-/*
- * drivers/s390/net/qeth_core_offl.c
- *
- * Copyright IBM Corp. 2007
- * Author(s): Thomas Spatzier <tspat@de.ibm.com>,
- * Frank Blaschka <frank.blaschka@de.ibm.com>
- */
-
-#include <linux/errno.h>
-#include <linux/ip.h>
-#include <linux/inetdevice.h>
-#include <linux/netdevice.h>
-#include <linux/kernel.h>
-#include <linux/tcp.h>
-#include <net/tcp.h>
-#include <linux/skbuff.h>
-
-#include <net/ip.h>
-#include <net/ip6_checksum.h>
-
-#include "qeth_core.h"
-#include "qeth_core_mpc.h"
-#include "qeth_core_offl.h"
-
-int qeth_eddp_check_buffers_for_context(struct qeth_qdio_out_q *queue,
- struct qeth_eddp_context *ctx)
-{
- int index = queue->next_buf_to_fill;
- int elements_needed = ctx->num_elements;
- int elements_in_buffer;
- int skbs_in_buffer;
- int buffers_needed = 0;
-
- QETH_DBF_TEXT(TRACE, 5, "eddpcbfc");
- while (elements_needed > 0) {
- buffers_needed++;
- if (atomic_read(&queue->bufs[index].state) !=
- QETH_QDIO_BUF_EMPTY)
- return -EBUSY;
-
- elements_in_buffer = QETH_MAX_BUFFER_ELEMENTS(queue->card) -
- queue->bufs[index].next_element_to_fill;
- skbs_in_buffer = elements_in_buffer / ctx->elements_per_skb;
- elements_needed -= skbs_in_buffer * ctx->elements_per_skb;
- index = (index + 1) % QDIO_MAX_BUFFERS_PER_Q;
- }
- return buffers_needed;
-}
-
-static void qeth_eddp_free_context(struct qeth_eddp_context *ctx)
-{
- int i;
-
- QETH_DBF_TEXT(TRACE, 5, "eddpfctx");
- for (i = 0; i < ctx->num_pages; ++i)
- free_page((unsigned long)ctx->pages[i]);
- kfree(ctx->pages);
- kfree(ctx->elements);
- kfree(ctx);
-}
-
-
-static void qeth_eddp_get_context(struct qeth_eddp_context *ctx)
-{
- atomic_inc(&ctx->refcnt);
-}
-
-void qeth_eddp_put_context(struct qeth_eddp_context *ctx)
-{
- if (atomic_dec_return(&ctx->refcnt) == 0)
- qeth_eddp_free_context(ctx);
-}
-EXPORT_SYMBOL_GPL(qeth_eddp_put_context);
-
-void qeth_eddp_buf_release_contexts(struct qeth_qdio_out_buffer *buf)
-{
- struct qeth_eddp_context_reference *ref;
-
- QETH_DBF_TEXT(TRACE, 6, "eddprctx");
- while (!list_empty(&buf->ctx_list)) {
- ref = list_entry(buf->ctx_list.next,
- struct qeth_eddp_context_reference, list);
- qeth_eddp_put_context(ref->ctx);
- list_del(&ref->list);
- kfree(ref);
- }
-}
-
-static int qeth_eddp_buf_ref_context(struct qeth_qdio_out_buffer *buf,
- struct qeth_eddp_context *ctx)
-{
- struct qeth_eddp_context_reference *ref;
-
- QETH_DBF_TEXT(TRACE, 6, "eddprfcx");
- ref = kmalloc(sizeof(struct qeth_eddp_context_reference), GFP_ATOMIC);
- if (ref == NULL)
- return -ENOMEM;
- qeth_eddp_get_context(ctx);
- ref->ctx = ctx;
- list_add_tail(&ref->list, &buf->ctx_list);
- return 0;
-}
-
-int qeth_eddp_fill_buffer(struct qeth_qdio_out_q *queue,
- struct qeth_eddp_context *ctx, int index)
-{
- struct qeth_qdio_out_buffer *buf = NULL;
- struct qdio_buffer *buffer;
- int elements = ctx->num_elements;
- int element = 0;
- int flush_cnt = 0;
- int must_refcnt = 1;
- int i;
-
