drivers/s390/net/qeth_core_offl.c

   1 /*
   2  *  drivers/s390/net/qeth_core_offl.c
   3  *
   4  *    Copyright IBM Corp. 2007
   5  *    Author(s): Thomas Spatzier <tspat@de.ibm.com>,
   6  *               Frank Blaschka <frank.blaschka@de.ibm.com>
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/ip.h>
  11 #include <linux/inetdevice.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/kernel.h>
  14 #include <linux/tcp.h>
  15 #include <net/tcp.h>
  16 #include <linux/skbuff.h>
  17
  18 #include <net/ip.h>
  19 #include <net/ip6_checksum.h>
  20
  21 #include "qeth_core.h"
  22 #include "qeth_core_mpc.h"
  23 #include "qeth_core_offl.h"
  24
  25 int qeth_eddp_check_buffers_for_context(struct qeth_qdio_out_q *queue,
  26                 struct qeth_eddp_context *ctx)
  27 {
  28         int index = queue->next_buf_to_fill;
  29         int elements_needed = ctx->num_elements;
  30         int elements_in_buffer;
  31         int skbs_in_buffer;
  32         int buffers_needed = 0;
  33
  34         QETH_DBF_TEXT(trace, 5, "eddpcbfc");
  35         while (elements_needed > 0) {
  36                 buffers_needed++;
  37                 if (atomic_read(&queue->bufs[index].state) !=
  38                                 QETH_QDIO_BUF_EMPTY)
  39                         return -EBUSY;
  40
  41                 elements_in_buffer = QETH_MAX_BUFFER_ELEMENTS(queue->card) -
  42                                      queue->bufs[index].next_element_to_fill;
  43                 skbs_in_buffer = elements_in_buffer / ctx->elements_per_skb;
  44                 elements_needed -= skbs_in_buffer * ctx->elements_per_skb;
  45                 index = (index + 1) % QDIO_MAX_BUFFERS_PER_Q;
  46         }
  47         return buffers_needed;
  48 }
  49
  50 static void qeth_eddp_free_context(struct qeth_eddp_context *ctx)
  51 {
  52         int i;
  53
  54         QETH_DBF_TEXT(trace, 5, "eddpfctx");
  55         for (i = 0; i < ctx->num_pages; ++i)
  56                 free_page((unsigned long)ctx->pages[i]);
  57         kfree(ctx->pages);
  58         kfree(ctx->elements);
  59         kfree(ctx);
  60 }
  61
  62
  63 static void qeth_eddp_get_context(struct qeth_eddp_context *ctx)
  64 {
  65         atomic_inc(&ctx->refcnt);
  66 }
  67
  68 void qeth_eddp_put_context(struct qeth_eddp_context *ctx)
  69 {
  70         if (atomic_dec_return(&ctx->refcnt) == 0)
  71                 qeth_eddp_free_context(ctx);
  72 }
  73 EXPORT_SYMBOL_GPL(qeth_eddp_put_context);
  74
  75 void qeth_eddp_buf_release_contexts(struct qeth_qdio_out_buffer *buf)
  76 {
  77         struct qeth_eddp_context_reference *ref;
  78
  79         QETH_DBF_TEXT(trace, 6, "eddprctx");
  80         while (!list_empty(&buf->ctx_list)) {
  81                 ref = list_entry(buf->ctx_list.next,
  82                                  struct qeth_eddp_context_reference, list);
  83                 qeth_eddp_put_context(ref->ctx);
  84                 list_del(&ref->list);
  85                 kfree(ref);
  86         }
  87 }
  88
  89 static int qeth_eddp_buf_ref_context(struct qeth_qdio_out_buffer *buf,
  90                 struct qeth_eddp_context *ctx)
  91 {
  92         struct qeth_eddp_context_reference *ref;
  93
  94         QETH_DBF_TEXT(trace, 6, "eddprfcx");
  95         ref = kmalloc(sizeof(struct qeth_eddp_context_reference), GFP_ATOMIC);
  96         if (ref == NULL)
  97                 return -ENOMEM;
  98         qeth_eddp_get_context(ctx);
  99         ref->ctx = ctx;
 100         list_add_tail(&ref->list, &buf->ctx_list);
 101         return 0;
 102 }
 103
 104 int qeth_eddp_fill_buffer(struct qeth_qdio_out_q *queue,
 105                 struct qeth_eddp_context *ctx, int index)
 106 {
 107         struct qeth_qdio_out_buffer *buf = NULL;
 108         struct qdio_buffer *buffer;
 109         int elements = ctx->num_elements;
 110         int element = 0;
 111         int flush_cnt = 0;
 112         int must_refcnt = 1;
 113         int i;
 114
 115         QETH_DBF_TEXT(trace, 5, "eddpfibu");
 116         while (elements > 0) {
