1 /* 2 * CDDL HEADER START 3 * 4 * Copyright(c) 2007-2009 Intel Corporation. All rights reserved. 5 * The contents of this file are subject to the terms of the 6 * Common Development and Distribution License (the "License"). 7 * You may not use this file except in compliance with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* 24 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 #include "igb_sw.h" 29 30 /* function prototypes */ 31 static mblk_t *igb_rx_bind(igb_rx_data_t *, uint32_t, uint32_t); 32 static mblk_t *igb_rx_copy(igb_rx_data_t *, uint32_t, uint32_t); 33 static void igb_rx_assoc_hcksum(mblk_t *, uint32_t); 34 35 #ifndef IGB_DEBUG 36 #pragma inline(igb_rx_assoc_hcksum) 37 #endif 38 39 40 /* 41 * igb_rx_recycle - the call-back function to reclaim rx buffer 42 * 43 * This function is called when an mp is freed by the user thru 44 * freeb call (Only for mp constructed through desballoc call). 45 * It returns back the freed buffer to the free list. 46 */ 47 void 48 igb_rx_recycle(caddr_t arg) 49 { 50 igb_t *igb; 51 igb_rx_ring_t *rx_ring; 52 igb_rx_data_t *rx_data; 53 rx_control_block_t *recycle_rcb; 54 uint32_t free_index; 55 uint32_t ref_cnt; 56 57 recycle_rcb = (rx_control_block_t *)(uintptr_t)arg; 58 rx_data = recycle_rcb->rx_data; 59 rx_ring = rx_data->rx_ring; 60 igb = rx_ring->igb; 61 62 if (recycle_rcb->ref_cnt == 0) { 63 /* 64 * This case only happens when rx buffers are being freed 65 * in igb_stop() and freemsg() is called. 66 */ 67 return; 68 } 69 70 ASSERT(recycle_rcb->mp == NULL); 71 72 /* 73 * Using the recycled data buffer to generate a new mblk 74 */ 75 recycle_rcb->mp = desballoc((unsigned char *) 76 recycle_rcb->rx_buf.address, 77 recycle_rcb->rx_buf.size, 78 0, &recycle_rcb->free_rtn); 79 80 /* 81 * Put the recycled rx control block into free list 82 */ 83 mutex_enter(&rx_data->recycle_lock); 84 85 free_index = rx_data->rcb_tail; 86 ASSERT(rx_data->free_list[free_index] == NULL); 87 88 rx_data->free_list[free_index] = recycle_rcb; 89 rx_data->rcb_tail = NEXT_INDEX(free_index, 1, rx_data->free_list_size); 90 91 mutex_exit(&rx_data->recycle_lock); 92 93 /* 94 * The atomic operation on the number of the available rx control 95 * blocks in the free list is used to make the recycling mutual 96 * exclusive with the receiving. 97 */ 98 atomic_inc_32(&rx_data->rcb_free); 99 ASSERT(rx_data->rcb_free <= rx_data->free_list_size); 100 101 /* 102 * Considering the case that the interface is unplumbed 103 * and there are still some buffers held by the upper layer. 104 * When the buffer is returned back, we need to free it. 105 */ 106 ref_cnt = atomic_dec_32_nv(&recycle_rcb->ref_cnt); 107 if (ref_cnt == 0) { 108 if (recycle_rcb->mp != NULL) { 109 freemsg(recycle_rcb->mp); 110 recycle_rcb->mp = NULL; 111 } 112 113 igb_free_dma_buffer(&recycle_rcb->rx_buf); 114 115 mutex_enter(&igb->rx_pending_lock); 116 atomic_dec_32(&rx_data->rcb_pending); 117 atomic_dec_32(&igb->rcb_pending); 118 119 /* 120 * When there is not any buffer belonging to this rx_data 121 * held by the upper layer, the rx_data can be freed. 