| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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__ */ |