 117                 buf = &queue->bufs[index];
 118                 if (atomic_read(&buf->state) != QETH_QDIO_BUF_EMPTY) {
 119                         /* normally this should not happen since we checked for
 120                          * available elements in qeth_check_elements_for_context
 121                          */
 122                         if (element == 0)
 123                                 return -EBUSY;
 124                         else {
 125                                 PRINT_WARN("could only partially fill eddp "
 126                                            "buffer!\n");
 127                                 goto out;
 128                         }
 129                 }
 130                 /* check if the whole next skb fits into current buffer */
 131                 if ((QETH_MAX_BUFFER_ELEMENTS(queue->card) -
 132                                         buf->next_element_to_fill)
 133                                 < ctx->elements_per_skb){
 134                         /* no -> go to next buffer */
 135                         atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
 136                         index = (index + 1) % QDIO_MAX_BUFFERS_PER_Q;
 137                         flush_cnt++;
 138                         /* new buffer, so we have to add ctx to buffer'ctx_list
 139                          * and increment ctx's refcnt */
 140                         must_refcnt = 1;
 141                         continue;
 142                 }
 143                 if (must_refcnt) {
 144                         must_refcnt = 0;
 145                         if (qeth_eddp_buf_ref_context(buf, ctx)) {
 146                                 PRINT_WARN("no memory to create eddp context "
 147                                            "reference\n");
 148                                 goto out_check;
 149                         }
 150                 }
 151                 buffer = buf->buffer;
 152                 /* fill one skb into buffer */
 153                 for (i = 0; i < ctx->elements_per_skb; ++i) {
 154                         if (ctx->elements[element].length != 0) {
 155                                 buffer->element[buf->next_element_to_fill].
 156                                 addr = ctx->elements[element].addr;
 157                                 buffer->element[buf->next_element_to_fill].
 158                                 length = ctx->elements[element].length;
 159                                 buffer->element[buf->next_element_to_fill].
 160                                 flags = ctx->elements[element].flags;
 161                                 buf->next_element_to_fill++;
 162                         }
 163                         element++;
 164                         elements--;
 165                 }
 166         }
 167 out_check:
 168         if (!queue->do_pack) {
 169                 QETH_DBF_TEXT(trace, 6, "fillbfnp");
 170                 /* set state to PRIMED -> will be flushed */
 171                 if (buf->next_element_to_fill > 0) {
 172                         atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
 173                         flush_cnt++;
 174                 }
 175         } else {
 176                 if (queue->card->options.performance_stats)
 177                         queue->card->perf_stats.skbs_sent_pack++;
 178                 QETH_DBF_TEXT(trace, 6, "fillbfpa");
 179                 if (buf->next_element_to_fill >=
 180                                 QETH_MAX_BUFFER_ELEMENTS(queue->card)) {
 181                         /*
 182                          * packed buffer if full -> set state PRIMED
 183                          * -> will be flushed
 184                          */
 185                         atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
 186                         flush_cnt++;
 187                 }
 188         }
 189 out:
 190         return flush_cnt;
 191 }
 192
 193 static void qeth_eddp_create_segment_hdrs(struct qeth_eddp_context *ctx,
 194                 struct qeth_eddp_data *eddp, int data_len)
