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