1 // SPDX-License-Identifier: GPL-2.0+
2 /* Microchip Sparx5 Switch driver
3 *
4 * Copyright (c) 2021 Microchip Technology Inc. and its subsidiaries.
5 */
6
7 #include "sparx5_main_regs.h"
8 #include "sparx5_main.h"
9
10 #define XTR_EOF_0 ntohl((__force __be32)0x80000000u)
11 #define XTR_EOF_1 ntohl((__force __be32)0x80000001u)
12 #define XTR_EOF_2 ntohl((__force __be32)0x80000002u)
13 #define XTR_EOF_3 ntohl((__force __be32)0x80000003u)
14 #define XTR_PRUNED ntohl((__force __be32)0x80000004u)
15 #define XTR_ABORT ntohl((__force __be32)0x80000005u)
16 #define XTR_ESCAPE ntohl((__force __be32)0x80000006u)
17 #define XTR_NOT_READY ntohl((__force __be32)0x80000007u)
18
19 #define XTR_VALID_BYTES(x) (4 - ((x) & 3))
20
21 #define INJ_TIMEOUT_NS 50000
22
sparx5_xtr_flush(struct sparx5 * sparx5,u8 grp)23 void sparx5_xtr_flush(struct sparx5 *sparx5, u8 grp)
24 {
25 /* Start flush */
26 spx5_wr(QS_XTR_FLUSH_FLUSH_SET(BIT(grp)), sparx5, QS_XTR_FLUSH);
27
28 /* Allow to drain */
29 mdelay(1);
30
31 /* All Queues normal */
32 spx5_wr(0, sparx5, QS_XTR_FLUSH);
33 }
34
sparx5_ifh_parse(u32 * ifh,struct frame_info * info)35 void sparx5_ifh_parse(u32 *ifh, struct frame_info *info)
36 {
37 u8 *xtr_hdr = (u8 *)ifh;
38
39 /* FWD is bit 45-72 (28 bits), but we only read the 27 LSB for now */
40 u32 fwd =
41 ((u32)xtr_hdr[27] << 24) |
42 ((u32)xtr_hdr[28] << 16) |
43 ((u32)xtr_hdr[29] << 8) |
44 ((u32)xtr_hdr[30] << 0);
45 fwd = (fwd >> 5);
46 info->src_port = FIELD_GET(GENMASK(7, 1), fwd);
47 }
48
sparx5_xtr_grp(struct sparx5 * sparx5,u8 grp,bool byte_swap)49 static void sparx5_xtr_grp(struct sparx5 *sparx5, u8 grp, bool byte_swap)
50 {
51 bool eof_flag = false, pruned_flag = false, abort_flag = false;
52 struct net_device *netdev;
53 struct sparx5_port *port;
54 struct frame_info fi;
55 int i, byte_cnt = 0;
56 struct sk_buff *skb;
57 u32 ifh[IFH_LEN];
58 u32 *rxbuf;
59
60 /* Get IFH */
61 for (i = 0; i < IFH_LEN; i++)
62 ifh[i] = spx5_rd(sparx5, QS_XTR_RD(grp));
63
64 /* Decode IFH (whats needed) */
65 sparx5_ifh_parse(ifh, &fi);
66
67 /* Map to port netdev */
68 port = fi.src_port < SPX5_PORTS ?
69 sparx5->ports[fi.src_port] : NULL;
70 if (!port || !port->ndev) {
71 dev_err(sparx5->dev, "Data on inactive port %d\n", fi.src_port);
72 sparx5_xtr_flush(sparx5, grp);
73 return;
74 }
75
76 /* Have netdev, get skb */
77 netdev = port->ndev;
78 skb = netdev_alloc_skb(netdev, netdev->mtu + ETH_HLEN);
79 if (!skb) {
80 sparx5_xtr_flush(sparx5, grp);
81 dev_err(sparx5->dev, "No skb allocated\n");
82 netdev->stats.rx_dropped++;
83 return;
84 }
85 rxbuf = (u32 *)skb->data;
86
87 /* Now, pull frame data */
88 while (!eof_flag) {
89 u32 val = spx5_rd(sparx5, QS_XTR_RD(grp));
90 u32 cmp = val;
91
92 if (byte_swap)
93 cmp = ntohl((__force __be32)val);
94
95 switch (cmp) {
96 case XTR_NOT_READY:
97 break;
98 case XTR_ABORT:
99 /* No accompanying data */
100 abort_flag = true;
101 eof_flag = true;
102 break;
103 case XTR_EOF_0:
104 case XTR_EOF_1:
105 case XTR_EOF_2:
106 case XTR_EOF_3:
107 /* This assumes STATUS_WORD_POS == 1, Status
108 * just after last data
109 */
110 if (!byte_swap)
111 val = ntohl((__force __be32)val);
112 byte_cnt -= (4 - XTR_VALID_BYTES(val));
