1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2013-2016, The Linux Foundation. All rights reserved. 3 */ 4 5 /* Qualcomm Technologies, Inc. EMAC Ethernet Controller MAC layer support 6 */ 7 8 #include <linux/tcp.h> 9 #include <linux/ip.h> 10 #include <linux/ipv6.h> 11 #include <linux/crc32.h> 12 #include <linux/if_vlan.h> 13 #include <linux/jiffies.h> 14 #include <linux/phy.h> 15 #include <linux/of.h> 16 #include <net/ip6_checksum.h> 17 #include "emac.h" 18 #include "emac-sgmii.h" 19 20 /* EMAC_MAC_CTRL */ 21 #define SINGLE_PAUSE_MODE 0x10000000 22 #define DEBUG_MODE 0x08000000 23 #define BROAD_EN 0x04000000 24 #define MULTI_ALL 0x02000000 25 #define RX_CHKSUM_EN 0x01000000 26 #define HUGE 0x00800000 27 #define SPEED(x) (((x) & 0x3) << 20) 28 #define SPEED_MASK SPEED(0x3) 29 #define SIMR 0x00080000 30 #define TPAUSE 0x00010000 31 #define PROM_MODE 0x00008000 32 #define VLAN_STRIP 0x00004000 33 #define PRLEN_BMSK 0x00003c00 34 #define PRLEN_SHFT 10 35 #define HUGEN 0x00000200 36 #define FLCHK 0x00000100 37 #define PCRCE 0x00000080 38 #define CRCE 0x00000040 39 #define FULLD 0x00000020 40 #define MAC_LP_EN 0x00000010 41 #define RXFC 0x00000008 42 #define TXFC 0x00000004 43 #define RXEN 0x00000002 44 #define TXEN 0x00000001 45 46 /* EMAC_DESC_CTRL_3 */ 47 #define RFD_RING_SIZE_BMSK 0xfff 48 49 /* EMAC_DESC_CTRL_4 */ 50 #define RX_BUFFER_SIZE_BMSK 0xffff 51 52 /* EMAC_DESC_CTRL_6 */ 53 #define RRD_RING_SIZE_BMSK 0xfff 54 55 /* EMAC_DESC_CTRL_9 */ 56 #define TPD_RING_SIZE_BMSK 0xffff 57 58 /* EMAC_TXQ_CTRL_0 */ 59 #define NUM_TXF_BURST_PREF_BMSK 0xffff0000 60 #define NUM_TXF_BURST_PREF_SHFT 16 61 #define LS_8023_SP 0x80 62 #define TXQ_MODE 0x40 63 #define TXQ_EN 0x20 64 #define IP_OP_SP 0x10 65 #define NUM_TPD_BURST_PREF_BMSK 0xf 66 #define NUM_TPD_BURST_PREF_SHFT 0 67 68 /* EMAC_TXQ_CTRL_1 */ 69 #define JUMBO_TASK_OFFLOAD_THRESHOLD_BMSK 0x7ff 70 71 /* EMAC_TXQ_CTRL_2 */ 72 #define TXF_HWM_BMSK 0xfff0000 73 #define TXF_LWM_BMSK 0xfff 74 75 /* EMAC_RXQ_CTRL_0 */ 76 #define RXQ_EN BIT(31) 77 #define CUT_THRU_EN BIT(30) 78 #define RSS_HASH_EN BIT(29) 79 #define NUM_RFD_BURST_PREF_BMSK 0x3f00000 80 #define NUM_RFD_BURST_PREF_SHFT 20 81 #define IDT_TABLE_SIZE_BMSK 0x1ff00 82 #define IDT_TABLE_SIZE_SHFT 8 83 #define SP_IPV6 0x80 84 85 /* EMAC_RXQ_CTRL_1 */ 86 #define JUMBO_1KAH_BMSK 0xf000 87 #define JUMBO_1KAH_SHFT 12 88 #define RFD_PREF_LOW_TH 0x10 89 #define RFD_PREF_LOW_THRESHOLD_BMSK 0xfc0 90 #define RFD_PREF_LOW_THRESHOLD_SHFT 6 91 #define RFD_PREF_UP_TH 0x10 92 #define RFD_PREF_UP_THRESHOLD_BMSK 0x3f 93 #define RFD_PREF_UP_THRESHOLD_SHFT 0 94 95 /* EMAC_RXQ_CTRL_2 */ 96 #define RXF_DOF_THRESFHOLD 0x1a0 97 #define RXF_DOF_THRESHOLD_BMSK 0xfff0000 98 #define RXF_DOF_THRESHOLD_SHFT 16 99 #define RXF_UOF_THRESFHOLD 0xbe 100 #define RXF_UOF_THRESHOLD_BMSK 0xfff 101 #define RXF_UOF_THRESHOLD_SHFT 0 102 103 /* EMAC_RXQ_CTRL_3 */ 104 #define RXD_TIMER_BMSK 0xffff0000 105 #define RXD_THRESHOLD_BMSK 0xfff 106 #define RXD_THRESHOLD_SHFT 0 107 108 /* EMAC_DMA_CTRL */ 109 #define DMAW_DLY_CNT_BMSK 0xf0000 110 #define DMAW_DLY_CNT_SHFT 16 111 #define DMAR_DLY_CNT_BMSK 0xf800 112 #define DMAR_DLY_CNT_SHFT 11 113 #define DMAR_REQ_PRI 0x400 114 #define REGWRBLEN_BMSK 0x380 115 #define REGWRBLEN_SHFT 7 116 #define REGRDBLEN_BMSK 0x70 117 #define REGRDBLEN_SHFT 4 118 #define OUT_ORDER_MODE 0x4 119 #define ENH_ORDER_MODE 0x2 120 #define IN_ORDER_MODE 0x1 121 122 /* EMAC_MAILBOX_13 */ 123 #define RFD3_PROC_IDX_BMSK 0xfff0000 124 #define RFD3_PROC_IDX_SHFT 16 125 #define RFD3_PROD_IDX_BMSK 0xfff 126 #define RFD3_PROD_IDX_SHFT 0 127 128 /* EMAC_MAILBOX_2 */ 129 #define NTPD_CONS_IDX_BMSK 0xffff0000 130 #define NTPD_CONS_IDX_SHFT 16 131 132 /* EMAC_MAILBOX_3 */ 133 #define RFD0_CONS_IDX_BMSK 0xfff 134 #define RFD0_CONS_IDX_SHFT 0 135 136 /* EMAC_MAILBOX_11 */ 137 #define H3TPD_PROD_IDX_BMSK 0xffff0000 138 #define H3TPD_PROD_IDX_SHFT 16 139 140 /* EMAC_AXI_MAST_CTRL */ 141 #define DATA_BYTE_SWAP 0x8 142 #define MAX_BOUND 0x2 143 #define MAX_BTYPE 0x1 144 145 /* EMAC_MAILBOX_12 */ 146 #define H3TPD_CONS_IDX_BMSK 0xffff0000 147 #define H3TPD_CONS_IDX_SHFT 16 148 149 /* EMAC_MAILBOX_9 */ 150 #define H2TPD_PROD_IDX_BMSK 0xffff 151 #define H2TPD_PROD_IDX_SHFT 0 152 153 /* EMAC_MAILBOX_10 */ 154 #define H1TPD_CONS_IDX_BMSK 0xffff0000 155 #define H1TPD_CONS_IDX_SHFT 16 156 #define H2TPD_CONS_IDX_BMSK 0xffff 157 #define H2TPD_CONS_IDX_SHFT 0 158 159 /* EMAC_ATHR_HEADER_CTRL */ 160 #define HEADER_CNT_EN 0x2 161 #define HEADER_ENABLE 0x1 162 163 /* EMAC_MAILBOX_0 */ 164 #define RFD0_PROC_IDX_BMSK 0xfff0000 165 #define RFD0_PROC_IDX_SHFT 16 166 #define RFD0_PROD_IDX_BMSK 0xfff 167 #define RFD0_PROD_IDX_SHFT 0 168 169 /* EMAC_MAILBOX_5 */ 170 #define RFD1_PROC_IDX_BMSK 0xfff0000 171 #define RFD1_PROC_IDX_SHFT 16 172 #define RFD1_PROD_IDX_BMSK 0xfff 173 #define RFD1_PROD_IDX_SHFT 0 174 175 /* EMAC_MISC_CTRL */ 176 #define RX_UNCPL_INT_EN 0x1 177 178 /* EMAC_MAILBOX_7 */ 179 #define RFD2_CONS_IDX_BMSK 0xfff0000 180 #define RFD2_CONS_IDX_SHFT 16 181 #define RFD1_CONS_IDX_BMSK 0xfff 182 #define RFD1_CONS_IDX_SHFT 0 183 184 /* EMAC_MAILBOX_8 */ 185 #define RFD3_CONS_IDX_BMSK 0xfff 186 #define RFD3_CONS_IDX_SHFT 0 187 188 /* EMAC_MAILBOX_15 */ 189 #define NTPD_PROD_IDX_BMSK 0xffff 190 #define NTPD_PROD_IDX_SHFT 0 191 192 /* EMAC_MAILBOX_16 */ 193 #define H1TPD_PROD_IDX_BMSK 0xffff 194 #define H1TPD_PROD_IDX_SHFT 0 195 196 #define RXQ0_RSS_HSTYP_IPV6_TCP_EN 0x20 197 #define RXQ0_RSS_HSTYP_IPV6_EN 0x10 198 #define RXQ0_RSS_HSTYP_IPV4_TCP_EN 0x8 199 #define