[PATCH 4.19 529/639] net/sched: cbs: Set default link speed to 10 Mbps in cbs_set_port_rate

From: Greg Kroah-Hartman
Date: Fri Jan 24 2020 - 06:30:28 EST


From: Vladimir Oltean <olteanv@xxxxxxxxx>

[ Upstream commit 1c6c09a0ae62fa3ea8f8ead2ac3920e6fff2de64 ]

The discussion to be made is absolutely the same as in the case of
previous patch ("taprio: Set default link speed to 10 Mbps in
taprio_set_picos_per_byte"). Nothing is lost when setting a default.

Cc: Leandro Dorileo <leandro.maciel.dorileo@xxxxxxxxx>
Fixes: e0a7683d30e9 ("net/sched: cbs: fix port_rate miscalculation")
Acked-by: Vinicius Costa Gomes <vinicius.gomes@xxxxxxxxx>
Signed-off-by: Vladimir Oltean <olteanv@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/sched/sch_cbs.c | 19 +++++++++++--------
1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/net/sched/sch_cbs.c b/net/sched/sch_cbs.c
index b3c8d04929df2..289f66b9238d3 100644
--- a/net/sched/sch_cbs.c
+++ b/net/sched/sch_cbs.c
@@ -185,11 +185,6 @@ static struct sk_buff *cbs_dequeue_soft(struct Qdisc *sch)
s64 credits;
int len;

- if (atomic64_read(&q->port_rate) == -1) {
- WARN_ONCE(1, "cbs: dequeue() called with unknown port rate.");
- return NULL;
- }
-
if (q->credits < 0) {
credits = timediff_to_credits(now - q->last, q->idleslope);

@@ -307,11 +302,19 @@ static int cbs_enable_offload(struct net_device *dev, struct cbs_sched_data *q,
static void cbs_set_port_rate(struct net_device *dev, struct cbs_sched_data *q)
{
struct ethtool_link_ksettings ecmd;
+ int speed = SPEED_10;
int port_rate = -1;
+ int err;
+
+ err = __ethtool_get_link_ksettings(dev, &ecmd);
+ if (err < 0)
+ goto skip;
+
+ if (ecmd.base.speed != SPEED_UNKNOWN)
+ speed = ecmd.base.speed;

- if (!__ethtool_get_link_ksettings(dev, &ecmd) &&
- ecmd.base.speed != SPEED_UNKNOWN)
- port_rate = ecmd.base.speed * 1000 * BYTES_PER_KBIT;
+skip:
+ port_rate = speed * 1000 * BYTES_PER_KBIT;

atomic64_set(&q->port_rate, port_rate);
netdev_dbg(dev, "cbs: set %s's port_rate to: %lld, linkspeed: %d\n",
--
2.20.1