git.oblomov.eu Git - linux-2.6/blob - 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                                 QETH_DBF_MESSAGE(2, "could only partially fill"
 126                                         "eddp 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                                 goto out_check;
 147                         }
 148                 }
 149                 buffer = buf->buffer;
 150                 /* fill one skb into buffer */
 151                 for (i = 0; i < ctx->elements_per_skb; ++i) {
 152                         if (ctx->elements[element].length != 0) {
 153                                 buffer->element[buf->next_element_to_fill].
 154                                 addr = ctx->elements[element].addr;
 155                                 buffer->element[buf->next_element_to_fill].
 156                                 length = ctx->elements[element].length;
 157                                 buffer->element[buf->next_element_to_fill].
 158                                 flags = ctx->elements[element].flags;
 159                                 buf->next_element_to_fill++;
 160                         }
 161                         element++;
 162                         elements--;
 163                 }
 164         }
 165 out_check:
 166         if (!queue->do_pack) {
 167                 QETH_DBF_TEXT(TRACE, 6, "fillbfnp");
 168                 /* set state to PRIMED -> will be flushed */
 169                 if (buf->next_element_to_fill > 0) {
 170                         atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
 171                         flush_cnt++;
 172                 }
 173         } else {
 174                 if (queue->card->options.performance_stats)
 175                         queue->card->perf_stats.skbs_sent_pack++;
 176                 QETH_DBF_TEXT(TRACE, 6, "fillbfpa");
 177                 if (buf->next_element_to_fill >=
 178                                 QETH_MAX_BUFFER_ELEMENTS(queue->card)) {
 179                         /*
 180                          * packed buffer if full -> set state PRIMED
 181                          * -> will be flushed
 182                          */
 183                         atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
 184                         flush_cnt++;
 185                 }
 186         }
 187 out:
 188         return flush_cnt;
 189 }
 190
 191 static void qeth_eddp_create_segment_hdrs(struct qeth_eddp_context *ctx,
 192                 struct qeth_eddp_data *eddp, int data_len)
 193 {
 194         u8 *page;
 195         int page_remainder;
 196         int page_offset;
 197         int pkt_len;
 198         struct qeth_eddp_element *element;
 199
 200         QETH_DBF_TEXT(TRACE, 5, "eddpcrsh");
 201         page = ctx->pages[ctx->offset >> PAGE_SHIFT];
 202         page_offset = ctx->offset % PAGE_SIZE;
 203         element = &ctx->elements[ctx->num_elements];
 204         pkt_len = eddp->nhl + eddp->thl + data_len;
 205         /* FIXME: layer2 and VLAN !!! */
 206         if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2)
 207                 pkt_len += ETH_HLEN;
 208         if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q))
 209                 pkt_len += VLAN_HLEN;
 210         /* does complete packet fit in current page ? */
 211         page_remainder = PAGE_SIZE - page_offset;
 212         if (page_remainder < (sizeof(struct qeth_hdr) + pkt_len)) {
 213                 /* no -> go to start of next page */
 214                 ctx->offset += page_remainder;
 215                 page = ctx->pages[ctx->offset >> PAGE_SHIFT];
 216                 page_offset = 0;
 217         }
 218         memcpy(page + page_offset, &eddp->qh, sizeof(struct qeth_hdr));
 219         element->addr = page + page_offset;
 220         element->length = sizeof(struct qeth_hdr);
 221         ctx->offset += sizeof(struct qeth_hdr);
 222         page_offset += sizeof(struct qeth_hdr);
 223         /* add mac header (?) */
 224         if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
 225                 memcpy(page + page_offset, &eddp->mac, ETH_HLEN);
 226                 element->length += ETH_HLEN;
 227                 ctx->offset += ETH_HLEN;
 228                 page_offset += ETH_HLEN;
 229         }
 230         /* add VLAN tag */
 231         if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) {
 232                 memcpy(page + page_offset, &eddp->vlan, VLAN_HLEN);
