1 /*******************************************************************************
2 This contains the functions to handle the enhanced descriptors.
3
4 Copyright (C) 2007-2014 STMicroelectronics Ltd
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms and conditions of the GNU General Public License,
8 version 2, as published by the Free Software Foundation.
9
10 This program is distributed in the hope it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 more details.
14
15 You should have received a copy of the GNU General Public License along with
16 this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
21
22 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
23 *******************************************************************************/
24
25 #include <linux/stmmac.h>
26 #include "common.h"
27 #include "descs_com.h"
28
enh_desc_get_tx_status(void * data,struct stmmac_extra_stats * x,struct dma_desc * p,void __iomem * ioaddr)29 static int enh_desc_get_tx_status(void *data, struct stmmac_extra_stats *x,
30 struct dma_desc *p, void __iomem *ioaddr)
31 {
32 struct net_device_stats *stats = (struct net_device_stats *)data;
33 unsigned int tdes0 = p->des0;
34 int ret = tx_done;
35
36 /* Get tx owner first */
37 if (unlikely(tdes0 & ETDES0_OWN))
38 return tx_dma_own;
39
40 /* Verify tx error by looking at the last segment. */
41 if (likely(!(tdes0 & ETDES0_LAST_SEGMENT)))
42 return tx_not_ls;
43
44 if (unlikely(tdes0 & ETDES0_ERROR_SUMMARY)) {
45 if (unlikely(tdes0 & ETDES0_JABBER_TIMEOUT))
46 x->tx_jabber++;
47
48 if (unlikely(tdes0 & ETDES0_FRAME_FLUSHED)) {
49 x->tx_frame_flushed++;
50 dwmac_dma_flush_tx_fifo(ioaddr);
51 }
52
53 if (unlikely(tdes0 & ETDES0_LOSS_CARRIER)) {
54 x->tx_losscarrier++;
55 stats->tx_carrier_errors++;
56 }
57 if (unlikely(tdes0 & ETDES0_NO_CARRIER)) {
58 x->tx_carrier++;
59 stats->tx_carrier_errors++;
60 }
61 if (unlikely((tdes0 & ETDES0_LATE_COLLISION) ||
62 (tdes0 & ETDES0_EXCESSIVE_COLLISIONS)))
63 stats->collisions +=
64 (tdes0 & ETDES0_COLLISION_COUNT_MASK) >> 3;
65
66 if (unlikely(tdes0 & ETDES0_EXCESSIVE_DEFERRAL))
67 x->tx_deferred++;
68
69 if (unlikely(tdes0 & ETDES0_UNDERFLOW_ERROR)) {
70 dwmac_dma_flush_tx_fifo(ioaddr);
71 x->tx_underflow++;
72 }
73
74 if (unlikely(tdes0 & ETDES0_IP_HEADER_ERROR))
75 x->tx_ip_header_error++;
76
77 if (unlikely(tdes0 & ETDES0_PAYLOAD_ERROR)) {
78 x->tx_payload_error++;
79 dwmac_dma_flush_tx_fifo(ioaddr);
80 }
81
82 ret = tx_err;
83 }
84
85 if (unlikely(tdes0 & ETDES0_DEFERRED))
86 x->tx_deferred++;
87
88 #ifdef STMMAC_VLAN_TAG_USED
89 if (tdes0 & ETDES0_VLAN_FRAME)
90 x->tx_vlan++;
91 #endif
92
93 return ret;
94 }
95
enh_desc_get_tx_len(struct dma_desc * p)96 static int enh_desc_get_tx_len(struct dma_desc *p)
97 {
98 return (p->des1 & ETDES1_BUFFER1_SIZE_MASK);
99 }
100
enh_desc_coe_rdes0(int ipc_err,int type,int payload_err)101 static int enh_desc_coe_rdes0(int ipc_err, int type, int payload_err)
102 {
103 int ret = good_frame;
104 u32 status = (type << 2 | ipc_err << 1 | payload_err) & 0x7;
105
106 /* bits 5 7 0 | Frame status
107 * ----------------------------------------------------------
108 * 0 0 0 | IEEE 802.3 Type frame (length < 1536 octects)
109 * 1 0 0 | IPv4/6 No CSUM errorS.
