1 // SPDX-License-Identifier: GPL-2.0-only
2 /****************************************************************************
3  * Driver for Solarflare network controllers and boards
4  * Copyright 2019 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 #include "net_driver.h"
12 #include "efx.h"
13 #include "nic.h"
14 #include "mcdi_functions.h"
15 #include "mcdi.h"
16 #include "mcdi_pcol.h"
17 
efx_mcdi_free_vis(struct efx_nic * efx)18 int efx_mcdi_free_vis(struct efx_nic *efx)
19 {
20 	MCDI_DECLARE_BUF_ERR(outbuf);
21 	size_t outlen;
22 	int rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FREE_VIS, NULL, 0,
23 				    outbuf, sizeof(outbuf), &outlen);
24 
25 	/* -EALREADY means nothing to free, so ignore */
26 	if (rc == -EALREADY)
27 		rc = 0;
28 	if (rc)
29 		efx_mcdi_display_error(efx, MC_CMD_FREE_VIS, 0, outbuf, outlen,
30 				       rc);
31 	return rc;
32 }
33 
efx_mcdi_alloc_vis(struct efx_nic * efx,unsigned int min_vis,unsigned int max_vis,unsigned int * vi_base,unsigned int * allocated_vis)34 int efx_mcdi_alloc_vis(struct efx_nic *efx, unsigned int min_vis,
35 		       unsigned int max_vis, unsigned int *vi_base,
36 		       unsigned int *allocated_vis)
37 {
38 	MCDI_DECLARE_BUF(outbuf, MC_CMD_ALLOC_VIS_OUT_LEN);
39 	MCDI_DECLARE_BUF(inbuf, MC_CMD_ALLOC_VIS_IN_LEN);
40 	size_t outlen;
41 	int rc;
42 
43 	MCDI_SET_DWORD(inbuf, ALLOC_VIS_IN_MIN_VI_COUNT, min_vis);
44 	MCDI_SET_DWORD(inbuf, ALLOC_VIS_IN_MAX_VI_COUNT, max_vis);
45 	rc = efx_mcdi_rpc(efx, MC_CMD_ALLOC_VIS, inbuf, sizeof(inbuf),
46 			  outbuf, sizeof(outbuf), &outlen);
47 	if (rc != 0)
48 		return rc;
49 
50 	if (outlen < MC_CMD_ALLOC_VIS_OUT_LEN)
51 		return -EIO;
52 
53 	netif_dbg(efx, drv, efx->net_dev, "base VI is A0x%03x\n",
54 		  MCDI_DWORD(outbuf, ALLOC_VIS_OUT_VI_BASE));
55 
56 	if (vi_base)
57 		*vi_base = MCDI_DWORD(outbuf, ALLOC_VIS_OUT_VI_BASE);
58 	if (allocated_vis)
59 		*allocated_vis = MCDI_DWORD(outbuf, ALLOC_VIS_OUT_VI_COUNT);
60 	return 0;
61 }
62 
efx_mcdi_ev_probe(struct efx_channel * channel)63 int efx_mcdi_ev_probe(struct efx_channel *channel)
64 {
65 	return efx_nic_alloc_buffer(channel->efx, &channel->eventq.buf,
66 				    (channel->eventq_mask + 1) *
67 				    sizeof(efx_qword_t),
68 				    GFP_KERNEL);
69 }
70 
efx_mcdi_ev_init(struct efx_channel * channel,bool v1_cut_thru,bool v2)71 int efx_mcdi_ev_init(struct efx_channel *channel, bool v1_cut_thru, bool v2)
72 {
73 	MCDI_DECLARE_BUF(inbuf,
74 			 MC_CMD_INIT_EVQ_V2_IN_LEN(EFX_MAX_EVQ_SIZE * 8 /
75 						   EFX_BUF_SIZE));
76 	MCDI_DECLARE_BUF(outbuf, MC_CMD_INIT_EVQ_V2_OUT_LEN);
77 	size_t entries = channel->eventq.buf.len / EFX_BUF_SIZE;
78 	struct efx_nic *efx = channel->efx;
79 	size_t inlen, outlen;
80 	dma_addr_t dma_addr;
81 	int rc, i;
82 
83 	/* Fill event queue with all ones (i.e. empty events) */
84 	memset(channel->eventq.buf.addr, 0xff, channel->eventq.buf.len);
85 
86 	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_SIZE, channel->eventq_mask + 1);
87 	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_INSTANCE, channel->channel);
88 	/* INIT_EVQ expects index in vector table, not absolute */
89 	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_IRQ_NUM, channel->channel);
90 	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_TMR_MODE,
91 		       MC_CMD_INIT_EVQ_IN_TMR_MODE_DIS);
92 	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_TMR_LOAD, 0);
93 	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_TMR_RELOAD, 0);
94 	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_COUNT_MODE,
95 		       MC_CMD_INIT_EVQ_IN_COUNT_MODE_DIS);
96 	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_COUNT_THRSHLD, 0);
97 
98 	if (v2) {
99 		/* Use the new generic approach to specifying event queue
100 		 * configuration, requesting lower latency or higher throughput.