RXQ0_RSS_HSTYP_IPV4_EN 0x4 200 201 /* EMAC_EMAC_WRAPPER_TX_TS_INX */ 202 #define EMAC_WRAPPER_TX_TS_EMPTY BIT(31) 203 #define EMAC_WRAPPER_TX_TS_INX_BMSK 0xffff 204 205 struct emac_skb_cb { 206 u32 tpd_idx; 207 unsigned long jiffies; 208 }; 209 210 #define EMAC_SKB_CB(skb) ((struct emac_skb_cb *)(skb)->cb) 211 #define EMAC_RSS_IDT_SIZE 256 212 #define JUMBO_1KAH 0x4 213 #define RXD_TH 0x100 214 #define EMAC_TPD_LAST_FRAGMENT 0x80000000 215 #define EMAC_TPD_TSTAMP_SAVE 0x80000000 216 217 /* EMAC Errors in emac_rrd.word[3] */ 218 #define EMAC_RRD_L4F BIT(14) 219 #define EMAC_RRD_IPF BIT(15) 220 #define EMAC_RRD_CRC BIT(21) 221 #define EMAC_RRD_FAE BIT(22) 222 #define EMAC_RRD_TRN BIT(23) 223 #define EMAC_RRD_RNT BIT(24) 224 #define EMAC_RRD_INC BIT(25) 225 #define EMAC_RRD_FOV BIT(29) 226 #define EMAC_RRD_LEN BIT(30) 227 228 /* Error bits that will result in a received frame being discarded */ 229 #define EMAC_RRD_ERROR (EMAC_RRD_IPF | EMAC_RRD_CRC | EMAC_RRD_FAE | \ 230 EMAC_RRD_TRN | EMAC_RRD_RNT | EMAC_RRD_INC | \ 231 EMAC_RRD_FOV | EMAC_RRD_LEN) 232 #define EMAC_RRD_STATS_DW_IDX 3 233 234 #define EMAC_RRD(RXQ, SIZE, IDX) ((RXQ)->rrd.v_addr + (SIZE * (IDX))) 235 #define EMAC_RFD(RXQ, SIZE, IDX) ((RXQ)->rfd.v_addr + (SIZE * (IDX))) 236 #define EMAC_TPD(TXQ, SIZE, IDX) ((TXQ)->tpd.v_addr + (SIZE * (IDX))) 237 238 #define GET_RFD_BUFFER(RXQ, IDX) (&((RXQ)->rfd.rfbuff[(IDX)])) 239 #define GET_TPD_BUFFER(RTQ, IDX) (&((RTQ)->tpd.tpbuff[(IDX)])) 240 241 #define EMAC_TX_POLL_HWTXTSTAMP_THRESHOLD 8 242 243 #define ISR_RX_PKT (\ 244 RX_PKT_INT0 |\ 245 RX_PKT_INT1 |\ 246 RX_PKT_INT2 |\ 247 RX_PKT_INT3) 248 249 void emac_mac_multicast_addr_set(struct emac_adapter *adpt, u8 *addr) 250 { 251 u32 crc32, bit, reg, mta; 252 253 /* Calculate the CRC of the MAC address */ 254 crc32 = ether_crc(ETH_ALEN, addr); 255 256 /* The HASH Table is an array of 2 32-bit registers. It is 257 * treated like an array of 64 bits (BitArray[hash_value]). 258 * Use the upper 6 bits of the above CRC as the hash value. 259 */ 260 reg = (crc32 >> 31) & 0x1; 261 bit = (crc32 >> 26) & 0x1F; 262 263 mta = readl(adpt->base + EMAC_HASH_TAB_REG0 + (reg << 2)); 264 mta |= BIT(bit); 265 writel(mta, adpt->base + EMAC_HASH_TAB_REG0 + (reg << 2)); 266 } 267 268 void emac_mac_multicast_addr_clear(struct emac_adapter *adpt) 269 { 270 writel(0, adpt->base + EMAC_HASH_TAB_REG0); 271 writel(0, adpt->base + EMAC_HASH_TAB_REG1); 272 } 273 274 /* definitions for RSS */ 275 #define EMAC_RSS_KEY(_i, _type) \ 276 (EMAC_RSS_KEY0 + ((_i) * sizeof(_type))) 277 #define EMAC_RSS_TBL(_i, _type) \ 278 (EMAC_IDT_TABLE0 + ((_i) * sizeof(_type))) 279 280 /* Config MAC modes */ 281 void emac_mac_mode_config(struct emac_adapter *adpt) 282 { 283 struct net_device *netdev = adpt->netdev; 284 u32 mac; 285 286 mac = readl(adpt->base + EMAC_MAC_CTRL); 287 mac &= ~(VLAN_STRIP | PROM_MODE | MULTI_ALL | MAC_LP_EN); 288 289 if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX) 290 mac |= VLAN_STRIP; 291 292 if (netdev->flags & IFF_PROMISC) 293 mac |= PROM_MODE; 294 295 if (netdev->flags & IFF_ALLMULTI) 296 mac |= MULTI_ALL; 297 298 writel(mac, adpt->base + EMAC_MAC_CTRL); 299 } 300 301 /* Config descriptor rings */ 302 static void emac_mac_dma_rings_config(struct emac_adapter *adpt) 303 { 304 /* TPD (Transmit Packet Descriptor) */ 305 writel(upper_32_bits(adpt->tx_q.tpd.dma_addr), 306 adpt->base + EMAC_DESC_CTRL_1); 307 308 writel(lower_32_bits(adpt->tx_q.tpd.dma_addr), 309 adpt->base + EMAC_DESC_CTRL_8); 310 311 writel(adpt->tx_q.tpd.count & TPD_RING_SIZE_BMSK, 312 adpt->base + EMAC_DESC_CTRL_9); 313 314 /* RFD (Receive Free Descriptor) & RRD (Receive Return Descriptor) */ 315 writel(upper_32_bits(adpt->rx_q.rfd.dma_addr), 316 adpt->base + EMAC_DESC_CTRL_0); 317 318 writel(lower_32_bits(adpt->rx_q.rfd.dma_addr), 319 adpt->base + EMAC_DESC_CTRL_2); 320 writel(lower_32_bits(adpt->rx_q.rrd.dma_addr), 321 adpt->base + EMAC_DESC_CTRL_5); 322 323 writel(adpt->rx_q.rfd.count & RFD_RING_SIZE_BMSK, 324 adpt->base + EMAC_DESC_CTRL_3); 325 writel(adpt->rx_q.rrd.count & RRD_RING_SIZE_BMSK, 326 adpt->base + EMAC_DESC_CTRL_6); 327 328 writel(adpt->rxbuf_size & RX_BUFFER_SIZE_BMSK, 329 adpt->base + EMAC_DESC_CTRL_4); 330 331 writel(0, adpt->base + EMAC_DESC_CTRL_11); 332 333 /* Load all of the base addresses above and ensure that triggering HW to 334 * read ring pointers is flushed 335 */ 336 writel(1, adpt->base + EMAC_INTER_SRAM_PART9); 337 } 338 339 /* Config transmit parameters */ 340 static void emac_mac_tx_config(struct emac_adapter *adpt) 341 { 342 u32 val; 343 344 writel((EMAC_MAX_TX_OFFLOAD_THRESH >> 3) & 345 JUMBO_TASK_OFFLOAD_THRESHOLD_BMSK, adpt->base + EMAC_TXQ_CTRL_1); 346 347 val = (adpt->tpd_burst << NUM_TPD_BURST_PREF_SHFT) & 348 NUM_TPD_BURST_PREF_BMSK; 349 350 val |= TXQ_MODE | LS_8023_SP; 351 val |= (0x0100 << NUM_TXF_BURST_PREF_SHFT) & 352 NUM_TXF_BURST_PREF_BMSK; 353 354 writel(val, adpt->base + EMAC_TXQ_CTRL_0); 355 emac_reg_update32(adpt->base + EMAC_TXQ_CTRL_2, 356 (TXF_HWM_BMSK | TXF_LWM_BMSK), 0); 357 } 358 359 /* Config receive parameters */ 360 static void emac_mac_rx_config(struct emac_adapter *adpt) 361 { 362 u32 val; 363 364 val = (adpt->rfd_burst << NUM_RFD_BURST_PREF_SHFT) & 365 NUM_RFD_BURST_PREF_BMSK; 366 val |= (SP_IPV6 | CUT_THRU_EN); 367 368 writel(val, adpt->base + EMAC_RXQ_CTRL_0); 369 370 val = readl(adpt->base + EMAC_RXQ_CTRL_1); 371 val &= ~(JUMBO_1KAH_BMSK | RFD_PREF_LOW_THRESHOLD_BMSK | 372 RFD_PREF_UP_THRESHOLD_BMSK); 373 val |= (JUMBO_1KAH << JUMBO_1KAH_SHFT) | 