110 * 1 0 1 | IPv4/6 CSUM PAYLOAD error
111 * 1 1 0 | IPv4/6 CSUM IP HR error
112 * 1 1 1 | IPv4/6 IP PAYLOAD AND HEADER errorS
113 * 0 0 1 | IPv4/6 unsupported IP PAYLOAD
114 * 0 1 1 | COE bypassed.. no IPv4/6 frame
115 * 0 1 0 | Reserved.
116 */
117 if (status == 0x0)
118 ret = llc_snap;
119 else if (status == 0x4)
120 ret = good_frame;
121 else if (status == 0x5)
122 ret = csum_none;
123 else if (status == 0x6)
124 ret = csum_none;
125 else if (status == 0x7)
126 ret = csum_none;
127 else if (status == 0x1)
128 ret = discard_frame;
129 else if (status == 0x3)
130 ret = discard_frame;
131 return ret;
132 }
133
enh_desc_get_ext_status(void * data,struct stmmac_extra_stats * x,struct dma_extended_desc * p)134 static void enh_desc_get_ext_status(void *data, struct stmmac_extra_stats *x,
135 struct dma_extended_desc *p)
136 {
137 unsigned int rdes0 = p->basic.des0;
138 unsigned int rdes4 = p->des4;
139
140 if (unlikely(rdes0 & ERDES0_RX_MAC_ADDR)) {
141 int message_type = (rdes4 & ERDES4_MSG_TYPE_MASK) >> 8;
142
143 if (rdes4 & ERDES4_IP_HDR_ERR)
144 x->ip_hdr_err++;
145 if (rdes4 & ERDES4_IP_PAYLOAD_ERR)
146 x->ip_payload_err++;
147 if (rdes4 & ERDES4_IP_CSUM_BYPASSED)
148 x->ip_csum_bypassed++;
149 if (rdes4 & ERDES4_IPV4_PKT_RCVD)
150 x->ipv4_pkt_rcvd++;
151 if (rdes4 & ERDES4_IPV6_PKT_RCVD)
152 x->ipv6_pkt_rcvd++;
153
154 if (message_type == RDES_EXT_NO_PTP)
155 x->no_ptp_rx_msg_type_ext++;
156 else if (message_type == RDES_EXT_SYNC)
157 x->ptp_rx_msg_type_sync++;
158 else if (message_type == RDES_EXT_FOLLOW_UP)
159 x->ptp_rx_msg_type_follow_up++;
160 else if (message_type == RDES_EXT_DELAY_REQ)
161 x->ptp_rx_msg_type_delay_req++;
162 else if (message_type == RDES_EXT_DELAY_RESP)
163 x->ptp_rx_msg_type_delay_resp++;
164 else if (message_type == RDES_EXT_PDELAY_REQ)
165 x->ptp_rx_msg_type_pdelay_req++;
166 else if (message_type == RDES_EXT_PDELAY_RESP)
167 x->ptp_rx_msg_type_pdelay_resp++;
168 else if (message_type == RDES_EXT_PDELAY_FOLLOW_UP)
169 x->ptp_rx_msg_type_pdelay_follow_up++;
170 else if (message_type == RDES_PTP_ANNOUNCE)
171 x->ptp_rx_msg_type_announce++;
172 else if (message_type == RDES_PTP_MANAGEMENT)
173 x->ptp_rx_msg_type_management++;
174 else if (message_type == RDES_PTP_PKT_RESERVED_TYPE)
175 x->ptp_rx_msg_pkt_reserved_type++;
176
177 if (rdes4 & ERDES4_PTP_FRAME_TYPE)
178 x->ptp_frame_type++;
179 if (rdes4 & ERDES4_PTP_VER)
180 x->ptp_ver++;
181 if (rdes4 & ERDES4_TIMESTAMP_DROPPED)
182 x->timestamp_dropped++;
183 if (rdes4 & ERDES4_AV_PKT_RCVD)
184 x->av_pkt_rcvd++;
185 if (rdes4 & ERDES4_AV_TAGGED_PKT_RCVD)
186 x->av_tagged_pkt_rcvd++;
187 if ((rdes4 & ERDES4_VLAN_TAG_PRI_VAL_MASK) >> 18)
188 x->vlan_tag_priority_val++;
189 if (rdes4 & ERDES4_L3_FILTER_MATCH)
190 x->l3_filter_match++;
