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 2009 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 #include "ixgbe_sw.h" 29 30 /* function prototypes */ 31 static mblk_t *ixgbe_rx_bind(ixgbe_rx_data_t *, uint32_t, uint32_t); 32 static mblk_t *ixgbe_rx_copy(ixgbe_rx_data_t *, uint32_t, uint32_t); 33 static void ixgbe_rx_assoc_hcksum(mblk_t *, uint32_t); 34 35 #ifndef IXGBE_DEBUG 36 #pragma inline(ixgbe_rx_assoc_hcksum) 37 #endif 38 39 /* 40 * ixgbe_rx_recycle - The call-back function to reclaim rx buffer. 41 * 42 * This function is called when an mp is freed by the user thru 43 * freeb call (Only for mp constructed through desballoc call). 44 * It returns back the freed buffer to the free list. 45 */ 46 void 47 ixgbe_rx_recycle(caddr_t arg) 48 { 49 ixgbe_t *ixgbe; 50 ixgbe_rx_ring_t *rx_ring; 51 ixgbe_rx_data_t *rx_data; 52 rx_control_block_t *recycle_rcb; 53 uint32_t free_index; 54 uint32_t ref_cnt; 55 56 recycle_rcb = (rx_control_block_t *)(uintptr_t)arg; 57 rx_data = recycle_rcb->rx_data; 58 rx_ring = rx_data->rx_ring; 59 ixgbe = rx_ring->ixgbe; 60 61 if (recycle_rcb->ref_cnt == 0) { 62 /* 63 * This case only happens when rx buffers are being freed 64 * in ixgbe_stop() and freemsg() is called. 65 */ 66 return; 67 } 68 69 ASSERT(recycle_rcb->mp == NULL); 70 71 /* 72 * Using the recycled data buffer to generate a new mblk 73 */ 74 recycle_rcb->mp = desballoc((unsigned char *) 75 recycle_rcb->rx_buf.address, 76 recycle_rcb->rx_buf.size, 77 0, &recycle_rcb->free_rtn); 78 79 /* 80 * Put the recycled rx control block into free list 81 */ 82 mutex_enter(&rx_data->recycle_lock); 83 84 free_index = rx_data->rcb_tail; 85 ASSERT(rx_data->free_list[free_index] == NULL); 86 87 rx_data->free_list[free_index] = recycle_rcb; 88 rx_data->rcb_tail = NEXT_INDEX(free_index, 1, rx_data->free_list_size); 89 90 mutex_exit(&rx_data->recycle_lock); 91 92 /* 93 * The atomic operation on the number of the available rx control 94 * blocks in the free list is used to make the recycling mutual 95 * exclusive with the receiving. 96 */ 97 atomic_inc_32(&rx_data->rcb_free); 98 ASSERT(rx_data->rcb_free <= rx_data->free_list_size); 99 100 /* 101 * Considering the case that the interface is unplumbed 102 * and there are still some buffers held by the upper layer. 103 * When the buffer is returned back, we need to free it. 104 */ 105 ref_cnt = atomic_dec_32_nv(&recycle_rcb->ref_cnt); 106 if (ref_cnt == 0) { 107 if (recycle_rcb->mp != NULL) { 108 freemsg(recycle_rcb->mp); 109 recycle_rcb->mp = NULL; 110 } 111 112 ixgbe_free_dma_buffer(&recycle_rcb->rx_buf); 113 114 mutex_enter(&ixgbe->rx_pending_lock); 115 atomic_dec_32(&rx_data->rcb_pending); 116 atomic_dec_32(&ixgbe->rcb_pending); 117 118 /* 119 * When there is not any buffer belonging to this rx_data 120 * held by the upper layer, the rx_data can be freed. 