diff options
Diffstat (limited to 'drivers/s390/net/qeth_tso.h')
| -rw-r--r-- | drivers/s390/net/qeth_tso.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_tso.h b/drivers/s390/net/qeth_tso.h new file mode 100644 index 000000000000..83504dee3f57 --- /dev/null +++ b/drivers/s390/net/qeth_tso.h @@ -0,0 +1,58 @@ +/* + * 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__ */ |