[dpdk-dev] [dpdk-stable] [PATCH 1/2] mempool: use actual IOVA addresses when populating
Li, WenjieX A
wenjiex.a.li at intel.com
Tue Nov 19 02:45:29 CET 2019
Tested-by: Chen, BoX C <box.c.chen at intel.com>
> -----Original Message-----
> From: stable [mailto:stable-bounces at dpdk.org] On Behalf Of Anatoly Burakov
> Sent: Thursday, November 14, 2019 9:58 PM
> To: dev at dpdk.org
> Cc: Olivier Matz <olivier.matz at 6wind.com>; Andrew Rybchenko
> <arybchenko at solarflare.com>; david.marchand at redhat.com; stable at dpdk.org
> Subject: [dpdk-stable] [PATCH 1/2] mempool: use actual IOVA addresses when
> populating
>
> Currently, when mempool is being populated, we get IOVA address of every
> segment using rte_mem_virt2iova(). This works for internal memory, but does
> not really work for external memory, and does not work on platforms which
> return RTE_BAD_IOVA as a result of this call (such as FreeBSD). Moreover, even
> when it works, the function in question will do unnecessary pagewalks in IOVA
> as PA mode, as it falls back to rte_mem_virt2phy() instead of just doing a lookup
> in internal memseg table.
>
> To fix it, replace the call to first attempt to look through the internal memseg
> table (this takes care of internal and external memory), and fall back to
> rte_mem_virt2iova() when unable to perform VA->IOVA translation via memseg
> table.
>
> Fixes: 66cc45e293ed ("mem: replace memseg with memseg lists")
> Cc: stable at dpdk.org
>
> Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
> ---
> lib/librte_mempool/rte_mempool.c | 17 +++++++++++++++--
> 1 file changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/lib/librte_mempool/rte_mempool.c
> b/lib/librte_mempool/rte_mempool.c
> index 40cae3eb67..8da2e471c7 100644
> --- a/lib/librte_mempool/rte_mempool.c
> +++ b/lib/librte_mempool/rte_mempool.c
> @@ -356,6 +356,19 @@ rte_mempool_populate_iova(struct rte_mempool *mp,
> char *vaddr,
> return ret;
> }
>
> +static rte_iova_t
> +get_iova(void *addr)
> +{
> + struct rte_memseg *ms;
> +
> + /* try registered memory first */
> + ms = rte_mem_virt2memseg(addr, NULL);
> + if (ms == NULL || ms->iova == RTE_BAD_IOVA)
> + /* fall back to actual physical address */
> + return rte_mem_virt2iova(addr);
> + return ms->iova + RTE_PTR_DIFF(addr, ms->addr); }
> +
> /* Populate the mempool with a virtual area. Return the number of
> * objects added, or a negative value on error.
> */
> @@ -375,7 +388,7 @@ rte_mempool_populate_virt(struct rte_mempool *mp,
> char *addr,
> for (off = 0; off < len &&
> mp->populated_size < mp->size; off += phys_len) {
>
> - iova = rte_mem_virt2iova(addr + off);
> + iova = get_iova(addr + off);
>
> if (iova == RTE_BAD_IOVA && rte_eal_has_hugepages()) {
> ret = -EINVAL;
> @@ -391,7 +404,7 @@ rte_mempool_populate_virt(struct rte_mempool *mp,
> char *addr,
> phys_len = RTE_MIN(phys_len + pg_sz, len - off)) {
> rte_iova_t iova_tmp;
>
> - iova_tmp = rte_mem_virt2iova(addr + off + phys_len);
> + iova_tmp = get_iova(addr + off + phys_len);
>
> if (iova_tmp == RTE_BAD_IOVA ||
> iova_tmp != iova + phys_len)
> --
> 2.17.1
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