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1 | /**************************************************************************** |
2 | * Driver for Solarflare Solarstorm network controllers and boards | |
3 | * Copyright 2005-2006 Fen Systems Ltd. | |
4 | * Copyright 2005-2008 Solarflare Communications Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published | |
8 | * by the Free Software Foundation, incorporated herein by reference. | |
9 | */ | |
10 | ||
11 | /* Common definitions for all Efx net driver code */ | |
12 | ||
13 | #ifndef EFX_NET_DRIVER_H | |
14 | #define EFX_NET_DRIVER_H | |
15 | ||
16 | #include <linux/version.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/etherdevice.h> | |
19 | #include <linux/ethtool.h> | |
20 | #include <linux/if_vlan.h> | |
21 | #include <linux/timer.h> | |
68e7f45e | 22 | #include <linux/mdio.h> |
8ceee660 BH |
23 | #include <linux/list.h> |
24 | #include <linux/pci.h> | |
25 | #include <linux/device.h> | |
26 | #include <linux/highmem.h> | |
27 | #include <linux/workqueue.h> | |
37b5a603 | 28 | #include <linux/i2c.h> |
8ceee660 BH |
29 | |
30 | #include "enum.h" | |
31 | #include "bitfield.h" | |
8ceee660 | 32 | |
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33 | /************************************************************************** |
34 | * | |
35 | * Build definitions | |
36 | * | |
37 | **************************************************************************/ | |
38 | #ifndef EFX_DRIVER_NAME | |
39 | #define EFX_DRIVER_NAME "sfc" | |
40 | #endif | |
a7a81fc0 | 41 | #define EFX_DRIVER_VERSION "2.3" |
8ceee660 BH |
42 | |
43 | #ifdef EFX_ENABLE_DEBUG | |
44 | #define EFX_BUG_ON_PARANOID(x) BUG_ON(x) | |
45 | #define EFX_WARN_ON_PARANOID(x) WARN_ON(x) | |
46 | #else | |
47 | #define EFX_BUG_ON_PARANOID(x) do {} while (0) | |
48 | #define EFX_WARN_ON_PARANOID(x) do {} while (0) | |
49 | #endif | |
50 | ||
8ceee660 BH |
51 | /* Un-rate-limited logging */ |
52 | #define EFX_ERR(efx, fmt, args...) \ | |
55668611 | 53 | dev_err(&((efx)->pci_dev->dev), "ERR: %s " fmt, efx_dev_name(efx), ##args) |
8ceee660 BH |
54 | |
55 | #define EFX_INFO(efx, fmt, args...) \ | |
55668611 | 56 | dev_info(&((efx)->pci_dev->dev), "INFO: %s " fmt, efx_dev_name(efx), ##args) |
8ceee660 BH |
57 | |
58 | #ifdef EFX_ENABLE_DEBUG | |
59 | #define EFX_LOG(efx, fmt, args...) \ | |
55668611 | 60 | dev_info(&((efx)->pci_dev->dev), "DBG: %s " fmt, efx_dev_name(efx), ##args) |
8ceee660 BH |
61 | #else |
62 | #define EFX_LOG(efx, fmt, args...) \ | |
55668611 | 63 | dev_dbg(&((efx)->pci_dev->dev), "DBG: %s " fmt, efx_dev_name(efx), ##args) |
8ceee660 BH |
64 | #endif |
65 | ||
66 | #define EFX_TRACE(efx, fmt, args...) do {} while (0) | |
67 | ||
68 | #define EFX_REGDUMP(efx, fmt, args...) do {} while (0) | |
69 | ||
70 | /* Rate-limited logging */ | |
71 | #define EFX_ERR_RL(efx, fmt, args...) \ | |
72 | do {if (net_ratelimit()) EFX_ERR(efx, fmt, ##args); } while (0) | |
73 | ||
74 | #define EFX_INFO_RL(efx, fmt, args...) \ | |
75 | do {if (net_ratelimit()) EFX_INFO(efx, fmt, ##args); } while (0) | |
76 | ||
77 | #define EFX_LOG_RL(efx, fmt, args...) \ | |
78 | do {if (net_ratelimit()) EFX_LOG(efx, fmt, ##args); } while (0) | |
79 | ||
8ceee660 BH |
80 | /************************************************************************** |
81 | * | |
82 | * Efx data structures | |
83 | * | |
84 | **************************************************************************/ | |
85 | ||
86 | #define EFX_MAX_CHANNELS 32 | |
8ceee660 BH |
87 | #define EFX_MAX_RX_QUEUES EFX_MAX_CHANNELS |
88 | ||
60ac1065 BH |
89 | #define EFX_TX_QUEUE_OFFLOAD_CSUM 0 |
90 | #define EFX_TX_QUEUE_NO_CSUM 1 | |
91 | #define EFX_TX_QUEUE_COUNT 2 | |
92 | ||
8ceee660 BH |
93 | /** |
94 | * struct efx_special_buffer - An Efx special buffer | |
95 | * @addr: CPU base address of the buffer | |
96 | * @dma_addr: DMA base address of the buffer | |
97 | * @len: Buffer length, in bytes | |
98 | * @index: Buffer index within controller;s buffer table | |
99 | * @entries: Number of buffer table entries | |
100 | * | |
101 | * Special buffers are used for the event queues and the TX and RX | |
102 | * descriptor queues for each channel. They are *not* used for the | |
103 | * actual transmit and receive buffers. | |
104 | * | |
105 | * Note that for Falcon, TX and RX descriptor queues live in host memory. | |
106 | * Allocation and freeing procedures must take this into account. | |
107 | */ | |
108 | struct efx_special_buffer { | |
109 | void *addr; | |
110 | dma_addr_t dma_addr; | |
111 | unsigned int len; | |
112 | int index; | |
113 | int entries; | |
114 | }; | |
115 | ||
116 | /** | |
117 | * struct efx_tx_buffer - An Efx TX buffer | |
118 | * @skb: The associated socket buffer. | |
119 | * Set only on the final fragment of a packet; %NULL for all other | |
120 | * fragments. When this fragment completes, then we can free this | |
121 | * skb. | |
b9b39b62 BH |
122 | * @tsoh: The associated TSO header structure, or %NULL if this |
123 | * buffer is not a TSO header. | |
8ceee660 BH |
124 | * @dma_addr: DMA address of the fragment. |
