ss = &mgp->ss[i];
1035 		if (status == 0) {
1036 			ss->dca_tag = (__iomem __be32 *)
1037 			    (mgp->sram + dca_tag_off + 4 * i);
1038 		} else {
1039 			ss->dca_tag = NULL;
1040 		}
1041 	}
1042 #endif				/* CONFIG_MYRI10GE_DCA */
1043 
1044 	/* reset mcp/driver shared state back to 0 */
1045 
1046 	mgp->link_changes = 0;
1047 	for (i = 0; i < mgp->num_slices; i++) {
1048 		ss = &mgp->ss[i];
1049 
1050 		memset(ss->rx_done.entry, 0, bytes);
1051 		ss->tx.req = 0;
1052 		ss->tx.done = 0;
1053 		ss->tx.pkt_start = 0;
1054 		ss->tx.pkt_done = 0;
1055 		ss->rx_big.cnt = 0;
1056 		ss->rx_small.cnt = 0;
1057 		ss->rx_done.idx = 0;
1058 		ss->rx_done.cnt = 0;
1059 		ss->tx.wake_queue = 0;
1060 		ss->tx.stop_queue = 0;
1061 	}
1062 
1063 	status = myri10ge_update_mac_address(mgp, mgp->dev->dev_addr);
1064 	myri10ge_change_pause(mgp, mgp->pause);
1065 	myri10ge_set_multicast_list(mgp->dev);
1066 	return status;
1067 }
1068 
1069 #ifdef CONFIG_MYRI10GE_DCA
1070 static int myri10ge_toggle_relaxed(struct pci_dev *pdev, int on)
1071 {
1072 	int ret;
1073 	u16 ctl;
1074 
1075 	pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &ctl);
1076 
1077 	ret = (ctl & PCI_EXP_DEVCTL_RELAX_EN) >> 4;
1078 	if (ret != on) {
1079 		ctl &= ~PCI_EXP_DEVCTL_RELAX_EN;
1080 		ctl |= (on << 4);
1081 		pcie_capability_write_word(pdev, PCI_EXP_DEVCTL, ctl);
1082 	}
1083 	return ret;
1084 }
1085 
1086 static void
1087 myri10ge_write_dca(struct myri10ge_slice_state *ss, int cpu, int tag)
1088 {
1089 	ss->cached_dca_tag = tag;
1090 	put_be32(htonl(tag), ss->dca_tag);
1091 }
1092 
1093 static inline void myri10ge_update_dca(struct myri10ge_slice_state *ss)
1094 {
1095 	int cpu = get_cpu();
1096 	int tag;
1097 
1098 	if (cpu != ss->cpu) {
1099 		tag = dca3_get_tag(&ss->mgp->pdev->dev, cpu);
1100 		if (ss->cached_dca_tag != tag)
1101 			myri10ge_write_dca(ss, cpu, tag);
1102 		ss->cpu = cpu;
1103 	}
1104 	put_cpu();
1105 }
1106 
1107 static void myri10ge_setup_dca(struct myri10ge_priv *mgp)
1108 {
1109 	int err, i;
1110 	struct pci_dev *pdev = mgp->pdev;
1111 
1112 	if (mgp->ss[0].dca_tag == NULL || mgp->dca_enabled)
1113 		return;
1114 	if (!myri10ge_dca) {
1115 		dev_err(&pdev->dev, "dca disabled by administrator\n");
1116 		return;
1117 	}
1118 	err = dca_add_requester(&pdev->dev);
1119 	if (err) {
1120 		if (err != -ENODEV)
1121 			dev_err(&pdev->dev,
1122 				"dca_add_requester() failed, err=%d\n", err);
1123 		return;
1124 	}
1125 	mgp->relaxed_order = myri10ge_toggle_relaxed(pdev, 0);
1126 	mgp->dca_enabled = 1;
1127 	for (i = 0; i < mgp->num_slices; i++) {
1128 		mgp->ss[i].cpu = -1;
1129 		mgp->ss[i].cached_dca_tag = -1;
1130 		myri10ge_update_dca(&mgp->ss[i]);
1131 	}
1132 }
1133 
1134 static void myri10ge_teardown_dca(struct myri10ge_priv *mgp)
1135 {
1136 	struct pci_dev *pdev = mgp->pdev;
1137 
1138 	if (!mgp->dca_enabled)
1139 		return;
1140 	mgp->dca_enabled = 0;
1141 	if (mgp->relaxed_order)
1142 		myri10ge_toggle_relaxed(pdev, 1);
1143 	dca_remove_requester(&pdev->dev);
1144 }
1145 
1146 static int myri10ge_notify_dca_device(struct device *dev, void *data)
1147 {
1148 	struct myri10ge_priv *mgp;
1149 	unsigned long event;
1150 
1151 	mgp = dev_get_drvdata(dev);
1152 	event = *(unsigned long *)data;
1153 
1154 	if (event == DCA_PROVIDER_ADD)
1155 		myri10ge_setup_dca(mgp);
1156 	else if (event == DCA_PROVIDER_REMOVE)
1157 		myri10ge_teardown_dca(mgp);
1158 	return 0;
1159 }
1160 #endif				/* CONFIG_MYRI10GE_DCA */
1161 
1162 static inline void
1163 myri10ge_submit_8rx(struct mcp_kreq_ether_recv __iomem * dst,
1164 		    struct mcp_kreq_ether_recv *src)
1165 {
1166 	__be32 low;
1167 
1168 	low = src->addr_low;
1169 	src->addr_low = htonl(DMA_BIT_MASK(32));
1170 	myri10ge_pio_copy(dst, src, 4 * sizeof(*src));
1171 	mb();
1172 	myri10ge_pio_copy(dst + 4, src + 4, 4 * sizeof(*src));
1173 	mb();
1174 	src->addr_low = low;
1175 	put_be32(low, &dst->addr_low);
1176 	mb();
1177 }
1178 
1179 static void
1180 myri10ge_alloc_rx_pages(struct myri10ge_priv *mgp, struct myri10ge_rx_buf *rx,
1181 			int bytes, int watchdog)
1182 {
1183 	struct page *page;
1184 	dma_addr_t bus;
1185 	int idx;
1186 #if MYRI10GE_ALLOC_SIZE > 4096
1187 	int end_offset;
1188 #endif
1189 
1190 	if (unlikely(rx->watchdog_needed && !watchdog))
1191 		return;
1192 
1193 	/* try to refill entire ring */
1194 	while (rx->fill_cnt != (rx->cnt + rx->mask + 1)) {
1195 		idx = rx->fill_cnt & rx->mask;
1196 		if (rx->page_offset + bytes <= MYRI10GE_ALLOC_SIZE) {
1197 			/* we can use part of previous page */
1198 			get_page(rx->page);
1199 		} else {
1200 			/* we need a new page */
1201 			page =
1202 			    alloc_pages(GFP_ATOMIC | __GFP_COMP,
1203 					MYRI10GE_ALLOC_ORDER);
1204 			if (unlikely(page == NULL)) {
1205 				if (rx->fill_cnt - rx->cnt < 16)
1206 					rx->watchdog_needed = 1;
1207 				return;
1208 			}
1209 
1210 			bus = dma_map_page(&mgp->pdev->dev, page, 0,
1211 					   MYRI10GE_ALLOC_SIZE,
1212 					   DMA_FROM_DEVICE);
1213 			if (unlikely(dma_mapping_error(&mgp->pdev->dev, bus))) {
1214 				__free_pages(page, MYRI10GE_ALLOC_ORDER);
1215 				if (rx->fill_cnt - rx->cnt < 16)
1216 					rx->watchdog_needed = 1;
1217 				return;
1218 			}
1219 
1220 			rx->page = page;
1221 			rx->page_offset = 0;
1222 			rx->bus = bus;
1223 
1224 		}
1225 		rx->info[idx].page = rx->page;
1226 		rx->info[idx].page_offset = rx->page_offset;
1227 		/* note that this is the address of the start of the
1228 		 * page */
1229 		dma_unmap_addr_set(&rx->info[idx], bus, rx->bus);
1230 		rx->shadow[idx].addr_low =
1231 		    htonl(MYRI10GE_LOWPART_TO_U32(rx->bus) + rx->page_offset);
1232 		rx->shadow[idx].addr_high =
1233 		    htonl(MYRI10GE_HIGHPART_TO_U32(rx->bus));
1234 
1235 		/* start next packet on a cacheline boundary */
1236 		rx->page_offset += SKB_DATA_ALIGN(bytes);
1237 
1238 #if MYRI10GE_ALLOC_SIZE > 4096
1239 		/* don't cross a 4KB boundary */
1240 		end_offset = rx->page_offset + bytes - 1;
1241 		if ((unsigned)(rx->page_offset ^ end_offset) > 4095)
1242 			rx->page_offset = end_offset & ~4095;
1243 #endif
1244 		rx->fill_cnt++;
1245 
1246 		/* copy 8 descriptors to the firmware at a time */
1247 		if ((idx & 7) == 7) {
1248 			myri10ge_submit_8rx(&rx->lanai[idx - 7],
1249 					    &rx->shadow[idx - 7]);
1250 		}
1251 	}
1252 }
1253 
1254 static inline void
1255 myri10ge_unmap_rx_page(struct pci_dev *pdev,
1256 		       struct myri10ge_rx_buffer_state *info, int bytes)
1257 {
1258 	/* unmap the recvd page if we're the only or last user of it */
1259 	if (bytes >= MYRI10GE_ALLOC_SIZE / 2 ||
1260 	    (info->page_offset + 2 * bytes) > MYRI10GE_ALLOC_SIZE) {
1261 		dma_unmap_page(&pdev->dev, (dma_unmap_addr(info, bus)
1262 					    & ~(MYRI10GE_ALLOC_SIZE - 1)),
1263 			       MYRI10GE_ALLOC_SIZE, DMA_FROM_DEVICE);
1264 	}
1265 }
1266 
1267 /*
1268  * GRO does not support acceleration of tagged vlan frames, and
1269  * this NIC does not support vlan tag offload, so we must pop
1270  * the tag ourselves to be able to achieve GRO performance that
1271  * is comparable to LRO.
1272  */
1273 
1274 static inline void
1275 myri10ge_vlan_rx(struct net_device *dev, void *addr, struct sk_buff *skb)
1276 {
1277 	u8 *va;
1278 	struct vlan_ethhdr *veh;
1279 	skb_frag_t *frag;
1280 	__wsum vsum;
1281 
1282 	va = addr;
1283 	va += MXGEFW_PAD;
1284 	veh = (struct vlan_ethhdr *)va;
1285 	if ((dev->features & NETIF_F_HW_VLAN_CTAG_RX) ==
1286 	    NETIF_F_HW_VLAN_CTAG_RX &&
1287 	    veh->h_vlan_proto == htons(ETH_P_8021Q)) {
1288 		/* fixup csum if needed */
1289 		if (skb->ip_summed == CHECKSUM_COMPLETE) {
1290 			vsum = csum_partial(va + ETH_HLEN, VLAN_HLEN, 0);
1291 			skb->csum = csum_sub(skb->csum, vsum);
1292 		}
1293 		/* pop tag */
1294 		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(veh->h_vlan_TCI));
1295 		memmove(va + VLAN_HLEN, va, 2 * ETH_ALEN);
1296 		skb->len -= VLAN_HLEN;
1297 		skb->data_len -= VLAN_HLEN;
1298 		frag = skb_shinfo(skb)->frags;
1299 		skb_frag_off_add(frag, VLAN_HLEN);
1300 		skb_frag_size_sub(frag, VLAN_HLEN);
1301 	}
1302 }
1303 
1304 #define MYRI10GE_HLEN 64 /* Bytes to copy from page to skb linear memory */
1305 
1306 static inline int
1307 myri10ge_rx_done(struct myri10ge_slice_state *ss, int len, __wsum csum)
1308 {
1309 	struct myri10ge_priv *mgp = ss->mgp;
1310 	struct sk_buff *skb;
1311 	skb_frag_t *rx_frags;
1312 	struct myri10ge_rx_buf *rx;
1313 	int i, idx, remainder, bytes;
1314 	struct pci_dev *pdev = mgp->pdev;
1315 	struct net_device *dev = mgp->dev;
1316 	u8 *va;
1317 
1318 	if (len <= mgp->small_bytes) {
1319 		rx = &ss->rx_small;
1320 		bytes = mgp->small_bytes;
1321 	} else {
1322 		rx = &ss->rx_big;
1323 		bytes = mgp->big_bytes;
1324 	}
1325 
1326 	len += MXGEFW_PAD;
1327 	idx = rx->cnt & rx->mask;
1328 	va = page_address(rx->info[idx].page) + rx->info[idx].page_offset;
1329 	prefetch(va);
1330 
1331 	skb = napi_get_frags(&ss->napi);
1332 	if (unlikely(skb == NULL)) {
1333 		ss->stats.rx_dropped++;
1334 		for (i = 0, remainder = len; remainder > 0; i++) {
1335 			myri10ge_unmap_rx_page(pdev, &rx->info[idx], bytes);
1336 			put_page(rx->info[idx].page);
1337 			rx->cnt++;
1338 			idx = rx->cnt & rx->mask;
1339 			remainder -= MYRI10GE_ALLOC_SIZE;
1340 		}
1341 		return 0;
1342 	}
1343 	rx_frags = skb_shinfo(skb)->frags;
1344 	/* Fill skb_frag_t(s) with data from our receive */
1345 	for (i = 0, remainder = len; remainder > 0; i++) {
1346 		myri10ge_unmap_rx_page(pdev, &rx->info[idx], bytes);
1347 		skb_fill_page_desc(skb, i, rx->info[idx].page,
1348 				   rx->info[idx].page_offset,
1349 				   remainder < MYRI10GE_ALLOC_SIZE ?
1350 				   remainder : MYRI10GE_ALLOC_SIZE);
1351 		rx->cnt++;
1352 		idx = rx->cnt & rx->mask;
1353 		remainder -= MYRI10GE_ALLOC_SIZE;
1354 	}
1355 
1356 	/* remove padding */
1357 	skb_frag_off_add(&rx_frags[0], MXGEFW_PAD);
1358 	skb_frag_size_sub(&rx_frags[0], MXGEFW_PAD);
1359 	len -= MXGEFW_PAD;
1360 
1361 	skb->len = len;
1362 	skb->data_len = len;
1363 	skb->truesize += len;
1364 	if (dev->features & NETIF_F_RXCSUM) {
1365 		skb->ip_summed = CHECKSUM_COMPLETE;
1366 		skb->csum = csum;
1367 	}
1368 	myri10ge_vlan_rx(mgp->dev, va, skb);
1369 	skb_record_rx_queue(skb, ss - &mgp->ss[0]);
1370 
1371 	napi_gro_frags(&ss->napi);
1372 
1373 	return 1;
1374 }
1375 
1376 static inline void
1377 myri10ge_tx_done(struct myri10ge_slice_state *ss, int mcp_index)
1378 {
1379 	struct pci_dev *pdev = ss->mgp->pdev;
1380 	struct myri10ge_tx_buf *tx = &ss->tx;
1381 	struct netdev_queue *dev_queue;
1382 	struct sk_buff *skb;
1383 	int idx, len;
1384 
1385 	while (tx->pkt_done != mcp_index) {
1386 		idx = tx->done & tx->mask;
1387 		skb = tx->info[idx].skb;
1388 
1389 		/* Mark as free */
1390 		tx->info[idx].skb = NULL;
1391 		if (tx->info[idx].last) {
1392 			tx->pkt_done++;
1393 			tx->info[idx].last = 0;
1394 		}
1395 		tx->done++;
1396 		len = dma_unmap_len(&tx->info[idx], len);
1397 		dma_unmap_len_set(&tx->info[idx], len, 0);
1398 		if (skb) {
1399 			ss->stats.tx_bytes += skb->len;
1400 			ss->stats.tx_packets++;
1401 			dev_consume_skb_irq(skb);
1402 			if (len)
1403 				dma_unmap_single(&pdev->dev,
1404 						 dma_unmap_addr(&tx->info[idx],
1405 								bus), len,
1406 						 DMA_TO_DEVICE);
1407 		} else {
1408 			if (len)
1409 				dma_unmap_page(&pdev->dev,
1410 					       dma_unmap_addr(&tx->info[idx],
1411 							      bus), len,
1412 					       DMA_TO_DEVICE);
1413 		}
1414 	}
1415 
1416 	dev_queue = netdev_get_tx_queue(ss->dev, ss - ss->mgp->ss);
1417 	/*
1418 	 * Make a minimal effort to prevent the NIC from polling an
1419 	 * idle tx queue.  If we can't get the lock we leave the queue
1420 	 * active. In this case, either a thread was about to start
1421 	 * using the queue anyway, or we lost a race and the NIC will
1422 	 * waste some of its resources polling an inactive queue for a
1423 	 * while.
