1 /* 2 * CDDL HEADER START 3 * 4 * Copyright(c) 2007-2008 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: 10 * 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 using or redistributing this file, you may do so under the 15 * License only. No other modification of this header is permitted. 16 * 17 * If applicable, add the following below this CDDL HEADER, with the 18 * fields enclosed by brackets "[]" replaced with your own identifying 19 * information: Portions Copyright [yyyy] [name of copyright owner] 20 * 21 * CDDL HEADER END 22 */ 23 24 /* 25 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms of the CDDL. 27 */ 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include "igb_sw.h" 32 33 /* function prototypes */ 34 static mblk_t *igb_rx_bind(igb_rx_ring_t *, uint32_t, uint32_t); 35 static mblk_t *igb_rx_copy(igb_rx_ring_t *, uint32_t, uint32_t); 36 static void igb_rx_assoc_hcksum(mblk_t *, uint32_t); 37 38 #ifndef IGB_DEBUG 39 #pragma inline(igb_rx_assoc_hcksum) 40 #endif 41 42 43 /* 44 * igb_rx_recycle - the call-back function to reclaim rx buffer 45 * 46 * This function is called when an mp is freed by the user thru 47 * freeb call (Only for mp constructed through desballoc call). 48 * It returns back the freed buffer to the free list. 49 */ 50 void 51 igb_rx_recycle(caddr_t arg) 52 { 53 igb_rx_ring_t *rx_ring; 54 rx_control_block_t *recycle_rcb; 55 uint32_t free_index; 56 57 recycle_rcb = (rx_control_block_t *)(uintptr_t)arg; 58 rx_ring = recycle_rcb->rx_ring; 59 60 if (recycle_rcb->state == RCB_FREE) 61 return; 62 63 recycle_rcb->state = RCB_FREE; 64 65 ASSERT(recycle_rcb->mp == NULL); 66 67 /* 68 * Using the recycled data buffer to generate a new mblk 69 */ 70 recycle_rcb->mp = desballoc((unsigned char *) 71 (recycle_rcb->rx_buf.address - IPHDR_ALIGN_ROOM), 72 (recycle_rcb->rx_buf.size + IPHDR_ALIGN_ROOM), 73 0, &recycle_rcb->free_rtn); 74 if (recycle_rcb->mp != NULL) { 75 recycle_rcb->mp->b_rptr += IPHDR_ALIGN_ROOM; 76 recycle_rcb->mp->b_wptr += IPHDR_ALIGN_ROOM; 77 } 78 79 /* 80 * Put the recycled rx control block into free list 81 */ 82 mutex_enter(&rx_ring->recycle_lock); 83 84 free_index = rx_ring->rcb_tail; 85 ASSERT(rx_ring->free_list[free_index] == NULL); 86 87 rx_ring->free_list[free_index] = recycle_rcb; 88 rx_ring->rcb_tail = NEXT_INDEX(free_index, 1, rx_ring->free_list_size); 89 90 mutex_exit(&rx_ring->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_ring->rcb_free); 98 ASSERT(rx_ring->rcb_free <= rx_ring->free_list_size); 99 } 100 101 /* 102 * igb_rx_copy - Use copy to process the received packet 103 * 104 * This function will use bcopy to process the packet 105 * and send the copied packet upstream 106 */ 107 static mblk_t * 108 igb_rx_copy(igb_rx_ring_t *rx_ring, uint32_t index, uint32_t pkt_len) 109 { 110 rx_control_block_t *current_rcb; 111 mblk_t *mp; 112 igb_t *igb = rx_ring->igb; 113 114 current_rcb = rx_ring->work_list[index]; 115 116 DMA_SYNC(¤t_rcb->rx_buf, DDI_DMA_SYNC_FORKERNEL); 117 118 if (igb_check_dma_handle( 119 current_rcb->rx_buf.dma_handle) != DDI_FM_OK) { 120 ddi_fm_service_impact(igb->dip, DDI_SERVICE_DEGRADED); 121 } 122 123 /* 124 * Allocate buffer to receive this packet 125 */ 126 mp = allocb(pkt_len + IPHDR_ALIGN_ROOM, 0); 127 if (mp == NULL) { 128 igb_log(rx_ring->igb, "igb_rx_copy: allocate buffer failed"); 129 return (NULL); 130 } 131 132 /* 133 * Copy the data received into the new cluster 134 */ 135 mp->b_rptr += IPHDR_ALIGN_ROOM; 136 bcopy(current_rcb->rx_buf.address, mp->b_rptr, pkt_len); 137 mp->b_wptr = mp->b_rptr + pkt_len; 138 139 return (mp); 140 } 141 142 /* 143 * igb_rx_bind - Use existing DMA buffer to build mblk for receiving 144 * 145 * This function will use pre-bound DMA buffer to receive the packet 146 * and build mblk that will be sent upstream. 