A build error reported related to the selected 'get_user_pages_remote()'
kernel API:
.../kernel/linux/kni/kni_dev.h:113:8:
error: too few arguments to function ‘get_user_pages_remote’
ret = get_user_pages_remote(tsk, tsk->mm, iova, 1
^~~~~~~~~~~~~~~~~~~~~
Currently there are three versions of the 'get_user_pages_remote()'
supported, based on kernel version < 4.9, = 4.9, > 4.9.
These version based checks are not working fine with the distro kernels
which is the cause of reported build error. The error reported by the
kernel version 4.8, but it is using API defined in > 4.9.
To be able to take control of this, and possible more, related build
error, increasing the minimum supported kernel version for iova=va with
KNI to kernel version 4.9.
This leaves us with single version of the kernel API and more manageable.
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>
KNI operates in IOVA_VA scheme when
KNI operates in IOVA_VA scheme when
-- LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0) and
+- LINUX_VERSION_CODE > KERNEL_VERSION(4, 9, 0) and
- EAL option `iova-mode=va` is passed or bus IOVA scheme in the DPDK is selected
as RTE_IOVA_VA.
- EAL option `iova-mode=va` is passed or bus IOVA scheme in the DPDK is selected
as RTE_IOVA_VA.
* Added IOVA = VA support for KNI, KNI can operate in IOVA = VA mode when
`iova-mode=va` EAL option is passed to the application or when bus IOVA
scheme is selected as RTE_IOVA_VA. This mode only works on Linux Kernel
* Added IOVA = VA support for KNI, KNI can operate in IOVA = VA mode when
`iova-mode=va` EAL option is passed to the application or when bus IOVA
scheme is selected as RTE_IOVA_VA. This mode only works on Linux Kernel
- versions 4.6.0 and above.
* Due to IOVA to KVA address translations, based on the KNI use case there
can be a performance impact. For mitigation, forcing IOVA to PA via EAL
* Due to IOVA to KVA address translations, based on the KNI use case there
can be a performance impact. For mitigation, forcing IOVA to PA via EAL
#define HAVE_SIGNAL_FUNCTIONS_OWN_HEADER
#endif
#define HAVE_SIGNAL_FUNCTIONS_OWN_HEADER
#endif
-#if KERNEL_VERSION(4, 6, 0) <= LINUX_VERSION_CODE
-
+/*
+ * iova to kva mapping support can be provided since 4.6.0, but required
+ * kernel version increased to > 4.9.0 because of the updates in
+ * get_user_pages_remote() kernel API
+ */
+#if KERNEL_VERSION(4, 9, 0) < LINUX_VERSION_CODE
#define HAVE_IOVA_TO_KVA_MAPPING_SUPPORT
#define HAVE_IOVA_TO_KVA_MAPPING_SUPPORT
-
-#if KERNEL_VERSION(4, 9, 0) > LINUX_VERSION_CODE
-#define GET_USER_PAGES_REMOTE_API_V1
-#elif KERNEL_VERSION(4, 9, 0) == LINUX_VERSION_CODE
-#define GET_USER_PAGES_REMOTE_API_V2
-#else
-#define GET_USER_PAGES_REMOTE_API_V3
-#endif
-
offset = iova & (PAGE_SIZE - 1);
/* Read one page struct info */
offset = iova & (PAGE_SIZE - 1);
/* Read one page struct info */
-#ifdef GET_USER_PAGES_REMOTE_API_V3
ret = get_user_pages_remote(tsk, tsk->mm, iova, 1,
FOLL_TOUCH, &page, NULL, NULL);
ret = get_user_pages_remote(tsk, tsk->mm, iova, 1,
FOLL_TOUCH, &page, NULL, NULL);
-#endif
-#ifdef GET_USER_PAGES_REMOTE_API_V2
- ret = get_user_pages_remote(tsk, tsk->mm, iova, 1,
- FOLL_TOUCH, &page, NULL);
-#endif
-#ifdef GET_USER_PAGES_REMOTE_API_V1
- ret = get_user_pages_remote(tsk, tsk->mm, iova, 1
- 0, 0, &page, NULL);
-#endif
*/
iova_mode = RTE_IOVA_VA;
RTE_LOG(DEBUG, EAL, "Physical addresses are unavailable, selecting IOVA as VA mode.\n");
*/
iova_mode = RTE_IOVA_VA;
RTE_LOG(DEBUG, EAL, "Physical addresses are unavailable, selecting IOVA as VA mode.\n");
-#if defined(RTE_LIBRTE_KNI) && LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0)
+#if defined(RTE_LIBRTE_KNI) && LINUX_VERSION_CODE > KERNEL_VERSION(4, 9, 0)
} else if (rte_eal_check_module("rte_kni") == 1) {
iova_mode = RTE_IOVA_PA;
RTE_LOG(DEBUG, EAL, "KNI is loaded, selecting IOVA as PA mode for better KNI perfomance.\n");
} else if (rte_eal_check_module("rte_kni") == 1) {
iova_mode = RTE_IOVA_PA;
RTE_LOG(DEBUG, EAL, "KNI is loaded, selecting IOVA as PA mode for better KNI perfomance.\n");
RTE_LOG(DEBUG, EAL, "IOMMU is not available, selecting IOVA as PA mode.\n");
}
}
RTE_LOG(DEBUG, EAL, "IOMMU is not available, selecting IOVA as PA mode.\n");
}
}
-#if defined(RTE_LIBRTE_KNI) && LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0)
+#if defined(RTE_LIBRTE_KNI) && LINUX_VERSION_CODE <= KERNEL_VERSION(4, 9, 0)
/* Workaround for KNI which requires physical address to work
/* Workaround for KNI which requires physical address to work
*/
if (iova_mode == RTE_IOVA_VA &&
rte_eal_check_module("rte_kni") == 1) {
*/
if (iova_mode == RTE_IOVA_VA &&
rte_eal_check_module("rte_kni") == 1) {
int
rte_kni_init(unsigned int max_kni_ifaces __rte_unused)
{
int
rte_kni_init(unsigned int max_kni_ifaces __rte_unused)
{
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0)
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(4, 9, 0)
if (rte_eal_iova_mode() != RTE_IOVA_PA) {
RTE_LOG(ERR, KNI, "KNI requires IOVA as PA\n");
return -1;
if (rte_eal_iova_mode() != RTE_IOVA_PA) {
RTE_LOG(ERR, KNI, "KNI requires IOVA as PA\n");
return -1;