- QETH_DBF_TEXT(TRACE, 5, "eddpfibu");
- while (elements > 0) {
- buf = &queue->bufs[index];
- if (atomic_read(&buf->state) != QETH_QDIO_BUF_EMPTY) {
- /* normally this should not happen since we checked for
- * available elements in qeth_check_elements_for_context
- */
- if (element == 0)
- return -EBUSY;
- else {
- QETH_DBF_MESSAGE(2, "could only partially fill"
- "eddp buffer!\n");
- goto out;
- }
- }
- /* check if the whole next skb fits into current buffer */
- if ((QETH_MAX_BUFFER_ELEMENTS(queue->card) -
- buf->next_element_to_fill)
- < ctx->elements_per_skb){
- /* no -> go to next buffer */
- atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
- index = (index + 1) % QDIO_MAX_BUFFERS_PER_Q;
- flush_cnt++;
- /* new buffer, so we have to add ctx to buffer'ctx_list
- * and increment ctx's refcnt */
- must_refcnt = 1;
- continue;
- }
- if (must_refcnt) {
- must_refcnt = 0;
- if (qeth_eddp_buf_ref_context(buf, ctx)) {
- goto out_check;
- }
- }
- buffer = buf->buffer;
- /* fill one skb into buffer */
- for (i = 0; i < ctx->elements_per_skb; ++i) {
- if (ctx->elements[element].length != 0) {
- buffer->element[buf->next_element_to_fill].
- addr = ctx->elements[element].addr;
- buffer->element[buf->next_element_to_fill].
- length = ctx->elements[element].length;
- buffer->element[buf->next_element_to_fill].
- flags = ctx->elements[element].flags;
- buf->next_element_to_fill++;
- }
- element++;
- elements--;
- }
- }
-out_check:
- if (!queue->do_pack) {
- QETH_DBF_TEXT(TRACE, 6, "fillbfnp");
- /* set state to PRIMED -> will be flushed */
- if (buf->next_element_to_fill > 0) {
- atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
- flush_cnt++;
- }
- } else {
- if (queue->card->options.performance_stats)
- queue->card->perf_stats.skbs_sent_pack++;
- QETH_DBF_TEXT(TRACE, 6, "fillbfpa");
- if (buf->next_element_to_fill >=
- QETH_MAX_BUFFER_ELEMENTS(queue->card)) {
- /*
- * packed buffer if full -> set state PRIMED
- * -> will be flushed
- */
- atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
- flush_cnt++;
- }
- }
-out:
- return flush_cnt;
-}
-
-static void qeth_eddp_create_segment_hdrs(struct qeth_eddp_context *ctx,
- struct qeth_eddp_data *eddp, int data_len)
-{
- u8 *page;
- int page_remainder;
- int page_offset;
- int pkt_len;
- struct qeth_eddp_element *element;
-
- QETH_DBF_TEXT(TRACE, 5, "eddpcrsh");
- page = ctx->pages[ctx->offset >> PAGE_SHIFT];
- page_offset = ctx->offset % PAGE_SIZE;
- element = &ctx->elements[ctx->num_elements];
- pkt_len = eddp->nhl + eddp->thl + data_len;
- /* FIXME: layer2 and VLAN !!! */
- if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2)
- pkt_len += ETH_HLEN;
- if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q))
- pkt_len += VLAN_HLEN;
- /* does complete packet fit in current page ? */
- page_remainder = PAGE_SIZE - page_offset;
- if (page_remainder < (sizeof(struct qeth_hdr) + pkt_len)) {
- /* no -> go to start of next page */
