> From: Stephen Hemminger <[email protected]> > Sent: Wednesday, 15 January 2020 19:29 > To: Girard, Guillaume <[email protected]> > Cc: [email protected] > Subject: Re: [dpdk-users] rte_pktmbuf_free does not reset headroom > > On Wed, 15 Jan 2020 16:40:47 +0000 > "Girard, Guillaume" <[email protected]> wrote: > > > Hi, > > > > From my experiments prepending data to an mbuf, rte_pktmbuf_free() does > not reset the headroom. Is that intended? > > > > Thanks, > > Guillaume > > > > Intel Deutschland GmbH > > Registered Address: Am Campeon 10-12, 85579 Neubiberg, Germany > > Tel: +49 89 99 8853-0, www.intel.de > > Managing Directors: Christin Eisenschmid, Gary Kershaw Chairperson of > > the Supervisory Board: Nicole Lau Registered Office: Munich Commercial > > Register: Amtsgericht Muenchen HRB 186928 > > > > Free doesn't need to do anything to the mbuf. After free the state of the > mbuf is > indeterminate (ie. it can be what ever rte_mbuf code wants). > > The headroom is reset in rte_pktmbuf_reset() which is called by > rte_pktmbuf_alloc().
Thank you, that makes sense. In that case, I was fetching mbufs directly from the pool, which is why I saw that behavior. I will change my code. Best regards, Guillaume Intel Deutschland GmbH Registered Address: Am Campeon 10-12, 85579 Neubiberg, Germany Tel: +49 89 99 8853-0, www.intel.de Managing Directors: Christin Eisenschmid, Gary Kershaw Chairperson of the Supervisory Board: Nicole Lau Registered Office: Munich Commercial Register: Amtsgericht Muenchen HRB 186928
