1 | /* Broadcom NetXtreme-C/E network driver. |
2 | * |
3 | * Copyright (c) 2020 Broadcom Limited |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation. |
8 | */ |
9 | |
10 | #include <asm/byteorder.h> |
11 | #include <linux/dma-mapping.h> |
12 | #include <linux/dmapool.h> |
13 | #include <linux/errno.h> |
14 | #include <linux/ethtool.h> |
15 | #include <linux/if_ether.h> |
16 | #include <linux/io.h> |
17 | #include <linux/irq.h> |
18 | #include <linux/kernel.h> |
19 | #include <linux/list.h> |
20 | #include <linux/netdevice.h> |
21 | #include <linux/pci.h> |
22 | #include <linux/skbuff.h> |
23 | |
24 | #include "bnxt_hsi.h" |
25 | #include "bnxt.h" |
26 | #include "bnxt_hwrm.h" |
27 | |
28 | static u64 hwrm_calc_sentinel(struct bnxt_hwrm_ctx *ctx, u16 req_type) |
29 | { |
30 | return (((uintptr_t)ctx) + req_type) ^ BNXT_HWRM_SENTINEL; |
31 | } |
32 | |
33 | /** |
34 | * __hwrm_req_init() - Initialize an HWRM request. |
35 | * @bp: The driver context. |
36 | * @req: A pointer to the request pointer to initialize. |
37 | * @req_type: The request type. This will be converted to the little endian |
38 | * before being written to the req_type field of the returned request. |
39 | * @req_len: The length of the request to be allocated. |
40 | * |
41 | * Allocate DMA resources and initialize a new HWRM request object of the |
42 | * given type. The response address field in the request is configured with |
43 | * the DMA bus address that has been mapped for the response and the passed |
44 | * request is pointed to kernel virtual memory mapped for the request (such |
45 | * that short_input indirection can be accomplished without copying). The |
46 | * request’s target and completion ring are initialized to default values and |
47 | * can be overridden by writing to the returned request object directly. |
48 | * |
49 | * The initialized request can be further customized by writing to its fields |
50 | * directly, taking care to covert such fields to little endian. The request |
51 | * object will be consumed (and all its associated resources release) upon |
52 | * passing it to hwrm_req_send() unless ownership of the request has been |
53 | * claimed by the caller via a call to hwrm_req_hold(). If the request is not |
54 | * consumed, either because it is never sent or because ownership has been |
55 | * claimed, then it must be released by a call to hwrm_req_drop(). |
56 | * |
57 | * Return: zero on success, negative error code otherwise: |
58 | * E2BIG: the type of request pointer is too large to fit. |
59 | * ENOMEM: an allocation failure occurred. |
60 | */ |
61 | int __hwrm_req_init(struct bnxt *bp, void **req, u16 req_type, u32 req_len) |
62 | { |
63 | struct bnxt_hwrm_ctx *ctx; |
64 | dma_addr_t dma_handle; |
65 | u8 *req_addr; |
66 | |
67 | if (req_len > BNXT_HWRM_CTX_OFFSET) |
68 | return -E2BIG; |
69 | |
70 | req_addr = dma_pool_alloc(pool: bp->hwrm_dma_pool, GFP_KERNEL | __GFP_ZERO, |
71 | handle: &dma_handle); |
72 | if (!req_addr) |
73 | return -ENOMEM; |
74 | |
75 | ctx = (struct bnxt_hwrm_ctx *)(req_addr + BNXT_HWRM_CTX_OFFSET); |
76 | /* safety first, sentinel used to check for invalid requests */ |
77 | ctx->sentinel = hwrm_calc_sentinel(ctx, req_type); |
78 | ctx->req_len = req_len; |
79 | ctx->req = (struct input *)req_addr; |
80 | ctx->resp = (struct output *)(req_addr + BNXT_HWRM_RESP_OFFSET); |
81 | ctx->dma_handle = dma_handle; |
82 | ctx->flags = 0; /* __GFP_ZERO, but be explicit regarding ownership */ |
83 | ctx->timeout = bp->hwrm_cmd_timeout ?: DFLT_HWRM_CMD_TIMEOUT; |
84 | ctx->allocated = BNXT_HWRM_DMA_SIZE - BNXT_HWRM_CTX_OFFSET; |
85 | ctx->gfp = GFP_KERNEL; |
86 | ctx->slice_addr = NULL; |
87 | |
88 | /* initialize common request fields */ |
89 | ctx->req->req_type = cpu_to_le16(req_type); |
90 | ctx->req->resp_addr = cpu_to_le64(dma_handle + BNXT_HWRM_RESP_OFFSET); |
91 | ctx->req->cmpl_ring = cpu_to_le16(BNXT_HWRM_NO_CMPL_RING); |
92 | ctx->req->target_id = cpu_to_le16(BNXT_HWRM_TARGET); |
93 | *req = ctx->req; |
94 | |
