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/*
* linux/drivers/s390/net/qeth_tso.h ($Revision: 1.5 $)
*
* Header file for qeth TCP Segmentation Offload support.
*
* Copyright 2004 IBM Corporation
*
* Author(s): Frank Pavlic <pavlic@de.ibm.com>
*
* $Revision: 1.5 $ $Date: 2005/04/01 21:40:41 $
*
*/
#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;
}
static inline void
__qeth_fill_buffer_frag(struct sk_buff *skb, struct qdio_buffer *buffer,
int is_tso, int *next_element_to_fill)
{
int length = skb->len;
struct skb_frag_struct *frag;
int fragno;
unsigned long addr;
int element;
int first_lap = 1;
fragno = skb_shinfo(skb)->nr_frags; /* start with last frag */
element = *next_element_to_fill + fragno;
while (length > 0) {
if (fragno > 0) {
frag = &skb_shinfo(skb)->frags[fragno - 1];
addr = (page_to_pfn(frag->page) << PAGE_SHIFT) +
frag->page_offset;
buffer->element[element].addr = (char *)addr;
buffer->element[element].length = frag->size;
length -= frag->size;
if (first_lap)
buffer->element[element].flags =
SBAL_FLAGS_LAST_FRAG;
else
buffer->element[element].flags =
SBAL_FLAGS_MIDDLE_FRAG;
} else {
buffer->element[element].addr = skb->data;
buffer->element[element].length = length;
length = 0;
if (is_tso)
buffer->element[element].flags =
SBAL_FLAGS_MIDDLE_FRAG;
else
buffer->element[element].flags =
SBAL_FLAGS_FIRST_FRAG;
}
element--;
fragno--;
first_lap = 0;
}
*next_element_to_fill += skb_shinfo(skb)->nr_frags + 1;
}
#endif /* __QETH_TSO_H__ */
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