1424 	 */
1425 
1426 	if ((ss->mgp->dev->real_num_tx_queues > 1) &&
1427 	    __netif_tx_trylock(dev_queue)) {
1428 		if (tx->req == tx->done) {
1429 			tx->queue_active = 0;
1430 			put_be32(htonl(1), tx->send_stop);
1431 			mb();
1432 		}
1433 		__netif_tx_unlock(dev_queue);
1434 	}
1435 
1436 	/* start the queue if we've stopped it */
1437 	if (netif_tx_queue_stopped(dev_queue) &&
1438 	    tx->req - tx->done < (tx->mask >> 1) &&
1439 	    ss->mgp->running == MYRI10GE_ETH_RUNNING) {
1440 		tx->wake_queue++;
1441 		netif_tx_wake_queue(dev_queue);
1442 	}
1443 }
1444 
1445 static inline int
1446 myri10ge_clean_rx_done(struct myri10ge_slice_state *ss, int budget)
1447 {
1448 	struct myri10ge_rx_done *rx_done = &ss->rx_done;
1449 	struct myri10ge_priv *mgp = ss->mgp;
1450 	unsigned long rx_bytes = 0;
1451 	unsigned long rx_packets = 0;
1452 	unsigned long rx_ok;
1453 	int idx = rx_done->idx;
1454 	int cnt = rx_done->cnt;
1455 	int work_done = 0;
1456 	u16 length;
1457 	__wsum checksum;
1458 
1459 	while (rx_done->entry[idx].length != 0 && work_done < budget) {
1460 		length = ntohs(rx_done->entry[idx].length);
1461 		rx_done->entry[idx].length = 0;
1462 		checksum = csum_unfold(rx_done->entry[idx].checksum);
1463 		rx_ok = myri10ge_rx_done(ss, length, checksum);
1464 		rx_packets += rx_ok;
1465 		rx_bytes += rx_ok * (unsigned long)length;
1466 		cnt++;
1467 		idx = cnt & (mgp->max_intr_slots - 1);
1468 		work_done++;
1469 	}
1470 	rx_done->idx = idx;
1471 	rx_done->cnt = cnt;
1472 	ss->stats.rx_packets += rx_packets;
1473 	ss->stats.rx_bytes += rx_bytes;
1474 
1475 	/* restock receive rings if needed */
1476 	if (ss->rx_small.fill_cnt - ss->rx_small.cnt < myri10ge_fill_thresh)
1477 		myri10ge_alloc_rx_pages(mgp, &ss->rx_small,
1478 					mgp->small_bytes + MXGEFW_PAD, 0);
1479 	if (ss->rx_big.fill_cnt - ss->rx_big.cnt < myri10ge_fill_thresh)
1480 		myri10ge_alloc_rx_pages(mgp, &ss->rx_big, mgp->big_bytes, 0);
1481 
1482 	return work_done;
1483 }
1484 
1485 static inline void myri10ge_check_statblock(struct myri10ge_priv *mgp)
1486 {
1487 	struct mcp_irq_data *stats = mgp->ss[0].fw_stats;
1488 
1489 	if (unlikely(stats->stats_updated)) {
1490 		unsigned link_up = ntohl(stats->link_up);
1491 		if (mgp->link_state != link_up) {
1492 			mgp->link_state = link_up;
1493 
1494 			if (mgp->link_state == MXGEFW_LINK_UP) {
1495 				netif_info(mgp, link, mgp->dev, "link up\n");
1496 				netif_carrier_on(mgp->dev);
1497 				mgp->link_changes++;
1498 			} else {
1499 				netif_info(mgp, link, mgp->dev, "link %s\n",
1500 					   (link_up == MXGEFW_LINK_MYRINET ?
1501 					    "mismatch (Myrinet detected)" :
1502 					    "down"));
1503 				netif_carrier_off(mgp->dev);
1504 				mgp->link_changes++;
1505 			}
1506 		}
1507 		if (mgp->rdma_tags_available !=
1508 		    ntohl(stats->rdma_tags_available)) {
1509 			mgp->rdma_tags_available =
1510 			    ntohl(stats->rdma_tags_available);
1511 			netdev_warn(mgp->dev, "RDMA timed out! %d tags left\n",
1512 				    mgp->rdma_tags_available);
1513 		}
1514 		mgp->down_cnt += stats->link_down;
1515 		if (stats->link_down)
1516 			wake_up(&mgp->down_wq);
1517 	}
1518 }
1519 
1520 static int myri10ge_poll(struct napi_struct *napi, int budget)
1521 {
1522 	struct myri10ge_slice_state *ss =
1523 	    container_of(napi, struct myri10ge_slice_state, napi);
1524 	int work_done;
1525 
1526 #ifdef CONFIG_MYRI10GE_DCA
1527 	if (ss->mgp->dca_enabled)
1528 		myri10ge_update_dca(ss);
1529 #endif
1530 	/* process as many rx events as NAPI will allow */
1531 	work_done = myri10ge_clean_rx_done(ss, budget);
1532 
1533 	if (work_done < budget) {
1534 		napi_complete_done(napi, work_done);
1535 		put_be32(htonl(3), ss->irq_claim);
1536 	}
1537 	return work_done;
1538 }
1539 
1540 static irqreturn_t myri10ge_intr(int irq, void *arg)
1541 {
1542 	struct myri10ge_slice_state *ss = arg;
1543 	struct myri10ge_priv *mgp = ss->mgp;
1544 	struct mcp_irq_data *stats = ss->fw_stats;
1545 	struct myri10ge_tx_buf *tx = &ss->tx;
1546 	u32 send_done_count;
1547 	int i;
1548 
1549 	/* an interrupt on a non-zero receive-only slice is implicitly
1550 	 * valid  since MSI-X irqs are not shared */
1551 	if ((mgp->dev->real_num_tx_queues == 1) && (ss != mgp->ss)) {
1552 		napi_schedule(&ss->napi);
1553 		return IRQ_HANDLED;
1554 	}
1555 
1556 	/* make sure it is our IRQ, and that the DMA has finished */
1557 	if (unlikely(!stats->valid))
1558 		return IRQ_NONE;
1559 
1560 	/* low bit indicates receives are present, so schedule
1561 	 * napi poll handler */
1562 	if (stats->valid & 1)
1563 		napi_schedule(&ss->napi);
1564 
1565 	if (!mgp->msi_enabled && !mgp->msix_enabled) {
1566 		put_be32(0, mgp->irq_deassert);
1567 		if (!myri10ge_deassert_wait)
1568 			stats->valid = 0;
1569 		mb();
1570 	} else
1571 		stats->valid = 0;
1572 
1573 	/* Wait for IRQ line to go low, if using INTx */
1574 	i = 0;
1575 	while (1) {
1576 		i++;
1577 		/* check for transmit completes and receives */
1578 		send_done_count = ntohl(stats->send_done_count);
1579 		if (send_done_count != tx->pkt_done)
1580 			myri10ge_tx_done(ss, (int)send_done_count);
1581 		if (unlikely(i > myri10ge_max_irq_loops)) {
1582 			netdev_warn(mgp->dev, "irq stuck?\n");
1583 			stats->valid = 0;
1584 			schedule_work(&mgp->watchdog_work);
1585 		}
1586 		if (likely(stats->valid == 0))
1587 			break;
1588 		cpu_relax();
1589 		barrier();
1590 	}
1591 
1592 	/* Only slice 0 updates stats */
1593 	if (ss == mgp->ss)
1594 		myri10ge_check_statblock(mgp);
1595 
1596 	put_be32(htonl(3), ss->irq_claim + 1);
1597 	return IRQ_HANDLED;
1598 }
1599 
1600 static int
1601 myri10ge_get_link_ksettings(struct net_device *netdev,
1602 			    struct ethtool_link_ksettings *cmd)
1603 {
1604 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1605 	char *ptr;
1606 	int i;
1607 
1608 	cmd->base.autoneg = AUTONEG_DISABLE;
1609 	cmd->base.speed = SPEED_10000;
1610 	cmd->base.duplex = DUPLEX_FULL;
1611 
1612 	/*
1613 	 * parse the product code to deterimine the interface type
1614 	 * (CX4, XFP, Quad Ribbon Fiber) by looking at the character
1615 	 * after the 3rd dash in the driver's cached copy of the
1616 	 * EEPROM's product code string.
1617 	 */
1618 	ptr = mgp->product_code_string;
1619 	if (ptr == NULL) {
1620 		netdev_err(netdev, "Missing product code\n");
1621 		return 0;
1622 	}
1623 	for (i = 0; i < 3; i++, ptr++) {
1624 		ptr = strchr(ptr, '-');
1625 		if (ptr == NULL) {
1626 			netdev_err(netdev, "Invalid product code %s\n",
1627 				   mgp->product_code_string);
1628 			return 0;
1629 		}
1630 	}
1631 	if (*ptr == '2')
1632 		ptr++;
1633 	if (*ptr == 'R' || *ptr == 'Q' || *ptr == 'S') {
1634 		/* We've found either an XFP, quad ribbon fiber, or SFP+ */
1635 		cmd->base.port = PORT_FIBRE;
1636 		ethtool_link_ksettings_add_link_mode(cmd, supported, FIBRE);
1637 		ethtool_link_ksettings_add_link_mode(cmd, advertising, FIBRE);
1638 	} else {
1639 		cmd->base.port = PORT_OTHER;
1640 	}
1641 
1642 	return 0;
1643 }
1644 
1645 static void
1646 myri10ge_get_drvinfo(struct net_device *netdev, struct ethtool_drvinfo *info)
1647 {
1648 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1649 
1650 	strlcpy(info->driver, "myri10ge", sizeof(info->driver));
1651 	strlcpy(info->version, MYRI10GE_VERSION_STR, sizeof(info->version));
1652 	strlcpy(info->fw_version, mgp->fw_version, sizeof(info->fw_version));
1653 	strlcpy(info->bus_info, pci_name(mgp->pdev), sizeof(info->bus_info));
1654 }
1655 
1656 static int myri10ge_get_coalesce(struct net_device *netdev,
1657 				 struct ethtool_coalesce *coal,
1658 				 struct kernel_ethtool_coalesce *kernel_coal,
1659 				 struct netlink_ext_ack *extack)
1660 {
1661 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1662 
1663 	coal->rx_coalesce_usecs = mgp->intr_coal_delay;
1664 	return 0;
1665 }
1666 
1667 static int myri10ge_set_coalesce(struct net_device *netdev,
1668 				 struct ethtool_coalesce *coal,
1669 				 struct kernel_ethtool_coalesce *kernel_coal,
1670 				 struct netlink_ext_ack *extack)
1671 {
1672 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1673 
1674 	mgp->intr_coal_delay = coal->rx_coalesce_usecs;
1675 	put_be32(htonl(mgp->intr_coal_delay), mgp->intr_coal_delay_ptr);
1676 	return 0;
1677 }
1678 
1679 static void
1680 myri10ge_get_pauseparam(struct net_device *netdev,
1681 			struct ethtool_pauseparam *pause)
1682 {
1683 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1684 
1685 	pause->autoneg = 0;
1686 	pause->rx_pause = mgp->pause;
1687 	pause->tx_pause = mgp->pause;
1688 }
1689 
1690 static int
1691 myri10ge_set_pauseparam(struct net_device *netdev,
1692 			struct ethtool_pauseparam *pause)
1693 {
1694 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1695 
1696 	if (pause->tx_pause != mgp->pause)
1697 		return myri10ge_change_pause(mgp, pause->tx_pause);
1698 	if (pause->rx_pause != mgp->pause)
1699 		return myri10ge_change_pause(mgp, pause->rx_pause);
1700 	if (pause->autoneg != 0)
1701 		return -EINVAL;
1702 	return 0;
1703 }
1704 
1705 static void
1706 myri10ge_get_ringparam(struct net_device *netdev,
1707 		       struct ethtool_ringparam *ring,
1708 		       struct kernel_ethtool_ringparam *kernel_ring,
1709 		       struct netlink_ext_ack *extack)
1710 {
1711 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1712 
1713 	ring->rx_mini_max_pending = mgp->ss[0].rx_small.mask + 1;
1714 	ring->rx_max_pending = mgp->ss[0].rx_big.mask + 1;
1715 	ring->rx_jumbo_max_pending = 0;
1716 	ring->tx_max_pending = mgp->ss[0].tx.mask + 1;
1717 	ring->rx_mini_pending = ring->rx_mini_max_pending;
1718 	ring->rx_pending = ring->rx_max_pending;
1719 	ring->rx_jumbo_pending = ring->rx_jumbo_max_pending;
1720 	ring->tx_pending = ring->tx_max_pending;
1721 }
1722 
1723 static const char myri10ge_gstrings_main_stats[][ETH_GSTRING_LEN] = {
1724 	"rx_packets", "tx_packets", "rx_bytes", "tx_bytes", "rx_errors",
1725 	"tx_errors", "rx_dropped", "tx_dropped", "multicast", "collisions",
1726 	"rx_length_errors", "rx_over_errors", "rx_crc_errors",
1727 	"rx_frame_errors", "rx_fifo_errors", "rx_missed_errors",
1728 	"tx_aborted_errors", "tx_carrier_errors", "tx_fifo_errors",
1729 	"tx_heartbeat_errors", "tx_window_errors",
1730 	/* device-specific stats */
1731 	"tx_boundary", "irq", "MSI", "MSIX",
1732 	"read_dma_bw_MBs", "write_dma_bw_MBs", "read_write_dma_bw_MBs",
1733 	"serial_number", "watchdog_resets",
1734 #ifdef CONFIG_MYRI10GE_DCA
1735 	"dca_capable_firmware", "dca_device_present",
1736 #endif
1737 	"link_changes", "link_up", "dropped_link_overflow",
1738 	"dropped_link_error_or_filtered",
1739 	"dropped_pause", "dropped_bad_phy", "dropped_bad_crc32",
1740 	"dropped_unicast_filtered", "dropped_multicast_filtered",
1741 	"dropped_runt", "dropped_overrun", "dropped_no_small_buffer",
1742 	"dropped_no_big_buffer"
1743 };
1744 
1745 static const char myri10ge_gstrings_slice_stats[][ETH_GSTRING_LEN] = {
1746 	"----------- slice ---------",
1747 	"tx_pkt_start", "tx_pkt_done", "tx_req", "tx_done",
1748 	"rx_small_cnt", "rx_big_cnt",
1749 	"wake_queue", "stop_queue", "tx_linearized",
1750 };
1751 
1752 #define MYRI10GE_NET_STATS_LEN      21
1753 #define MYRI10GE_MAIN_STATS_LEN  ARRAY_SIZE(myri10ge_gstrings_main_stats)
1754 #define MYRI10GE_SLICE_STATS_LEN  ARRAY_SIZE(myri10ge_gstrings_slice_stats)
1755 
1756 static void
1757 myri10ge_get_strings(struct net_device *netdev, u32 stringset, u8 * data)
1758 {
1759 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1760 	int i;
1761 
1762 	switch (stringset) {
1763 	case ETH_SS_STATS:
1764 		memcpy(data, *myri10ge_gstrings_main_stats,
1765 		       sizeof(myri10ge_gstrings_main_stats));
1766 		data += sizeof(myri10ge_gstrings_main_stats);
1767 		for (i = 0; i < mgp->num_slices; i++) {
1768 			memcpy(data, *myri10ge_gstrings_slice_stats,
1769 			       sizeof(myri10ge_gstrings_slice_stats));
1770 			data += sizeof(myri10ge_gstrings_slice_stats);
1771 		}
1772 		break;
1773 	}
1774 }
1775 
1776 static int myri10ge_get_sset_count(struct net_device *netdev, int sset)
1777 {
1778 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1779 
1780 	switch (sset) {
1781 	case ETH_SS_STATS:
1782 		return MYRI10GE_MAIN_STATS_LEN +
1783 		    mgp->num_slices * MYRI10GE_SLICE_STATS_LEN;
1784 	default:
1785 		return -EOPNOTSUPP;
1786 	}
1787 }
1788 
1789 static void
1790 myri10ge_get_ethtool_stats(struct net_device *netdev,
1791 			   struct ethtool_stats *stats, u64 * data)
1792 {
1793 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1794 	struct myri10ge_slice_state *ss;
1795 	struct rtnl_link_stats64 link_stats;
1796 	int slice;
1797 	int i;
1798 
1799 	/* force stats update */
1800 	memset(&link_stats, 0, sizeof(link_stats));
1801 	(void)myri10ge_get_stats(netdev, &link_stats);
1802 	for (i = 0; i < MYRI10GE_NET_STATS_LEN; i++)
1803 		data[i] = ((u64 *)&link_stats)[i];
1804 
1805 	data[i++] = (unsigned int)mgp->tx_boundary;
1806 	data[i++] = (unsigned int)mgp->pdev->irq;
1807 	data[i++] = (unsigned int)mgp->msi_enabled;
1808 	data[i++] = (unsigned int)mgp->msix_enabled;
1809 	data[i++] = (unsigned int)mgp->read_dma;
1810 	data[i++] = (unsigned int)mgp->write_dma;
1811 	data[i++] = (unsigned int)mgp->read_write_dma;
1812 	data[i++] = (unsigned int)mgp->serial_number;
1813 	data[i++] = (unsigned int)mgp->watchdog_resets;
1814 #ifdef CONFIG_MYRI10GE_DCA
1815 	data[i++] = (unsigned int)(mgp->ss[0].dca_tag != NULL);
1816 	data[i++] = (unsigned int)(mgp->dca_enabled);
1817 #endif
1818 	data[i++] = (unsigned int)mgp->link_changes;
1819 
1820 	/* firmware stats are useful only in the first slice */
1821 	ss = &mgp->ss[0];
1822 	data[i++] = (unsigned int)ntohl(ss->fw_stats->link_up);
1823 	data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_link_overflow);
1824 	data[i++] =
1825 	    (unsigned int)ntohl(ss->fw_stats->dropped_link_error_or_filtered);
1826 	data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_pause);
1827 	data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_bad_phy);
1828 	data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_bad_crc32);
1829 	data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_unicast_filtered);
1830 	data[i++] =
1831 	    (unsigned int)ntohl(ss->fw_stats->dropped_multicast_filtered);
1832 	data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_runt);
1833 	data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_overrun);
1834 	data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_no_small_buffer);
1835 	data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_no_big_buffer);
1836 
1837 	for (slice = 0; slice < mgp->num_slices; slice++) {
1838 		ss = &mgp->ss[slice];
1839 		data[i++] = slice;
1840 		data[i++] = (unsigned int)ss->tx.pkt_start;
1841 		data[i++] = (unsigned int)ss->tx.pkt_done;
1842 		data[i++] = (unsigned int)ss->tx.req;
1843 		data[i++] = (unsigned int)ss->tx.done;
1844 		data[i++] = (unsigned int)ss->rx_small.cnt;
1845 		data[i++] = (unsigned int)ss->rx_big.cnt;
1846 		data[i++] = (unsigned int)ss->tx.wake_queue;
1847 		data[i++] = (unsigned int)ss->tx.stop_queue;
1848 		data[i++] = (unsigned int)ss->tx.linearized;
1849 	}
1850 }
1851 
1852 static void myri10ge_set_msglevel(struct net_device *netdev, u32 value)
1853 {
1854 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1855 	mgp->msg_enable = value;
1856 }
1857 
1858 static u32 myri10ge_get_msglevel(struct net_device *netdev)
1859 {
1860 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1861 	return mgp->msg_enable;
1862 }
1863 
1864 /*
1865  * Use a low-level command to change the LED behavior. Rather than
1866  * blinking (which is the normal case), when identify is used, the
1867  * yellow LED turns solid.
