[dpdk-stable] [PATCH] bus/pci: fix selection of default device NUMA node

[Olivier Matz]

On Tue, Oct 26, 2021 at 11:06:10AM +0200, Houssem Bouhlel wrote:
> There can be dev binding issue when no hugepages
> are allocated for socket 0.
> To avoid this, set device numa node value based on
> the first lcore instead of 0.
> 
> Fixes: 831dba47bd36 ("bus/vmbus: add Hyper-V virtual bus support")

Sorry, the Fixes line is wrong. This is the correct one:
Fixes: 8a04cb612589 ("pci: set default numa node for broken systems")

> Cc: stable at dpdk.org
> 
> Signed-off-by: Houssem Bouhlel <houssem.bouhlel at 6wind.com>
> Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
> ---
>  drivers/bus/pci/pci_common.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/pci/pci_common.c b/drivers/bus/pci/pci_common.c
> index f8fff2c98ebf..c70ab2373c79 100644
> --- a/drivers/bus/pci/pci_common.c
> +++ b/drivers/bus/pci/pci_common.c
> @@ -166,6 +166,7 @@ rte_pci_probe_one_driver(struct rte_pci_driver *dr,
>  			 struct rte_pci_device *dev)
>  {
>  	int ret;
> +	unsigned int socket_id;
>  	bool already_probed;
>  	struct rte_pci_addr *loc;
>  
> @@ -194,7 +195,8 @@ rte_pci_probe_one_driver(struct rte_pci_driver *dr,
>  		if (rte_socket_count() > 1)
>  			RTE_LOG(INFO, EAL, "Device %s is not NUMA-aware, defaulting socket to 0\n",
>  					dev->name);

One more comment (sorry, I should have done it before you send the mail):
We should move this log below, and use the socket_id instead of 0.

> -		dev->device.numa_node = 0;
> +		socket_id = rte_lcore_to_socket_id(rte_get_next_lcore(-1, 0, 0));
> +		dev->device.numa_node = socket_id;
>  	}
>  
>  	already_probed = rte_dev_is_probed(&dev->device);
> -- 
> 2.30.2
>