95 | return 0; |
96 | } |
97 | |
98 | static struct bnxt_hwrm_ctx *__hwrm_ctx(struct bnxt *bp, u8 *req_addr) |
99 | { |
100 | void *ctx_addr = req_addr + BNXT_HWRM_CTX_OFFSET; |
101 | struct input *req = (struct input *)req_addr; |
102 | struct bnxt_hwrm_ctx *ctx = ctx_addr; |
103 | u64 sentinel; |
104 | |
105 | if (!req) { |
106 | /* can only be due to software bug, be loud */ |
107 | netdev_err(dev: bp->dev, format: "null HWRM request" ); |
108 | dump_stack(); |
109 | return NULL; |
110 | } |
111 | |
112 | /* HWRM API has no type safety, verify sentinel to validate address */ |
113 | sentinel = hwrm_calc_sentinel(ctx, le16_to_cpu(req->req_type)); |
114 | if (ctx->sentinel != sentinel) { |
115 | /* can only be due to software bug, be loud */ |
116 | netdev_err(dev: bp->dev, format: "HWRM sentinel mismatch, req_type = %u\n" , |
117 | (u32)le16_to_cpu(req->req_type)); |
118 | dump_stack(); |
119 | return NULL; |
120 | } |
121 | |
122 | return ctx; |
123 | } |
124 | |
125 | /** |
126 | * hwrm_req_timeout() - Set the completion timeout for the request. |
127 | * @bp: The driver context. |
128 | * @req: The request to set the timeout. |
129 | * @timeout: The timeout in milliseconds. |
130 | * |
131 | * Set the timeout associated with the request for subsequent calls to |
132 | * hwrm_req_send(). Some requests are long running and require a different |
133 | * timeout than the default. |
134 | */ |
135 | void hwrm_req_timeout(struct bnxt *bp, void *req, unsigned int timeout) |
136 | { |
137 | struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req_addr: req); |
138 | |
139 | if (ctx) |
140 | ctx->timeout = timeout; |
141 | } |
142 | |
143 | /** |
144 | * hwrm_req_alloc_flags() - Sets GFP allocation flags for slices. |
145 | * @bp: The driver context. |
146 | * @req: The request for which calls to hwrm_req_dma_slice() will have altered |
147 | * allocation flags. |
148 | * @gfp: A bitmask of GFP flags. These flags are passed to dma_alloc_coherent() |
149 | * whenever it is used to allocate backing memory for slices. Note that |
150 | * calls to hwrm_req_dma_slice() will not always result in new allocations, |
151 | * however, memory suballocated from the request buffer is already |
152 | * __GFP_ZERO. |
153 | * |
154 | * Sets the GFP allocation flags associated with the request for subsequent |
155 | * calls to hwrm_req_dma_slice(). This can be useful for specifying __GFP_ZERO |
156 | * for slice allocations. |
157 | */ |
158 | void hwrm_req_alloc_flags(struct bnxt *bp, void *req, gfp_t gfp) |
159 | { |
160 | struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req_addr: req); |
161 | |
162 | if (ctx) |
163 | ctx->gfp = gfp; |
164 | } |
165 | |
166 | /** |
167 | * hwrm_req_replace() - Replace request data. |
168 | * @bp: The driver context. |
169 | * @req: The request to modify. A call to hwrm_req_replace() is conceptually |
170 | * an assignment of new_req to req. Subsequent calls to HWRM API functions, |
171 | * such as hwrm_req_send(), should thus use req and not new_req (in fact, |
172 | * calls to HWRM API functions will fail if non-managed request objects |
173 | * are passed). |
174 | * @len: The length of new_req. |
175 | * @new_req: The pre-built request to copy or reference. |
176 | * |
177 | * Replaces the request data in req with that of new_req. This is useful in |
178 | * scenarios where a request object has already been constructed by a third |
179 | * party prior to creating a resource managed request using hwrm_req_init(). |
180 | * Depending on the length, hwrm_req_replace() will either copy the new |
181 | * request data into the DMA memory allocated for req, or it will simply |
182 | * reference the new request and use it in lieu of req during subsequent |
183 | * calls to hwrm_req_send(). The resource management is associated with |
184 | * req and is independent of and does not apply to new_req. The caller must |
185 | * ensure that the lifetime of new_req is least as long as req. Any slices |
186 | * that may have been associated with the original request are released. |