 233                 element->length += VLAN_HLEN;
 234                 ctx->offset += VLAN_HLEN;
 235                 page_offset += VLAN_HLEN;
 236         }
 237         /* add network header */
 238         memcpy(page + page_offset, (u8 *)&eddp->nh, eddp->nhl);
 239         element->length += eddp->nhl;
 240         eddp->nh_in_ctx = page + page_offset;
 241         ctx->offset += eddp->nhl;
 242         page_offset += eddp->nhl;
 243         /* add transport header */
 244         memcpy(page + page_offset, (u8 *)&eddp->th, eddp->thl);
 245         element->length += eddp->thl;
 246         eddp->th_in_ctx = page + page_offset;
 247         ctx->offset += eddp->thl;
 248 }
 249
 250 static void qeth_eddp_copy_data_tcp(char *dst, struct qeth_eddp_data *eddp,
 251                 int len, __wsum *hcsum)
 252 {
 253         struct skb_frag_struct *frag;
 254         int left_in_frag;
 255         int copy_len;
 256         u8 *src;
 257
 258         QETH_DBF_TEXT(TRACE, 5, "eddpcdtc");
 259         if (skb_shinfo(eddp->skb)->nr_frags == 0) {
 260                 skb_copy_from_linear_data_offset(eddp->skb, eddp->skb_offset,
 261                                                  dst, len);
 262                 *hcsum = csum_partial(eddp->skb->data + eddp->skb_offset, len,
 263                                       *hcsum);
 264                 eddp->skb_offset += len;
 265         } else {
 266                 while (len > 0) {
 267                         if (eddp->frag < 0) {
 268                                 /* we're in skb->data */
 269                                 left_in_frag = (eddp->skb->len -
 270                                                 eddp->skb->data_len)
 271                                                 - eddp->skb_offset;
 272                                 src = eddp->skb->data + eddp->skb_offset;
 273                         } else {
 274                                 frag = &skb_shinfo(eddp->skb)->frags[
 275                                         eddp->frag];
 276                                 left_in_frag = frag->size - eddp->frag_offset;
 277                                 src = (u8 *)((page_to_pfn(frag->page) <<
 278                                         PAGE_SHIFT) + frag->page_offset +
 279                                         eddp->frag_offset);
 280                         }
 281                         if (left_in_frag <= 0) {
 282                                 eddp->frag++;
 283                                 eddp->frag_offset = 0;
 284                                 continue;
 285                         }
 286                         copy_len = min(left_in_frag, len);
 287                         memcpy(dst, src, copy_len);
 288                         *hcsum = csum_partial(src, copy_len, *hcsum);
 289                         dst += copy_len;
 290                         eddp->frag_offset += copy_len;
 291                         eddp->skb_offset += copy_len;
 292                         len -= copy_len;
 293                 }
 294         }
 295 }
 296
 297 static void qeth_eddp_create_segment_data_tcp(struct qeth_eddp_context *ctx,
 298                 struct qeth_eddp_data *eddp, int data_len, __wsum hcsum)
 299 {
 300         u8 *page;
 301         int page_remainder;
 302         int page_offset;
 303         struct qeth_eddp_element *element;
 304         int first_lap = 1;
 305
 306         QETH_DBF_TEXT(TRACE, 5, "eddpcsdt");
 307         page = ctx->pages[ctx->offset >> PAGE_SHIFT];
 308         page_offset = ctx->offset % PAGE_SIZE;
 309         element = &ctx->elements[ctx->num_elements];
 310         while (data_len) {
 311                 page_remainder = PAGE_SIZE - page_offset;
 312                 if (page_remainder < data_len) {
 313                         qeth_eddp_copy_data_tcp(page + page_offset, eddp,
 314                                                 page_remainder, &hcsum);
 315                         element->length += page_remainder;
 316                         if (first_lap)
 317                                 element->flags = SBAL_FLAGS_FIRST_FRAG;
 318                         else
 319                                 element->flags = SBAL_FLAGS_MIDDLE_FRAG;
 320                         ctx->num_elements++;
 321                         element++;
 322                         data_len -= page_remainder;
 323                         ctx->offset += page_remainder;
 324                         page = ctx->pages[ctx->offset >> PAGE_SHIFT];