122 */ 123 if ((rx_data->flag & IGB_RX_STOPPED) && 124 (rx_data->rcb_pending == 0)) 125 igb_free_rx_ring_data(rx_data); 126 127 mutex_exit(&igb->rx_pending_lock); 128 } 129 } 130 131 /* 132 * igb_rx_copy - Use copy to process the received packet 133 * 134 * This function will use bcopy to process the packet 135 * and send the copied packet upstream 136 */ 137 static mblk_t * 138 igb_rx_copy(igb_rx_data_t *rx_data, uint32_t index, uint32_t pkt_len) 139 { 140 rx_control_block_t *current_rcb; 141 mblk_t *mp; 142 igb_t *igb = rx_data->rx_ring->igb; 143 144 current_rcb = rx_data->work_list[index]; 145 146 DMA_SYNC(¤t_rcb->rx_buf, DDI_DMA_SYNC_FORKERNEL); 147 148 if (igb_check_dma_handle( 149 current_rcb->rx_buf.dma_handle) != DDI_FM_OK) { 150 ddi_fm_service_impact(igb->dip, DDI_SERVICE_DEGRADED); 151 atomic_or_32(&igb->igb_state, IGB_ERROR); 152 return (NULL); 153 } 154 155 /* 156 * Allocate buffer to receive this packet 157 */ 158 mp = allocb(pkt_len + IPHDR_ALIGN_ROOM, 0); 159 if (mp == NULL) { 160 igb_log(igb, "igb_rx_copy: allocate buffer failed"); 161 return (NULL); 162 } 163 164 /* 165 * Copy the data received into the new cluster 166 */ 167 mp->b_rptr += IPHDR_ALIGN_ROOM; 168 bcopy(current_rcb->rx_buf.address, mp->b_rptr, pkt_len); 169 mp->b_wptr = mp->b_rptr + pkt_len; 170 171 return (mp); 172 } 173 174 /* 175 * igb_rx_bind - Use existing DMA buffer to build mblk for receiving 176 * 177 * This function will use pre-bound DMA buffer to receive the packet 178 * and build mblk that will be sent upstream. 179 */ 180 static mblk_t * 181 igb_rx_bind(igb_rx_data_t *rx_data, uint32_t index, uint32_t pkt_len) 182 { 183 rx_control_block_t *current_rcb; 184 rx_control_block_t *free_rcb; 185 uint32_t free_index; 186 mblk_t *mp; 187 igb_t *igb = rx_data->rx_ring->igb; 188 189 /* 190 * If the free list is empty, we cannot proceed to send 191 * the current DMA buffer upstream. We'll have to return 192 * and use bcopy to process the packet. 193 */ 194 if (igb_atomic_reserve(&rx_data->rcb_free, 1) < 0) 195 return (NULL); 196 197 current_rcb = rx_data->work_list[index]; 198 /* 199 * If the mp of the rx control block is NULL, try to do 200 * desballoc again. 201 */ 202 if (current_rcb->mp == NULL) { 203 current_rcb->mp = desballoc((unsigned char *) 204 current_rcb->rx_buf.address, 205 current_rcb->rx_buf.size, 206 0, ¤t_rcb->free_rtn); 207 /* 208 * If it is failed to built a mblk using the current 209 * DMA buffer, we have to return and use bcopy to 210 * process the packet. 211 */ 212 if (current_rcb->mp == NULL) { 213 atomic_inc_32(&rx_data->rcb_free); 214 return (NULL); 215 } 216 } 217 /* 218 * Sync up the data received 219 */ 220 DMA_SYNC(¤t_rcb->rx_buf, DDI_DMA_SYNC_FORKERNEL); 221 222 if (igb_check_dma_handle( 223 current_rcb->rx_buf.dma_handle) != DDI_FM_OK) { 224 ddi_fm_service_impact(igb->dip, DDI_SERVICE_DEGRADED); 225 atomic_or_32(&igb->igb_state, IGB_ERROR); 226 atomic_inc_32(&rx_data->rcb_free); 227 return (NULL); 228 } 229 230 mp = current_rcb->mp; 231 current_rcb->mp = NULL; 232 atomic_inc_32(¤t_rcb->ref_cnt); 