121 */ 122 if ((rx_data->flag & IXGBE_RX_STOPPED) && 123 (rx_data->rcb_pending == 0)) 124 ixgbe_free_rx_ring_data(rx_data); 125 126 mutex_exit(&ixgbe->rx_pending_lock); 127 } 128 } 129 130 /* 131 * ixgbe_rx_copy - Use copy to process the received packet. 132 * 133 * This function will use bcopy to process the packet 134 * and send the copied packet upstream. 135 */ 136 static mblk_t * 137 ixgbe_rx_copy(ixgbe_rx_data_t *rx_data, uint32_t index, uint32_t pkt_len) 138 { 139 ixgbe_t *ixgbe; 140 rx_control_block_t *current_rcb; 141 mblk_t *mp; 142 143 ixgbe = rx_data->rx_ring->ixgbe; 144 current_rcb = rx_data->work_list[index]; 145 146 DMA_SYNC(¤t_rcb->rx_buf, DDI_DMA_SYNC_FORKERNEL); 147 148 if (ixgbe_check_dma_handle(current_rcb->rx_buf.dma_handle) != 149 DDI_FM_OK) { 150 ddi_fm_service_impact(ixgbe->dip, DDI_SERVICE_DEGRADED); 151 } 152 153 /* 154 * Allocate buffer to receive this packet 155 */ 156 mp = allocb(pkt_len + IPHDR_ALIGN_ROOM, 0); 157 if (mp == NULL) { 158 ixgbe_log(ixgbe, "ixgbe_rx_copy: allocate buffer failed"); 159 return (NULL); 160 } 161 162 /* 163 * Copy the data received into the new cluster 164 */ 165 mp->b_rptr += IPHDR_ALIGN_ROOM; 166 bcopy(current_rcb->rx_buf.address, mp->b_rptr, pkt_len); 167 mp->b_wptr = mp->b_rptr + pkt_len; 168 169 return (mp); 170 } 171 172 /* 173 * ixgbe_rx_bind - Use existing DMA buffer to build mblk for receiving. 174 * 175 * This function will use pre-bound DMA buffer to receive the packet 176 * and build mblk that will be sent upstream. 177 */ 178 static mblk_t * 179 ixgbe_rx_bind(ixgbe_rx_data_t *rx_data, uint32_t index, uint32_t pkt_len) 180 { 181 rx_control_block_t *current_rcb; 182 rx_control_block_t *free_rcb; 183 uint32_t free_index; 184 mblk_t *mp; 185 ixgbe_t *ixgbe = rx_data->rx_ring->ixgbe; 186 187 /* 188 * If the free list is empty, we cannot proceed to send 189 * the current DMA buffer upstream. We'll have to return 190 * and use bcopy to process the packet. 191 */ 192 if (ixgbe_atomic_reserve(&rx_data->rcb_free, 1) < 0) 193 return (NULL); 194 195 current_rcb = rx_data->work_list[index]; 196 /* 197 * If the mp of the rx control block is NULL, try to do 198 * desballoc again. 199 */ 200 if (current_rcb->mp == NULL) { 201 current_rcb->mp = desballoc((unsigned char *) 202 current_rcb->rx_buf.address, 203 current_rcb->rx_buf.size, 204 0, ¤t_rcb->free_rtn); 205 /* 206 * If it is failed to built a mblk using the current 207 * DMA buffer, we have to return and use bcopy to 208 * process the packet. 