d801145d91
[patch 7/10] s390: qeth bug fixes. From: Frank Pavlic <pavlic@de.ibm.com> qeth network driver changes: - Removed redundant code, use the same qeth_fill_buffer_frag for TSO path either - Using skb->frags solely is not correct since skb->data still points to the beginning of the whole data, even when it is a small portion we have to fill the qdio buffer with it. Signed-off-by: Frank Pavlic <pavlic@de.ibm.com>
103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
/*
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* linux/drivers/s390/net/qeth_tso.h ($Revision: 1.5 $)
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*
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* Header file for qeth TCP Segmentation Offload support.
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*
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* Copyright 2004 IBM Corporation
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*
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* Author(s): Frank Pavlic <pavlic@de.ibm.com>
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*
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* $Revision: 1.5 $ $Date: 2005/04/01 21:40:41 $
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*
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*/
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#ifndef __QETH_TSO_H__
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#define __QETH_TSO_H__
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extern int
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qeth_tso_send_packet(struct qeth_card *, struct sk_buff *,
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struct qeth_qdio_out_q *, int , int);
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struct qeth_hdr_ext_tso {
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__u16 hdr_tot_len;
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__u8 imb_hdr_no;
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__u8 reserved;
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__u8 hdr_type;
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__u8 hdr_version;
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__u16 hdr_len;
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__u32 payload_len;
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__u16 mss;
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__u16 dg_hdr_len;
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__u8 padding[16];
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} __attribute__ ((packed));
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struct qeth_hdr_tso {
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struct qeth_hdr hdr; /*hdr->hdr.l3.xxx*/
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struct qeth_hdr_ext_tso ext;
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} __attribute__ ((packed));
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/*some helper functions*/
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static inline int
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qeth_get_elements_no(struct qeth_card *card, void *hdr, struct sk_buff *skb)
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{
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int elements_needed = 0;
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if (skb_shinfo(skb)->nr_frags > 0)
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elements_needed = (skb_shinfo(skb)->nr_frags + 1);
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if (elements_needed == 0 )
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elements_needed = 1 + (((((unsigned long) hdr) % PAGE_SIZE)
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+ skb->len) >> PAGE_SHIFT);
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if (elements_needed > QETH_MAX_BUFFER_ELEMENTS(card)){
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PRINT_ERR("qeth_do_send_packet: invalid size of "
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"IP packet. Discarded.");
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return 0;
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}
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return elements_needed;
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}
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static inline void
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__qeth_fill_buffer_frag(struct sk_buff *skb, struct qdio_buffer *buffer,
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int is_tso, int *next_element_to_fill)
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{
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int length = skb->len;
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struct skb_frag_struct *frag;
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int fragno;
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unsigned long addr;
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int element;
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int first_lap = 1;
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fragno = skb_shinfo(skb)->nr_frags; /* start with last frag */
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element = *next_element_to_fill + fragno;
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while (length > 0) {
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if (fragno > 0) {
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frag = &skb_shinfo(skb)->frags[fragno - 1];
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addr = (page_to_pfn(frag->page) << PAGE_SHIFT) +
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frag->page_offset;
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buffer->element[element].addr = (char *)addr;
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buffer->element[element].length = frag->size;
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length -= frag->size;
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if (first_lap)
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buffer->element[element].flags =
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SBAL_FLAGS_LAST_FRAG;
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else
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buffer->element[element].flags =
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SBAL_FLAGS_MIDDLE_FRAG;
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} else {
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buffer->element[element].addr = skb->data;
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buffer->element[element].length = length;
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length = 0;
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if (is_tso)
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buffer->element[element].flags =
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SBAL_FLAGS_MIDDLE_FRAG;
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else
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buffer->element[element].flags =
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SBAL_FLAGS_FIRST_FRAG;
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}
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element--;
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fragno--;
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first_lap = 0;
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}
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*next_element_to_fill += skb_shinfo(skb)->nr_frags + 1;
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}
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#endif /* __QETH_TSO_H__ */
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