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author | Julian Wiedmann <jwi@linux.ibm.com> | 2019-04-17 18:17:32 +0200 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2019-04-17 10:33:59 -0700 |
commit | 3a18d75400ff14cf3518637579974e22aa0113bd (patch) | |
tree | 9b5b8075a411b71a25296f58853793994b116617 /drivers/s390/net/qeth_core_sys.c | |
parent | 333ef9d1d5fb68b5f53c5f7f3ceafb65a8a6ff7e (diff) | |
download | blackbird-op-linux-3a18d75400ff14cf3518637579974e22aa0113bd.tar.gz blackbird-op-linux-3a18d75400ff14cf3518637579974e22aa0113bd.zip |
s390/qeth: add TX multiqueue support for IQD devices
qeth has been supporting multiple HW Output Queues for a long time. But
rather than exposing those queues to the stack, it uses its own queue
selection logic in .ndo_start_xmit... with all the drawbacks that
entails.
Start off by switching IQD devices over to a proper mqs net_device,
and converting all the netdev_queue management code.
One oddity with IQD devices is the requirement to place all mcast
traffic on the _highest_ established HW queue. Doing so via
.ndo_select_queue seems straight-forward - but that won't work if only
some of the HW queues are active
(ie. when dev->real_num_tx_queues < dev->num_tx_queues), since
netdev_cap_txqueue() will not allow us to put skbs on the higher queues.
To make this work, we
1. let .ndo_select_queue() map all mcast traffic to netdev_queue 0, and
2. later re-map the netdev_queue and HW queue indices in
.ndo_start_xmit and the TX completion handler.
With this patch we default to a fixed set of 1 ucast and 1 mcast queue.
Support for dynamic reconfiguration is added at a later time.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390/net/qeth_core_sys.c')
-rw-r--r-- | drivers/s390/net/qeth_core_sys.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_core_sys.c b/drivers/s390/net/qeth_core_sys.c index 56deeb6f7bc0..b43d8bdf4c3e 100644 --- a/drivers/s390/net/qeth_core_sys.c +++ b/drivers/s390/net/qeth_core_sys.c @@ -198,6 +198,9 @@ static ssize_t qeth_dev_prioqing_store(struct device *dev, if (!card) return -EINVAL; + if (IS_IQD(card)) + return -EOPNOTSUPP; + mutex_lock(&card->conf_mutex); if (card->state != CARD_STATE_DOWN) { rc = -EPERM; |