From d965af9e8ae164aec5912ebd767132ab56a58adb Mon Sep 17 00:00:00 2001 From: Ferruh Yigit Date: Wed, 20 Nov 2019 17:22:26 +0000 Subject: [PATCH] kni: increase kernel version requirement for VA MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: David Marchand --- doc/guides/prog_guide/kernel_nic_interface.rst | 2 +- doc/guides/rel_notes/release_19_11.rst | 2 +- kernel/linux/kni/compat.h | 17 ++++++----------- kernel/linux/kni/kni_dev.h | 10 ---------- lib/librte_eal/linux/eal/eal.c | 6 +++--- lib/librte_kni/rte_kni.c | 2 +- 6 files changed, 12 insertions(+), 27 deletions(-) diff --git a/doc/guides/prog_guide/kernel_nic_interface.rst b/doc/guides/prog_guide/kernel_nic_interface.rst index c4479ffbf7..848b00253e 100644 --- a/doc/guides/prog_guide/kernel_nic_interface.rst +++ b/doc/guides/prog_guide/kernel_nic_interface.rst @@ -305,7 +305,7 @@ IOVA = VA: Support 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. diff --git a/doc/guides/rel_notes/release_19_11.rst b/doc/guides/rel_notes/release_19_11.rst index 93243a7d36..48c80e5da7 100644 --- a/doc/guides/rel_notes/release_19_11.rst +++ b/doc/guides/rel_notes/release_19_11.rst @@ -308,7 +308,7 @@ New Features * 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. + versions above 4.9.0. * 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 diff --git a/kernel/linux/kni/compat.h b/kernel/linux/kni/compat.h index 062b170efe..83ecac2d8c 100644 --- a/kernel/linux/kni/compat.h +++ b/kernel/linux/kni/compat.h @@ -122,16 +122,11 @@ #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 - -#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 - #endif diff --git a/kernel/linux/kni/kni_dev.h b/kernel/linux/kni/kni_dev.h index fb641b696f..5e75c6371f 100644 --- a/kernel/linux/kni/kni_dev.h +++ b/kernel/linux/kni/kni_dev.h @@ -101,18 +101,8 @@ static inline phys_addr_t iova_to_phys(struct task_struct *tsk, 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); -#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 if (ret < 0) return 0; diff --git a/lib/librte_eal/linux/eal/eal.c b/lib/librte_eal/linux/eal/eal.c index b5b71500c3..5879e33e56 100644 --- a/lib/librte_eal/linux/eal/eal.c +++ b/lib/librte_eal/linux/eal/eal.c @@ -1073,7 +1073,7 @@ rte_eal_init(int argc, char **argv) */ 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"); @@ -1090,9 +1090,9 @@ rte_eal_init(int argc, char **argv) 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 - * in kernels < 4.6 + * in kernels <= 4.9 */ if (iova_mode == RTE_IOVA_VA && rte_eal_check_module("rte_kni") == 1) { diff --git a/lib/librte_kni/rte_kni.c b/lib/librte_kni/rte_kni.c index 86995fc817..b564482fe4 100644 --- a/lib/librte_kni/rte_kni.c +++ b/lib/librte_kni/rte_kni.c @@ -98,7 +98,7 @@ static volatile int kni_fd = -1; 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; -- 2.20.1