 195 {
 196         u8 *page;
 197         int page_remainder;
 198         int page_offset;
 199         int pkt_len;
 200         struct qeth_eddp_element *element;
 201
 202         QETH_DBF_TEXT(trace, 5, "eddpcrsh");
 203         page = ctx->pages[ctx->offset >> PAGE_SHIFT];
 204         page_offset = ctx->offset % PAGE_SIZE;
 205         element = &ctx->elements[ctx->num_elements];
 206         pkt_len = eddp->nhl + eddp->thl + data_len;
 207         /* FIXME: layer2 and VLAN !!! */
 208         if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2)
 209                 pkt_len += ETH_HLEN;
 210         if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q))
 211                 pkt_len += VLAN_HLEN;
 212         /* does complete packet fit in current page ? */
 213         page_remainder = PAGE_SIZE - page_offset;
 214         if (page_remainder < (sizeof(struct qeth_hdr) + pkt_len)) {
 215                 /* no -> go to start of next page */
 216                 ctx->offset += page_remainder;
 217                 page = ctx->pages[ctx->offset >> PAGE_SHIFT];
 218                 page_offset = 0;
 219         }
 220         memcpy(page + page_offset, &eddp->qh, sizeof(struct qeth_hdr));
 221         element->addr = page + page_offset;
 222         element->length = sizeof(struct qeth_hdr);
 223         ctx->offset += sizeof(struct qeth_hdr);
 224         page_offset += sizeof(struct qeth_hdr);
 225         /* add mac header (?) */
 226         if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
 227                 memcpy(page + page_offset, &eddp->mac, ETH_HLEN);
 228                 element->length += ETH_HLEN;
 229                 ctx->offset += ETH_HLEN;
 230                 page_offset += ETH_HLEN;
 231         }
 232         /* add VLAN tag */
 233         if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) {
 234                 memcpy(page + page_offset, &eddp->vlan, VLAN_HLEN);
 235                 element->length += VLAN_HLEN;
 236                 ctx->offset += VLAN_HLEN;
 237                 page_offset += VLAN_HLEN;
 238         }
 239         /* add network header */
 240         memcpy(page + page_offset, (u8 *)&eddp->nh, eddp->nhl);
 241         element->length += eddp->nhl;
 242         eddp->nh_in_ctx = page + page_offset;
 243         ctx->offset += eddp->nhl;
 244         page_offset += eddp->nhl;
 245         /* add transport header */
 246         memcpy(page + page_offset, (u8 *)&eddp->th, eddp->thl);
 247         element->length += eddp->thl;
 248         eddp->th_in_ctx = page + page_offset;
 249         ctx->offset += eddp->thl;
 250 }
 251
 252 static void qeth_eddp_copy_data_tcp(char *dst, struct qeth_eddp_data *eddp,
 253                 int len, __wsum *hcsum)
 254 {
 255         struct skb_frag_struct *frag;
 256         int left_in_frag;
 257         int copy_len;
 258         u8 *src;
 259
 260         QETH_DBF_TEXT(trace, 5, "eddpcdtc");
 261         if (skb_shinfo(eddp->skb)->nr_frags == 0) {
 262                 skb_copy_from_linear_data_offset(eddp->skb, eddp->skb_offset,
 263                                                  dst, len);
 264                 *hcsum = csum_partial(eddp->skb->data + eddp->skb_offset, len,
 265                                       *hcsum);
 266                 eddp->skb_offset += len;
 267         } else {
 268                 while (len > 0) {
 269                         if (eddp->frag < 0) {
 270                                 /* we're in skb->data */
 271                                 left_in_frag = (eddp->skb->len -
 272                                                 eddp->skb->data_len)
 273                                                 - eddp->skb_offset;
 274                                 src = eddp->skb->data + eddp->skb_offset;
 275                         } else {
 276                                 frag = &skb_shinfo(eddp->skb)->frags[
 277                                         eddp->frag];
 278                                 left_in_frag = frag->size - eddp->frag_offset;