1868  */
1869 static int myri10ge_led(struct myri10ge_priv *mgp, int on)
1870 {
1871 	struct mcp_gen_header *hdr;
1872 	struct device *dev = &mgp->pdev->dev;
1873 	size_t hdr_off, pattern_off, hdr_len;
1874 	u32 pattern = 0xfffffffe;
1875 
1876 	/* find running firmware header */
1877 	hdr_off = swab32(readl(mgp->sram + MCP_HEADER_PTR_OFFSET));
1878 	if ((hdr_off & 3) || hdr_off + sizeof(*hdr) > mgp->sram_size) {
1879 		dev_err(dev, "Running firmware has bad header offset (%d)\n",
1880 			(int)hdr_off);
1881 		return -EIO;
1882 	}
1883 	hdr_len = swab32(readl(mgp->sram + hdr_off +
1884 			       offsetof(struct mcp_gen_header, header_length)));
1885 	pattern_off = hdr_off + offsetof(struct mcp_gen_header, led_pattern);
1886 	if (pattern_off >= (hdr_len + hdr_off)) {
1887 		dev_info(dev, "Firmware does not support LED identification\n");
1888 		return -EINVAL;
1889 	}
1890 	if (!on)
1891 		pattern = swab32(readl(mgp->sram + pattern_off + 4));
1892 	writel(swab32(pattern), mgp->sram + pattern_off);
1893 	return 0;
1894 }
1895 
1896 static int
1897 myri10ge_phys_id(struct net_device *netdev, enum ethtool_phys_id_state state)
1898 {
1899 	struct myri10ge_priv *mgp = netdev_priv(netdev);
1900 	int rc;
1901 
1902 	switch (state) {
1903 	case ETHTOOL_ID_ACTIVE:
1904 		rc = myri10ge_led(mgp, 1);
1905 		break;
1906 
1907 	case ETHTOOL_ID_INACTIVE:
1908 		rc =  myri10ge_led(mgp, 0);
1909 		break;
1910 
1911 	default:
1912 		rc = -EINVAL;
1913 	}
1914 
1915 	return rc;
1916 }
1917 
1918 static const struct ethtool_ops myri10ge_ethtool_ops = {
1919 	.supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS,
1920 	.get_drvinfo = myri10ge_get_drvinfo,
1921 	.get_coalesce = myri10ge_get_coalesce,
1922 	.set_coalesce = myri10ge_set_coalesce,
1923 	.get_pauseparam = myri10ge_get_pauseparam,
1924 	.set_pauseparam = myri10ge_set_pauseparam,
1925 	.get_ringparam = myri10ge_get_ringparam,
1926 	.get_link = ethtool_op_get_link,
1927 	.get_strings = myri10ge_get_strings,
1928 	.get_sset_count = myri10ge_get_sset_count,
1929 	.get_ethtool_stats = myri10ge_get_ethtool_stats,
1930 	.set_msglevel = myri10ge_set_msglevel,
1931 	.get_msglevel = myri10ge_get_msglevel,
1932 	.set_phys_id = myri10ge_phys_id,
1933 	.get_link_ksettings = myri10ge_get_link_ksettings,
1934 };
1935 
1936 static int myri10ge_allocate_rings(struct myri10ge_slice_state *ss)
1937 {
1938 	struct myri10ge_priv *mgp = ss->mgp;
1939 	struct myri10ge_cmd cmd;
1940 	struct net_device *dev = mgp->dev;
1941 	int tx_ring_size, rx_ring_size;
1942 	int tx_ring_entries, rx_ring_entries;
1943 	int i, slice, status;
1944 	size_t bytes;
1945 
1946 	/* get ring sizes */
1947 	slice = ss - mgp->ss;
1948 	cmd.data0 = slice;
1949 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_SEND_RING_SIZE, &cmd, 0);
1950 	tx_ring_size = cmd.data0;
1951 	cmd.data0 = slice;
1952 	status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_RX_RING_SIZE, &cmd, 0);
1953 	if (status != 0)
1954 		return status;
1955 	rx_ring_size = cmd.data0;
1956 
1957 	tx_ring_entries = tx_ring_size / sizeof(struct mcp_kreq_ether_send);
1958 	rx_ring_entries = rx_ring_size / sizeof(struct mcp_dma_addr);
1959 	ss->tx.mask = tx_ring_entries - 1;
1960 	ss->rx_small.mask = ss->rx_big.mask = rx_ring_entries - 1;
1961 
1962 	status = -ENOMEM;
1963 
1964 	/* allocate the host shadow rings */
1965 
1966 	bytes = 8 + (MYRI10GE_MAX_SEND_DESC_TSO + 4)
1967 	    * sizeof(*ss->tx.req_list);
1968 	ss->tx.req_bytes = kzalloc(bytes, GFP_KERNEL);
1969 	if (ss->tx.req_bytes == NULL)
1970 		goto abort_with_nothing;
1971 
1972 	/* ensure req_list entries are aligned to 8 bytes */
1973 	ss->tx.req_list = (struct mcp_kreq_ether_send *)
1974 	    ALIGN((unsigned long)ss->tx.req_bytes, 8);
1975 	ss->tx.queue_active = 0;
1976 
1977 	bytes = rx_ring_entries * sizeof(*ss->rx_small.shadow);
1978 	ss->rx_small.shadow = kzalloc(bytes, GFP_KERNEL);
1979 	if (ss->rx_small.shadow == NULL)
1980 		goto abort_with_tx_req_bytes;
1981 
1982 	bytes = rx_ring_entries * sizeof(*ss->rx_big.shadow);
1983 	ss->rx_big.shadow = kzalloc(bytes, GFP_KERNEL);
1984 	if (ss->rx_big.shadow == NULL)
1985 		goto abort_with_rx_small_shadow;
1986 
1987 	/* allocate the host info rings */
1988 
1989 	bytes = tx_ring_entries * sizeof(*ss->tx.info);
1990 	ss->tx.info = kzalloc(bytes, GFP_KERNEL);
1991 	if (ss->tx.info == NULL)
1992 		goto abort_with_rx_big_shadow;
1993 
1994 	bytes = rx_ring_entries * sizeof(*ss->rx_small.info);
1995 	ss->rx_small.info = kzalloc(bytes, GFP_KERNEL);
1996 	if (ss->rx_small.info == NULL)
1997 		goto abort_with_tx_info;
1998 
1999 	bytes = rx_ring_entries * sizeof(*ss->rx_big.info);
2000 	ss->rx_big.info = kzalloc(bytes, GFP_KERNEL);
2001 	if (ss->rx_big.info == NULL)
2002 		goto abort_with_rx_small_info;
2003 
2004 	/* Fill the receive rings */
2005 	ss->rx_big.cnt = 0;
2006 	ss->rx_small.cnt = 0;
2007 	ss->rx_big.fill_cnt = 0;
2008 	ss->rx_small.fill_cnt = 0;
2009 	ss->rx_small.page_offset = MYRI10GE_ALLOC_SIZE;
2010 	ss->rx_big.page_offset = MYRI10GE_ALLOC_SIZE;
2011 	ss->rx_small.watchdog_needed = 0;
2012 	ss->rx_big.watchdog_needed = 0;
2013 	if (mgp->small_bytes == 0) {
2014 		ss->rx_small.fill_cnt = ss->rx_small.mask + 1;
2015 	} else {
2016 		myri10ge_alloc_rx_pages(mgp, &ss->rx_small,
2017 					mgp->small_bytes + MXGEFW_PAD, 0);
2018 	}
2019 
2020 	if (ss->rx_small.fill_cnt < ss->rx_small.mask + 1) {
2021 		netdev_err(dev, "slice-%d: alloced only %d small bufs\n",
2022 			   slice, ss->rx_small.fill_cnt);
2023 		goto abort_with_rx_small_ring;
2024 	}
2025 
2026 	myri10ge_alloc_rx_pages(mgp, &ss->rx_big, mgp->big_bytes, 0);
2027 	if (ss->rx_big.fill_cnt < ss->rx_big.mask + 1) {
2028 		netdev_err(dev, "slice-%d: alloced only %d big bufs\n",
2029 			   slice, ss->rx_big.fill_cnt);
2030 		goto abort_with_rx_big_ring;
2031 	}
2032 
2033 	return 0;
2034 
2035 abort_with_rx_big_ring:
2036 	for (i = ss->rx_big.cnt; i < ss->rx_big.fill_cnt; i++) {
2037 		int idx = i & ss->rx_big.mask;
2038 		myri10ge_unmap_rx_page(mgp->pdev, &ss->rx_big.info[idx],
2039 				       mgp->big_bytes);
2040 		put_page(ss->rx_big.info[idx].page);
2041 	}
2042 
2043 abort_with_rx_small_ring:
2044 	if (mgp->small_bytes == 0)
2045 		ss->rx_small.fill_cnt = ss->rx_small.cnt;
2046 	for (i = ss->rx_small.cnt; i < ss->rx_small.fill_cnt; i++) {
2047 		int idx = i & ss->rx_small.mask;
2048 		myri10ge_unmap_rx_page(mgp->pdev, &ss->rx_small.info[idx],
2049 				       mgp->small_bytes + MXGEFW_PAD);
2050 		put_page(ss->rx_small.info[idx].page);
2051 	}
2052 
2053 	kfree(ss->rx_big.info);
2054 
2055 abort_with_rx_small_info:
2056 	kfree(ss->rx_small.info);
2057 
2058 abort_with_tx_info:
2059 	kfree(ss->tx.info);
2060 
2061 abort_with_rx_big_shadow:
2062 	kfree(ss->rx_big.shadow);
2063 
2064 abort_with_rx_small_shadow:
2065 	kfree(ss->rx_small.shadow);
2066 
2067 abort_with_tx_req_bytes:
2068 	kfree(ss->tx.req_bytes);
2069 	ss->tx.req_bytes = NULL;
2070 	ss->tx.req_list = NULL;
2071 
2072 abort_with_nothing:
2073 	return status;
2074 }
2075 
2076 static void myri10ge_free_rings(struct myri10ge_slice_state *ss)
2077 {
2078 	struct myri10ge_priv *mgp = ss->mgp;
2079 	struct sk_buff *skb;
2080 	struct myri10ge_tx_buf *tx;
2081 	int i, len, idx;
2082 
2083 	/* If not allocated, skip it */
2084 	if (ss->tx.req_list == NULL)
2085 		return;
2086 
2087 	for (i = ss->rx_big.cnt; i < ss->rx_big.fill_cnt; i++) {
2088 		idx = i & ss->rx_big.mask;
2089 		if (i == ss->rx_big.fill_cnt - 1)
2090 			ss->rx_big.info[idx].page_offset = MYRI10GE_ALLOC_SIZE;
2091 		myri10ge_unmap_rx_page(mgp->pdev, &ss->rx_big.info[idx],
2092 				       mgp->big_bytes);
2093 		put_page(ss->rx_big.info[idx].page);
2094 	}
2095 
2096 	if (mgp->small_bytes == 0)
2097 		ss->rx_small.fill_cnt = ss->rx_small.cnt;
2098 	for (i = ss->rx_small.cnt; i < ss->rx_small.fill_cnt; i++) {
2099 		idx = i & ss->rx_small.mask;
2100 		if (i == ss->rx_small.fill_cnt - 1)
2101 			ss->rx_small.info[idx].page_offset =
2102 			    MYRI10GE_ALLOC_SIZE;
2103 		myri10ge_unmap_rx_page(mgp->pdev, &ss->rx_small.info[idx],
2104 				       mgp->small_bytes + MXGEFW_PAD);
2105 		put_page(ss->rx_small.info[idx].page);
2106 	}
2107 	tx = &ss->tx;
2108 	while (tx->done != tx->req) {
2109 		idx = tx->done & tx->mask;
2110 		skb = tx->info[idx].skb;
2111 
2112 		/* Mark as free */
2113 		tx->info[idx].skb = NULL;
2114 		tx->done++;
2115 		len = dma_unmap_len(&tx->info[idx], len);
2116 		dma_unmap_len_set(&tx->info[idx], len, 0);
2117 		if (skb) {
2118 			ss->stats.tx_dropped++;
2119 			dev_kfree_skb_any(skb);
2120 			if (len)
2121 				dma_unmap_single(&mgp->pdev->dev,
2122 						 dma_unmap_addr(&tx->info[idx],
2123 								bus), len,
2124 						 DMA_TO_DEVICE);
2125 		} else {
2126 			if (len)
2127 				dma_unmap_page(&mgp->pdev->dev,
2128 					       dma_unmap_addr(&tx->info[idx],
2129 							      bus), len,
2130 					       DMA_TO_DEVICE);
2131 		}
2132 	}
2133 	kfree(ss->rx_big.info);
2134 
2135 	kfree(ss->rx_small.info);
2136 
2137 	kfree(ss->tx.info);
2138 
2139 	kfree(ss->rx_big.shadow);
2140 
2141 	kfree(ss->rx_small.shadow);
2142 
2143 	kfree(ss->tx.req_bytes);
2144 	ss->tx.req_bytes = NULL;
2145 	ss->tx.req_list = NULL;
2146 }
2147 
2148 static int myri10ge_request_irq(struct myri10ge_priv *mgp)
2149 {
2150 	struct pci_dev *pdev = mgp->pdev;
2151 	struct myri10ge_slice_state *ss;
2152 	struct net_device *netdev = mgp->dev;
2153 	int i;
2154 	int status;
2155 
2156 	mgp->msi_enabled = 0;
2157 	mgp->msix_enabled = 0;
2158 	status = 0;
2159 	if (myri10ge_msi) {
2160 		if (mgp->num_slices > 1) {
2161 			status = pci_enable_msix_range(pdev, mgp->msix_vectors,
2162 					mgp->num_slices, mgp->num_slices);
2163 			if (status < 0) {
2164 				dev_err(&pdev->dev,
2165 					"Error %d setting up MSI-X\n", status);
2166 				return status;
2167 			}
2168 			mgp->msix_enabled = 1;
2169 		}
2170 		if (mgp->msix_enabled == 0) {
2171 			status = pci_enable_msi(pdev);
2172 			if (status != 0) {
2173 				dev_err(&pdev->dev,
2174 					"Error %d setting up MSI; falling back to xPIC\n",
2175 					status);
2176 			} else {
2177 				mgp->msi_enabled = 1;
2178 			}
2179 		}
2180 	}
2181 	if (mgp->msix_enabled) {
2182 		for (i = 0; i < mgp->num_slices; i++) {
2183 			ss = &mgp->ss[i];
2184 			snprintf(ss->irq_desc, sizeof(ss->irq_desc),
2185 				 "%s:slice-%d", netdev->name, i);
2186 			status = request_irq(mgp->msix_vectors[i].vector,
2187 					     myri10ge_intr, 0, ss->irq_desc,
2188 					     ss);
2189 			if (status != 0) {
2190 				dev_err(&pdev->dev,
2191 					"slice %d failed to allocate IRQ\n", i);
2192 				i--;
2193 				while (i >= 0) {
2194 					free_irq(mgp->msix_vectors[i].vector,
2195 						 &mgp->ss[i]);
2196 					i--;
2197 				}
2198 				pci_disable_msix(pdev);
2199 				return status;
2200 			}
2201 		}
2202 	} else {
2203 		status = request_irq(pdev->irq, myri10ge_intr, IRQF_SHARED,
2204 				     mgp->dev->name, &mgp->ss[0]);
2205 		if (status != 0) {