147 */ 148 static mblk_t * 149 igb_rx_bind(igb_rx_ring_t *rx_ring, uint32_t index, uint32_t pkt_len) 150 { 151 rx_control_block_t *current_rcb; 152 rx_control_block_t *free_rcb; 153 uint32_t free_index; 154 mblk_t *mp; 155 igb_t *igb = rx_ring->igb; 156 157 /* 158 * If the free list is empty, we cannot proceed to send 159 * the current DMA buffer upstream. We'll have to return 160 * and use bcopy to process the packet. 161 */ 162 if (igb_atomic_reserve(&rx_ring->rcb_free, 1) < 0) 163 return (NULL); 164 165 current_rcb = rx_ring->work_list[index]; 166 /* 167 * If the mp of the rx control block is NULL, try to do 168 * desballoc again. 169 */ 170 if (current_rcb->mp == NULL) { 171 current_rcb->mp = desballoc((unsigned char *) 172 (current_rcb->rx_buf.address - IPHDR_ALIGN_ROOM), 173 (current_rcb->rx_buf.size + IPHDR_ALIGN_ROOM), 174 0, ¤t_rcb->free_rtn); 175 /* 176 * If it is failed to built a mblk using the current 177 * DMA buffer, we have to return and use bcopy to 178 * process the packet. 179 */ 180 if (current_rcb->mp == NULL) { 181 atomic_inc_32(&rx_ring->rcb_free); 182 return (NULL); 183 } 184 } 185 /* 186 * Sync up the data received 187 */ 188 DMA_SYNC(¤t_rcb->rx_buf, DDI_DMA_SYNC_FORKERNEL); 189 190 if (igb_check_dma_handle( 191 current_rcb->rx_buf.dma_handle) != DDI_FM_OK) { 192 ddi_fm_service_impact(igb->dip, DDI_SERVICE_DEGRADED); 193 } 194 195 mp = current_rcb->mp; 196 current_rcb->mp = NULL; 197 current_rcb->state = RCB_SENDUP; 198 199 mp->b_wptr = mp->b_rptr + pkt_len; 200 mp->b_next = mp->b_cont = NULL; 201 202 /* 203 * Strip off one free rx control block from the free list 204 */ 205 free_index = rx_ring->rcb_head; 206 free_rcb = rx_ring->free_list[free_index]; 207 ASSERT(free_rcb != NULL); 208 rx_ring->free_list[free_index] = NULL; 209 rx_ring->rcb_head = NEXT_INDEX(free_index, 1, rx_ring->free_list_size); 210 211 /* 212 * Put the rx control block to the work list 213 */ 214 rx_ring->work_list[index] = free_rcb; 215 216 return (mp); 217 } 218 219 /* 220 * igb_rx_assoc_hcksum 221 * 222 * Check the rx hardware checksum status and associate the hcksum flags 223 */ 224 static void 225 igb_rx_assoc_hcksum(mblk_t *mp, uint32_t status_error) 226 { 227 uint32_t hcksum_flags = 0; 228 229 /* Ignore Checksum Indication */ 230 if (status_error & E1000_RXD_STAT_IXSM) 231 return; 232 233 /* 234 * Check TCP/UDP checksum 235 */ 236 if (((status_error & E1000_RXD_STAT_TCPCS) || 237 (status_error & E1000_RXD_STAT_UDPCS)) && 238 !(status_error & E1000_RXDEXT_STATERR_TCPE)) 239 hcksum_flags |= HCK_FULLCKSUM | HCK_FULLCKSUM_OK; 240 241 /* 242 * Check IP Checksum 243 */ 244 if ((status_error & E1000_RXD_STAT_IPCS) && 245 !(status_error & E1000_RXDEXT_STATERR_IPE)) 246 hcksum_flags |= HCK_IPV4_HDRCKSUM; 247 248 if (hcksum_flags != 0) { 249 (void) hcksum_assoc(mp, 250 NULL, NULL, 0, 0, 0, 0, hcksum_flags, 0); 251 } 252 } 253 254 /* 255 * igb_rx - Receive the data of one ring 256 * 257 * This function goes throught h/w descriptor in one specified rx ring, 258 * receives the data if the descriptor status shows the data is ready. 259 * It returns a chain of mblks containing the received data, to be 260 * passed up to mac_rx(). 