Re: [dpdk-stable] [dpdk-dev] [PATCH v2 1/4] net/ice: fix memzone reserve and release in FDIR

["Wang, ShougangX" <shougangx.wang@intel.com>]

Hi, Xiaolong

> -----Original Message-----
> From: Ye, Xiaolong
> Sent: Monday, November 11, 2019 4:10 PM
> To: Wang, ShougangX <shougangx.wang@intel.com>
> Cc: dev@dpdk.org; Yang, Qiming <qiming.yang@intel.com>; Xing, Beilei
> <beilei.xing@intel.com>; stable@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v2 1/4] net/ice: fix memzone reserve and
> release in FDIR
> 
> On 11/07, Wang ShougangX wrote:
> >To avoid memzone reserve failure and memory leak, following resources
> >management should be added.
> >- Check if the FDIR Memzone already exists before reserving.
> 
> In what scenario it will reserve FDIR memzone twice?

Currently, there is no scenario.
It is a failsafe method, just like i40e_memzone_reserve().

> 
> >- Free FDIR memzone when teardown and other failure scenarios.
> >
> >Fixes: 84dc7a95a2d3 ("net/ice: enable flow director engine")
> >Cc: stable@dpdk.org
> 
> No need to cc stable since commit  84dc7a95a2d3 is in this release.

Got it.

> 
> >
> >Signed-off-by: Wang ShougangX <shougangx.wang@intel.com>
> >---
> > drivers/net/ice/ice_ethdev.h      |  1 +
> > drivers/net/ice/ice_fdir_filter.c | 19 ++++++++++++++++++-
> > 2 files changed, 19 insertions(+), 1 deletion(-)
> >
> >diff --git a/drivers/net/ice/ice_ethdev.h
> >b/drivers/net/ice/ice_ethdev.h index de67e5934..0a39ca6ff 100644
> >--- a/drivers/net/ice/ice_ethdev.h
> >+++ b/drivers/net/ice/ice_ethdev.h
> >@@ -325,6 +325,7 @@ struct ice_fdir_info {
> > 	struct ice_rx_queue *rxq;
> > 	void *prg_pkt;                 /* memory for fdir program packet */
> > 	uint64_t dma_addr;             /* physic address of packet memory*/
> >+	const struct rte_memzone *mz;
> > 	struct ice_fdir_filter_conf conf;
> >
> > 	struct ice_fdir_filter_conf **hash_map; diff --git
> >a/drivers/net/ice/ice_fdir_filter.c b/drivers/net/ice/ice_fdir_filter.c
> >index 736ccd54e..31705c164 100644
> >--- a/drivers/net/ice/ice_fdir_filter.c
> >+++ b/drivers/net/ice/ice_fdir_filter.c
> >@@ -140,6 +140,12 @@ static struct ice_flow_parser
> >ice_fdir_parser_comms;  static const struct rte_memzone *
> >ice_memzone_reserve(const char *name, uint32_t len, int socket_id)  {
> >+	const struct rte_memzone *mz;
> >+
> >+	mz = rte_memzone_lookup(name);
> >+	if (mz)
> >+		return mz;
> >+
> > 	return rte_memzone_reserve_aligned(name, len, socket_id,
> > 					   RTE_MEMZONE_IOVA_CONTIG,
> > 					   ICE_RING_BASE_ALIGN);
> >@@ -493,19 +499,23 @@ ice_fdir_setup(struct ice_pf *pf)
> > 	}
> > 	pf->fdir.prg_pkt = mz->addr;
> > 	pf->fdir.dma_addr = mz->iova;
> >+	pf->fdir.mz = mz;
> >
> > 	err = ice_fdir_prof_alloc(hw);
> > 	if (err) {
> > 		PMD_DRV_LOG(ERR, "Cannot allocate memory for "
> > 			    "flow director profile.");
> > 		err = -ENOMEM;
> >-		goto fail_mem;
> >+		goto fail_prof;
> > 	}
> >
> > 	PMD_DRV_LOG(INFO, "FDIR setup successfully, with programming
> queue %u.",
> > 		    vsi->base_queue);
> > 	return ICE_SUCCESS;
> >
> >+fail_prof:
> >+	rte_memzone_free(pf->fdir.mz);
> >+	pf->fdir.mz = NULL;
> > fail_mem:
> > 	ice_rx_queue_release(pf->fdir.rxq);
> > 	pf->fdir.rxq = NULL;
> >@@ -619,6 +629,13 @@ ice_fdir_teardown(struct ice_pf *pf)
> > 	ice_fdir_prof_free(hw);
> > 	ice_release_vsi(vsi);
> > 	pf->fdir.fdir_vsi = NULL;
> >+
> >+	if (pf->fdir.mz) {
> >+		err = rte_memzone_free(pf->fdir.mz);
> >+		pf->fdir.mz = NULL;
> >+		if (err)
> >+			PMD_DRV_LOG(ERR, "Failed to free memezone.");
> 
> Be more specific about the error, like "Failed to free memzone for flow
> director."

Got it.

> 
> 
> 
> Thanks,
> Xiaolong
> 
> >+	}
> > }
> >
> > static int
> >--
> >2.17.1
> >

Thanks.
Shougang