/* * Copyright (c) 2017 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <linux/vfio.h> #include <sys/ioctl.h> #include <vnet/vnet.h> #include <vnet/plugin/plugin.h> #include <dpdk/device/dpdk.h> #include <vpp/app/version.h> /* * Called by the dpdk driver's rte_delay_us() function. * Return 0 to have the dpdk do a regular delay loop. * Return 1 if to skip the delay loop because we are suspending * the calling vlib process instead. */ static int rte_delay_us_override (unsigned us) { vlib_main_t *vm; /* Don't bother intercepting for short delays */ if (us < 10) return 0; /* * Only intercept if we are in a vlib process. * If we are called from a vlib worker thread or the vlib main * thread then do not intercept. (Must not be called from an * independent pthread). */ if (vlib_get_thread_index () == 0) { /* * We're in the vlib main thread or a vlib process. Make sure * the process is running and we're not still initializing. */ vm = vlib_get_main (); if (vlib_in_process_context (vm)) { /* Only suspend for the admin_down_process */ vlib_process_t *proc = vlib_get_current_process (vm); if (!(proc->flags & VLIB_PROCESS_IS_RUNNING) || (proc->node_runtime.function != admin_up_down_process)) return 0; f64 delay = 1e-6 * us; vlib_process_suspend (vm, delay); return 1; } } return 0; // no override } static void rte_delay_us_override_cb (unsigned us) { if (rte_delay_us_override (us) == 0) rte_delay_us_block (us); } static clib_error_t * dpdk_main_init (vlib_main_t * vm) { dpdk_main_t * dm = &dpdk_main; clib_error_t * error = 0; dm->vlib_main = vm; dm->vnet_main = vnet_get_main (); if ((error = vlib_call_init_function (vm, dpdk_init))) return error; /* register custom delay function */ rte_delay_us_callback_register (rte_delay_us_override_cb); return error; } VLIB_INIT_FUNCTION (dpdk_main_init); clib_error_t * dpdk_early_init (vlib_main_t *vm) { int fd = -1; u64 *pt = 0; clib_error_t *err = 0; clib_mem_vm_alloc_t alloc = { 0 }; /* check if pagemap is accessible - if we get zero result dpdk will not be able to get physical memory address and game is over unless we have IOMMU */ pt = clib_mem_vm_get_paddr (&pt, min_log2 (sysconf (_SC_PAGESIZE)), 1); if (pt && pt[0]) goto check_hugetlb; if ((fd = open ("/dev/vfio/vfio", O_RDWR)) == -1) goto error; if (ioctl (fd, VFIO_GET_API_VERSION) != VFIO_API_VERSION) goto error; /* if we have type 1 IOMMU page map is not needed */ if (ioctl (fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU) != 1) goto error; check_hugetlb: alloc.flags = CLIB_MEM_VM_F_SHARED | CLIB_MEM_VM_F_HUGETLB | CLIB_MEM_VM_F_HUGETLB_PREALLOC; alloc.size = 1; if ((err = clib_mem_vm_ext_alloc (&alloc))) { clib_error_free (err); goto error; } else clib_mem_vm_free (alloc.addr, 1 << alloc.log2_page_size); goto done; error: err = clib_error_return (0, "access to physical devices is not allowed"); done: if (fd != -1) close (fd); vec_free (pt); return err; } /* *INDENT-OFF* */ VLIB_PLUGIN_REGISTER () = { .version = VPP_BUILD_VER, .description = "Data Plane Development Kit (DPDK)", .early_init = "dpdk_early_init", }; /* *INDENT-ON* */