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Date: Mon, 23 Sep 2019 11:59:15 +0200 From: Thierry Reding <thierry.reding@...il.com> To: "David S . Miller" <davem@...emloft.net> Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>, Alexandre Torgue <alexandre.torgue@...com>, Jose Abreu <joabreu@...opsys.com>, Florian Fainelli <f.fainelli@...il.com>, Jakub Kicinski <jakub.kicinski@...ronome.com>, Jon Hunter <jonathanh@...dia.com>, Bitan Biswas <bbiswas@...dia.com>, netdev@...r.kernel.org, linux-tegra@...r.kernel.org Subject: [PATCH net-next] net: stmmac: Fix page pool size From: Thierry Reding <treding@...dia.com> The size of individual pages in the page pool in given by an order. The order is the binary logarithm of the number of pages that make up one of the pages in the pool. However, the driver currently passes the number of pages rather than the order, so it ends up wasting quite a bit of memory. Fix this by taking the binary logarithm and passing that in the order field. Fixes: 2af6106ae949 ("net: stmmac: Introducing support for Page Pool") Signed-off-by: Thierry Reding <treding@...dia.com> --- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index ecd461207dbc..f8c90dba6db8 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -1550,13 +1550,15 @@ static int alloc_dma_rx_desc_resources(struct stmmac_priv *priv) for (queue = 0; queue < rx_count; queue++) { struct stmmac_rx_queue *rx_q = &priv->rx_queue[queue]; struct page_pool_params pp_params = { 0 }; + unsigned int num_pages; rx_q->queue_index = queue; rx_q->priv_data = priv; pp_params.flags = PP_FLAG_DMA_MAP; pp_params.pool_size = DMA_RX_SIZE; - pp_params.order = DIV_ROUND_UP(priv->dma_buf_sz, PAGE_SIZE); + num_pages = DIV_ROUND_UP(priv->dma_buf_sz, PAGE_SIZE); + pp_params.order = ilog2(num_pages); pp_params.nid = dev_to_node(priv->device); pp_params.dev = priv->device; pp_params.dma_dir = DMA_FROM_DEVICE; -- 2.23.0
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