113 eof_flag = true;
114 break;
115 case XTR_PRUNED:
116 /* But get the last 4 bytes as well */
117 eof_flag = true;
118 pruned_flag = true;
119 fallthrough;
120 case XTR_ESCAPE:
121 *rxbuf = spx5_rd(sparx5, QS_XTR_RD(grp));
122 byte_cnt += 4;
123 rxbuf++;
124 break;
125 default:
126 *rxbuf = val;
127 byte_cnt += 4;
128 rxbuf++;
129 }
130 }
131
132 if (abort_flag || pruned_flag || !eof_flag) {
133 netdev_err(netdev, "Discarded frame: abort:%d pruned:%d eof:%d\n",
134 abort_flag, pruned_flag, eof_flag);
135 kfree_skb(skb);
136 netdev->stats.rx_dropped++;
137 return;
138 }
139
140 /* Everything we see on an interface that is in the HW bridge
141 * has already been forwarded
142 */
143 if (test_bit(port->portno, sparx5->bridge_mask))
144 skb->offload_fwd_mark = 1;
145
146 /* Finish up skb */
147 skb_put(skb, byte_cnt - ETH_FCS_LEN);
148 eth_skb_pad(skb);
149 skb->protocol = eth_type_trans(skb, netdev);
150 netdev->stats.rx_bytes += skb->len;
151 netdev->stats.rx_packets++;
152 netif_rx(skb);
153 }
154
sparx5_inject(struct sparx5 * sparx5,u32 * ifh,struct sk_buff * skb,struct net_device * ndev)155 static int sparx5_inject(struct sparx5 *sparx5,
156 u32 *ifh,
157 struct sk_buff *skb,
158 struct net_device *ndev)
159 {
160 int grp = INJ_QUEUE;
161 u32 val, w, count;
162 u8 *buf;
163
164 val = spx5_rd(sparx5, QS_INJ_STATUS);
165 if (!(QS_INJ_STATUS_FIFO_RDY_GET(val) & BIT(grp))) {
166 pr_err_ratelimited("Injection: Queue not ready: 0x%lx\n",
167 QS_INJ_STATUS_FIFO_RDY_GET(val));
168 return -EBUSY;
169 }
170
171 /* Indicate SOF */
172 spx5_wr(QS_INJ_CTRL_SOF_SET(1) |
173 QS_INJ_CTRL_GAP_SIZE_SET(1),
174 sparx5, QS_INJ_CTRL(grp));
175
176 /* Write the IFH to the chip. */
177 for (w = 0; w < IFH_LEN; w++)
178 spx5_wr(ifh[w], sparx5, QS_INJ_WR(grp));
179
180 /* Write words, round up */
181 count = DIV_ROUND_UP(skb->len, 4);
182 buf = skb->data;
183 for (w = 0; w < count; w++, buf += 4) {
184 val = get_unaligned((const u32 *)buf);
185 spx5_wr(val, sparx5, QS_INJ_WR(grp));
186 }
187
188 /* Add padding */
189 while (w < (60 / 4)) {
190 spx5_wr(0, sparx5, QS_INJ_WR(grp));
191 w++;
192 }
193
194 /* Indicate EOF and valid bytes in last word */
195 spx5_wr(QS_INJ_CTRL_GAP_SIZE_SET(1) |
196 QS_INJ_CTRL_VLD_BYTES_SET(skb->len < 60 ? 0 : skb->len % 4) |
197 QS_INJ_CTRL_EOF_SET(1),
198 sparx5, QS_INJ_CTRL(grp));
199
200 /* Add dummy CRC */
201 spx5_wr(0, sparx5, QS_INJ_WR(grp));
202 w++;
203
204 val = spx5_rd(sparx5, QS_INJ_STATUS);
205 if (QS_INJ_STATUS_WMARK_REACHED_GET(val) & BIT(grp)) {
206 struct sparx5_port *port = netdev_priv(ndev);
207
208 pr_err_ratelimited("Injection: Watermark reached: 0x%lx\n",
209 QS_INJ_STATUS_WMARK_REACHED_GET(val));
210 netif_stop_queue(ndev);
211 hrtimer_start(&port->inj_timer, INJ_TIMEOUT_NS,
212 HRTIMER_MODE_REL);
213 }
214
215 return NETDEV_TX_OK;
216 }
217
sparx5_port_xmit_impl(struct sk_buff * skb,struct net_device * dev)218 int sparx5_port_xmit_impl(struct sk_buff *skb, struct net_device *dev)
219 {
220 struct net_device_stats *stats = &dev->stats;
221 struct sparx5_port *port = netdev_priv(dev);
222 struct sparx5 *sparx5 = port->sparx5;
223 int ret;
224
225 if (sparx5->fdma_irq > 0)
