patches for DPDK stable branches
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From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: wangyunjian <wangyunjian@huawei.com>,
	dev@dpdk.org, david.marchand@redhat.com
Cc: jerry.lilijun@huawei.com, xudingke@huawei.com, stable@dpdk.org
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH 1/1] eal/linux: do not create user mem map repeatedly when it exists
Date: Fri, 17 Jul 2020 15:19:41 +0100	[thread overview]
Message-ID: <70169443-f475-a632-c1f8-6e993bea726c@intel.com> (raw)
In-Reply-To: <cdb0d6482a5c3a5d7d23625d230d9ef41d657320.1594903876.git.wangyunjian@huawei.com>

On 16-Jul-20 2:38 PM, wangyunjian wrote:
> From: Yunjian Wang <wangyunjian@huawei.com>
> 
> Currently, we will create new user mem map entry for the same memory
> segment, but in fact it has already been added to the user mem maps.
> It's not necessary to create it twice.
> 
> Fixes: 0cbce3a167f1 ("vfio: skip DMA map failure if already mapped")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
> ---
>   lib/librte_eal/linux/eal_vfio.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/lib/librte_eal/linux/eal_vfio.c b/lib/librte_eal/linux/eal_vfio.c
> index abb12a354..d8a8c39ab 100644
> --- a/lib/librte_eal/linux/eal_vfio.c
> +++ b/lib/librte_eal/linux/eal_vfio.c
> @@ -1828,6 +1828,13 @@ container_dma_map(struct vfio_config *vfio_cfg, uint64_t vaddr, uint64_t iova,
>   		ret = -1;
>   		goto out;
>   	}
> +
> +	/* we don't need create new user mem map entry
> +	 * for the same memory segment.
> +	 */
> +	if (errno == EBUSY || errno == EEXIST)
> +		goto out;
> +

I'm not sure i understand this patch. If we get errno, the call has 
failed, which means we're doing "goto out" from a few lines above. Am i 
missing something here?

>   	/* create new user mem map entry */
>   	new_map = &user_mem_maps->maps[user_mem_maps->n_maps++];
>   	new_map->addr = vaddr;
> 


-- 
Thanks,
Anatoly

  reply	other threads:[~2020-07-17 14:19 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-16 13:38 [dpdk-stable] " wangyunjian
2020-07-17 14:19 ` Burakov, Anatoly [this message]
2020-07-17 14:23   ` [dpdk-stable] [dpdk-dev] " Burakov, Anatoly
2020-07-20  2:00     ` wangyunjian
2020-07-20 11:46       ` Burakov, Anatoly
2020-07-22 12:47         ` wangyunjian
2020-07-23 14:48 ` [dpdk-stable] [dpdk-dev] [PATCH v2] " wangyunjian
2020-07-24 13:25   ` Burakov, Anatoly
2020-07-25  9:59     ` wangyunjian
2020-07-27  9:24       ` Burakov, Anatoly
2020-07-30 13:16         ` wangyunjian
2020-07-31 11:55           ` Burakov, Anatoly
2020-08-05 12:58             ` wangyunjian
2020-09-17 11:33               ` Burakov, Anatoly
2020-09-17 11:35   ` Burakov, Anatoly
2020-10-15 12:46     ` wangyunjian
2020-10-15 12:54       ` David Marchand
2020-10-16  9:48         ` wangyunjian
2020-10-16  9:28   ` [dpdk-stable] [dpdk-dev] [PATCH v3] eal: fix " wangyunjian
2020-10-20 14:09     ` Thomas Monjalon
2020-11-15 14:23       ` Thomas Monjalon
2020-11-22 18:20         ` Thomas Monjalon
2020-11-23  7:40           ` wangyunjian
2020-11-27 12:54       ` Burakov, Anatoly
2020-12-07 11:08     ` [dpdk-stable] [dpdk-dev] [PATCH v4] " wangyunjian
2021-03-25 13:38       ` wangyunjian
2021-03-25 14:30       ` Thomas Monjalon
2021-03-25 16:45         ` Kevin Traynor
2021-04-10  9:37     ` [dpdk-stable] [dpdk-dev] [PATCH v5] " wangyunjian
2021-04-19 11:47       ` Thomas Monjalon

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