 325                         page_offset = 0;
 326                         element->addr = page + page_offset;
 327                 } else {
 328                         qeth_eddp_copy_data_tcp(page + page_offset, eddp,
 329                                                 data_len, &hcsum);
 330                         element->length += data_len;
 331                         if (!first_lap)
 332                                 element->flags = SBAL_FLAGS_LAST_FRAG;
 333                         ctx->num_elements++;
 334                         ctx->offset += data_len;
 335                         data_len = 0;
 336                 }
 337                 first_lap = 0;
 338         }
 339         ((struct tcphdr *)eddp->th_in_ctx)->check = csum_fold(hcsum);
 340 }
 341
 342 static __wsum qeth_eddp_check_tcp4_hdr(struct qeth_eddp_data *eddp,
 343                 int data_len)
 344 {
 345         __wsum phcsum; /* pseudo header checksum */
 346
 347         QETH_DBF_TEXT(TRACE, 5, "eddpckt4");
 348         eddp->th.tcp.h.check = 0;
 349         /* compute pseudo header checksum */
 350         phcsum = csum_tcpudp_nofold(eddp->nh.ip4.h.saddr, eddp->nh.ip4.h.daddr,
 351                                     eddp->thl + data_len, IPPROTO_TCP, 0);
 352         /* compute checksum of tcp header */
 353         return csum_partial((u8 *)&eddp->th, eddp->thl, phcsum);
 354 }
 355
 356 static __wsum qeth_eddp_check_tcp6_hdr(struct qeth_eddp_data *eddp,
 357                 int data_len)
 358 {
 359         __be32 proto;
 360         __wsum phcsum; /* pseudo header checksum */
 361
 362         QETH_DBF_TEXT(TRACE, 5, "eddpckt6");
 363         eddp->th.tcp.h.check = 0;
 364         /* compute pseudo header checksum */
 365         phcsum = csum_partial((u8 *)&eddp->nh.ip6.h.saddr,
 366                               sizeof(struct in6_addr), 0);
 367         phcsum = csum_partial((u8 *)&eddp->nh.ip6.h.daddr,
 368                               sizeof(struct in6_addr), phcsum);
 369         proto = htonl(IPPROTO_TCP);
 370         phcsum = csum_partial((u8 *)&proto, sizeof(u32), phcsum);
 371         return phcsum;
 372 }
 373
 374 static struct qeth_eddp_data *qeth_eddp_create_eddp_data(struct qeth_hdr *qh,
 375                 u8 *nh, u8 nhl, u8 *th, u8 thl)
 376 {
 377         struct qeth_eddp_data *eddp;
 378
 379         QETH_DBF_TEXT(TRACE, 5, "eddpcrda");
 380         eddp = kzalloc(sizeof(struct qeth_eddp_data), GFP_ATOMIC);
 381         if (eddp) {
 382                 eddp->nhl = nhl;
 383                 eddp->thl = thl;
 384                 memcpy(&eddp->qh, qh, sizeof(struct qeth_hdr));
 385                 memcpy(&eddp->nh, nh, nhl);
 386                 memcpy(&eddp->th, th, thl);
 387                 eddp->frag = -1; /* initially we're in skb->data */
 388         }
 389         return eddp;
 390 }
 391
 392 static void __qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx,
 393                 struct qeth_eddp_data *eddp)
 394 {
 395         struct tcphdr *tcph;
 396         int data_len;
 397         __wsum hcsum;
 398
 399         QETH_DBF_TEXT(TRACE, 5, "eddpftcp");
 400         eddp->skb_offset = sizeof(struct qeth_hdr) + eddp->nhl + eddp->thl;
 401         if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
 402                 eddp->skb_offset += sizeof(struct ethhdr);
 403                 if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q))
 404                         eddp->skb_offset += VLAN_HLEN;
 405         }
 406         tcph = tcp_hdr(eddp->skb);
 407         while (eddp->skb_offset < eddp->skb->len) {
 408                 data_len = min((int)skb_shinfo(eddp->skb)->gso_size,
 409                                (int)(eddp->skb->len - eddp->skb_offset));
 410                 /* prepare qdio hdr */
 411                 if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
 412                         eddp->qh.hdr.l2.pkt_length = data_len + ETH_HLEN +
 413                                                      eddp->nhl + eddp->thl;
 414                         if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q))
 415                                 eddp->qh.hdr.l2.pkt_length += VLAN_HLEN;
 416                 } else
 417                         eddp->qh.hdr.l3.length = data_len + eddp->nhl +
 418                                                  eddp->thl;
 419                 /* prepare ip hdr */
 420                 if (eddp->skb->protocol == htons(ETH_P_IP)) {
