[ovs-dev] [PATCH v4 1/6] netdev-dpdk: fix management of pre-existing mempools.

antonio.fischetti at intel.com antonio.fischetti at intel.com
Fri Oct 6 16:45:02 UTC 2017


Fix an issue on reconfiguration of pre-existing mempools.
This patch avoids to call dpdk_mp_put() - and erroneously
release the mempool - when it already exists.

CC: Kevin Traynor <ktraynor at redhat.com>
CC: Aaron Conole <aconole at redhat.com>
CC: Darrell Ball <dlu998 at gmail.com>
Reported-by: Ciara Loftus <ciara.loftus at intel.com>
Tested-by: Ciara Loftus <ciara.loftus at intel.com>
Fixes: d555d9bded5f ("netdev-dpdk: Create separate memory pool for each port.")
Signed-off-by: Antonio Fischetti <antonio.fischetti at intel.com>
---
I've tested this patch by
  - changing at run-time the number of Rx queues:
      ovs-vsctl set Interface dpdk0 type=dpdk options:n_rxq=4

  - reducing the MTU of the dpdk ports of 1 byte to force
    the configuration of an existing mempool:
      ovs-vsctl set Interface dpdk0 mtu_request=1499

This issue was observed in a PVP test topology with dpdkvhostuserclient
ports. It can happen also with dpdk type ports, eg by reducing the MTU
of 1 byte.

To replicate the bug scenario in the PVP case it's sufficient to
set 1 dpdkvhostuserclient port, and just boot the VM.

Below some more details on my own test setup.

 PVP test setup
 --------------
CLIENT_SOCK_DIR=/tmp
SOCK0=dpdkvhostuser0
SOCK1=dpdkvhostuser1

1 PMD
Add 2 dpdk ports, n_rxq=1
Add 2 vhu ports both of type dpdkvhostuserclient and specify vhost-server-path
 ovs-vsctl set Interface dpdkvhostuser0 options:vhost-server-path="$CLIENT_SOCK_DIR/$SOCK0"
 ovs-vsctl set Interface dpdkvhostuser1 options:vhost-server-path="$CLIENT_SOCK_DIR/$SOCK1"

Set port-based rules: dpdk0 <--> vhu0 and dpdk1 <--> vhu1
 add-flow br0 in_port=1,action=output:3
 add-flow br0 in_port=3,action=output:1
 add-flow br0 in_port=4,action=output:2
 add-flow br0 in_port=2,action=output:4

 Launch QEMU
 -----------
As OvS vhu ports are acting as clients, we must specify 'server' in the next command.
VM_IMAGE=<path/to/your/vm/image>

 sudo -E taskset 0x3F00 $QEMU_DIR/x86_64-softmmu/qemu-system-x86_64 -name us-vhost-vm1 -cpu host -enable-kvm -m 4096M -object memory-backend-file,id=mem,size=4096M,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -mem-prealloc -smp 4 -drive file=$VM_IMAGE -chardev socket,id=char0,path=$CLIENT_SOCK_DIR/$SOCK0,server -netdev type=vhost-user,id=mynet1,chardev=char0,vhostforce -device virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off -chardev socket,id=char1,path=$CLIENT_SOCK_DIR/$SOCK1,server -netdev type=vhost-user,id=mynet2,chardev=char1,vhostforce -device virtio-net-pci,mac=00:00:00:00:00:02,netdev=mynet2,mrg_rxbuf=off --nographic

 Expected behavior
 -----------------
With this fix OvS shouldn't crash.
---
 lib/netdev-dpdk.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
index c60f46f..80a6ff3 100644
--- a/lib/netdev-dpdk.c
+++ b/lib/netdev-dpdk.c
@@ -508,7 +508,7 @@ dpdk_mp_name(struct dpdk_mp *dmp)
 }
 
 static struct dpdk_mp *
-dpdk_mp_create(struct netdev_dpdk *dev, int mtu)
+dpdk_mp_create(struct netdev_dpdk *dev, int mtu, bool *mp_exists)
 {
     struct dpdk_mp *dmp = dpdk_rte_mzalloc(sizeof *dmp);
     if (!dmp) {
@@ -530,8 +530,6 @@ dpdk_mp_create(struct netdev_dpdk *dev, int mtu)
             + MIN(RTE_MAX_LCORE, dev->requested_n_rxq) * NETDEV_MAX_BURST
             + MIN_NB_MBUF;
 