209 */ 210 if (current_rcb->mp == NULL) { 211 atomic_inc_32(&rx_data->rcb_free); 212 return (NULL); 213 } 214 } 215 /* 216 * Sync up the data received 217 */ 218 DMA_SYNC(¤t_rcb->rx_buf, DDI_DMA_SYNC_FORKERNEL); 219 220 if (ixgbe_check_dma_handle(current_rcb->rx_buf.dma_handle) != 221 DDI_FM_OK) { 222 ddi_fm_service_impact(ixgbe->dip, DDI_SERVICE_DEGRADED); 223 } 224 225 mp = current_rcb->mp; 226 current_rcb->mp = NULL; 227 atomic_inc_32(¤t_rcb->ref_cnt); 228 229 mp->b_wptr = mp->b_rptr + pkt_len; 230 mp->b_next = mp->b_cont = NULL; 231 232 /* 233 * Strip off one free rx control block from the free list 234 */ 235 free_index = rx_data->rcb_head; 236 free_rcb = rx_data->free_list[free_index]; 237 ASSERT(free_rcb != NULL); 238 rx_data->free_list[free_index] = NULL; 239 rx_data->rcb_head = NEXT_INDEX(free_index, 1, rx_data->free_list_size); 240 241 /* 242 * Put the rx control block to the work list 243 */ 244 rx_data->work_list[index] = free_rcb; 245 246 return (mp); 247 } 248 249 /* 250 * ixgbe_rx_assoc_hcksum - Check the rx hardware checksum status and associate 251 * the hcksum flags. 252 */ 253 static void 254 ixgbe_rx_assoc_hcksum(mblk_t *mp, uint32_t status_error) 255 { 256 uint32_t hcksum_flags = 0; 257 258 /* 259 * Check TCP/UDP checksum 260 */ 261 if ((status_error & IXGBE_RXD_STAT_L4CS) && 262 !(status_error & IXGBE_RXDADV_ERR_TCPE)) 263 hcksum_flags |= HCK_FULLCKSUM | HCK_FULLCKSUM_OK; 264 265 /* 266 * Check IP Checksum 267 */ 268 if ((status_error & IXGBE_RXD_STAT_IPCS) && 269 !(status_error & IXGBE_RXDADV_ERR_IPE)) 270 hcksum_flags |= HCK_IPV4_HDRCKSUM; 271 272 if (hcksum_flags != 0) { 273 (void) hcksum_assoc(mp, 274 NULL, NULL, 0, 0, 0, 0, hcksum_flags, 0); 275 } 276 } 277 278 /* 279 * ixgbe_ring_rx - Receive the data of one ring. 280 * 281 * This function goes throught h/w descriptor in one specified rx ring, 282 * receives the data if the descriptor status shows the data is ready. 283 * It returns a chain of mblks containing the received data, to be 284 * passed up to mac_rx(). 285 */ 286 mblk_t * 287 ixgbe_ring_rx(ixgbe_rx_ring_t *rx_ring, int poll_bytes) 288 { 289 union ixgbe_adv_rx_desc *current_rbd; 290 rx_control_block_t *current_rcb; 291 mblk_t *mp; 292 mblk_t *mblk_head; 293 mblk_t **mblk_tail; 294 uint32_t rx_next; 295 uint32_t rx_tail; 296 uint32_t pkt_len; 297 uint32_t status_error; 298 uint32_t pkt_num; 299 uint32_t received_bytes; 300 ixgbe_t *ixgbe = rx_ring->ixgbe; 301 ixgbe_rx_data_t *rx_data = rx_ring->rx_data; 302 303 mblk_head = NULL; 304 mblk_tail = &mblk_head; 305 306 /* 307 * Sync the receive descriptors before accepting the packets 308 */ 309 DMA_SYNC(&rx_data->rbd_area, DDI_DMA_SYNC_FORKERNEL); 310 311 if (ixgbe_check_dma_handle(rx_data->rbd_area.dma_handle) != DDI_FM_OK) { 312 ddi_fm_service_impact(ixgbe->dip, DDI_SERVICE_DEGRADED); 313 } 314 315 /* 316 * Get the start point of rx bd ring which should be examined 317 * during this cycle. 318 */ 319 rx_next = rx_data->rbd_next; 320 321 current_rbd = &rx_data->rbd_ring[rx_next]; 322 received_bytes = 0; 323 pkt_num = 0; 324 status_error = current_rbd->wb.upper.status_error; 325 while (status_error & IXGBE_RXD_STAT_DD) { 326 /* 327 * If adapter has found errors, but the error 328 * is hardware checksum error, this does not discard the 329 * packet: let upper layer compute the checksum; 330 * Otherwise discard the packet. 