59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
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/*
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* linux/drivers/s390/net/qeth_tso.h ($Revision: 1.4 $)
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*
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* Header file for qeth TCP Segmentation Offload support.
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*
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* Copyright 2004 IBM Corporation
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*
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* Author(s): Frank Pavlic <pavlic@de.ibm.com>
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*
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* $Revision: 1.4 $ $Date: 2005/03/24 09:04:18 $
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*
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*/
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#ifndef __QETH_TSO_H__
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#define __QETH_TSO_H__
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extern int
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qeth_tso_send_packet(struct qeth_card *, struct sk_buff *,
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struct qeth_qdio_out_q *, int , int);
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struct qeth_hdr_ext_tso {
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__u16 hdr_tot_len;
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__u8 imb_hdr_no;
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__u8 reserved;
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__u8 hdr_type;
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__u8 hdr_version;
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__u16 hdr_len;
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__u32 payload_len;
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__u16 mss;
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__u16 dg_hdr_len;
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__u8 padding[16];
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} __attribute__ ((packed));
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struct qeth_hdr_tso {
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struct qeth_hdr hdr; /*hdr->hdr.l3.xxx*/
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struct qeth_hdr_ext_tso ext;
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} __attribute__ ((packed));
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/*some helper functions*/
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static inline int
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qeth_get_elements_no(struct qeth_card *card, void *hdr, struct sk_buff *skb)
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{
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int elements_needed = 0;
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if (skb_shinfo(skb)->nr_frags > 0)
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elements_needed = (skb_shinfo(skb)->nr_frags + 1);
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if (elements_needed == 0 )
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elements_needed = 1 + (((((unsigned long) hdr) % PAGE_SIZE)
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+ skb->len) >> PAGE_SHIFT);
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if (elements_needed > QETH_MAX_BUFFER_ELEMENTS(card)){
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PRINT_ERR("qeth_do_send_packet: invalid size of "
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"IP packet. Discarded.");
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return 0;
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}
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return elements_needed;
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}
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#endif /* __QETH_TSO_H__ */
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