src/patches/suse-2.6.27.31/patches.arch/s390-13-03-qeth_checksum.patch

   1 From: Gerald Schaefer <geraldsc@de.ibm.com>
   2 Subject: qeth: improve no_checksumming handling for layer3
   3 References: bnc#499845,LTC#53306
   4
   5 Symptom:     Messages "hw csum failure" when tcpdump is running
   6 Problem:     If sysfs-attribute checksumming is set to
   7              "no-checksumming" for a layer3 qeth device, incoming
   8              data is stored in skbs with incorrect setting of
   9              skb->ip_summed.
  10 Solution:    Set skb->ip_summed to CHECKSUM_UNNECESSARY if
  11              RX-checksumming is not required.
  12
  13 Acked-by: John Jolly <jjolly@suse.de>
  14 ---
  15  drivers/s390/net/qeth_l3_main.c |   20 +++++++++++++-------
  16  1 file changed, 13 insertions(+), 7 deletions(-)
  17
  18 Index: linux-sles11/drivers/s390/net/qeth_l3_main.c
  19 ===================================================================
  20 --- linux-sles11.orig/drivers/s390/net/qeth_l3_main.c
  21 +++ linux-sles11/drivers/s390/net/qeth_l3_main.c
  22 @@ -1939,16 +1939,22 @@ static inline __u16 qeth_l3_rebuild_skb(
  23                  hdr->hdr.l3.vlan_id : *((u16 *)&hdr->hdr.l3.dest_addr[12]);
  24         }
  25
  26 -       skb->ip_summed = card->options.checksum_type;
  27 -       if (card->options.checksum_type == HW_CHECKSUMMING) {
  28 +       switch (card->options.checksum_type) {
  29 +       case SW_CHECKSUMMING:
  30 +               skb->ip_summed = CHECKSUM_NONE;
  31 +               break;
  32 +       case NO_CHECKSUMMING:
  33 +               skb->ip_summed = CHECKSUM_UNNECESSARY;
  34 +               break;
  35 +       case HW_CHECKSUMMING:
  36                 if ((hdr->hdr.l3.ext_flags &
  37 -                     (QETH_HDR_EXT_CSUM_HDR_REQ |
  38 -                      QETH_HDR_EXT_CSUM_TRANSP_REQ)) ==
  39 -                    (QETH_HDR_EXT_CSUM_HDR_REQ |
  40 -                     QETH_HDR_EXT_CSUM_TRANSP_REQ))
  41 +                   (QETH_HDR_EXT_CSUM_HDR_REQ |
  42 +                    QETH_HDR_EXT_CSUM_TRANSP_REQ)) ==
  43 +                   (QETH_HDR_EXT_CSUM_HDR_REQ |
  44 +                    QETH_HDR_EXT_CSUM_TRANSP_REQ))
  45                         skb->ip_summed = CHECKSUM_UNNECESSARY;
  46                 else
  47 -                       skb->ip_summed = SW_CHECKSUMMING;
  48 +                       skb->ip_summed = CHECKSUM_NONE;
  49         }
  50
  51         return vlan_id;