 279                                 src = (u8 *)((page_to_pfn(frag->page) <<
 280                                         PAGE_SHIFT) + frag->page_offset +
 281                                         eddp->frag_offset);
 282                         }
 283                         if (left_in_frag <= 0) {
 284                                 eddp->frag++;
 285                                 eddp->frag_offset = 0;
 286                                 continue;
 287                         }
 288                         copy_len = min(left_in_frag, len);
 289                         memcpy(dst, src, copy_len);
 290                         *hcsum = csum_partial(src, copy_len, *hcsum);
 291                         dst += copy_len;
 292                         eddp->frag_offset += copy_len;
 293                         eddp->skb_offset += copy_len;
 294                         len -= copy_len;
 295                 }
 296         }
 297 }
 298
 299 static void qeth_eddp_create_segment_data_tcp(struct qeth_eddp_context *ctx,
 300                 struct qeth_eddp_data *eddp, int data_len, __wsum hcsum)
 301 {
 302         u8 *page;
 303         int page_remainder;
 304         int page_offset;
 305         struct qeth_eddp_element *element;
 306         int first_lap = 1;
 307
 308         QETH_DBF_TEXT(trace, 5, "eddpcsdt");
 309         page = ctx->pages[ctx->offset >> PAGE_SHIFT];
 310         page_offset = ctx->offset % PAGE_SIZE;
 311         element = &ctx->elements[ctx->num_elements];
 312         while (data_len) {
 313                 page_remainder = PAGE_SIZE - page_offset;
 314                 if (page_remainder < data_len) {
 315                         qeth_eddp_copy_data_tcp(page + page_offset, eddp,
 316                                                 page_remainder, &hcsum);
 317                         element->length += page_remainder;
 318                         if (first_lap)
 319                                 element->flags = SBAL_FLAGS_FIRST_FRAG;
 320                         else
 321                                 element->flags = SBAL_FLAGS_MIDDLE_FRAG;
 322                         ctx->num_elements++;
 323                         element++;
 324                         data_len -= page_remainder;
 325                         ctx->offset += page_remainder;
 326                         page = ctx->pages[ctx->offset >> PAGE_SHIFT];
 327                         page_offset = 0;
 328                         element->addr = page + page_offset;
 329                 } else {
 330                         qeth_eddp_copy_data_tcp(page + page_offset, eddp,
 331                                                 data_len, &hcsum);
 332                         element->length += data_len;
 333                         if (!first_lap)
 334                                 element->flags = SBAL_FLAGS_LAST_FRAG;
 335                         ctx->num_elements++;
 336                         ctx->offset += data_len;
 337                         data_len = 0;
 338                 }
 339                 first_lap = 0;
 340         }
 341         ((struct tcphdr *)eddp->th_in_ctx)->check = csum_fold(hcsum);
 342 }
 343
 344 static __wsum qeth_eddp_check_tcp4_hdr(struct qeth_eddp_data *eddp,
 345                 int data_len)
 346 {
 347         __wsum phcsum; /* pseudo header checksum */
 348
 349         QETH_DBF_TEXT(trace, 5, "eddpckt4");
 350         eddp->th.tcp.h.check = 0;
 351         /* compute pseudo header checksum */
 352         phcsum = csum_tcpudp_nofold(eddp->nh.ip4.h.saddr, eddp->nh.ip4.h.daddr,
 353                                     eddp->thl + data_len, IPPROTO_TCP, 0);
 354         /* compute checksum of tcp header */
 355         return csum_partial((u8 *)&eddp->th, eddp->thl, phcsum);
 356 }
 357
 358 static __wsum qeth_eddp_check_tcp6_hdr(struct qeth_eddp_data *eddp,
 359                 int data_len)
 360 {
 361         __be32 proto;
 362         __wsum phcsum; /* pseudo header checksum */
 363
 364         QETH_DBF_TEXT(trace, 5, "eddpckt6");
 365         eddp->th.tcp.h.check = 0;
