diff options
Diffstat (limited to 'drivers/s390/net/qeth_core_offl.c')
| -rw-r--r-- | drivers/s390/net/qeth_core_offl.c | 701 |
1 files changed, 701 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_core_offl.c b/drivers/s390/net/qeth_core_offl.c new file mode 100644 index 000000000000..822df8362856 --- /dev/null +++ b/drivers/s390/net/qeth_core_offl.c @@ -0,0 +1,701 @@ +/* + * 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 { + PRINT_WARN("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)) { + PRINT_WARN("no memory to create eddp context " + "reference\n"); + 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((u8 *)&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((u8 *)&eddp->nh.ip6.h.saddr, + sizeof(struct in6_addr), 0); + phcsum = csum_partial((u8 *)&eddp->nh.ip6.h.daddr, + sizeof(struct in6_addr), phcsum); + proto = htonl(IPPROTO_TCP); + phcsum = csum_partial((u8 *)&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); |