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| author |   David S. Miller <davem@davemloft.net> | 2016-11-07 20:15:56 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-11-07 20:15:56 -0500 |
| commit | 5f7f75027f89b741a977db730abd66695fe75f2d (patch) | |
| tree | fd0201d39d33a237267cf9c0ca62166e3b246469 | |
| parent | Merge branch 'udp-fwd-mem-sched-on-dequeue' (diff) | |
| parent | qdisc: catch misconfig of attaching qdisc to tx_queue_len zero device (diff) | |
| download | linux-dev-5f7f75027f89b741a977db730abd66695fe75f2d.tar.xz linux-dev-5f7f75027f89b741a977db730abd66695fe75f2d.zip | |
Merge branch 'IFF_NO_QUEUE-semantics'
Jesper Dangaard Brouer says:
====================
qdisc and tx_queue_len cleanups for IFF_NO_QUEUE devices
This patchset is a cleanup for IFF_NO_QUEUE devices. It will
hopefully help userspace get a more consistent behavior when attaching
qdisc to such virtual devices.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/net/pkt_sched.h | 2 | ||||
| -rw-r--r-- | net/core/dev.c | 2 | ||||
| -rw-r--r-- | net/ethernet/eth.c | 3 | ||||
| -rw-r--r-- | net/sched/sch_api.c | 11 |
4 files changed, 16 insertions, 2 deletions
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h index cd334c9584e9..f1b76b8e6d2d 100644 --- a/include/net/pkt_sched.h +++ b/include/net/pkt_sched.h @@ -6,6 +6,8 @@ #include <linux/if_vlan.h> #include <net/sch_generic.h> +#define DEFAULT_TX_QUEUE_LEN 1000 + struct qdisc_walker { int stop; int skip; diff --git a/net/core/dev.c b/net/core/dev.c index f23e28668f32..0260ad314506 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -7651,7 +7651,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, if (!dev->tx_queue_len) { dev->priv_flags |= IFF_NO_QUEUE; - dev->tx_queue_len = 1; + dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; } dev->num_tx_queues = txqs; diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c index d9e2fe1da724..8c5a479681ca 100644 --- a/net/ethernet/eth.c +++ b/net/ethernet/eth.c @@ -62,6 +62,7 @@ #include <net/dsa.h> #include <net/flow_dissector.h> #include <linux/uaccess.h> +#include <net/pkt_sched.h> __setup("ether=", netdev_boot_setup); @@ -359,7 +360,7 @@ void ether_setup(struct net_device *dev) dev->min_mtu = ETH_MIN_MTU; dev->max_mtu = ETH_DATA_LEN; dev->addr_len = ETH_ALEN; - dev->tx_queue_len = 1000; /* Ethernet wants good queues */ + dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; dev->flags = IFF_BROADCAST|IFF_MULTICAST; dev->priv_flags |= IFF_TX_SKB_SHARING; diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 206dc24add3a..f337f1bdd1d4 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -960,6 +960,17 @@ static struct Qdisc *qdisc_create(struct net_device *dev, sch->handle = handle; + /* This exist to keep backward compatible with a userspace + * loophole, what allowed userspace to get IFF_NO_QUEUE + * facility on older kernels by setting tx_queue_len=0 (prior + * to qdisc init), and then forgot to reinit tx_queue_len + * before again attaching a qdisc. + */ + if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) { + dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; + netdev_info(dev, "Caught tx_queue_len zero misconfig\n"); + } + if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { if (qdisc_is_percpu_stats(sch)) { sch->cpu_bstats = |