drivers/infiniband/hw/nes/nes_mgt.c

   1 /*
   2  * Copyright (c) 2006 - 2011 Intel-NE, Inc.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33
  34 #include <linux/skbuff.h>
  35 #include <linux/etherdevice.h>
  36 #include <linux/kthread.h>
  37 #include <linux/ip.h>
  38 #include <linux/tcp.h>
  39 #include <net/tcp.h>
  40 #include "nes.h"
  41 #include "nes_mgt.h"
  42
  43 atomic_t pau_qps_created;
  44 atomic_t pau_qps_destroyed;
  45
  46 static void nes_replenish_mgt_rq(struct nes_vnic_mgt *mgtvnic)
  47 {
  48         unsigned long flags;
  49         dma_addr_t bus_address;
  50         struct sk_buff *skb;
  51         struct nes_hw_nic_rq_wqe *nic_rqe;
  52         struct nes_hw_mgt *nesmgt;
  53         struct nes_device *nesdev;
  54         struct nes_rskb_cb *cb;
  55         u32 rx_wqes_posted = 0;
  56
  57         nesmgt = &mgtvnic->mgt;
  58         nesdev = mgtvnic->nesvnic->nesdev;
  59         spin_lock_irqsave(&nesmgt->rq_lock, flags);
  60         if (nesmgt->replenishing_rq != 0) {
  61                 if (((nesmgt->rq_size - 1) == atomic_read(&mgtvnic->rx_skbs_needed)) &&
  62                     (atomic_read(&mgtvnic->rx_skb_timer_running) == 0)) {
  63                         atomic_set(&mgtvnic->rx_skb_timer_running, 1);
  64                         spin_unlock_irqrestore(&nesmgt->rq_lock, flags);
  65                         mgtvnic->rq_wqes_timer.expires = jiffies + (HZ / 2);      /* 1/2 second */
  66                         add_timer(&mgtvnic->rq_wqes_timer);
  67                 } else {
  68                         spin_unlock_irqrestore(&nesmgt->rq_lock, flags);
  69                 }
  70                 return;
  71         }
  72         nesmgt->replenishing_rq = 1;
  73         spin_unlock_irqrestore(&nesmgt->rq_lock, flags);
  74         do {
  75                 skb = dev_alloc_skb(mgtvnic->nesvnic->max_frame_size);
  76                 if (skb) {
  77                         skb->dev = mgtvnic->nesvnic->netdev;
  78
  79                         bus_address = pci_map_single(nesdev->pcidev,
  80                                                      skb->data, mgtvnic->nesvnic->max_frame_size, PCI_DMA_FROMDEVICE);
  81                         cb = (struct nes_rskb_cb *)&skb->cb[0];
  82                         cb->busaddr = bus_address;
  83                         cb->maplen = mgtvnic->nesvnic->max_frame_size;
  84
  85                         nic_rqe = &nesmgt->rq_vbase[mgtvnic->mgt.rq_head];
  86                         nic_rqe->wqe_words[NES_NIC_RQ_WQE_LENGTH_1_0_IDX] =
  87                                 cpu_to_le32(mgtvnic->nesvnic->max_frame_size);
  88                         nic_rqe->wqe_words[NES_NIC_RQ_WQE_LENGTH_3_2_IDX] = 0;
  89                         nic_rqe->wqe_words[NES_NIC_RQ_WQE_FRAG0_LOW_IDX] =
  90                                 cpu_to_le32((u32)bus_address);
  91                         nic_rqe->wqe_words[NES_NIC_RQ_WQE_FRAG0_HIGH_IDX] =
  92                                 cpu_to_le32((u32)((u64)bus_address >> 32));
  93                         nesmgt->rx_skb[nesmgt->rq_head] = skb;
  94                         nesmgt->rq_head++;
  95                         nesmgt->rq_head &= nesmgt->rq_size - 1;
  96                         atomic_dec(&mgtvnic->rx_skbs_needed);
  97                         barrier();
  98                         if (++rx_wqes_posted == 255) {
  99                                 nes_write32(nesdev->regs + NES_WQE_ALLOC, (rx_wqes_posted << 24) | nesmgt->qp_id);
 100                                 rx_wqes_posted = 0;
 101                         }
 102                 } else {
 103                         spin_lock_irqsave(&nesmgt->rq_lock, flags);
 104                         if (((nesmgt->rq_size - 1) == atomic_read(&mgtvnic->rx_skbs_needed)) &&
 105                             (atomic_read(&mgtvnic->rx_skb_timer_running) == 0)) {
 106                                 atomic_set(&mgtvnic->rx_skb_timer_running, 1);
 107                                 spin_unlock_irqrestore(&nesmgt->rq_lock, flags);
 108                                 mgtvnic->rq_wqes_timer.expires = jiffies + (HZ / 2);      /* 1/2 second */
 109                                 add_timer(&mgtvnic->rq_wqes_timer);
 110                         } else {
 111                                 spin_unlock_irqrestore(&nesmgt->rq_lock, flags);
 112                         }
 113                         break;
 114                 }
 115         } while (atomic_read(&mgtvnic->rx_skbs_needed));
 116         barrier();
 117         if (rx_wqes_posted)
 118                 nes_write32(nesdev->regs + NES_WQE_ALLOC, (rx_wqes_posted << 24) | nesmgt->qp_id);
 119         nesmgt->replenishing_rq = 0;
 120 }
 121
 122 /**
 123  * nes_mgt_rq_wqes_timeout
 124  */
 125 static void nes_mgt_rq_wqes_timeout(struct timer_list *t)
 126 {
 127         struct nes_vnic_mgt *mgtvnic = from_timer(mgtvnic, t,
 128                                                        rq_wqes_timer);
 129
 130         atomic_set(&mgtvnic->rx_skb_timer_running, 0);
 131         if (atomic_read(&mgtvnic->rx_skbs_needed))
 132                 nes_replenish_mgt_rq(mgtvnic);
 133 }
 134
 135 /**
 136  * nes_mgt_free_skb - unmap and free skb
 137  */
 138 static void nes_mgt_free_skb(struct nes_device *nesdev, struct sk_buff *skb, u32 dir)
 139 {
 140         struct nes_rskb_cb *cb;
 141
 142         cb = (struct nes_rskb_cb *)&skb->cb[0];
 143         pci_unmap_single(nesdev->pcidev, cb->busaddr, cb->maplen, dir);
 144         cb->busaddr = 0;
 145         dev_kfree_skb_any(skb);
 146 }
 147
 148 /**
 149  * nes_download_callback - handle download completions
 150  */
 151 static void nes_download_callback(struct nes_device *nesdev, struct nes_cqp_request *cqp_request)
 152 {
 153         struct pau_fpdu_info *fpdu_info = cqp_request->cqp_callback_pointer;
 154         struct nes_qp *nesqp = fpdu_info->nesqp;
 155         struct sk_buff *skb;
 156         int i;
 157
 158         for (i = 0; i < fpdu_info->frag_cnt; i++) {
 159                 skb = fpdu_info->frags[i].skb;
 160                 if (fpdu_info->frags[i].cmplt) {
 161                         nes_mgt_free_skb(nesdev, skb, PCI_DMA_TODEVICE);
 162                         nes_rem_ref_cm_node(nesqp->cm_node);
 163                 }
 164         }
 165
 166         if (fpdu_info->hdr_vbase)
 167                 pci_free_consistent(nesdev->pcidev, fpdu_info->hdr_len,
 168                                     fpdu_info->hdr_vbase, fpdu_info->hdr_pbase);
 169         kfree(fpdu_info);
 170 }
 171
 172 /**
 173  * nes_get_seq - Get the seq, ack_seq and window from the packet