125 | * @len: Length of this fragment. | |
126 | * This field is zero when the queue slot is empty. | |
127 | * @continuation: True if this fragment is not the end of a packet. | |
128 | * @unmap_single: True if pci_unmap_single should be used. | |
8ceee660 BH |
129 | * @unmap_len: Length of this fragment to unmap |
130 | */ | |
131 | struct efx_tx_buffer { | |
132 | const struct sk_buff *skb; | |
b9b39b62 | 133 | struct efx_tso_header *tsoh; |
8ceee660 BH |
134 | dma_addr_t dma_addr; |
135 | unsigned short len; | |
dc8cfa55 BH |
136 | bool continuation; |
137 | bool unmap_single; | |
8ceee660 BH |
138 | unsigned short unmap_len; |
139 | }; | |
140 | ||
141 | /** | |
142 | * struct efx_tx_queue - An Efx TX queue | |
143 | * | |
144 | * This is a ring buffer of TX fragments. | |
145 | * Since the TX completion path always executes on the same | |
146 | * CPU and the xmit path can operate on different CPUs, | |
147 | * performance is increased by ensuring that the completion | |
148 | * path and the xmit path operate on different cache lines. | |
149 | * This is particularly important if the xmit path is always | |
150 | * executing on one CPU which is different from the completion | |
151 | * path. There is also a cache line for members which are | |
152 | * read but not written on the fast path. | |
153 | * | |
154 | * @efx: The associated Efx NIC | |
155 | * @queue: DMA queue number | |
8ceee660 BH |
156 | * @channel: The associated channel |
157 | * @buffer: The software buffer ring | |
158 | * @txd: The hardware descriptor ring | |
6bc5d3a9 | 159 | * @flushed: Used when handling queue flushing |
8ceee660 BH |
160 | * @read_count: Current read pointer. |
161 | * This is the number of buffers that have been removed from both rings. | |
dc8cfa55 | 162 | * @stopped: Stopped count. |
8ceee660 BH |
163 | * Set if this TX queue is currently stopping its port. |
164 | * @insert_count: Current insert pointer | |
165 | * This is the number of buffers that have been added to the | |
166 | * software ring. | |
167 | * @write_count: Current write pointer | |
168 | * This is the number of buffers that have been added to the | |
169 | * hardware ring. | |
170 | * @old_read_count: The value of read_count when last checked. | |
171 | * This is here for performance reasons. The xmit path will | |
172 | * only get the up-to-date value of read_count if this | |
173 | * variable indicates that the queue is full. This is to | |
174 | * avoid cache-line ping-pong between the xmit path and the | |
175 | * completion path. | |
b9b39b62 BH |
176 | * @tso_headers_free: A list of TSO headers allocated for this TX queue |
177 | * that are not in use, and so available for new TSO sends. The list | |
178 | * is protected by the TX queue lock. | |
179 | * @tso_bursts: Number of times TSO xmit invoked by kernel | |
180 | * @tso_long_headers: Number of packets with headers too long for standard | |
181 | * blocks | |
182 | * @tso_packets: Number of packets via the TSO xmit path | |
8ceee660 BH |
183 | */ |
184 | struct efx_tx_queue { | |
185 | /* Members which don't change on the fast path */ | |
186 | struct efx_nic *efx ____cacheline_aligned_in_smp; | |
187 | int queue; | |
8ceee660 BH |
188 | struct efx_channel *channel; |
189 | struct efx_nic *nic; | |
190 | struct efx_tx_buffer *buffer; | |
191 | struct efx_special_buffer txd; | |
6bc5d3a9 | 192 | bool flushed; |
8ceee660 BH |
193 | |
194 | /* Members used mainly on the completion path */ | |
195 | unsigned int read_count ____cacheline_aligned_in_smp; | |
196 | int stopped; | |
197 | ||
198 | /* Members used only on the xmit path */ | |
199 | unsigned int insert_count ____cacheline_aligned_in_smp; | |
200 | unsigned int write_count; | |
201 | unsigned int old_read_count; | |
b9b39b62 BH |
202 | struct efx_tso_header *tso_headers_free; |
203 | unsigned int tso_bursts; | |
204 | unsigned int tso_long_headers; | |
205 | unsigned int tso_packets; | |
8ceee660 BH |
206 | }; |
207 | ||
208 | /** | |
209 | * struct efx_rx_buffer - An Efx RX data buffer | |
210 | * @dma_addr: DMA base address of the buffer | |
211 | * @skb: The associated socket buffer, if any. | |
212 | * If both this and page are %NULL, the buffer slot is currently free. | |
213 | * @page: The associated page buffer, if any. | |
214 | * If both this and skb are %NULL, the buffer slot is currently free. | |
215 | * @data: Pointer to ethernet header | |
216 | * @len: Buffer length, in bytes. | |
217 | * @unmap_addr: DMA address to unmap | |
218 | */ | |
219 | struct efx_rx_buffer { | |
220 | dma_addr_t dma_addr; | |
221 | struct sk_buff *skb; | |
222 | struct page *page; | |
223 | char *data; | |
224 | unsigned int len; | |
225 | dma_addr_t unmap_addr; | |
226 | }; | |
227 | ||
228 | /** | |
229 | * struct efx_rx_queue - An Efx RX queue | |
230 | * @efx: The associated Efx NIC | |
231 | * @queue: DMA queue number | |
8ceee660 BH |
232 | * @channel: The associated channel |
233 | * @buffer: The software buffer ring | |
234 | * @rxd: The hardware descriptor ring | |
235 | * @added_count: Number of buffers added to the receive queue. | |