 366         /* compute pseudo header checksum */
 367         phcsum = csum_partial((u8 *)&eddp->nh.ip6.h.saddr,
 368                               sizeof(struct in6_addr), 0);
 369         phcsum = csum_partial((u8 *)&eddp->nh.ip6.h.daddr,
 370                               sizeof(struct in6_addr), phcsum);
 371         proto = htonl(IPPROTO_TCP);
 372         phcsum = csum_partial((u8 *)&proto, sizeof(u32), phcsum);
 373         return phcsum;
 374 }
 375
 376 static struct qeth_eddp_data *qeth_eddp_create_eddp_data(struct qeth_hdr *qh,
 377                 u8 *nh, u8 nhl, u8 *th, u8 thl)
 378 {
 379         struct qeth_eddp_data *eddp;
 380
 381         QETH_DBF_TEXT(trace, 5, "eddpcrda");
 382         eddp = kzalloc(sizeof(struct qeth_eddp_data), GFP_ATOMIC);
 383         if (eddp) {
 384                 eddp->nhl = nhl;
 385                 eddp->thl = thl;
 386                 memcpy(&eddp->qh, qh, sizeof(struct qeth_hdr));
 387                 memcpy(&eddp->nh, nh, nhl);
 388                 memcpy(&eddp->th, th, thl);
 389                 eddp->frag = -1; /* initially we're in skb->data */
 390         }
 391         return eddp;
 392 }
 393
 394 static void __qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx,
 395                 struct qeth_eddp_data *eddp)
 396 {
 397         struct tcphdr *tcph;
 398         int data_len;
 399         __wsum hcsum;
 400
 401         QETH_DBF_TEXT(trace, 5, "eddpftcp");
 402         eddp->skb_offset = sizeof(struct qeth_hdr) + eddp->nhl + eddp->thl;
 403         if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
 404                 eddp->skb_offset += sizeof(struct ethhdr);
 405                 if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q))
 406                         eddp->skb_offset += VLAN_HLEN;
 407         }
 408         tcph = tcp_hdr(eddp->skb);
 409         while (eddp->skb_offset < eddp->skb->len) {
 410                 data_len = min((int)skb_shinfo(eddp->skb)->gso_size,
 411                                (int)(eddp->skb->len - eddp->skb_offset));
 412                 /* prepare qdio hdr */
 413                 if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
 414                         eddp->qh.hdr.l2.pkt_length = data_len + ETH_HLEN +
 415                                                      eddp->nhl + eddp->thl;
 416                         if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q))
 417                                 eddp->qh.hdr.l2.pkt_length += VLAN_HLEN;
 418                 } else
 419                         eddp->qh.hdr.l3.length = data_len + eddp->nhl +
 420                                                  eddp->thl;
 421                 /* prepare ip hdr */
 422                 if (eddp->skb->protocol == htons(ETH_P_IP)) {
 423                         eddp->nh.ip4.h.tot_len = htons(data_len + eddp->nhl +
 424                                                  eddp->thl);
 425                         eddp->nh.ip4.h.check = 0;
 426                         eddp->nh.ip4.h.check =
 427                                 ip_fast_csum((u8 *)&eddp->nh.ip4.h,
 428                                                 eddp->nh.ip4.h.ihl);
 429                 } else
 430                         eddp->nh.ip6.h.payload_len = htons(data_len +
 431                                                                 eddp->thl);
 432                 /* prepare tcp hdr */
 433                 if (data_len == (eddp->skb->len - eddp->skb_offset)) {
 434                         /* last segment -> set FIN and PSH flags */
 435                         eddp->th.tcp.h.fin = tcph->fin;
 436                         eddp->th.tcp.h.psh = tcph->psh;
 437                 }
 438                 if (eddp->skb->protocol == htons(ETH_P_IP))
 439                         hcsum = qeth_eddp_check_tcp4_hdr(eddp, data_len);
 440                 else
 441                         hcsum = qeth_eddp_check_tcp6_hdr(eddp, data_len);
 442                 /* fill the next segment into the context */
 443                 qeth_eddp_create_segment_hdrs(ctx, eddp, data_len);
