leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

i40e: enable packet split only when IOMMU present

Browse Source 
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: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Jim Young <james.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Mitch Williams 2015-02-06 08:52:11 +00:00 committed by Jeff Kirsher
parent 0e888980a3
commit 2bc7ee8ac5
2 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/ethernet/intel/i40e/i40e.h
View File

@ -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>

8
drivers/net/ethernet/intel/i40e/i40e_main.c
View File

@ -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;