187 | * |
188 | * Return: zero on success, negative error code otherwise: |
189 | * E2BIG: Request is too large. |
190 | * EINVAL: Invalid request to modify. |
191 | */ |
192 | int hwrm_req_replace(struct bnxt *bp, void *req, void *new_req, u32 len) |
193 | { |
194 | struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req_addr: req); |
195 | struct input *internal_req = req; |
196 | u16 req_type; |
197 | |
198 | if (!ctx) |
199 | return -EINVAL; |
200 | |
201 | if (len > BNXT_HWRM_CTX_OFFSET) |
202 | return -E2BIG; |
203 | |
204 | /* free any existing slices */ |
205 | ctx->allocated = BNXT_HWRM_DMA_SIZE - BNXT_HWRM_CTX_OFFSET; |
206 | if (ctx->slice_addr) { |
207 | dma_free_coherent(dev: &bp->pdev->dev, size: ctx->slice_size, |
208 | cpu_addr: ctx->slice_addr, dma_handle: ctx->slice_handle); |
209 | ctx->slice_addr = NULL; |
210 | } |
211 | ctx->gfp = GFP_KERNEL; |
212 | |
213 | if ((bp->fw_cap & BNXT_FW_CAP_SHORT_CMD) || len > BNXT_HWRM_MAX_REQ_LEN) { |
214 | memcpy(internal_req, new_req, len); |
215 | } else { |
216 | internal_req->req_type = ((struct input *)new_req)->req_type; |
217 | ctx->req = new_req; |
218 | } |
219 | |
220 | ctx->req_len = len; |
221 | ctx->req->resp_addr = cpu_to_le64(ctx->dma_handle + |
222 | BNXT_HWRM_RESP_OFFSET); |
223 | |
224 | /* update sentinel for potentially new request type */ |
225 | req_type = le16_to_cpu(internal_req->req_type); |
226 | ctx->sentinel = hwrm_calc_sentinel(ctx, req_type); |
227 | |
228 | return 0; |
229 | } |
230 | |
231 | /** |
232 | * hwrm_req_flags() - Set non internal flags of the ctx |
233 | * @bp: The driver context. |
234 | * @req: The request containing the HWRM command |
235 | * @flags: ctx flags that don't have BNXT_HWRM_INTERNAL_FLAG set |
236 | * |
237 | * ctx flags can be used by the callers to instruct how the subsequent |
238 | * hwrm_req_send() should behave. Example: callers can use hwrm_req_flags |
239 | * with BNXT_HWRM_CTX_SILENT to omit kernel prints of errors of hwrm_req_send() |
240 | * or with BNXT_HWRM_FULL_WAIT enforce hwrm_req_send() to wait for full timeout |
241 | * even if FW is not responding. |
242 | * This generic function can be used to set any flag that is not an internal flag |
243 | * of the HWRM module. |
244 | */ |
245 | void hwrm_req_flags(struct bnxt *bp, void *req, enum bnxt_hwrm_ctx_flags flags) |
246 | { |
247 | struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req_addr: req); |
248 | |
249 | if (ctx) |
250 | ctx->flags |= (flags & HWRM_API_FLAGS); |
251 | } |
252 | |
253 | /** |
254 | * hwrm_req_hold() - Claim ownership of the request's resources. |
255 | * @bp: The driver context. |
256 | * @req: A pointer to the request to own. The request will no longer be |
257 | * consumed by calls to hwrm_req_send(). |
258 | * |
259 | * Take ownership of the request. Ownership places responsibility on the |
260 | * caller to free the resources associated with the request via a call to |
261 | * hwrm_req_drop(). The caller taking ownership implies that a subsequent |
262 | * call to hwrm_req_send() will not consume the request (ie. sending will |
263 | * not free the associated resources if the request is owned by the caller). |
264 | * Taking ownership returns a reference to the response. Retaining and |
265 | * accessing the response data is the most common reason to take ownership |
266 | * of the request. Ownership can also be acquired in order to reuse the same |
267 | * request object across multiple invocations of hwrm_req_send(). |
268 | * |
269 | * Return: A pointer to the response object. |
270 | * |
271 | * The resources associated with the response will remain available to the |
272 | * caller until ownership of the request is relinquished via a call to |
273 | * hwrm_req_drop(). It is not possible for hwrm_req_hold() to return NULL if |
274 | * a valid request is provided. A returned NULL value would imply a driver |
275 | * bug and the implementation will complain loudly in the logs to aid in |