 444                 qeth_eddp_create_segment_data_tcp(ctx, eddp, data_len, hcsum);
 445                 if (eddp->skb_offset >= eddp->skb->len)
 446                         break;
 447                 /* prepare headers for next round */
 448                 if (eddp->skb->protocol == htons(ETH_P_IP))
 449                         eddp->nh.ip4.h.id = htons(ntohs(eddp->nh.ip4.h.id) + 1);
 450                 eddp->th.tcp.h.seq = htonl(ntohl(eddp->th.tcp.h.seq) +
 451                         data_len);
 452         }
 453 }
 454
 455 static int qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx,
 456                 struct sk_buff *skb, struct qeth_hdr *qhdr)
 457 {
 458         struct qeth_eddp_data *eddp = NULL;
 459
 460         QETH_DBF_TEXT(trace, 5, "eddpficx");
 461         /* create our segmentation headers and copy original headers */
 462         if (skb->protocol == htons(ETH_P_IP))
 463                 eddp = qeth_eddp_create_eddp_data(qhdr,
 464                                                   skb_network_header(skb),
 465                                                   ip_hdrlen(skb),
 466                                                   skb_transport_header(skb),
 467                                                   tcp_hdrlen(skb));
 468         else
 469                 eddp = qeth_eddp_create_eddp_data(qhdr,
 470                                                   skb_network_header(skb),
 471                                                   sizeof(struct ipv6hdr),
 472                                                   skb_transport_header(skb),
 473                                                   tcp_hdrlen(skb));
 474
 475         if (eddp == NULL) {
 476                 QETH_DBF_TEXT(trace, 2, "eddpfcnm");
 477                 return -ENOMEM;
 478         }
 479         if (qhdr->hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
 480                 skb_set_mac_header(skb, sizeof(struct qeth_hdr));
 481                 memcpy(&eddp->mac, eth_hdr(skb), ETH_HLEN);
 482                 if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) {
 483                         eddp->vlan[0] = skb->protocol;
 484                         eddp->vlan[1] = htons(vlan_tx_tag_get(skb));
 485                 }
 486         }
 487         /* the next flags will only be set on the last segment */
 488         eddp->th.tcp.h.fin = 0;
 489         eddp->th.tcp.h.psh = 0;
 490         eddp->skb = skb;
 491         /* begin segmentation and fill context */
 492         __qeth_eddp_fill_context_tcp(ctx, eddp);
 493         kfree(eddp);
 494         return 0;
 495 }
 496
 497 static void qeth_eddp_calc_num_pages(struct qeth_eddp_context *ctx,
 498                 struct sk_buff *skb, int hdr_len)
 499 {
 500         int skbs_per_page;
 501
 502         QETH_DBF_TEXT(trace, 5, "eddpcanp");
 503         /* can we put multiple skbs in one page? */
 504         skbs_per_page = PAGE_SIZE / (skb_shinfo(skb)->gso_size + hdr_len);
 505         if (skbs_per_page > 1) {
 506                 ctx->num_pages = (skb_shinfo(skb)->gso_segs + 1) /
 507                                  skbs_per_page + 1;
 508                 ctx->elements_per_skb = 1;
 509         } else {
 510                 /* no -> how many elements per skb? */
 511                 ctx->elements_per_skb = (skb_shinfo(skb)->gso_size + hdr_len +
 512                                      PAGE_SIZE) >> PAGE_SHIFT;
 513                 ctx->num_pages = ctx->elements_per_skb *
 514                                  (skb_shinfo(skb)->gso_segs + 1);
 515         }
 516         ctx->num_elements = ctx->elements_per_skb *
 517                             (skb_shinfo(skb)->gso_segs + 1);
 518 }
 519
 520 static struct qeth_eddp_context *qeth_eddp_create_context_generic(
 521                 struct qeth_card *card, struct sk_buff *skb, int hdr_len)
 522 {
 523         struct qeth_eddp_context *ctx = NULL;
 524         u8 *addr;
 525         int i;
 526
 527         QETH_DBF_TEXT(trace, 5, "creddpcg");
 528         /* create the context and allocate pages */
