drivers/s390/net/qeth_eddp.c

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