191 if (rdes4 & ERDES4_L4_FILTER_MATCH)
192 x->l4_filter_match++;
193 if ((rdes4 & ERDES4_L3_L4_FILT_NO_MATCH_MASK) >> 26)
194 x->l3_l4_filter_no_match++;
195 }
196 }
197
enh_desc_get_rx_status(void * data,struct stmmac_extra_stats * x,struct dma_desc * p)198 static int enh_desc_get_rx_status(void *data, struct stmmac_extra_stats *x,
199 struct dma_desc *p)
200 {
201 struct net_device_stats *stats = (struct net_device_stats *)data;
202 unsigned int rdes0 = p->des0;
203 int ret = good_frame;
204
205 if (unlikely(rdes0 & RDES0_OWN))
206 return dma_own;
207
208 if (unlikely(rdes0 & RDES0_ERROR_SUMMARY)) {
209 if (unlikely(rdes0 & RDES0_DESCRIPTOR_ERROR)) {
210 x->rx_desc++;
211 stats->rx_length_errors++;
212 }
213 if (unlikely(rdes0 & RDES0_OVERFLOW_ERROR))
214 x->rx_gmac_overflow++;
215
216 if (unlikely(rdes0 & RDES0_IPC_CSUM_ERROR))
217 pr_err("\tIPC Csum Error/Giant frame\n");
218
219 if (unlikely(rdes0 & RDES0_COLLISION))
220 stats->collisions++;
221 if (unlikely(rdes0 & RDES0_RECEIVE_WATCHDOG))
222 x->rx_watchdog++;
223
224 if (unlikely(rdes0 & RDES0_MII_ERROR)) /* GMII */
225 x->rx_mii++;
226
227 if (unlikely(rdes0 & RDES0_CRC_ERROR)) {
228 x->rx_crc++;
229 stats->rx_crc_errors++;
230 }
231 ret = discard_frame;
232 }
233
234 /* After a payload csum error, the ES bit is set.
235 * It doesn't match with the information reported into the databook.
236 * At any rate, we need to understand if the CSUM hw computation is ok
237 * and report this info to the upper layers. */
238 ret = enh_desc_coe_rdes0(!!(rdes0 & RDES0_IPC_CSUM_ERROR),
239 !!(rdes0 & RDES0_FRAME_TYPE),
240 !!(rdes0 & ERDES0_RX_MAC_ADDR));
241
242 if (unlikely(rdes0 & RDES0_DRIBBLING))
243 x->dribbling_bit++;
244
245 if (unlikely(rdes0 & RDES0_SA_FILTER_FAIL)) {
246 x->sa_rx_filter_fail++;
247 ret = discard_frame;
248 }
249 if (unlikely(rdes0 & RDES0_DA_FILTER_FAIL)) {
250 x->da_rx_filter_fail++;
251 ret = discard_frame;
252 }
253 if (unlikely(rdes0 & RDES0_LENGTH_ERROR)) {
254 x->rx_length++;
255 ret = discard_frame;
256 }
257 #ifdef STMMAC_VLAN_TAG_USED
258 if (rdes0 & RDES0_VLAN_TAG)
259 x->rx_vlan++;
260 #endif
261
262 return ret;
263 }
264
enh_desc_init_rx_desc(struct dma_desc * p,int disable_rx_ic,int mode,int end)265 static void enh_desc_init_rx_desc(struct dma_desc *p, int disable_rx_ic,
266 int mode, int end)
267 {
268 p->des0 |= RDES0_OWN;
269 p->des1 |= ((BUF_SIZE_8KiB - 1) & ERDES1_BUFFER1_SIZE_MASK);
270
271 if (mode == STMMAC_CHAIN_MODE)
272 ehn_desc_rx_set_on_chain(p);
273 else
274 ehn_desc_rx_set_on_ring(p, end);
275
276 if (disable_rx_ic)
277 p->des1 |= ERDES1_DISABLE_IC;
278 }
279
enh_desc_init_tx_desc(struct dma_desc * p,int mode,int end)280 static void enh_desc_init_tx_desc(struct dma_desc *p, int mode, int end)