 529         ctx = kzalloc(sizeof(struct qeth_eddp_context), GFP_ATOMIC);
 530         if (ctx == NULL) {
 531                 QETH_DBF_TEXT(trace, 2, "ceddpcn1");
 532                 return NULL;
 533         }
 534         ctx->type = QETH_LARGE_SEND_EDDP;
 535         qeth_eddp_calc_num_pages(ctx, skb, hdr_len);
 536         if (ctx->elements_per_skb > QETH_MAX_BUFFER_ELEMENTS(card)) {
 537                 QETH_DBF_TEXT(trace, 2, "ceddpcis");
 538                 kfree(ctx);
 539                 return NULL;
 540         }
 541         ctx->pages = kcalloc(ctx->num_pages, sizeof(u8 *), GFP_ATOMIC);
 542         if (ctx->pages == NULL) {
 543                 QETH_DBF_TEXT(trace, 2, "ceddpcn2");
 544                 kfree(ctx);
 545                 return NULL;
 546         }
 547         for (i = 0; i < ctx->num_pages; ++i) {
 548                 addr = (u8 *)get_zeroed_page(GFP_ATOMIC);
 549                 if (addr == NULL) {
 550                         QETH_DBF_TEXT(trace, 2, "ceddpcn3");
 551                         ctx->num_pages = i;
 552                         qeth_eddp_free_context(ctx);
 553                         return NULL;
 554                 }
 555                 ctx->pages[i] = addr;
 556         }
 557         ctx->elements = kcalloc(ctx->num_elements,
 558                                 sizeof(struct qeth_eddp_element), GFP_ATOMIC);
 559         if (ctx->elements == NULL) {
 560                 QETH_DBF_TEXT(trace, 2, "ceddpcn4");
 561                 qeth_eddp_free_context(ctx);
 562                 return NULL;
 563         }
 564         /* reset num_elements; will be incremented again in fill_buffer to
 565          * reflect number of actually used elements */
 566         ctx->num_elements = 0;
 567         return ctx;
 568 }
 569
 570 static struct qeth_eddp_context *qeth_eddp_create_context_tcp(
 571                 struct qeth_card *card, struct sk_buff *skb,
 572                 struct qeth_hdr *qhdr)
 573 {
 574         struct qeth_eddp_context *ctx = NULL;
 575
 576         QETH_DBF_TEXT(trace, 5, "creddpct");
 577         if (skb->protocol == htons(ETH_P_IP))
 578                 ctx = qeth_eddp_create_context_generic(card, skb,
 579                                                 (sizeof(struct qeth_hdr) +
 580                                                 ip_hdrlen(skb) +
 581                                                 tcp_hdrlen(skb)));
 582         else if (skb->protocol == htons(ETH_P_IPV6))
 583                 ctx = qeth_eddp_create_context_generic(card, skb,
 584                         sizeof(struct qeth_hdr) + sizeof(struct ipv6hdr) +
 585                         tcp_hdrlen(skb));
 586         else
 587                 QETH_DBF_TEXT(trace, 2, "cetcpinv");
 588
 589         if (ctx == NULL) {
 590                 QETH_DBF_TEXT(trace, 2, "creddpnl");
 591                 return NULL;
 592         }
 593         if (qeth_eddp_fill_context_tcp(ctx, skb, qhdr)) {
 594                 QETH_DBF_TEXT(trace, 2, "ceddptfe");
 595                 qeth_eddp_free_context(ctx);
 596                 return NULL;
 597         }
 598         atomic_set(&ctx->refcnt, 1);
 599         return ctx;
 600 }
 601
 602 struct qeth_eddp_context *qeth_eddp_create_context(struct qeth_card *card,
 603                 struct sk_buff *skb, struct qeth_hdr *qhdr,
 604                 unsigned char sk_protocol)
 605 {
 606         QETH_DBF_TEXT(trace, 5, "creddpc");
 607         switch (sk_protocol) {
 608         case IPPROTO_TCP:
 609                 return qeth_eddp_create_context_tcp(card, skb, qhdr);
 610         default:
 611                 QETH_DBF_TEXT(trace, 2, "eddpinvp");
 612         }
 613         return NULL;
 614 }
 615 EXPORT_SYMBOL_GPL(qeth_eddp_create_context);
 616
 617 void qeth_tso_fill_header(struct qeth_card *card, struct qeth_hdr *qhdr,
 618                 struct sk_buff *skb)
 619 {
 620         struct qeth_hdr_tso *hdr = (struct qeth_hdr_tso *)qhdr;
 621         struct tcphdr *tcph = tcp_hdr(skb);
 622         struct iphdr *iph = ip_hdr(skb);