276 | * detection. It should not be necessary to check the result for NULL. |
277 | */ |
278 | void *hwrm_req_hold(struct bnxt *bp, void *req) |
279 | { |
280 | struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req_addr: req); |
281 | struct input *input = (struct input *)req; |
282 | |
283 | if (!ctx) |
284 | return NULL; |
285 | |
286 | if (ctx->flags & BNXT_HWRM_INTERNAL_CTX_OWNED) { |
287 | /* can only be due to software bug, be loud */ |
288 | netdev_err(dev: bp->dev, format: "HWRM context already owned, req_type = %u\n" , |
289 | (u32)le16_to_cpu(input->req_type)); |
290 | dump_stack(); |
291 | return NULL; |
292 | } |
293 | |
294 | ctx->flags |= BNXT_HWRM_INTERNAL_CTX_OWNED; |
295 | return ((u8 *)req) + BNXT_HWRM_RESP_OFFSET; |
296 | } |
297 | |
298 | static void __hwrm_ctx_drop(struct bnxt *bp, struct bnxt_hwrm_ctx *ctx) |
299 | { |
300 | void *addr = ((u8 *)ctx) - BNXT_HWRM_CTX_OFFSET; |
301 | dma_addr_t dma_handle = ctx->dma_handle; /* save before invalidate */ |
302 | |
303 | /* unmap any auxiliary DMA slice */ |
304 | if (ctx->slice_addr) |
305 | dma_free_coherent(dev: &bp->pdev->dev, size: ctx->slice_size, |
306 | cpu_addr: ctx->slice_addr, dma_handle: ctx->slice_handle); |
307 | |
308 | /* invalidate, ensure ownership, sentinel and dma_handle are cleared */ |
309 | memset(ctx, 0, sizeof(struct bnxt_hwrm_ctx)); |
310 | |
311 | /* return the buffer to the DMA pool */ |
312 | if (dma_handle) |
313 | dma_pool_free(pool: bp->hwrm_dma_pool, vaddr: addr, addr: dma_handle); |
314 | } |
315 | |
316 | /** |
317 | * hwrm_req_drop() - Release all resources associated with the request. |
318 | * @bp: The driver context. |
319 | * @req: The request to consume, releasing the associated resources. The |
320 | * request object, any slices, and its associated response are no |
321 | * longer valid. |
322 | * |
323 | * It is legal to call hwrm_req_drop() on an unowned request, provided it |
324 | * has not already been consumed by hwrm_req_send() (for example, to release |
325 | * an aborted request). A given request should not be dropped more than once, |
326 | * nor should it be dropped after having been consumed by hwrm_req_send(). To |
327 | * do so is an error (the context will not be found and a stack trace will be |
328 | * rendered in the kernel log). |
329 | */ |
330 | void hwrm_req_drop(struct bnxt *bp, void *req) |
331 | { |
332 | struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req_addr: req); |
333 | |
334 | if (ctx) |
335 | __hwrm_ctx_drop(bp, ctx); |
336 | } |
337 | |
338 | static int __hwrm_to_stderr(u32 hwrm_err) |
339 | { |
340 | switch (hwrm_err) { |
341 | case HWRM_ERR_CODE_SUCCESS: |
342 | return 0; |
343 | case HWRM_ERR_CODE_RESOURCE_LOCKED: |
344 | return -EROFS; |
345 | case HWRM_ERR_CODE_RESOURCE_ACCESS_DENIED: |
346 | return -EACCES; |
347 | case HWRM_ERR_CODE_RESOURCE_ALLOC_ERROR: |
348 | return -ENOSPC; |
349 | case HWRM_ERR_CODE_INVALID_PARAMS: |
350 | case HWRM_ERR_CODE_INVALID_FLAGS: |
351 | case HWRM_ERR_CODE_INVALID_ENABLES: |
352 | case HWRM_ERR_CODE_UNSUPPORTED_TLV: |
353 | case HWRM_ERR_CODE_UNSUPPORTED_OPTION_ERR: |
354 | return -EINVAL; |
355 | case HWRM_ERR_CODE_NO_BUFFER: |
356 | return -ENOMEM; |
357 | case HWRM_ERR_CODE_HOT_RESET_PROGRESS: |
358 | case HWRM_ERR_CODE_BUSY: |
359 | return -EAGAIN; |
360 | case HWRM_ERR_CODE_CMD_NOT_SUPPORTED: |
361 | return -EOPNOTSUPP; |
362 | case HWRM_ERR_CODE_PF_UNAVAILABLE: |
363 | return -ENODEV; |
364 | default: |
365 | return -EIO; |
366 | } |
367 | } |
368 | |
369 | static struct bnxt_hwrm_wait_token * |
370 | __hwrm_acquire_token(struct bnxt *bp, enum bnxt_hwrm_chnl dst) |
371 | { |
372 | struct bnxt_hwrm_wait_token *token; |
373 | |
374 | token = kzalloc(size: sizeof(*token), GFP_KERNEL); |
375 | if (!token) |
376 | return NULL; |
377 | |
378 | mutex_lock(&bp->hwrm_cmd_lock); |
379 | |
380 | token->dst = dst; |
381 | token->state = BNXT_HWRM_PENDING; |
382 | if (dst == BNXT_HWRM_CHNL_CHIMP) { |
383 | token->seq_id = bp->hwrm_cmd_seq++; |
384 | hlist_add_head_rcu(n: &token->node, h: &bp->hwrm_pending_list); |