261 */ 262 mblk_t * 263 igb_rx(igb_rx_ring_t *rx_ring) 264 { 265 union e1000_adv_rx_desc *current_rbd; 266 rx_control_block_t *current_rcb; 267 mblk_t *mp; 268 mblk_t *mblk_head; 269 mblk_t **mblk_tail; 270 uint32_t rx_next; 271 uint32_t rx_tail; 272 uint32_t pkt_len; 273 uint32_t status_error; 274 uint32_t pkt_num; 275 igb_t *igb = rx_ring->igb; 276 277 mblk_head = NULL; 278 mblk_tail = &mblk_head; 279 280 /* 281 * Sync the receive descriptors before 282 * accepting the packets 283 */ 284 DMA_SYNC(&rx_ring->rbd_area, DDI_DMA_SYNC_FORKERNEL); 285 286 if (igb_check_dma_handle( 287 rx_ring->rbd_area.dma_handle) != DDI_FM_OK) { 288 ddi_fm_service_impact(igb->dip, DDI_SERVICE_DEGRADED); 289 } 290 291 /* 292 * Get the start point of rx bd ring which should be examined 293 * during this cycle. 294 */ 295 rx_next = rx_ring->rbd_next; 296 297 current_rbd = &rx_ring->rbd_ring[rx_next]; 298 pkt_num = 0; 299 status_error = current_rbd->wb.upper.status_error; 300 while (status_error & E1000_RXD_STAT_DD) { 301 /* 302 * If hardware has found the errors, but the error 303 * is hardware checksum error, here does not discard the 304 * packet, and let upper layer compute the checksum; 305 * Otherwise discard the packet. 306 */ 307 if ((status_error & E1000_RXDEXT_ERR_FRAME_ERR_MASK) || 308 !(status_error & E1000_RXD_STAT_EOP)) { 309 IGB_DEBUG_STAT(rx_ring->stat_frame_error); 310 goto rx_discard; 311 } 312 313 IGB_DEBUG_STAT_COND(rx_ring->stat_cksum_error, 314 (status_error & E1000_RXDEXT_STATERR_TCPE) || 315 (status_error & E1000_RXDEXT_STATERR_IPE)); 316 317 pkt_len = current_rbd->wb.upper.length; 318 mp = NULL; 319 /* 320 * For packets with length more than the copy threshold, 321 * we'll firstly try to use the existed DMA buffer to built 322 * a mblk and send the mblk upstream. 323 * 324 * If the first method fails, or the packet length is less 325 * than the copy threshold, we'll allocate a new mblk and 326 * copy the packet data to the mblk. 327 */ 328 if (pkt_len > rx_ring->copy_thresh) 329 mp = igb_rx_bind(rx_ring, rx_next, pkt_len); 330 331 if (mp == NULL) 332 mp = igb_rx_copy(rx_ring, rx_next, pkt_len); 333 334 if (mp != NULL) { 335 /* 336 * Check h/w checksum offload status 337 */ 338 if (igb->rx_hcksum_enable) 339 igb_rx_assoc_hcksum(mp, status_error); 340 341 *mblk_tail = mp; 342 mblk_tail = &mp->b_next; 343 } 344 345 rx_discard: 346 /* 347 * Reset rx descriptor read bits 348 */ 349 current_rcb = rx_ring->work_list[rx_next]; 350 current_rbd->read.pkt_addr = current_rcb->rx_buf.dma_address; 351 current_rbd->read.hdr_addr = 0; 352 353 rx_next = NEXT_INDEX(rx_next, 1, rx_ring->ring_size); 354 355 /* 356 * The receive function is in interrupt context, so here 357 * limit_per_intr is used to avoid doing receiving too long 358 * per interrupt. 359 */ 360 if (++pkt_num > rx_ring->limit_per_intr) { 361 IGB_DEBUG_STAT(rx_ring->stat_exceed_pkt); 362 break; 363 } 364 365 current_rbd = &rx_ring->rbd_ring[rx_next]; 366 status_error = current_rbd->wb.upper.status_error; 367 } 368 369 DMA_SYNC(&rx_ring->rbd_area, DDI_DMA_SYNC_FORDEV); 370 371 rx_ring->rbd_next = rx_next; 372 373 /* 374 * Update the h/w tail accordingly 375 */ 376 rx_tail = PREV_INDEX(rx_next, 1, rx_ring->ring_size); 377 378 E1000_WRITE_REG(&igb->hw, E1000_RDT(rx_ring->index), rx_tail); 379 380 if (igb_check_acc_handle(igb->osdep.reg_handle) != DDI_FM_OK) { 381 ddi_fm_service_impact(igb->dip, DDI_SERVICE_DEGRADED); 382 } 383 384 return (mblk_head); 385 } 386