101 		 * The options that actually get used appear in the output.
102 		 */
103 		MCDI_POPULATE_DWORD_2(inbuf, INIT_EVQ_V2_IN_FLAGS,
104 				      INIT_EVQ_V2_IN_FLAG_INTERRUPTING, 1,
105 				      INIT_EVQ_V2_IN_FLAG_TYPE,
106 				      MC_CMD_INIT_EVQ_V2_IN_FLAG_TYPE_AUTO);
107 	} else {
108 		MCDI_POPULATE_DWORD_4(inbuf, INIT_EVQ_IN_FLAGS,
109 				      INIT_EVQ_IN_FLAG_INTERRUPTING, 1,
110 				      INIT_EVQ_IN_FLAG_RX_MERGE, 1,
111 				      INIT_EVQ_IN_FLAG_TX_MERGE, 1,
112 				      INIT_EVQ_IN_FLAG_CUT_THRU, v1_cut_thru);
113 	}
114 
115 	dma_addr = channel->eventq.buf.dma_addr;
116 	for (i = 0; i < entries; ++i) {
117 		MCDI_SET_ARRAY_QWORD(inbuf, INIT_EVQ_IN_DMA_ADDR, i, dma_addr);
118 		dma_addr += EFX_BUF_SIZE;
119 	}
120 
121 	inlen = MC_CMD_INIT_EVQ_IN_LEN(entries);
122 
123 	rc = efx_mcdi_rpc(efx, MC_CMD_INIT_EVQ, inbuf, inlen,
124 			  outbuf, sizeof(outbuf), &outlen);
125 
126 	if (outlen >= MC_CMD_INIT_EVQ_V2_OUT_LEN)
127 		netif_dbg(efx, drv, efx->net_dev,
128 			  "Channel %d using event queue flags %08x\n",
129 			  channel->channel,
130 			  MCDI_DWORD(outbuf, INIT_EVQ_V2_OUT_FLAGS));
131 
132 	return rc;
133 }
134 
efx_mcdi_ev_remove(struct efx_channel * channel)135 void efx_mcdi_ev_remove(struct efx_channel *channel)
136 {
137 	efx_nic_free_buffer(channel->efx, &channel->eventq.buf);
138 }
139 
efx_mcdi_ev_fini(struct efx_channel * channel)140 void efx_mcdi_ev_fini(struct efx_channel *channel)
141 {
142 	MCDI_DECLARE_BUF(inbuf, MC_CMD_FINI_EVQ_IN_LEN);
143 	MCDI_DECLARE_BUF_ERR(outbuf);
144 	struct efx_nic *efx = channel->efx;
145 	size_t outlen;
146 	int rc;
147 
148 	MCDI_SET_DWORD(inbuf, FINI_EVQ_IN_INSTANCE, channel->channel);
149 
150 	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FINI_EVQ, inbuf, sizeof(inbuf),
151 				outbuf, sizeof(outbuf), &outlen);
152 
153 	if (rc && rc != -EALREADY)
154 		goto fail;
155 
156 	return;
157 
158 fail:
159 	efx_mcdi_display_error(efx, MC_CMD_FINI_EVQ, MC_CMD_FINI_EVQ_IN_LEN,
160 			       outbuf, outlen, rc);
161 }
162 
efx_mcdi_tx_init(struct efx_tx_queue * tx_queue)163 int efx_mcdi_tx_init(struct efx_tx_queue *tx_queue)
164 {
165 	MCDI_DECLARE_BUF(inbuf, MC_CMD_INIT_TXQ_IN_LEN(EFX_MAX_DMAQ_SIZE * 8 /
166 						       EFX_BUF_SIZE));
167 	bool csum_offload = tx_queue->type & EFX_TXQ_TYPE_OUTER_CSUM;
168 	bool inner_csum = tx_queue->type & EFX_TXQ_TYPE_INNER_CSUM;
169 	size_t entries = tx_queue->txd.buf.len / EFX_BUF_SIZE;
170 	struct efx_channel *channel = tx_queue->channel;
171 	struct efx_nic *efx = tx_queue->efx;
172 	dma_addr_t dma_addr;
173 	size_t inlen;
174 	int rc, i;
175 
176 	BUILD_BUG_ON(MC_CMD_INIT_TXQ_OUT_LEN != 0);
177 
178 	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_SIZE, tx_queue->ptr_mask + 1);
179 	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_TARGET_EVQ, channel->channel);
180 	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_LABEL, tx_queue->label);