236 | * @notified_count: Number of buffers given to NIC (<= @added_count). | |
237 | * @removed_count: Number of buffers removed from the receive queue. | |
238 | * @add_lock: Receive queue descriptor add spin lock. | |
239 | * This lock must be held in order to add buffers to the RX | |
240 | * descriptor ring (rxd and buffer) and to update added_count (but | |
241 | * not removed_count). | |
242 | * @max_fill: RX descriptor maximum fill level (<= ring size) | |
243 | * @fast_fill_trigger: RX descriptor fill level that will trigger a fast fill | |
244 | * (<= @max_fill) | |
245 | * @fast_fill_limit: The level to which a fast fill will fill | |
246 | * (@fast_fill_trigger <= @fast_fill_limit <= @max_fill) | |
247 | * @min_fill: RX descriptor minimum non-zero fill level. | |
248 | * This records the minimum fill level observed when a ring | |
249 | * refill was triggered. | |
250 | * @min_overfill: RX descriptor minimum overflow fill level. | |
251 | * This records the minimum fill level at which RX queue | |
252 | * overflow was observed. It should never be set. | |
253 | * @alloc_page_count: RX allocation strategy counter. | |
254 | * @alloc_skb_count: RX allocation strategy counter. | |
255 | * @work: Descriptor push work thread | |
256 | * @buf_page: Page for next RX buffer. | |
257 | * We can use a single page for multiple RX buffers. This tracks | |
258 | * the remaining space in the allocation. | |
259 | * @buf_dma_addr: Page's DMA address. | |
260 | * @buf_data: Page's host address. | |
6bc5d3a9 | 261 | * @flushed: Use when handling queue flushing |
8ceee660 BH |
262 | */ |
263 | struct efx_rx_queue { | |
264 | struct efx_nic *efx; | |
265 | int queue; | |
8ceee660 BH |
266 | struct efx_channel *channel; |
267 | struct efx_rx_buffer *buffer; | |
268 | struct efx_special_buffer rxd; | |
269 | ||
270 | int added_count; | |
271 | int notified_count; | |
272 | int removed_count; | |
273 | spinlock_t add_lock; | |
274 | unsigned int max_fill; | |
275 | unsigned int fast_fill_trigger; | |
276 | unsigned int fast_fill_limit; | |
277 | unsigned int min_fill; | |
278 | unsigned int min_overfill; | |
279 | unsigned int alloc_page_count; | |
280 | unsigned int alloc_skb_count; | |
281 | struct delayed_work work; | |
282 | unsigned int slow_fill_count; | |
283 | ||
284 | struct page *buf_page; | |
285 | dma_addr_t buf_dma_addr; | |
286 | char *buf_data; | |
6bc5d3a9 | 287 | bool flushed; |
8ceee660 BH |
288 | }; |
289 | ||
290 | /** | |
291 | * struct efx_buffer - An Efx general-purpose buffer | |
292 | * @addr: host base address of the buffer | |
293 | * @dma_addr: DMA base address of the buffer | |
294 | * @len: Buffer length, in bytes | |
295 | * | |
296 | * Falcon uses these buffers for its interrupt status registers and | |
297 | * MAC stats dumps. | |
298 | */ | |
299 | struct efx_buffer { | |
300 | void *addr; | |
301 | dma_addr_t dma_addr; | |
302 | unsigned int len; | |
303 | }; | |
304 | ||
305 | ||
306 | /* Flags for channel->used_flags */ | |
307 | #define EFX_USED_BY_RX 1 | |
308 | #define EFX_USED_BY_TX 2 | |
309 | #define EFX_USED_BY_RX_TX (EFX_USED_BY_RX | EFX_USED_BY_TX) | |
310 | ||
311 | enum efx_rx_alloc_method { | |
312 | RX_ALLOC_METHOD_AUTO = 0, | |
313 | RX_ALLOC_METHOD_SKB = 1, | |
314 | RX_ALLOC_METHOD_PAGE = 2, | |
315 | }; | |
316 | ||
317 | /** | |
318 | * struct efx_channel - An Efx channel | |
319 | * | |
320 | * A channel comprises an event queue, at least one TX queue, at least | |
321 | * one RX queue, and an associated tasklet for processing the event | |
322 | * queue. | |
323 | * | |
324 | * @efx: Associated Efx NIC | |
8ceee660 | 325 | * @channel: Channel instance number |
56536e9c | 326 | * @name: Name for channel and IRQ |
8ceee660 BH |
327 | * @used_flags: Channel is used by net driver |
328 | * @enabled: Channel enabled indicator | |
329 | * @irq: IRQ number (MSI and MSI-X only) | |
0d86ebd8 | 330 | * @irq_moderation: IRQ moderation value (in hardware ticks) |
8ceee660 BH |
331 | * @napi_dev: Net device used with NAPI |
332 | * @napi_str: NAPI control structure | |
333 | * @reset_work: Scheduled reset work thread | |
334 | * @work_pending: Is work pending via NAPI? | |
335 | * @eventq: Event queue buffer | |
336 | * @eventq_read_ptr: Event queue read pointer | |
337 | * @last_eventq_read_ptr: Last event queue read pointer value. | |
338 | * @eventq_magic: Event queue magic value for driver-generated test events | |
6fb70fd1 BH |
339 | * @irq_count: Number of IRQs since last adaptive moderation decision |
340 | * @irq_mod_score: IRQ moderation score | |
8ceee660 BH |
341 | * @rx_alloc_level: Watermark based heuristic counter for pushing descriptors |
342 | * and diagnostic counters | |
343 | * @rx_alloc_push_pages: RX allocation method currently in use for pushing | |
344 | * descriptors | |
8ceee660 BH |
345 | * @n_rx_tobe_disc: Count of RX_TOBE_DISC errors |
346 | * @n_rx_ip_frag_err: Count of RX IP fragment errors | |
347 | * @n_rx_ip_hdr_chksum_err: Count of RX IP header checksum errors | |
348 | * @n_rx_tcp_udp_chksum_err: Count of RX TCP and UDP checksum errors | |
349 | * @n_rx_frm_trunc: Count of RX_FRM_TRUNC errors | |
