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

[Ye Xiaolong <xiaolong.ye@intel.com>]

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?

>- 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.

>
>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."



Thanks,
Xiaolong

>+	}
> }
> 
> static int
>-- 
>2.17.1
>