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/*
* linux/drivers/s390/net/qeth_tso.h ($Revision: 1.4 $)
*
* Header file for qeth TCP Segmentation Offload support.
*
* Copyright 2004 IBM Corporation
*
* Author(s): Frank Pavlic <pavlic@de.ibm.com>
*
* $Revision: 1.4 $ $Date: 2005/03/24 09:04:18 $
*
*/
#ifndef __QETH_TSO_H__
#define __QETH_TSO_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));
struct qeth_hdr_tso {
struct qeth_hdr hdr; /*hdr->hdr.l3.xxx*/
struct qeth_hdr_ext_tso ext;
} __attribute__ ((packed));
/*some helper functions*/
static inline int
qeth_get_elements_no(struct qeth_card *card, void *hdr, struct sk_buff *skb)
{
int elements_needed = 0;
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;
}
#endif /* __QETH_TSO_H__ */
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