374 (RFD_PREF_LOW_TH << RFD_PREF_LOW_THRESHOLD_SHFT) | 375 (RFD_PREF_UP_TH << RFD_PREF_UP_THRESHOLD_SHFT); 376 writel(val, adpt->base + EMAC_RXQ_CTRL_1); 377 378 val = readl(adpt->base + EMAC_RXQ_CTRL_2); 379 val &= ~(RXF_DOF_THRESHOLD_BMSK | RXF_UOF_THRESHOLD_BMSK); 380 val |= (RXF_DOF_THRESFHOLD << RXF_DOF_THRESHOLD_SHFT) | 381 (RXF_UOF_THRESFHOLD << RXF_UOF_THRESHOLD_SHFT); 382 writel(val, adpt->base + EMAC_RXQ_CTRL_2); 383 384 val = readl(adpt->base + EMAC_RXQ_CTRL_3); 385 val &= ~(RXD_TIMER_BMSK | RXD_THRESHOLD_BMSK); 386 val |= RXD_TH << RXD_THRESHOLD_SHFT; 387 writel(val, adpt->base + EMAC_RXQ_CTRL_3); 388 } 389 390 /* Config dma */ 391 static void emac_mac_dma_config(struct emac_adapter *adpt) 392 { 393 u32 dma_ctrl = DMAR_REQ_PRI; 394 395 switch (adpt->dma_order) { 396 case emac_dma_ord_in: 397 dma_ctrl |= IN_ORDER_MODE; 398 break; 399 case emac_dma_ord_enh: 400 dma_ctrl |= ENH_ORDER_MODE; 401 break; 402 case emac_dma_ord_out: 403 dma_ctrl |= OUT_ORDER_MODE; 404 break; 405 default: 406 break; 407 } 408 409 dma_ctrl |= (((u32)adpt->dmar_block) << REGRDBLEN_SHFT) & 410 REGRDBLEN_BMSK; 411 dma_ctrl |= (((u32)adpt->dmaw_block) << REGWRBLEN_SHFT) & 412 REGWRBLEN_BMSK; 413 dma_ctrl |= (((u32)adpt->dmar_dly_cnt) << DMAR_DLY_CNT_SHFT) & 414 DMAR_DLY_CNT_BMSK; 415 dma_ctrl |= (((u32)adpt->dmaw_dly_cnt) << DMAW_DLY_CNT_SHFT) & 416 DMAW_DLY_CNT_BMSK; 417 418 /* config DMA and ensure that configuration is flushed to HW */ 419 writel(dma_ctrl, adpt->base + EMAC_DMA_CTRL); 420 } 421 422 /* set MAC address */ 423 static void emac_set_mac_address(struct emac_adapter *adpt, u8 *addr) 424 { 425 u32 sta; 426 427 /* for example: 00-A0-C6-11-22-33 428 * 0<-->C6112233, 1<-->00A0. 429 */ 430 431 /* low 32bit word */ 432 sta = (((u32)addr[2]) << 24) | (((u32)addr[3]) << 16) | 433 (((u32)addr[4]) << 8) | (((u32)addr[5])); 434 writel(sta, adpt->base + EMAC_MAC_STA_ADDR0); 435 436 /* hight 32bit word */ 437 sta = (((u32)addr[0]) << 8) | (u32)addr[1]; 438 writel(sta, adpt->base + EMAC_MAC_STA_ADDR1); 439 } 440 441 static void emac_mac_config(struct emac_adapter *adpt) 442 { 443 struct net_device *netdev = adpt->netdev; 444 unsigned int max_frame; 445 u32 val; 446 447 emac_set_mac_address(adpt, netdev->dev_addr); 448 449 max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN; 450 adpt->rxbuf_size = netdev->mtu > EMAC_DEF_RX_BUF_SIZE ? 451 ALIGN(max_frame, 8) : EMAC_DEF_RX_BUF_SIZE; 452 453 emac_mac_dma_rings_config(adpt); 454 455 writel(netdev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN, 456 adpt->base + EMAC_MAX_FRAM_LEN_CTRL); 457 458 emac_mac_tx_config(adpt); 459 emac_mac_rx_config(adpt); 460 emac_mac_dma_config(adpt); 461 462 val = readl(adpt->base + EMAC_AXI_MAST_CTRL); 463 val &= ~(DATA_BYTE_SWAP | MAX_BOUND); 464 val |= MAX_BTYPE; 465 writel(val, adpt->base + EMAC_AXI_MAST_CTRL); 466 writel(0, adpt->base + EMAC_CLK_GATE_CTRL); 467 writel(RX_UNCPL_INT_EN, adpt->base + EMAC_MISC_CTRL); 468 } 469 470 void emac_mac_reset(struct emac_adapter *adpt) 471 { 472 emac_mac_stop(adpt); 473 474 emac_reg_update32(adpt->base + EMAC_DMA_MAS_CTRL, 0, SOFT_RST); 475 usleep_range(100, 150); /* reset may take up to 100usec */ 476 477 /* interrupt clear-on-read */ 478 emac_reg_update32(adpt->base + EMAC_DMA_MAS_CTRL, 0, INT_RD_CLR_EN); 479 } 480 481 static void emac_mac_start(struct emac_adapter *adpt) 482 { 483 struct phy_device *phydev = adpt->phydev; 484 u32 mac, csr1; 485 486 /* enable tx queue */ 487 emac_reg_update32(adpt->base + EMAC_TXQ_CTRL_0, 0, TXQ_EN); 488 489 /* enable rx queue */ 490 emac_reg_update32(adpt->base + EMAC_RXQ_CTRL_0, 0, RXQ_EN); 491 492 /* enable mac control */ 493 mac = readl(adpt->base + EMAC_MAC_CTRL); 494 csr1 = readl(adpt->csr + EMAC_EMAC_WRAPPER_CSR1); 495 496 mac |= TXEN | RXEN; /* enable RX/TX */ 497 498 /* Configure MAC flow control. If set to automatic, then match 499 * whatever the PHY does. Otherwise, enable or disable it, depending 500 * on what the user configured via ethtool. 501 */ 502 mac &= ~(RXFC | TXFC); 503 504 if (adpt->automatic) { 505 /* If it's set to automatic, then update our local values */ 506 adpt->rx_flow_control = phydev->pause; 507 adpt->tx_flow_control = phydev->pause != phydev->asym_pause; 508 } 509 mac |= adpt->rx_flow_control ? RXFC : 0; 510 mac |= adpt->tx_flow_control ? TXFC : 0; 511 512 /* setup link speed */ 513 mac &= ~SPEED_MASK; 514 if (phydev->speed == SPEED_1000) { 515 mac |= SPEED(2); 516 csr1 |= FREQ_MODE; 517 } else { 518 mac |= SPEED(1); 519 csr1 &= ~FREQ_MODE; 520 } 521 522 if (phydev->duplex == DUPLEX_FULL) 523 mac |= FULLD; 524 else 525 mac &= ~FULLD; 526 527 /* other parameters */ 528 mac |= (CRCE | PCRCE); 529 mac |= ((adpt->preamble << PRLEN_SHFT) & PRLEN_BMSK); 530 mac |= BROAD_EN; 531 mac |= FLCHK; 532 mac &= ~RX_CHKSUM_EN; 533 mac &= ~(HUGEN | VLAN_STRIP | TPAUSE | SIMR | HUGE | MULTI_ALL | 534 DEBUG_MODE | SINGLE_PAUSE_MODE); 535 536 /* Enable single-pause-frame mode if requested. 537 * 538 * If enabled, the EMAC will send a single pause frame when the RX 539 * queue is full. This normally leads to packet loss because 540 * the pause frame disables the remote MAC only for 33ms (the quanta), 541 * and then the remote MAC continues sending packets even though 542 * the RX queue is still full. 543 * 544 * If disabled, the EMAC sends a pause frame every 31ms until the RX 545 * queue is no longer full. Normally, this is the preferred 546 * method of operation. However, when the system is hung (e.g. 547 * cores are halted), the EMAC interrupt handler is never called 548 * and so the RX queue fills up quickly and stays full. The resuling 549 * non-stop "flood" of pause frames sometimes has the effect of 550 * disabling nearby switches. In some cases, other nearby switches 551 * are also affected, shutting down the entire network. 