diff options
Diffstat (limited to 'src/vnet/devices/ssvm/node.c')
| -rw-r--r-- | src/vnet/devices/ssvm/node.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/src/vnet/devices/ssvm/node.c b/src/vnet/devices/ssvm/node.c new file mode 100644 index 00000000000..3a695b1d8c0 --- /dev/null +++ b/src/vnet/devices/ssvm/node.c @@ -0,0 +1,343 @@ +/* + * Copyright (c) 2015 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 "ssvm_eth.h" + +vlib_node_registration_t ssvm_eth_input_node; + +typedef struct +{ + u32 next_index; + u32 sw_if_index; +} ssvm_eth_input_trace_t; + +/* packet trace format function */ +static u8 * +format_ssvm_eth_input_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 *); + ssvm_eth_input_trace_t *t = va_arg (*args, ssvm_eth_input_trace_t *); + + s = format (s, "SSVM_ETH_INPUT: sw_if_index %d, next index %d", + t->sw_if_index, t->next_index); + return s; +} + +vlib_node_registration_t ssvm_eth_input_node; + +#define foreach_ssvm_eth_input_error \ +_(NO_BUFFERS, "Rx packet drops (no buffers)") + +typedef enum +{ +#define _(sym,str) SSVM_ETH_INPUT_ERROR_##sym, + foreach_ssvm_eth_input_error +#undef _ + SSVM_ETH_INPUT_N_ERROR, +} ssvm_eth_input_error_t; + +static char *ssvm_eth_input_error_strings[] = { +#define _(sym,string) string, + foreach_ssvm_eth_input_error +#undef _ +}; + +typedef enum +{ + SSVM_ETH_INPUT_NEXT_DROP, + SSVM_ETH_INPUT_NEXT_ETHERNET_INPUT, + SSVM_ETH_INPUT_NEXT_IP4_INPUT, + SSVM_ETH_INPUT_NEXT_IP6_INPUT, + SSVM_ETH_INPUT_NEXT_MPLS_INPUT, + SSVM_ETH_INPUT_N_NEXT, +} ssvm_eth_input_next_t; + +static inline uword +ssvm_eth_device_input (ssvm_eth_main_t * em, + ssvm_private_t * intfc, vlib_node_runtime_t * node) +{ + ssvm_shared_header_t *sh = intfc->sh; + vlib_main_t *vm = em->vlib_main; + unix_shared_memory_queue_t *q; + ssvm_eth_queue_elt_t *elt, *elts; + u32 elt_index; + u32 my_pid = intfc->my_pid; + int rx_queue_index; + u32 n_to_alloc = VLIB_FRAME_SIZE * 2; + u32 n_allocated, n_present_in_cache; + u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; + vlib_buffer_free_list_t *fl; + u32 n_left_to_next, *to_next; + u32 next0; + u32 n_buffers; + u32 n_available; + u32 bi0, saved_bi0; + vlib_buffer_t *b0, *prev; + u32 saved_cache_size = 0; + ethernet_header_t *eh0; + u16 type0; + u32 n_rx_bytes = 0, l3_offset0; + u32 cpu_index = os_get_cpu_number (); + u32 trace_cnt __attribute__ ((unused)) = vlib_get_trace_count (vm, node); + volatile u32 *lock; + u32 *elt_indices; + uword n_trace = vlib_get_trace_count (vm, node); + + /* Either side down? buh-bye... */ + if (pointer_to_uword (sh->opaque[MASTER_ADMIN_STATE_INDEX]) == 0 || + pointer_to_uword (sh->opaque[SLAVE_ADMIN_STATE_INDEX]) == 0) + return 0; + + if (intfc->i_am_master) + q = (unix_shared_memory_queue_t *) (sh->opaque[TO_MASTER_Q_INDEX]); + else + q = (unix_shared_memory_queue_t *) (sh->opaque[TO_SLAVE_Q_INDEX]); + + /* Nothing to do? */ + if (q->cursize == 0) + return 0; + + fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); + + vec_reset_length (intfc->rx_queue); + + lock = (u32 *) q; + while (__sync_lock_test_and_set (lock, 1)) + ; + while (q->cursize > 0) + { + unix_shared_memory_queue_sub_raw (q, (u8 *) & elt_index); + ASSERT (elt_index < 2048); + vec_add1 (intfc->rx_queue, elt_index); + } + CLIB_MEMORY_BARRIER (); + *lock = 0; + + n_present_in_cache = vec_len (em->buffer_cache); + + if (vec_len (em->buffer_cache) < vec_len (intfc->rx_queue) * 2) + { + vec_validate (em->buffer_cache, + n_to_alloc + vec_len (em->buffer_cache) - 1); + n_allocated = + vlib_buffer_alloc (vm, &em->buffer_cache[n_present_in_cache], + n_to_alloc); + + n_present_in_cache += n_allocated; + _vec_len (em->buffer_cache) = n_present_in_cache; + } + + elts = (ssvm_eth_queue_elt_t *) (sh->opaque[CHUNK_POOL_INDEX]); + + n_buffers = vec_len (intfc->rx_queue); + rx_queue_index = 0; + + while (n_buffers > 0) + { + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (n_buffers > 0 && n_left_to_next > 0) + { + elt = elts + intfc->rx_queue[rx_queue_index]; + + saved_cache_size = n_present_in_cache; + if (PREDICT_FALSE (saved_cache_size == 0)) + { + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + goto out; + } + saved_bi0 = bi0 = em->buffer_cache[--n_present_in_cache]; + b0 = vlib_get_buffer (vm, bi0); + prev = 0; + + while (1) + { + vlib_buffer_init_for_free_list (b0, fl); + + b0->current_data = elt->current_data_hint; + b0->current_length = elt->length_this_buffer; + b0->total_length_not_including_first_buffer = + elt->total_length_not_including_first_buffer; + + clib_memcpy (b0->data + b0->current_data, elt->data, + b0->current_length); + + if (PREDICT_FALSE (prev != 0)) + prev->next_buffer = bi0; + + if (PREDICT_FALSE (elt->flags & SSVM_BUFFER_NEXT_PRESENT)) + { + prev = b0; + if (PREDICT_FALSE (n_present_in_cache == 0)) + { + vlib_put_next_frame (vm, node, next_index, + n_left_to_next); + goto out; + } + bi0 = em->buffer_cache[--n_present_in_cache]; + b0 = vlib_get_buffer (vm, bi0); + } + else + break; + } + + saved_cache_size = n_present_in_cache; + + to_next[0] = saved_bi0; + to_next++; + n_left_to_next--; + + b0 = vlib_get_buffer (vm, saved_bi0); + eh0 = vlib_buffer_get_current (b0); + + type0 = clib_net_to_host_u16 (eh0->type); + + next0 = SSVM_ETH_INPUT_NEXT_ETHERNET_INPUT; + + if (type0 == ETHERNET_TYPE_IP4) + next0 = SSVM_ETH_INPUT_NEXT_IP4_INPUT; + else if (type0 == ETHERNET_TYPE_IP6) + next0 = SSVM_ETH_INPUT_NEXT_IP6_INPUT; + else if (type0 == ETHERNET_TYPE_MPLS_UNICAST) + next0 = SSVM_ETH_INPUT_NEXT_MPLS_INPUT; + + l3_offset0 = ((next0 == SSVM_ETH_INPUT_NEXT_IP4_INPUT || + next0 == SSVM_ETH_INPUT_NEXT_IP6_INPUT || + next0 == SSVM_ETH_INPUT_NEXT_MPLS_INPUT) ? + sizeof (ethernet_header_t) : 0); + + n_rx_bytes += b0->current_length + + b0->total_length_not_including_first_buffer; + + b0->current_data += l3_offset0; + b0->current_length -= l3_offset0; + b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID; + + vnet_buffer (b0)->sw_if_index[VLIB_RX] = intfc->vlib_hw_if_index; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + + /* + * Turn this on if you run into + * "bad monkey" contexts, and you want to know exactly + * which nodes they've visited... See main.c... + */ + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0); + + if (PREDICT_FALSE (n_trace > 0)) + { + ssvm_eth_input_trace_t *tr; + + vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */ 1); + vlib_set_trace_count (vm, node, --n_trace); + + tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); + + tr->next_index = next0; + tr->sw_if_index = intfc->vlib_hw_if_index; + } + + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + bi0, next0); + n_buffers--; + rx_queue_index++; + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + +out: + if (em->buffer_cache) + _vec_len (em->buffer_cache) = saved_cache_size; + else + ASSERT (saved_cache_size == 0); + + ssvm_lock (sh, my_pid, 2); + + ASSERT (vec_len (intfc->rx_queue) > 0); + + n_available = (u32) pointer_to_uword (sh->opaque[CHUNK_POOL_NFREE]); + elt_indices = (u32 *) (sh->opaque[CHUNK_POOL_FREELIST_INDEX]); + + clib_memcpy (&elt_indices[n_available], intfc->rx_queue, + vec_len (intfc->rx_queue) * sizeof (u32)); + + n_available += vec_len (intfc->rx_queue); + sh->opaque[CHUNK_POOL_NFREE] = uword_to_pointer (n_available, void *); + + ssvm_unlock (sh); + + vlib_error_count (vm, node->node_index, SSVM_ETH_INPUT_ERROR_NO_BUFFERS, + n_buffers); + + vlib_increment_combined_counter + (vnet_get_main ()->interface_main.combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, cpu_index, + intfc->vlib_hw_if_index, rx_queue_index, n_rx_bytes); + + return rx_queue_index; +} + +static uword +ssvm_eth_input_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame) +{ + ssvm_eth_main_t *em = &ssvm_eth_main; + ssvm_private_t *intfc; + uword n_rx_packets = 0; + + vec_foreach (intfc, em->intfcs) + { + n_rx_packets += ssvm_eth_device_input (em, intfc, node); + } + + return n_rx_packets; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ssvm_eth_input_node) = { + .function = ssvm_eth_input_node_fn, + .name = "ssvm_eth_input", + .vector_size = sizeof (u32), + .format_trace = format_ssvm_eth_input_trace, + .type = VLIB_NODE_TYPE_INPUT, + .state = VLIB_NODE_STATE_DISABLED, + + .n_errors = ARRAY_LEN(ssvm_eth_input_error_strings), + .error_strings = ssvm_eth_input_error_strings, + + .n_next_nodes = SSVM_ETH_INPUT_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [SSVM_ETH_INPUT_NEXT_DROP] = "error-drop", + [SSVM_ETH_INPUT_NEXT_ETHERNET_INPUT] = "ethernet-input", + [SSVM_ETH_INPUT_NEXT_IP4_INPUT] = "ip4-input", + [SSVM_ETH_INPUT_NEXT_IP6_INPUT] = "ip6-input", + [SSVM_ETH_INPUT_NEXT_MPLS_INPUT] = "mpls-input", + }, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (ssvm_eth_input_node, ssvm_eth_input_node_fn) +/* *INDENT-ON* */ + + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |