drivers/s390/net/qeth_eddp.c

   1 /*
   2  *
   3  * linux/drivers/s390/net/qeth_eddp.c ($Revision: 1.11 $)
   4  *
   5  * Enhanced Device Driver Packing (EDDP) support for the qeth driver.
   6  *
   7  * Copyright 2004 IBM Corporation
   8  *
   9  *    Author(s): Thomas Spatzier <tspat@de.ibm.com>
  10  *
  11  *    $Revision: 1.11 $  $Date: 2005/03/24 09:04:18 $
  12  *
  13  */
  14 #include <linux/config.h>
  15 #include <linux/errno.h>
  16 #include <linux/ip.h>
  17 #include <linux/inetdevice.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/kernel.h>
  20 #include <linux/tcp.h>
  21 #include <net/tcp.h>
  22 #include <linux/skbuff.h>
  23
  24 #include <net/ip.h>
  25
  26 #include "qeth.h"
  27 #include "qeth_mpc.h"
  28 #include "qeth_eddp.h"
  29
  30 int
  31 qeth_eddp_check_buffers_for_context(struct qeth_qdio_out_q *queue,
  32                                     struct qeth_eddp_context *ctx)
  33 {
  34         int index = queue->next_buf_to_fill;
  35         int elements_needed = ctx->num_elements;
  36         int elements_in_buffer;
  37         int skbs_in_buffer;
  38         int buffers_needed = 0;
  39
  40         QETH_DBF_TEXT(trace, 5, "eddpcbfc");
  41         while(elements_needed > 0) {
  42                 buffers_needed++;
  43                 if (atomic_read(&queue->bufs[index].state) !=
  44                                 QETH_QDIO_BUF_EMPTY)
  45                         return -EBUSY;
  46
  47                 elements_in_buffer = QETH_MAX_BUFFER_ELEMENTS(queue->card) -
  48                                      queue->bufs[index].next_element_to_fill;
  49                 skbs_in_buffer = elements_in_buffer / ctx->elements_per_skb;
  50                 elements_needed -= skbs_in_buffer * ctx->elements_per_skb;
  51                 index = (index + 1) % QDIO_MAX_BUFFERS_PER_Q;
  52         }
  53         return buffers_needed;
  54 }
  55
  56 static inline void
  57 qeth_eddp_free_context(struct qeth_eddp_context *ctx)
  58 {
  59         int i;
  60
  61         QETH_DBF_TEXT(trace, 5, "eddpfctx");
  62         for (i = 0; i < ctx->num_pages; ++i)
  63                 free_page((unsigned long)ctx->pages[i]);
  64         kfree(ctx->pages);
  65         if (ctx->elements != NULL)
  66                 kfree(ctx->elements);
  67         kfree(ctx);
  68 }
  69
  70
  71 static inline void
  72 qeth_eddp_get_context(struct qeth_eddp_context *ctx)
  73 {
  74         atomic_inc(&ctx->refcnt);
  75 }
  76
  77 void
  78 qeth_eddp_put_context(struct qeth_eddp_context *ctx)
  79 {
  80         if (atomic_dec_return(&ctx->refcnt) == 0)
  81                 qeth_eddp_free_context(ctx);
  82 }
  83
  84 void
  85 qeth_eddp_buf_release_contexts(struct qeth_qdio_out_buffer *buf)
  86 {
  87         struct qeth_eddp_context_reference *ref;
  88
  89         QETH_DBF_TEXT(trace, 6, "eddprctx");
  90         while (!list_empty(&buf->ctx_list)){
  91                 ref = list_entry(buf->ctx_list.next,
  92                                  struct qeth_eddp_context_reference, list);
  93                 qeth_eddp_put_context(ref->ctx);
  94                 list_del(&ref->list);
  95                 kfree(ref);
  96         }
  97 }
  98
  99 static inline int
 100 qeth_eddp_buf_ref_context(struct qeth_qdio_out_buffer *buf,
 101                           struct qeth_eddp_context *ctx)
 102 {
 103         struct qeth_eddp_context_reference *ref;
 104
 105         QETH_DBF_TEXT(trace, 6, "eddprfcx");
 106         ref = kmalloc(sizeof(struct qeth_eddp_context_reference), GFP_ATOMIC);
 107         if (ref == NULL)
 108                 return -ENOMEM;
 109         qeth_eddp_get_context(ctx);
 110         ref->ctx = ctx;
 111         list_add_tail(&ref->list, &buf->ctx_list);
 112         return 0;
 113 }
 114
 115 int
 116 qeth_eddp_fill_buffer(struct qeth_qdio_out_q *queue,
 117                       struct qeth_eddp_context *ctx,
 118                       int index)
 119 {
 120         struct qeth_qdio_out_buffer *buf = NULL;
 121         struct qdio_buffer *buffer;
 122         int elements = ctx->num_elements;
 123         int element = 0;
 124         int flush_cnt = 0;
 125         int must_refcnt = 1;
 126         int i;
 127
 128         QETH_DBF_TEXT(trace, 5, "eddpfibu");
 129         while (elements > 0) {
 130                 buf = &queue->bufs[index];
 131                 if (atomic_read(&buf->state) != QETH_QDIO_BUF_EMPTY){
 132                         /* normally this should not happen since we checked for
 133                          * available elements in qeth_check_elements_for_context
 134                          */
 135                         if (element == 0)
 136                                 return -EBUSY;
 137                         else {
 138                                 PRINT_WARN("could only partially fill eddp "
 139                                            "buffer!\n");
 140                                 goto out;
 141                         }
 142                 }
 143                 /* check if the whole next skb fits into current buffer */
 144                 if ((QETH_MAX_BUFFER_ELEMENTS(queue->card) -
 145                                         buf->next_element_to_fill)
 146                                 < ctx->elements_per_skb){
 147                         /* no -> go to next buffer */
 148                         atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
 149                         index = (index + 1) % QDIO_MAX_BUFFERS_PER_Q;
 150                         flush_cnt++;
 151                         /* new buffer, so we have to add ctx to buffer'ctx_list
 152                          * and increment ctx's refcnt */
 153                         must_refcnt = 1;
 154                         continue;
 155                 }
 156                 if (must_refcnt){
 157                         must_refcnt = 0;
 158                         if (qeth_eddp_buf_ref_context(buf, ctx)){
 159                                 PRINT_WARN("no memory to create eddp context "
 160                                            "reference\n");
 161                                 goto out_check;
 162                         }
 163                 }
 164                 buffer = buf->buffer;
 165                 /* fill one skb into buffer */
 166                 for (i = 0; i < ctx->elements_per_skb; ++i){
 167                         buffer->element[buf->next_element_to_fill].addr =
 168                                 ctx->elements[element].addr;
 169                         buffer->element[buf->next_element_to_fill].length =
 170                                 ctx->elements[element].length;
 171                         buffer->element[buf->next_element_to_fill].flags =
 172                                 ctx->elements[element].flags;
 173                         buf->next_element_to_fill++;
 174                         element++;
 175                         elements--;
 176                 }
 177         }
 178 out_check:
 179         if (!queue->do_pack) {
 180                 QETH_DBF_TEXT(trace, 6, "fillbfnp");
 181                 /* set state to PRIMED -> will be flushed */
 182                 if (buf->next_element_to_fill > 0){
 183                         atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
 184                         flush_cnt++;
 185                 }
 186         } else {
 187 #ifdef CONFIG_QETH_PERF_STATS
 188                 queue->card->perf_stats.skbs_sent_pack++;
 189 #endif
 190                 QETH_DBF_TEXT(trace, 6, "fillbfpa");
 191                 if (buf->next_element_to_fill >=
 192                                 QETH_MAX_BUFFER_ELEMENTS(queue->card)) {
 193                         /*
 194                          * packed buffer if full -> set state PRIMED
 195                          * -> will be flushed
 196                          */
 197                         atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
 198                         flush_cnt++;
 199                 }
 200         }
 201 out:
 202         return flush_cnt;
 203 }
 204
 205 static inline int
 206 qeth_get_skb_data_len(struct sk_buff *skb)
 207 {
 208         int len = skb->len;
 209         int i;
 210
 211         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i)
 212                 len -= skb_shinfo(skb)->frags[i].size;
 213         return len;
 214 }
 215
 216 static inline void
 217 qeth_eddp_create_segment_hdrs(struct qeth_eddp_context *ctx,
 218                               struct qeth_eddp_data *eddp)
 219 {
 220         u8 *page;
 221         int page_remainder;
 222         int page_offset;
 223         int hdr_len;
 224         struct qeth_eddp_element *element;
 225
 226         QETH_DBF_TEXT(trace, 5, "eddpcrsh");
 227         page = ctx->pages[ctx->offset >> PAGE_SHIFT];
 228         page_offset = ctx->offset % PAGE_SIZE;
 229         element = &ctx->elements[ctx->num_elements];
 230         hdr_len = eddp->nhl + eddp->thl;
 231         /* FIXME: layer2 and VLAN !!! */
 232         if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2)
 233                 hdr_len += ETH_HLEN;
 234         if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q))
 235                 hdr_len += VLAN_HLEN;
 236         /* does complete header fit in current page ? */
 237         page_remainder = PAGE_SIZE - page_offset;
 238         if (page_remainder < (sizeof(struct qeth_hdr) + hdr_len)){
 239                 /* no -> go to start of next page */
 240                 ctx->offset += page_remainder;
 241                 page = ctx->pages[ctx->offset >> PAGE_SHIFT];
 242                 page_offset = 0;
 243         }
 244         memcpy(page + page_offset, &eddp->qh, sizeof(struct qeth_hdr));
 245         element->addr = page + page_offset;
 246         element->length = sizeof(struct qeth_hdr);
 247         ctx->offset += sizeof(struct qeth_hdr);
 248         page_offset += sizeof(struct qeth_hdr);
 249         /* add mac header (?) */
 250         if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2){
 251                 memcpy(page + page_offset, &eddp->mac, ETH_HLEN);
 252                 element->length += ETH_HLEN;
 253                 ctx->offset += ETH_HLEN;
 254                 page_offset += ETH_HLEN;
 255         }
 256         /* add VLAN tag */
 257         if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)){
 258                 memcpy(page + page_offset, &eddp->vlan, VLAN_HLEN);
 259                 element->length += VLAN_HLEN;
 260                 ctx->offset += VLAN_HLEN;
 261                 page_offset += VLAN_HLEN;
 262         }
 263         /* add network header */
 264         memcpy(page + page_offset, (u8 *)&eddp->nh, eddp->nhl);
 265         element->length += eddp->nhl;
 266         eddp->nh_in_ctx = page + page_offset;
 267         ctx->offset += eddp->nhl;
 268         page_offset += eddp->nhl;
 269         /* add transport header */
 270         memcpy(page + page_offset, (u8 *)&eddp->th, eddp->thl);
 271         element->length += eddp->thl;
 272         eddp->th_in_ctx = page + page_offset;
 273         ctx->offset += eddp->thl;
 274 }
 275
 276 static inline void
 277 qeth_eddp_copy_data_tcp(char *dst, struct qeth_eddp_data *eddp, int len,
 278                         u32 *hcsum)
 279 {
 280         struct skb_frag_struct *frag;
 281         int left_in_frag;
 282         int copy_len;
 283         u8 *src;
 284
 285         QETH_DBF_TEXT(trace, 5, "eddpcdtc");
 286         if (skb_shinfo(eddp->skb)->nr_frags == 0) {
 287                 memcpy(dst, eddp->skb->data + eddp->skb_offset, len);
 288                 *hcsum = csum_partial(eddp->skb->data + eddp->skb_offset, len,
 289                                       *hcsum);
 290                 eddp->skb_offset += len;
 291         } else {
 292                 while (len > 0) {
 293                         if (eddp->frag < 0) {
 294                                 /* we're in skb->data */
 295                                 left_in_frag = qeth_get_skb_data_len(eddp->skb)
 296                                                 - eddp->skb_offset;
 297                                 src = eddp->skb->data + eddp->skb_offset;
 298                         } else {
 299                                 frag = &skb_shinfo(eddp->skb)->
 300                                         frags[eddp->frag];
 301                                 left_in_frag = frag->size - eddp->frag_offset;
 302                                 src = (u8 *)(
 303                                         (page_to_pfn(frag->page) << PAGE_SHIFT)+
 304                                         frag->page_offset + eddp->frag_offset);
 305                         }
 306                         if (left_in_frag <= 0) {
 307                                 eddp->frag++;
 308                                 eddp->frag_offset = 0;
 309                                 continue;
 310                         }
 311                         copy_len = min(left_in_frag, len);
 312                         memcpy(dst, src, copy_len);
 313                         *hcsum = csum_partial(src, copy_len, *hcsum);
 314                         dst += copy_len;
 315                         eddp->frag_offset += copy_len;
 316                         eddp->skb_offset += copy_len;
 317                         len -= copy_len;
 318                 }
 319         }
 320 }
 321
 322 static inline void
 323 qeth_eddp_create_segment_data_tcp(struct qeth_eddp_context *ctx,
 324                                   struct qeth_eddp_data *eddp, int data_len,
 325                                   u32 hcsum)
 326 {
 327         u8 *page;
 328         int page_remainder;
 329         int page_offset;
 330         struct qeth_eddp_element *element;
 331         int first_lap = 1;
 332
 333         QETH_DBF_TEXT(trace, 5, "eddpcsdt");
 334         page = ctx->pages[ctx->offset >> PAGE_SHIFT];
 335         page_offset = ctx->offset % PAGE_SIZE;
 336         element = &ctx->elements[ctx->num_elements];
 337         while (data_len){
 338                 page_remainder = PAGE_SIZE - page_offset;
 339                 if (page_remainder < data_len){
 340                         qeth_eddp_copy_data_tcp(page + page_offset, eddp,
 341                                                 page_remainder, &hcsum);
 342                         element->length += page_remainder;
 343                         if (first_lap)
 344                                 element->flags = SBAL_FLAGS_FIRST_FRAG;
 345                         else
 346                                 element->flags = SBAL_FLAGS_MIDDLE_FRAG;
 347                         ctx->num_elements++;
 348                         element++;
 349                         data_len -= page_remainder;
 350                         ctx->offset += page_remainder;
 351                         page = ctx->pages[ctx->offset >> PAGE_SHIFT];
 352                         page_offset = 0;
 353                         element->addr = page + page_offset;
 354                 } else {
 355                         qeth_eddp_copy_data_tcp(page + page_offset, eddp,
 356                                                 data_len, &hcsum);
 357                         element->length += data_len;
 358                         if (!first_lap)
 359                                 element->flags = SBAL_FLAGS_LAST_FRAG;
 360                         ctx->num_elements++;
 361                         ctx->offset += data_len;
 362                         data_len = 0;
 363                 }
 364                 first_lap = 0;
 365         }
 366         ((struct tcphdr *)eddp->th_in_ctx)->check = csum_fold(hcsum);
 367 }
 368
 369 static inline u32
 370 qeth_eddp_check_tcp4_hdr(struct qeth_eddp_data *eddp, int data_len)
 371 {
 372         u32 phcsum; /* pseudo header checksum */
 373
 374         QETH_DBF_TEXT(trace, 5, "eddpckt4");
 375         eddp->th.tcp.h.check = 0;
 376         /* compute pseudo header checksum */
 377         phcsum = csum_tcpudp_nofold(eddp->nh.ip4.h.saddr, eddp->nh.ip4.h.daddr,
 378                                     eddp->thl + data_len, IPPROTO_TCP, 0);
 379         /* compute checksum of tcp header */
 380         return csum_partial((u8 *)&eddp->th, eddp->thl, phcsum);
 381 }
 382
 383 static inline u32
 384 qeth_eddp_check_tcp6_hdr(struct qeth_eddp_data *eddp, int data_len)
 385 {
 386         u32 proto;
 387         u32 phcsum; /* pseudo header checksum */
 388
 389         QETH_DBF_TEXT(trace, 5, "eddpckt6");
 390         eddp->th.tcp.h.check = 0;
 391         /* compute pseudo header checksum */
 392         phcsum = csum_partial((u8 *)&eddp->nh.ip6.h.saddr,
 393                               sizeof(struct in6_addr), 0);
 394         phcsum = csum_partial((u8 *)&eddp->nh.ip6.h.daddr,
 395                               sizeof(struct in6_addr), phcsum);
 396         proto = htonl(IPPROTO_TCP);
 397         phcsum = csum_partial((u8 *)&proto, sizeof(u32), phcsum);
 398         return phcsum;
 399 }
 400
 401 static inline struct qeth_eddp_data *
 402 qeth_eddp_create_eddp_data(struct qeth_hdr *qh, u8 *nh, u8 nhl, u8 *th, u8 thl)
 403 {
 404         struct qeth_eddp_data *eddp;
 405
 406         QETH_DBF_TEXT(trace, 5, "eddpcrda");
 407         eddp = kmalloc(sizeof(struct qeth_eddp_data), GFP_ATOMIC);
 408         if (eddp){
 409                 memset(eddp, 0, sizeof(struct qeth_eddp_data));
 410                 eddp->nhl = nhl;
 411                 eddp->thl = thl;
 412                 memcpy(&eddp->qh, qh, sizeof(struct qeth_hdr));
 413                 memcpy(&eddp->nh, nh, nhl);
 414                 memcpy(&eddp->th, th, thl);
 415                 eddp->frag = -1; /* initially we're in skb->data */
 416         }
 417         return eddp;
 418 }
 419
 420 static inline void
 421 __qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx,
 422                              struct qeth_eddp_data *eddp)
 423 {
 424         struct tcphdr *tcph;
 425         int data_len;
 426         u32 hcsum;
 427
 428         QETH_DBF_TEXT(trace, 5, "eddpftcp");
 429         eddp->skb_offset = sizeof(struct qeth_hdr) + eddp->nhl + eddp->thl;
 430         tcph = eddp->skb->h.th;
 431         while (eddp->skb_offset < eddp->skb->len) {
 432                 data_len = min((int)skb_shinfo(eddp->skb)->tso_size,
 433                                (int)(eddp->skb->len - eddp->skb_offset));
 434                 /* prepare qdio hdr */
 435                 if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2){
 436                         eddp->qh.hdr.l2.pkt_length = data_len + ETH_HLEN +
 437                                                      eddp->nhl + eddp->thl -
 438                                                      sizeof(struct qeth_hdr);
 439 #ifdef CONFIG_QETH_VLAN
 440                         if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q))
 441                                 eddp->qh.hdr.l2.pkt_length += VLAN_HLEN;
 442 #endif /* CONFIG_QETH_VLAN */
 443                 } else
 444                         eddp->qh.hdr.l3.length = data_len + eddp->nhl +
 445                                                  eddp->thl;
 446                 /* prepare ip hdr */
 447                 if (eddp->skb->protocol == ETH_P_IP){
 448                         eddp->nh.ip4.h.tot_len = data_len + eddp->nhl +
 449                                                  eddp->thl;
 450                         eddp->nh.ip4.h.check = 0;
 451                         eddp->nh.ip4.h.check =
 452                                 ip_fast_csum((u8 *)&eddp->nh.ip4.h,
 453                                                 eddp->nh.ip4.h.ihl);
 454                 } else
 455                         eddp->nh.ip6.h.payload_len = data_len + eddp->thl;
 456                 /* prepare tcp hdr */
 457                 if (data_len == (eddp->skb->len - eddp->skb_offset)){
 458                         /* last segment -> set FIN and PSH flags */
 459                         eddp->th.tcp.h.fin = tcph->fin;
 460                         eddp->th.tcp.h.psh = tcph->psh;
 461                 }
 462                 if (eddp->skb->protocol == ETH_P_IP)
 463                         hcsum = qeth_eddp_check_tcp4_hdr(eddp, data_len);
 464                 else
 465                         hcsum = qeth_eddp_check_tcp6_hdr(eddp, data_len);
 466                 /* fill the next segment into the context */
 467                 qeth_eddp_create_segment_hdrs(ctx, eddp);
 468                 qeth_eddp_create_segment_data_tcp(ctx, eddp, data_len, hcsum);
 469                 if (eddp->skb_offset >= eddp->skb->len)
 470                         break;
 471                 /* prepare headers for next round */
 472                 if (eddp->skb->protocol == ETH_P_IP)
 473                         eddp->nh.ip4.h.id++;
 474                 eddp->th.tcp.h.seq += data_len;
 475         }
 476 }
 477
 478 static inline int
 479 qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx,
 480                            struct sk_buff *skb, struct qeth_hdr *qhdr)
 481 {
 482         struct qeth_eddp_data *eddp = NULL;
 483
 484         QETH_DBF_TEXT(trace, 5, "eddpficx");
 485         /* create our segmentation headers and copy original headers */
 486         if (skb->protocol == ETH_P_IP)
 487                 eddp = qeth_eddp_create_eddp_data(qhdr, (u8 *)skb->nh.iph,
 488                                 skb->nh.iph->ihl*4,
 489                                 (u8 *)skb->h.th, skb->h.th->doff*4);
 490         else
 491                 eddp = qeth_eddp_create_eddp_data(qhdr, (u8 *)skb->nh.ipv6h,
 492                                 sizeof(struct ipv6hdr),
 493                                 (u8 *)skb->h.th, skb->h.th->doff*4);
 494
 495         if (eddp == NULL) {
 496                 QETH_DBF_TEXT(trace, 2, "eddpfcnm");
 497                 return -ENOMEM;
 498         }
 499         if (qhdr->hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
 500                 memcpy(&eddp->mac, eth_hdr(skb), ETH_HLEN);
 501 #ifdef CONFIG_QETH_VLAN
 502                 if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) {
 503                         eddp->vlan[0] = __constant_htons(skb->protocol);
 504                         eddp->vlan[1] = htons(vlan_tx_tag_get(skb));
 505                 }
 506 #endif /* CONFIG_QETH_VLAN */
 507         }
 508         /* the next flags will only be set on the last segment */
 509         eddp->th.tcp.h.fin = 0;
 510         eddp->th.tcp.h.psh = 0;
 511         eddp->skb = skb;
 512         /* begin segmentation and fill context */
 513         __qeth_eddp_fill_context_tcp(ctx, eddp);
 514         kfree(eddp);
 515         return 0;
 516 }
 517
 518 static inline void
 519 qeth_eddp_calc_num_pages(struct qeth_eddp_context *ctx, struct sk_buff *skb,
 520                          int hdr_len)
 521 {
 522         int skbs_per_page;
 523
 524         QETH_DBF_TEXT(trace, 5, "eddpcanp");
 525         /* can we put multiple skbs in one page? */
 526         skbs_per_page = PAGE_SIZE / (skb_shinfo(skb)->tso_size + hdr_len);
 527         if (skbs_per_page > 1){
 528                 ctx->num_pages = (skb_shinfo(skb)->tso_segs + 1) /
 529                                  skbs_per_page + 1;
 530                 ctx->elements_per_skb = 1;
 531         } else {
 532                 /* no -> how many elements per skb? */
 533                 ctx->elements_per_skb = (skb_shinfo(skb)->tso_size + hdr_len +
 534                                      PAGE_SIZE) >> PAGE_SHIFT;
 535                 ctx->num_pages = ctx->elements_per_skb *
 536                                  (skb_shinfo(skb)->tso_segs + 1);
 537         }
 538         ctx->num_elements = ctx->elements_per_skb *
 539                             (skb_shinfo(skb)->tso_segs + 1);
 540 }
 541
 542 static inline struct qeth_eddp_context *
 543 qeth_eddp_create_context_generic(struct qeth_card *card, struct sk_buff *skb,
 544                                  int hdr_len)
 545 {
 546         struct qeth_eddp_context *ctx = NULL;
 547         u8 *addr;