350 | * @n_rx_overlength: Count of RX_OVERLENGTH errors | |
351 | * @n_skbuff_leaks: Count of skbuffs leaked due to RX overrun | |
352 | */ | |
353 | struct efx_channel { | |
354 | struct efx_nic *efx; | |
8ceee660 | 355 | int channel; |
56536e9c | 356 | char name[IFNAMSIZ + 6]; |
8ceee660 | 357 | int used_flags; |
dc8cfa55 | 358 | bool enabled; |
8ceee660 | 359 | int irq; |
8ceee660 BH |
360 | unsigned int irq_moderation; |
361 | struct net_device *napi_dev; | |
362 | struct napi_struct napi_str; | |
dc8cfa55 | 363 | bool work_pending; |
8ceee660 BH |
364 | struct efx_special_buffer eventq; |
365 | unsigned int eventq_read_ptr; | |
366 | unsigned int last_eventq_read_ptr; | |
367 | unsigned int eventq_magic; | |
368 | ||
6fb70fd1 BH |
369 | unsigned int irq_count; |
370 | unsigned int irq_mod_score; | |
371 | ||
8ceee660 BH |
372 | int rx_alloc_level; |
373 | int rx_alloc_push_pages; | |
8ceee660 BH |
374 | |
375 | unsigned n_rx_tobe_disc; | |
376 | unsigned n_rx_ip_frag_err; | |
377 | unsigned n_rx_ip_hdr_chksum_err; | |
378 | unsigned n_rx_tcp_udp_chksum_err; | |
379 | unsigned n_rx_frm_trunc; | |
380 | unsigned n_rx_overlength; | |
381 | unsigned n_skbuff_leaks; | |
382 | ||
383 | /* Used to pipeline received packets in order to optimise memory | |
384 | * access with prefetches. | |
385 | */ | |
386 | struct efx_rx_buffer *rx_pkt; | |
dc8cfa55 | 387 | bool rx_pkt_csummed; |
8ceee660 BH |
388 | |
389 | }; | |
390 | ||
398468ed BH |
391 | enum efx_led_mode { |
392 | EFX_LED_OFF = 0, | |
393 | EFX_LED_ON = 1, | |
394 | EFX_LED_DEFAULT = 2 | |
395 | }; | |
396 | ||
c459302d BH |
397 | #define STRING_TABLE_LOOKUP(val, member) \ |
398 | ((val) < member ## _max) ? member ## _names[val] : "(invalid)" | |
399 | ||
400 | extern const char *efx_loopback_mode_names[]; | |
401 | extern const unsigned int efx_loopback_mode_max; | |
402 | #define LOOPBACK_MODE(efx) \ | |
403 | STRING_TABLE_LOOKUP((efx)->loopback_mode, efx_loopback_mode) | |
404 | ||
405 | extern const char *efx_interrupt_mode_names[]; | |
406 | extern const unsigned int efx_interrupt_mode_max; | |
407 | #define INT_MODE(efx) \ | |
408 | STRING_TABLE_LOOKUP(efx->interrupt_mode, efx_interrupt_mode) | |
409 | ||
410 | extern const char *efx_reset_type_names[]; | |
411 | extern const unsigned int efx_reset_type_max; | |
412 | #define RESET_TYPE(type) \ | |
413 | STRING_TABLE_LOOKUP(type, efx_reset_type) | |
3273c2e8 | 414 | |
8ceee660 BH |
415 | enum efx_int_mode { |
416 | /* Be careful if altering to correct macro below */ | |
417 | EFX_INT_MODE_MSIX = 0, | |
418 | EFX_INT_MODE_MSI = 1, | |
419 | EFX_INT_MODE_LEGACY = 2, | |
420 | EFX_INT_MODE_MAX /* Insert any new items before this */ | |
421 | }; | |
422 | #define EFX_INT_MODE_USE_MSI(x) (((x)->interrupt_mode) <= EFX_INT_MODE_MSI) | |
423 | ||
424 | enum phy_type { | |
425 | PHY_TYPE_NONE = 0, | |
ab377358 BH |
426 | PHY_TYPE_TXC43128 = 1, |
427 | PHY_TYPE_88E1111 = 2, | |
e6fa2eb7 | 428 | PHY_TYPE_SFX7101 = 3, |
ab377358 | 429 | PHY_TYPE_QT2022C2 = 4, |
8ceee660 | 430 | PHY_TYPE_PM8358 = 6, |
e6fa2eb7 | 431 | PHY_TYPE_SFT9001A = 8, |
d2d2c373 | 432 | PHY_TYPE_QT2025C = 9, |
e6fa2eb7 | 433 | PHY_TYPE_SFT9001B = 10, |
8ceee660 BH |
434 | PHY_TYPE_MAX /* Insert any new items before this */ |
435 | }; | |
436 | ||
eb50c0d6 | 437 | #define EFX_IS10G(efx) ((efx)->link_state.speed == 10000) |
177dfcd8 | 438 | |
8ceee660 BH |
439 | enum nic_state { |
440 | STATE_INIT = 0, | |
441 | STATE_RUNNING = 1, | |
442 | STATE_FINI = 2, | |
3c78708f | 443 | STATE_DISABLED = 3, |
8ceee660 BH |
444 | STATE_MAX, |
445 | }; | |
446 | ||
447 | /* | |
448 | * Alignment of page-allocated RX buffers | |
449 | * | |
450 | * Controls the number of bytes inserted at the start of an RX buffer. | |
451 | * This is the equivalent of NET_IP_ALIGN [which controls the alignment | |
452 | * of the skb->head for hardware DMA]. | |
453 | */ | |
13e9ab11 | 454 | #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
8ceee660 BH |
455 | #define EFX_PAGE_IP_ALIGN 0 |
456 | #else | |
457 | #define EFX_PAGE_IP_ALIGN NET_IP_ALIGN | |
458 | #endif | |
459 | ||
460 | /* | |
461 | * Alignment of the skb->head which wraps a page-allocated RX buffer | |
462 | * | |
463 | * The skb allocated to wrap an rx_buffer can have this alignment. Since | |
464 | * the data is memcpy'd from the rx_buf, it does not need to be equal to | |
465 | * EFX_PAGE_IP_ALIGN. | |
466 | */ | |
467 | #define EFX_PAGE_SKB_ALIGN 2 | |
468 | ||
469 | /* Forward declaration */ | |
470 | struct efx_nic; | |
471 | ||
472 | /* Pseudo bit-mask flow control field */ | |
473 | enum efx_fc_type { | |
3f926da8 BH |
474 | EFX_FC_RX = FLOW_CTRL_RX, |
475 | EFX_FC_TX = FLOW_CTRL_TX, | |
8ceee660 BH |
476 | EFX_FC_AUTO = 4, |
477 | }; | |
478 | ||
177dfcd8 BH |
479 | /* Supported MAC bit-mask */ |
480 | enum efx_mac_type { | |
481 | EFX_GMAC = 1, | |
482 | EFX_XMAC = 2, | |
483 | }; | |
484 | ||
eb50c0d6 BH |
485 | /** |
486 | * struct efx_link_state - Current state of the link | |
487 | * @up: Link is up | |
488 | * @fd: Link is full-duplex | |
489 | * @fc: Actual flow control flags | |
490 | * @speed: Link speed (Mbps) | |
491 | */ | |
