diff options
Diffstat (limited to 'drivers/s390/net/qeth_tso.h')
| -rw-r--r-- | drivers/s390/net/qeth_tso.h | 71 |
1 files changed, 58 insertions, 13 deletions
diff --git a/drivers/s390/net/qeth_tso.h b/drivers/s390/net/qeth_tso.h index 83504dee3f5..ff585ae49b6 100644 --- a/drivers/s390/net/qeth_tso.h +++ b/drivers/s390/net/qeth_tso.h @@ -1,5 +1,5 @@ /* - * linux/drivers/s390/net/qeth_tso.h ($Revision: 1.4 $) + * linux/drivers/s390/net/qeth_tso.h ($Revision: 1.5 $) * * Header file for qeth TCP Segmentation Offload support. * @@ -7,7 +7,7 @@ * * Author(s): Frank Pavlic <pavlic@de.ibm.com> * - * $Revision: 1.4 $ $Date: 2005/03/24 09:04:18 $ + * $Revision: 1.5 $ $Date: 2005/04/01 21:40:41 $ * */ #ifndef __QETH_TSO_H__ @@ -37,22 +37,67 @@ struct qeth_hdr_tso { } __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; + 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; } - return elements_needed; + *next_element_to_fill += skb_shinfo(skb)->nr_frags + 1; } + #endif /* __QETH_TSO_H__ */ |