 623         struct ipv6hdr *ip6h = ipv6_hdr(skb);
 624
 625         QETH_DBF_TEXT(trace, 5, "tsofhdr");
 626
 627         /*fix header to TSO values ...*/
 628         hdr->hdr.hdr.l3.id = QETH_HEADER_TYPE_TSO;
 629         /*set values which are fix for the first approach ...*/
 630         hdr->ext.hdr_tot_len = (__u16) sizeof(struct qeth_hdr_ext_tso);
 631         hdr->ext.imb_hdr_no  = 1;
 632         hdr->ext.hdr_type    = 1;
 633         hdr->ext.hdr_version = 1;
 634         hdr->ext.hdr_len     = 28;
 635         /*insert non-fix values */
 636         hdr->ext.mss = skb_shinfo(skb)->gso_size;
 637         hdr->ext.dg_hdr_len = (__u16)(iph->ihl*4 + tcph->doff*4);
 638         hdr->ext.payload_len = (__u16)(skb->len - hdr->ext.dg_hdr_len -
 639                                        sizeof(struct qeth_hdr_tso));
 640         tcph->check = 0;
 641         if (skb->protocol == ETH_P_IPV6) {
 642                 ip6h->payload_len = 0;
 643                 tcph->check = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 644                                                0, IPPROTO_TCP, 0);
 645         } else {
 646                 /*OSA want us to set these values ...*/
 647                 tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
 648                                          0, IPPROTO_TCP, 0);
 649                 iph->tot_len = 0;
 650                 iph->check = 0;
 651         }
 652 }
 653 EXPORT_SYMBOL_GPL(qeth_tso_fill_header);
 654
 655 void qeth_tx_csum(struct sk_buff *skb)
 656 {
 657         int tlen;
 658         if (skb->protocol == htons(ETH_P_IP)) {
 659                 tlen = ntohs(ip_hdr(skb)->tot_len) - (ip_hdr(skb)->ihl << 2);
 660                 switch (ip_hdr(skb)->protocol) {
 661                 case IPPROTO_TCP:
 662                         tcp_hdr(skb)->check = 0;
 663                         tcp_hdr(skb)->check = csum_tcpudp_magic(
 664                                 ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
 665                                 tlen, ip_hdr(skb)->protocol,
 666                                 skb_checksum(skb, skb_transport_offset(skb),
 667                                         tlen, 0));
 668                         break;
 669                 case IPPROTO_UDP:
 670                         udp_hdr(skb)->check = 0;
 671                         udp_hdr(skb)->check = csum_tcpudp_magic(
 672                                 ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
 673                                 tlen, ip_hdr(skb)->protocol,
 674                                 skb_checksum(skb, skb_transport_offset(skb),
 675                                         tlen, 0));
 676                         break;
 677                 }
 678         } else if (skb->protocol == htons(ETH_P_IPV6)) {
 679                 switch (ipv6_hdr(skb)->nexthdr) {
 680                 case IPPROTO_TCP:
 681                         tcp_hdr(skb)->check = 0;
 682                         tcp_hdr(skb)->check = csum_ipv6_magic(
 683                                 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
 684                                 ipv6_hdr(skb)->payload_len,
 685                                 ipv6_hdr(skb)->nexthdr,
 686                                 skb_checksum(skb, skb_transport_offset(skb),
 687                                         ipv6_hdr(skb)->payload_len, 0));
 688                         break;
 689                 case IPPROTO_UDP:
 690                         udp_hdr(skb)->check = 0;
 691                         udp_hdr(skb)->check = csum_ipv6_magic(
 692                                 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
 693                                 ipv6_hdr(skb)->payload_len,
 694                                 ipv6_hdr(skb)->nexthdr,
 695                                 skb_checksum(skb, skb_transport_offset(skb),
 696                                         ipv6_hdr(skb)->payload_len, 0));
 697                         break;
 698                 }
 699         }
 700 }
 701 EXPORT_SYMBOL_GPL(qeth_tx_csum);