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path: root/drivers/s390/net/qeth_tso.c
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Diffstat (limited to 'drivers/s390/net/qeth_tso.c')
-rw-r--r--drivers/s390/net/qeth_tso.c285
1 files changed, 0 insertions, 285 deletions
diff --git a/drivers/s390/net/qeth_tso.c b/drivers/s390/net/qeth_tso.c
deleted file mode 100644
index c91976274e7..00000000000
--- a/drivers/s390/net/qeth_tso.c
+++ /dev/null
@@ -1,285 +0,0 @@
-/*
- * linux/drivers/s390/net/qeth_tso.c ($Revision: 1.6 $)
- *
- * Header file for qeth TCP Segmentation Offload support.
- *
- * Copyright 2004 IBM Corporation
- *
- * Author(s): Frank Pavlic <pavlic@de.ibm.com>
- *
- * $Revision: 1.6 $ $Date: 2005/03/24 09:04:18 $
- *
- */
-
-#include <linux/skbuff.h>
-#include <linux/tcp.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <net/ip6_checksum.h>
-#include "qeth.h"
-#include "qeth_mpc.h"
-#include "qeth_tso.h"
-
-/**
- * skb already partially prepared
- * classic qdio header in skb->data
- * */
-static inline struct qeth_hdr_tso *
-qeth_tso_prepare_skb(struct qeth_card *card, struct sk_buff **skb)
-{
- int rc = 0;
-
- QETH_DBF_TEXT(trace, 5, "tsoprsk");
- rc = qeth_realloc_headroom(card, skb,sizeof(struct qeth_hdr_ext_tso));
- if (rc)
- return NULL;
-
- return qeth_push_skb(card, skb, sizeof(struct qeth_hdr_ext_tso));
-}
-
-/**
- * fill header for a TSO packet
- */
-static inline void
-qeth_tso_fill_header(struct qeth_card *card, struct sk_buff *skb)
-{
- struct qeth_hdr_tso *hdr;
- struct tcphdr *tcph;
- struct iphdr *iph;
-
- QETH_DBF_TEXT(trace, 5, "tsofhdr");
-
- hdr = (struct qeth_hdr_tso *) skb->data;
- iph = skb->nh.iph;
- tcph = skb->h.th;
- /*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)->tso_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));
-}
-
-/**
- * change some header values as requested by hardware
- */
-static inline void
-qeth_tso_set_tcpip_header(struct qeth_card *card, struct sk_buff *skb)
-{
- struct iphdr *iph;
- struct ipv6hdr *ip6h;
- struct tcphdr *tcph;
-
- iph = skb->nh.iph;
- ip6h = skb->nh.ipv6h;
- tcph = skb->h.th;
-
- 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);
- return;
- }
- /*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;
-}
-
-static inline struct qeth_hdr_tso *
-qeth_tso_prepare_packet(struct qeth_card *card, struct sk_buff *skb,
- int ipv, int cast_type)
-{
- struct qeth_hdr_tso *hdr;
- int rc = 0;
-
- QETH_DBF_TEXT(trace, 5, "tsoprep");
-
- /*get headroom for tso qdio header */
- hdr = (struct qeth_hdr_tso *) qeth_tso_prepare_skb(card, &skb);
- if (hdr == NULL) {
- QETH_DBF_TEXT_(trace, 4, "2err%d", rc);
- return NULL;
- }
- memset(hdr, 0, sizeof(struct qeth_hdr_tso));
- /*fill first 32 bytes of qdio header as used
- *FIXME: TSO has two struct members
- * with different names but same size
- * */
- qeth_fill_header(card, &hdr->hdr, skb, ipv, cast_type);
- qeth_tso_fill_header(card, skb);
- qeth_tso_set_tcpip_header(card, skb);
- return hdr;
-}
-
-static inline int
-qeth_tso_get_queue_buffer(struct qeth_qdio_out_q *queue)
-{
- struct qeth_qdio_out_buffer *buffer;
- int flush_cnt = 0;
-
- QETH_DBF_TEXT(trace, 5, "tsobuf");
-
- /* force to non-packing*/
- if (queue->do_pack)
- queue->do_pack = 0;
- buffer = &queue->bufs[queue->next_buf_to_fill];
- /* get a new buffer if current is already in use*/
- if ((atomic_read(&buffer->state) == QETH_QDIO_BUF_EMPTY) &&
- (buffer->next_element_to_fill > 0)) {
- atomic_set(&buffer->state, QETH_QDIO_BUF_PRIMED);
- queue->next_buf_to_fill = (queue->next_buf_to_fill + 1) %
- QDIO_MAX_BUFFERS_PER_Q;
- flush_cnt++;
- }
- return flush_cnt;
-}
-
-static inline void
-__qeth_tso_fill_buffer_frag(struct qeth_qdio_out_buffer *buf,
- struct sk_buff *skb)
-{
- struct skb_frag_struct *frag;
- struct qdio_buffer *buffer;
- int fragno, cnt, element;
- unsigned long addr;
-
- QETH_DBF_TEXT(trace, 6, "tsfilfrg");