552 * 553 * The user can enable or disable single-pause-frame mode 554 * via ethtool. 555 */ 556 mac |= adpt->single_pause_mode ? SINGLE_PAUSE_MODE : 0; 557 558 writel_relaxed(csr1, adpt->csr + EMAC_EMAC_WRAPPER_CSR1); 559 560 writel_relaxed(mac, adpt->base + EMAC_MAC_CTRL); 561 562 /* enable interrupt read clear, low power sleep mode and 563 * the irq moderators 564 */ 565 566 writel_relaxed(adpt->irq_mod, adpt->base + EMAC_IRQ_MOD_TIM_INIT); 567 writel_relaxed(INT_RD_CLR_EN | LPW_MODE | IRQ_MODERATOR_EN | 568 IRQ_MODERATOR2_EN, adpt->base + EMAC_DMA_MAS_CTRL); 569 570 emac_mac_mode_config(adpt); 571 572 emac_reg_update32(adpt->base + EMAC_ATHR_HEADER_CTRL, 573 (HEADER_ENABLE | HEADER_CNT_EN), 0); 574 } 575 576 void emac_mac_stop(struct emac_adapter *adpt) 577 { 578 emac_reg_update32(adpt->base + EMAC_RXQ_CTRL_0, RXQ_EN, 0); 579 emac_reg_update32(adpt->base + EMAC_TXQ_CTRL_0, TXQ_EN, 0); 580 emac_reg_update32(adpt->base + EMAC_MAC_CTRL, TXEN | RXEN, 0); 581 usleep_range(1000, 1050); /* stopping mac may take upto 1msec */ 582 } 583 584 /* Free all descriptors of given transmit queue */ 585 static void emac_tx_q_descs_free(struct emac_adapter *adpt) 586 { 587 struct emac_tx_queue *tx_q = &adpt->tx_q; 588 unsigned int i; 589 size_t size; 590 591 /* ring already cleared, nothing to do */ 592 if (!tx_q->tpd.tpbuff) 593 return; 594 595 for (i = 0; i < tx_q->tpd.count; i++) { 596 struct emac_buffer *tpbuf = GET_TPD_BUFFER(tx_q, i); 597 598 if (tpbuf->dma_addr) { 599 dma_unmap_single(adpt->netdev->dev.parent, 600 tpbuf->dma_addr, tpbuf->length, 601 DMA_TO_DEVICE); 602 tpbuf->dma_addr = 0; 603 } 604 if (tpbuf->skb) { 605 dev_kfree_skb_any(tpbuf->skb); 606 tpbuf->skb = NULL; 607 } 608 } 609 610 size = sizeof(struct emac_buffer) * tx_q->tpd.count; 611 memset(tx_q->tpd.tpbuff, 0, size); 612 613 /* clear the descriptor ring */ 614 memset(tx_q->tpd.v_addr, 0, tx_q->tpd.size); 615 616 tx_q->tpd.consume_idx = 0; 617 tx_q->tpd.produce_idx = 0; 618 } 619 620 /* Free all descriptors of given receive queue */ 621 static void emac_rx_q_free_descs(struct emac_adapter *adpt) 622 { 623 struct device *dev = adpt->netdev->dev.parent; 624 struct emac_rx_queue *rx_q = &adpt->rx_q; 625 unsigned int i; 626 size_t size; 627 628 /* ring already cleared, nothing to do */ 629 if (!rx_q->rfd.rfbuff) 630 return; 631 632 for (i = 0; i < rx_q->rfd.count; i++) { 633 struct emac_buffer *rfbuf = GET_RFD_BUFFER(rx_q, i); 634 635 if (rfbuf->dma_addr) { 636 dma_unmap_single(dev, rfbuf->dma_addr, rfbuf->length, 637 DMA_FROM_DEVICE); 638 rfbuf->dma_addr = 0; 639 } 640 if (rfbuf->skb) { 641 dev_kfree_skb(rfbuf->skb); 642 rfbuf->skb = NULL; 643 } 644 } 645 646 size = sizeof(struct emac_buffer) * rx_q->rfd.count; 647 memset(rx_q->rfd.rfbuff, 0, size); 648 649 /* clear the descriptor rings */ 650 memset(rx_q->rrd.v_addr, 0, rx_q->rrd.size); 651 rx_q->rrd.produce_idx = 0; 652 rx_q->rrd.consume_idx = 0; 653 654 memset(rx_q->rfd.v_addr, 0, rx_q->rfd.size); 655 rx_q->rfd.produce_idx = 0; 656 rx_q->rfd.consume_idx = 0; 657 } 658 659 /* Free all buffers associated with given transmit queue */ 660 static void emac_tx_q_bufs_free(struct emac_adapter *adpt) 661 { 662 struct emac_tx_queue *tx_q = &adpt->tx_q; 663 664 emac_tx_q_descs_free(adpt); 665 666 kfree(tx_q->tpd.tpbuff); 667 tx_q->tpd.tpbuff = NULL; 668 tx_q->tpd.v_addr = NULL; 669 tx_q->tpd.dma_addr = 0; 670 tx_q->tpd.size = 0; 671 } 672 673 /* Allocate TX descriptor ring for the given transmit queue */ 674 static int emac_tx_q_desc_alloc(struct emac_adapter *adpt, 675 struct emac_tx_queue *tx_q) 676 { 677 struct emac_ring_header *ring_header = &adpt->ring_header; 678 int node = dev_to_node(adpt->netdev->dev.parent); 679 size_t size; 680 681 size = sizeof(struct emac_buffer) * tx_q->tpd.count; 682 tx_q->tpd.tpbuff = kzalloc_node(size, GFP_KERNEL, node); 683 if (!tx_q->tpd.tpbuff) 684 return -ENOMEM; 685 686 tx_q->tpd.size = tx_q->tpd.count * (adpt->tpd_size * 4); 687 tx_q->tpd.dma_addr = ring_header->dma_addr + ring_header->used; 688 tx_q->tpd.v_addr = ring_header->v_addr + ring_header->used; 689 ring_header->used += ALIGN(tx_q->tpd.size, 8); 690 tx_q->tpd.produce_idx = 0; 691 tx_q->tpd.consume_idx = 0; 692 693 return 0; 694 } 695 696 /* Free all buffers associated with given transmit queue */ 697 static void emac_rx_q_bufs_free(struct emac_adapter *adpt) 698 { 699 struct emac_rx_queue *rx_q = &adpt->rx_q; 700 701 emac_rx_q_free_descs(adpt); 702 703 kfree(rx_q->rfd.rfbuff); 704 rx_q->rfd.rfbuff = NULL; 705 706 rx_q->rfd.v_addr = NULL; 707 rx_q->rfd.dma_addr = 0; 708 rx_q->rfd.size = 0; 709 710 rx_q->rrd.v_addr = NULL; 711 rx_q->rrd.dma_addr = 0; 712 rx_q->rrd.size = 0; 713 } 714 715 /* Allocate RX descriptor rings for the given receive queue */ 716 static int emac_rx_descs_alloc(struct emac_adapter *adpt) 717 { 718 struct emac_ring_header *ring_header = &adpt->ring_header; 719 int node = dev_to_node(adpt->netdev->dev.parent); 720 struct emac_rx_queue *rx_q = &adpt->rx_q; 721 size_t size; 722 723 size = sizeof(struct emac_buffer) * rx_q->rfd.count; 724 rx_q->rfd.rfbuff = kzalloc_node(size, GFP_KERNEL, node); 725 if (!rx_q->rfd.rfbuff) 726 return -ENOMEM; 727 728 rx_q->rrd.size = rx_q->rrd.count * (adpt->rrd_size * 4); 729 rx_q->rfd.size = rx_q->rfd.count * (adpt->rfd_size * 4); 730 731 rx_q->rrd.dma_addr = ring_header->dma_addr + ring_header->used; 732 rx_q->rrd.v_addr = ring_header->v_addr + ring_header->used; 733 ring_header->used += ALIGN(rx_q->rrd.size, 8); 734 735 rx_q->rfd.dma_addr = ring_header->dma_addr + ring_header->used; 736 rx_q->rfd.v_addr = ring_header->v_addr + ring_header->used; 737 ring_header->used += ALIGN(rx_q->rfd.size, 8); 738 739 rx_q->rrd.produce_idx = 0; 740 rx_q->rrd.consume_idx = 0; 741 742 rx_q->rfd.produce_idx = 0; 743 rx_q->rfd.consume_idx = 0; 744 745 return 0; 746 } 747 748 /* Allocate all TX and RX descriptor rings */ 749 int emac_mac_rx_tx_rings_alloc_all(struct emac_adapter *adpt) 750 { 751 struct emac_ring_header *ring_header = &adpt->ring_header; 752 struct device *dev = adpt->netdev->dev.parent; 753 unsigned int num_tx_descs = adpt->tx_desc_cnt; 754 unsigned int num_rx_descs = adpt->rx_desc_cnt; 755 int ret; 756 757 adpt->tx_q.tpd.count = adpt->tx_desc_cnt; 758 759 adpt->rx_q.rrd.count = adpt->rx_desc_cnt; 760 adpt->rx_q.rfd.count = adpt->rx_desc_cnt; 761 762 /* Ring DMA buffer. Each ring may need up to 8 bytes for alignment, 763 * hence the additional padding bytes are allocated. 764 */ 765 ring_header->size = num_tx_descs * (adpt->tpd_size * 4) + 766 num_rx_descs * (adpt->rfd_size * 4) + 767 num_rx_descs * (adpt->rrd_size * 4) + 768 8 + 2 * 8; /* 8 byte per one Tx and two Rx rings */ 769 770 ring_header->used = 0; 771 ring_header->v_addr = dma_alloc_coherent(dev, ring_header->size, 772 &ring_header->dma_addr, 773 GFP_KERNEL); 774 if (!ring_header->v_addr) 775 return -ENOMEM; 776 777 ring_header->used = ALIGN(ring_header->dma_addr, 8) - 778 ring_header->dma_addr; 779 780 ret = emac_tx_q_desc_alloc(adpt, &adpt->tx_q); 781 if (ret) { 782 netdev_err(adpt->netdev, "error: Tx Queue alloc failed\n"); 783 goto err_alloc_tx; 784 } 785 786 ret = emac_rx_descs_alloc(adpt); 787 if (ret) { 788 netdev_err(adpt->netdev, "error: Rx Queue alloc failed\n"); 789 goto err_alloc_rx; 790 } 791 792 return 0; 793 794 err_alloc_rx: 795 emac_tx_q_bufs_free(adpt); 796 err_alloc_tx: 797 dma_free_coherent(dev, ring_header->size, 798 ring_header->v_addr, ring_header->dma_addr); 799 800 ring_header->v_addr = NULL; 801 ring_header->dma_addr = 0; 802 ring_header->size = 0; 803 ring_header->used = 0; 804 805 return ret; 806 } 807 808 /* Free all TX and RX descriptor rings */ 809 void emac_mac_rx_tx_rings_free_all(struct emac_adapter *adpt) 810 { 811 struct emac_ring_header *ring_header = &adpt->ring_header; 812 struct device *dev = adpt->netdev->dev.parent; 813 814 emac_tx_q_bufs_free(adpt); 815 emac_rx_q_bufs_free(adpt); 816 817 dma_free_coherent(dev, ring_header->size, 818 ring_header->v_addr, ring_header->dma_addr); 819 820 ring_header->v_addr = NULL; 821 ring_header->dma_addr = 0; 822 ring_header->size = 0; 823 ring_header->used = 0; 824 } 825 826 /* Initialize descriptor rings */ 827 static void emac_mac_rx_tx_ring_reset_all(struct emac_adapter *adpt) 828 { 829 unsigned int i; 830 831 adpt->tx_q.tpd.produce_idx = 0; 832 adpt->tx_q.tpd.consume_idx = 0; 833 for (i = 0; i < adpt->tx_q.tpd.count; i++) 834 adpt->tx_q.tpd.tpbuff[i].dma_addr = 0; 835 836 adpt->rx_q.rrd.produce_idx = 0; 837 adpt->rx_q.rrd.consume_idx = 0; 838 adpt->rx_q.rfd.produce_idx = 0; 839 adpt->rx_q.rfd.consume_idx = 0; 840 for (i = 0; i < adpt->rx_q.rfd.count; i++) 841 adpt->rx_q.rfd.rfbuff[i].dma_addr = 0; 842 } 843 844 /* Produce new receive free descriptor */ 845 static void emac_mac_rx_rfd_create(struct emac_adapter *adpt, 846 struct emac_rx_queue *rx_q, 847 dma_addr_t addr) 848 { 849 u32 *hw_rfd = EMAC_RFD(rx_q, adpt->rfd_size, rx_q->rfd.produce_idx); 850 851 *(hw_rfd++) = lower_32_bits(addr); 852 *hw_rfd = upper_32_bits(addr); 853 854 if (++rx_q->rfd.produce_idx == rx_q->rfd.count) 855 rx_q->rfd.produce_idx = 0; 856 } 857 858 /* Fill up receive queue's RFD with preallocated receive buffers */ 859 static void emac_mac_rx_descs_refill(struct emac_adapter *adpt, 860 struct emac_rx_queue *rx_q) 861 { 862 struct emac_buffer *curr_rxbuf; 863 struct emac_buffer *next_rxbuf; 864 unsigned int count = 0; 865 u32 next_produce_idx; 866 867 next_produce_idx = rx_q->rfd.produce_idx + 1; 868 if (next_produce_idx == rx_q->rfd.count) 869 next_produce_idx = 0; 870 871 curr_rxbuf = GET_RFD_BUFFER(rx_q, rx_q->rfd.produce_idx); 872 next_rxbuf = GET_RFD_BUFFER(rx_q, next_produce_idx); 873 874 /* this always has a blank rx_buffer*/ 875 while (!next_rxbuf->dma_addr) { 876 struct sk_buff *skb; 877 int ret; 878 879 skb = netdev_alloc_skb_ip_align(adpt->netdev, adpt->rxbuf_size); 880 if (!skb) 881 break; 882 883 curr_rxbuf->dma_addr = 884 dma_map_single(adpt->netdev->dev.parent, skb->data, 885 adpt->rxbuf_size, DMA_FROM_DEVICE); 886 887 ret = dma_mapping_error(adpt->netdev->dev.parent, 888 curr_rxbuf->dma_addr); 889 if (ret) { 890 dev_kfree_skb(skb); 891 break; 892 } 893 curr_rxbuf->skb = skb; 894 curr_rxbuf->length = adpt->rxbuf_size; 895 896 emac_mac_rx_rfd_create(adpt, rx_q, curr_rxbuf->dma_addr); 897 next_produce_idx = rx_q->rfd.produce_idx + 1; 898 if (next_produce_idx == rx_q->rfd.count) 899 next_produce_idx = 0; 900 901 curr_rxbuf = GET_RFD_BUFFER(rx_q, rx_q->rfd.produce_idx); 902 next_rxbuf = GET_RFD_BUFFER(rx_q, next_produce_idx); 903 count++; 904 } 905 906 if (count) { 907 u32 prod_idx = (rx_q->rfd.produce_idx << rx_q->produce_shift) & 908 rx_q->produce_mask; 909 emac_reg_update32(adpt->base + rx_q->produce_reg, 910 rx_q->produce_mask, prod_idx); 911 } 912 } 913 914 static void emac_adjust_link(struct