226 ret = sparx5_fdma_xmit(sparx5, port->ifh, skb);
227 else
228 ret = sparx5_inject(sparx5, port->ifh, skb, dev);
229
230 if (ret == NETDEV_TX_OK) {
231 stats->tx_bytes += skb->len;
232 stats->tx_packets++;
233 skb_tx_timestamp(skb);
234 dev_kfree_skb_any(skb);
235 } else {
236 stats->tx_dropped++;
237 }
238 return ret;
239 }
240
sparx5_injection_timeout(struct hrtimer * tmr)241 static enum hrtimer_restart sparx5_injection_timeout(struct hrtimer *tmr)
242 {
243 struct sparx5_port *port = container_of(tmr, struct sparx5_port,
244 inj_timer);
245 int grp = INJ_QUEUE;
246 u32 val;
247
248 val = spx5_rd(port->sparx5, QS_INJ_STATUS);
249 if (QS_INJ_STATUS_WMARK_REACHED_GET(val) & BIT(grp)) {
250 pr_err_ratelimited("Injection: Reset watermark count\n");
251 /* Reset Watermark count to restart */
252 spx5_rmw(DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR_SET(1),
253 DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR,
254 port->sparx5,
255 DSM_DEV_TX_STOP_WM_CFG(port->portno));
256 }
257 netif_wake_queue(port->ndev);
258 return HRTIMER_NORESTART;
259 }
260
sparx5_manual_injection_mode(struct sparx5 * sparx5)261 int sparx5_manual_injection_mode(struct sparx5 *sparx5)
262 {
263 const int byte_swap = 1;
264 int portno;
265
266 /* Change mode to manual extraction and injection */
267 spx5_wr(QS_XTR_GRP_CFG_MODE_SET(1) |
268 QS_XTR_GRP_CFG_STATUS_WORD_POS_SET(1) |
269 QS_XTR_GRP_CFG_BYTE_SWAP_SET(byte_swap),
270 sparx5, QS_XTR_GRP_CFG(XTR_QUEUE));
271 spx5_wr(QS_INJ_GRP_CFG_MODE_SET(1) |
272 QS_INJ_GRP_CFG_BYTE_SWAP_SET(byte_swap),
273 sparx5, QS_INJ_GRP_CFG(INJ_QUEUE));
274
275 /* CPU ports capture setup */
276 for (portno = SPX5_PORT_CPU_0; portno <= SPX5_PORT_CPU_1; portno++) {
277 /* ASM CPU port: No preamble, IFH, enable padding */
278 spx5_wr(ASM_PORT_CFG_PAD_ENA_SET(1) |
279 ASM_PORT_CFG_NO_PREAMBLE_ENA_SET(1) |
280 ASM_PORT_CFG_INJ_FORMAT_CFG_SET(1), /* 1 = IFH */
281 sparx5, ASM_PORT_CFG(portno));
282
283 /* Reset WM cnt to unclog queued frames */
284 spx5_rmw(DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR_SET(1),
285 DSM_DEV_TX_STOP_WM_CFG_DEV_TX_CNT_CLR,
286 sparx5,
287 DSM_DEV_TX_STOP_WM_CFG(portno));
288
289 /* Set Disassembler Stop Watermark level */
290 spx5_rmw(DSM_DEV_TX_STOP_WM_CFG_DEV_TX_STOP_WM_SET(0),
291 DSM_DEV_TX_STOP_WM_CFG_DEV_TX_STOP_WM,
292 sparx5,
293 DSM_DEV_TX_STOP_WM_CFG(portno));
294
295 /* Enable Disassembler buffer underrun watchdog
296 */
297 spx5_rmw(DSM_BUF_CFG_UNDERFLOW_WATCHDOG_DIS_SET(0),
298 DSM_BUF_CFG_UNDERFLOW_WATCHDOG_DIS,
299 sparx5,
300 DSM_BUF_CFG(portno));
301 }
302 return 0;
303 }
304
sparx5_xtr_handler(int irq,void * _sparx5)305 irqreturn_t sparx5_xtr_handler(int irq, void *_sparx5)
306 {
307 struct sparx5 *s5 = _sparx5;
308 int poll = 64;
309
310 /* Check data in queue */
311 while (spx5_rd(s5, QS_XTR_DATA_PRESENT) & BIT(XTR_QUEUE) && poll-- > 0)
312 sparx5_xtr_grp(s5, XTR_QUEUE, false);
313
314 return IRQ_HANDLED;
315 }
316
sparx5_port_inj_timer_setup(struct sparx5_port * port)317 void sparx5_port_inj_timer_setup(struct sparx5_port *port)
318 {
319 hrtimer_init(&port->inj_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
320 port->inj_timer.function = sparx5_injection_timeout;
321 }
322