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linux/drivers/s390/net/qeth_core_offl.c

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/*
* 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);
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