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drivers
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s390
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net
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qeth_tso.h

qeth_tso.h 1.4 KB
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  1. /*
    2. 

  2.  * linux/drivers/s390/net/qeth_tso.h ($Revision: 1.4 $)
    3. 

  3.  *
    4. 

  4.  * Header file for qeth TCP Segmentation Offload support.
    5. 

  5.  *
    6. 

  6.  * Copyright 2004 IBM Corporation
    7. 

  7.  *
    8. 

  8.  *    Author(s): Frank Pavlic <pavlic@de.ibm.com>
    9. 

  9.  *
    10. 

  10.  *    $Revision: 1.4 $	 $Date: 2005/03/24 09:04:18 $
    11. 

  11.  *
    12. 

  12.  */
    13. 

  13. #ifndef __QETH_TSO_H__
    14. 

  14. #define __QETH_TSO_H__
    15. 

  15. 

  16. 

  17. extern int
    18. 

  18. qeth_tso_send_packet(struct qeth_card *, struct sk_buff *,
    19. 

  19. 		     struct qeth_qdio_out_q *, int , int);
    20. 

  20. 

  21. struct qeth_hdr_ext_tso {
    22. 

  22.         __u16 hdr_tot_len;
    23. 

  23.         __u8  imb_hdr_no;
    24. 

  24.         __u8  reserved;
    25. 

  25.         __u8  hdr_type;
    26. 

  26.         __u8  hdr_version;
    27. 

  27.         __u16 hdr_len;
    28. 

  28.         __u32 payload_len;
    29. 

  29.         __u16 mss;
    30. 

  30.         __u16 dg_hdr_len;
    31. 

  31.         __u8  padding[16];
    32. 

  32. } __attribute__ ((packed));
    33. 

  33. 

  34. struct qeth_hdr_tso {
    35. 

  35.         struct qeth_hdr hdr; 	/*hdr->hdr.l3.xxx*/
    36. 

  36. 	struct qeth_hdr_ext_tso ext;
    37. 

  37. } __attribute__ ((packed));
    38. 

  38. 

  39. /*some helper functions*/
    40. 

  40. 

  41. static inline int
    42. 

  42. qeth_get_elements_no(struct qeth_card *card, void *hdr, struct sk_buff *skb)
    43. 

  43. {
    44. 

  44. 	int elements_needed = 0;
    45. 

  45. 

  46. 	if (skb_shinfo(skb)->nr_frags > 0)
    47. 

  47. 		elements_needed = (skb_shinfo(skb)->nr_frags + 1);
    48. 

  48. 	if (elements_needed == 0 )
    49. 

  49. 		elements_needed = 1 + (((((unsigned long) hdr) % PAGE_SIZE)
    50. 

  50. 					+ skb->len) >> PAGE_SHIFT);
    51. 

  51. 	if (elements_needed > QETH_MAX_BUFFER_ELEMENTS(card)){
    52. 

  52. 		PRINT_ERR("qeth_do_send_packet: invalid size of "
    53. 

  53. 			  "IP packet. Discarded.");
    54. 

  54. 		return 0;
    55. 

  55. 	}
    56. 

  56. 	return elements_needed;
    57. 

  57. }
    58. 

  58. #endif /* __QETH_TSO_H__ */
    59.