233 234 mp->b_wptr = mp->b_rptr + pkt_len; 235 mp->b_next = mp->b_cont = NULL; 236 237 /* 238 * Strip off one free rx control block from the free list 239 */ 240 free_index = rx_data->rcb_head; 241 free_rcb = rx_data->free_list[free_index]; 242 ASSERT(free_rcb != NULL); 243 rx_data->free_list[free_index] = NULL; 244 rx_data->rcb_head = NEXT_INDEX(free_index, 1, rx_data->free_list_size); 245 246 /* 247 * Put the rx control block to the work list 248 */ 249 rx_data->work_list[index] = free_rcb; 250 251 return (mp); 252 } 253 254 /* 255 * igb_rx_assoc_hcksum 256 * 257 * Check the rx hardware checksum status and associate the hcksum flags 258 */ 259 static void 260 igb_rx_assoc_hcksum(mblk_t *mp, uint32_t status_error) 261 { 262 uint32_t hcksum_flags = 0; 263 264 /* Ignore Checksum Indication */ 265 if (status_error & E1000_RXD_STAT_IXSM) 266 return; 267 268 /* 269 * Check TCP/UDP checksum 270 */ 271 if (((status_error & E1000_RXD_STAT_TCPCS) || 272 (status_error & E1000_RXD_STAT_UDPCS)) && 273 !(status_error & E1000_RXDEXT_STATERR_TCPE)) 274 hcksum_flags |= HCK_FULLCKSUM_OK; 275 276 /* 277 * Check IP Checksum 278 */ 279 if ((status_error & E1000_RXD_STAT_IPCS) && 280 !(status_error & E1000_RXDEXT_STATERR_IPE)) 281 hcksum_flags |= HCK_IPV4_HDRCKSUM_OK; 282 283 if (hcksum_flags != 0) { 284 mac_hcksum_set(mp, 0, 0, 0, 0, hcksum_flags); 285 } 286 } 287 288 mblk_t * 289 igb_rx_ring_poll(void *arg, int bytes) 290 { 291 igb_rx_ring_t *rx_ring = (igb_rx_ring_t *)arg; 292 mblk_t *mp = NULL; 293 294 ASSERT(bytes >= 0); 295 296 if ((bytes == 0) || (rx_ring->igb->igb_state & IGB_SUSPENDED) || 297 !(rx_ring->igb->igb_state & IGB_STARTED)) 298 return (NULL); 299 300 mutex_enter(&rx_ring->rx_lock); 301 mp = igb_rx(rx_ring, bytes); 302 mutex_exit(&rx_ring->rx_lock); 303 304 return (mp); 305 } 306 307 /* 308 * igb_rx - Receive the data of one ring 309 * 310 * This function goes throught h/w descriptor in one specified rx ring, 311 * receives the data if the descriptor status shows the data is ready. 312 * It returns a chain of mblks containing the received data, to be 313 * passed up to mac_rx(). 314 */ 315 mblk_t * 316 igb_rx(igb_rx_ring_t *rx_ring, int poll_bytes) 317 { 318 union e1000_adv_rx_desc *current_rbd; 319 rx_control_block_t *current_rcb; 320 mblk_t *mp; 321 mblk_t *mblk_head; 322 mblk_t **mblk_tail; 323 uint32_t rx_next; 324 uint32_t rx_tail; 325 uint32_t pkt_len; 326 uint32_t status_error; 327 uint32_t pkt_num; 328 uint32_t total_bytes; 329 igb_t *igb = rx_ring->igb; 330 igb_rx_data_t *rx_data = rx_ring->rx_data; 331 332 mblk_head = NULL; 333 mblk_tail = &mblk_head; 334 335 if (igb->igb_state & IGB_ERROR) 336 return (NULL); 337 338 /* 339 * Sync the receive descriptors before 340 * accepting the packets 341 */ 342 DMA_SYNC(&rx_data->rbd_area, DDI_DMA_SYNC_FORKERNEL); 343 344 if (igb_check_dma_handle( 345 rx_data->rbd_area.dma_handle) != DDI_FM_OK) { 346 ddi_fm_service_impact(igb->dip, DDI_SERVICE_DEGRADED); 347 atomic_or_32(&igb->igb_state, IGB_ERROR); 348 return (NULL); 349 } 350 351 /* 352 * Get the start point of rx bd ring which should be examined 353 * during this cycle. 