forked from luck/tmp_suning_uos_patched
I/OAT: tcp_dma_copybreak default value dependent on I/OAT version
I/OAT DMA performance tuning showed different optimal values of tcp_dma_copybreak for different I/OAT versions (4096 for 1.2 and 2048 for 2.0). This patch lets ioatdma driver set tcp_dma_copybreak value according to these results. [dan.j.williams@intel.com: remove some ifdefs] Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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@ -1581,6 +1581,8 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,
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if (err)
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goto err_self_test;
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ioat_set_tcp_copy_break(device);
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dma_async_device_register(&device->common);
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INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog);
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@ -27,6 +27,7 @@
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#include <linux/dmapool.h>
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#include <linux/cache.h>
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#include <linux/pci_ids.h>
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#include <net/tcp.h>
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#define IOAT_DMA_VERSION "2.18"
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@ -129,6 +130,20 @@ struct ioat_desc_sw {
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struct dma_async_tx_descriptor async_tx;
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};
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static inline void ioat_set_tcp_copy_break(struct ioatdma_device *dev)
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{
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#ifdef CONFIG_NET_DMA
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switch (dev->version) {
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case IOAT_VER_1_2:
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sysctl_tcp_dma_copybreak = 4096;
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break;
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case IOAT_VER_2_0:
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sysctl_tcp_dma_copybreak = 2048;
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break;
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}
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#endif
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}
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#if defined(CONFIG_INTEL_IOATDMA) || defined(CONFIG_INTEL_IOATDMA_MODULE)
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struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,
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void __iomem *iobase);
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@ -34,6 +34,7 @@
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#define NET_DMA_DEFAULT_COPYBREAK 4096
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int sysctl_tcp_dma_copybreak = NET_DMA_DEFAULT_COPYBREAK;
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EXPORT_SYMBOL(sysctl_tcp_dma_copybreak);
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/**
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* dma_skb_copy_datagram_iovec - Copy a datagram to an iovec.
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