 421                         eddp->nh.ip4.h.tot_len = htons(data_len + eddp->nhl +
 422                                                  eddp->thl);
 423                         eddp->nh.ip4.h.check = 0;
 424                         eddp->nh.ip4.h.check =
 425                                 ip_fast_csum((u8 *)&eddp->nh.ip4.h,
 426                                                 eddp->nh.ip4.h.ihl);
 427                 } else
 428                         eddp->nh.ip6.h.payload_len = htons(data_len +
 429                                                                 eddp->thl);
 430                 /* prepare tcp hdr */
 431                 if (data_len == (eddp->skb->len - eddp->skb_offset)) {
 432                         /* last segment -> set FIN and PSH flags */
 433                         eddp->th.tcp.h.fin = tcph->fin;
 434                         eddp->th.tcp.h.psh = tcph->psh;
 435                 }
 436                 if (eddp->skb->protocol == htons(ETH_P_IP))
 437                         hcsum = qeth_eddp_check_tcp4_hdr(eddp, data_len);
 438                 else
 439                         hcsum = qeth_eddp_check_tcp6_hdr(eddp, data_len);
 440                 /* fill the next segment into the context */
 441                 qeth_eddp_create_segment_hdrs(ctx, eddp, data_len);
 442                 qeth_eddp_create_segment_data_tcp(ctx, eddp, data_len, hcsum);
 443                 if (eddp->skb_offset >= eddp->skb->len)
 444                         break;
 445                 /* prepare headers for next round */
 446                 if (eddp->skb->protocol == htons(ETH_P_IP))
 447                         eddp->nh.ip4.h.id = htons(ntohs(eddp->nh.ip4.h.id) + 1);
 448                 eddp->th.tcp.h.seq = htonl(ntohl(eddp->th.tcp.h.seq) +
 449                         data_len);
 450         }
 451 }
 452
 453 static int qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx,
 454                 struct sk_buff *skb, struct qeth_hdr *qhdr)
 455 {
 456         struct qeth_eddp_data *eddp = NULL;
 457
 458         QETH_DBF_TEXT(TRACE, 5, "eddpficx");
 459         /* create our segmentation headers and copy original headers */
 460         if (skb->protocol == htons(ETH_P_IP))
 461                 eddp = qeth_eddp_create_eddp_data(qhdr,
 462                                                   skb_network_header(skb),
 463                                                   ip_hdrlen(skb),
 464                                                   skb_transport_header(skb),
 465                                                   tcp_hdrlen(skb));
 466         else
 467                 eddp = qeth_eddp_create_eddp_data(qhdr,
 468                                                   skb_network_header(skb),
 469                                                   sizeof(struct ipv6hdr),
 470                                                   skb_transport_header(skb),
 471                                                   tcp_hdrlen(skb));
 472
 473         if (eddp == NULL) {
 474                 QETH_DBF_TEXT(TRACE, 2, "eddpfcnm");
 475                 return -ENOMEM;
 476         }
 477         if (qhdr->hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
 478                 skb_set_mac_header(skb, sizeof(struct qeth_hdr));
 479                 memcpy(&eddp->mac, eth_hdr(skb), ETH_HLEN);
 480                 if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) {
 481                         eddp->vlan[0] = skb->protocol;
 482                         eddp->vlan[1] = htons(vlan_tx_tag_get(skb));
 483                 }
 484         }
 485         /* the next flags will only be set on the last segment */
 486         eddp->th.tcp.h.fin = 0;
 487         eddp->th.tcp.h.psh = 0;
 488         eddp->skb = skb;
 489         /* begin segmentation and fill context */
 490         __qeth_eddp_fill_context_tcp(ctx, eddp);
 491         kfree(eddp);
 492         return 0;
 493 }
 494
 495 static void qeth_eddp_calc_num_pages(struct qeth_eddp_context *ctx,
 496                 struct sk_buff *skb, int hdr_len)
 497 {
 498         int skbs_per_page;
 499
 500         QETH_DBF_TEXT(TRACE, 5, "eddpcanp");
 501         /* can we put multiple skbs in one page? */
 502         skbs_per_page = PAGE_SIZE / (skb_shinfo(skb)->gso_size + hdr_len);
 503         if (skbs_per_page > 1) {
 504                 ctx->num_pages = (skb_shinfo(skb)->gso_segs + 1) /
 505                                  skbs_per_page + 1;
 506                 ctx->elements_per_skb = 1;
 507         } else {