492 | struct efx_link_state { | |
493 | bool up; | |
494 | bool fd; | |
495 | enum efx_fc_type fc; | |
496 | unsigned int speed; | |
497 | }; | |
498 | ||
177dfcd8 BH |
499 | /** |
500 | * struct efx_mac_operations - Efx MAC operations table | |
501 | * @reconfigure: Reconfigure MAC. Serialised by the mac_lock | |
502 | * @update_stats: Update statistics | |
766ca0fa BH |
503 | * @irq: Hardware MAC event callback. Serialised by the mac_lock |
504 | * @poll: Poll for hardware state. Serialised by the mac_lock | |
177dfcd8 BH |
505 | */ |
506 | struct efx_mac_operations { | |
507 | void (*reconfigure) (struct efx_nic *efx); | |
508 | void (*update_stats) (struct efx_nic *efx); | |
766ca0fa BH |
509 | void (*irq) (struct efx_nic *efx); |
510 | void (*poll) (struct efx_nic *efx); | |
177dfcd8 BH |
511 | }; |
512 | ||
8ceee660 BH |
513 | /** |
514 | * struct efx_phy_operations - Efx PHY operations table | |
515 | * @init: Initialise PHY | |
516 | * @fini: Shut down PHY | |
517 | * @reconfigure: Reconfigure PHY (e.g. for new link parameters) | |
518 | * @clear_interrupt: Clear down interrupt | |
766ca0fa | 519 | * @poll: Poll for hardware state. Serialised by the mac_lock. |
177dfcd8 BH |
520 | * @get_settings: Get ethtool settings. Serialised by the mac_lock. |
521 | * @set_settings: Set ethtool settings. Serialised by the mac_lock. | |
af4ad9bc | 522 | * @set_npage_adv: Set abilities advertised in (Extended) Next Page |
04cc8cac | 523 | * (only needed where AN bit is set in mmds) |
1796721a BH |
524 | * @num_tests: Number of PHY-specific tests/results |
525 | * @test_names: Names of the tests/results | |
526 | * @run_tests: Run tests and record results as appropriate. | |
527 | * Flags are the ethtool tests flags. | |
8ceee660 | 528 | * @mmds: MMD presence mask |
3273c2e8 | 529 | * @loopbacks: Supported loopback modes mask |
8ceee660 BH |
530 | */ |
531 | struct efx_phy_operations { | |
177dfcd8 | 532 | enum efx_mac_type macs; |
8ceee660 BH |
533 | int (*init) (struct efx_nic *efx); |
534 | void (*fini) (struct efx_nic *efx); | |
535 | void (*reconfigure) (struct efx_nic *efx); | |
536 | void (*clear_interrupt) (struct efx_nic *efx); | |
766ca0fa | 537 | void (*poll) (struct efx_nic *efx); |
177dfcd8 BH |
538 | void (*get_settings) (struct efx_nic *efx, |
539 | struct ethtool_cmd *ecmd); | |
540 | int (*set_settings) (struct efx_nic *efx, | |
541 | struct ethtool_cmd *ecmd); | |
af4ad9bc | 542 | void (*set_npage_adv) (struct efx_nic *efx, u32); |
1796721a BH |
543 | u32 num_tests; |
544 | const char *const *test_names; | |
545 | int (*run_tests) (struct efx_nic *efx, int *results, unsigned flags); | |
8ceee660 | 546 | int mmds; |
3273c2e8 | 547 | unsigned loopbacks; |
8ceee660 BH |
548 | }; |
549 | ||
f8b87c17 BH |
550 | /** |
551 | * @enum efx_phy_mode - PHY operating mode flags | |
552 | * @PHY_MODE_NORMAL: on and should pass traffic | |
553 | * @PHY_MODE_TX_DISABLED: on with TX disabled | |
3e133c44 BH |
554 | * @PHY_MODE_LOW_POWER: set to low power through MDIO |
555 | * @PHY_MODE_OFF: switched off through external control | |
f8b87c17 BH |
556 | * @PHY_MODE_SPECIAL: on but will not pass traffic |
557 | */ | |
558 | enum efx_phy_mode { | |
559 | PHY_MODE_NORMAL = 0, | |
560 | PHY_MODE_TX_DISABLED = 1, | |
3e133c44 BH |
561 | PHY_MODE_LOW_POWER = 2, |
562 | PHY_MODE_OFF = 4, | |
f8b87c17 BH |
563 | PHY_MODE_SPECIAL = 8, |
564 | }; | |
565 | ||
566 | static inline bool efx_phy_mode_disabled(enum efx_phy_mode mode) | |
567 | { | |
8c8661e4 | 568 | return !!(mode & ~PHY_MODE_TX_DISABLED); |
f8b87c17 BH |
569 | } |
570 | ||
8ceee660 BH |
571 | /* |
572 | * Efx extended statistics | |
573 | * | |
574 | * Not all statistics are provided by all supported MACs. The purpose | |
575 | * is this structure is to contain the raw statistics provided by each | |
576 | * MAC. | |
577 | */ | |
578 | struct efx_mac_stats { | |
579 | u64 tx_bytes; | |
580 | u64 tx_good_bytes; | |
581 | u64 tx_bad_bytes; | |
582 | unsigned long tx_packets; | |
583 | unsigned long tx_bad; | |
584 | unsigned long tx_pause; | |
585 | unsigned long tx_control; | |
586 | unsigned long tx_unicast; | |
587 | unsigned long tx_multicast; | |
588 | unsigned long tx_broadcast; | |
589 | unsigned long tx_lt64; | |
590 | unsigned long tx_64; | |
591 | unsigned long tx_65_to_127; | |
592 | unsigned long tx_128_to_255; | |
593 | unsigned long tx_256_to_511; | |
594 | unsigned long tx_512_to_1023; | |
595 | unsigned long tx_1024_to_15xx; | |
596 | unsigned long tx_15xx_to_jumbo; | |
597 | unsigned long tx_gtjumbo; | |
598 | unsigned long tx_collision; | |
599 | unsigned long tx_single_collision; | |
600 | unsigned long tx_multiple_collision; | |
601 | unsigned long tx_excessive_collision; | |
602 | unsigned long tx_deferred; | |
603 | unsigned long tx_late_collision; | |
604 | unsigned long tx_excessive_deferred; | |
605 | unsigned long tx_non_tcpudp; | |
606 | unsigned long tx_mac_src_error; | |
607 | unsigned long tx_ip_src_error; | |
608 | u64 rx_bytes; | |
609 | u64 rx_good_bytes; | |
610 | u64 rx_bad_bytes; | |
611 | unsigned long rx_packets; | |
612 | unsigned long rx_good; | |
