vmxnet3: auto bind support - vpp - Vector Packet Processing

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author	Steven Luong <sluong@cisco.com>	2019-03-14 09:57:09 -0700
committer	Damjan Marion <dmarion@me.com>	2019-03-18 11:11:50 +0000
commit	ee8ba6877efb916b88255821f94ef33437724f75 (patch)
tree	aeb507c38ba53a60791c7084f6f47d540608971f /src/plugins/vmxnet3/README.md
parent	a990a2e4930014f025338d8ce186abfa12ec09ff (diff)

vmxnet3: auto bind support

For creating the vmxnet3 interface, add the bind option to automatically bind the pci to vfio-pci module which removes the need for manual bind. Manual bind still works, should people prefer to go that route. Change-Id: Ife75926f8755d754a08dd0ecff0f1de326ad5ba1 Signed-off-by: Steven Luong <sluong@cisco.com>

Diffstat (limited to 'src/plugins/vmxnet3/README.md')

-rw-r--r--

src/plugins/vmxnet3/README.md

1 files changed, 14 insertions, 7 deletions

/* * Copyright (c) 2016 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 <vnet/vnet.h> #include <vppinfra/xxhash.h> #include <vlib/threads.h> #include <vnet/handoff.h> #include <vnet/feature/feature.h> typedef struct { uword *workers_bitmap; u32 *workers; } per_inteface_handoff_data_t; typedef struct { u32 cached_next_index; u32 num_workers; u32 first_worker_index; per_inteface_handoff_data_t *if_data; /* Worker handoff index */ u32 frame_queue_index; /* convenience variables */ vlib_main_t *vlib_main; vnet_main_t *vnet_main; u64 (*hash_fn) (ethernet_header_t *); } handoff_main_t; handoff_main_t handoff_main; vlib_node_registration_t handoff_dispatch_node; typedef struct { u32 sw_if_index; u32 next_worker_index; u32 buffer_index; } worker_handoff_trace_t; /* packet trace format function */ static u8 * format_worker_handoff_trace (u8 * s, va_list * args) { CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); worker_handoff_trace_t *t = va_arg (*args, worker_handoff_trace_t *); s = format (s, "worker-handoff: sw_if_index %d, next_worker %d, buffer 0x%x", t->sw_if_index, t->next_worker_index, t->buffer_index); return s; } vlib_node_registration_t handoff_node; static uword worker_handoff_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { handoff_main_t *hm = &handoff_main; vlib_thread_main_t *tm = vlib_get_thread_main (); u32 n_left_from, *from; static __thread vlib_frame_queue_elt_t **handoff_queue_elt_by_worker_index; static __thread vlib_frame_queue_t **congested_handoff_queue_by_worker_index = 0; vlib_frame_queue_elt_t *hf = 0; int i; u32 n_left_to_next_worker = 0, *to_next_worker = 0; u32 next_worker_index = 0; u32 current_worker_index = ~0; if (PREDICT_FALSE (handoff_queue_elt_by_worker_index == 0)) { vec_validate (handoff_queue_elt_by_worker_index, tm->n_vlib_mains - 1); vec_validate_init_empty (congested_handoff_queue_by_worker_index, hm->first_worker_index + hm->num_workers - 1, (vlib_frame_queue_t *) (~0)); } from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; while (n_left_from > 0) { u32 bi0; vlib_buffer_t *b0; u32 sw_if_index0; u32 hash; u64 hash_key; per_inteface_handoff_data_t *ihd0; u32 index0; bi0 = from[0]; from += 1; n_left_from -= 1; b0 = vlib_get_buffer (vm, bi0); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; ASSERT (hm->if_data); ihd0 = vec_elt_at_index (hm->if_data, sw_if_index0); next_worker_index = hm->first_worker_index; /* * Force unknown traffic onto worker 0, * and into ethernet-input. $$$$ add more hashes. */ /* Compute ingress LB hash */ hash_key = hm->hash_fn ((ethernet_header_t *) b0->data); hash = (u32) clib_xxhash (hash_key); /* if input node did not specify next index, then packet should go to eternet-input */ if (PREDICT_FALSE ((b0->flags & VNET_BUFFER_F_HANDOFF_NEXT_VALID) == 0)) vnet_buffer (b0)->handoff.next_index = HANDOFF_DISPATCH_NEXT_ETHERNET_INPUT; else if (vnet_buffer (b0)->handoff.next_index == HANDOFF_DISPATCH_NEXT_IP4_INPUT || vnet_buffer (b0)->handoff.next_index == HANDOFF_DISPATCH_NEXT_IP6_INPUT || vnet_buffer (b0)->handoff.next_index == HANDOFF_DISPATCH_NEXT_MPLS_INPUT) vlib_buffer_advance (b0, (sizeof (ethernet_header_t))); if (PREDICT_TRUE (is_pow2 (vec_len (ihd0->workers)))) index0 = hash & (vec_len (ihd0->workers) - 1); else index0 = hash % vec_len (ihd0->workers); next_worker_index += ihd0->workers[index0]; if (next_worker_index != current_worker_index) { if (hf) hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker; hf = vlib_get_worker_handoff_queue_elt (hm->frame_queue_index, next_worker_index, handoff_queue_elt_by_worker_index); n_left_to_next_worker = VLIB_FRAME_SIZE - hf->n_vectors; to_next_worker = &hf->buffer_index[hf->n_vectors]; current_worker_index = next_worker_index; } /* enqueue to correct worker thread */ to_next_worker[0] = bi0; to_next_worker++; n_left_to_next_worker--; if (n_left_to_next_worker == 0) { hf->n_vectors = VLIB_FRAME_SIZE; vlib_put_frame_queue_elt (hf); current_worker_index = ~0; handoff_queue_elt_by_worker_index[next_worker_index] = 0; hf = 0; } if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { worker_handoff_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->sw_if_index = sw_if_index0; t->next_worker_index = next_worker_index - hm->first_worker_index; t->buffer_index = bi0; } } if (hf) hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker; /* Ship frames to the worker nodes */ for (i = 0; i < vec_len (handoff_queue_elt_by_worker_index); i++) { if (handoff_queue_elt_by_worker_index[i]) { hf = handoff_queue_elt_by_worker_index[i]; /* * It works better to let the handoff node * rate-adapt, always ship the handoff queue element. */ if (1 || hf->n_vectors == hf->last_n_vectors) { vlib_put_frame_queue_elt (hf); handoff_queue_elt_by_worker_index[i] = 0; } else hf->last_n_vectors = hf->n_vectors; } congested_handoff_queue_by_worker_index[i] = (vlib_frame_queue_t *) (~0); } hf = 0; current_worker_index = ~0; return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (worker_handoff_node) = { .function = worker_handoff_node_fn, .name = "worker-handoff", .vector_size = sizeof (u32), .format_trace = format_worker_handoff_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_next_nodes = 1, .next_nodes = { [0] = "error-drop", }, }; VLIB_NODE_FUNCTION_MULTIARCH (worker_handoff_node, worker_handoff_node_fn) /* *INDENT-ON* */ int interface_handoff_enable_disable (vlib_main_t * vm, u32 sw_if_index, uword * bitmap, int enable_disable) { handoff_main_t *hm = &handoff_main; vnet_sw_interface_t *sw; vnet_main_t *vnm = vnet_get_main (); per_inteface_handoff_data_t *d; int i, rv = 0; if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index)) return VNET_API_ERROR_INVALID_SW_IF_INDEX; sw = vnet_get_sw_interface (vnm, sw_if_index); if (sw->type != VNET_SW_INTERFACE_TYPE_HARDWARE) return VNET_API_ERROR_INVALID_SW_IF_INDEX; if (clib_bitmap_last_set (bitmap) >= hm->num_workers) return VNET_API_ERROR_INVALID_WORKER; if (hm->frame_queue_index == ~0) hm->frame_queue_index = vlib_frame_queue_main_init (handoff_dispatch_node.index, 0); vec_validate (hm->if_data, sw_if_index); d = vec_elt_at_index (hm->if_data, sw_if_index); vec_free (d->workers); vec_free (d->workers_bitmap); if (enable_disable) { d->workers_bitmap = bitmap; /* *INDENT-OFF* */ clib_bitmap_foreach (i, bitmap, ({ vec_add1(d->workers, i); })); /* *INDENT-ON* */ } vnet_feature_enable_disable ("device-input", "worker-handoff", sw_if_index, enable_disable, 0, 0); return rv; } static clib_error_t * set_interface_handoff_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { handoff_main_t *hm = &handoff_main; u32 sw_if_index = ~0; int enable_disable = 1; uword *bitmap = 0; u32 sym = ~0; int rv = 0; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "disable")) enable_disable = 0; else if (unformat (input, "workers %U", unformat_bitmap_list, &bitmap)) ; else if (unformat (input, "%U", unformat_vnet_sw_interface, vnet_get_main (), &sw_if_index)) ; else if (unformat (input, "symmetrical")) sym = 1; else if (unformat (input, "asymmetrical")) sym = 0; else break; } if (sw_if_index == ~0) return clib_error_return (0, "Please specify an interface..."); if (bitmap == 0) return clib_error_return (0, "Please specify list of workers..."); rv = interface_handoff_enable_disable (vm, sw_if_index, bitmap, enable_disable); switch (rv) { case 0: break; case VNET_API_ERROR_INVALID_SW_IF_INDEX: return clib_error_return (0, "Invalid interface"); break; case VNET_API_ERROR_INVALID_WORKER: return clib_error_return (0, "Invalid worker(s)"); break; case VNET_API_ERROR_UNIMPLEMENTED: return clib_error_return (0, "Device driver doesn't support redirection"); break; default: return clib_error_return (0, "unknown return value %d", rv); } if (sym == 1) hm->hash_fn = eth_get_sym_key; else if (sym == 0) hm->hash_fn = eth_get_key; return 0; } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (set_interface_handoff_command, static) = { .path = "set interface handoff", .short_help = "set interface handoff <interface-name> workers <workers-list> [symmetrical|asymmetrical]", .function = set_interface_handoff_command_fn, }; /* *INDENT-ON* */ typedef struct { u32 buffer_index; u32 next_index; u32 sw_if_index; } handoff_dispatch_trace_t; /* packet trace format function */ static u8 * format_handoff_dispatch_trace (u8 * s, va_list * args) { CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); handoff_dispatch_trace_t *t = va_arg (*args, handoff_dispatch_trace_t *); s = format (s, "handoff-dispatch: sw_if_index %d next_index %d buffer 0x%x", t->sw_if_index, t->next_index, t->buffer_index); return s; } #define foreach_handoff_dispatch_error \ _(EXAMPLE, "example packets") typedef enum { #define _(sym,str) HANDOFF_DISPATCH_ERROR_##sym, foreach_handoff_dispatch_error #undef _ HANDOFF_DISPATCH_N_ERROR, } handoff_dispatch_error_t; static char *handoff_dispatch_error_strings[] = { #define _(sym,string) string, foreach_handoff_dispatch_error #undef _ }; static uword handoff_dispatch_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, *from, *to_next; handoff_dispatch_next_t next_index; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from >= 4 && n_left_to_next >= 2) { u32 bi0, bi1; vlib_buffer_t *b0, *b1; u32 next0, next1; u32 sw_if_index0, sw_if_index1; /* Prefetch next iteration. */ { vlib_buffer_t *p2, *p3; p2 = vlib_get_buffer (vm, from[2]); p3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); } /* speculatively enqueue b0 and b1 to the current next frame */ to_next[0] = bi0 = from[0]; to_next[1] = bi1 = from[1]; from += 2; to_next += 2; n_left_from -= 2; n_left_to_next -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); next0 = vnet_buffer (b0)->handoff.next_index; next1 = vnet_buffer (b1)->handoff.next_index; if (PREDICT_FALSE (vm->trace_main.trace_active_hint)) { if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */ 0); handoff_dispatch_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; t->sw_if_index = sw_if_index0; t->next_index = next0; t->buffer_index = bi0; } if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED)) { vlib_trace_buffer (vm, node, next1, b1, /* follow_chain */ 0); handoff_dispatch_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t)); sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; t->sw_if_index = sw_if_index1; t->next_index = next1; t->buffer_index = bi1; } } /* verify speculative enqueues, maybe switch current next frame */ vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t *b0; u32 next0; u32 sw_if_index0; /* speculatively enqueue b0 to the current next frame */ bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); next0 = vnet_buffer (b0)->handoff.next_index; if (PREDICT_FALSE (vm->trace_main.trace_active_hint)) { if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */ 0); handoff_dispatch_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; t->sw_if_index = sw_if_index0; t->next_index = next0; t->buffer_index = bi0; } } /* verify speculative enqueue, maybe switch current next frame */ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (handoff_dispatch_node) = { .function = handoff_dispatch_node_fn, .name = "handoff-dispatch", .vector_size = sizeof (u32), .format_trace = format_handoff_dispatch_trace, .type = VLIB_NODE_TYPE_INTERNAL, .flags = VLIB_NODE_FLAG_IS_HANDOFF, .n_errors = ARRAY_LEN(handoff_dispatch_error_strings), .error_strings = handoff_dispatch_error_strings, .n_next_nodes = HANDOFF_DISPATCH_N_NEXT, .next_nodes = { [HANDOFF_DISPATCH_NEXT_DROP] = "error-drop", [HANDOFF_DISPATCH_NEXT_ETHERNET_INPUT] = "ethernet-input", [HANDOFF_DISPATCH_NEXT_IP4_INPUT] = "ip4-input-no-checksum", [HANDOFF_DISPATCH_NEXT_IP6_INPUT] = "ip6-input", [HANDOFF_DISPATCH_NEXT_MPLS_INPUT] = "mpls-input", }, }; VLIB_NODE_FUNCTION_MULTIARCH (handoff_dispatch_node, handoff_dispatch_node_fn) /* *INDENT-ON* */ clib_error_t * handoff_init (vlib_main_t * vm) { handoff_main_t *hm = &handoff_main; vlib_thread_main_t *tm = vlib_get_thread_main (); clib_error_t *error; uword *p; if ((error = vlib_call_init_function (vm, threads_init))) return error; vlib_thread_registration_t *tr; /* Only the standard vnet worker threads are supported */ p = hash_get_mem (tm->thread_registrations_by_name, "workers"); if (p) { tr = (vlib_thread_registration_t *) p[0]; if (tr) { hm->num_workers = tr->count; hm->first_worker_index = tr->first_index; } } hm->hash_fn = eth_get_key; hm->vlib_main = vm; hm->vnet_main = &vnet_main; hm->frame_queue_index = ~0; return 0; } VLIB_INIT_FUNCTION (handoff_init); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */


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