/*
- * linux/drivers/s390/net/qeth_tso.h ($Revision: 1.5 $)
+ * linux/drivers/s390/net/qeth_tso.h ($Revision: 1.7 $)
*
* Header file for qeth TCP Segmentation Offload support.
*
*
* Author(s): Frank Pavlic <pavlic@de.ibm.com>
*
- * $Revision: 1.5 $ $Date: 2005/04/01 21:40:41 $
+ * $Revision: 1.7 $ $Date: 2005/05/04 20:19:18 $
*
*/
#ifndef __QETH_TSO_H__
#define __QETH_TSO_H__
+#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"
-extern int
-qeth_tso_send_packet(struct qeth_card *, struct sk_buff *,
- struct qeth_qdio_out_q *, int , int);
-struct qeth_hdr_ext_tso {
- __u16 hdr_tot_len;
- __u8 imb_hdr_no;
- __u8 reserved;
- __u8 hdr_type;
- __u8 hdr_version;
- __u16 hdr_len;
- __u32 payload_len;
- __u16 mss;
- __u16 dg_hdr_len;
- __u8 padding[16];
-} __attribute__ ((packed));
+static inline struct qeth_hdr_tso *
+qeth_tso_prepare_skb(struct qeth_card *card, struct sk_buff **skb)
+{
+ QETH_DBF_TEXT(trace, 5, "tsoprsk");
+ return qeth_push_skb(card, skb, sizeof(struct qeth_hdr_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;
-struct qeth_hdr_tso {
- struct qeth_hdr hdr; /*hdr->hdr.l3.xxx*/
- struct qeth_hdr_ext_tso ext;
-} __attribute__ ((packed));
+ 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;
+}
-/*some helper functions*/
static inline int
-qeth_get_elements_no(struct qeth_card *card, void *hdr, struct sk_buff *skb)
+qeth_tso_prepare_packet(struct qeth_card *card, struct sk_buff *skb,
+ int ipv, int cast_type)
{
- int elements_needed = 0;
+ struct qeth_hdr_tso *hdr;
- if (skb_shinfo(skb)->nr_frags > 0)
- elements_needed = (skb_shinfo(skb)->nr_frags + 1);
- if (elements_needed == 0 )
- elements_needed = 1 + (((((unsigned long) hdr) % PAGE_SIZE)
- + skb->len) >> PAGE_SHIFT);
- if (elements_needed > QETH_MAX_BUFFER_ELEMENTS(card)){
- PRINT_ERR("qeth_do_send_packet: invalid size of "
- "IP packet. Discarded.");
- return 0;
- }
- return elements_needed;
+ QETH_DBF_TEXT(trace, 5, "tsoprep");
+
+ hdr = (struct qeth_hdr_tso *) qeth_tso_prepare_skb(card, &skb);
+ if (hdr == NULL) {
+ QETH_DBF_TEXT(trace, 4, "tsoperr");
+ return -ENOMEM;
+ }
+ 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 0;
}
static inline void
__qeth_fill_buffer_frag(struct sk_buff *skb, struct qdio_buffer *buffer,
int is_tso, int *next_element_to_fill)
{
- int length = skb->len;
struct skb_frag_struct *frag;
int fragno;
unsigned long addr;
- int element;
- int first_lap = 1;
-
- fragno = skb_shinfo(skb)->nr_frags; /* start with last frag */
- element = *next_element_to_fill + fragno;
- while (length > 0) {
- if (fragno > 0) {
- frag = &skb_shinfo(skb)->frags[fragno - 1];
- addr = (page_to_pfn(frag->page) << PAGE_SHIFT) +
- frag->page_offset;
- buffer->element[element].addr = (char *)addr;
- buffer->element[element].length = frag->size;
- length -= frag->size;
- if (first_lap)
- buffer->element[element].flags =
- SBAL_FLAGS_LAST_FRAG;
- else
- buffer->element[element].flags =
- SBAL_FLAGS_MIDDLE_FRAG;
- } else {
- buffer->element[element].addr = skb->data;
- buffer->element[element].length = length;
- length = 0;
- if (is_tso)
- buffer->element[element].flags =
- SBAL_FLAGS_MIDDLE_FRAG;
- else
- buffer->element[element].flags =
- SBAL_FLAGS_FIRST_FRAG;
- }
- element--;
- fragno--;
- first_lap = 0;
+ int element, cnt, dlen;
+
+ fragno = skb_shinfo(skb)->nr_frags;
+ element = *next_element_to_fill;
+ dlen = 0;
+
+ if (is_tso)
+ buffer->element[element].flags =
+ SBAL_FLAGS_MIDDLE_FRAG;
+ else
+ buffer->element[element].flags =
+ SBAL_FLAGS_FIRST_FRAG;
+ if ( (dlen = (skb->len - skb->data_len)) ) {
+ buffer->element[element].addr = skb->data;
+ buffer->element[element].length = dlen;
+ element++;
}
- *next_element_to_fill += skb_shinfo(skb)->nr_frags + 1;
+ 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++;
+ }
+ *next_element_to_fill = element;
}
-
#endif /* __QETH_TSO_H__ */
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