 174  */
 175 static u32 nes_get_seq(struct sk_buff *skb, u32 *ack, u16 *wnd, u32 *fin_rcvd, u32 *rst_rcvd)
 176 {
 177         struct nes_rskb_cb *cb = (struct nes_rskb_cb *)&skb->cb[0];
 178         struct iphdr *iph = (struct iphdr *)(cb->data_start + ETH_HLEN);
 179         struct tcphdr *tcph = (struct tcphdr *)(((char *)iph) + (4 * iph->ihl));
 180
 181         *ack = be32_to_cpu(tcph->ack_seq);
 182         *wnd = be16_to_cpu(tcph->window);
 183         *fin_rcvd = tcph->fin;
 184         *rst_rcvd = tcph->rst;
 185         return be32_to_cpu(tcph->seq);
 186 }
 187
 188 /**
 189  * nes_get_next_skb - Get the next skb based on where current skb is in the queue
 190  */
 191 static struct sk_buff *nes_get_next_skb(struct nes_device *nesdev, struct nes_qp *nesqp,
 192                                         struct sk_buff *skb, u32 nextseq, u32 *ack,
 193                                         u16 *wnd, u32 *fin_rcvd, u32 *rst_rcvd)
 194 {
 195         u32 seq;
 196         bool processacks;
 197         struct sk_buff *old_skb;
 198
 199         if (skb) {
 200                 /* Continue processing fpdu */
 201                 skb = skb_peek_next(skb, &nesqp->pau_list);
 202                 if (!skb)
 203                         goto out;
 204                 processacks = false;
 205         } else {
 206                 /* Starting a new one */
 207                 if (skb_queue_empty(&nesqp->pau_list))
 208                         goto out;
 209                 skb = skb_peek(&nesqp->pau_list);
 210                 processacks = true;
 211         }
 212
 213         while (1) {
 214                 if (skb_queue_empty(&nesqp->pau_list))
 215                         goto out;
 216
 217                 seq = nes_get_seq(skb, ack, wnd, fin_rcvd, rst_rcvd);
 218                 if (seq == nextseq) {
 219                         if (skb->len || processacks)
 220                                 break;
 221                 } else if (after(seq, nextseq)) {
 222                         goto out;
 223                 }
 224
 225                 old_skb = skb;
 226                 skb = skb_peek_next(skb, &nesqp->pau_list);
 227                 skb_unlink(old_skb, &nesqp->pau_list);
 228                 nes_mgt_free_skb(nesdev, old_skb, PCI_DMA_TODEVICE);
 229                 nes_rem_ref_cm_node(nesqp->cm_node);
 230                 if (!skb)
 231                         goto out;
 232         }
 233         return skb;
 234
 235 out:
 236         return NULL;
 237 }
 238
 239 /**
 240  * get_fpdu_info - Find the next complete fpdu and return its fragments.
 241  */
 242 static int get_fpdu_info(struct nes_device *nesdev, struct nes_qp *nesqp,
 243                          struct pau_fpdu_info **pau_fpdu_info)
 244 {
 245         struct sk_buff *skb;
 246         struct iphdr *iph;
 247         struct tcphdr *tcph;
 248         struct nes_rskb_cb *cb;
 249         struct pau_fpdu_info *fpdu_info = NULL;
 250         struct pau_fpdu_frag frags[MAX_FPDU_FRAGS];
 251         u32 fpdu_len = 0;
 252         u32 tmp_len;
 253         int frag_cnt = 0;
 254         u32 tot_len;
 255         u32 frag_tot;
 256         u32 ack;
 257         u32 fin_rcvd;
 258         u32 rst_rcvd;
 259         u16 wnd;
 260         int i;
 261         int rc = 0;
 262
 263         *pau_fpdu_info = NULL;
 264
 265         skb = nes_get_next_skb(nesdev, nesqp, NULL, nesqp->pau_rcv_nxt, &ack, &wnd, &fin_rcvd, &rst_rcvd);
 266         if (!skb)
 267                 goto out;
 268
 269         cb = (struct nes_rskb_cb *)&skb->cb[0];
 270         if (skb->len) {
 271                 fpdu_len = be16_to_cpu(*(__be16 *) skb->data) + MPA_FRAMING;
 272                 fpdu_len = (fpdu_len + 3) & 0xfffffffc;
 273                 tmp_len = fpdu_len;
 274
 275                 /* See if we have all of the fpdu */
 276                 frag_tot = 0;
 277                 memset(&frags, 0, sizeof frags);
 278                 for (i = 0; i < MAX_FPDU_FRAGS; i++) {
 279                         frags[i].physaddr = cb->busaddr;
 280                         frags[i].physaddr += skb->data - cb->data_start;
 281                         frags[i].frag_len = min(tmp_len, skb->len);
 282                         frags[i].skb = skb;
 283                         frags[i].cmplt = (skb->len == frags[i].frag_len);
 284                         frag_tot += frags[i].frag_len;
 285                         frag_cnt++;
 286
 287                         tmp_len -= frags[i].frag_len;
 288                         if (tmp_len == 0)
 289                                 break;
 290
 291                         skb = nes_get_next_skb(nesdev, nesqp, skb,
 292                                                nesqp->pau_rcv_nxt + frag_tot, &ack, &wnd, &fin_rcvd, &rst_rcvd);
 293                         if (!skb)
 294                                 goto out;
 295                         if (rst_rcvd) {
 296                                 /* rst received in the middle of fpdu */
 297                                 for (; i >= 0; i--) {
 298                                         skb_unlink(frags[i].skb, &nesqp->pau_list);
 299                                         nes_mgt_free_skb(nesdev, frags[i].skb, PCI_DMA_TODEVICE);
 300                                 }
 301                                 cb = (struct nes_rskb_cb *)&skb->cb[0];
 302                                 frags[0].physaddr = cb->busaddr;
 303                                 frags[0].physaddr += skb->data - cb->data_start;
 304                                 frags[0].frag_len = skb->len;
 305                                 frags[0].skb = skb;
 306                                 frags[0].cmplt = true;
 307                                 frag_cnt = 1;
 308                                 break;
 309                         }
 310
 311                         cb = (struct nes_rskb_cb *)&skb->cb[0];
 312                 }
 313         } else {
 314                 /* no data */
 315                 frags[0].physaddr = cb->busaddr;
 316                 frags[0].frag_len = 0;
 317                 frags[0].skb = skb;
 318                 frags[0].cmplt = true;
 319                 frag_cnt = 1;
 320         }
 321
 322         /* Found one */
 323         fpdu_info = kzalloc(sizeof(*fpdu_info), GFP_ATOMIC);
 324         if (!fpdu_info) {
 325                 rc = -ENOMEM;
 326                 goto out;
 327         }
 328
 329         fpdu_info->cqp_request = nes_get_cqp_request(nesdev);
 330         if (fpdu_info->cqp_request == NULL) {
 331                 nes_debug(NES_DBG_PAU, "Failed to get a cqp_request.\n");
