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| author | Julian Wiedmann <jwi@linux.vnet.ibm.com> | 2017-12-01 10:14:49 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-12-02 21:35:20 -0500 |
| commit | bc3ab70584696cb798b9e1e0ac8e6ced5fd4c3b8 (patch) | |
| tree | 4bc7a73a704b1a4350ae951599ce7a39405c91ab /drivers/s390 | |
| parent | 7344ba039f4fc5fb18be5618199827e246b0c697 (diff) | |
| download | linux-bc3ab70584696cb798b9e1e0ac8e6ced5fd4c3b8.tar.bz2 | |
s390/qeth: fix thinko in IPv4 multicast address tracking
Commit 5f78e29ceebf ("qeth: optimize IP handling in rx_mode callback")
reworked how secondary addresses are managed for qeth devices.
Instead of dropping & subsequently re-adding all addresses on every
ndo_set_rx_mode() call, qeth now keeps track of the addresses that are
currently registered with the HW.
On a ndo_set_rx_mode(), we thus only need to do (de-)registration
requests for the addresses that have actually changed.
On L3 devices, the lookup for IPv4 Multicast addresses checks the wrong
hashtable - and thus never finds a match. As a result, we first delete
*all* such addresses, and then re-add them again. So each set_rx_mode()
causes a short period where the IPv4 Multicast addresses are not
registered, and the card stops forwarding inbound traffic for them.
Fix this by setting the ->is_multicast flag on the lookup object, thus
enabling qeth_l3_ip_from_hash() to search the correct hashtable and
find a match there.
Fixes: 5f78e29ceebf ("qeth: optimize IP handling in rx_mode callback")
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/net/qeth_l3_main.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c index aadd384316a3..e79936b50698 100644 --- a/drivers/s390/net/qeth_l3_main.c +++ b/drivers/s390/net/qeth_l3_main.c @@ -1376,6 +1376,7 @@ qeth_l3_add_mc_to_hash(struct qeth_card *card, struct in_device *in4_dev) tmp->u.a4.addr = be32_to_cpu(im4->multiaddr); memcpy(tmp->mac, buf, sizeof(tmp->mac)); + tmp->is_multicast = 1; ipm = qeth_l3_ip_from_hash(card, tmp); if (ipm) { |