281 {
282 p->des0 &= ~ETDES0_OWN;
283 if (mode == STMMAC_CHAIN_MODE)
284 enh_desc_end_tx_desc_on_chain(p);
285 else
286 enh_desc_end_tx_desc_on_ring(p, end);
287 }
288
enh_desc_get_tx_owner(struct dma_desc * p)289 static int enh_desc_get_tx_owner(struct dma_desc *p)
290 {
291 return (p->des0 & ETDES0_OWN) >> 31;
292 }
293
enh_desc_set_tx_owner(struct dma_desc * p)294 static void enh_desc_set_tx_owner(struct dma_desc *p)
295 {
296 p->des0 |= ETDES0_OWN;
297 }
298
enh_desc_set_rx_owner(struct dma_desc * p)299 static void enh_desc_set_rx_owner(struct dma_desc *p)
300 {
301 p->des0 |= RDES0_OWN;
302 }
303
enh_desc_get_tx_ls(struct dma_desc * p)304 static int enh_desc_get_tx_ls(struct dma_desc *p)
305 {
306 return (p->des0 & ETDES0_LAST_SEGMENT) >> 29;
307 }
308
enh_desc_release_tx_desc(struct dma_desc * p,int mode)309 static void enh_desc_release_tx_desc(struct dma_desc *p, int mode)
310 {
311 int ter = (p->des0 & ETDES0_END_RING) >> 21;
312
313 memset(p, 0, offsetof(struct dma_desc, des2));
314 if (mode == STMMAC_CHAIN_MODE)
315 enh_desc_end_tx_desc_on_chain(p);
316 else
317 enh_desc_end_tx_desc_on_ring(p, ter);
318 }
319
enh_desc_prepare_tx_desc(struct dma_desc * p,int is_fs,int len,bool csum_flag,int mode,bool tx_own,bool ls)320 static void enh_desc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
321 bool csum_flag, int mode, bool tx_own,
322 bool ls)
323 {
324 unsigned int tdes0 = p->des0;
325
326 if (mode == STMMAC_CHAIN_MODE)
327 enh_set_tx_desc_len_on_chain(p, len);
328 else
329 enh_set_tx_desc_len_on_ring(p, len);
330
331 if (is_fs)
332 tdes0 |= ETDES0_FIRST_SEGMENT;
333 else
334 tdes0 &= ~ETDES0_FIRST_SEGMENT;
335
336 if (likely(csum_flag))
337 tdes0 |= (TX_CIC_FULL << ETDES0_CHECKSUM_INSERTION_SHIFT);
338 else
339 tdes0 &= ~(TX_CIC_FULL << ETDES0_CHECKSUM_INSERTION_SHIFT);
340
341 if (ls)
342 tdes0 |= ETDES0_LAST_SEGMENT;
343
344 /* Finally set the OWN bit. Later the DMA will start! */
345 if (tx_own)
346 tdes0 |= ETDES0_OWN;
347
348 if (is_fs & tx_own)
349 /* When the own bit, for the first frame, has to be set, all
350 * descriptors for the same frame has to be set before, to
351 * avoid race condition.
352 */
353 wmb();
354
355 p->des0 = tdes0;
356 }
357
enh_desc_set_tx_ic(struct dma_desc * p)358 static void enh_desc_set_tx_ic(struct dma_desc *p)
359 {
360 p->des0 |= ETDES0_INTERRUPT;
361 }
362
enh_desc_get_rx_frame_len(struct dma_desc * p,int rx_coe_type)363 static int enh_desc_get_rx_frame_len(struct dma_desc *p, int rx_coe_type)
364 {
365 unsigned int csum = 0;
366 /* The type-1 checksum offload engines append the checksum at
367 * the end of frame and the two bytes of checksum are added in
368 * the length.
369 * Adjust for that in the framelen for type-1 checksum offload
370 * engines.