- ctx->offset += page_remainder;
- page = ctx->pages[ctx->offset >> PAGE_SHIFT];
- page_offset = 0;
- }
- memcpy(page + page_offset, &eddp->qh, sizeof(struct qeth_hdr));
- element->addr = page + page_offset;
- element->length = sizeof(struct qeth_hdr);
- ctx->offset += sizeof(struct qeth_hdr);
- page_offset += sizeof(struct qeth_hdr);
- /* add mac header (?) */
- if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
- memcpy(page + page_offset, &eddp->mac, ETH_HLEN);
- element->length += ETH_HLEN;
- ctx->offset += ETH_HLEN;
- page_offset += ETH_HLEN;
- }
- /* add VLAN tag */
- if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) {
- memcpy(page + page_offset, &eddp->vlan, VLAN_HLEN);
- element->length += VLAN_HLEN;
- ctx->offset += VLAN_HLEN;
- page_offset += VLAN_HLEN;
- }
- /* add network header */
- memcpy(page + page_offset, (u8 *)&eddp->nh, eddp->nhl);
- element->length += eddp->nhl;
- eddp->nh_in_ctx = page + page_offset;
- ctx->offset += eddp->nhl;
- page_offset += eddp->nhl;
- /* add transport header */
- memcpy(page + page_offset, (u8 *)&eddp->th, eddp->thl);
- element->length += eddp->thl;
- eddp->th_in_ctx = page + page_offset;
- ctx->offset += eddp->thl;
-}
-
-static void qeth_eddp_copy_data_tcp(char *dst, struct qeth_eddp_data *eddp,
- int len, __wsum *hcsum)
-{
- struct skb_frag_struct *frag;
- int left_in_frag;
- int copy_len;
- u8 *src;
-
- QETH_DBF_TEXT(TRACE, 5, "eddpcdtc");
- if (skb_shinfo(eddp->skb)->nr_frags == 0) {
- skb_copy_from_linear_data_offset(eddp->skb, eddp->skb_offset,
- dst, len);
- *hcsum = csum_partial(eddp->skb->data + eddp->skb_offset, len,
- *hcsum);
- eddp->skb_offset += len;
- } else {
- while (len > 0) {
- if (eddp->frag < 0) {
- /* we're in skb->data */
- left_in_frag = (eddp->skb->len -
- eddp->skb->data_len)
- - eddp->skb_offset;
- src = eddp->skb->data + eddp->skb_offset;
- } else {
- frag = &skb_shinfo(eddp->skb)->frags[
- eddp->frag];
- left_in_frag = frag->size - eddp->frag_offset;
- src = (u8 *)((page_to_pfn(frag->page) <<
- PAGE_SHIFT) + frag->page_offset +
- eddp->frag_offset);
- }
- if (left_in_frag <= 0) {
- eddp->frag++;
- eddp->frag_offset = 0;
- continue;
- }
- copy_len = min(left_in_frag, len);
- memcpy(dst, src, copy_len);
- *hcsum = csum_partial(src, copy_len, *hcsum);
- dst += copy_len;
- eddp->frag_offset += copy_len;
- eddp->skb_offset += copy_len;
- len -= copy_len;
- }
- }
-}
-
-static void qeth_eddp_create_segment_data_tcp(struct qeth_eddp_context *ctx,
- struct qeth_eddp_data *eddp, int data_len, __wsum hcsum)
-{
- u8 *page;
- int page_remainder;
- int page_offset;
- struct qeth_eddp_element *element;
- int first_lap = 1;
-
- QETH_DBF_TEXT(TRACE, 5, "eddpcsdt");
- page = ctx->pages[ctx->offset >> PAGE_SHIFT];
- page_offset = ctx->offset % PAGE_SIZE;
- element = &ctx->elements[ctx->num_elements];
- while (data_len) {
- page_remainder = PAGE_SIZE - page_offset;
- if (page_remainder < data_len) {
