Re: [dpdk-dev] [PATCH 8/8] ipc: fix net/mlx5 memleak

[Yongseok Koh <yskoh@mellanox.com>]

> On Apr 17, 2019, at 7:44 AM, Herakliusz Lipiec <herakliusz.lipiec@intel.com> wrote:
> 
> When sending multiple requests, rte_mp_request_sync
> can succeed sending a few of those requests, but then
> fail on a later one and in the end return with rc=-1.
> The upper layers - e.g. device hotplug - currently
> handles this case as if no messages were sent and no
> memory for response buffers was allocated, which is
> not true. Fixed by always freeing reply message buffers.
> 
> Fixes: 9a8ab29b84d3 ("net/mlx5: replace IPC socket with EAL API")
> Fixes: c18cf501a7af ("net/mlx5: enable secondary process to register DMA memory")
> Cc: yskoh@mellanox.com
> Signed-off-by: Herakliusz Lipiec <herakliusz.lipiec@intel.com>
> ---
> drivers/net/mlx5/mlx5_mp.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/mlx5/mlx5_mp.c b/drivers/net/mlx5/mlx5_mp.c
> index cea74adb6..c9915b1d5 100644
> --- a/drivers/net/mlx5/mlx5_mp.c
> +++ b/drivers/net/mlx5/mlx5_mp.c
> @@ -258,6 +258,7 @@ mlx5_mp_req_mr_create(struct rte_eth_dev *dev, uintptr_t addr)
> 	if (ret) {
> 		DRV_LOG(ERR, "port %u request to primary process failed",
> 			dev->data->port_id);
> +		free(mp_rep.msgs);
> 		return -rte_errno;
> 	}
> 	assert(mp_rep.nb_received == 1);
> @@ -295,7 +296,8 @@ mlx5_mp_req_verbs_cmd_fd(struct rte_eth_dev *dev)
> 	if (ret) {
> 		DRV_LOG(ERR, "port %u request to primary process failed",
> 			dev->data->port_id);
> -		return -rte_errno;
> +		ret = -rte_errno;
> +		goto exit;

These two requests will be made by a secondary process targeting to the primary.
Then, there's only one request in this case and we don't need to take care of that.
Right?

Same comment for mlx4.

Thanks,
Yongseok

> 	}
> 	assert(mp_rep.nb_received == 1);
> 	mp_res = &mp_rep.msgs[0];
> -- 
> 2.17.2
>