 508                 /* no -> how many elements per skb? */
 509                 ctx->elements_per_skb = (skb_shinfo(skb)->gso_size + hdr_len +
 510                                      PAGE_SIZE) >> PAGE_SHIFT;
 511                 ctx->num_pages = ctx->elements_per_skb *
 512                                  (skb_shinfo(skb)->gso_segs + 1);
 513         }
 514         ctx->num_elements = ctx->elements_per_skb *
 515                             (skb_shinfo(skb)->gso_segs + 1);
 516 }
 517
 518 static struct qeth_eddp_context *qeth_eddp_create_context_generic(
 519                 struct qeth_card *card, struct sk_buff *skb, int hdr_len)
 520 {
 521         struct qeth_eddp_context *ctx = NULL;
 522         u8 *addr;
 523         int i;
 524
 525         QETH_DBF_TEXT(TRACE, 5, "creddpcg");
 526         /* create the context and allocate pages */
 527         ctx = kzalloc(sizeof(struct qeth_eddp_context), GFP_ATOMIC);
 528         if (ctx == NULL) {
 529                 QETH_DBF_TEXT(TRACE, 2, "ceddpcn1");
 530                 return NULL;
 531         }
 532         ctx->type = QETH_LARGE_SEND_EDDP;
 533         qeth_eddp_calc_num_pages(ctx, skb, hdr_len);
 534         if (ctx->elements_per_skb > QETH_MAX_BUFFER_ELEMENTS(card)) {
 535                 QETH_DBF_TEXT(TRACE, 2, "ceddpcis");
 536                 kfree(ctx);
 537                 return NULL;
 538         }
 539         ctx->pages = kcalloc(ctx->num_pages, sizeof(u8 *), GFP_ATOMIC);
 540         if (ctx->pages == NULL) {
 541                 QETH_DBF_TEXT(TRACE, 2, "ceddpcn2");
 542                 kfree(ctx);
 543                 return NULL;
 544         }
 545         for (i = 0; i < ctx->num_pages; ++i) {
 546                 addr = (u8 *)get_zeroed_page(GFP_ATOMIC);
 547                 if (addr == NULL) {
 548                         QETH_DBF_TEXT(TRACE, 2, "ceddpcn3");
 549                         ctx->num_pages = i;
 550                         qeth_eddp_free_context(ctx);
 551                         return NULL;
 552                 }
 553                 ctx->pages[i] = addr;
 554         }
 555         ctx->elements = kcalloc(ctx->num_elements,
 556                                 sizeof(struct qeth_eddp_element), GFP_ATOMIC);
 557         if (ctx->elements == NULL) {
 558                 QETH_DBF_TEXT(TRACE, 2, "ceddpcn4");
 559                 qeth_eddp_free_context(ctx);
 560                 return NULL;
 561         }
 562         /* reset num_elements; will be incremented again in fill_buffer to
 563          * reflect number of actually used elements */
 564         ctx->num_elements = 0;
 565         return ctx;
 566 }
 567
 568 static struct qeth_eddp_context *qeth_eddp_create_context_tcp(
 569                 struct qeth_card *card, struct sk_buff *skb,
 570                 struct qeth_hdr *qhdr)
 571 {
 572         struct qeth_eddp_context *ctx = NULL;
 573
 574         QETH_DBF_TEXT(TRACE, 5, "creddpct");
 575         if (skb->protocol == htons(ETH_P_IP))
 576                 ctx = qeth_eddp_create_context_generic(card, skb,
 577                                                 (sizeof(struct qeth_hdr) +
 578                                                 ip_hdrlen(skb) +
 579                                                 tcp_hdrlen(skb)));
 580         else if (skb->protocol == htons(ETH_P_IPV6))
 581                 ctx = qeth_eddp_create_context_generic(card, skb,
 582                         sizeof(struct qeth_hdr) + sizeof(struct ipv6hdr) +
 583                         tcp_hdrlen(skb));
 584         else
 585                 QETH_DBF_TEXT(TRACE, 2, "cetcpinv");
 586
 587         if (ctx == NULL) {
 588                 QETH_DBF_TEXT(TRACE, 2, "creddpnl");
 589                 return NULL;
 590         }
 591         if (qeth_eddp_fill_context_tcp(ctx, skb, qhdr)) {
 592                 QETH_DBF_TEXT(TRACE, 2, "ceddptfe");
 593                 qeth_eddp_free_context(ctx);
 594                 return NULL;
 595         }
 596         atomic_set(&ctx->refcnt, 1);
 597         return ctx;
 598 }
 599
 600 struct qeth_eddp_context *qeth_eddp_create_context(struct qeth_card *card,
 601                 struct sk_buff *skb, struct qeth_hdr *qhdr,
 602                 unsigned char sk_protocol)
 603 {
 604         QETH_DBF_TEXT(TRACE, 5, "creddpc");
 605         switch (sk_protocol) {
 606         case IPPROTO_TCP:
 607                 return qeth_eddp_create_context_tcp(card, skb, qhdr);
 608         default:
 609                 QETH_DBF_TEXT(TRACE, 2, "eddpinvp");