- qeth_eddp_copy_data_tcp(page + page_offset, eddp,
- page_remainder, &hcsum);
- element->length += page_remainder;
- if (first_lap)
- element->flags = SBAL_FLAGS_FIRST_FRAG;
- else
- element->flags = SBAL_FLAGS_MIDDLE_FRAG;
- ctx->num_elements++;
- element++;
- data_len -= page_remainder;
- ctx->offset += page_remainder;
- page = ctx->pages[ctx->offset >> PAGE_SHIFT];
- page_offset = 0;
- element->addr = page + page_offset;
- } else {
- qeth_eddp_copy_data_tcp(page + page_offset, eddp,
- data_len, &hcsum);
- element->length += data_len;
- if (!first_lap)
- element->flags = SBAL_FLAGS_LAST_FRAG;
- ctx->num_elements++;
- ctx->offset += data_len;
- data_len = 0;
- }
- first_lap = 0;
- }
- ((struct tcphdr *)eddp->th_in_ctx)->check = csum_fold(hcsum);
-}
-
-static __wsum qeth_eddp_check_tcp4_hdr(struct qeth_eddp_data *eddp,
- int data_len)
-{
- __wsum phcsum; /* pseudo header checksum */
-
- QETH_DBF_TEXT(TRACE, 5, "eddpckt4");
- eddp->th.tcp.h.check = 0;
- /* compute pseudo header checksum */
- phcsum = csum_tcpudp_nofold(eddp->nh.ip4.h.saddr, eddp->nh.ip4.h.daddr,
- eddp->thl + data_len, IPPROTO_TCP, 0);
- /* compute checksum of tcp header */
- return csum_partial(&eddp->th, eddp->thl, phcsum);
-}
-
-static __wsum qeth_eddp_check_tcp6_hdr(struct qeth_eddp_data *eddp,
- int data_len)
-{
- __be32 proto;
- __wsum phcsum; /* pseudo header checksum */
-
- QETH_DBF_TEXT(TRACE, 5, "eddpckt6");
- eddp->th.tcp.h.check = 0;
- /* compute pseudo header checksum */
- phcsum = csum_partial(&eddp->nh.ip6.h.saddr,
- sizeof(struct in6_addr), 0);
- phcsum = csum_partial(&eddp->nh.ip6.h.daddr,
- sizeof(struct in6_addr), phcsum);
- proto = htonl(IPPROTO_TCP);
- phcsum = csum_partial(&proto, sizeof(u32), phcsum);
- return phcsum;
-}
-
-static struct qeth_eddp_data *qeth_eddp_create_eddp_data(struct qeth_hdr *qh,
- u8 *nh, u8 nhl, u8 *th, u8 thl)
-{
- struct qeth_eddp_data *eddp;
-
- QETH_DBF_TEXT(TRACE, 5, "eddpcrda");
- eddp = kzalloc(sizeof(struct qeth_eddp_data), GFP_ATOMIC);
- if (eddp) {
- eddp->nhl = nhl;
- eddp->thl = thl;
- memcpy(&eddp->qh, qh, sizeof(struct qeth_hdr));
- memcpy(&eddp->nh, nh, nhl);
- memcpy(&eddp->th, th, thl);
- eddp->frag = -1; /* initially we're in skb->data */
- }
- return eddp;
-}
-
-static void __qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx,
- struct qeth_eddp_data *eddp)
-{
- struct tcphdr *tcph;
- int data_len;
- __wsum hcsum;
-
- QETH_DBF_TEXT(TRACE, 5, "eddpftcp");
- eddp->skb_offset = sizeof(struct qeth_hdr) + eddp->nhl + eddp->thl;
- if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
- eddp->skb_offset += sizeof(struct ethhdr);
- if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q))
- eddp->skb_offset += VLAN_HLEN;
- }
- tcph = tcp_hdr(eddp->skb);
- while (eddp->skb_offset < eddp->skb->len) {
- data_len = min((int)skb_shinfo(eddp->skb)->gso_size,
- (int)(eddp->skb->len - eddp->skb_offset));
- /* prepare qdio hdr */