385 | } else { |
386 | token->seq_id = bp->hwrm_cmd_kong_seq++; |
387 | } |
388 | |
389 | return token; |
390 | } |
391 | |
392 | static void |
393 | __hwrm_release_token(struct bnxt *bp, struct bnxt_hwrm_wait_token *token) |
394 | { |
395 | if (token->dst == BNXT_HWRM_CHNL_CHIMP) { |
396 | hlist_del_rcu(n: &token->node); |
397 | kfree_rcu(token, rcu); |
398 | } else { |
399 | kfree(objp: token); |
400 | } |
401 | mutex_unlock(lock: &bp->hwrm_cmd_lock); |
402 | } |
403 | |
404 | void |
405 | hwrm_update_token(struct bnxt *bp, u16 seq_id, enum bnxt_hwrm_wait_state state) |
406 | { |
407 | struct bnxt_hwrm_wait_token *token; |
408 | |
409 | rcu_read_lock(); |
410 | hlist_for_each_entry_rcu(token, &bp->hwrm_pending_list, node) { |
411 | if (token->seq_id == seq_id) { |
412 | WRITE_ONCE(token->state, state); |
413 | rcu_read_unlock(); |
414 | return; |
415 | } |
416 | } |
417 | rcu_read_unlock(); |
418 | netdev_err(dev: bp->dev, format: "Invalid hwrm seq id %d\n" , seq_id); |
419 | } |
420 | |
421 | static void hwrm_req_dbg(struct bnxt *bp, struct input *req) |
422 | { |
423 | u32 ring = le16_to_cpu(req->cmpl_ring); |
424 | u32 type = le16_to_cpu(req->req_type); |
425 | u32 tgt = le16_to_cpu(req->target_id); |
426 | u32 seq = le16_to_cpu(req->seq_id); |
427 | char opt[32] = "\n" ; |
428 | |
429 | if (unlikely(ring != (u16)BNXT_HWRM_NO_CMPL_RING)) |
430 | snprintf(buf: opt, size: 16, fmt: " ring %d\n" , ring); |
431 | |
432 | if (unlikely(tgt != BNXT_HWRM_TARGET)) |
433 | snprintf(buf: opt + strlen(opt) - 1, size: 16, fmt: " tgt 0x%x\n" , tgt); |
434 | |
435 | netdev_dbg(bp->dev, "sent hwrm req_type 0x%x seq id 0x%x%s" , |
436 | type, seq, opt); |
437 | } |
438 | |
439 | #define hwrm_err(bp, ctx, fmt, ...) \ |
440 | do { \ |
441 | if ((ctx)->flags & BNXT_HWRM_CTX_SILENT) \ |
442 | netdev_dbg((bp)->dev, fmt, __VA_ARGS__); \ |
443 | else \ |
444 | netdev_err((bp)->dev, fmt, __VA_ARGS__); \ |
445 | } while (0) |
446 | |
447 | static bool hwrm_wait_must_abort(struct bnxt *bp, u32 req_type, u32 *fw_status) |
448 | { |
449 | if (req_type == HWRM_VER_GET) |
450 | return false; |
451 | |
452 | if (!bp->fw_health || !bp->fw_health->status_reliable) |
453 | return false; |
454 | |
455 | *fw_status = bnxt_fw_health_readl(bp, BNXT_FW_HEALTH_REG); |
456 | return *fw_status && !BNXT_FW_IS_HEALTHY(*fw_status); |
457 | } |
458 | |
459 | static int __hwrm_send(struct bnxt *bp, struct bnxt_hwrm_ctx *ctx) |
460 | { |
461 | u32 doorbell_offset = BNXT_GRCPF_REG_CHIMP_COMM_TRIGGER; |
462 | enum bnxt_hwrm_chnl dst = BNXT_HWRM_CHNL_CHIMP; |
463 | u32 bar_offset = BNXT_GRCPF_REG_CHIMP_COMM; |
464 | struct bnxt_hwrm_wait_token *token = NULL; |
465 | struct hwrm_short_input short_input = {0}; |
466 | u16 max_req_len = BNXT_HWRM_MAX_REQ_LEN; |
467 | unsigned int i, timeout, tmo_count; |
468 | u32 *data = (u32 *)ctx->req; |
469 | u32 msg_len = ctx->req_len; |
470 | u32 req_type, sts; |
471 | int rc = -EBUSY; |
472 | u16 len = 0; |
473 | u8 *valid; |
474 | |
475 | if (ctx->flags & BNXT_HWRM_INTERNAL_RESP_DIRTY) |
476 | memset(ctx->resp, 0, PAGE_SIZE); |
477 | |
478 | req_type = le16_to_cpu(ctx->req->req_type); |
479 | if (BNXT_NO_FW_ACCESS(bp) && |
480 | (req_type != HWRM_FUNC_RESET && req_type != HWRM_VER_GET)) { |
481 | netdev_dbg(bp->dev, "hwrm req_type 0x%x skipped, FW channel down\n" , |
482 | req_type); |
483 | goto exit; |
484 | } |
485 | |
486 | if (msg_len > BNXT_HWRM_MAX_REQ_LEN && |
487 | msg_len > bp->hwrm_max_ext_req_len) { |
488 | netdev_warn(dev: bp->dev, format: "oversized hwrm request, req_type 0x%x" , |
489 | req_type); |
490 | rc = -E2BIG; |
491 | goto exit; |
492 | } |
493 | |
494 | if (bnxt_kong_hwrm_message(bp, req: ctx->req)) { |
495 | dst = BNXT_HWRM_CHNL_KONG; |
496 | bar_offset = BNXT_GRCPF_REG_KONG_COMM; |
497 | doorbell_offset = BNXT_GRCPF_REG_KONG_COMM_TRIGGER; |
498 | if (le16_to_cpu(ctx->req->cmpl_ring) != INVALID_HW_RING_ID) { |
499 | netdev_err(dev: bp->dev, format: "Ring completions not supported for KONG commands, req_type = %d\n" , |