331 */ 332 if ((status_error & IXGBE_RXDADV_ERR_FRAME_ERR_MASK) || 333 !(status_error & IXGBE_RXD_STAT_EOP)) { 334 IXGBE_DEBUG_STAT(rx_ring->stat_frame_error); 335 goto rx_discard; 336 } 337 338 IXGBE_DEBUG_STAT_COND(rx_ring->stat_cksum_error, 339 (status_error & IXGBE_RXDADV_ERR_TCPE) || 340 (status_error & IXGBE_RXDADV_ERR_IPE)); 341 342 pkt_len = current_rbd->wb.upper.length; 343 344 if ((poll_bytes != IXGBE_POLL_NULL) && 345 ((received_bytes + pkt_len) > poll_bytes)) 346 break; 347 348 received_bytes += pkt_len; 349 350 mp = NULL; 351 /* 352 * For packets with length more than the copy threshold, 353 * we'll first try to use the existing DMA buffer to build 354 * an mblk and send the mblk upstream. 355 * 356 * If the first method fails, or the packet length is less 357 * than the copy threshold, we'll allocate a new mblk and 358 * copy the packet data to the new mblk. 359 */ 360 if (pkt_len > ixgbe->rx_copy_thresh) 361 mp = ixgbe_rx_bind(rx_data, rx_next, pkt_len); 362 363 if (mp == NULL) 364 mp = ixgbe_rx_copy(rx_data, rx_next, pkt_len); 365 366 if (mp != NULL) { 367 /* 368 * Check h/w checksum offload status 369 */ 370 if (ixgbe->rx_hcksum_enable) 371 ixgbe_rx_assoc_hcksum(mp, status_error); 372 373 *mblk_tail = mp; 374 mblk_tail = &mp->b_next; 375 } 376 377 rx_discard: 378 /* 379 * Reset rx descriptor read bits 380 */ 381 current_rcb = rx_data->work_list[rx_next]; 382 current_rbd->read.pkt_addr = current_rcb->rx_buf.dma_address; 383 current_rbd->read.hdr_addr = 0; 384 385 rx_next = NEXT_INDEX(rx_next, 1, rx_data->ring_size); 386 387 /* 388 * The receive function is in interrupt context, so here 389 * rx_limit_per_intr is used to avoid doing receiving too long 390 * per interrupt. 391 */ 392 if (++pkt_num > ixgbe->rx_limit_per_intr) { 393 IXGBE_DEBUG_STAT(rx_ring->stat_exceed_pkt); 394 break; 395 } 396 397 current_rbd = &rx_data->rbd_ring[rx_next]; 398 status_error = current_rbd->wb.upper.status_error; 399 } 400 401 DMA_SYNC(&rx_data->rbd_area, DDI_DMA_SYNC_FORDEV); 402 403 rx_data->rbd_next = rx_next; 404 405 /* 406 * Update the h/w tail accordingly 407 */ 408 rx_tail = PREV_INDEX(rx_next, 1, rx_data->ring_size); 409 IXGBE_WRITE_REG(&ixgbe->hw, IXGBE_RDT(rx_ring->index), rx_tail); 410 411 if (ixgbe_check_acc_handle(ixgbe->osdep.reg_handle) != DDI_FM_OK) { 412 ddi_fm_service_impact(ixgbe->dip, DDI_SERVICE_DEGRADED); 413 } 414 415 return (mblk_head); 416 } 417 418 mblk_t * 419 ixgbe_ring_rx_poll(void *arg, int n_bytes) 420 { 421 ixgbe_rx_ring_t *rx_ring = (ixgbe_rx_ring_t *)arg; 422 mblk_t *mp = NULL; 423 424 ASSERT(n_bytes >= 0); 425 426 if (n_bytes == 0) 427 return (mp); 428 429 mutex_enter(&rx_ring->rx_lock); 430 mp = ixgbe_ring_rx(rx_ring, n_bytes); 431 mutex_exit(&rx_ring->rx_lock); 432 433 return (mp); 434 } 435