diff options
| author | David S. Miller <davem@davemloft.net> | 2020-04-24 16:44:55 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-04-24 16:44:55 -0700 |
| commit | 6861d6d9cf36eac894ad235e75b3cf8bc0590f62 (patch) | |
| tree | 7f1350e7a0f69d89c3506217c4bd32e4f6f8dfd9 | |
| parent | 92dc39fd4047c8fb7573df5247a81717bc10e247 (diff) | |
| parent | b89c1e6bdc73f5775e118eb2ab778e75b262b30c (diff) | |
| download | linux-6861d6d9cf36eac894ad235e75b3cf8bc0590f62.tar.bz2 | |
Merge branch 'qdisc-noop'
Jesper Dangaard Brouer says:
====================
Fix qdisc noop issue caused by driver and identify future bugs
I've been very puzzled why networking on my NXP development board,
using driver dpaa2-eth, stopped working when I updated the kernel
version >= 5.3. The observable issue were that interface would drop
all TX packets, because it had assigned the qdisc noop.
This turned out the be a NIC driver bug, that would only get triggered
when using sysctl net/core/default_qdisc=fq_codel. It was non-trivial
to find out[1] this was driver related. Thus, this patchset besides
fixing the driver bug, also helps end-user identify the issue.
[1]: https://github.com/xdp-project/xdp-project/blob/master/areas/arm64/board_nxp_ls1088/nxp-board04-troubleshoot-qdisc.org
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 4 | ||||
| -rw-r--r-- | net/sched/cls_api.c | 5 |
2 files changed, 6 insertions, 3 deletions
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c index 9d4061bba0b8..d271c016229d 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c @@ -2021,7 +2021,7 @@ static int dpaa2_eth_setup_tc(struct net_device *net_dev, int i; if (type != TC_SETUP_QDISC_MQPRIO) - return -EINVAL; + return -EOPNOTSUPP; mqprio->hw = TC_MQPRIO_HW_OFFLOAD_TCS; num_queues = dpaa2_eth_queue_count(priv); @@ -2033,7 +2033,7 @@ static int dpaa2_eth_setup_tc(struct net_device *net_dev, if (num_tc > dpaa2_eth_tc_count(priv)) { netdev_err(net_dev, "Max %d traffic classes supported\n", dpaa2_eth_tc_count(priv)); - return -EINVAL; + return -EOPNOTSUPP; } if (!num_tc) { diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index 55bd1429678f..11b683c45c28 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -735,8 +735,11 @@ static int tcf_block_offload_cmd(struct tcf_block *block, INIT_LIST_HEAD(&bo.cb_list); err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo); - if (err < 0) + if (err < 0) { + if (err != -EOPNOTSUPP) + NL_SET_ERR_MSG(extack, "Driver ndo_setup_tc failed"); return err; + } return tcf_block_setup(block, &bo); } |