500 | req_type); |
501 | rc = -EINVAL; |
502 | goto exit; |
503 | } |
504 | } |
505 | |
506 | token = __hwrm_acquire_token(bp, dst); |
507 | if (!token) { |
508 | rc = -ENOMEM; |
509 | goto exit; |
510 | } |
511 | ctx->req->seq_id = cpu_to_le16(token->seq_id); |
512 | |
513 | if ((bp->fw_cap & BNXT_FW_CAP_SHORT_CMD) || |
514 | msg_len > BNXT_HWRM_MAX_REQ_LEN) { |
515 | short_input.req_type = ctx->req->req_type; |
516 | short_input.signature = |
517 | cpu_to_le16(SHORT_REQ_SIGNATURE_SHORT_CMD); |
518 | short_input.size = cpu_to_le16(msg_len); |
519 | short_input.req_addr = cpu_to_le64(ctx->dma_handle); |
520 | |
521 | data = (u32 *)&short_input; |
522 | msg_len = sizeof(short_input); |
523 | |
524 | max_req_len = BNXT_HWRM_SHORT_REQ_LEN; |
525 | } |
526 | |
527 | /* Ensure any associated DMA buffers are written before doorbell */ |
528 | wmb(); |
529 | |
530 | /* Write request msg to hwrm channel */ |
531 | __iowrite32_copy(to: bp->bar0 + bar_offset, from: data, count: msg_len / 4); |
532 | |
533 | for (i = msg_len; i < max_req_len; i += 4) |
534 | writel(val: 0, addr: bp->bar0 + bar_offset + i); |
535 | |
536 | /* Ring channel doorbell */ |
537 | writel(val: 1, addr: bp->bar0 + doorbell_offset); |
538 | |
539 | hwrm_req_dbg(bp, req: ctx->req); |
540 | |
541 | if (!pci_is_enabled(pdev: bp->pdev)) { |
542 | rc = -ENODEV; |
543 | goto exit; |
544 | } |
545 | |
546 | /* Limit timeout to an upper limit */ |
547 | timeout = min(ctx->timeout, bp->hwrm_cmd_max_timeout ?: HWRM_CMD_MAX_TIMEOUT); |
548 | /* convert timeout to usec */ |
549 | timeout *= 1000; |
550 | |
551 | i = 0; |
552 | /* Short timeout for the first few iterations: |
553 | * number of loops = number of loops for short timeout + |
554 | * number of loops for standard timeout. |
555 | */ |
556 | tmo_count = HWRM_SHORT_TIMEOUT_COUNTER; |
557 | timeout = timeout - HWRM_SHORT_MIN_TIMEOUT * HWRM_SHORT_TIMEOUT_COUNTER; |
558 | tmo_count += DIV_ROUND_UP(timeout, HWRM_MIN_TIMEOUT); |
559 | |
560 | if (le16_to_cpu(ctx->req->cmpl_ring) != INVALID_HW_RING_ID) { |
561 | /* Wait until hwrm response cmpl interrupt is processed */ |
562 | while (READ_ONCE(token->state) < BNXT_HWRM_COMPLETE && |
563 | i++ < tmo_count) { |
564 | /* Abort the wait for completion if the FW health |
565 | * check has failed. |
566 | */ |
567 | if (test_bit(BNXT_STATE_FW_FATAL_COND, &bp->state)) |
568 | goto exit; |
569 | /* on first few passes, just barely sleep */ |
570 | if (i < HWRM_SHORT_TIMEOUT_COUNTER) { |
571 | usleep_range(HWRM_SHORT_MIN_TIMEOUT, |
572 | HWRM_SHORT_MAX_TIMEOUT); |
573 | } else { |
574 | if (hwrm_wait_must_abort(bp, req_type, fw_status: &sts)) { |
575 | hwrm_err(bp, ctx, "Resp cmpl intr abandoning msg: 0x%x due to firmware status: 0x%x\n" , |
576 | req_type, sts); |
577 | goto exit; |
578 | } |
579 | usleep_range(HWRM_MIN_TIMEOUT, |
580 | HWRM_MAX_TIMEOUT); |
581 | } |
582 | } |
583 | |
584 | if (READ_ONCE(token->state) != BNXT_HWRM_COMPLETE) { |
585 | hwrm_err(bp, ctx, "Resp cmpl intr err msg: 0x%x\n" , |
586 | req_type); |
587 | goto exit; |
588 | } |
589 | len = le16_to_cpu(READ_ONCE(ctx->resp->resp_len)); |
590 | valid = ((u8 *)ctx->resp) + len - 1; |
591 | } else { |
592 | __le16 seen_out_of_seq = ctx->req->seq_id; /* will never see */ |
593 | int j; |
594 | |
595 | /* Check if response len is updated */ |
596 | for (i = 0; i < tmo_count; i++) { |
597 | /* Abort the wait for completion if the FW health |
598 | * check has failed. |
599 | */ |
600 | if (test_bit(BNXT_STATE_FW_FATAL_COND, &bp->state)) |
601 | goto exit; |
602 | |
603 | if (token && |
604 | READ_ONCE(token->state) == BNXT_HWRM_DEFERRED) { |
605 | __hwrm_release_token(bp, token); |
606 | token = NULL; |
607 | } |
608 | |
609 | len = le16_to_cpu(READ_ONCE(ctx->resp->resp_len)); |
610 | if (len) { |
611 | __le16 resp_seq = READ_ONCE(ctx->resp->seq_id); |
612 | |
613 | if (resp_seq == ctx->req->seq_id) |
614 | break; |
615 | if (resp_seq != seen_out_of_seq) { |
616 | netdev_warn(dev: bp->dev, format: "Discarding out of seq response: 0x%x for msg {0x%x 0x%x}\n" , |