 332                 rc = -ENOMEM;
 333                 goto out;
 334         }
 335
 336         cb = (struct nes_rskb_cb *)&frags[0].skb->cb[0];
 337         iph = (struct iphdr *)(cb->data_start + ETH_HLEN);
 338         tcph = (struct tcphdr *)(((char *)iph) + (4 * iph->ihl));
 339         fpdu_info->hdr_len = (((unsigned char *)tcph) + 4 * (tcph->doff)) - cb->data_start;
 340         fpdu_info->data_len = fpdu_len;
 341         tot_len = fpdu_info->hdr_len + fpdu_len - ETH_HLEN;
 342
 343         if (frags[0].cmplt) {
 344                 fpdu_info->hdr_pbase = cb->busaddr;
 345                 fpdu_info->hdr_vbase = NULL;
 346         } else {
 347                 fpdu_info->hdr_vbase = pci_alloc_consistent(nesdev->pcidev,
 348                                                             fpdu_info->hdr_len, &fpdu_info->hdr_pbase);
 349                 if (!fpdu_info->hdr_vbase) {
 350                         nes_debug(NES_DBG_PAU, "Unable to allocate memory for pau first frag\n");
 351                         rc = -ENOMEM;
 352                         goto out;
 353                 }
 354
 355                 /* Copy hdrs, adjusting len and seqnum */
 356                 memcpy(fpdu_info->hdr_vbase, cb->data_start, fpdu_info->hdr_len);
 357                 iph = (struct iphdr *)(fpdu_info->hdr_vbase + ETH_HLEN);
 358                 tcph = (struct tcphdr *)(((char *)iph) + (4 * iph->ihl));
 359         }
 360
 361         iph->tot_len = cpu_to_be16(tot_len);
 362         iph->saddr = cpu_to_be32(0x7f000001);
 363
 364         tcph->seq = cpu_to_be32(nesqp->pau_rcv_nxt);
 365         tcph->ack_seq = cpu_to_be32(ack);
 366         tcph->window = cpu_to_be16(wnd);
 367
 368         nesqp->pau_rcv_nxt += fpdu_len + fin_rcvd;
 369
 370         memcpy(fpdu_info->frags, frags, sizeof(fpdu_info->frags));
 371         fpdu_info->frag_cnt = frag_cnt;
 372         fpdu_info->nesqp = nesqp;
 373         *pau_fpdu_info = fpdu_info;
 374
 375         /* Update skb's for next pass */
 376         for (i = 0; i < frag_cnt; i++) {
 377                 cb = (struct nes_rskb_cb *)&frags[i].skb->cb[0];
 378                 skb_pull(frags[i].skb, frags[i].frag_len);
 379
 380                 if (frags[i].skb->len == 0) {
 381                         /* Pull skb off the list - it will be freed in the callback */
 382                         if (!skb_queue_empty(&nesqp->pau_list))
 383                                 skb_unlink(frags[i].skb, &nesqp->pau_list);
 384                 } else {
 385                         /* Last skb still has data so update the seq */
 386                         iph = (struct iphdr *)(cb->data_start + ETH_HLEN);
 387                         tcph = (struct tcphdr *)(((char *)iph) + (4 * iph->ihl));
 388                         tcph->seq = cpu_to_be32(nesqp->pau_rcv_nxt);
 389                 }
 390         }
 391
 392 out:
 393         if (rc) {
 394                 if (fpdu_info) {
 395                         if (fpdu_info->cqp_request)
 396                                 nes_put_cqp_request(nesdev, fpdu_info->cqp_request);
 397                         kfree(fpdu_info);
 398                 }
 399         }
 400         return rc;
 401 }
 402
 403 /**
 404  * forward_fpdu - send complete fpdus, one at a time
 405  */
 406 static int forward_fpdus(struct nes_vnic *nesvnic, struct nes_qp *nesqp)
 407 {
 408         struct nes_device *nesdev = nesvnic->nesdev;
 409         struct pau_fpdu_info *fpdu_info;
 410         struct nes_hw_cqp_wqe *cqp_wqe;
 411         struct nes_cqp_request *cqp_request;
 412         unsigned long flags;
 413         u64 u64tmp;
 414         u32 u32tmp;
 415         int rc;
 416
 417         while (1) {
 418                 spin_lock_irqsave(&nesqp->pau_lock, flags);
 419                 rc = get_fpdu_info(nesdev, nesqp, &fpdu_info);
 420                 if (rc || (fpdu_info == NULL)) {
 421                         spin_unlock_irqrestore(&nesqp->pau_lock, flags);
 422                         return rc;
 423                 }
 424
 425                 cqp_request = fpdu_info->cqp_request;
 426                 cqp_wqe = &cqp_request->cqp_wqe;
 427                 nes_fill_init_cqp_wqe(cqp_wqe, nesdev);
 428                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_CQP_WQE_DL_OPCODE_IDX,
 429                                     NES_CQP_DOWNLOAD_SEGMENT |
 430                                     (((u32)nesvnic->logical_port) << NES_CQP_OP_LOGICAL_PORT_SHIFT));
 431
 432                 u32tmp = fpdu_info->hdr_len << 16;
 433                 u32tmp |= fpdu_info->hdr_len + (u32)fpdu_info->data_len;
 434                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_CQP_WQE_DL_LENGTH_0_TOTAL_IDX,
 435                                     u32tmp);
 436
 437                 u32tmp = (fpdu_info->frags[1].frag_len << 16) | fpdu_info->frags[0].frag_len;
 438                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_NIC_SQ_WQE_LENGTH_2_1_IDX,
 439                                     u32tmp);
 440
 441                 u32tmp = (fpdu_info->frags[3].frag_len << 16) | fpdu_info->frags[2].frag_len;
 442                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_NIC_SQ_WQE_LENGTH_4_3_IDX,
 443                                     u32tmp);
 444
 445                 u64tmp = (u64)fpdu_info->hdr_pbase;
 446                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_NIC_SQ_WQE_FRAG0_LOW_IDX,
 447                                     lower_32_bits(u64tmp));
 448                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_NIC_SQ_WQE_FRAG0_HIGH_IDX,
 449                                     upper_32_bits(u64tmp));
 450
 451                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_NIC_SQ_WQE_FRAG1_LOW_IDX,
 452                                     lower_32_bits(fpdu_info->frags[0].physaddr));
 453                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_NIC_SQ_WQE_FRAG1_HIGH_IDX,
 454                                     upper_32_bits(fpdu_info->frags[0].physaddr));
 455
 456                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_NIC_SQ_WQE_FRAG2_LOW_IDX,
 457                                     lower_32_bits(fpdu_info->frags[1].physaddr));
 458                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_NIC_SQ_WQE_FRAG2_HIGH_IDX,
 459                                     upper_32_bits(fpdu_info->frags[1].physaddr));
 460
 461                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_NIC_SQ_WQE_FRAG3_LOW_IDX,
 462                                     lower_32_bits(fpdu_info->frags[2].physaddr));
 463                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_NIC_SQ_WQE_FRAG3_HIGH_IDX,
 464                                     upper_32_bits(fpdu_info->frags[2].physaddr));
 465
 466                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_NIC_SQ_WQE_FRAG4_LOW_IDX,
 467                                     lower_32_bits(fpdu_info->frags[3].physaddr));
 468                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_NIC_SQ_WQE_FRAG4_HIGH_IDX,
 469                                     upper_32_bits(fpdu_info->frags[3].physaddr));
 470
 471                 cqp_request->cqp_callback_pointer = fpdu_info;
 472                 cqp_request->callback = 1;
 473                 cqp_request->cqp_callback = nes_download_callback;
 474
 475                 atomic_set(&cqp_request->refcount, 1);
 476                 nes_post_cqp_request(nesdev, cqp_request);
 477                 spin_unlock_irqrestore(&nesqp->pau_lock, flags);
 478         }
 479
 480         return 0;
 481 }
 482
 483 static void process_fpdus(struct nes_vnic *nesvnic, struct nes_qp *nesqp)
 484 {
 485         int again = 1;
 486         unsigned long flags;
 487
 488         do {
 489                 /* Ignore rc - if it failed, tcp retries will cause it to try again */
 490                 forward_fpdus(nesvnic, nesqp);
 491
 492                 spin_lock_irqsave(&nesqp->pau_lock, flags);
 493                 if (nesqp->pau_pending) {
 494                         nesqp->pau_pending = 0;
 495                 } else {
 496                         nesqp->pau_busy = 0;
 497                         again = 0;
 498                 }
 499
 500                 spin_unlock_irqrestore(&nesqp->pau_lock, flags);
 501         } while (again);
 502 }
 503
 504 /**
 505  * queue_fpdus - Handle fpdu's that hw passed up to sw
 506  */
 507 static void queue_fpdus(struct sk_buff *skb, struct nes_vnic *nesvnic, struct nes_qp *nesqp)
 508 {
 509         struct sk_buff *tmpskb;
 510         struct nes_rskb_cb *cb;
 511         struct iphdr *iph;
 512         struct tcphdr *tcph;
 513         unsigned char *tcph_end;
 514         u32 rcv_nxt;
 515         u32 rcv_wnd;
 516         u32 seqnum;
 517         u32 len;
 518         bool process_it = false;
 519         unsigned long flags;
 520
 521         /* Move data ptr to after tcp header */
 522         iph = (struct iphdr *)skb->data;
 523         tcph = (struct tcphdr *)(((char *)iph) + (4 * iph->ihl));
 524         seqnum = be32_to_cpu(tcph->seq);
 525         tcph_end = (((char *)tcph) + (4 * tcph->doff));
 526
 527         len = be16_to_cpu(iph->tot_len);
 528         if (skb->len > len)
 529                 skb_trim(skb, len);
 530         skb_pull(skb, tcph_end - skb->data);
 531
 532         /* Initialize tracking values */
 533         cb = (struct nes_rskb_cb *)&skb->cb[0];
 534         cb->seqnum = seqnum;
 535
 536         /* Make sure data is in the receive window */
 537         rcv_nxt = nesqp->pau_rcv_nxt;
 538         rcv_wnd = le32_to_cpu(nesqp->nesqp_context->rcv_wnd);
 539         if (!between(seqnum, rcv_nxt, (rcv_nxt + rcv_wnd))) {
 540                 nes_mgt_free_skb(nesvnic->nesdev, skb, PCI_DMA_TODEVICE);
 541                 nes_rem_ref_cm_node(nesqp->cm_node);
 542                 return;
 543         }
 544
 545         spin_lock_irqsave(&nesqp->pau_lock, flags);
 546
 547         if (nesqp->pau_busy)
 548                 nesqp->pau_pending = 1;
 549         else
 550                 nesqp->pau_busy = 1;
 551
 552         /* Queue skb by sequence number */
 553         if (skb_queue_len(&nesqp->pau_list) == 0) {
 554                 __skb_queue_head(&nesqp->pau_list, skb);
 555         } else {
 556                 skb_queue_walk(&nesqp->pau_list, tmpskb) {
 557                         cb = (struct nes_rskb_cb *)&tmpskb->cb[0];
 558                         if (before(seqnum, cb->seqnum))
 559                                 break;
 560                 }
 561                 __skb_insert(skb, tmpskb->prev, tmpskb, &nesqp->pau_list);
 562         }
 563         if (nesqp->pau_state == PAU_READY)
 564                 process_it = true;
 565         spin_unlock_irqrestore(&nesqp->pau_lock, flags);
 566
 567         if (process_it)
 568                 process_fpdus(nesvnic, nesqp);
 569
 570         return;
 571 }
 572
 573 /**
 574  * mgt_thread - Handle mgt skbs in a safe context
 575  */
 576 static int mgt_thread(void *context)
 577 {
 578         struct nes_vnic *nesvnic = context;
 579         struct sk_buff *skb;
 580         struct nes_rskb_cb *cb;
 581
 582         while (!kthread_should_stop()) {
 583                 wait_event_interruptible(nesvnic->mgt_wait_queue,
 584                                          skb_queue_len(&nesvnic->mgt_skb_list) || kthread_should_stop());
 585                 while ((skb_queue_len(&nesvnic->mgt_skb_list)) && !kthread_should_stop()) {
 586                         skb = skb_dequeue(&nesvnic->mgt_skb_list);
 587                         cb = (struct nes_rskb_cb *)&skb->cb[0];
 588                         cb->data_start = skb->data - ETH_HLEN;
 589                         cb->busaddr = pci_map_single(nesvnic->nesdev->pcidev, cb->data_start,
 590                                                      nesvnic->max_frame_size, PCI_DMA_TODEVICE);
 591                         queue_fpdus(skb, nesvnic, cb->nesqp);
 592                 }
 593         }
 594
 595         /* Closing down so delete any entries on the queue */
 596         while (skb_queue_len(&nesvnic->mgt_skb_list)) {
 597                 skb = skb_dequeue(&nesvnic->mgt_skb_list);
 598                 cb = (struct nes_rskb_cb *)&skb->cb[0];
 599                 nes_rem_ref_cm_node(cb->nesqp->cm_node);
 600                 dev_kfree_skb_any(skb);
 601         }
 602         return 0;
 603 }
 604
 605 /**
 606  * nes_queue_skbs - Queue skb so it can be handled in a thread context
 607  */
 608 void nes_queue_mgt_skbs(struct sk_buff *skb, struct nes_vnic *nesvnic, struct nes_qp *nesqp)
 609 {
 610         struct nes_rskb_cb *cb;
 611
 612         cb = (struct nes_rskb_cb *)&skb->cb[0];
 613         cb->nesqp = nesqp;
 614         skb_queue_tail(&nesvnic->mgt_skb_list, skb);
 615         wake_up_interruptible(&nesvnic->mgt_wait_queue);
 616 }
 617
 618 void nes_destroy_pau_qp(struct nes_device *nesdev, struct nes_qp *nesqp)
 619 {
 620         struct sk_buff *skb;
 621         unsigned long flags;
 622         atomic_inc(&pau_qps_destroyed);
 623
 624         /* Free packets that have not yet been forwarded */