181 	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_INSTANCE, tx_queue->queue);
182 	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_OWNER_ID, 0);
183 	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_PORT_ID, efx->vport_id);
184 
185 	dma_addr = tx_queue->txd.buf.dma_addr;
186 
187 	netif_dbg(efx, hw, efx->net_dev, "pushing TXQ %d. %zu entries (%llx)\n",
188 		  tx_queue->queue, entries, (u64)dma_addr);
189 
190 	for (i = 0; i < entries; ++i) {
191 		MCDI_SET_ARRAY_QWORD(inbuf, INIT_TXQ_IN_DMA_ADDR, i, dma_addr);
192 		dma_addr += EFX_BUF_SIZE;
193 	}
194 
195 	inlen = MC_CMD_INIT_TXQ_IN_LEN(entries);
196 
197 	do {
198 		bool tso_v2 = tx_queue->tso_version == 2;
199 
200 		/* TSOv2 implies IP header checksum offload for TSO frames,
201 		 * so we can safely disable IP header checksum offload for
202 		 * everything else.  If we don't have TSOv2, then we have to
203 		 * enable IP header checksum offload, which is strictly
204 		 * incorrect but better than breaking TSO.
205 		 */
206 		MCDI_POPULATE_DWORD_6(inbuf, INIT_TXQ_IN_FLAGS,
207 				/* This flag was removed from mcdi_pcol.h for
208 				 * the non-_EXT version of INIT_TXQ.  However,
209 				 * firmware still honours it.
210 				 */
211 				INIT_TXQ_EXT_IN_FLAG_TSOV2_EN, tso_v2,
212 				INIT_TXQ_IN_FLAG_IP_CSUM_DIS, !(csum_offload && tso_v2),
213 				INIT_TXQ_IN_FLAG_TCP_CSUM_DIS, !csum_offload,
214 				INIT_TXQ_EXT_IN_FLAG_TIMESTAMP, tx_queue->timestamping,
215 				INIT_TXQ_IN_FLAG_INNER_IP_CSUM_EN, inner_csum && !tso_v2,
216 				INIT_TXQ_IN_FLAG_INNER_TCP_CSUM_EN, inner_csum);
217 
218 		rc = efx_mcdi_rpc_quiet(efx, MC_CMD_INIT_TXQ, inbuf, inlen,
219 					NULL, 0, NULL);
220 		if (rc == -ENOSPC && tso_v2) {
221 			/* Retry without TSOv2 if we're short on contexts. */
222 			tx_queue->tso_version = 0;
223 			netif_warn(efx, probe, efx->net_dev,
224 				   "TSOv2 context not available to segment in "
225 				   "hardware. TCP performance may be reduced.\n"
226 				   );
227 		} else if (rc) {
228 			efx_mcdi_display_error(efx, MC_CMD_INIT_TXQ,
229 					       MC_CMD_INIT_TXQ_EXT_IN_LEN,
230 					       NULL, 0, rc);
231 			goto fail;
232 		}
233 	} while (rc);
234 
235 	return 0;
236 
237 fail:
238 	return rc;
239 }
240 
efx_mcdi_tx_remove(struct efx_tx_queue * tx_queue)241 void efx_mcdi_tx_remove(struct efx_tx_queue *tx_queue)
242 {
243 	efx_nic_free_buffer(tx_queue->efx, &tx_queue->txd.buf);
244 }
245 
efx_mcdi_tx_fini(struct efx_tx_queue * tx_queue)246 void efx_mcdi_tx_fini(struct efx_tx_queue *tx_queue)
247 {
248 	MCDI_DECLARE_BUF(inbuf, MC_CMD_FINI_TXQ_IN_LEN);
249 	MCDI_DECLARE_BUF_ERR(outbuf);
250 	struct efx_nic *efx = tx_queue->efx;
251 	size_t outlen;
252 	int rc;
253 
254 	MCDI_SET_DWORD(inbuf, FINI_TXQ_IN_INSTANCE,
255 		       tx_queue->queue);
256 
257 	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FINI_TXQ, inbuf, sizeof(inbuf),