2206 			dev_err(&pdev->dev, "failed to allocate IRQ\n");
2207 			if (mgp->msi_enabled)
2208 				pci_disable_msi(pdev);
2209 		}
2210 	}
2211 	return status;
2212 }
2213 
2214 static void myri10ge_free_irq(struct myri10ge_priv *mgp)
2215 {
2216 	struct pci_dev *pdev = mgp->pdev;
2217 	int i;
2218 
2219 	if (mgp->msix_enabled) {
2220 		for (i = 0; i < mgp->num_slices; i++)
2221 			free_irq(mgp->msix_vectors[i].vector, &mgp->ss[i]);
2222 	} else {
2223 		free_irq(pdev->irq, &mgp->ss[0]);
2224 	}
2225 	if (mgp->msi_enabled)
2226 		pci_disable_msi(pdev);
2227 	if (mgp->msix_enabled)
2228 		pci_disable_msix(pdev);
2229 }
2230 
2231 static int myri10ge_get_txrx(struct myri10ge_priv *mgp, int slice)
2232 {
2233 	struct myri10ge_cmd cmd;
2234 	struct myri10ge_slice_state *ss;
2235 	int status;
2236 
2237 	ss = &mgp->ss[slice];
2238 	status = 0;
2239 	if (slice == 0 || (mgp->dev->real_num_tx_queues > 1)) {
2240 		cmd.data0 = slice;
2241 		status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_SEND_OFFSET,
2242 					   &cmd, 0);
2243 		ss->tx.lanai = (struct mcp_kreq_ether_send __iomem *)
2244 		    (mgp->sram + cmd.data0);
2245 	}
2246 	cmd.data0 = slice;
2247 	status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_SMALL_RX_OFFSET,
2248 				    &cmd, 0);
2249 	ss->rx_small.lanai = (struct mcp_kreq_ether_recv __iomem *)
2250 	    (mgp->sram + cmd.data0);
2251 
2252 	cmd.data0 = slice;
2253 	status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_BIG_RX_OFFSET, &cmd, 0);
2254 	ss->rx_big.lanai = (struct mcp_kreq_ether_recv __iomem *)
2255 	    (mgp->sram + cmd.data0);
2256 
2257 	ss->tx.send_go = (__iomem __be32 *)
2258 	    (mgp->sram + MXGEFW_ETH_SEND_GO + 64 * slice);
2259 	ss->tx.send_stop = (__iomem __be32 *)
2260 	    (mgp->sram + MXGEFW_ETH_SEND_STOP + 64 * slice);
2261 	return status;
2262 
2263 }
2264 
2265 static int myri10ge_set_stats(struct myri10ge_priv *mgp, int slice)
2266 {
2267 	struct myri10ge_cmd cmd;
2268 	struct myri10ge_slice_state *ss;
2269 	int status;
2270 
2271 	ss = &mgp->ss[slice];
2272 	cmd.data0 = MYRI10GE_LOWPART_TO_U32(ss->fw_stats_bus);
2273 	cmd.data1 = MYRI10GE_HIGHPART_TO_U32(ss->fw_stats_bus);
2274 	cmd.data2 = sizeof(struct mcp_irq_data) | (slice << 16);
2275 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_STATS_DMA_V2, &cmd, 0);
2276 	if (status == -ENOSYS) {
2277 		dma_addr_t bus = ss->fw_stats_bus;
2278 		if (slice != 0)
2279 			return -EINVAL;
2280 		bus += offsetof(struct mcp_irq_data, send_done_count);
2281 		cmd.data0 = MYRI10GE_LOWPART_TO_U32(bus);
2282 		cmd.data1 = MYRI10GE_HIGHPART_TO_U32(bus);
2283 		status = myri10ge_send_cmd(mgp,
2284 					   MXGEFW_CMD_SET_STATS_DMA_OBSOLETE,
2285 					   &cmd, 0);
2286 		/* Firmware cannot support multicast without STATS_DMA_V2 */
2287 		mgp->fw_multicast_support = 0;
2288 	} else {
2289 		mgp->fw_multicast_support = 1;
2290 	}
2291 	return 0;
2292 }
2293 
2294 static int myri10ge_open(struct net_device *dev)
2295 {
2296 	struct myri10ge_slice_state *ss;
2297 	struct myri10ge_priv *mgp = netdev_priv(dev);
2298 	struct myri10ge_cmd cmd;
2299 	int i, status, big_pow2, slice;
2300 	u8 __iomem *itable;
2301 
2302 	if (mgp->running != MYRI10GE_ETH_STOPPED)
2303 		return -EBUSY;
2304 
2305 	mgp->running = MYRI10GE_ETH_STARTING;
2306 	status = myri10ge_reset(mgp);
2307 	if (status != 0) {
2308 		netdev_err(dev, "failed reset\n");
2309 		goto abort_with_nothing;
2310 	}
2311 
2312 	if (mgp->num_slices > 1) {
2313 		cmd.data0 = mgp->num_slices;
2314 		cmd.data1 = MXGEFW_SLICE_INTR_MODE_ONE_PER_SLICE;
2315 		if (mgp->dev->real_num_tx_queues > 1)
2316 			cmd.data1 |= MXGEFW_SLICE_ENABLE_MULTIPLE_TX_QUEUES;
2317 		status = myri10ge_send_cmd(mgp, MXGEFW_CMD_ENABLE_RSS_QUEUES,
2318 					   &cmd, 0);
2319 		if (status != 0) {
2320 			netdev_err(dev, "failed to set number of slices\n");
2321 			goto abort_with_nothing;
2322 		}
2323 		/* setup the indirection table */
2324 		cmd.data0 = mgp->num_slices;
2325 		status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_RSS_TABLE_SIZE,
2326 					   &cmd, 0);
2327 
2328 		status |= myri10ge_send_cmd(mgp,
2329 					    MXGEFW_CMD_GET_RSS_TABLE_OFFSET,
2330 					    &cmd, 0);
2331 		if (status != 0) {
2332 			netdev_err(dev, "failed to setup rss tables\n");
2333 			goto abort_with_nothing;
2334 		}
2335 
2336 		/* just enable an identity mapping */
2337 		itable = mgp->sram + cmd.data0;
2338 		for (i = 0; i < mgp->num_slices; i++)
2339 			__raw_writeb(i, &itable[i]);
2340 
2341 		cmd.data0 = 1;
2342 		cmd.data1 = myri10ge_rss_hash;
2343 		status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_RSS_ENABLE,
2344 					   &cmd, 0);
2345 		if (status != 0) {
2346 			netdev_err(dev, "failed to enable slices\n");
2347 			goto abort_with_nothing;
2348 		}
2349 	}
2350 
2351 	status = myri10ge_request_irq(mgp);
2352 	if (status != 0)
2353 		goto abort_with_nothing;
2354 
2355 	/* decide what small buffer size to use.  For good TCP rx
2356 	 * performance, it is important to not receive 1514 byte
2357 	 * frames into jumbo buffers, as it confuses the socket buffer
2358 	 * accounting code, leading to drops and erratic performance.
2359 	 */
2360 
2361 	if (dev->mtu <= ETH_DATA_LEN)
2362 		/* enough for a TCP header */
2363 		mgp->small_bytes = (128 > SMP_CACHE_BYTES)
2364 		    ? (128 - MXGEFW_PAD)
2365 		    : (SMP_CACHE_BYTES - MXGEFW_PAD);
2366 	else
2367 		/* enough for a vlan encapsulated ETH_DATA_LEN frame */
2368 		mgp->small_bytes = VLAN_ETH_FRAME_LEN;
2369 
2370 	/* Override the small buffer size? */
2371 	if (myri10ge_small_bytes >= 0)
2372 		mgp->small_bytes = myri10ge_small_bytes;
2373 
2374 	/* Firmware needs the big buff size as a power of 2.  Lie and
2375 	 * tell him the buffer is larger, because we only use 1
2376 	 * buffer/pkt, and the mtu will prevent overruns.
2377 	 */
2378 	big_pow2 = dev->mtu + ETH_HLEN + VLAN_HLEN + MXGEFW_PAD;
2379 	if (big_pow2 < MYRI10GE_ALLOC_SIZE / 2) {
2380 		while (!is_power_of_2(big_pow2))
2381 			big_pow2++;
2382 		mgp->big_bytes = dev->mtu + ETH_HLEN + VLAN_HLEN + MXGEFW_PAD;
2383 	} else {
2384 		big_pow2 = MYRI10GE_ALLOC_SIZE;
2385 		mgp->big_bytes = big_pow2;
2386 	}
2387 
2388 	/* setup the per-slice data structures */
2389 	for (slice = 0; slice < mgp->num_slices; slice++) {
2390 		ss = &mgp->ss[slice];
2391 
2392 		status = myri10ge_get_txrx(mgp, slice);
2393 		if (status != 0) {
2394 			netdev_err(dev, "failed to get ring sizes or locations\n");
2395 			goto abort_with_rings;
2396 		}
2397 		status = myri10ge_allocate_rings(ss);
2398 		if (status != 0)
2399 			goto abort_with_rings;
2400 
2401 		/* only firmware which supports multiple TX queues
2402 		 * supports setting up the tx stats on non-zero
2403 		 * slices */
2404 		if (slice == 0 || mgp->dev->real_num_tx_queues > 1)
2405 			status = myri10ge_set_stats(mgp, slice);
2406 		if (status) {
2407 			netdev_err(dev, "Couldn't set stats DMA\n");
2408 			goto abort_with_rings;
2409 		}
2410 
2411 		/* must happen prior to any irq */
2412 		napi_enable(&(ss)->napi);
2413 	}
2414 
2415 	/* now give firmware buffers sizes, and MTU */
2416 	cmd.data0 = dev->mtu + ETH_HLEN + VLAN_HLEN;
2417 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_MTU, &cmd, 0);
2418 	cmd.data0 = mgp->small_bytes;
2419 	status |=
2420 	    myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_SMALL_BUFFER_SIZE, &cmd, 0);
2421 	cmd.data0 = big_pow2;
2422 	status |=
2423 	    myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_BIG_BUFFER_SIZE, &cmd, 0);
2424 	if (status) {
2425 		netdev_err(dev, "Couldn't set buffer sizes\n");
2426 		goto abort_with_rings;
2427 	}
2428 
2429 	/*
2430 	 * Set Linux style TSO mode; this is needed only on newer
2431 	 *  firmware versions.  Older versions default to Linux
2432 	 *  style TSO
2433 	 */
2434 	cmd.data0 = 0;
2435 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_TSO_MODE, &cmd, 0);
2436 	if (status && status != -ENOSYS) {
2437 		netdev_err(dev, "Couldn't set TSO mode\n");
2438 		goto abort_with_rings;
2439 	}
2440 
2441 	mgp->link_state = ~0U;
2442 	mgp->rdma_tags_available = 15;
2443 
2444 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_ETHERNET_UP, &cmd, 0);
2445 	if (status) {
2446 		netdev_err(dev, "Couldn't bring up link\n");
2447 		goto abort_with_rings;
2448 	}
2449 
2450 	mgp->running = MYRI10GE_ETH_RUNNING;
2451 	mgp->watchdog_timer.expires = jiffies + myri10ge_watchdog_timeout * HZ;
2452 	add_timer(&mgp->watchdog_timer);
2453 	netif_tx_wake_all_queues(dev);
2454 
2455 	return 0;
2456 
2457 abort_with_rings:
2458 	while (slice) {
2459 		slice--;
2460 		napi_disable(&mgp->ss[slice].napi);
2461 	}
2462 	for (i = 0; i < mgp->num_slices; i++)
2463 		myri10ge_free_rings(&mgp->ss[i]);
2464 
2465 	myri10ge_free_irq(mgp);
2466 
2467 abort_with_nothing:
2468 	mgp->running = MYRI10GE_ETH_STOPPED;
2469 	return -ENOMEM;
2470 }
2471 
2472 static int myri10ge_close(struct net_device *dev)
2473 {
2474 	struct myri10ge_priv *mgp = netdev_priv(dev);
2475 	struct myri10ge_cmd cmd;
2476 	int status, old_down_cnt;
2477 	int i;
2478 
2479 	if (mgp->running != MYRI10GE_ETH_RUNNING)
2480 		return 0;
2481 
2482 	if (mgp->ss[0].tx.req_bytes == NULL)
2483 		return 0;
2484 
2485 	del_timer_sync(&mgp->watchdog_timer);
2486 	mgp->running = MYRI10GE_ETH_STOPPING;
2487 	for (i = 0; i < mgp->num_slices; i++)
2488 		napi_disable(&mgp->ss[i].napi);
2489 
2490 	netif_carrier_off(dev);
2491 
2492 	netif_tx_stop_all_queues(dev);
2493 	if (mgp->rebooted == 0) {
2494 		old_down_cnt = mgp->down_cnt;
2495 		mb();
2496 		status =
2497 		    myri10ge_send_cmd(mgp, MXGEFW_CMD_ETHERNET_DOWN, &cmd, 0);
2498 		if (status)
2499 			netdev_err(dev, "Couldn't bring down link\n");
2500 
2501 		wait_event_timeout(mgp->down_wq, old_down_cnt != mgp->down_cnt,
2502 				   HZ);
2503 		if (old_down_cnt == mgp->down_cnt)
2504 			netdev_err(dev, "never got down irq\n");
2505 	}
2506 	netif_tx_disable(dev);
2507 	myri10ge_free_irq(mgp);
2508 	for (i = 0; i < mgp->num_slices; i++)
2509 		myri10ge_free_rings(&mgp->ss[i]);
2510 
2511 	mgp->running = MYRI10GE_ETH_STOPPED;
2512 	return 0;
2513 }
2514 
2515 /* copy an array of struct mcp_kreq_ether_send's to the mcp.  Copy
2516  * backwards one at a time and handle ring wraps */
2517 
2518 static inline void
2519 myri10ge_submit_req_backwards(struct myri10ge_tx_buf *tx,
2520 			      struct mcp_kreq_ether_send *src, int cnt)
2521 {
2522 	int idx, starting_slot;
2523 	starting_slot = tx->req;
2524 	while (cnt > 1) {
2525 		cnt--;
2526 		idx = (starting_slot + cnt) & tx->mask;
2527 		myri10ge_pio_copy(&tx->lanai[idx], &src[cnt], sizeof(*src));
2528 		mb();
2529 	}
2530 }
2531 
2532 /*
2533  * copy an array of struct mcp_kreq_ether_send's to the mcp.  Copy
2534  * at most 32 bytes at a time, so as to avoid involving the software
2535  * pio handler in the nic.   We re-write the first segment's flags
2536  * to mark them valid only after writing the entire chain.
