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Commit 2bc7ee8a authored by Mitch Williams's avatar Mitch Williams Committed by Jeff Kirsher
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i40e: enable packet split only when IOMMU present 



When an IOMMU is in use, the packet split receive path shows a distinct
advantage over the single-buffer path because it minimizes DMA mapping
and unmapping. However, this is not an advantage for systems with no
IOMMU. At init time, check to see if an IOMMU is enabled and enable
packet split receives.

Change-ID: I4f70d2e9c31bbea3dc8fd0c5734959a6e6602210
Signed-off-by: default avatarMitch Williams <mitch.a.williams@intel.com>
Tested-by: default avatarJim Young <james.m.young@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 0e888980

drivers/net/ethernet/intel/i40e/i40e.h

+1 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ 
#include <linux/aer.h>

#include <linux/netdevice.h>

#include <linux/ioport.h>

#include <linux/iommu.h>

#include <linux/slab.h>

#include <linux/list.h>

#include <linux/string.h>

drivers/net/ethernet/intel/i40e/i40e_main.c

+6 −2
Original line number Diff line number Diff line
@@ -7279,8 +7279,12 @@ static int i40e_sw_init(struct i40e_pf *pf) 
	/* Set default capability flags */

	pf->flags = I40E_FLAG_RX_CSUM_ENABLED |

		    I40E_FLAG_MSI_ENABLED     |

		    I40E_FLAG_MSIX_ENABLED    |

		    I40E_FLAG_RX_PS_ENABLED;

		    I40E_FLAG_MSIX_ENABLED;



	if (iommu_present(&pci_bus_type))

		pf->flags |= I40E_FLAG_RX_PS_ENABLED;

	else

		pf->flags |= I40E_FLAG_RX_1BUF_ENABLED;



	/* Set default ITR */

	pf->rx_itr_default = I40E_ITR_DYNAMIC | I40E_ITR_RX_DEF;