613 | unsigned long rx_bad; | |
614 | unsigned long rx_pause; | |
615 | unsigned long rx_control; | |
616 | unsigned long rx_unicast; | |
617 | unsigned long rx_multicast; | |
618 | unsigned long rx_broadcast; | |
619 | unsigned long rx_lt64; | |
620 | unsigned long rx_64; | |
621 | unsigned long rx_65_to_127; | |
622 | unsigned long rx_128_to_255; | |
623 | unsigned long rx_256_to_511; | |
624 | unsigned long rx_512_to_1023; | |
625 | unsigned long rx_1024_to_15xx; | |
626 | unsigned long rx_15xx_to_jumbo; | |
627 | unsigned long rx_gtjumbo; | |
628 | unsigned long rx_bad_lt64; | |
629 | unsigned long rx_bad_64_to_15xx; | |
630 | unsigned long rx_bad_15xx_to_jumbo; | |
631 | unsigned long rx_bad_gtjumbo; | |
632 | unsigned long rx_overflow; | |
633 | unsigned long rx_missed; | |
634 | unsigned long rx_false_carrier; | |
635 | unsigned long rx_symbol_error; | |
636 | unsigned long rx_align_error; | |
637 | unsigned long rx_length_error; | |
638 | unsigned long rx_internal_error; | |
639 | unsigned long rx_good_lt64; | |
640 | }; | |
641 | ||
642 | /* Number of bits used in a multicast filter hash address */ | |
643 | #define EFX_MCAST_HASH_BITS 8 | |
644 | ||
645 | /* Number of (single-bit) entries in a multicast filter hash */ | |
646 | #define EFX_MCAST_HASH_ENTRIES (1 << EFX_MCAST_HASH_BITS) | |
647 | ||
648 | /* An Efx multicast filter hash */ | |
649 | union efx_multicast_hash { | |
650 | u8 byte[EFX_MCAST_HASH_ENTRIES / 8]; | |
651 | efx_oword_t oword[EFX_MCAST_HASH_ENTRIES / sizeof(efx_oword_t) / 8]; | |
652 | }; | |
653 | ||
654 | /** | |
655 | * struct efx_nic - an Efx NIC | |
656 | * @name: Device name (net device name or bus id before net device registered) | |
657 | * @pci_dev: The PCI device | |
658 | * @type: Controller type attributes | |
659 | * @legacy_irq: IRQ number | |
8d9853d9 BH |
660 | * @workqueue: Workqueue for port reconfigures and the HW monitor. |
661 | * Work items do not hold and must not acquire RTNL. | |
6977dc63 | 662 | * @workqueue_name: Name of workqueue |
8ceee660 BH |
663 | * @reset_work: Scheduled reset workitem |
664 | * @monitor_work: Hardware monitor workitem | |
665 | * @membase_phys: Memory BAR value as physical address | |
666 | * @membase: Memory BAR value | |
667 | * @biu_lock: BIU (bus interface unit) lock | |
668 | * @interrupt_mode: Interrupt mode | |
6fb70fd1 BH |
669 | * @irq_rx_adaptive: Adaptive IRQ moderation enabled for RX event queues |
670 | * @irq_rx_moderation: IRQ moderation time for RX event queues | |
8ceee660 BH |
671 | * @state: Device state flag. Serialised by the rtnl_lock. |
672 | * @reset_pending: Pending reset method (normally RESET_TYPE_NONE) | |
673 | * @tx_queue: TX DMA queues | |
674 | * @rx_queue: RX DMA queues | |
675 | * @channel: Channels | |
0484e0db | 676 | * @next_buffer_table: First available buffer table id |
8831da7b | 677 | * @n_rx_queues: Number of RX queues |
28b581ab | 678 | * @n_channels: Number of channels in use |
8ceee660 BH |
679 | * @rx_buffer_len: RX buffer length |
680 | * @rx_buffer_order: Order (log2) of number of pages for each RX buffer | |
0484e0db BH |
681 | * @int_error_count: Number of internal errors seen recently |
682 | * @int_error_expire: Time at which error count will be expired | |
8ceee660 BH |
683 | * @irq_status: Interrupt status buffer |
684 | * @last_irq_cpu: Last CPU to handle interrupt. | |
685 | * This register is written with the SMP processor ID whenever an | |
686 | * interrupt is handled. It is used by falcon_test_interrupt() | |
687 | * to verify that an interrupt has occurred. | |
4a5b504d BH |
688 | * @spi_flash: SPI flash device |
689 | * This field will be %NULL if no flash device is present. | |
690 | * @spi_eeprom: SPI EEPROM device | |
691 | * This field will be %NULL if no EEPROM device is present. | |
f4150724 | 692 | * @spi_lock: SPI bus lock |
8ceee660 BH |
693 | * @n_rx_nodesc_drop_cnt: RX no descriptor drop count |
694 | * @nic_data: Hardware dependant state | |
8c8661e4 BH |
695 | * @mac_lock: MAC access lock. Protects @port_enabled, @phy_mode, |
696 | * @port_inhibited, efx_monitor() and efx_reconfigure_port() | |
8ceee660 | 697 | * @port_enabled: Port enabled indicator. |
766ca0fa BH |
698 | * Serialises efx_stop_all(), efx_start_all(), efx_monitor(), |
699 | * efx_phy_work(), and efx_mac_work() with kernel interfaces. Safe to read | |
700 | * under any one of the rtnl_lock, mac_lock, or netif_tx_lock, but all | |
701 | * three must be held to modify it. | |
8c8661e4 | 702 | * @port_inhibited: If set, the netif_carrier is always off. Hold the mac_lock |
8ceee660 BH |
703 | * @port_initialized: Port initialized? |
704 | * @net_dev: Operating system network device. Consider holding the rtnl lock | |
705 | * @rx_checksum_enabled: RX checksumming enabled | |
706 | * @netif_stop_count: Port stop count | |
707 | * @netif_stop_lock: Port stop lock | |
708 | * @mac_stats: MAC statistics. These include all statistics the MACs | |
709 | * can provide. Generic code converts these into a standard | |
710 | * &struct net_device_stats. | |
711 | * @stats_buffer: DMA buffer for statistics | |