 625         /* Lock is acquired by skb_dequeue when removing the skb */
 626         spin_lock_irqsave(&nesqp->pau_lock, flags);
 627         while (skb_queue_len(&nesqp->pau_list)) {
 628                 skb = skb_dequeue(&nesqp->pau_list);
 629                 nes_mgt_free_skb(nesdev, skb, PCI_DMA_TODEVICE);
 630                 nes_rem_ref_cm_node(nesqp->cm_node);
 631         }
 632         spin_unlock_irqrestore(&nesqp->pau_lock, flags);
 633 }
 634
 635 static void nes_chg_qh_handler(struct nes_device *nesdev, struct nes_cqp_request *cqp_request)
 636 {
 637         struct pau_qh_chg *qh_chg = cqp_request->cqp_callback_pointer;
 638         struct nes_cqp_request *new_request;
 639         struct nes_hw_cqp_wqe *cqp_wqe;
 640         struct nes_adapter *nesadapter;
 641         struct nes_qp *nesqp;
 642         struct nes_v4_quad nes_quad;
 643         u32 crc_value;
 644         u64 u64temp;
 645
 646         nesadapter = nesdev->nesadapter;
 647         nesqp = qh_chg->nesqp;
 648
 649         /* Should we handle the bad completion */
 650         if (cqp_request->major_code)
 651                 WARN(1, PFX "Invalid cqp_request major_code=0x%x\n",
 652                        cqp_request->major_code);
 653
 654         switch (nesqp->pau_state) {
 655         case PAU_DEL_QH:
 656                 /* Old hash code deleted, now set the new one */
 657                 nesqp->pau_state = PAU_ADD_LB_QH;
 658                 new_request = nes_get_cqp_request(nesdev);
 659                 if (new_request == NULL) {
 660                         nes_debug(NES_DBG_PAU, "Failed to get a new_request.\n");
 661                         WARN_ON(1);
 662                         return;
 663                 }
 664
 665                 memset(&nes_quad, 0, sizeof(nes_quad));
 666                 nes_quad.DstIpAdrIndex =
 667                         cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
 668                 nes_quad.SrcIpadr = cpu_to_be32(0x7f000001);
 669                 nes_quad.TcpPorts[0] = swab16(nesqp->nesqp_context->tcpPorts[1]);
 670                 nes_quad.TcpPorts[1] = swab16(nesqp->nesqp_context->tcpPorts[0]);
 671
 672                 /* Produce hash key */
 673                 crc_value = get_crc_value(&nes_quad);
 674                 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
 675                 nes_debug(NES_DBG_PAU, "new HTE Index = 0x%08X, CRC = 0x%08X\n",
 676                           nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
 677
 678                 nesqp->hte_index &= nesadapter->hte_index_mask;
 679                 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
 680                 nesqp->nesqp_context->ip0 = cpu_to_le32(0x7f000001);
 681                 nesqp->nesqp_context->rcv_nxt = cpu_to_le32(nesqp->pau_rcv_nxt);
 682
 683                 cqp_wqe = &new_request->cqp_wqe;
 684                 nes_fill_init_cqp_wqe(cqp_wqe, nesdev);
 685                 set_wqe_32bit_value(cqp_wqe->wqe_words,
 686                                     NES_CQP_WQE_OPCODE_IDX, NES_CQP_MANAGE_QUAD_HASH |
 687                                     NES_CQP_QP_TYPE_IWARP | NES_CQP_QP_CONTEXT_VALID | NES_CQP_QP_IWARP_STATE_RTS);
 688                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_CQP_WQE_ID_IDX, nesqp->hwqp.qp_id);
 689                 u64temp = (u64)nesqp->nesqp_context_pbase;
 690                 set_wqe_64bit_value(cqp_wqe->wqe_words, NES_CQP_QP_WQE_CONTEXT_LOW_IDX, u64temp);
 691
 692                 nes_debug(NES_DBG_PAU, "Waiting for CQP completion for adding the quad hash.\n");
 693
 694                 new_request->cqp_callback_pointer = qh_chg;
 695                 new_request->callback = 1;
 696                 new_request->cqp_callback = nes_chg_qh_handler;
 697                 atomic_set(&new_request->refcount, 1);
 698                 nes_post_cqp_request(nesdev, new_request);
 699                 break;
 700
 701         case PAU_ADD_LB_QH:
 702                 /* Start processing the queued fpdu's */
 703                 nesqp->pau_state = PAU_READY;
 704                 process_fpdus(qh_chg->nesvnic, qh_chg->nesqp);
 705                 kfree(qh_chg);
 706                 break;
 707         }
 708 }
 709
 710 /**
 711  * nes_change_quad_hash
 712  */
 713 static int nes_change_quad_hash(struct nes_device *nesdev,
 714                                 struct nes_vnic *nesvnic, struct nes_qp *nesqp)
 715 {
 716         struct nes_cqp_request *cqp_request = NULL;
 717         struct pau_qh_chg *qh_chg = NULL;
 718         u64 u64temp;
 719         struct nes_hw_cqp_wqe *cqp_wqe;
 720         int ret = 0;
 721
 722         cqp_request = nes_get_cqp_request(nesdev);
 723         if (cqp_request == NULL) {
 724                 nes_debug(NES_DBG_PAU, "Failed to get a cqp_request.\n");
 725                 ret = -ENOMEM;
 726                 goto chg_qh_err;
 727         }
 728
 729         qh_chg = kmalloc(sizeof *qh_chg, GFP_ATOMIC);
 730         if (!qh_chg) {
 731                 ret = -ENOMEM;
 732                 goto chg_qh_err;
 733         }
 734         qh_chg->nesdev = nesdev;
 735         qh_chg->nesvnic = nesvnic;
 736         qh_chg->nesqp = nesqp;
 737         nesqp->pau_state = PAU_DEL_QH;
 738
 739         cqp_wqe = &cqp_request->cqp_wqe;
 740         nes_fill_init_cqp_wqe(cqp_wqe, nesdev);
 741         set_wqe_32bit_value(cqp_wqe->wqe_words,
 742                             NES_CQP_WQE_OPCODE_IDX, NES_CQP_MANAGE_QUAD_HASH | NES_CQP_QP_DEL_HTE |
 743                             NES_CQP_QP_TYPE_IWARP | NES_CQP_QP_CONTEXT_VALID | NES_CQP_QP_IWARP_STATE_RTS);
 744         set_wqe_32bit_value(cqp_wqe->wqe_words, NES_CQP_WQE_ID_IDX, nesqp->hwqp.qp_id);
 745         u64temp = (u64)nesqp->nesqp_context_pbase;
 746         set_wqe_64bit_value(cqp_wqe->wqe_words, NES_CQP_QP_WQE_CONTEXT_LOW_IDX, u64temp);
 747
 748         nes_debug(NES_DBG_PAU, "Waiting for CQP completion for deleting the quad hash.\n");
 749
 750         cqp_request->cqp_callback_pointer = qh_chg;
 751         cqp_request->callback = 1;
 752         cqp_request->cqp_callback = nes_chg_qh_handler;
 753         atomic_set(&cqp_request->refcount, 1);
 754         nes_post_cqp_request(nesdev, cqp_request);
 755
 756         return ret;
 757
 758 chg_qh_err:
 759         kfree(qh_chg);
 760         if (cqp_request)
 761                 nes_put_cqp_request(nesdev, cqp_request);
 762         return ret;
 763 }
 764
 765 /**
 766  * nes_mgt_ce_handler
 767  * This management code deals with any packed and unaligned (pau) fpdu's
 768  * that the hardware cannot handle.