- if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
- eddp->qh.hdr.l2.pkt_length = data_len + ETH_HLEN +
- eddp->nhl + eddp->thl;
- if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q))
- eddp->qh.hdr.l2.pkt_length += VLAN_HLEN;
- } else
- eddp->qh.hdr.l3.length = data_len + eddp->nhl +
- eddp->thl;
- /* prepare ip hdr */
- if (eddp->skb->protocol == htons(ETH_P_IP)) {
- eddp->nh.ip4.h.tot_len = htons(data_len + eddp->nhl +
- eddp->thl);
- eddp->nh.ip4.h.check = 0;
- eddp->nh.ip4.h.check =
- ip_fast_csum((u8 *)&eddp->nh.ip4.h,
- eddp->nh.ip4.h.ihl);
- } else
- eddp->nh.ip6.h.payload_len = htons(data_len +
- eddp->thl);
- /* prepare tcp hdr */
- if (data_len == (eddp->skb->len - eddp->skb_offset)) {
- /* last segment -> set FIN and PSH flags */
- eddp->th.tcp.h.fin = tcph->fin;
- eddp->th.tcp.h.psh = tcph->psh;
- }
- if (eddp->skb->protocol == htons(ETH_P_IP))
- hcsum = qeth_eddp_check_tcp4_hdr(eddp, data_len);
- else
- hcsum = qeth_eddp_check_tcp6_hdr(eddp, data_len);
- /* fill the next segment into the context */
- qeth_eddp_create_segment_hdrs(ctx, eddp, data_len);
- qeth_eddp_create_segment_data_tcp(ctx, eddp, data_len, hcsum);
- if (eddp->skb_offset >= eddp->skb->len)
- break;
- /* prepare headers for next round */
- if (eddp->skb->protocol == htons(ETH_P_IP))
- eddp->nh.ip4.h.id = htons(ntohs(eddp->nh.ip4.h.id) + 1);
- eddp->th.tcp.h.seq = htonl(ntohl(eddp->th.tcp.h.seq) +
- data_len);
- }
-}
-
-static int qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx,
- struct sk_buff *skb, struct qeth_hdr *qhdr)
-{
- struct qeth_eddp_data *eddp = NULL;
-
- QETH_DBF_TEXT(TRACE, 5, "eddpficx");
- /* create our segmentation headers and copy original headers */
- if (skb->protocol == htons(ETH_P_IP))
- eddp = qeth_eddp_create_eddp_data(qhdr,
- skb_network_header(skb),
- ip_hdrlen(skb),
- skb_transport_header(skb),
- tcp_hdrlen(skb));
- else
- eddp = qeth_eddp_create_eddp_data(qhdr,
- skb_network_header(skb),
- sizeof(struct ipv6hdr),
- skb_transport_header(skb),
- tcp_hdrlen(skb));
-
- if (eddp == NULL) {
- QETH_DBF_TEXT(TRACE, 2, "eddpfcnm");
- return -ENOMEM;
- }
- if (qhdr->hdr.l2.id == QETH_HEADER_TYPE_LAYER2) {
- skb_set_mac_header(skb, sizeof(struct qeth_hdr));
- memcpy(&eddp->mac, eth_hdr(skb), ETH_HLEN);
- if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) {
- eddp->vlan[0] = skb->protocol;
- eddp->vlan[1] = htons(vlan_tx_tag_get(skb));
- }
- }
- /* the next flags will only be set on the last segment */
- eddp->th.tcp.h.fin = 0;
- eddp->th.tcp.h.psh = 0;
- eddp->skb = skb;
- /* begin segmentation and fill context */
- __qeth_eddp_fill_context_tcp(ctx, eddp);
- kfree(eddp);
- return 0;
-}
-
-static void qeth_eddp_calc_num_pages(struct qeth_eddp_context *ctx,
- struct sk_buff *skb, int hdr_len)
-{
- int skbs_per_page;
-
- QETH_DBF_TEXT(TRACE, 5, "eddpcanp");
- /* can we put multiple skbs in one page? */
- skbs_per_page = PAGE_SIZE / (skb_shinfo(skb)->gso_size + hdr_len);
