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vfio: fix build on Linux < 4.2

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The commit db90b4969e ("vfio: retry creating sPAPR DMA window")
introduced a build breakage on old Linux. Linux <4.2 does not define ddw in
struct vfio_iommu_spapr_tce_info. Without ddw, we cannot change window size
and so should give up the creation. I just exculuded the retrying code if
ddw is not supported.

Fixes: db90b4969e ("vfio: retry creating sPAPR DMA window")

Signed-off-by: Takeshi Yoshimura <tyos@jp.ibm.com>
Tested-by: Anatoly Burakov <anatoly.burakov@intel.com>
This commit is contained in:
Takeshi Yoshimura 2019-07-10 19:22:35 -07:00 committed by Thomas Monjalon
parent a99a311ba1
commit 22a55d2eb6
1 changed files with 2 additions and 0 deletions
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lib/librte_eal/linux/eal/eal_vfio.c
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@ -1445,6 +1445,7 @@ vfio_spapr_create_new_dma_window(int vfio_container_fd,
/* create new DMA window */
ret = ioctl(vfio_container_fd, VFIO_IOMMU_SPAPR_TCE_CREATE, create);
if (ret) {
#ifdef VFIO_IOMMU_SPAPR_INFO_DDW
/* try possible page_shift and levels for workaround */
uint32_t levels;
@ -1463,6 +1464,7 @@ vfio_spapr_create_new_dma_window(int vfio_container_fd,
if (!ret)
break;
}
#endif
if (ret) {
RTE_LOG(ERR, EAL, " cannot create new DMA window, "
"error %i (%s)\n", errno, strerror(errno));