From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [PATCH v6 2/5] hash: support do not free on delete
Date: Fri, 26 Oct 2018 00:55:01 +0200
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References: <1540344746-29045-1-git-send-email-honnappa.nagarahalli@arm.com>
 <1540344746-29045-3-git-send-email-honnappa.nagarahalli@arm.com>
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Cc: dev@dpdk.org, bruce.richardson@intel.com, pablo.de.lara.guarch@intel.com,
 yipeng1.wang@intel.com, dharmik.thakkar@arm.com, gavin.hu@arm.com, nd@arm.com
To: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
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24/10/2018 03:32, Honnappa Nagarahalli:
>  /**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice
> + *
> + * Free a hash key in the hash table given the position
> + * of the key. This operation is not multi-thread safe and should
> + * only be called from one thread by default. Thread safety
> + * can be enabled by setting flag during table creation.
> + * If RTE_HASH_EXTRA_FLAGS_NO_FREE_ON_DEL is enabled,
> + * this API must be called, with the key index returned by rte_hash_add_key_xxx
> + * APIs, after the key is deleted using rte_hash_del_key_xxx APIs.
> + * This API does not validate if the key is already freed.
> + *
> + * @param h
> + *   Hash table to free the key from.
> + * @param position
> + *   Position returned when the key was deleted.
> + * @return
> + *   - 0 if freed successfully
> + *   - -EINVAL if the parameters are invalid.
> + */
> +int __rte_experimental
> +rte_hash_free_key_with_position(const struct rte_hash *h,
> +                               const int32_t position);

You need to add this new function to the map file,
otherwise linking of shared library will fail.