 769  */
 770 static void nes_mgt_ce_handler(struct nes_device *nesdev, struct nes_hw_nic_cq *cq)
 771 {
 772         struct nes_vnic_mgt *mgtvnic = container_of(cq, struct nes_vnic_mgt, mgt_cq);
 773         struct nes_adapter *nesadapter = nesdev->nesadapter;
 774         u32 head;
 775         u32 cq_size;
 776         u32 cqe_count = 0;
 777         u32 cqe_misc;
 778         u32 qp_id = 0;
 779         u32 skbs_needed;
 780         unsigned long context;
 781         struct nes_qp *nesqp;
 782         struct sk_buff *rx_skb;
 783         struct nes_rskb_cb *cb;
 784
 785         head = cq->cq_head;
 786         cq_size = cq->cq_size;
 787
 788         while (1) {
 789                 cqe_misc = le32_to_cpu(cq->cq_vbase[head].cqe_words[NES_NIC_CQE_MISC_IDX]);
 790                 if (!(cqe_misc & NES_NIC_CQE_VALID))
 791                         break;
 792
 793                 nesqp = NULL;
 794                 if (cqe_misc & NES_NIC_CQE_ACCQP_VALID) {
 795                         qp_id = le32_to_cpu(cq->cq_vbase[head].cqe_words[NES_NIC_CQE_ACCQP_ID_IDX]);
 796                         qp_id &= 0x001fffff;
 797                         if (qp_id < nesadapter->max_qp) {
 798                                 context = (unsigned long)nesadapter->qp_table[qp_id - NES_FIRST_QPN];
 799                                 nesqp = (struct nes_qp *)context;
 800                         }
 801                 }
 802
 803                 if (nesqp) {
 804                         if (nesqp->pau_mode == false) {
 805                                 nesqp->pau_mode = true; /* First time for this qp */
 806                                 nesqp->pau_rcv_nxt = le32_to_cpu(
 807                                         cq->cq_vbase[head].cqe_words[NES_NIC_CQE_HASH_RCVNXT]);
 808                                 skb_queue_head_init(&nesqp->pau_list);
 809                                 spin_lock_init(&nesqp->pau_lock);
 810                                 atomic_inc(&pau_qps_created);
 811                                 nes_change_quad_hash(nesdev, mgtvnic->nesvnic, nesqp);
 812                         }
 813
 814                         rx_skb = mgtvnic->mgt.rx_skb[mgtvnic->mgt.rq_tail];
 815                         rx_skb->len = 0;
 816                         skb_put(rx_skb, cqe_misc & 0x0000ffff);
 817                         rx_skb->protocol = eth_type_trans(rx_skb, mgtvnic->nesvnic->netdev);
 818                         cb = (struct nes_rskb_cb *)&rx_skb->cb[0];
 819                         pci_unmap_single(nesdev->pcidev, cb->busaddr, cb->maplen, PCI_DMA_FROMDEVICE);
 820                         cb->busaddr = 0;
 821                         mgtvnic->mgt.rq_tail++;
 822                         mgtvnic->mgt.rq_tail &= mgtvnic->mgt.rq_size - 1;
 823
 824                         nes_add_ref_cm_node(nesqp->cm_node);
 825                         nes_queue_mgt_skbs(rx_skb, mgtvnic->nesvnic, nesqp);
 826                 } else {
 827                         printk(KERN_ERR PFX "Invalid QP %d for packed/unaligned handling\n", qp_id);
 828                 }
 829
 830                 cq->cq_vbase[head].cqe_words[NES_NIC_CQE_MISC_IDX] = 0;
 831                 cqe_count++;
 832                 if (++head >= cq_size)
 833                         head = 0;
 834
 835                 if (cqe_count == 255) {
 836                         /* Replenish mgt CQ */
 837                         nes_write32(nesdev->regs + NES_CQE_ALLOC, cq->cq_number | (cqe_count << 16));
 838                         nesdev->currcq_count += cqe_count;
 839                         cqe_count = 0;
 840                 }
 841
 842                 skbs_needed = atomic_inc_return(&mgtvnic->rx_skbs_needed);
 843                 if (skbs_needed > (mgtvnic->mgt.rq_size >> 1))
 844                         nes_replenish_mgt_rq(mgtvnic);
 845         }
 846
 847         cq->cq_head = head;
 848         nes_write32(nesdev->regs + NES_CQE_ALLOC, NES_CQE_ALLOC_NOTIFY_NEXT |
 849                     cq->cq_number | (cqe_count << 16));
 850         nes_read32(nesdev->regs + NES_CQE_ALLOC);
 851         nesdev->currcq_count += cqe_count;
 852 }
 853
 854 /**
 855  * nes_init_mgt_qp
 856  */
 857 int nes_init_mgt_qp(struct nes_device *nesdev, struct net_device *netdev, struct nes_vnic *nesvnic)
 858 {
 859         struct nes_vnic_mgt *mgtvnic;
 860         u32 counter;
 861         void *vmem;
 862         dma_addr_t pmem;
 863         struct nes_hw_cqp_wqe *cqp_wqe;
 864         u32 cqp_head;
 865         unsigned long flags;
 866         struct nes_hw_nic_qp_context *mgt_context;
 867         u64 u64temp;
 868         struct nes_hw_nic_rq_wqe *mgt_rqe;
 869         struct sk_buff *skb;
 870         u32 wqe_count;
 871         struct nes_rskb_cb *cb;
 872         u32 mgt_mem_size;
 873         void *mgt_vbase;
 874         dma_addr_t mgt_pbase;
 875         int i;
 876         int ret;
 877
 878         /* Allocate space the all mgt QPs once */
 879         mgtvnic = kcalloc(NES_MGT_QP_COUNT, sizeof(struct nes_vnic_mgt),
 880                           GFP_KERNEL);
 881         if (!mgtvnic)
 882                 return -ENOMEM;
 883
 884         /* Allocate fragment, RQ, and CQ; Reuse CEQ based on the PCI function */
 885         /* We are not sending from this NIC so sq is not allocated */
 886         mgt_mem_size = 256 +
 887                        (NES_MGT_WQ_COUNT * sizeof(struct nes_hw_nic_rq_wqe)) +
 888                        (NES_MGT_WQ_COUNT * sizeof(struct nes_hw_nic_cqe)) +
 889                        sizeof(struct nes_hw_nic_qp_context);
 890         mgt_mem_size = (mgt_mem_size + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);
 891         mgt_vbase = pci_alloc_consistent(nesdev->pcidev, NES_MGT_QP_COUNT * mgt_mem_size, &mgt_pbase);
 892         if (!mgt_vbase) {
 893                 kfree(mgtvnic);
 894                 nes_debug(NES_DBG_INIT, "Unable to allocate memory for mgt host descriptor rings\n");
 895                 return -ENOMEM;
 896         }
 897
 898         nesvnic->mgt_mem_size = NES_MGT_QP_COUNT * mgt_mem_size;
 899         nesvnic->mgt_vbase = mgt_vbase;
 900         nesvnic->mgt_pbase = mgt_pbase;
 901
 902         skb_queue_head_init(&nesvnic->mgt_skb_list);
 903         init_waitqueue_head(&nesvnic->mgt_wait_queue);
 904         nesvnic->mgt_thread = kthread_run(mgt_thread, nesvnic, "nes_mgt_thread");
 905
 906         for (i = 0; i < NES_MGT_QP_COUNT; i++) {
 907                 mgtvnic->nesvnic = nesvnic;
 908                 mgtvnic->mgt.qp_id = nesdev->mac_index + NES_MGT_QP_OFFSET + i;
 909                 memset(mgt_vbase, 0, mgt_mem_size);