 548         int i;
 549
 550         QETH_DBF_TEXT(trace, 5, "creddpcg");
 551         /* create the context and allocate pages */
 552         ctx = kmalloc(sizeof(struct qeth_eddp_context), GFP_ATOMIC);
 553         if (ctx == NULL){
 554                 QETH_DBF_TEXT(trace, 2, "ceddpcn1");
 555                 return NULL;
 556         }
 557         memset(ctx, 0, sizeof(struct qeth_eddp_context));
 558         ctx->type = QETH_LARGE_SEND_EDDP;
 559         qeth_eddp_calc_num_pages(ctx, skb, hdr_len);
 560         if (ctx->elements_per_skb > QETH_MAX_BUFFER_ELEMENTS(card)){
 561                 QETH_DBF_TEXT(trace, 2, "ceddpcis");
 562                 kfree(ctx);
 563                 return NULL;
 564         }
 565         ctx->pages = kmalloc(ctx->num_pages * sizeof(u8 *), GFP_ATOMIC);
 566         if (ctx->pages == NULL){
 567                 QETH_DBF_TEXT(trace, 2, "ceddpcn2");
 568                 kfree(ctx);
 569                 return NULL;
 570         }
 571         memset(ctx->pages, 0, ctx->num_pages * sizeof(u8 *));
 572         for (i = 0; i < ctx->num_pages; ++i){
 573                 addr = (u8 *)__get_free_page(GFP_ATOMIC);
 574                 if (addr == NULL){
 575                         QETH_DBF_TEXT(trace, 2, "ceddpcn3");
 576                         ctx->num_pages = i;
 577                         qeth_eddp_free_context(ctx);
 578                         return NULL;
 579                 }
 580                 memset(addr, 0, PAGE_SIZE);
 581                 ctx->pages[i] = addr;
 582         }
 583         ctx->elements = kmalloc(ctx->num_elements *
 584                                 sizeof(struct qeth_eddp_element), GFP_ATOMIC);
 585         if (ctx->elements == NULL){
 586                 QETH_DBF_TEXT(trace, 2, "ceddpcn4");
 587                 qeth_eddp_free_context(ctx);
 588                 return NULL;
 589         }
 590         memset(ctx->elements, 0,
 591                ctx->num_elements * sizeof(struct qeth_eddp_element));
 592         /* reset num_elements; will be incremented again in fill_buffer to
 593          * reflect number of actually used elements */
 594         ctx->num_elements = 0;
 595         return ctx;
 596 }
 597
 598 static inline struct qeth_eddp_context *
 599 qeth_eddp_create_context_tcp(struct qeth_card *card, struct sk_buff *skb,
 600                              struct qeth_hdr *qhdr)
 601 {
 602         struct qeth_eddp_context *ctx = NULL;
 603
 604         QETH_DBF_TEXT(trace, 5, "creddpct");
 605         if (skb->protocol == ETH_P_IP)
 606                 ctx = qeth_eddp_create_context_generic(card, skb,
 607                         sizeof(struct qeth_hdr) + skb->nh.iph->ihl*4 +
 608                         skb->h.th->doff*4);
 609         else if (skb->protocol == ETH_P_IPV6)
 610                 ctx = qeth_eddp_create_context_generic(card, skb,
 611                         sizeof(struct qeth_hdr) + sizeof(struct ipv6hdr) +
 612                         skb->h.th->doff*4);
 613         else
 614                 QETH_DBF_TEXT(trace, 2, "cetcpinv");
 615
 616         if (ctx == NULL) {
 617                 QETH_DBF_TEXT(trace, 2, "creddpnl");
 618                 return NULL;
 619         }
 620         if (qeth_eddp_fill_context_tcp(ctx, skb, qhdr)){
 621                 QETH_DBF_TEXT(trace, 2, "ceddptfe");
 622                 qeth_eddp_free_context(ctx);
 623                 return NULL;
 624         }
 625         atomic_set(&ctx->refcnt, 1);
 626         return ctx;
 627 }
 628
 629 struct qeth_eddp_context *
 630 qeth_eddp_create_context(struct qeth_card *card, struct sk_buff *skb,
 631                          struct qeth_hdr *qhdr)
 632 {
 633         QETH_DBF_TEXT(trace, 5, "creddpc");
 634         switch (skb->sk->sk_protocol){
 635         case IPPROTO_TCP:
 636                 return qeth_eddp_create_context_tcp(card, skb, qhdr);
 637         default:
 638                 QETH_DBF_TEXT(trace, 2, "eddpinvp");
 639         }
 640         return NULL;
 641 }
 642
 643