258 				outbuf, sizeof(outbuf), &outlen);
259 
260 	if (rc && rc != -EALREADY)
261 		goto fail;
262 
263 	return;
264 
265 fail:
266 	efx_mcdi_display_error(efx, MC_CMD_FINI_TXQ, MC_CMD_FINI_TXQ_IN_LEN,
267 			       outbuf, outlen, rc);
268 }
269 
efx_mcdi_rx_probe(struct efx_rx_queue * rx_queue)270 int efx_mcdi_rx_probe(struct efx_rx_queue *rx_queue)
271 {
272 	return efx_nic_alloc_buffer(rx_queue->efx, &rx_queue->rxd.buf,
273 				    (rx_queue->ptr_mask + 1) *
274 				    sizeof(efx_qword_t),
275 				    GFP_KERNEL);
276 }
277 
efx_mcdi_rx_init(struct efx_rx_queue * rx_queue)278 void efx_mcdi_rx_init(struct efx_rx_queue *rx_queue)
279 {
280 	struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
281 	size_t entries = rx_queue->rxd.buf.len / EFX_BUF_SIZE;
282 	MCDI_DECLARE_BUF(inbuf, MC_CMD_INIT_RXQ_V4_IN_LEN);
283 	struct efx_nic *efx = rx_queue->efx;
284 	unsigned int buffer_size;
285 	dma_addr_t dma_addr;
286 	int rc;
287 	int i;
288 	BUILD_BUG_ON(MC_CMD_INIT_RXQ_OUT_LEN != 0);
289 
290 	rx_queue->scatter_n = 0;
291 	rx_queue->scatter_len = 0;
292 	if (efx->type->revision == EFX_REV_EF100)
293 		buffer_size = efx->rx_page_buf_step;
294 	else
295 		buffer_size = 0;
296 
297 	MCDI_SET_DWORD(inbuf, INIT_RXQ_IN_SIZE, rx_queue->ptr_mask + 1);
298 	MCDI_SET_DWORD(inbuf, INIT_RXQ_IN_TARGET_EVQ, channel->channel);
299 	MCDI_SET_DWORD(inbuf, INIT_RXQ_IN_LABEL, efx_rx_queue_index(rx_queue));
300 	MCDI_SET_DWORD(inbuf, INIT_RXQ_IN_INSTANCE,
301 		       efx_rx_queue_index(rx_queue));
302 	MCDI_POPULATE_DWORD_2(inbuf, INIT_RXQ_IN_FLAGS,
303 			      INIT_RXQ_IN_FLAG_PREFIX, 1,
304 			      INIT_RXQ_IN_FLAG_TIMESTAMP, 1);
305 	MCDI_SET_DWORD(inbuf, INIT_RXQ_IN_OWNER_ID, 0);
306 	MCDI_SET_DWORD(inbuf, INIT_RXQ_IN_PORT_ID, efx->vport_id);
307 	MCDI_SET_DWORD(inbuf, INIT_RXQ_V4_IN_BUFFER_SIZE_BYTES, buffer_size);
308 
309 	dma_addr = rx_queue->rxd.buf.dma_addr;
310 
311 	netif_dbg(efx, hw, efx->net_dev, "pushing RXQ %d. %zu entries (%llx)\n",
312 		  efx_rx_queue_index(rx_queue), entries, (u64)dma_addr);
313 
314 	for (i = 0; i < entries; ++i) {
315 		MCDI_SET_ARRAY_QWORD(inbuf, INIT_RXQ_IN_DMA_ADDR, i, dma_addr);
316 		dma_addr += EFX_BUF_SIZE;
317 	}
318 
319 	rc = efx_mcdi_rpc(efx, MC_CMD_INIT_RXQ, inbuf, sizeof(inbuf),
320 			  NULL, 0, NULL);
321 	if (rc)
322 		netdev_WARN(efx->net_dev, "failed to initialise RXQ %d\n",
323 			    efx_rx_queue_index(rx_queue));
324 }
325 
efx_mcdi_rx_remove(struct efx_rx_queue * rx_queue)326 void efx_mcdi_rx_remove(struct efx_rx_queue *rx_queue)
327 {
328 	efx_nic_free_buffer(rx_queue->efx, &rx_queue->rxd.buf);
329 }
330 
efx_mcdi_rx_fini(struct efx_rx_queue * rx_queue)331 void efx_mcdi_rx_fini(struct efx_rx_queue *rx_queue)
332 {
333 	MCDI_DECLARE_BUF(inbuf, MC_CMD_FINI_RXQ_IN_LEN);
334 	MCDI_DECLARE_BUF_ERR(outbuf);
335 	struct efx_nic *efx = rx_queue->efx;
336 	size_t outlen;
337 	int rc;
338 
339 	MCDI_SET_DWORD(inbuf, FINI_RXQ_IN_INSTANCE,
