[dpdk-dev] [PATCH 1/2] librte_ethdev: Introduce a function to release HW rings
Burakov, Anatoly
anatoly.burakov at intel.com
Tue May 5 12:25:04 CEST 2020
On 03-May-20 5:26 PM, Renata Saiakhova wrote:
> Free previously allocated memzone for HW rings
>
> Signed-off-by: Renata Saiakhova <Renata.Saiakhova at ekinops.com>
> ---
> lib/librte_ethdev/rte_ethdev.c | 23 +++++++++++++++++++++++
> lib/librte_ethdev/rte_ethdev_driver.h | 14 ++++++++++++++
> lib/librte_ethdev/rte_ethdev_version.map | 1 +
> 3 files changed, 38 insertions(+)
>
> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
> index 72aed59a5..c6d27e1aa 100644
> --- a/lib/librte_ethdev/rte_ethdev.c
> +++ b/lib/librte_ethdev/rte_ethdev.c
> @@ -4206,6 +4206,29 @@ rte_eth_dma_zone_reserve(const struct rte_eth_dev *dev, const char *ring_name,
> RTE_MEMZONE_IOVA_CONTIG, align);
> }
>
> +int
> +rte_eth_dma_zone_free(const struct rte_eth_dev *dev, const char *ring_name,
> + uint16_t queue_id)
> +{
> + char z_name[RTE_MEMZONE_NAMESIZE];
> + const struct rte_memzone *mz;
> + int rc = 0;
> +
> + snprintf(z_name, sizeof(z_name), "eth_p%d_q%d_%s",
> + dev->data->port_id, queue_id, ring_name);
> + if (rc >= RTE_MEMZONE_NAMESIZE) {
> + RTE_ETHDEV_LOG(ERR, "ring name too long\n");
> + rte_errno = ENAMETOOLONG;
> + return NULL;
> + }
> +
> + mz = rte_memzone_lookup(z_name);
> + if (mz)
> + rc = rte_memzone_free(mz);
This is racy. Please just use rte_memzone_free() unconditionally. It'll
return 0 if memzone existed, or will set rte_errno to EINVAL if it
didn't. (this is suboptimal, it should be ENOENT, but changing this
would be an API break... I'll submit a patch for future release to fix this)
--
Thanks,
Anatoly
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