net_device *netdev) 915 { 916 struct emac_adapter *adpt = netdev_priv(netdev); 917 struct phy_device *phydev = netdev->phydev; 918 919 if (phydev->link) { 920 emac_mac_start(adpt); 921 emac_sgmii_link_change(adpt, true); 922 } else { 923 emac_sgmii_link_change(adpt, false); 924 emac_mac_stop(adpt); 925 } 926 927 phy_print_status(phydev); 928 } 929 930 /* Bringup the interface/HW */ 931 int emac_mac_up(struct emac_adapter *adpt) 932 { 933 struct net_device *netdev = adpt->netdev; 934 int ret; 935 936 emac_mac_rx_tx_ring_reset_all(adpt); 937 emac_mac_config(adpt); 938 emac_mac_rx_descs_refill(adpt, &adpt->rx_q); 939 940 adpt->phydev->irq = PHY_POLL; 941 ret = phy_connect_direct(netdev, adpt->phydev, emac_adjust_link, 942 PHY_INTERFACE_MODE_SGMII); 943 if (ret) { 944 netdev_err(adpt->netdev, "could not connect phy\n"); 945 return ret; 946 } 947 948 phy_attached_print(adpt->phydev, NULL); 949 950 /* enable mac irq */ 951 writel((u32)~DIS_INT, adpt->base + EMAC_INT_STATUS); 952 writel(adpt->irq.mask, adpt->base + EMAC_INT_MASK); 953 954 phy_start(adpt->phydev); 955 956 napi_enable(&adpt->rx_q.napi); 957 netif_start_queue(netdev); 958 959 return 0; 960 } 961 962 /* Bring down the interface/HW */ 963 void emac_mac_down(struct emac_adapter *adpt) 964 { 965 struct net_device *netdev = adpt->netdev; 966 967 netif_stop_queue(netdev); 968 napi_disable(&adpt->rx_q.napi); 969 970 phy_stop(adpt->phydev); 971 972 /* Interrupts must be disabled before the PHY is disconnected, to 973 * avoid a race condition where adjust_link is null when we get 974 * an interrupt. 975 */ 976 writel(DIS_INT, adpt->base + EMAC_INT_STATUS); 977 writel(0, adpt->base + EMAC_INT_MASK); 978 synchronize_irq(adpt->irq.irq); 979 980 phy_disconnect(adpt->phydev); 981 982 emac_mac_reset(adpt); 983 984 emac_tx_q_descs_free(adpt); 985 netdev_reset_queue(adpt->netdev); 986 emac_rx_q_free_descs(adpt); 987 } 988 989 /* Consume next received packet descriptor */ 990 static bool emac_rx_process_rrd(struct emac_adapter *adpt, 991 struct emac_rx_queue *rx_q, 992 struct emac_rrd *rrd) 993 { 994 u32 *hw_rrd = EMAC_RRD(rx_q, adpt->rrd_size, rx_q->rrd.consume_idx); 995 996 rrd->word[3] = *(hw_rrd + 3); 997 998 if (!RRD_UPDT(rrd)) 999 return false; 1000 1001 rrd->word[4] = 0; 1002 rrd->word[5] = 0; 1003 1004 rrd->word[0] = *(hw_rrd++); 1005 rrd->word[1] = *(hw_rrd++); 1006 rrd->word[2] = *(hw_rrd++); 1007 1008 if (unlikely(RRD_NOR(rrd) != 1)) { 1009 netdev_err(adpt->netdev, 1010 "error: multi-RFD not support yet! nor:%lu\n", 1011 RRD_NOR(rrd)); 1012 } 1013 1014 /* mark rrd as processed */ 1015 RRD_UPDT_SET(rrd, 0); 1016 *hw_rrd = rrd->word[3]; 1017 1018 if (++rx_q->rrd.consume_idx == rx_q->rrd.count) 1019 rx_q->rrd.consume_idx = 0; 1020 1021 return true; 1022 } 1023 1024 /* Produce new transmit descriptor */ 1025 static void emac_tx_tpd_create(struct emac_adapter *adpt, 1026 struct emac_tx_queue *tx_q, struct emac_tpd *tpd) 1027 { 1028 u32 *hw_tpd; 1029 1030 tx_q->tpd.last_produce_idx = tx_q->tpd.produce_idx; 1031 hw_tpd = EMAC_TPD(tx_q, adpt->tpd_size, tx_q->tpd.produce_idx); 1032 1033 if (++tx_q->tpd.produce_idx == tx_q->tpd.count) 1034 tx_q->tpd.produce_idx = 0; 1035 1036 *(hw_tpd++) = tpd->word[0]; 1037 *(hw_tpd++) = tpd->word[1]; 1038 *(hw_tpd++) = tpd->word[2]; 1039 *hw_tpd = tpd->word[3]; 1040 } 1041 1042 /* Mark the last transmit descriptor as such (for the transmit packet) */ 1043 static void emac_tx_tpd_mark_last(struct emac_adapter *adpt, 1044 struct emac_tx_queue *tx_q) 1045 { 1046 u32 *hw_tpd = 1047 EMAC_TPD(tx_q, adpt->tpd_size, tx_q->tpd.last_produce_idx); 1048 u32 tmp_tpd; 1049 1050 tmp_tpd = *(hw_tpd + 1); 1051 tmp_tpd |= EMAC_TPD_LAST_FRAGMENT; 1052 *(hw_tpd + 1) = tmp_tpd; 1053 } 1054 1055 static void emac_rx_rfd_clean(struct emac_rx_queue *rx_q, struct emac_rrd *rrd) 1056 { 1057 struct emac_buffer *rfbuf = rx_q->rfd.rfbuff; 1058 u32 consume_idx = RRD_SI(rrd); 1059 unsigned int i; 1060 1061 for (i = 0; i < RRD_NOR(rrd); i++) { 1062 rfbuf[consume_idx].skb = NULL; 1063 if (++consume_idx == rx_q->rfd.count) 1064 consume_idx = 0; 1065 } 1066 1067 rx_q->rfd.consume_idx = consume_idx; 1068 rx_q->rfd.process_idx = consume_idx; 1069 } 1070 1071 /* Push the received skb to upper layers */ 1072 static void emac_receive_skb(struct emac_rx_queue *rx_q, 1073 struct sk_buff *skb, 1074 u16 vlan_tag, bool vlan_flag) 1075 { 1076 if (vlan_flag) { 1077 u16 vlan; 1078 1079 EMAC_TAG_TO_VLAN(vlan_tag, vlan); 1080 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan); 1081 } 1082 1083 napi_gro_receive(&rx_q->napi, skb); 1084 } 1085 1086 /* Process receive event */ 1087 void emac_mac_rx_process(struct emac_adapter *adpt, struct emac_rx_queue *rx_q, 1088 int *num_pkts, int max_pkts) 1089 { 1090 u32 proc_idx, hw_consume_idx, num_consume_pkts; 1091 struct net_device *netdev = adpt->netdev; 1092 struct emac_buffer *rfbuf; 1093 unsigned int count = 0; 1094 struct emac_rrd rrd; 1095 struct sk_buff *skb; 1096 u32 reg; 1097 1098 reg = readl_relaxed(adpt->base + rx_q->consume_reg); 1099 1100 hw_consume_idx = (reg & rx_q->consume_mask) >> rx_q->consume_shift; 1101 num_consume_pkts = (hw_consume_idx >= rx_q->rrd.consume_idx) ? 1102 (hw_consume_idx - rx_q->rrd.consume_idx) : 1103 (hw_consume_idx + rx_q->rrd.count - rx_q->rrd.consume_idx); 1104 1105 do { 1106 if (!num_consume_pkts) 1107 break; 1108 1109 if (!emac_rx_process_rrd(adpt, rx_q, &rrd)) 1110 break; 1111 1112 if (likely(RRD_NOR(&rrd) == 1)) { 1113 /* good receive */ 1114 rfbuf = GET_RFD_BUFFER(rx_q, RRD_SI(&rrd)); 1115 dma_unmap_single(adpt->netdev->dev.parent, 1116 rfbuf->dma_addr, rfbuf->length, 1117 DMA_FROM_DEVICE); 1118 rfbuf->dma_addr = 0; 1119 skb = rfbuf->skb; 1120 } else { 1121 netdev_err(adpt->netdev, 1122 "error: multi-RFD not support yet!