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

Fischetti, Antonio antonio.fischetti at intel.com
Tue Oct 17 17:21:05 UTC 2017


Thanks Mark for your suggestions, I'll rework accordingly.

-Antonio

> -----Original Message-----
> From: Kavanagh, Mark B
> Sent: Tuesday, October 17, 2017 2:35 PM
> To: Fischetti, Antonio <antonio.fischetti at intel.com>; dev at openvswitch.org
> Cc: 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>
> Subject: RE: [PATCH v6 3/5] netdev-dpdk: manage empty mempool names.
> 
> >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).
> -Mark
> 
> >         return NULL;
> >     }
> >     return mp_name;
> >@@ -533,6 +536,10 @@ dpdk_mp_create(struct netdev_dpdk *dev, int mtu, bool
> >*mp_exists)
> >
> >     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.",
> >--
> >2.4.11



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