-
- /*initialize variables ...*/
- fragno = skb_shinfo(skb)->nr_frags;
- buffer = buf->buffer;
- element = buf->next_element_to_fill;
- /*fill buffer elements .....*/
- for (cnt = 0; cnt < fragno; cnt++) {
- frag = &skb_shinfo(skb)->frags[cnt];
- addr = (page_to_pfn(frag->page) << PAGE_SHIFT) +
- frag->page_offset;
- buffer->element[element].addr = (char *)addr;
- buffer->element[element].length = frag->size;
- if (cnt < (fragno - 1))
- buffer->element[element].flags =
- SBAL_FLAGS_MIDDLE_FRAG;
- else
- buffer->element[element].flags =
- SBAL_FLAGS_LAST_FRAG;
- element++;
- }
- buf->next_element_to_fill = element;
-}
-
-static inline int
-qeth_tso_fill_buffer(struct qeth_qdio_out_buffer *buf,
- struct sk_buff *skb)
-{
- int length, length_here, element;
- int hdr_len;
- struct qdio_buffer *buffer;
- struct qeth_hdr_tso *hdr;
- char *data;
-
- QETH_DBF_TEXT(trace, 3, "tsfilbuf");
-
- /*increment user count and queue skb ...*/
- atomic_inc(&skb->users);
- skb_queue_tail(&buf->skb_list, skb);
-
- /*initialize all variables...*/
- buffer = buf->buffer;
- hdr = (struct qeth_hdr_tso *)skb->data;
- hdr_len = sizeof(struct qeth_hdr_tso) + hdr->ext.dg_hdr_len;
- data = skb->data + hdr_len;
- length = skb->len - hdr_len;
- element = buf->next_element_to_fill;
- /*fill first buffer entry only with header information */
- buffer->element[element].addr = skb->data;
- buffer->element[element].length = hdr_len;
- buffer->element[element].flags = SBAL_FLAGS_FIRST_FRAG;
- buf->next_element_to_fill++;
-
- if (skb_shinfo(skb)->nr_frags > 0) {
- __qeth_tso_fill_buffer_frag(buf, skb);
- goto out;
- }
-
- /*start filling buffer entries ...*/
- element++;
- while (length > 0) {
- /* length_here is the remaining amount of data in this page */
- length_here = PAGE_SIZE - ((unsigned long) data % PAGE_SIZE);
- if (length < length_here)
- length_here = length;
- buffer->element[element].addr = data;
- buffer->element[element].length = length_here;
- length -= length_here;
- if (!length)
- buffer->element[element].flags =
- SBAL_FLAGS_LAST_FRAG;
- else
- buffer->element[element].flags =
- SBAL_FLAGS_MIDDLE_FRAG;
- data += length_here;
- element++;
- }
- /*set the buffer to primed ...*/
- buf->next_element_to_fill = element;
-out:
- atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED);
- return 1;
-}
-
-int
-qeth_tso_send_packet(struct qeth_card *card, struct sk_buff *skb,
- struct qeth_qdio_out_q *queue, int ipv, int cast_type)
-{
- int flush_cnt = 0;
- struct qeth_hdr_tso *hdr;
- struct qeth_qdio_out_buffer *buffer;
- int start_index;
-
- QETH_DBF_TEXT(trace, 3, "tsosend");
-
- if (!(hdr = qeth_tso_prepare_packet(card, skb, ipv, cast_type)))
- return -ENOMEM;
- /*check if skb fits in one SBAL ...*/
- if (!(qeth_get_elements_no(card, (void*)hdr, skb)))
- return -EINVAL;
- /*lock queue, force switching to non-packing and send it ...*/
- while (atomic_compare_and_swap(QETH_OUT_Q_UNLOCKED,
- QETH_OUT_Q_LOCKED,
- &queue->state));
- start_index = queue->next_buf_to_fill;
- buffer = &queue->bufs[queue->next_buf_to_fill];
- /*check if card is too busy ...*/
- if (atomic_read(&buffer->state) != QETH_QDIO_BUF_EMPTY){
- card->stats.tx_dropped++;
- goto out;
- }
- /*let's force to non-packing and get a new SBAL*/
- flush_cnt += qeth_tso_get_queue_buffer(queue);
- buffer = &queue->bufs[queue->next_buf_to_fill];
- if (atomic_read(&buffer->state) != QETH_QDIO_BUF_EMPTY) {
- card->stats.tx_dropped++;
- goto out;
- }
- flush_cnt += qeth_tso_fill_buffer(buffer, skb);
- queue->next_buf_to_fill = (queue->next_buf_to_fill + 1) %
- QDIO_MAX_BUFFERS_PER_Q;
-out:
- atomic_set(&queue->state, QETH_OUT_Q_UNLOCKED);
- if (flush_cnt)
- qeth_flush_buffers(queue, 0, start_index, flush_cnt);
- /*do some statistics */
- card->stats.tx_packets++;
- card->stats.tx_bytes += skb->len;
- return 0;
-}
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