\n"); 1123 break; 1124 } 1125 emac_rx_rfd_clean(rx_q, &rrd); 1126 num_consume_pkts--; 1127 count++; 1128 1129 /* Due to a HW issue in L4 check sum detection (UDP/TCP frags 1130 * with DF set are marked as error), drop packets based on the 1131 * error mask rather than the summary bit (ignoring L4F errors) 1132 */ 1133 if (rrd.word[EMAC_RRD_STATS_DW_IDX] & EMAC_RRD_ERROR) { 1134 netif_dbg(adpt, rx_status, adpt->netdev, 1135 "Drop error packet[RRD: 0x%x:0x%x:0x%x:0x%x]\n", 1136 rrd.word[0], rrd.word[1], 1137 rrd.word[2], rrd.word[3]); 1138 1139 dev_kfree_skb(skb); 1140 continue; 1141 } 1142 1143 skb_put(skb, RRD_PKT_SIZE(&rrd) - ETH_FCS_LEN); 1144 skb->dev = netdev; 1145 skb->protocol = eth_type_trans(skb, skb->dev); 1146 if (netdev->features & NETIF_F_RXCSUM) 1147 skb->ip_summed = RRD_L4F(&rrd) ? 1148 CHECKSUM_NONE : CHECKSUM_UNNECESSARY; 1149 else 1150 skb_checksum_none_assert(skb); 1151 1152 emac_receive_skb(rx_q, skb, (u16)RRD_CVALN_TAG(&rrd), 1153 (bool)RRD_CVTAG(&rrd)); 1154 1155 (*num_pkts)++; 1156 } while (*num_pkts < max_pkts); 1157 1158 if (count) { 1159 proc_idx = (rx_q->rfd.process_idx << rx_q->process_shft) & 1160 rx_q->process_mask; 1161 emac_reg_update32(adpt->base + rx_q->process_reg, 1162 rx_q->process_mask, proc_idx); 1163 emac_mac_rx_descs_refill(adpt, rx_q); 1164 } 1165 } 1166 1167 /* get the number of free transmit descriptors */ 1168 static unsigned int emac_tpd_num_free_descs(struct emac_tx_queue *tx_q) 1169 { 1170 u32 produce_idx = tx_q->tpd.produce_idx; 1171 u32 consume_idx = tx_q->tpd.consume_idx; 1172 1173 return (consume_idx > produce_idx) ? 1174 (consume_idx - produce_idx - 1) : 1175 (tx_q->tpd.count + consume_idx - produce_idx - 1); 1176 } 1177 1178 /* Process transmit event */ 1179 void emac_mac_tx_process(struct emac_adapter *adpt, struct emac_tx_queue *tx_q) 1180 { 1181 u32 reg = readl_relaxed(adpt->base + tx_q->consume_reg); 1182 u32 hw_consume_idx, pkts_compl = 0, bytes_compl = 0; 1183 struct emac_buffer *tpbuf; 1184 1185 hw_consume_idx = (reg & tx_q->consume_mask) >> tx_q->consume_shift; 1186 1187 while (tx_q->tpd.consume_idx != hw_consume_idx) { 1188 tpbuf = GET_TPD_BUFFER(tx_q, tx_q->tpd.consume_idx); 1189 if (tpbuf->dma_addr) { 1190 dma_unmap_page(adpt->netdev->dev.parent, 1191 tpbuf->dma_addr, tpbuf->length, 1192 DMA_TO_DEVICE); 1193 tpbuf->dma_addr = 0; 1194 } 1195 1196 if (tpbuf->skb) { 1197 pkts_compl++; 1198 bytes_compl += tpbuf->skb->len; 1199 dev_consume_skb_irq(tpbuf->skb); 1200 tpbuf->skb = NULL; 1201 } 1202 1203 if (++tx_q->tpd.consume_idx == tx_q->tpd.count) 1204 tx_q->tpd.consume_idx = 0; 1205 } 1206 1207 netdev_completed_queue(adpt->netdev, pkts_compl, bytes_compl); 1208 1209 if (netif_queue_stopped(adpt->netdev)) 1210 if (emac_tpd_num_free_descs(tx_q) > (MAX_SKB_FRAGS + 1)) 1211 netif_wake_queue(adpt->netdev); 1212 } 1213 1214 /* Initialize all queue data structures */ 1215 void emac_mac_rx_tx_ring_init_all(struct platform_device *pdev, 1216 struct emac_adapter *adpt) 1217 { 1218 adpt->rx_q.netdev = adpt->netdev; 1219 1220 adpt->rx_q.produce_reg = EMAC_MAILBOX_0; 1221 adpt->rx_q.produce_mask = RFD0_PROD_IDX_BMSK; 1222 adpt->rx_q.produce_shift = RFD0_PROD_IDX_SHFT; 1223 1224 adpt->rx_q.process_reg = EMAC_MAILBOX_0; 1225 adpt->rx_q.process_mask = RFD0_PROC_IDX_BMSK; 1226 adpt->rx_q.process_shft = RFD0_PROC_IDX_SHFT; 1227 1228 adpt->rx_q.consume_reg = EMAC_MAILBOX_3; 1229 adpt->rx_q.consume_mask = RFD0_CONS_IDX_BMSK; 1230 adpt->rx_q.consume_shift = RFD0_CONS_IDX_SHFT; 1231 1232 adpt->rx_q.irq = &adpt->irq; 1233 adpt->rx_q.intr = adpt->irq.mask & ISR_RX_PKT; 1234 1235 adpt->tx_q.produce_reg = EMAC_MAILBOX_15; 1236 adpt->tx_q.produce_mask = NTPD_PROD_IDX_BMSK; 1237 adpt->tx_q.produce_shift = NTPD_PROD_IDX_SHFT; 1238 1239 adpt->tx_q.consume_reg = EMAC_MAILBOX_2; 1240 adpt->tx_q.consume_mask = NTPD_CONS_IDX_BMSK; 1241 adpt->tx_q.consume_shift = NTPD_CONS_IDX_SHFT; 1242 } 1243 1244 /* Fill up transmit descriptors with TSO and Checksum offload information */ 1245 static int emac_tso_csum(struct emac_adapter *adpt, 1246 struct emac_tx_queue *tx_q, 1247 struct sk_buff *skb, 1248 struct emac_tpd *tpd) 1249 { 1250 unsigned int hdr_len; 1251 int ret; 1252 1253 if (skb_is_gso(skb)) { 1254 if (skb_header_cloned(skb)) { 1255 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); 1256 if (unlikely(ret)) 1257 return ret; 1258 } 1259 1260 if (skb->protocol == htons(ETH_P_IP)) { 1261 u32 pkt_len = ((unsigned char *)ip_hdr(skb) - skb->data) 1262 + ntohs(ip_hdr(skb)->tot_len); 1263 if (skb->len > pkt_len) 1264 pskb_trim(skb, pkt_len); 1265 } 1266 1267 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb); 1268 if (unlikely(skb->len == hdr_len)) { 1269 /* we only need to do csum */ 1270 netif_warn(adpt, tx_err, adpt->netdev, 1271 "tso not needed for packet with 0 data\n"); 1272 goto do_csum; 1273 } 1274 1275 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { 1276 ip_hdr(skb)->check = 0; 1277 tcp_hdr(skb)->check = 1278 ~csum_tcpudp_magic(ip_hdr(skb)->saddr, 1279 ip_hdr(skb)->daddr, 1280 0, IPPROTO_TCP, 0); 1281 TPD_IPV4_SET(tpd, 1); 1282 } 1283 1284 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) { 1285 /* ipv6 tso need an extra tpd */ 1286 struct emac_tpd extra_tpd; 1287 1288 memset(tpd, 0, sizeof(*tpd)); 1289 memset(&extra_tpd, 0, sizeof(extra_tpd)); 1290 