drivers/s390/net/qeth_tso.h

   1 /*
   2  * linux/drivers/s390/net/qeth_tso.h ($Revision: 1.4 $)
   3  *
   4  * Header file for qeth TCP Segmentation Offload support.
   5  *
   6  * Copyright 2004 IBM Corporation
   7  *
   8  *    Author(s): Frank Pavlic <pavlic@de.ibm.com>
   9  *
  10  *    $Revision: 1.4 $   $Date: 2005/03/24 09:04:18 $
  11  *
  12  */
  13 #ifndef __QETH_TSO_H__
  14 #define __QETH_TSO_H__
  15
  16
  17 extern int
  18 qeth_tso_send_packet(struct qeth_card *, struct sk_buff *,
  19                      struct qeth_qdio_out_q *, int , int);
  20
  21 struct qeth_hdr_ext_tso {
  22         __u16 hdr_tot_len;
  23         __u8  imb_hdr_no;
  24         __u8  reserved;
  25         __u8  hdr_type;
  26         __u8  hdr_version;
  27         __u16 hdr_len;
  28         __u32 payload_len;
  29         __u16 mss;
  30         __u16 dg_hdr_len;
  31         __u8  padding[16];
  32 } __attribute__ ((packed));
  33
  34 struct qeth_hdr_tso {
  35         struct qeth_hdr hdr;    /*hdr->hdr.l3.xxx*/
  36         struct qeth_hdr_ext_tso ext;
  37 } __attribute__ ((packed));
  38
  39 /*some helper functions*/
  40
  41 static inline int
  42 qeth_get_elements_no(struct qeth_card *card, void *hdr, struct sk_buff *skb)
  43 {
  44         int elements_needed = 0;
  45
  46         if (skb_shinfo(skb)->nr_frags > 0)
  47                 elements_needed = (skb_shinfo(skb)->nr_frags + 1);
  48         if (elements_needed == 0 )
  49                 elements_needed = 1 + (((((unsigned long) hdr) % PAGE_SIZE)
  50                                         + skb->len) >> PAGE_SHIFT);
  51         if (elements_needed > QETH_MAX_BUFFER_ELEMENTS(card)){
  52                 PRINT_ERR("qeth_do_send_packet: invalid size of "
  53                           "IP packet. Discarded.");
  54                 return 0;
  55         }
  56         return elements_needed;
  57 }
  58 #endif /* __QETH_TSO_H__ */