netdev - Re: [PATCH v2 net-next 17/19] ionic: Add RSS support

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Date:   Sat, 29 Jun 2019 11:48:39 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Shannon Nelson <snelson@...sando.io>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next 17/19] ionic: Add RSS support

On Fri, 28 Jun 2019 14:39:32 -0700, Shannon Nelson wrote:
> @@ -1260,10 +1266,24 @@ static struct lif *ionic_lif_alloc(struct ionic *ionic, unsigned int index)
>  	if (err)
>  		goto err_out_free_lif_info;
>  
> +	/* allocate rss indirection table */
> +	tbl_sz = le16_to_cpu(lif->ionic->ident.lif.eth.rss_ind_tbl_sz);
> +	lif->rss_ind_tbl_sz = sizeof(*lif->rss_ind_tbl) * tbl_sz;
> +	lif->rss_ind_tbl = dma_alloc_coherent(dev, lif->rss_ind_tbl_sz,
> +					      &lif->rss_ind_tbl_pa,
> +					      GFP_KERNEL);
> +
> +	if (!lif->rss_ind_tbl) {
> +		dev_err(dev, "Failed to allocate rss indirection table, aborting\n");
> +		goto err_out_free_qcqs;
> +	}
> +
>  	list_add_tail(&lif->list, &ionic->lifs);
>  
>  	return lif;
>  
> +err_out_free_qcqs:
> +	ionic_qcqs_free(lif);
>  err_out_free_lif_info:
>  	dma_free_coherent(dev, lif->info_sz, lif->info, lif->info_pa);
>  	lif->info = NULL;
> @@ -1302,6 +1322,14 @@ static void ionic_lif_free(struct lif *lif)
>  {
>  	struct device *dev = lif->ionic->dev;
>  
> +	/* free rss indirection table */
> +	if (lif->rss_ind_tbl) {
> +		dma_free_coherent(dev, lif->rss_ind_tbl_sz, lif->rss_ind_tbl,
> +				  lif->rss_ind_tbl_pa);

dma_free_coherent() should be able to deal with NULLs just fine.
Besides you fail hard if the allocation failed, no?

> +		lif->rss_ind_tbl = NULL;
> +		lif->rss_ind_tbl_pa = 0;
> +	}