[ovs-dev] [PATCH v6 3/5] netdev-dpdk: manage empty mempool names.

Kavanagh, Mark B mark.b.kavanagh at intel.com
Tue Oct 17 13:35:17 UTC 2017

>From: Fischetti, Antonio
>Sent: Monday, October 16, 2017 2:15 PM
>To: dev at openvswitch.org
>Cc: Kavanagh, Mark B <mark.b.kavanagh at intel.com>; Darrell Ball
><dlu998 at gmail.com>; Loftus, Ciara <ciara.loftus at intel.com>; Kevin Traynor
><ktraynor at redhat.com>; Aaron Conole <aconole at redhat.com>; Fischetti, Antonio
><antonio.fischetti at intel.com>
>Subject: [PATCH v6 3/5] netdev-dpdk: manage empty mempool names.

It's not just empty names - the name could also be too long. Probably best to rephrase the commit name accordingly.

>In case a mempool name could not be generated log a message
>and return a null mempool pointer to the caller.
>CC: Mark B Kavanagh <mark.b.kavanagh at intel.com>
>CC: Darrell Ball <dlu998 at gmail.com>
>CC: Ciara Loftus <ciara.loftus at intel.com>
>CC: Kevin Traynor <ktraynor at redhat.com>
>CC: Aaron Conole <aconole at redhat.com>
>Signed-off-by: Antonio Fischetti <antonio.fischetti at intel.com>
> lib/netdev-dpdk.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
>index 07c438a..dd5759b 100644
>--- a/lib/netdev-dpdk.c
>+++ b/lib/netdev-dpdk.c
>@@ -502,6 +502,9 @@ dpdk_mp_name(struct dpdk_mp *dmp)
>     int ret = snprintf(mp_name, RTE_MEMPOOL_NAMESIZE, "ovs_%x_%d_%d_%u",
>                        h, dmp->socket_id, dmp->mtu, dmp->mp_size);
>     if (ret < 0 || ret >= RTE_MEMPOOL_NAMESIZE) {
>+        VLOG_ERR("Failed to generate a mempool name for \"%s\". "
>+            "Hash:0x%x, mtu:%d, mbufs:%u, ret:%d",
>+            dmp->if_name, h, dmp->mtu, dmp->mp_size, ret);

A string from ovs_strerror(ret) would probably be more useful than the return value itself here.
I'm not sure how useful the individual values themselves are in an ERR log either (more suited to a DBG log).

>         return NULL;
>     }
>     return mp_name;
>@@ -533,6 +536,10 @@ dpdk_mp_create(struct netdev_dpdk *dev, int mtu, bool
>     do {
>         char *mp_name = dpdk_mp_name(dmp);
>+        if (!mp_name) {
>+            rte_free(dmp);
>+            return NULL;
>+        }
>         VLOG_DBG("Requesting a mempool of %u mbufs for netdev %s "
>                  "with %d Rx and %d Tx queues, socket id:%d.",

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