2537  */
2538 
2539 static inline void
2540 myri10ge_submit_req(struct myri10ge_tx_buf *tx, struct mcp_kreq_ether_send *src,
2541 		    int cnt)
2542 {
2543 	int idx, i;
2544 	struct mcp_kreq_ether_send __iomem *dstp, *dst;
2545 	struct mcp_kreq_ether_send *srcp;
2546 	u8 last_flags;
2547 
2548 	idx = tx->req & tx->mask;
2549 
2550 	last_flags = src->flags;
2551 	src->flags = 0;
2552 	mb();
2553 	dst = dstp = &tx->lanai[idx];
2554 	srcp = src;
2555 
2556 	if ((idx + cnt) < tx->mask) {
2557 		for (i = 0; i < (cnt - 1); i += 2) {
2558 			myri10ge_pio_copy(dstp, srcp, 2 * sizeof(*src));
2559 			mb();	/* force write every 32 bytes */
2560 			srcp += 2;
2561 			dstp += 2;
2562 		}
2563 	} else {
2564 		/* submit all but the first request, and ensure
2565 		 * that it is submitted below */
2566 		myri10ge_submit_req_backwards(tx, src, cnt);
2567 		i = 0;
2568 	}
2569 	if (i < cnt) {
2570 		/* submit the first request */
2571 		myri10ge_pio_copy(dstp, srcp, sizeof(*src));
2572 		mb();		/* barrier before setting valid flag */
2573 	}
2574 
2575 	/* re-write the last 32-bits with the valid flags */
2576 	src->flags = last_flags;
2577 	put_be32(*((__be32 *) src + 3), (__be32 __iomem *) dst + 3);
2578 	tx->req += cnt;
2579 	mb();
2580 }
2581 
2582 static void myri10ge_unmap_tx_dma(struct myri10ge_priv *mgp,
2583 				  struct myri10ge_tx_buf *tx, int idx)
2584 {
2585 	unsigned int len;
2586 	int last_idx;
2587 
2588 	/* Free any DMA resources we've alloced and clear out the skb slot */
2589 	last_idx = (idx + 1) & tx->mask;
2590 	idx = tx->req & tx->mask;
2591 	do {
2592 		len = dma_unmap_len(&tx->info[idx], len);
2593 		if (len) {
2594 			if (tx->info[idx].skb != NULL)
2595 				dma_unmap_single(&mgp->pdev->dev,
2596 						 dma_unmap_addr(&tx->info[idx],
2597 								bus), len,
2598 						 DMA_TO_DEVICE);
2599 			else
2600 				dma_unmap_page(&mgp->pdev->dev,
2601 					       dma_unmap_addr(&tx->info[idx],
2602 							      bus), len,
2603 					       DMA_TO_DEVICE);
2604 			dma_unmap_len_set(&tx->info[idx], len, 0);
2605 			tx->info[idx].skb = NULL;
2606 		}
2607 		idx = (idx + 1) & tx->mask;
2608 	} while (idx != last_idx);
2609 }
2610 
2611 /*
2612  * Transmit a packet.  We need to split the packet so that a single
2613  * segment does not cross myri10ge->tx_boundary, so this makes segment
2614  * counting tricky.  So rather than try to count segments up front, we
2615  * just give up if there are too few segments to hold a reasonably
2616  * fragmented packet currently available.  If we run
2617  * out of segments while preparing a packet for DMA, we just linearize
2618  * it and try again.
2619  */
2620 
2621 static netdev_tx_t myri10ge_xmit(struct sk_buff *skb,
2622 				       struct net_device *dev)
2623 {
2624 	struct myri10ge_priv *mgp = netdev_priv(dev);
2625 	struct myri10ge_slice_state *ss;
2626 	struct mcp_kreq_ether_send *req;
2627 	struct myri10ge_tx_buf *tx;
2628 	skb_frag_t *frag;
2629 	struct netdev_queue *netdev_queue;
2630 	dma_addr_t bus;
2631 	u32 low;
2632 	__be32 high_swapped;
2633 	unsigned int len;
2634 	int idx, avail, frag_cnt, frag_idx, count, mss, max_segments;
2635 	u16 pseudo_hdr_offset, cksum_offset, queue;
2636 	int cum_len, seglen, boundary, rdma_count;
2637 	u8 flags, odd_flag;
2638 
2639 	queue = skb_get_queue_mapping(skb);
2640 	ss = &mgp->ss[queue];
2641 	netdev_queue = netdev_get_tx_queue(mgp->dev, queue);
2642 	tx = &ss->tx;
2643 
2644 again:
2645 	req = tx->req_list;
2646 	avail = tx->mask - 1 - (tx->req - tx->done);
2647 
2648 	mss = 0;
2649 	max_segments = MXGEFW_MAX_SEND_DESC;
2650 
2651 	if (skb_is_gso(skb)) {
2652 		mss = skb_shinfo(skb)->gso_size;
2653 		max_segments = MYRI10GE_MAX_SEND_DESC_TSO;
2654 	}
2655 
2656 	if ((unlikely(avail < max_segments))) {
2657 		/* we are out of transmit resources */
2658 		tx->stop_queue++;
2659 		netif_tx_stop_queue(netdev_queue);
2660 		return NETDEV_TX_BUSY;
2661 	}
2662 
2663 	/* Setup checksum offloading, if needed */
2664 	cksum_offset = 0;
2665 	pseudo_hdr_offset = 0;
2666 	odd_flag = 0;
2667 	flags = (MXGEFW_FLAGS_NO_TSO | MXGEFW_FLAGS_FIRST);
2668 	if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
2669 		cksum_offset = skb_checksum_start_offset(skb);
2670 		pseudo_hdr_offset = cksum_offset + skb->csum_offset;
2671 		/* If the headers are excessively large, then we must
2672 		 * fall back to a software checksum */
2673 		if (unlikely(!mss && (cksum_offset > 255 ||
2674 				      pseudo_hdr_offset > 127))) {
2675 			if (skb_checksum_help(skb))
2676 				goto drop;
2677 			cksum_offset = 0;
2678 			pseudo_hdr_offset = 0;
2679 		} else {
2680 			odd_flag = MXGEFW_FLAGS_ALIGN_ODD;
2681 			flags |= MXGEFW_FLAGS_CKSUM;
2682 		}
2683 	}
2684 
2685 	cum_len = 0;
2686 
2687 	if (mss) {		/* TSO */
2688 		/* this removes any CKSUM flag from before */
2689 		flags = (MXGEFW_FLAGS_TSO_HDR | MXGEFW_FLAGS_FIRST);
2690 
2691 		/* negative cum_len signifies to the
2692 		 * send loop that we are still in the
2693 		 * header portion of the TSO packet.
2694 		 * TSO header can be at most 1KB long */
2695 		cum_len = -skb_tcp_all_headers(skb);
2696 
2697 		/* for IPv6 TSO, the checksum offset stores the
2698 		 * TCP header length, to save the firmware from
2699 		 * the need to parse the headers */
2700 		if (skb_is_gso_v6(skb)) {
2701 			cksum_offset = tcp_hdrlen(skb);
2702 			/* Can only handle headers <= max_tso6 long */
2703 			if (unlikely(-cum_len > mgp->max_tso6))
2704 				return myri10ge_sw_tso(skb, dev);
2705 		}
2706 		/* for TSO, pseudo_hdr_offset holds mss.
2707 		 * The firmware figures out where to put
2708 		 * the checksum by parsing the header. */
2709 		pseudo_hdr_offset = mss;
2710 	} else
2711 		/* Mark small packets, and pad out tiny packets */
2712 	if (skb->len <= MXGEFW_SEND_SMALL_SIZE) {
2713 		flags |= MXGEFW_FLAGS_SMALL;
2714 
2715 		/* pad frames to at least ETH_ZLEN bytes */
2716 		if (eth_skb_pad(skb)) {
2717 			/* The packet is gone, so we must
2718 			 * return 0 */
2719 			ss->stats.tx_dropped += 1;
2720 			return NETDEV_TX_OK;
2721 		}
2722 	}
2723 
2724 	/* map the skb for DMA */
2725 	len = skb_headlen(skb);
2726 	bus = dma_map_single(&mgp->pdev->dev, skb->data, len, DMA_TO_DEVICE);
2727 	if (unlikely(dma_mapping_error(&mgp->pdev->dev, bus)))
2728 		goto drop;
2729 
2730 	idx = tx->req & tx->mask;
2731 	tx->info[idx].skb = skb;
2732 	dma_unmap_addr_set(&tx->info[idx], bus, bus);
2733 	dma_unmap_len_set(&tx->info[idx], len, len);
2734 
2735 	frag_cnt = skb_shinfo(skb)->nr_frags;
2736 	frag_idx = 0;
2737 	count = 0;
2738 	rdma_count = 0;
2739 
2740 	/* "rdma_count" is the number of RDMAs belonging to the
2741 	 * current packet BEFORE the current send request. For
2742 	 * non-TSO packets, this is equal to "count".
2743 	 * For TSO packets, rdma_count needs to be reset
2744 	 * to 0 after a segment cut.
2745 	 *
2746 	 * The rdma_count field of the send request is
2747 	 * the number of RDMAs of the packet starting at
2748 	 * that request. For TSO send requests with one ore more cuts
2749 	 * in the middle, this is the number of RDMAs starting
2750 	 * after the last cut in the request. All previous
2751 	 * segments before the last cut implicitly have 1 RDMA.
2752 	 *
2753 	 * Since the number of RDMAs is not known beforehand,
2754 	 * it must be filled-in retroactively - after each
2755 	 * segmentation cut or at the end of the entire packet.
2756 	 */
2757 
2758 	while (1) {
2759 		/* Break the SKB or Fragment up into pieces which
2760 		 * do not cross mgp->tx_boundary */
2761 		low = MYRI10GE_LOWPART_TO_U32(bus);
2762 		high_swapped = htonl(MYRI10GE_HIGHPART_TO_U32(bus));
2763 		while (len) {
2764 			u8 flags_next;
2765 			int cum_len_next;
2766 
2767 			if (unlikely(count == max_segments))
2768 				goto abort_linearize;
2769 
2770 			boundary =
2771 			    (low + mgp->tx_boundary) & ~(mgp->tx_boundary - 1);
2772 			seglen = boundary - low;
2773 			if (seglen > len)
2774 				seglen = len;
2775 			flags_next = flags & ~MXGEFW_FLAGS_FIRST;
2776 			cum_len_next = cum_len + seglen;
2777 			if (mss) {	/* TSO */
2778 				(req - rdma_count)->rdma_count = rdma_count + 1;
2779 
2780 				if (likely(cum_len >= 0)) {	/* payload */
2781 					int next_is_first, chop;
2782 
2783 					chop = (cum_len_next > mss);
2784 					cum_len_next = cum_len_next % mss;
2785 					next_is_first = (cum_len_next == 0);
2786 					flags |= chop * MXGEFW_FLAGS_TSO_CHOP;
2787 					flags_next |= next_is_first *
2788 					    MXGEFW_FLAGS_FIRST;
2789 					rdma_count |= -(chop | next_is_first);
2790 					rdma_count += chop & ~next_is_first;
2791 				} else if (likely(cum_len_next >= 0)) {	/* header ends */
2792 					int small;
2793 
2794 					rdma_count = -1;
2795 					cum_len_next = 0;
2796 					seglen = -cum_len;
2797 					small = (mss <= MXGEFW_SEND_SMALL_SIZE);
2798 					flags_next = MXGEFW_FLAGS_TSO_PLD |
2799 					    MXGEFW_FLAGS_FIRST |
2800 					    (small * MXGEFW_FLAGS_SMALL);
2801 				}
2802 			}
2803 			req->addr_high = high_swapped;
2804 			req->addr_low = htonl(low);
2805 			req->pseudo_hdr_offset = htons(pseudo_hdr_offset);
2806 			req->pad = 0;	/* complete solid 16-byte block; does this matter? */
2807 			req->rdma_count = 1;
2808 			req->length = htons(seglen);
2809 			req->cksum_offset = cksum_offset;
2810 			req->flags = flags | ((cum_len & 1) * odd_flag);
2811 
2812 			low += seglen;
2813 			len -= seglen;
2814 			cum_len = cum_len_next;
2815 			flags = flags_next;
2816 			req++;
2817 			count++;
2818 			rdma_count++;
2819 			if (cksum_offset != 0 && !(mss && skb_is_gso_v6(skb))) {
2820 				if (unlikely(cksum_offset > seglen))
2821 					cksum_offset -= seglen;
2822 				else
2823 					cksum_offset = 0;
2824 			}
2825 		}
2826 		if (frag_idx == frag_cnt)
2827 			break;
2828 
2829 		/* map next fragment for DMA */
2830 		frag = &skb_shinfo(skb)->frags[frag_idx];
2831 		frag_idx++;
2832 		len = skb_frag_size(frag);
2833 		bus = skb_frag_dma_map(&mgp->pdev->dev, frag, 0, len,
2834 				       DMA_TO_DEVICE);
2835 		if (unlikely(dma_mapping_error(&mgp->pdev->dev, bus))) {
2836 			myri10ge_unmap_tx_dma(mgp, tx, idx);
2837 			goto drop;
2838 		}
2839 		idx = (count + tx->req) & tx->mask;
2840 		dma_unmap_addr_set(&tx->info[idx], bus, bus);
2841 		dma_unmap_len_set(&tx->info[idx], len, len);
2842 	}
2843 
2844 	(req - rdma_count)->rdma_count = rdma_count;
2845 	if (mss)
2846 		do {
2847 			req--;
2848 			req->flags |= MXGEFW_FLAGS_TSO_LAST;
2849 		} while (!(req->flags & (MXGEFW_FLAGS_TSO_CHOP |
2850 					 MXGEFW_FLAGS_FIRST)));
2851 	idx = ((count - 1) + tx->req) & tx->mask;
2852 	tx->info[idx].last = 1;
2853 	myri10ge_submit_req(tx, tx->req_list, count);
2854 	/* if using multiple tx queues, make sure NIC polls the
2855 	 * current slice */
2856 	if ((mgp->dev->real_num_tx_queues > 1) && tx->queue_active == 0) {
2857 		tx->queue_active = 1;
2858 		put_be32(htonl(1), tx->send_go);
2859 		mb();
2860 	}
2861 	tx->pkt_start++;
2862 	if ((avail - count) < MXGEFW_MAX_SEND_DESC) {
2863 		tx->stop_queue++;
2864 		netif_tx_stop_queue(netdev_queue);
2865 	}
2866 	return NETDEV_TX_OK;
2867 
2868 abort_linearize:
2869 	myri10ge_unmap_tx_dma(mgp, tx, idx);
2870 
2871 	if (skb_is_gso(skb)) {
2872 		netdev_err(mgp->dev, "TSO but wanted to linearize?!?!?\n");
2873 		goto drop;
2874 	}
2875 
2876 	if (skb_linearize(skb))
2877 		goto drop;
2878 
2879 	tx->linearized++;
2880 	goto again;
2881 
2882 drop:
2883 	dev_kfree_skb_any(skb);
2884 	ss->stats.tx_dropped += 1;
2885 	return NETDEV_TX_OK;
2886 
2887 }
2888 
2889 static netdev_tx_t myri10ge_sw_tso(struct sk_buff *skb,
2890 					 struct net_device *dev)
2891 {
2892 	struct sk_buff *segs, *curr, *next;
2893 	struct myri10ge_priv *mgp = netdev_priv(dev);
2894 	struct myri10ge_slice_state *ss;
2895 	netdev_tx_t status;
2896 
2897 	segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO6);
2898 	if (IS_ERR(segs))
2899 		goto drop;
2900 
2901 	skb_list_walk_safe(segs, curr, next) {
2902 		skb_mark_not_on_list(curr);
2903 		status = myri10ge_xmit(curr, dev);
2904 		if (status != 0) {
2905 			dev_kfree_skb_any(curr);
2906 			skb_list_walk_safe(next, curr, next) {
2907 				curr->next = NULL;
2908 				dev_kfree_skb_any(curr);
2909 			}
2910 			goto drop;
2911 		}
2912 	}
2913 	dev_kfree_skb_any(skb);
2914 	return NETDEV_TX_OK;
2915 
2916 drop:
2917 	ss = &mgp->ss[skb_get_queue_mapping(skb)];
2918 	dev_kfree_skb_any(skb);
2919 	ss->stats.tx_dropped += 1;
2920 	return NETDEV_TX_OK;
2921 }
2922 
2923 static void myri10ge_get_stats(struct net_device *dev,
2924 			       struct rtnl_link_stats64 *stats)
2925 {
2926 	const struct myri10ge_priv *mgp = netdev_priv(dev);
2927 	const struct myri10ge_slice_netstats *slice_stats;
2928 	int i;
2929 
2930 	for (i = 0; i < mgp->num_slices; i++) {
2931 		slice_stats = &mgp->ss[i].stats;
2932 		stats->rx_packets += slice_stats->rx_packets;
2933 		stats->tx_packets += slice_stats->tx_packets;
2934 		stats->rx_bytes += slice_stats->rx_bytes;
2935 		stats->tx_bytes += slice_stats->tx_bytes;
2936 		stats->rx_dropped += slice_stats->rx_dropped;
2937 		stats->tx_dropped += slice_stats->tx_dropped;
2938 	}
2939 }
2940 
2941 static void myri10ge_set_multicast_list(struct net_device *dev)
2942 {
2943 	struct myri10ge_priv *mgp = netdev_priv(dev);
2944 	struct myri10ge_cmd cmd;
2945 	struct netdev_hw_addr *ha;
2946 	__be32 data[2] = { 0, 0 };
2947 	int err;
2948 
2949 	/* can be called from atomic contexts,
2950 	 * pass 1 to force atomicity in myri10ge_send_cmd() */