 910                 nes_debug(NES_DBG_INIT, "Allocated mgt QP structures at %p (phys = %016lX), size = %u.\n",
 911                           mgt_vbase, (unsigned long)mgt_pbase, mgt_mem_size);
 912
 913                 vmem = (void *)(((unsigned long)mgt_vbase + (256 - 1)) &
 914                                 ~(unsigned long)(256 - 1));
 915                 pmem = (dma_addr_t)(((unsigned long long)mgt_pbase + (256 - 1)) &
 916                                     ~(unsigned long long)(256 - 1));
 917
 918                 spin_lock_init(&mgtvnic->mgt.rq_lock);
 919
 920                 /* setup the RQ */
 921                 mgtvnic->mgt.rq_vbase = vmem;
 922                 mgtvnic->mgt.rq_pbase = pmem;
 923                 mgtvnic->mgt.rq_head = 0;
 924                 mgtvnic->mgt.rq_tail = 0;
 925                 mgtvnic->mgt.rq_size = NES_MGT_WQ_COUNT;
 926
 927                 /* setup the CQ */
 928                 vmem += (NES_MGT_WQ_COUNT * sizeof(struct nes_hw_nic_rq_wqe));
 929                 pmem += (NES_MGT_WQ_COUNT * sizeof(struct nes_hw_nic_rq_wqe));
 930
 931                 mgtvnic->mgt_cq.cq_number = mgtvnic->mgt.qp_id;
 932                 mgtvnic->mgt_cq.cq_vbase = vmem;
 933                 mgtvnic->mgt_cq.cq_pbase = pmem;
 934                 mgtvnic->mgt_cq.cq_head = 0;
 935                 mgtvnic->mgt_cq.cq_size = NES_MGT_WQ_COUNT;
 936
 937                 mgtvnic->mgt_cq.ce_handler = nes_mgt_ce_handler;
 938
 939                 /* Send CreateCQ request to CQP */
 940                 spin_lock_irqsave(&nesdev->cqp.lock, flags);
 941                 cqp_head = nesdev->cqp.sq_head;
 942
 943                 cqp_wqe = &nesdev->cqp.sq_vbase[cqp_head];
 944                 nes_fill_init_cqp_wqe(cqp_wqe, nesdev);
 945
 946                 cqp_wqe->wqe_words[NES_CQP_WQE_OPCODE_IDX] = cpu_to_le32(
 947                         NES_CQP_CREATE_CQ | NES_CQP_CQ_CEQ_VALID |
 948                         ((u32)mgtvnic->mgt_cq.cq_size << 16));
 949                 cqp_wqe->wqe_words[NES_CQP_WQE_ID_IDX] = cpu_to_le32(
 950                         mgtvnic->mgt_cq.cq_number | ((u32)nesdev->ceq_index << 16));
 951                 u64temp = (u64)mgtvnic->mgt_cq.cq_pbase;
 952                 set_wqe_64bit_value(cqp_wqe->wqe_words, NES_CQP_CQ_WQE_PBL_LOW_IDX, u64temp);
 953                 cqp_wqe->wqe_words[NES_CQP_CQ_WQE_CQ_CONTEXT_HIGH_IDX] = 0;
 954                 u64temp = (unsigned long)&mgtvnic->mgt_cq;
 955                 cqp_wqe->wqe_words[NES_CQP_CQ_WQE_CQ_CONTEXT_LOW_IDX] = cpu_to_le32((u32)(u64temp >> 1));
 956                 cqp_wqe->wqe_words[NES_CQP_CQ_WQE_CQ_CONTEXT_HIGH_IDX] =
 957                         cpu_to_le32(((u32)((u64temp) >> 33)) & 0x7FFFFFFF);
 958                 cqp_wqe->wqe_words[NES_CQP_CQ_WQE_DOORBELL_INDEX_HIGH_IDX] = 0;
 959
 960                 if (++cqp_head >= nesdev->cqp.sq_size)
 961                         cqp_head = 0;
 962                 cqp_wqe = &nesdev->cqp.sq_vbase[cqp_head];
 963                 nes_fill_init_cqp_wqe(cqp_wqe, nesdev);
 964
 965                 /* Send CreateQP request to CQP */
 966                 mgt_context = (void *)(&mgtvnic->mgt_cq.cq_vbase[mgtvnic->mgt_cq.cq_size]);
 967                 mgt_context->context_words[NES_NIC_CTX_MISC_IDX] =
 968                         cpu_to_le32((u32)NES_MGT_CTX_SIZE |
 969                                     ((u32)PCI_FUNC(nesdev->pcidev->devfn) << 12));
 970                 nes_debug(NES_DBG_INIT, "RX_WINDOW_BUFFER_PAGE_TABLE_SIZE = 0x%08X, RX_WINDOW_BUFFER_SIZE = 0x%08X\n",
 971                           nes_read_indexed(nesdev, NES_IDX_RX_WINDOW_BUFFER_PAGE_TABLE_SIZE),
 972                           nes_read_indexed(nesdev, NES_IDX_RX_WINDOW_BUFFER_SIZE));
 973                 if (nes_read_indexed(nesdev, NES_IDX_RX_WINDOW_BUFFER_SIZE) != 0)
 974                         mgt_context->context_words[NES_NIC_CTX_MISC_IDX] |= cpu_to_le32(NES_NIC_BACK_STORE);
 975
 976                 u64temp = (u64)mgtvnic->mgt.rq_pbase;
 977                 mgt_context->context_words[NES_NIC_CTX_SQ_LOW_IDX] = cpu_to_le32((u32)u64temp);
 978                 mgt_context->context_words[NES_NIC_CTX_SQ_HIGH_IDX] = cpu_to_le32((u32)(u64temp >> 32));
 979                 u64temp = (u64)mgtvnic->mgt.rq_pbase;
 980                 mgt_context->context_words[NES_NIC_CTX_RQ_LOW_IDX] = cpu_to_le32((u32)u64temp);
 981                 mgt_context->context_words[NES_NIC_CTX_RQ_HIGH_IDX] = cpu_to_le32((u32)(u64temp >> 32));
 982
 983                 cqp_wqe->wqe_words[NES_CQP_WQE_OPCODE_IDX] = cpu_to_le32(NES_CQP_CREATE_QP |
 984                                                                          NES_CQP_QP_TYPE_NIC);
 985                 cqp_wqe->wqe_words[NES_CQP_WQE_ID_IDX] = cpu_to_le32(mgtvnic->mgt.qp_id);
 986                 u64temp = (u64)mgtvnic->mgt_cq.cq_pbase +
 987                           (mgtvnic->mgt_cq.cq_size * sizeof(struct nes_hw_nic_cqe));
 988                 set_wqe_64bit_value(cqp_wqe->wqe_words, NES_CQP_QP_WQE_CONTEXT_LOW_IDX, u64temp);
 989
 990                 if (++cqp_head >= nesdev->cqp.sq_size)
 991                         cqp_head = 0;
 992                 nesdev->cqp.sq_head = cqp_head;
 993
 994                 barrier();
 995
 996                 /* Ring doorbell (2 WQEs) */
 997                 nes_write32(nesdev->regs + NES_WQE_ALLOC, 0x02800000 | nesdev->cqp.qp_id);
 998
 999                 spin_unlock_irqrestore(&nesdev->cqp.lock, flags);
1000                 nes_debug(NES_DBG_INIT, "Waiting for create MGT QP%u to complete.\n",
1001                           mgtvnic->mgt.qp_id);
1002
1003                 ret = wait_event_timeout(nesdev->cqp.waitq, (nesdev->cqp.sq_tail == cqp_head),
1004                                          NES_EVENT_TIMEOUT);
1005                 nes_debug(NES_DBG_INIT, "Create MGT QP%u completed, wait_event_timeout ret = %u.\n",
1006                           mgtvnic->mgt.qp_id, ret);
1007                 if (!ret) {
1008                         nes_debug(NES_DBG_INIT, "MGT QP%u create timeout expired\n", mgtvnic->mgt.qp_id);
1009                         if (i == 0) {
1010                                 pci_free_consistent(nesdev->pcidev, nesvnic->mgt_mem_size, nesvnic->mgt_vbase,
1011                                                     nesvnic->mgt_pbase);
1012                                 kfree(mgtvnic);
1013                         } else {
1014                                 nes_destroy_mgt(nesvnic);
1015                         }
1016                         return -EIO;
1017                 }
1018
1019                 /* Populate the RQ */