- if (skbs_per_page > 1) {
- ctx->num_pages = (skb_shinfo(skb)->gso_segs + 1) /
- skbs_per_page + 1;
- ctx->elements_per_skb = 1;
- } else {
- /* no -> how many elements per skb? */
- ctx->elements_per_skb = (skb_shinfo(skb)->gso_size + hdr_len +
- PAGE_SIZE) >> PAGE_SHIFT;
- ctx->num_pages = ctx->elements_per_skb *
- (skb_shinfo(skb)->gso_segs + 1);
- }
- ctx->num_elements = ctx->elements_per_skb *
- (skb_shinfo(skb)->gso_segs + 1);
-}
-
-static struct qeth_eddp_context *qeth_eddp_create_context_generic(
- struct qeth_card *card, struct sk_buff *skb, int hdr_len)
-{
- struct qeth_eddp_context *ctx = NULL;
- u8 *addr;
- int i;
-
- QETH_DBF_TEXT(TRACE, 5, "creddpcg");
- /* create the context and allocate pages */
- ctx = kzalloc(sizeof(struct qeth_eddp_context), GFP_ATOMIC);
- if (ctx == NULL) {
- QETH_DBF_TEXT(TRACE, 2, "ceddpcn1");
- return NULL;
- }
- ctx->type = QETH_LARGE_SEND_EDDP;
- qeth_eddp_calc_num_pages(ctx, skb, hdr_len);
- if (ctx->elements_per_skb > QETH_MAX_BUFFER_ELEMENTS(card)) {
- QETH_DBF_TEXT(TRACE, 2, "ceddpcis");
- kfree(ctx);
- return NULL;
- }
- ctx->pages = kcalloc(ctx->num_pages, sizeof(u8 *), GFP_ATOMIC);
- if (ctx->pages == NULL) {
- QETH_DBF_TEXT(TRACE, 2, "ceddpcn2");
- kfree(ctx);
- return NULL;
- }
- for (i = 0; i < ctx->num_pages; ++i) {
- addr = (u8 *)get_zeroed_page(GFP_ATOMIC);
- if (addr == NULL) {
- QETH_DBF_TEXT(TRACE, 2, "ceddpcn3");
- ctx->num_pages = i;
- qeth_eddp_free_context(ctx);
- return NULL;
- }
- ctx->pages[i] = addr;
- }
- ctx->elements = kcalloc(ctx->num_elements,
- sizeof(struct qeth_eddp_element), GFP_ATOMIC);
- if (ctx->elements == NULL) {
- QETH_DBF_TEXT(TRACE, 2, "ceddpcn4");
- qeth_eddp_free_context(ctx);
- return NULL;
- }
- /* reset num_elements; will be incremented again in fill_buffer to
- * reflect number of actually used elements */
- ctx->num_elements = 0;
- return ctx;
-}
-
-static struct qeth_eddp_context *qeth_eddp_create_context_tcp(
- struct qeth_card *card, struct sk_buff *skb,
- struct qeth_hdr *qhdr)
-{
- struct qeth_eddp_context *ctx = NULL;
-
- QETH_DBF_TEXT(TRACE, 5, "creddpct");
- if (skb->protocol == htons(ETH_P_IP))
- ctx = qeth_eddp_create_context_generic(card, skb,
- (sizeof(struct qeth_hdr) +
- ip_hdrlen(skb) +
- tcp_hdrlen(skb)));
- else if (skb->protocol == htons(ETH_P_IPV6))
- ctx = qeth_eddp_create_context_generic(card, skb,
- sizeof(struct qeth_hdr) + sizeof(struct ipv6hdr) +
- tcp_hdrlen(skb));
- else
- QETH_DBF_TEXT(TRACE, 2, "cetcpinv");
-
- if (ctx == NULL) {
- QETH_DBF_TEXT(TRACE, 2, "creddpnl");
- return NULL;
- }
- if (qeth_eddp_fill_context_tcp(ctx, skb, qhdr)) {
- QETH_DBF_TEXT(TRACE, 2, "ceddptfe");
- qeth_eddp_free_context(ctx);
- return NULL;
- }
- atomic_set(&ctx->refcnt, 1);
- return ctx;
-}
-
-struct qeth_eddp_context *qeth_eddp_create_context(struct qeth_card *card,
- struct sk_buff *skb, struct qeth_hdr *qhdr,
- unsigned char sk_protocol)
-{
- QETH_DBF_TEXT(TRACE, 5, "creddpc");