371 */
372 if (rx_coe_type == STMMAC_RX_COE_TYPE1)
373 csum = 2;
374
375 return (((p->des0 & RDES0_FRAME_LEN_MASK) >> RDES0_FRAME_LEN_SHIFT) -
376 csum);
377 }
378
enh_desc_enable_tx_timestamp(struct dma_desc * p)379 static void enh_desc_enable_tx_timestamp(struct dma_desc *p)
380 {
381 p->des0 |= ETDES0_TIME_STAMP_ENABLE;
382 }
383
enh_desc_get_tx_timestamp_status(struct dma_desc * p)384 static int enh_desc_get_tx_timestamp_status(struct dma_desc *p)
385 {
386 return (p->des0 & ETDES0_TIME_STAMP_STATUS) >> 17;
387 }
388
enh_desc_get_timestamp(void * desc,u32 ats)389 static u64 enh_desc_get_timestamp(void *desc, u32 ats)
390 {
391 u64 ns;
392
393 if (ats) {
394 struct dma_extended_desc *p = (struct dma_extended_desc *)desc;
395 ns = p->des6;
396 /* convert high/sec time stamp value to nanosecond */
397 ns += p->des7 * 1000000000ULL;
398 } else {
399 struct dma_desc *p = (struct dma_desc *)desc;
400 ns = p->des2;
401 ns += p->des3 * 1000000000ULL;
402 }
403
404 return ns;
405 }
406
enh_desc_get_rx_timestamp_status(void * desc,u32 ats)407 static int enh_desc_get_rx_timestamp_status(void *desc, u32 ats)
408 {
409 if (ats) {
410 struct dma_extended_desc *p = (struct dma_extended_desc *)desc;
411 return (p->basic.des0 & RDES0_IPC_CSUM_ERROR) >> 7;
412 } else {
413 struct dma_desc *p = (struct dma_desc *)desc;
414 if ((p->des2 == 0xffffffff) && (p->des3 == 0xffffffff))
415 /* timestamp is corrupted, hence don't store it */
416 return 0;
417 else
418 return 1;
419 }
420 }
421
enh_desc_display_ring(void * head,unsigned int size,bool rx)422 static void enh_desc_display_ring(void *head, unsigned int size, bool rx)
423 {
424 struct dma_extended_desc *ep = (struct dma_extended_desc *)head;
425 int i;
426
427 pr_info("Extended %s descriptor ring:\n", rx ? "RX" : "TX");
428
429 for (i = 0; i < size; i++) {
430 u64 x;
431
432 x = *(u64 *)ep;
433 pr_info("%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
434 i, (unsigned int)virt_to_phys(ep),
435 (unsigned int)x, (unsigned int)(x >> 32),
436 ep->basic.des2, ep->basic.des3);
437 ep++;
438 }
439 pr_info("\n");
440 }
441
442 const struct stmmac_desc_ops enh_desc_ops = {
443 .tx_status = enh_desc_get_tx_status,
444 .rx_status = enh_desc_get_rx_status,
445 .get_tx_len = enh_desc_get_tx_len,
446 .init_rx_desc = enh_desc_init_rx_desc,
447 .init_tx_desc = enh_desc_init_tx_desc,
448 .get_tx_owner = enh_desc_get_tx_owner,
449 .release_tx_desc = enh_desc_release_tx_desc,
450 .prepare_tx_desc = enh_desc_prepare_tx_desc,
451 .set_tx_ic = enh_desc_set_tx_ic,
452 .get_tx_ls = enh_desc_get_tx_ls,
453 .set_tx_owner = enh_desc_set_tx_owner,
454 .set_rx_owner = enh_desc_set_rx_owner,
455 .get_rx_frame_len = enh_desc_get_rx_frame_len,
456 .rx_extended_status = enh_desc_get_ext_status,
457 .enable_tx_timestamp = enh_desc_enable_tx_timestamp,
458 .get_tx_timestamp_status = enh_desc_get_tx_timestamp_status,
459 .get_timestamp = enh_desc_get_timestamp,
460 .get_rx_timestamp_status = enh_desc_get_rx_timestamp_status,
461 .display_ring = enh_desc_display_ring,
462 };
463