8c8661e4 | 712 | * @stats_lock: Statistics update lock. Serialises statistics fetches |
1974cc20 | 713 | * @stats_disable_count: Nest count for disabling statistics fetches |
177dfcd8 | 714 | * @mac_op: MAC interface |
8ceee660 BH |
715 | * @mac_address: Permanent MAC address |
716 | * @phy_type: PHY type | |
717 | * @phy_lock: PHY access lock | |
718 | * @phy_op: PHY interface | |
719 | * @phy_data: PHY private data (including PHY-specific stats) | |
68e7f45e | 720 | * @mdio: PHY MDIO interface |
8c8661e4 | 721 | * @phy_mode: PHY operating mode. Serialised by @mac_lock. |
177dfcd8 | 722 | * @mac_up: MAC link state |
eb50c0d6 | 723 | * @link_state: Current state of the link |
8ceee660 BH |
724 | * @n_link_state_changes: Number of times the link has changed state |
725 | * @promiscuous: Promiscuous flag. Protected by netif_tx_lock. | |
726 | * @multicast_hash: Multicast hash table | |
04cc8cac | 727 | * @wanted_fc: Wanted flow control flags |
766ca0fa BH |
728 | * @phy_work: work item for dealing with PHY events |
729 | * @mac_work: work item for dealing with MAC events | |
3273c2e8 BH |
730 | * @loopback_mode: Loopback status |
731 | * @loopback_modes: Supported loopback mode bitmask | |
732 | * @loopback_selftest: Offline self-test private state | |
8ceee660 BH |
733 | * |
734 | * The @priv field of the corresponding &struct net_device points to | |
735 | * this. | |
736 | */ | |
737 | struct efx_nic { | |
738 | char name[IFNAMSIZ]; | |
739 | struct pci_dev *pci_dev; | |
740 | const struct efx_nic_type *type; | |
741 | int legacy_irq; | |
742 | struct workqueue_struct *workqueue; | |
6977dc63 | 743 | char workqueue_name[16]; |
8ceee660 BH |
744 | struct work_struct reset_work; |
745 | struct delayed_work monitor_work; | |
086ea356 | 746 | resource_size_t membase_phys; |
8ceee660 BH |
747 | void __iomem *membase; |
748 | spinlock_t biu_lock; | |
749 | enum efx_int_mode interrupt_mode; | |
6fb70fd1 BH |
750 | bool irq_rx_adaptive; |
751 | unsigned int irq_rx_moderation; | |
8ceee660 | 752 | |
8ceee660 BH |
753 | enum nic_state state; |
754 | enum reset_type reset_pending; | |
755 | ||
60ac1065 | 756 | struct efx_tx_queue tx_queue[EFX_TX_QUEUE_COUNT]; |
8ceee660 BH |
757 | struct efx_rx_queue rx_queue[EFX_MAX_RX_QUEUES]; |
758 | struct efx_channel channel[EFX_MAX_CHANNELS]; | |
759 | ||
0484e0db | 760 | unsigned next_buffer_table; |
8831da7b | 761 | int n_rx_queues; |
28b581ab | 762 | int n_channels; |
8ceee660 BH |
763 | unsigned int rx_buffer_len; |
764 | unsigned int rx_buffer_order; | |
765 | ||
0484e0db BH |
766 | unsigned int_error_count; |
767 | unsigned long int_error_expire; | |
768 | ||
8ceee660 BH |
769 | struct efx_buffer irq_status; |
770 | volatile signed int last_irq_cpu; | |
771 | ||
4a5b504d BH |
772 | struct efx_spi_device *spi_flash; |
773 | struct efx_spi_device *spi_eeprom; | |
f4150724 | 774 | struct mutex spi_lock; |
4a5b504d | 775 | |
8ceee660 BH |
776 | unsigned n_rx_nodesc_drop_cnt; |
777 | ||
5daab96d | 778 | struct falcon_nic_data *nic_data; |
8ceee660 BH |
779 | |
780 | struct mutex mac_lock; | |
766ca0fa | 781 | struct work_struct mac_work; |
dc8cfa55 | 782 | bool port_enabled; |
8c8661e4 | 783 | bool port_inhibited; |
8ceee660 | 784 | |
dc8cfa55 | 785 | bool port_initialized; |
8ceee660 | 786 | struct net_device *net_dev; |
dc8cfa55 | 787 | bool rx_checksum_enabled; |
8ceee660 BH |
788 | |
789 | atomic_t netif_stop_count; | |
790 | spinlock_t netif_stop_lock; | |
791 | ||
792 | struct efx_mac_stats mac_stats; | |
793 | struct efx_buffer stats_buffer; | |
794 | spinlock_t stats_lock; | |
1974cc20 | 795 | unsigned int stats_disable_count; |
8ceee660 | 796 | |
177dfcd8 | 797 | struct efx_mac_operations *mac_op; |
8ceee660 BH |
798 | unsigned char mac_address[ETH_ALEN]; |
799 | ||
800 | enum phy_type phy_type; | |
801 | spinlock_t phy_lock; | |
766ca0fa | 802 | struct work_struct phy_work; |
8ceee660 BH |
803 | struct efx_phy_operations *phy_op; |
804 | void *phy_data; | |
68e7f45e | 805 | struct mdio_if_info mdio; |
f8b87c17 | 806 | enum efx_phy_mode phy_mode; |
8ceee660 | 807 | |
177dfcd8 | 808 | bool mac_up; |
eb50c0d6 | 809 | struct efx_link_state link_state; |
8ceee660 BH |
810 | unsigned int n_link_state_changes; |
811 | ||
dc8cfa55 | 812 | bool promiscuous; |
8ceee660 | 813 | union efx_multicast_hash multicast_hash; |
04cc8cac | 814 | enum efx_fc_type wanted_fc; |
8ceee660 BH |
815 | |
816 | atomic_t rx_reset; | |
3273c2e8 BH |
817 | enum efx_loopback_mode loopback_mode; |
818 | unsigned int loopback_modes; | |
819 | ||
820 | void *loopback_selftest; | |
8ceee660 BH |
821 | }; |
822 | ||
55668611 BH |
823 | static inline int efx_dev_registered(struct efx_nic *efx) |
824 | { | |
825 | return efx->net_dev->reg_state == NETREG_REGISTERED; | |
826 | } | |
827 | ||
828 | /* Net device name, for inclusion in log messages if it has been registered. | |
829 | * Use efx->name not efx->net_dev->name so that races with (un)registration | |
830 | * are harmless. | |
831 | */ | |
832 | static inline const char *efx_dev_name(struct efx_nic *efx) | |
833 | { | |
834 | return efx_dev_registered(efx) ? efx->name : ""; | |
835 | } | |
836 | ||
8ceee660 BH |