-    bool mp_exists = false;
-
     do {
         char *mp_name = dpdk_mp_name(dmp);
 
@@ -559,7 +557,7 @@ dpdk_mp_create(struct netdev_dpdk *dev, int mtu)
             /* As the mempool create returned EEXIST we can expect the
              * lookup has returned a valid pointer.  If for some reason
              * that's not the case we keep track of it. */
-            mp_exists = true;
+            *mp_exists = true;
         } else {
             VLOG_ERR("Failed mempool \"%s\" create request of %u mbufs",
                      mp_name, dmp->mp_size);
@@ -573,7 +571,7 @@ dpdk_mp_create(struct netdev_dpdk *dev, int mtu)
             rte_mempool_obj_iter(dmp->mp, ovs_rte_pktmbuf_init, NULL);
             return dmp;
         }
-    } while (!mp_exists &&
+    } while (!(*mp_exists) &&
             (rte_errno == ENOMEM && (dmp->mp_size /= 2) >= MIN_NB_MBUF));
 
     rte_free(dmp);
@@ -581,12 +579,12 @@ dpdk_mp_create(struct netdev_dpdk *dev, int mtu)
 }
 
 static struct dpdk_mp *
-dpdk_mp_get(struct netdev_dpdk *dev, int mtu)
+dpdk_mp_get(struct netdev_dpdk *dev, int mtu, bool *mp_exists)
 {
     struct dpdk_mp *dmp;
 
     ovs_mutex_lock(&dpdk_mp_mutex);
-    dmp = dpdk_mp_create(dev, mtu);
+    dmp = dpdk_mp_create(dev, mtu, mp_exists);
     ovs_mutex_unlock(&dpdk_mp_mutex);
 
     return dmp;
@@ -620,14 +618,17 @@ netdev_dpdk_mempool_configure(struct netdev_dpdk *dev)
 {
     uint32_t buf_size = dpdk_buf_size(dev->requested_mtu);
     struct dpdk_mp *mp;
+    bool mp_exists = false;
 
-    mp = dpdk_mp_get(dev, FRAME_LEN_TO_MTU(buf_size));
+    mp = dpdk_mp_get(dev, FRAME_LEN_TO_MTU(buf_size), &mp_exists);
     if (!mp) {
         VLOG_ERR("Failed to create memory pool for netdev "
                  "%s, with MTU %d on socket %d: %s\n",
                  dev->up.name, dev->requested_mtu, dev->requested_socket_id,
                  rte_strerror(rte_errno));
         return rte_errno;
+    } else if (mp_exists) {
+        return EEXIST;
     } else {
         dpdk_mp_put(dev->dpdk_mp);
         dev->dpdk_mp = mp;
@@ -3207,7 +3208,7 @@ netdev_dpdk_reconfigure(struct netdev *netdev)
     rte_eth_dev_stop(dev->port_id);
 
     err = netdev_dpdk_mempool_configure(dev);
-    if (err) {
+    if (err && err != EEXIST) {
         goto out;
     }
 
@@ -3247,12 +3248,12 @@ dpdk_vhost_reconfigure_helper(struct netdev_dpdk *dev)
     netdev_dpdk_remap_txqs(dev);
 
     err = netdev_dpdk_mempool_configure(dev);
-    if (err) {
-        return err;
-    } else {
+    if (!err) {
+        /* A new mempool was created. */
         netdev_change_seq_changed(&dev->up);
+    } else if (err != EEXIST){
+        return err;
     }
-
     if (netdev_dpdk_get_vid(dev) >= 0) {
         if (dev->vhost_reconfigured == false) {
             dev->vhost_reconfigured = true;
-- 
2.4.11



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