617 | le16_to_cpu(resp_seq), |
618 | req_type, |
619 | le16_to_cpu(ctx->req->seq_id)); |
620 | seen_out_of_seq = resp_seq; |
621 | } |
622 | } |
623 | |
624 | /* on first few passes, just barely sleep */ |
625 | if (i < HWRM_SHORT_TIMEOUT_COUNTER) { |
626 | usleep_range(HWRM_SHORT_MIN_TIMEOUT, |
627 | HWRM_SHORT_MAX_TIMEOUT); |
628 | } else { |
629 | if (hwrm_wait_must_abort(bp, req_type, fw_status: &sts)) { |
630 | hwrm_err(bp, ctx, "Abandoning msg {0x%x 0x%x} len: %d due to firmware status: 0x%x\n" , |
631 | req_type, |
632 | le16_to_cpu(ctx->req->seq_id), |
633 | len, sts); |
634 | goto exit; |
635 | } |
636 | usleep_range(HWRM_MIN_TIMEOUT, |
637 | HWRM_MAX_TIMEOUT); |
638 | } |
639 | } |
640 | |
641 | if (i >= tmo_count) { |
642 | hwrm_err(bp, ctx, "Error (timeout: %u) msg {0x%x 0x%x} len:%d\n" , |
643 | hwrm_total_timeout(i), req_type, |
644 | le16_to_cpu(ctx->req->seq_id), len); |
645 | goto exit; |
646 | } |
647 | |
648 | /* Last byte of resp contains valid bit */ |
649 | valid = ((u8 *)ctx->resp) + len - 1; |
650 | for (j = 0; j < HWRM_VALID_BIT_DELAY_USEC; ) { |
651 | /* make sure we read from updated DMA memory */ |
652 | dma_rmb(); |
653 | if (*valid) |
654 | break; |
655 | if (j < 10) { |
656 | udelay(1); |
657 | j++; |
658 | } else { |
659 | usleep_range(min: 20, max: 30); |
660 | j += 20; |
661 | } |
662 | } |
663 | |
664 | if (j >= HWRM_VALID_BIT_DELAY_USEC) { |
665 | hwrm_err(bp, ctx, "Error (timeout: %u) msg {0x%x 0x%x} len:%d v:%d\n" , |
666 | hwrm_total_timeout(i) + j, req_type, |
667 | le16_to_cpu(ctx->req->seq_id), len, *valid); |
668 | goto exit; |
669 | } |
670 | } |
671 | |
672 | /* Zero valid bit for compatibility. Valid bit in an older spec |
673 | * may become a new field in a newer spec. We must make sure that |
674 | * a new field not implemented by old spec will read zero. |
675 | */ |
676 | *valid = 0; |
677 | rc = le16_to_cpu(ctx->resp->error_code); |
678 | if (rc == HWRM_ERR_CODE_BUSY && !(ctx->flags & BNXT_HWRM_CTX_SILENT)) |
679 | netdev_warn(dev: bp->dev, format: "FW returned busy, hwrm req_type 0x%x\n" , |
680 | req_type); |
681 | else if (rc && rc != HWRM_ERR_CODE_PF_UNAVAILABLE) |
682 | hwrm_err(bp, ctx, "hwrm req_type 0x%x seq id 0x%x error 0x%x\n" , |
683 | req_type, token->seq_id, rc); |
684 | rc = __hwrm_to_stderr(hwrm_err: rc); |
685 | exit: |
686 | if (token) |
687 | __hwrm_release_token(bp, token); |
688 | if (ctx->flags & BNXT_HWRM_INTERNAL_CTX_OWNED) |
689 | ctx->flags |= BNXT_HWRM_INTERNAL_RESP_DIRTY; |
690 | else |
691 | __hwrm_ctx_drop(bp, ctx); |
692 | return rc; |
693 | } |
694 | |
695 | /** |
696 | * hwrm_req_send() - Execute an HWRM command. |
697 | * @bp: The driver context. |
698 | * @req: A pointer to the request to send. The DMA resources associated with |
699 | * the request will be released (ie. the request will be consumed) unless |
700 | * ownership of the request has been assumed by the caller via a call to |
701 | * hwrm_req_hold(). |
702 | * |
703 | * Send an HWRM request to the device and wait for a response. The request is |
704 | * consumed if it is not owned by the caller. This function will block until |
705 | * the request has either completed or times out due to an error. |
706 | * |
707 | * Return: A result code. |
708 | * |
709 | * The result is zero on success, otherwise the negative error code indicates |
710 | * one of the following errors: |
711 | * E2BIG: The request was too large. |
712 | * EBUSY: The firmware is in a fatal state or the request timed out |
713 | * EACCESS: HWRM access denied. |
714 | * ENOSPC: HWRM resource allocation error. |
715 | * EINVAL: Request parameters are invalid. |
716 | * ENOMEM: HWRM has no buffers. |
717 | * EAGAIN: HWRM busy or reset in progress. |
718 | * EOPNOTSUPP: Invalid request type. |
719 | * EIO: Any other error. |
720 | * Error handling is orthogonal to request ownership. An unowned request will |
721 | * still be consumed on error. If the caller owns the request, then the caller |
722 | * is responsible for releasing the resources. Otherwise, hwrm_req_send() will |