837 | /** |
838 | * struct efx_nic_type - Efx device type definition | |
8ceee660 BH |
839 | * @mem_map_size: Memory BAR mapped size |
840 | * @txd_ptr_tbl_base: TX descriptor ring base address | |
841 | * @rxd_ptr_tbl_base: RX descriptor ring base address | |
842 | * @buf_tbl_base: Buffer table base address | |
843 | * @evq_ptr_tbl_base: Event queue pointer table base address | |
844 | * @evq_rptr_tbl_base: Event queue read-pointer table base address | |
8ceee660 | 845 | * @max_dma_mask: Maximum possible DMA mask |
8ceee660 BH |
846 | * @rx_buffer_padding: Padding added to each RX buffer |
847 | * @max_interrupt_mode: Highest capability interrupt mode supported | |
848 | * from &enum efx_init_mode. | |
849 | * @phys_addr_channels: Number of channels with physically addressed | |
850 | * descriptors | |
851 | */ | |
852 | struct efx_nic_type { | |
8ceee660 BH |
853 | unsigned int mem_map_size; |
854 | unsigned int txd_ptr_tbl_base; | |
855 | unsigned int rxd_ptr_tbl_base; | |
856 | unsigned int buf_tbl_base; | |
857 | unsigned int evq_ptr_tbl_base; | |
858 | unsigned int evq_rptr_tbl_base; | |
859 | ||
9bbd7d9a | 860 | u64 max_dma_mask; |
8ceee660 | 861 | |
8ceee660 BH |
862 | unsigned int rx_buffer_padding; |
863 | unsigned int max_interrupt_mode; | |
864 | unsigned int phys_addr_channels; | |
865 | }; | |
866 | ||
867 | /************************************************************************** | |
868 | * | |
869 | * Prototypes and inline functions | |
870 | * | |
871 | *************************************************************************/ | |
872 | ||
873 | /* Iterate over all used channels */ | |
874 | #define efx_for_each_channel(_channel, _efx) \ | |
875 | for (_channel = &_efx->channel[0]; \ | |
876 | _channel < &_efx->channel[EFX_MAX_CHANNELS]; \ | |
877 | _channel++) \ | |
878 | if (!_channel->used_flags) \ | |
879 | continue; \ | |
880 | else | |
881 | ||
8ceee660 BH |
882 | /* Iterate over all used TX queues */ |
883 | #define efx_for_each_tx_queue(_tx_queue, _efx) \ | |
884 | for (_tx_queue = &_efx->tx_queue[0]; \ | |
60ac1065 BH |
885 | _tx_queue < &_efx->tx_queue[EFX_TX_QUEUE_COUNT]; \ |
886 | _tx_queue++) | |
8ceee660 BH |
887 | |
888 | /* Iterate over all TX queues belonging to a channel */ | |
889 | #define efx_for_each_channel_tx_queue(_tx_queue, _channel) \ | |
890 | for (_tx_queue = &_channel->efx->tx_queue[0]; \ | |
60ac1065 | 891 | _tx_queue < &_channel->efx->tx_queue[EFX_TX_QUEUE_COUNT]; \ |
8ceee660 | 892 | _tx_queue++) \ |
60ac1065 | 893 | if (_tx_queue->channel != _channel) \ |
8ceee660 BH |
894 | continue; \ |
895 | else | |
896 | ||
897 | /* Iterate over all used RX queues */ | |
898 | #define efx_for_each_rx_queue(_rx_queue, _efx) \ | |
899 | for (_rx_queue = &_efx->rx_queue[0]; \ | |
8831da7b BH |
900 | _rx_queue < &_efx->rx_queue[_efx->n_rx_queues]; \ |
901 | _rx_queue++) | |
8ceee660 BH |
902 | |
903 | /* Iterate over all RX queues belonging to a channel */ | |
904 | #define efx_for_each_channel_rx_queue(_rx_queue, _channel) \ | |
a2589027 BH |
905 | for (_rx_queue = &_channel->efx->rx_queue[_channel->channel]; \ |
906 | _rx_queue; \ | |
907 | _rx_queue = NULL) \ | |
8831da7b | 908 | if (_rx_queue->channel != _channel) \ |
8ceee660 BH |
909 | continue; \ |
910 | else | |
911 | ||
912 | /* Returns a pointer to the specified receive buffer in the RX | |
913 | * descriptor queue. | |
914 | */ | |
915 | static inline struct efx_rx_buffer *efx_rx_buffer(struct efx_rx_queue *rx_queue, | |
916 | unsigned int index) | |
917 | { | |
918 | return (&rx_queue->buffer[index]); | |
919 | } | |
920 | ||
921 | /* Set bit in a little-endian bitfield */ | |
18c2fc04 | 922 | static inline void set_bit_le(unsigned nr, unsigned char *addr) |
8ceee660 BH |
923 | { |
924 | addr[nr / 8] |= (1 << (nr % 8)); | |
925 | } | |
926 | ||
927 | /* Clear bit in a little-endian bitfield */ | |
18c2fc04 | 928 | static inline void clear_bit_le(unsigned nr, unsigned char *addr) |
8ceee660 BH |
929 | { |
930 | addr[nr / 8] &= ~(1 << (nr % 8)); | |
931 | } | |
932 | ||
933 | ||
934 | /** | |
935 | * EFX_MAX_FRAME_LEN - calculate maximum frame length | |
936 | * | |
937 | * This calculates the maximum frame length that will be used for a | |
938 | * given MTU. The frame length will be equal to the MTU plus a | |
939 | * constant amount of header space and padding. This is the quantity | |
940 | * that the net driver will program into the MAC as the maximum frame | |
941 | * length. | |
942 | * | |
943 | * The 10G MAC used in Falcon requires 8-byte alignment on the frame | |
944 | * length, so we round up to the nearest 8. | |
cc11763b BH |
945 | * |
946 | * Re-clocking by the XGXS on RX can reduce an IPG to 32 bits (half an | |
947 | * XGMII cycle). If the frame length reaches the maximum value in the | |
948 | * same cycle, the XMAC can miss the IPG altogether. We work around | |
949 | * this by adding a further 16 bytes. | |
8ceee660 BH |
950 | */ |
951 | #define EFX_MAX_FRAME_LEN(mtu) \ | |
cc11763b | 952 | ((((mtu) + ETH_HLEN + VLAN_HLEN + 4/* FCS */ + 7) & ~7) + 16) |
8ceee660 BH |
953 | |
954 | ||
955 | #endif /* EFX_NET_DRIVER_H */ |