Re: multipath IB/srp fail-over testing lands up in dump stack in swiotlb_alloc_coherent()

[Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

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On Sun, Jun 12, 2016 at 11:32:53PM -0700, Bart Van Assche wrote:
> On 06/12/2016 03:40 PM, Laurence Oberman wrote:
> >Jun  8 10:12:52 jumpclient kernel: mlx5_core 0000:08:00.1: swiotlb buffer is full (sz: 266240 bytes)
> >Jun  8 10:12:52 jumpclient kernel: swiotlb: coherent allocation failed for device 0000:08:00.1 size=266240
> 
> Hello,
> 
> I think the above means that the coherent memory allocation succeeded but
> that the test dev_addr + size - 1 <= DMA_BIT_MASK(32) failed. Can someone
> from Mellanox tell us whether or not it would be safe to set
> coherent_dma_mask to DMA_BIT_MASK(64) for the mlx4 and mlx5 drivers?

Bart and Laurence,
We are actually doing it For mlx5 driver.

926 static int mlx5_pci_init(struct mlx5_core_dev *dev, struct  mlx5_priv *priv)
<...>
961         err = set_dma_caps(pdev);

187 static int set_dma_caps(struct pci_dev *pdev)
<...>
201         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
202         if (err) {
203                 dev_warn(&pdev->dev,
204                          "Warning: couldn't set 64-bit consistent PCI DMA mask\n");
205                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
206                 if (err) {
207                         dev_err(&pdev->dev,
208                                 "Can't set consistent PCI DMA mask, aborting\n");
209                         return err;
210                 }
211         }

118 static inline int pci_set_consistent_dma_mask(struct pci_dev *dev,u64 mask)
119 {
120         return dma_set_coherent_mask(&dev->dev, mask);
121 }

> 
> Thanks,
> 
> Bart.
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