723 | * always consume the request. |
724 | */ |
725 | int hwrm_req_send(struct bnxt *bp, void *req) |
726 | { |
727 | struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req_addr: req); |
728 | |
729 | if (!ctx) |
730 | return -EINVAL; |
731 | |
732 | return __hwrm_send(bp, ctx); |
733 | } |
734 | |
735 | /** |
736 | * hwrm_req_send_silent() - A silent version of hwrm_req_send(). |
737 | * @bp: The driver context. |
738 | * @req: The request to send without logging. |
739 | * |
740 | * The same as hwrm_req_send(), except that the request is silenced using |
741 | * hwrm_req_silence() prior the call. This version of the function is |
742 | * provided solely to preserve the legacy API’s flavor for this functionality. |
743 | * |
744 | * Return: A result code, see hwrm_req_send(). |
745 | */ |
746 | int hwrm_req_send_silent(struct bnxt *bp, void *req) |
747 | { |
748 | hwrm_req_flags(bp, req, flags: BNXT_HWRM_CTX_SILENT); |
749 | return hwrm_req_send(bp, req); |
750 | } |
751 | |
752 | /** |
753 | * hwrm_req_dma_slice() - Allocate a slice of DMA mapped memory. |
754 | * @bp: The driver context. |
755 | * @req: The request for which indirect data will be associated. |
756 | * @size: The size of the allocation. |
757 | * @dma_handle: The bus address associated with the allocation. The HWRM API has |
758 | * no knowledge about the type of the request and so cannot infer how the |
759 | * caller intends to use the indirect data. Thus, the caller is |
760 | * responsible for configuring the request object appropriately to |
761 | * point to the associated indirect memory. Note, DMA handle has the |
762 | * same definition as it does in dma_alloc_coherent(), the caller is |
763 | * responsible for endian conversions via cpu_to_le64() before assigning |
764 | * this address. |
765 | * |
766 | * Allocates DMA mapped memory for indirect data related to a request. The |
767 | * lifetime of the DMA resources will be bound to that of the request (ie. |
768 | * they will be automatically released when the request is either consumed by |
769 | * hwrm_req_send() or dropped by hwrm_req_drop()). Small allocations are |
770 | * efficiently suballocated out of the request buffer space, hence the name |
771 | * slice, while larger requests are satisfied via an underlying call to |
772 | * dma_alloc_coherent(). Multiple suballocations are supported, however, only |
773 | * one externally mapped region is. |
774 | * |
775 | * Return: The kernel virtual address of the DMA mapping. |
776 | */ |
777 | void * |
778 | hwrm_req_dma_slice(struct bnxt *bp, void *req, u32 size, dma_addr_t *dma_handle) |
779 | { |
780 | struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req_addr: req); |
781 | u8 *end = ((u8 *)req) + BNXT_HWRM_DMA_SIZE; |
782 | struct input *input = req; |
783 | u8 *addr, *req_addr = req; |
784 | u32 max_offset, offset; |
785 | |
786 | if (!ctx) |
787 | return NULL; |
788 | |
789 | max_offset = BNXT_HWRM_DMA_SIZE - ctx->allocated; |
790 | offset = max_offset - size; |
791 | offset = ALIGN_DOWN(offset, BNXT_HWRM_DMA_ALIGN); |
792 | addr = req_addr + offset; |
793 | |
794 | if (addr < req_addr + max_offset && req_addr + ctx->req_len <= addr) { |
795 | ctx->allocated = end - addr; |
796 | *dma_handle = ctx->dma_handle + offset; |
797 | return addr; |
798 | } |
799 | |
800 | /* could not suballocate from ctx buffer, try create a new mapping */ |
801 | if (ctx->slice_addr) { |
802 | /* if one exists, can only be due to software bug, be loud */ |
803 | netdev_err(dev: bp->dev, format: "HWRM refusing to reallocate DMA slice, req_type = %u\n" , |
804 | (u32)le16_to_cpu(input->req_type)); |
805 | dump_stack(); |
806 | return NULL; |
807 | } |
808 | |
809 | addr = dma_alloc_coherent(dev: &bp->pdev->dev, size, dma_handle, gfp: ctx->gfp); |
810 | |
811 | if (!addr) |
812 | return NULL; |
813 | |
814 | ctx->slice_addr = addr; |
815 | ctx->slice_size = size; |
816 | ctx->slice_handle = *dma_handle; |
817 | |
818 | return addr; |
819 | } |
820 | |