340 		       efx_rx_queue_index(rx_queue));
341 
342 	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FINI_RXQ, inbuf, sizeof(inbuf),
343 				outbuf, sizeof(outbuf), &outlen);
344 
345 	if (rc && rc != -EALREADY)
346 		goto fail;
347 
348 	return;
349 
350 fail:
351 	efx_mcdi_display_error(efx, MC_CMD_FINI_RXQ, MC_CMD_FINI_RXQ_IN_LEN,
352 			       outbuf, outlen, rc);
353 }
354 
efx_fini_dmaq(struct efx_nic * efx)355 int efx_fini_dmaq(struct efx_nic *efx)
356 {
357 	struct efx_tx_queue *tx_queue;
358 	struct efx_rx_queue *rx_queue;
359 	struct efx_channel *channel;
360 	int pending;
361 
362 	/* If the MC has just rebooted, the TX/RX queues will have already been
363 	 * torn down, but efx->active_queues needs to be set to zero.
364 	 */
365 	if (efx->must_realloc_vis) {
366 		atomic_set(&efx->active_queues, 0);
367 		return 0;
368 	}
369 
370 	/* Do not attempt to write to the NIC during EEH recovery */
371 	if (efx->state != STATE_RECOVERY) {
372 		efx_for_each_channel(channel, efx) {
373 			efx_for_each_channel_rx_queue(rx_queue, channel)
374 				efx_mcdi_rx_fini(rx_queue);
375 			efx_for_each_channel_tx_queue(tx_queue, channel)
376 				efx_mcdi_tx_fini(tx_queue);
377 		}
378 
379 		wait_event_timeout(efx->flush_wq,
380 				   atomic_read(&efx->active_queues) == 0,
381 				   msecs_to_jiffies(EFX_MAX_FLUSH_TIME));
382 		pending = atomic_read(&efx->active_queues);
383 		if (pending) {
384 			netif_err(efx, hw, efx->net_dev, "failed to flush %d queues\n",
385 				  pending);
386 			return -ETIMEDOUT;
387 		}
388 	}
389 
390 	return 0;
391 }
392 
efx_mcdi_window_mode_to_stride(struct efx_nic * efx,u8 vi_window_mode)393 int efx_mcdi_window_mode_to_stride(struct efx_nic *efx, u8 vi_window_mode)
394 {
395 	switch (vi_window_mode) {
396 	case MC_CMD_GET_CAPABILITIES_V3_OUT_VI_WINDOW_MODE_8K:
397 		efx->vi_stride = 8192;
398 		break;
399 	case MC_CMD_GET_CAPABILITIES_V3_OUT_VI_WINDOW_MODE_16K:
400 		efx->vi_stride = 16384;
401 		break;
402 	case MC_CMD_GET_CAPABILITIES_V3_OUT_VI_WINDOW_MODE_64K:
403 		efx->vi_stride = 65536;
404 		break;
405 	default:
406 		netif_err(efx, probe, efx->net_dev,
407 			  "Unrecognised VI window mode %d\n",
408 			  vi_window_mode);
409 		return -EIO;
410 	}
411 	netif_dbg(efx, probe, efx->net_dev, "vi_stride = %u\n",
412 		  efx->vi_stride);
413 	return 0;
414 }
415 
efx_get_pf_index(struct efx_nic * efx,unsigned int * pf_index)416 int efx_get_pf_index(struct efx_nic *efx, unsigned int *pf_index)
417 {
418 	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_FUNCTION_INFO_OUT_LEN);
419 	size_t outlen;
420 	int rc;
421 
422 	rc = efx_mcdi_rpc(efx, MC_CMD_GET_FUNCTION_INFO, NULL, 0, outbuf,
423 			  sizeof(outbuf), &outlen);
424 	if (rc)
425 		return rc;
426 	if (outlen < sizeof(outbuf))
427 		return -EIO;
428 
429 	*pf_index = MCDI_DWORD(outbuf, GET_FUNCTION_INFO_OUT_PF);
430 	return 0;
431 }
432