2951 	myri10ge_change_promisc(mgp, dev->flags & IFF_PROMISC, 1);
2952 
2953 	/* This firmware is known to not support multicast */
2954 	if (!mgp->fw_multicast_support)
2955 		return;
2956 
2957 	/* Disable multicast filtering */
2958 
2959 	err = myri10ge_send_cmd(mgp, MXGEFW_ENABLE_ALLMULTI, &cmd, 1);
2960 	if (err != 0) {
2961 		netdev_err(dev, "Failed MXGEFW_ENABLE_ALLMULTI, error status: %d\n",
2962 			   err);
2963 		goto abort;
2964 	}
2965 
2966 	if ((dev->flags & IFF_ALLMULTI) || mgp->adopted_rx_filter_bug) {
2967 		/* request to disable multicast filtering, so quit here */
2968 		return;
2969 	}
2970 
2971 	/* Flush the filters */
2972 
2973 	err = myri10ge_send_cmd(mgp, MXGEFW_LEAVE_ALL_MULTICAST_GROUPS,
2974 				&cmd, 1);
2975 	if (err != 0) {
2976 		netdev_err(dev, "Failed MXGEFW_LEAVE_ALL_MULTICAST_GROUPS, error status: %d\n",
2977 			   err);
2978 		goto abort;
2979 	}
2980 
2981 	/* Walk the multicast list, and add each address */
2982 	netdev_for_each_mc_addr(ha, dev) {
2983 		memcpy(data, &ha->addr, ETH_ALEN);
2984 		cmd.data0 = ntohl(data[0]);
2985 		cmd.data1 = ntohl(data[1]);
2986 		err = myri10ge_send_cmd(mgp, MXGEFW_JOIN_MULTICAST_GROUP,
2987 					&cmd, 1);
2988 
2989 		if (err != 0) {
2990 			netdev_err(dev, "Failed MXGEFW_JOIN_MULTICAST_GROUP, error status:%d %pM\n",
2991 				   err, ha->addr);
2992 			goto abort;
2993 		}
2994 	}
2995 	/* Enable multicast filtering */
2996 	err = myri10ge_send_cmd(mgp, MXGEFW_DISABLE_ALLMULTI, &cmd, 1);
2997 	if (err != 0) {
2998 		netdev_err(dev, "Failed MXGEFW_DISABLE_ALLMULTI, error status: %d\n",
2999 			   err);
3000 		goto abort;
3001 	}
3002 
3003 	return;
3004 
3005 abort:
3006 	return;
3007 }
3008 
3009 static int myri10ge_set_mac_address(struct net_device *dev, void *addr)
3010 {
3011 	struct sockaddr *sa = addr;
3012 	struct myri10ge_priv *mgp = netdev_priv(dev);
3013 	int status;
3014 
3015 	if (!is_valid_ether_addr(sa->sa_data))
3016 		return -EADDRNOTAVAIL;
3017 
3018 	status = myri10ge_update_mac_address(mgp, sa->sa_data);
3019 	if (status != 0) {
3020 		netdev_err(dev, "changing mac address failed with %d\n",
3021 			   status);
3022 		return status;
3023 	}
3024 
3025 	/* change the dev structure */
3026 	eth_hw_addr_set(dev, sa->sa_data);
3027 	return 0;
3028 }
3029 
3030 static int myri10ge_change_mtu(struct net_device *dev, int new_mtu)
3031 {
3032 	struct myri10ge_priv *mgp = netdev_priv(dev);
3033 
3034 	netdev_info(dev, "changing mtu from %d to %d\n", dev->mtu, new_mtu);
3035 	if (mgp->running) {
3036 		/* if we change the mtu on an active device, we must
3037 		 * reset the device so the firmware sees the change */
3038 		myri10ge_close(dev);
3039 		dev->mtu = new_mtu;
3040 		myri10ge_open(dev);
3041 	} else
3042 		dev->mtu = new_mtu;
3043 
3044 	return 0;
3045 }
3046 
3047 /*
3048  * Enable ECRC to align PCI-E Completion packets on an 8-byte boundary.
3049  * Only do it if the bridge is a root port since we don't want to disturb
3050  * any other device, except if forced with myri10ge_ecrc_enable > 1.
3051  */
3052 
3053 static void myri10ge_enable_ecrc(struct myri10ge_priv *mgp)
3054 {
3055 	struct pci_dev *bridge = mgp->pdev->bus->self;
3056 	struct device *dev = &mgp->pdev->dev;
3057 	int cap;
3058 	unsigned err_cap;
3059 	int ret;
3060 
3061 	if (!myri10ge_ecrc_enable || !bridge)
3062 		return;
3063 
3064 	/* check that the bridge is a root port */
3065 	if (pci_pcie_type(bridge) != PCI_EXP_TYPE_ROOT_PORT) {
3066 		if (myri10ge_ecrc_enable > 1) {
3067 			struct pci_dev *prev_bridge, *old_bridge = bridge;
3068 
3069 			/* Walk the hierarchy up to the root port
3070 			 * where ECRC has to be enabled */
3071 			do {
3072 				prev_bridge = bridge;
3073 				bridge = bridge->bus->self;
3074 				if (!bridge || prev_bridge == bridge) {
3075 					dev_err(dev,
3076 						"Failed to find root port"
3077 						" to force ECRC\n");
3078 					return;
3079 				}
3080 			} while (pci_pcie_type(bridge) !=
3081 				 PCI_EXP_TYPE_ROOT_PORT);
3082 
3083 			dev_info(dev,
3084 				 "Forcing ECRC on non-root port %s"
3085 				 " (enabling on root port %s)\n",
3086 				 pci_name(old_bridge), pci_name(bridge));
3087 		} else {
3088 			dev_err(dev,
3089 				"Not enabling ECRC on non-root port %s\n",
3090 				pci_name(bridge));
3091 			return;
3092 		}
3093 	}
3094 
3095 	cap = pci_find_ext_capability(bridge, PCI_EXT_CAP_ID_ERR);
3096 	if (!cap)
3097 		return;
3098 
3099 	ret = pci_read_config_dword(bridge, cap + PCI_ERR_CAP, &err_cap);
3100 	if (ret) {
3101 		dev_err(dev, "failed reading ext-conf-space of %s\n",
3102 			pci_name(bridge));
3103 		dev_err(dev, "\t pci=nommconf in use? "
3104 			"or buggy/incomplete/absent ACPI MCFG attr?\n");
3105 		return;
3106 	}
3107 	if (!(err_cap & PCI_ERR_CAP_ECRC_GENC))
3108 		return;
3109 
3110 	err_cap |= PCI_ERR_CAP_ECRC_GENE;
3111 	pci_write_config_dword(bridge, cap + PCI_ERR_CAP, err_cap);
3112 	dev_info(dev, "Enabled ECRC on upstream bridge %s\n", pci_name(bridge));
3113 }
3114 
3115 /*
3116  * The Lanai Z8E PCI-E interface achieves higher Read-DMA throughput
3117  * when the PCI-E Completion packets are aligned on an 8-byte
3118  * boundary.  Some PCI-E chip sets always align Completion packets; on
3119  * the ones that do not, the alignment can be enforced by enabling
3120  * ECRC generation (if supported).
3121  *
3122  * When PCI-E Completion packets are not aligned, it is actually more
3123  * efficient to limit Read-DMA transactions to 2KB, rather than 4KB.
3124  *
3125  * If the driver can neither enable ECRC nor verify that it has
3126  * already been enabled, then it must use a firmware image which works
3127  * around unaligned completion packets (myri10ge_rss_ethp_z8e.dat), and it
3128  * should also ensure that it never gives the device a Read-DMA which is
3129  * larger than 2KB by setting the tx_boundary to 2KB.  If ECRC is
3130  * enabled, then the driver should use the aligned (myri10ge_rss_eth_z8e.dat)
3131  * firmware image, and set tx_boundary to 4KB.
3132  */
3133 
3134 static void myri10ge_firmware_probe(struct myri10ge_priv *mgp)
3135 {
3136 	struct pci_dev *pdev = mgp->pdev;
3137 	struct device *dev = &pdev->dev;
3138 	int status;
3139 
3140 	mgp->tx_boundary = 4096;
3141 	/*
3142 	 * Verify the max read request size was set to 4KB
3143 	 * before trying the test with 4KB.
3144 	 */
3145 	status = pcie_get_readrq(pdev);
3146 	if (status < 0) {
3147 		dev_err(dev, "Couldn't read max read req size: %d\n", status);
3148 		goto abort;
3149 	}
3150 	if (status != 4096) {
3151 		dev_warn(dev, "Max Read Request size != 4096 (%d)\n", status);
3152 		mgp->tx_boundary = 2048;
3153 	}
3154 	/*
3155 	 * load the optimized firmware (which assumes aligned PCIe
3156 	 * completions) in order to see if it works on this host.
3157 	 */
3158 	set_fw_name(mgp, myri10ge_fw_aligned, false);
3159 	status = myri10ge_load_firmware(mgp, 1);
3160 	if (status != 0) {
3161 		goto abort;
3162 	}
3163 
3164 	/*
3165 	 * Enable ECRC if possible
3166 	 */
3167 	myri10ge_enable_ecrc(mgp);
3168 
3169 	/*
3170 	 * Run a DMA test which watches for unaligned completions and
3171 	 * aborts on the first one seen.
3172 	 */
3173 
3174 	status = myri10ge_dma_test(mgp, MXGEFW_CMD_UNALIGNED_TEST);
3175 	if (status == 0)
3176 		return;		/* keep the aligned firmware */
3177 
3178 	if (status != -E2BIG)
3179 		dev_warn(dev, "DMA test failed: %d\n", status);
3180 	if (status == -ENOSYS)
3181 		dev_warn(dev, "Falling back to ethp! "
3182 			 "Please install up to date fw\n");
3183 abort:
3184 	/* fall back to using the unaligned firmware */
3185 	mgp->tx_boundary = 2048;
3186 	set_fw_name(mgp, myri10ge_fw_unaligned, false);
3187 }
3188 
3189 static void myri10ge_select_firmware(struct myri10ge_priv *mgp)
3190 {
3191 	int overridden = 0;
3192 
3193 	if (myri10ge_force_firmware == 0) {
3194 		int link_width;
3195 		u16 lnk;
3196 
3197 		pcie_capability_read_word(mgp->pdev, PCI_EXP_LNKSTA, &lnk);
3198 		link_width = (lnk >> 4) & 0x3f;
3199 
3200 		/* Check to see if Link is less than 8 or if the
3201 		 * upstream bridge is known to provide aligned
3202 		 * completions */
3203 		if (link_width < 8) {
3204 			dev_info(&mgp->pdev->dev, "PCIE x%d Link\n",
3205 				 link_width);
3206 			mgp->tx_boundary = 4096;
3207 			set_fw_name(mgp, myri10ge_fw_aligned, false);
3208 		} else {
3209 			myri10ge_firmware_probe(mgp);
3210 		}
3211 	} else {
3212 		if (myri10ge_force_firmware == 1) {
3213 			dev_info(&mgp->pdev->dev,
3214 				 "Assuming aligned completions (forced)\n");
3215 			mgp->tx_boundary = 4096;
3216 			set_fw_name(mgp, myri10ge_fw_aligned, false);
3217 		} else {
3218 			dev_info(&mgp->pdev->dev,
3219 				 "Assuming unaligned completions (forced)\n");
3220 			mgp->tx_boundary = 2048;
3221 			set_fw_name(mgp, myri10ge_fw_unaligned, false);
3222 		}
3223 	}
3224 
3225 	kernel_param_lock(THIS_MODULE);
3226 	if (myri10ge_fw_name != NULL) {
3227 		char *fw_name = kstrdup(myri10ge_fw_name, GFP_KERNEL);
3228 		if (fw_name) {
3229 			overridden = 1;
3230 			set_fw_name(mgp, fw_name, true);
3231 		}
3232 	}
3233 	kernel_param_unlock(THIS_MODULE);
3234 
3235 	if (mgp->board_number < MYRI10GE_MAX_BOARDS &&
3236 	    myri10ge_fw_names[mgp->board_number] != NULL &&
3237 	    strlen(myri10ge_fw_names[mgp->board_number])) {
3238 		set_fw_name(mgp, myri10ge_fw_names[mgp->board_number], false);
3239 		overridden = 1;
3240 	}
3241 	if (overridden)
3242 		dev_info(&mgp->pdev->dev, "overriding firmware to %s\n",
3243 			 mgp->fw_name);
3244 }
3245 
3246 static void myri10ge_mask_surprise_down(struct pci_dev *pdev)
3247 {
3248 	struct pci_dev *bridge = pdev->bus->self;
3249 	int cap;
3250 	u32 mask;
3251 
3252 	if (bridge == NULL)
3253 		return;
3254 
3255 	cap = pci_find_ext_capability(bridge, PCI_EXT_CAP_ID_ERR);
3256 	if (cap) {
3257 		/* a sram parity error can cause a surprise link
3258 		 * down; since we expect and can recover from sram
3259 		 * parity errors, mask surprise link down events */
3260 		pci_read_config_dword(bridge, cap + PCI_ERR_UNCOR_MASK, &mask);
3261 		mask |= 0x20;
3262 		pci_write_config_dword(bridge, cap + PCI_ERR_UNCOR_MASK, mask);
3263 	}
3264 }
3265 
3266 static int __maybe_unused myri10ge_suspend(struct device *dev)
3267 {
3268 	struct myri10ge_priv *mgp;
3269 	struct net_device *netdev;
3270 
3271 	mgp = dev_get_drvdata(dev);
3272 	if (mgp == NULL)
3273 		return -EINVAL;
3274 	netdev = mgp->dev;
3275 
3276 	netif_device_detach(netdev);
3277 	if (netif_running(netdev)) {
3278 		netdev_info(netdev, "closing\n");
3279 		rtnl_lock();
3280 		myri10ge_close(netdev);
3281 		rtnl_unlock();
3282 	}
3283 	myri10ge_dummy_rdma(mgp, 0);
3284 
3285 	return 0;
3286 }
3287 
3288 static int __maybe_unused myri10ge_resume(struct device *dev)
3289 {
3290 	struct pci_dev *pdev = to_pci_dev(dev);
3291 	struct myri10ge_priv *mgp;
3292 	struct net_device *netdev;
3293 	int status;
3294 	u16 vendor;
3295 
3296 	mgp = pci_get_drvdata(pdev);
3297 	if (mgp == NULL)
3298 		return -EINVAL;
3299 	netdev = mgp->dev;
3300 	msleep(5);		/* give card time to respond */
3301 	pci_read_config_word(mgp->pdev, PCI_VENDOR_ID, &vendor);
3302 	if (vendor == 0xffff) {
3303 		netdev_err(mgp->dev, "device disappeared!\n");
3304 		return -EIO;
3305 	}
3306 
3307 	myri10ge_reset(mgp);
3308 	myri10ge_dummy_rdma(mgp, 1);
3309 
3310 	if (netif_running(netdev)) {
3311 		rtnl_lock();
3312 		status = myri10ge_open(netdev);
3313 		rtnl_unlock();
3314 		if (status != 0)
3315 			goto abort_with_enabled;
3316 
3317 	}
3318 	netif_device_attach(netdev);
3319 
3320 	return 0;
3321 
3322 abort_with_enabled:
3323 	return -EIO;
3324 }
3325 
3326 static u32 myri10ge_read_reboot(struct myri10ge_priv *mgp)
3327 {
3328 	struct pci_dev *pdev = mgp->pdev;
3329 	int vs = mgp->vendor_specific_offset;
3330 	u32 reboot;
3331 
3332 	/*enter read32 mode */
3333 	pci_write_config_byte(pdev, vs + 0x10, 0x3);
3334 
3335 	/*read REBOOT_STATUS (0xfffffff0) */
3336 	pci_write_config_dword(pdev, vs + 0x18, 0xfffffff0);
3337 	pci_read_config_dword(pdev, vs + 0x14, &reboot);
3338 	return reboot;
3339 }
3340 
3341 static void
3342 myri10ge_check_slice(struct myri10ge_slice_state *ss, int *reset_needed,
3343 		     int *busy_slice_cnt, u32 rx_pause_cnt)
3344 {
3345 	struct myri10ge_priv *mgp = ss->mgp;
3346 	int slice = ss - mgp->ss;
3347 
3348 	if (ss->tx.req != ss->tx.done &&
3349 	    ss->tx.done == ss->watchdog_tx_done &&
3350 	    ss->watchdog_tx_req != ss->watchdog_tx_done) {
3351 		/* nic seems like it might be stuck.. */
3352 		if (rx_pause_cnt != mgp->watchdog_pause) {
3353 			if (net_ratelimit())
3354 				netdev_warn(mgp->dev, "slice %d: TX paused, "
3355 					    "check link partner\n", slice);
3356 		} else {
3357 			netdev_warn(mgp->dev,
3358 				    "slice %d: TX stuck %d %d %d %d %d %d\n",
3359 				    slice, ss->tx.queue_active, ss->tx.req,
3360 				    ss->tx.done, ss->tx.pkt_start,
3361 				    ss->tx.pkt_done,
3362 				    (int)ntohl(mgp->ss[slice].fw_stats->
3363 					       send_done_count));
3364 			*reset_needed = 1;
3365 			ss->stuck = 1;
3366 		}
3367 	}
3368 	if (ss->watchdog_tx_done != ss->tx.done ||
3369 	    ss->watchdog_rx_done != ss->rx_done.cnt) {
3370 		*busy_slice_cnt += 1;
3371 	}
3372 	ss->watchdog_tx_done = ss->tx.done;
3373 	ss->watchdog_tx_req = ss->tx.req;
3374 	ss->watchdog_rx_done = ss->rx_done.cnt;
3375 }
3376 
3377 /*
3378  * This watchdog is used to check whether the board has suffered
3379  * from a parity error and needs to be recovered.
