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s390/qeth: don't use restricted offloads for local traffic

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Current OSA models don't support TSO for traffic to local next-hops, and
some old models didn't offer TX CSO for such packets either.

So as part of .ndo_features_check, check if a packet's next-hop resides
on the same OSA Adapter. Opt out from affected HW offloads accordingly.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann
2020-05-06 10:09:44 +02:00
committed by David S. Miller
parent 1d38c2e494
commit c619e9a6f5
2 changed files with 81 additions and 4 deletions
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drivers/s390/net/qeth_l2_main.c
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@@ -710,6 +710,7 @@ static int qeth_l2_setup_netdev(struct qeth_card *card)
if (card->dev->hw_features & (NETIF_F_TSO | NETIF_F_TSO6)) {
card->dev->needed_headroom = sizeof(struct qeth_hdr_tso);
netif_keep_dst(card->dev);
netif_set_gso_max_size(card->dev,
PAGE_SIZE * (QDIO_MAX_ELEMENTS_PER_BUFFER - 1));
}