1291 tcp_v6_gso_csum_prep(skb); 1292 1293 TPD_PKT_LEN_SET(&extra_tpd, skb->len); 1294 TPD_LSO_SET(&extra_tpd, 1); 1295 TPD_LSOV_SET(&extra_tpd, 1); 1296 emac_tx_tpd_create(adpt, tx_q, &extra_tpd); 1297 TPD_LSOV_SET(tpd, 1); 1298 } 1299 1300 TPD_LSO_SET(tpd, 1); 1301 TPD_TCPHDR_OFFSET_SET(tpd, skb_transport_offset(skb)); 1302 TPD_MSS_SET(tpd, skb_shinfo(skb)->gso_size); 1303 return 0; 1304 } 1305 1306 do_csum: 1307 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { 1308 unsigned int css, cso; 1309 1310 cso = skb_transport_offset(skb); 1311 if (unlikely(cso & 0x1)) { 1312 netdev_err(adpt->netdev, 1313 "error: payload offset should be even\n"); 1314 return -EINVAL; 1315 } 1316 css = cso + skb->csum_offset; 1317 1318 TPD_PAYLOAD_OFFSET_SET(tpd, cso >> 1); 1319 TPD_CXSUM_OFFSET_SET(tpd, css >> 1); 1320 TPD_CSX_SET(tpd, 1); 1321 } 1322 1323 return 0; 1324 } 1325 1326 /* Fill up transmit descriptors */ 1327 static void emac_tx_fill_tpd(struct emac_adapter *adpt, 1328 struct emac_tx_queue *tx_q, struct sk_buff *skb, 1329 struct emac_tpd *tpd) 1330 { 1331 unsigned int nr_frags = skb_shinfo(skb)->nr_frags; 1332 unsigned int first = tx_q->tpd.produce_idx; 1333 unsigned int len = skb_headlen(skb); 1334 struct emac_buffer *tpbuf = NULL; 1335 unsigned int mapped_len = 0; 1336 unsigned int i; 1337 int count = 0; 1338 int ret; 1339 1340 /* if Large Segment Offload is (in TCP Segmentation Offload struct) */ 1341 if (TPD_LSO(tpd)) { 1342 mapped_len = skb_transport_offset(skb) + tcp_hdrlen(skb); 1343 1344 tpbuf = GET_TPD_BUFFER(tx_q, tx_q->tpd.produce_idx); 1345 tpbuf->length = mapped_len; 1346 tpbuf->dma_addr = dma_map_page(adpt->netdev->dev.parent, 1347 virt_to_page(skb->data), 1348 offset_in_page(skb->data), 1349 tpbuf->length, 1350 DMA_TO_DEVICE); 1351 ret = dma_mapping_error(adpt->netdev->dev.parent, 1352 tpbuf->dma_addr); 1353 if (ret) 1354 goto error; 1355 1356 TPD_BUFFER_ADDR_L_SET(tpd, lower_32_bits(tpbuf->dma_addr)); 1357 TPD_BUFFER_ADDR_H_SET(tpd, upper_32_bits(tpbuf->dma_addr)); 1358 TPD_BUF_LEN_SET(tpd, tpbuf->length); 1359 emac_tx_tpd_create(adpt, tx_q, tpd); 1360 count++; 1361 } 1362 1363 if (mapped_len < len) { 1364 tpbuf = GET_TPD_BUFFER(tx_q, tx_q->tpd.produce_idx); 1365 tpbuf->length = len - mapped_len; 1366 tpbuf->dma_addr = dma_map_page(adpt->netdev->dev.parent, 1367 virt_to_page(skb->data + 1368 mapped_len), 1369 offset_in_page(skb->data + 1370 mapped_len), 1371 tpbuf->length, DMA_TO_DEVICE); 1372 ret = dma_mapping_error(adpt->netdev->dev.parent, 1373 tpbuf->dma_addr); 1374 if (ret) 1375 goto error; 1376 1377 TPD_BUFFER_ADDR_L_SET(tpd, lower_32_bits(tpbuf->dma_addr)); 1378 TPD_BUFFER_ADDR_H_SET(tpd, upper_32_bits(tpbuf->dma_addr)); 1379 TPD_BUF_LEN_SET(tpd, tpbuf->length); 1380 emac_tx_tpd_create(adpt, tx_q, tpd); 1381 count++; 1382 } 1383 1384 for (i = 0; i < nr_frags; i++) { 1385 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1386 1387 tpbuf = GET_TPD_BUFFER(tx_q, tx_q->tpd.produce_idx); 1388 tpbuf->length = skb_frag_size(frag); 1389 tpbuf->dma_addr = skb_frag_dma_map(adpt->netdev->dev.parent, 1390 frag, 0, tpbuf->length, 1391 DMA_TO_DEVICE); 1392 ret = dma_mapping_error(adpt->netdev->dev.parent, 1393 tpbuf->dma_addr); 1394 if (ret) 1395 goto error; 1396 1397 TPD_BUFFER_ADDR_L_SET(tpd, lower_32_bits(tpbuf->dma_addr)); 1398 TPD_BUFFER_ADDR_H_SET(tpd, upper_32_bits(tpbuf->dma_addr)); 1399 TPD_BUF_LEN_SET(tpd, tpbuf->length); 1400 emac_tx_tpd_create(adpt, tx_q, tpd); 1401 count++; 1402 } 1403 1404 /* The last tpd */ 1405 wmb(); 1406 emac_tx_tpd_mark_last(adpt, tx_q); 1407 1408 /* The last buffer info contain the skb address, 1409 * so it will be freed after unmap 1410 */ 1411 tpbuf->skb = skb; 1412 1413 return; 1414 1415 error: 1416 /* One of the memory mappings failed, so undo everything */ 1417 tx_q->tpd.produce_idx = first; 1418 1419 while (count--) { 1420 tpbuf = GET_TPD_BUFFER(tx_q, first); 1421 dma_unmap_page(adpt->netdev->dev.parent, tpbuf->dma_addr, 1422 tpbuf->length, DMA_TO_DEVICE); 1423 tpbuf->dma_addr = 0; 1424 tpbuf->length = 0; 1425 1426 if (++first == tx_q->tpd.count) 1427 first = 0; 1428 } 1429 1430 dev_kfree_skb(skb); 1431 } 1432 1433 /* Transmit the packet using specified transmit queue */ 1434 netdev_tx_t emac_mac_tx_buf_send(struct emac_adapter *adpt, 1435 struct emac_tx_queue *tx_q, 1436 struct sk_buff *skb) 1437 { 1438 struct emac_tpd tpd; 1439 u32 prod_idx; 1440 int len; 1441 1442 memset(&tpd, 0, sizeof(tpd)); 1443 1444 if (emac_tso_csum(adpt, tx_q, skb, &tpd) != 0) { 1445 dev_kfree_skb_any(skb); 1446 return NETDEV_TX_OK; 1447 } 1448 1449 if (skb_vlan_tag_present(skb)) { 1450 u16 tag; 1451 1452 EMAC_VLAN_TO_TAG(skb_vlan_tag_get(skb), tag); 1453 TPD_CVLAN_TAG_SET(&tpd, tag); 1454 TPD_INSTC_SET(&tpd, 1); 1455 } 1456 1457 if (skb_network_offset(skb) != ETH_HLEN) 1458 TPD_TYP_SET(&tpd, 1); 1459 1460 len = skb->len; 1461 emac_tx_fill_tpd(adpt, tx_q, skb, &tpd); 1462 1463 netdev_sent_queue(adpt->netdev, len); 1464 1465 /* Make sure the are enough free descriptors to hold one 1466 * maximum-sized SKB. We need one desc for each fragment, 1467 * one for the checksum (emac_tso_csum), one for TSO, and 1468 * and one for the SKB header. 1469 */ 1470 if (emac_tpd_num_free_descs(tx_q) < (MAX_SKB_FRAGS + 3)) 1471 netif_stop_queue(adpt->netdev); 1472 1473 /* update produce idx */ 1474 prod_idx = (tx_q->tpd.produce_idx << tx_q->produce_shift) & 1475 tx_q->produce_mask; 1476 emac_reg_update32(adpt->base + tx_q->produce_reg, 1477 tx_q->produce_mask, prod_idx); 1478 1479 return NETDEV_TX_OK; 1480 } 1481