3380  */
3381 static void myri10ge_watchdog(struct work_struct *work)
3382 {
3383 	struct myri10ge_priv *mgp =
3384 	    container_of(work, struct myri10ge_priv, watchdog_work);
3385 	struct myri10ge_slice_state *ss;
3386 	u32 reboot, rx_pause_cnt;
3387 	int status, rebooted;
3388 	int i;
3389 	int reset_needed = 0;
3390 	int busy_slice_cnt = 0;
3391 	u16 cmd, vendor;
3392 
3393 	mgp->watchdog_resets++;
3394 	pci_read_config_word(mgp->pdev, PCI_COMMAND, &cmd);
3395 	rebooted = 0;
3396 	if ((cmd & PCI_COMMAND_MASTER) == 0) {
3397 		/* Bus master DMA disabled?  Check to see
3398 		 * if the card rebooted due to a parity error
3399 		 * For now, just report it */
3400 		reboot = myri10ge_read_reboot(mgp);
3401 		netdev_err(mgp->dev, "NIC rebooted (0x%x),%s resetting\n",
3402 			   reboot, myri10ge_reset_recover ? "" : " not");
3403 		if (myri10ge_reset_recover == 0)
3404 			return;
3405 		rtnl_lock();
3406 		mgp->rebooted = 1;
3407 		rebooted = 1;
3408 		myri10ge_close(mgp->dev);
3409 		myri10ge_reset_recover--;
3410 		mgp->rebooted = 0;
3411 		/*
3412 		 * A rebooted nic will come back with config space as
3413 		 * it was after power was applied to PCIe bus.
3414 		 * Attempt to restore config space which was saved
3415 		 * when the driver was loaded, or the last time the
3416 		 * nic was resumed from power saving mode.
3417 		 */
3418 		pci_restore_state(mgp->pdev);
3419 
3420 		/* save state again for accounting reasons */
3421 		pci_save_state(mgp->pdev);
3422 
3423 	} else {
3424 		/* if we get back -1's from our slot, perhaps somebody
3425 		 * powered off our card.  Don't try to reset it in
3426 		 * this case */
3427 		if (cmd == 0xffff) {
3428 			pci_read_config_word(mgp->pdev, PCI_VENDOR_ID, &vendor);
3429 			if (vendor == 0xffff) {
3430 				netdev_err(mgp->dev, "device disappeared!\n");
3431 				return;
3432 			}
3433 		}
3434 		/* Perhaps it is a software error. See if stuck slice
3435 		 * has recovered, reset if not */
3436 		rx_pause_cnt = ntohl(mgp->ss[0].fw_stats->dropped_pause);
3437 		for (i = 0; i < mgp->num_slices; i++) {
3438 			ss = mgp->ss;
3439 			if (ss->stuck) {
3440 				myri10ge_check_slice(ss, &reset_needed,
3441 						     &busy_slice_cnt,
3442 						     rx_pause_cnt);
3443 				ss->stuck = 0;
3444 			}
3445 		}
3446 		if (!reset_needed) {
3447 			netdev_dbg(mgp->dev, "not resetting\n");
3448 			return;
3449 		}
3450 
3451 		netdev_err(mgp->dev, "device timeout, resetting\n");
3452 	}
3453 
3454 	if (!rebooted) {
3455 		rtnl_lock();
3456 		myri10ge_close(mgp->dev);
3457 	}
3458 	status = myri10ge_load_firmware(mgp, 1);
3459 	if (status != 0)
3460 		netdev_err(mgp->dev, "failed to load firmware\n");
3461 	else
3462 		myri10ge_open(mgp->dev);
3463 	rtnl_unlock();
3464 }
3465 
3466 /*
3467  * We use our own timer routine rather than relying upon
3468  * netdev->tx_timeout because we have a very large hardware transmit
3469  * queue.  Due to the large queue, the netdev->tx_timeout function
3470  * cannot detect a NIC with a parity error in a timely fashion if the
3471  * NIC is lightly loaded.
3472  */
3473 static void myri10ge_watchdog_timer(struct timer_list *t)
3474 {
3475 	struct myri10ge_priv *mgp;
3476 	struct myri10ge_slice_state *ss;
3477 	int i, reset_needed, busy_slice_cnt;
3478 	u32 rx_pause_cnt;
3479 	u16 cmd;
3480 
3481 	mgp = from_timer(mgp, t, watchdog_timer);
3482 
3483 	rx_pause_cnt = ntohl(mgp->ss[0].fw_stats->dropped_pause);
3484 	busy_slice_cnt = 0;
3485 	for (i = 0, reset_needed = 0;
3486 	     i < mgp->num_slices && reset_needed == 0; ++i) {
3487 
3488 		ss = &mgp->ss[i];
3489 		if (ss->rx_small.watchdog_needed) {
3490 			myri10ge_alloc_rx_pages(mgp, &ss->rx_small,
3491 						mgp->small_bytes + MXGEFW_PAD,
3492 						1);
3493 			if (ss->rx_small.fill_cnt - ss->rx_small.cnt >=
3494 			    myri10ge_fill_thresh)
3495 				ss->rx_small.watchdog_needed = 0;
3496 		}
3497 		if (ss->rx_big.watchdog_needed) {
3498 			myri10ge_alloc_rx_pages(mgp, &ss->rx_big,
3499 						mgp->big_bytes, 1);
3500 			if (ss->rx_big.fill_cnt - ss->rx_big.cnt >=
3501 			    myri10ge_fill_thresh)
3502 				ss->rx_big.watchdog_needed = 0;
3503 		}
3504 		myri10ge_check_slice(ss, &reset_needed, &busy_slice_cnt,
3505 				     rx_pause_cnt);
3506 	}
3507 	/* if we've sent or received no traffic, poll the NIC to
3508 	 * ensure it is still there.  Otherwise, we risk not noticing
3509 	 * an error in a timely fashion */
3510 	if (busy_slice_cnt == 0) {
3511 		pci_read_config_word(mgp->pdev, PCI_COMMAND, &cmd);
3512 		if ((cmd & PCI_COMMAND_MASTER) == 0) {
3513 			reset_needed = 1;
3514 		}
3515 	}
3516 	mgp->watchdog_pause = rx_pause_cnt;
3517 
3518 	if (reset_needed) {
3519 		schedule_work(&mgp->watchdog_work);
3520 	} else {
3521 		/* rearm timer */
3522 		mod_timer(&mgp->watchdog_timer,
3523 			  jiffies + myri10ge_watchdog_timeout * HZ);
3524 	}
3525 }
3526 
3527 static void myri10ge_free_slices(struct myri10ge_priv *mgp)
3528 {
3529 	struct myri10ge_slice_state *ss;
3530 	struct pci_dev *pdev = mgp->pdev;
3531 	size_t bytes;
3532 	int i;
3533 
3534 	if (mgp->ss == NULL)
3535 		return;
3536 
3537 	for (i = 0; i < mgp->num_slices; i++) {
3538 		ss = &mgp->ss[i];
3539 		if (ss->rx_done.entry != NULL) {
3540 			bytes = mgp->max_intr_slots *
3541 			    sizeof(*ss->rx_done.entry);
3542 			dma_free_coherent(&pdev->dev, bytes,
3543 					  ss->rx_done.entry, ss->rx_done.bus);
3544 			ss->rx_done.entry = NULL;
3545 		}
3546 		if (ss->fw_stats != NULL) {
3547 			bytes = sizeof(*ss->fw_stats);
3548 			dma_free_coherent(&pdev->dev, bytes,
3549 					  ss->fw_stats, ss->fw_stats_bus);
3550 			ss->fw_stats = NULL;
3551 		}
3552 		__netif_napi_del(&ss->napi);
3553 	}
3554 	/* Wait till napi structs are no longer used, and then free ss. */
3555 	synchronize_net();
3556 	kfree(mgp->ss);
3557 	mgp->ss = NULL;
3558 }
3559 
3560 static int myri10ge_alloc_slices(struct myri10ge_priv *mgp)
3561 {
3562 	struct myri10ge_slice_state *ss;
3563 	struct pci_dev *pdev = mgp->pdev;
3564 	size_t bytes;
3565 	int i;
3566 
3567 	bytes = sizeof(*mgp->ss) * mgp->num_slices;
3568 	mgp->ss = kzalloc(bytes, GFP_KERNEL);
3569 	if (mgp->ss == NULL) {
3570 		return -ENOMEM;
3571 	}
3572 
3573 	for (i = 0; i < mgp->num_slices; i++) {
3574 		ss = &mgp->ss[i];
3575 		bytes = mgp->max_intr_slots * sizeof(*ss->rx_done.entry);
3576 		ss->rx_done.entry = dma_alloc_coherent(&pdev->dev, bytes,
3577 						       &ss->rx_done.bus,
3578 						       GFP_KERNEL);
3579 		if (ss->rx_done.entry == NULL)
3580 			goto abort;
3581 		bytes = sizeof(*ss->fw_stats);
3582 		ss->fw_stats = dma_alloc_coherent(&pdev->dev, bytes,
3583 						  &ss->fw_stats_bus,
3584 						  GFP_KERNEL);
3585 		if (ss->fw_stats == NULL)
3586 			goto abort;
3587 		ss->mgp = mgp;
3588 		ss->dev = mgp->dev;
3589 		netif_napi_add_weight(ss->dev, &ss->napi, myri10ge_poll,
3590 				      myri10ge_napi_weight);
3591 	}
3592 	return 0;
3593 abort:
3594 	myri10ge_free_slices(mgp);
3595 	return -ENOMEM;
3596 }
3597 
3598 /*
3599  * This function determines the number of slices supported.