- switch (sk_protocol) {
- case IPPROTO_TCP:
- return qeth_eddp_create_context_tcp(card, skb, qhdr);
- default:
- QETH_DBF_TEXT(TRACE, 2, "eddpinvp");
- }
- return NULL;
-}
-EXPORT_SYMBOL_GPL(qeth_eddp_create_context);
-
-void qeth_tso_fill_header(struct qeth_card *card, struct qeth_hdr *qhdr,
- struct sk_buff *skb)
-{
- struct qeth_hdr_tso *hdr = (struct qeth_hdr_tso *)qhdr;
- struct tcphdr *tcph = tcp_hdr(skb);
- struct iphdr *iph = ip_hdr(skb);
- struct ipv6hdr *ip6h = ipv6_hdr(skb);
-
- QETH_DBF_TEXT(TRACE, 5, "tsofhdr");
-
- /*fix header to TSO values ...*/
- hdr->hdr.hdr.l3.id = QETH_HEADER_TYPE_TSO;
- /*set values which are fix for the first approach ...*/
- hdr->ext.hdr_tot_len = (__u16) sizeof(struct qeth_hdr_ext_tso);
- hdr->ext.imb_hdr_no = 1;
- hdr->ext.hdr_type = 1;
- hdr->ext.hdr_version = 1;
- hdr->ext.hdr_len = 28;
- /*insert non-fix values */
- hdr->ext.mss = skb_shinfo(skb)->gso_size;
- hdr->ext.dg_hdr_len = (__u16)(iph->ihl*4 + tcph->doff*4);
- hdr->ext.payload_len = (__u16)(skb->len - hdr->ext.dg_hdr_len -
- sizeof(struct qeth_hdr_tso));
- tcph->check = 0;
- if (skb->protocol == ETH_P_IPV6) {
- ip6h->payload_len = 0;
- tcph->check = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
- 0, IPPROTO_TCP, 0);
- } else {
- /*OSA want us to set these values ...*/
- tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
- 0, IPPROTO_TCP, 0);
- iph->tot_len = 0;
- iph->check = 0;
- }
-}
-EXPORT_SYMBOL_GPL(qeth_tso_fill_header);
-
-void qeth_tx_csum(struct sk_buff *skb)
-{
- int tlen;
- if (skb->protocol == htons(ETH_P_IP)) {
- tlen = ntohs(ip_hdr(skb)->tot_len) - (ip_hdr(skb)->ihl << 2);
- switch (ip_hdr(skb)->protocol) {
- case IPPROTO_TCP:
- tcp_hdr(skb)->check = 0;
- tcp_hdr(skb)->check = csum_tcpudp_magic(
- ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
- tlen, ip_hdr(skb)->protocol,
- skb_checksum(skb, skb_transport_offset(skb),
- tlen, 0));
- break;
- case IPPROTO_UDP:
- udp_hdr(skb)->check = 0;
- udp_hdr(skb)->check = csum_tcpudp_magic(
- ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
- tlen, ip_hdr(skb)->protocol,
- skb_checksum(skb, skb_transport_offset(skb),
- tlen, 0));
- break;
- }
- } else if (skb->protocol == htons(ETH_P_IPV6)) {
- switch (ipv6_hdr(skb)->nexthdr) {
- case IPPROTO_TCP:
- tcp_hdr(skb)->check = 0;
- tcp_hdr(skb)->check = csum_ipv6_magic(
- &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
- ipv6_hdr(skb)->payload_len,
- ipv6_hdr(skb)->nexthdr,
- skb_checksum(skb, skb_transport_offset(skb),
- ipv6_hdr(skb)->payload_len, 0));
- break;
- case IPPROTO_UDP:
- udp_hdr(skb)->check = 0;
- udp_hdr(skb)->check = csum_ipv6_magic(
- &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
- ipv6_hdr(skb)->payload_len,
- ipv6_hdr(skb)->nexthdr,
- skb_checksum(skb, skb_transport_offset(skb),
- ipv6_hdr(skb)->payload_len, 0));
- break;
- }
- }
-}
-EXPORT_SYMBOL_GPL(qeth_tx_csum);
projects / linux-block.git / blobdiff