netdev - Re: [PATCH 12/12] cxgb4: NUMA-aware Tx queue allocations

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Date:	Tue, 14 Dec 2010 22:17:59 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dimitris Michailidis <dm@...lsio.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 12/12] cxgb4: NUMA-aware Tx queue allocations

Le mardi 14 décembre 2010 à 12:18 -0800, Dimitris Michailidis a écrit :
> Allocate Tx queue memory on the node indicated by the new
> netdev_queue_numa_node_read.  If that fails we allocate on any node.
> 
> Signed-off-by: Dimitris Michailidis <dm@...lsio.com>
> ---
>  drivers/net/cxgb4/sge.c |   20 +++++++++++++-------
>  1 files changed, 13 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/cxgb4/sge.c b/drivers/net/cxgb4/sge.c
> index cc0b997..ed98b8a 100644
> --- a/drivers/net/cxgb4/sge.c
> +++ b/drivers/net/cxgb4/sge.c
> @@ -579,6 +579,7 @@ static inline void __refill_fl(struct adapter *adap, struct sge_fl *fl)
>   *	@phys: the physical address of the allocated ring
>   *	@metadata: address of the array holding the SW state for the ring
>   *	@stat_size: extra space in HW ring for status information
> + *	@node: preferred node for memory allocations
>   *
>   *	Allocates resources for an SGE descriptor ring, such as Tx queues,
>   *	free buffer lists, or response queues.  Each SGE ring requires
> @@ -590,7 +591,7 @@ static inline void __refill_fl(struct adapter *adap, struct sge_fl *fl)
>   */
>  static void *alloc_ring(struct device *dev, size_t nelem, size_t elem_size,
>  			size_t sw_size, dma_addr_t *phys, void *metadata,
> -			size_t stat_size)
> +			size_t stat_size, int node)
>  {
>  	size_t len = nelem * elem_size + stat_size;
>  	void *s = NULL;
> @@ -599,7 +600,10 @@ static void *alloc_ring(struct device *dev, size_t nelem, size_t elem_size,
>  	if (!p)
>  		return NULL;
>  	if (sw_size) {
> -		s = kcalloc(nelem, sw_size, GFP_KERNEL);
> +		if (node >= 0)
> +			s = kzalloc_node(nelem * sw_size, GFP_KERNEL, node);

kzalloc_node() has a fallback, you dont need to retry with kcalloc()

> +		if (!s)
> +			s = kcalloc(nelem, sw_size, GFP_KERNEL);
>  
>  		if (!s) {
>  			dma_free_coherent(dev, len, p, *phys);

Also, I am not sure it is going to work, since we can setup XPS only
after device being setup ?

By the time your driver allocates rings, we probably read
-1/NUMA_NO_NODE



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