3600  * The number slices is the minimum of the number of CPUS,
3601  * the number of MSI-X irqs supported, the number of slices
3602  * supported by the firmware
3603  */
3604 static void myri10ge_probe_slices(struct myri10ge_priv *mgp)
3605 {
3606 	struct myri10ge_cmd cmd;
3607 	struct pci_dev *pdev = mgp->pdev;
3608 	char *old_fw;
3609 	bool old_allocated;
3610 	int i, status, ncpus;
3611 
3612 	mgp->num_slices = 1;
3613 	ncpus = netif_get_num_default_rss_queues();
3614 
3615 	if (myri10ge_max_slices == 1 || !pdev->msix_cap ||
3616 	    (myri10ge_max_slices == -1 && ncpus < 2))
3617 		return;
3618 
3619 	/* try to load the slice aware rss firmware */
3620 	old_fw = mgp->fw_name;
3621 	old_allocated = mgp->fw_name_allocated;
3622 	/* don't free old_fw if we override it. */
3623 	mgp->fw_name_allocated = false;
3624 
3625 	if (myri10ge_fw_name != NULL) {
3626 		dev_info(&mgp->pdev->dev, "overriding rss firmware to %s\n",
3627 			 myri10ge_fw_name);
3628 		set_fw_name(mgp, myri10ge_fw_name, false);
3629 	} else if (old_fw == myri10ge_fw_aligned)
3630 		set_fw_name(mgp, myri10ge_fw_rss_aligned, false);
3631 	else
3632 		set_fw_name(mgp, myri10ge_fw_rss_unaligned, false);
3633 	status = myri10ge_load_firmware(mgp, 0);
3634 	if (status != 0) {
3635 		dev_info(&pdev->dev, "Rss firmware not found\n");
3636 		if (old_allocated)
3637 			kfree(old_fw);
3638 		return;
3639 	}
3640 
3641 	/* hit the board with a reset to ensure it is alive */
3642 	memset(&cmd, 0, sizeof(cmd));
3643 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_RESET, &cmd, 0);
3644 	if (status != 0) {
3645 		dev_err(&mgp->pdev->dev, "failed reset\n");
3646 		goto abort_with_fw;
3647 	}
3648 
3649 	mgp->max_intr_slots = cmd.data0 / sizeof(struct mcp_slot);
3650 
3651 	/* tell it the size of the interrupt queues */
3652 	cmd.data0 = mgp->max_intr_slots * sizeof(struct mcp_slot);
3653 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_INTRQ_SIZE, &cmd, 0);
3654 	if (status != 0) {
3655 		dev_err(&mgp->pdev->dev, "failed MXGEFW_CMD_SET_INTRQ_SIZE\n");
3656 		goto abort_with_fw;
3657 	}
3658 
3659 	/* ask the maximum number of slices it supports */
3660 	status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_MAX_RSS_QUEUES, &cmd, 0);
3661 	if (status != 0)
3662 		goto abort_with_fw;
3663 	else
3664 		mgp->num_slices = cmd.data0;
3665 
3666 	/* Only allow multiple slices if MSI-X is usable */
3667 	if (!myri10ge_msi) {
3668 		goto abort_with_fw;
3669 	}
3670 
3671 	/* if the admin did not specify a limit to how many
3672 	 * slices we should use, cap it automatically to the
3673 	 * number of CPUs currently online */
3674 	if (myri10ge_max_slices == -1)
3675 		myri10ge_max_slices = ncpus;
3676 
3677 	if (mgp->num_slices > myri10ge_max_slices)
3678 		mgp->num_slices = myri10ge_max_slices;
3679 
3680 	/* Now try to allocate as many MSI-X vectors as we have
3681 	 * slices. We give up on MSI-X if we can only get a single
3682 	 * vector. */
3683 
3684 	mgp->msix_vectors = kcalloc(mgp->num_slices, sizeof(*mgp->msix_vectors),
3685 				    GFP_KERNEL);
3686 	if (mgp->msix_vectors == NULL)
3687 		goto no_msix;
3688 	for (i = 0; i < mgp->num_slices; i++) {
3689 		mgp->msix_vectors[i].entry = i;
3690 	}
3691 
3692 	while (mgp->num_slices > 1) {
3693 		mgp->num_slices = rounddown_pow_of_two(mgp->num_slices);
3694 		if (mgp->num_slices == 1)
3695 			goto no_msix;
3696 		status = pci_enable_msix_range(pdev,
3697 					       mgp->msix_vectors,
3698 					       mgp->num_slices,
3699 					       mgp->num_slices);
3700 		if (status < 0)
3701 			goto no_msix;
3702 
3703 		pci_disable_msix(pdev);
3704 
3705 		if (status == mgp->num_slices) {
3706 			if (old_allocated)
3707 				kfree(old_fw);
3708 			return;
3709 		} else {
3710 			mgp->num_slices = status;
3711 		}
3712 	}
3713 
3714 no_msix:
3715 	if (mgp->msix_vectors != NULL) {
3716 		kfree(mgp->msix_vectors);
3717 		mgp->msix_vectors = NULL;
3718 	}
3719 
3720 abort_with_fw:
3721 	mgp->num_slices = 1;
3722 	set_fw_name(mgp, old_fw, old_allocated);
3723 	myri10ge_load_firmware(mgp, 0);
3724 }
3725 
3726 static const struct net_device_ops myri10ge_netdev_ops = {
3727 	.ndo_open		= myri10ge_open,
3728 	.ndo_stop		= myri10ge_close,
3729 	.ndo_start_xmit		= myri10ge_xmit,
3730 	.ndo_get_stats64	= myri10ge_get_stats,
3731 	.ndo_validate_addr	= eth_validate_addr,
3732 	.ndo_change_mtu		= myri10ge_change_mtu,
3733 	.ndo_set_rx_mode	= myri10ge_set_multicast_list,
3734 	.ndo_set_mac_address	= myri10ge_set_mac_address,
3735 };
3736 
3737 static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
3738 {
3739 	struct net_device *netdev;
3740 	struct myri10ge_priv *mgp;
3741 	struct device *dev = &pdev->dev;
3742 	int status = -ENXIO;
3743 	unsigned hdr_offset, ss_offset;
3744 	static int board_number;
3745 
3746 	netdev = alloc_etherdev_mq(sizeof(*mgp), MYRI10GE_MAX_SLICES);
3747 	if (netdev == NULL)
3748 		return -ENOMEM;
3749 
3750 	SET_NETDEV_DEV(netdev, &pdev->dev);
3751 
3752 	mgp = netdev_priv(netdev);
3753 	mgp->dev = netdev;
3754 	mgp->pdev = pdev;
3755 	mgp->pause = myri10ge_flow_control;
3756 	mgp->intr_coal_delay = myri10ge_intr_coal_delay;
3757 	mgp->msg_enable = netif_msg_init(myri10ge_debug, MYRI10GE_MSG_DEFAULT);
3758 	mgp->board_number = board_number;
3759 	init_waitqueue_head(&mgp->down_wq);
3760 
3761 	if (pci_enable_device(pdev)) {
3762 		dev_err(&pdev->dev, "pci_enable_device call failed\n");
3763 		status = -ENODEV;
3764 		goto abort_with_netdev;
3765 	}
3766 
3767 	/* Find the vendor-specific cap so we can check
3768 	 * the reboot register later on */
3769 	mgp->vendor_specific_offset
3770 	    = pci_find_capability(pdev, PCI_CAP_ID_VNDR);
3771 
3772 	/* Set our max read request to 4KB */
3773 	status = pcie_set_readrq(pdev, 4096);
3774 	if (status != 0) {
3775 		dev_err(&pdev->dev, "Error %d writing PCI_EXP_DEVCTL\n",
3776 			status);
3777 		goto abort_with_enabled;
3778 	}
3779 
3780 	myri10ge_mask_surprise_down(pdev);
3781 	pci_set_master(pdev);
3782 	status = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
3783 	if (status != 0) {
3784 		dev_err(&pdev->dev, "Error %d setting DMA mask\n", status);
3785 		goto abort_with_enabled;
3786 	}
3787 	mgp->cmd = dma_alloc_coherent(&pdev->dev, sizeof(*mgp->cmd),
3788 				      &mgp->cmd_bus, GFP_KERNEL);
3789 	if (!mgp->cmd) {
3790 		status = -ENOMEM;
3791 		goto abort_with_enabled;
3792 	}
3793 
3794 	mgp->board_span = pci_resource_len(pdev, 0);
3795 	mgp->iomem_base = pci_resource_start(pdev, 0);
3796 	mgp->wc_cookie = arch_phys_wc_add(mgp->iomem_base, mgp->board_span);
3797 	mgp->sram = ioremap_wc(mgp->iomem_base, mgp->board_span);
3798 	if (mgp->sram == NULL) {
3799 		dev_err(&pdev->dev, "ioremap failed for %ld bytes at 0x%lx\n",
3800 			mgp->board_span, mgp->iomem_base);
3801 		status = -ENXIO;
3802 		goto abort_with_mtrr;
3803 	}
3804 	hdr_offset =
3805 	    swab32(readl(mgp->sram + MCP_HEADER_PTR_OFFSET)) & 0xffffc;
3806 	ss_offset = hdr_offset + offsetof(struct mcp_gen_header, string_specs);
3807 	mgp->sram_size = swab32(readl(mgp->sram + ss_offset));
3808 	if (mgp->sram_size > mgp->board_span ||
3809 	    mgp->sram_size <= MYRI10GE_FW_OFFSET) {
3810 		dev_err(&pdev->dev,
3811 			"invalid sram_size %dB or board span %ldB\n",
3812 			mgp->sram_size, mgp->board_span);
3813 		status = -EINVAL;
3814 		goto abort_with_ioremap;
3815 	}
3816 	memcpy_fromio(mgp->eeprom_strings,
3817 		      mgp->sram + mgp->sram_size, MYRI10GE_EEPROM_STRINGS_SIZE);
3818 	memset(mgp->eeprom_strings + MYRI10GE_EEPROM_STRINGS_SIZE - 2, 0, 2);
3819 	status = myri10ge_read_mac_addr(mgp);
3820 	if (status)
3821 		goto abort_with_ioremap;
3822 
3823 	eth_hw_addr_set(netdev, mgp->mac_addr);
3824 
3825 	myri10ge_select_firmware(mgp);
3826 
3827 	status = myri10ge_load_firmware(mgp, 1);
3828 	if (status != 0) {
3829 		dev_err(&pdev->dev, "failed to load firmware\n");
3830 		goto abort_with_ioremap;
3831 	}
3832 	myri10ge_probe_slices(mgp);
3833 	status = myri10ge_alloc_slices(mgp);
3834 	if (status != 0) {
3835 		dev_err(&pdev->dev, "failed to alloc slice state\n");
3836 		goto abort_with_firmware;
3837 	}
3838 	netif_set_real_num_tx_queues(netdev, mgp->num_slices);
3839 	netif_set_real_num_rx_queues(netdev, mgp->num_slices);
3840 	status = myri10ge_reset(mgp);
3841 	if (status != 0) {
3842 		dev_err(&pdev->dev, "failed reset\n");
3843 		goto abort_with_slices;
3844 	}
3845 #ifdef CONFIG_MYRI10GE_DCA
3846 	myri10ge_setup_dca(mgp);
3847 #endif
3848 	pci_set_drvdata(pdev, mgp);
3849 
3850 	/* MTU range: 68 - 9000 */
3851 	netdev->min_mtu = ETH_MIN_MTU;
3852 	netdev->max_mtu = MYRI10GE_MAX_ETHER_MTU - ETH_HLEN;
3853 
3854 	if (myri10ge_initial_mtu > netdev->max_mtu)
3855 		myri10ge_initial_mtu = netdev->max_mtu;
3856 	if (myri10ge_initial_mtu < netdev->min_mtu)
3857 		myri10ge_initial_mtu = netdev->min_mtu;
3858 
3859 	netdev->mtu = myri10ge_initial_mtu;
3860 
3861 	netdev->netdev_ops = &myri10ge_netdev_ops;
3862 	netdev->hw_features = mgp->features | NETIF_F_RXCSUM;
3863 
3864 	/* fake NETIF_F_HW_VLAN_CTAG_RX for good GRO performance */
3865 	netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX;
3866 
3867 	netdev->features = netdev->hw_features | NETIF_F_HIGHDMA;
3868 
3869 	netdev->vlan_features |= mgp->features;
3870 	if (mgp->fw_ver_tiny < 37)
3871 		netdev->vlan_features &= ~NETIF_F_TSO6;
3872 	if (mgp->fw_ver_tiny < 32)
3873 		netdev->vlan_features &= ~NETIF_F_TSO;
3874 
3875 	/* make sure we can get an irq, and that MSI can be
3876 	 * setup (if available). */
3877 	status = myri10ge_request_irq(mgp);
3878 	if (status != 0)
3879 		goto abort_with_slices;
3880 	myri10ge_free_irq(mgp);
3881 
3882 	/* Save configuration space to be restored if the
3883 	 * nic resets due to a parity error */
3884 	pci_save_state(pdev);
3885 
3886 	/* Setup the watchdog timer */
3887 	timer_setup(&mgp->watchdog_timer, myri10ge_watchdog_timer, 0);
3888 
3889 	netdev->ethtool_ops = &myri10ge_ethtool_ops;
3890 	INIT_WORK(&mgp->watchdog_work, myri10ge_watchdog);
3891 	status = register_netdev(netdev);
3892 	if (status != 0) {
3893 		dev_err(&pdev->dev, "register_netdev failed: %d\n", status);
3894 		goto abort_with_state;
3895 	}
3896 	if (mgp->msix_enabled)
3897 		dev_info(dev, "%d MSI-X IRQs, tx bndry %d, fw %s, MTRR %s, WC Enabled\n",
3898 			 mgp->num_slices, mgp->tx_boundary, mgp->fw_name,
3899 			 (mgp->wc_cookie > 0 ? "Enabled" : "Disabled"));
3900 	else
3901 		dev_info(dev, "%s IRQ %d, tx bndry %d, fw %s, MTRR %s, WC Enabled\n",
3902 			 mgp->msi_enabled ? "MSI" : "xPIC",
3903 			 pdev->irq, mgp->tx_boundary, mgp->fw_name,
3904 			 (mgp->wc_cookie > 0 ? "Enabled" : "Disabled"));
3905 
3906 	board_number++;
3907 	return 0;
3908 
3909 abort_with_state:
3910 	pci_restore_state(pdev);
3911 
3912 abort_with_slices:
3913 	myri10ge_free_slices(mgp);
3914 
3915 abort_with_firmware:
3916 	myri10ge_dummy_rdma(mgp, 0);
3917 
3918 abort_with_ioremap:
3919 	if (mgp->mac_addr_string != NULL)
3920 		dev_err(&pdev->dev,
3921 			"myri10ge_probe() failed: MAC=%s, SN=%ld\n",
3922 			mgp->mac_addr_string, mgp->serial_number);
3923 	iounmap(mgp->sram);
3924 
3925 abort_with_mtrr:
3926 	arch_phys_wc_del(mgp->wc_cookie);
3927 	dma_free_coherent(&pdev->dev, sizeof(*mgp->cmd),
3928 			  mgp->cmd, mgp->cmd_bus);
3929 
3930 abort_with_enabled:
3931 	pci_disable_device(pdev);
3932 
3933 abort_with_netdev:
3934 	set_fw_name(mgp, NULL, false);
3935 	free_netdev(netdev);
3936 	return status;
3937 }
3938 
3939 /*
3940  * myri10ge_remove
3941  *
3942  * Does what is necessary to shutdown one Myrinet device. Called
3943  *   once for each Myrinet card by the kernel when a module is
3944  *   unloaded.
3945  */
3946 static void myri10ge_remove(struct pci_dev *pdev)
3947 {
3948 	struct myri10ge_priv *mgp;
3949 	struct net_device *netdev;
3950 
3951 	mgp = pci_get_drvdata(pdev);
3952 	if (mgp == NULL)
3953 		return;
3954 
3955 	cancel_work_sync(&mgp->watchdog_work);
3956 	netdev = mgp->dev;
3957 	unregister_netdev(netdev);
3958 
3959 #ifdef CONFIG_MYRI10GE_DCA
3960 	myri10ge_teardown_dca(mgp);
3961 #endif
3962 	myri10ge_dummy_rdma(mgp, 0);
3963 
3964 	/* avoid a memory leak */
3965 	pci_restore_state(pdev);
3966 
3967 	iounmap(mgp->sram);
3968 	arch_phys_wc_del(mgp->wc_cookie);
3969 	myri10ge_free_slices(mgp);
3970 	kfree(mgp->msix_vectors);
3971 	dma_free_coherent(&pdev->dev, sizeof(*mgp->cmd),
3972 			  mgp->cmd, mgp->cmd_bus);
3973 
3974 	set_fw_name(mgp, NULL, false);
3975 	free_netdev(netdev);
3976 	pci_disable_device(pdev);
3977 }
3978 
3979 #define PCI_DEVICE_ID_MYRICOM_MYRI10GE_Z8E 	0x0008
3980 #define PCI_DEVICE_ID_MYRICOM_MYRI10GE_Z8E_9	0x0009
3981 
3982 static const struct pci_device_id myri10ge_pci_tbl[] = {
3983 	{PCI_DEVICE(PCI_VENDOR_ID_MYRICOM, PCI_DEVICE_ID_MYRICOM_MYRI10GE_Z8E)},
3984 	{PCI_DEVICE
3985 	 (PCI_VENDOR_ID_MYRICOM, PCI_DEVICE_ID_MYRICOM_MYRI10GE_Z8E_9)},
3986 	{0},
3987 };
3988 
3989 MODULE_DEVICE_TABLE(pci, myri10ge_pci_tbl);
3990 
3991 static SIMPLE_DEV_PM_OPS(myri10ge_pm_ops, myri10ge_suspend, myri10ge_resume);
3992 
3993 static struct pci_driver myri10ge_driver = {
3994 	.name = "myri10ge",
3995 	.probe = myri10ge_probe,
3996 	.remove = myri10ge_remove,
3997 	.id_table = myri10ge_pci_tbl,
3998 	.driver.pm = &myri10ge_pm_ops,
3999 };
4000 
4001 #ifdef CONFIG_MYRI10GE_DCA
4002 static int
4003 myri10ge_notify_dca(struct notifier_block *nb, unsigned long event, void *p)
4004 {
4005 	int err = driver_for_each_device(&myri10ge_driver.driver,
4006 					 NULL, &event,
4007 					 myri10ge_notify_dca_device);
4008 
4009 	if (err)
4010 		return NOTIFY_BAD;
4011 	return NOTIFY_DONE;
4012 }
4013 
4014 static struct notifier_block myri10ge_dca_notifier = {
4015 	.notifier_call = myri10ge_notify_dca,
4016 	.next = NULL,
4017 	.priority = 0,
4018 };
4019 #endif				/* CONFIG_MYRI10GE_DCA */
4020 
4021 static __init int myri10ge_init_module(void)
4022 {
4023 	pr_info("Version %s\n", MYRI10GE_VERSION_STR);
4024 
4025 	if (myri10ge_rss_hash > MXGEFW_RSS_HASH_TYPE_MAX) {
4026 		pr_err("Illegal rssh hash type %d, defaulting to source port\n",
4027 		       myri10ge_rss_hash);
4028 		myri10ge_rss_hash = MXGEFW_RSS_HASH_TYPE_SRC_PORT;
4029 	}
4030 #ifdef CONFIG_MYRI10GE_DCA
4031 	dca_register_notify(&myri10ge_dca_notifier);
4032 #endif
4033 	if (myri10ge_max_slices > MYRI10GE_MAX_SLICES)
4034 		myri10ge_max_slices = MYRI10GE_MAX_SLICES;
4035 
4036 	return pci_register_driver(&myri10ge_driver);
4037 }
4038 
4039 module_init(myri10ge_init_module);
4040 
4041 static __exit void myri10ge_cleanup_module(void)
4042 {
4043 #ifdef CONFIG_MYRI10GE_DCA
4044 	dca_unregister_notify(&myri10ge_dca_notifier);
4045 #endif
4046 	pci_unregister_driver(&myri10ge_driver);
4047 }
4048 
4049 module_exit(myri10ge_cleanup_module);
4050