Some PMD assumes that the RX buffers are already allocated when setting the
device MTU, because the RX buffer size depends on the MTU.
This worked until 67fe6d635193 added a call to rte_eth_dev_set_mtu() in
the init code, which would set the MTU before the RX buffer allocation,
triggering a segmentation fault with some PMD:
Stack trace of thread 20680:
#0 0x0000559464396534 qede_set_mtu (ovs-vswitchd)
#1 0x0000559464323c41 rte_eth_dev_set_mtu (ovs-vswitchd)
#2 0x00005594645f5e85 dpdk_eth_dev_queue_setup (ovs-vswitchd)
#3 0x00005594645f8ae6 netdev_dpdk_reconfigure (ovs-vswitchd)
#4 0x000055946452225c reconfigure_datapath (ovs-vswitchd)
#5 0x0000559464522d07 do_add_port (ovs-vswitchd)
#6 0x0000559464522e8d dpif_netdev_port_add (ovs-vswitchd)
#7 0x0000559464528dde dpif_port_add (ovs-vswitchd)
#8 0x00005594644dc0e0 port_add (ovs-vswitchd)
#9 0x00005594644d2ab1 ofproto_port_add (ovs-vswitchd)
#10 0x00005594644c0a85 bridge_add_ports__ (ovs-vswitchd)
#11 0x00005594644c26e8 bridge_reconfigure (ovs-vswitchd)
#12 0x00005594644c5c49 bridge_run (ovs-vswitchd)
#13 0x00005594642d4155 main (ovs-vswitchd)
#14 0x00007f0e1444bc05 __libc_start_main (libc.so.6)
#15 0x00005594642d8328 _start (ovs-vswitchd)
A possible solution could be to move the first call to
rte_eth_dev_set_mtu() just after the device start instead of
dpdk_eth_dev_queue_setup() which, by the way, set the MTU multiple times
as the call to rte_eth_dev_set_mtu() was in a loop.
CC: Mark Kavanagh <mark.b.kavan...@intel.com>
Fixes: 67fe6d635193 ("netdev-dpdk: use rte_eth_dev_set_mtu.")
Signed-off-by: Matteo Croce <mcr...@redhat.com>
---
lib/netdev-dpdk.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
index 76e79be25..229aa4a76 100644
--- a/lib/netdev-dpdk.c
+++ b/lib/netdev-dpdk.c
@@ -750,13 +750,6 @@ dpdk_eth_dev_queue_setup(struct netdev_dpdk *dev, int
n_rxq, int n_txq)
break;
}
- diag = rte_eth_dev_set_mtu(dev->port_id, dev->mtu);
- if (diag) {
- VLOG_ERR("Interface %s MTU (%d) setup error: %s",
- dev->up.name, dev->mtu, rte_strerror(-diag));
- break;
- }
-
for (i = 0; i < n_txq; i++) {
diag = rte_eth_tx_queue_setup(dev->port_id, i, dev->txq_size,
dev->socket_id, NULL);
@@ -849,6 +842,13 @@ dpdk_eth_dev_init(struct netdev_dpdk *dev)
return -diag;
}
+ diag = rte_eth_dev_set_mtu(dev->port_id, dev->mtu);
+ if (diag) {
+ VLOG_ERR("Interface %s MTU (%d) setup error: %s",
+ dev->up.name, dev->mtu, rte_strerror(-diag));
+ return -diag;
+ }
+
rte_eth_promiscuous_enable(dev->port_id);
rte_eth_allmulticast_enable(dev->port_id);
--
2.13.6
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