 610         }
 611         return NULL;
 612 }
 613 EXPORT_SYMBOL_GPL(qeth_eddp_create_context);
 614
 615 void qeth_tso_fill_header(struct qeth_card *card, struct qeth_hdr *qhdr,
 616                 struct sk_buff *skb)
 617 {
 618         struct qeth_hdr_tso *hdr = (struct qeth_hdr_tso *)qhdr;
 619         struct tcphdr *tcph = tcp_hdr(skb);
 620         struct iphdr *iph = ip_hdr(skb);
 621         struct ipv6hdr *ip6h = ipv6_hdr(skb);
 622
 623         QETH_DBF_TEXT(TRACE, 5, "tsofhdr");
 624
 625         /*fix header to TSO values ...*/
 626         hdr->hdr.hdr.l3.id = QETH_HEADER_TYPE_TSO;
 627         /*set values which are fix for the first approach ...*/
 628         hdr->ext.hdr_tot_len = (__u16) sizeof(struct qeth_hdr_ext_tso);
 629         hdr->ext.imb_hdr_no  = 1;
 630         hdr->ext.hdr_type    = 1;
 631         hdr->ext.hdr_version = 1;
 632         hdr->ext.hdr_len     = 28;
 633         /*insert non-fix values */
 634         hdr->ext.mss = skb_shinfo(skb)->gso_size;
 635         hdr->ext.dg_hdr_len = (__u16)(iph->ihl*4 + tcph->doff*4);
 636         hdr->ext.payload_len = (__u16)(skb->len - hdr->ext.dg_hdr_len -
 637                                        sizeof(struct qeth_hdr_tso));
 638         tcph->check = 0;
 639         if (skb->protocol == ETH_P_IPV6) {
 640                 ip6h->payload_len = 0;
 641                 tcph->check = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 642                                                0, IPPROTO_TCP, 0);
 643         } else {
 644                 /*OSA want us to set these values ...*/
 645                 tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
 646                                          0, IPPROTO_TCP, 0);
 647                 iph->tot_len = 0;
 648                 iph->check = 0;
 649         }
 650 }
 651 EXPORT_SYMBOL_GPL(qeth_tso_fill_header);
 652
 653 void qeth_tx_csum(struct sk_buff *skb)
 654 {
 655         int tlen;
 656         if (skb->protocol == htons(ETH_P_IP)) {
 657                 tlen = ntohs(ip_hdr(skb)->tot_len) - (ip_hdr(skb)->ihl << 2);
 658                 switch (ip_hdr(skb)->protocol) {
 659                 case IPPROTO_TCP:
 660                         tcp_hdr(skb)->check = 0;
 661                         tcp_hdr(skb)->check = csum_tcpudp_magic(
 662                                 ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
 663                                 tlen, ip_hdr(skb)->protocol,
 664                                 skb_checksum(skb, skb_transport_offset(skb),
 665                                         tlen, 0));
 666                         break;
 667                 case IPPROTO_UDP:
 668                         udp_hdr(skb)->check = 0;
 669                         udp_hdr(skb)->check = csum_tcpudp_magic(
 670                                 ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
 671                                 tlen, ip_hdr(skb)->protocol,
 672                                 skb_checksum(skb, skb_transport_offset(skb),
 673                                         tlen, 0));
 674                         break;
 675                 }
 676         } else if (skb->protocol == htons(ETH_P_IPV6)) {
 677                 switch (ipv6_hdr(skb)->nexthdr) {
 678                 case IPPROTO_TCP:
 679                         tcp_hdr(skb)->check = 0;
 680                         tcp_hdr(skb)->check = csum_ipv6_magic(
 681                                 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
 682                                 ipv6_hdr(skb)->payload_len,
 683                                 ipv6_hdr(skb)->nexthdr,
 684                                 skb_checksum(skb, skb_transport_offset(skb),
 685                                         ipv6_hdr(skb)->payload_len, 0));
 686                         break;
 687                 case IPPROTO_UDP:
 688                         udp_hdr(skb)->check = 0;
 689                         udp_hdr(skb)->check = csum_ipv6_magic(
 690                                 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
 691                                 ipv6_hdr(skb)->payload_len,
 692                                 ipv6_hdr(skb)->nexthdr,
 693                                 skb_checksum(skb, skb_transport_offset(skb),
 694                                         ipv6_hdr(skb)->payload_len, 0));
 695                         break;
 696                 }
 697         }
 698 }
 699 EXPORT_SYMBOL_GPL(qeth_tx_csum);