1020                 for (counter = 0; counter < (NES_MGT_WQ_COUNT - 1); counter++) {
1021                         skb = dev_alloc_skb(nesvnic->max_frame_size);
1022                         if (!skb) {
1023                                 nes_debug(NES_DBG_INIT, "%s: out of memory for receive skb\n", netdev->name);
1024                                 return -ENOMEM;
1025                         }
1026
1027                         skb->dev = netdev;
1028
1029                         pmem = pci_map_single(nesdev->pcidev, skb->data,
1030                                               nesvnic->max_frame_size, PCI_DMA_FROMDEVICE);
1031                         cb = (struct nes_rskb_cb *)&skb->cb[0];
1032                         cb->busaddr = pmem;
1033                         cb->maplen = nesvnic->max_frame_size;
1034
1035                         mgt_rqe = &mgtvnic->mgt.rq_vbase[counter];
1036                         mgt_rqe->wqe_words[NES_NIC_RQ_WQE_LENGTH_1_0_IDX] = cpu_to_le32((u32)nesvnic->max_frame_size);
1037                         mgt_rqe->wqe_words[NES_NIC_RQ_WQE_LENGTH_3_2_IDX] = 0;
1038                         mgt_rqe->wqe_words[NES_NIC_RQ_WQE_FRAG0_LOW_IDX] = cpu_to_le32((u32)pmem);
1039                         mgt_rqe->wqe_words[NES_NIC_RQ_WQE_FRAG0_HIGH_IDX] = cpu_to_le32((u32)((u64)pmem >> 32));
1040                         mgtvnic->mgt.rx_skb[counter] = skb;
1041                 }
1042
1043                 timer_setup(&mgtvnic->rq_wqes_timer, nes_mgt_rq_wqes_timeout,
1044                             0);
1045
1046                 wqe_count = NES_MGT_WQ_COUNT - 1;
1047                 mgtvnic->mgt.rq_head = wqe_count;
1048                 barrier();
1049                 do {
1050                         counter = min(wqe_count, ((u32)255));
1051                         wqe_count -= counter;
1052                         nes_write32(nesdev->regs + NES_WQE_ALLOC, (counter << 24) | mgtvnic->mgt.qp_id);
1053                 } while (wqe_count);
1054
1055                 nes_write32(nesdev->regs + NES_CQE_ALLOC, NES_CQE_ALLOC_NOTIFY_NEXT |
1056                             mgtvnic->mgt_cq.cq_number);
1057                 nes_read32(nesdev->regs + NES_CQE_ALLOC);
1058
1059                 mgt_vbase += mgt_mem_size;
1060                 mgt_pbase += mgt_mem_size;
1061                 nesvnic->mgtvnic[i] = mgtvnic++;
1062         }
1063         return 0;
1064 }
1065
1066
1067 void nes_destroy_mgt(struct nes_vnic *nesvnic)
1068 {
1069         struct nes_device *nesdev = nesvnic->nesdev;
1070         struct nes_vnic_mgt *mgtvnic;
1071         struct nes_vnic_mgt *first_mgtvnic;
1072         unsigned long flags;
1073         struct nes_hw_cqp_wqe *cqp_wqe;
1074         u32 cqp_head;
1075         struct sk_buff *rx_skb;
1076         int i;
1077         int ret;
1078
1079         kthread_stop(nesvnic->mgt_thread);
1080
1081         /* Free remaining NIC receive buffers */
1082         first_mgtvnic = nesvnic->mgtvnic[0];
1083         for (i = 0; i < NES_MGT_QP_COUNT; i++) {
1084                 mgtvnic = nesvnic->mgtvnic[i];
1085                 if (mgtvnic == NULL)
1086                         continue;
1087
1088                 while (mgtvnic->mgt.rq_head != mgtvnic->mgt.rq_tail) {
1089                         rx_skb = mgtvnic->mgt.rx_skb[mgtvnic->mgt.rq_tail];
1090                         nes_mgt_free_skb(nesdev, rx_skb, PCI_DMA_FROMDEVICE);
1091                         mgtvnic->mgt.rq_tail++;
1092                         mgtvnic->mgt.rq_tail &= (mgtvnic->mgt.rq_size - 1);
1093                 }
1094
1095                 spin_lock_irqsave(&nesdev->cqp.lock, flags);
1096
1097                 /* Destroy NIC QP */
1098                 cqp_head = nesdev->cqp.sq_head;
1099                 cqp_wqe = &nesdev->cqp.sq_vbase[cqp_head];
1100                 nes_fill_init_cqp_wqe(cqp_wqe, nesdev);
1101
1102                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_CQP_WQE_OPCODE_IDX,
1103                                     (NES_CQP_DESTROY_QP | NES_CQP_QP_TYPE_NIC));
1104                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_CQP_WQE_ID_IDX,
1105                                     mgtvnic->mgt.qp_id);
1106
1107                 if (++cqp_head >= nesdev->cqp.sq_size)
1108                         cqp_head = 0;
1109
1110                 cqp_wqe = &nesdev->cqp.sq_vbase[cqp_head];
1111
1112                 /* Destroy NIC CQ */
1113                 nes_fill_init_cqp_wqe(cqp_wqe, nesdev);
1114                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_CQP_WQE_OPCODE_IDX,
1115                                     (NES_CQP_DESTROY_CQ | ((u32)mgtvnic->mgt_cq.cq_size << 16)));
1116                 set_wqe_32bit_value(cqp_wqe->wqe_words, NES_CQP_WQE_ID_IDX,
1117                                     (mgtvnic->mgt_cq.cq_number | ((u32)nesdev->ceq_index << 16)));
1118
1119                 if (++cqp_head >= nesdev->cqp.sq_size)
1120                         cqp_head = 0;
1121
1122                 nesdev->cqp.sq_head = cqp_head;
1123                 barrier();
1124
1125                 /* Ring doorbell (2 WQEs) */
1126                 nes_write32(nesdev->regs + NES_WQE_ALLOC, 0x02800000 | nesdev->cqp.qp_id);
1127
1128                 spin_unlock_irqrestore(&nesdev->cqp.lock, flags);
1129                 nes_debug(NES_DBG_SHUTDOWN, "Waiting for CQP, cqp_head=%u, cqp.sq_head=%u,"
1130                           " cqp.sq_tail=%u, cqp.sq_size=%u\n",
1131                           cqp_head, nesdev->cqp.sq_head,
1132                           nesdev->cqp.sq_tail, nesdev->cqp.sq_size);
1133
1134                 ret = wait_event_timeout(nesdev->cqp.waitq, (nesdev->cqp.sq_tail == cqp_head),
1135                                          NES_EVENT_TIMEOUT);
1136
1137                 nes_debug(NES_DBG_SHUTDOWN, "Destroy MGT QP returned, wait_event_timeout ret = %u, cqp_head=%u,"
1138                           " cqp.sq_head=%u, cqp.sq_tail=%u\n",
1139                           ret, cqp_head, nesdev->cqp.sq_head, nesdev->cqp.sq_tail);
1140                 if (!ret)
1141                         nes_debug(NES_DBG_SHUTDOWN, "MGT QP%u destroy timeout expired\n",
1142                                   mgtvnic->mgt.qp_id);
1143
1144                 nesvnic->mgtvnic[i] = NULL;
1145         }
1146
1147         if (nesvnic->mgt_vbase) {
1148                 pci_free_consistent(nesdev->pcidev, nesvnic->mgt_mem_size, nesvnic->mgt_vbase,
1149                                     nesvnic->mgt_pbase);
1150                 nesvnic->mgt_vbase = NULL;
1151                 nesvnic->mgt_pbase = 0;
1152         }
1153
1154         kfree(first_mgtvnic);
1155 }