354 */ 355 rx_next = rx_data->rbd_next; 356 357 current_rbd = &rx_data->rbd_ring[rx_next]; 358 pkt_num = 0; 359 total_bytes = 0; 360 status_error = current_rbd->wb.upper.status_error; 361 while (status_error & E1000_RXD_STAT_DD) { 362 /* 363 * If hardware has found the errors, but the error 364 * is hardware checksum error, here does not discard the 365 * packet, and let upper layer compute the checksum; 366 * Otherwise discard the packet. 367 */ 368 if ((status_error & E1000_RXDEXT_ERR_FRAME_ERR_MASK) || 369 !(status_error & E1000_RXD_STAT_EOP)) { 370 IGB_DEBUG_STAT(rx_ring->stat_frame_error); 371 goto rx_discard; 372 } 373 374 IGB_DEBUG_STAT_COND(rx_ring->stat_cksum_error, 375 (status_error & E1000_RXDEXT_STATERR_TCPE) || 376 (status_error & E1000_RXDEXT_STATERR_IPE)); 377 378 pkt_len = current_rbd->wb.upper.length; 379 380 if ((poll_bytes != IGB_NO_POLL) && 381 ((pkt_len + total_bytes) > poll_bytes)) 382 break; 383 384 IGB_DEBUG_STAT(rx_ring->stat_pkt_cnt); 385 total_bytes += pkt_len; 386 387 mp = NULL; 388 /* 389 * For packets with length more than the copy threshold, 390 * we'll firstly try to use the existed DMA buffer to built 391 * a mblk and send the mblk upstream. 392 * 393 * If the first method fails, or the packet length is less 394 * than the copy threshold, we'll allocate a new mblk and 395 * copy the packet data to the mblk. 396 */ 397 if (pkt_len > igb->rx_copy_thresh) 398 mp = igb_rx_bind(rx_data, rx_next, pkt_len); 399 400 if (mp == NULL) 401 mp = igb_rx_copy(rx_data, rx_next, pkt_len); 402 403 if (mp != NULL) { 404 /* 405 * Check h/w checksum offload status 406 */ 407 if (igb->rx_hcksum_enable) 408 igb_rx_assoc_hcksum(mp, status_error); 409 410 *mblk_tail = mp; 411 mblk_tail = &mp->b_next; 412 } 413 414 /* Update per-ring rx statistics */ 415 rx_ring->rx_pkts++; 416 rx_ring->rx_bytes += pkt_len; 417 418 rx_discard: 419 /* 420 * Reset rx descriptor read bits 421 */ 422 current_rcb = rx_data->work_list[rx_next]; 423 current_rbd->read.pkt_addr = current_rcb->rx_buf.dma_address; 424 current_rbd->read.hdr_addr = 0; 425 426 rx_next = NEXT_INDEX(rx_next, 1, rx_data->ring_size); 427 428 /* 429 * The receive function is in interrupt context, so here 430 * rx_limit_per_intr is used to avoid doing receiving too long 431 * per interrupt. 432 */ 433 if (++pkt_num > igb->rx_limit_per_intr) { 434 IGB_DEBUG_STAT(rx_ring->stat_exceed_pkt); 435 break; 436 } 437 438 current_rbd = &rx_data->rbd_ring[rx_next]; 439 status_error = current_rbd->wb.upper.status_error; 440 } 441 442 DMA_SYNC(&rx_data->rbd_area, DDI_DMA_SYNC_FORDEV); 443 444 rx_data->rbd_next = rx_next; 445 446 /* 447 * Update the h/w tail accordingly 448 */ 449 rx_tail = PREV_INDEX(rx_next, 1, rx_data->ring_size); 450 451 E1000_WRITE_REG(&igb->hw, E1000_RDT(rx_ring->index), rx_tail); 452 453 if (igb_check_acc_handle(igb->osdep.reg_handle) != DDI_FM_OK) { 454 ddi_fm_service_impact(igb->dip, DDI_SERVICE_DEGRADED); 455 atomic_or_32(&igb->igb_state, IGB_ERROR); 456 } 457 458 return (mblk_head); 459 } 460