diff options
Diffstat (limited to 'src/vnet/devices/ssvm/ssvm_eth.c')
| -rw-r--r-- | src/vnet/devices/ssvm/ssvm_eth.c | 491 |
1 files changed, 491 insertions, 0 deletions
diff --git a/src/vnet/devices/ssvm/ssvm_eth.c b/src/vnet/devices/ssvm/ssvm_eth.c new file mode 100644 index 00000000..db4fafa9 --- /dev/null +++ b/src/vnet/devices/ssvm/ssvm_eth.c @@ -0,0 +1,491 @@ +/* + * 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" + +ssvm_eth_main_t ssvm_eth_main; + +#define foreach_ssvm_eth_tx_func_error \ +_(RING_FULL, "Tx packet drops (ring full)") \ +_(NO_BUFFERS, "Tx packet drops (no buffers)") \ +_(ADMIN_DOWN, "Tx packet drops (admin down)") + +typedef enum +{ +#define _(f,s) SSVM_ETH_TX_ERROR_##f, + foreach_ssvm_eth_tx_func_error +#undef _ + SSVM_ETH_TX_N_ERROR, +} ssvm_eth_tx_func_error_t; + +static u32 ssvm_eth_flag_change (vnet_main_t * vnm, + vnet_hw_interface_t * hi, u32 flags); + +int +ssvm_eth_create (ssvm_eth_main_t * em, u8 * name, int is_master) +{ + ssvm_private_t *intfc; + void *oldheap; + clib_error_t *e; + unix_shared_memory_queue_t *q; + ssvm_shared_header_t *sh; + ssvm_eth_queue_elt_t *elts; + u32 *elt_indices; + u8 enet_addr[6]; + int i, rv; + + vec_add2 (em->intfcs, intfc, 1); + + intfc->ssvm_size = em->segment_size; + intfc->i_am_master = 1; + intfc->name = name; + intfc->my_pid = getpid (); + if (is_master == 0) + { + rv = ssvm_slave_init (intfc, 20 /* timeout in seconds */ ); + if (rv < 0) + return rv; + goto create_vnet_interface; + } + + intfc->requested_va = em->next_base_va; + em->next_base_va += em->segment_size; + rv = ssvm_master_init (intfc, intfc - em->intfcs /* master index */ ); + + if (rv < 0) + return rv; + + /* OK, segment created, set up queues and so forth. */ + + sh = intfc->sh; + oldheap = ssvm_push_heap (sh); + + q = unix_shared_memory_queue_init (em->queue_elts, sizeof (u32), + 0 /* consumer pid not interesting */ , + 0 /* signal not sent */ ); + sh->opaque[TO_MASTER_Q_INDEX] = (void *) q; + q = unix_shared_memory_queue_init (em->queue_elts, sizeof (u32), + 0 /* consumer pid not interesting */ , + 0 /* signal not sent */ ); + sh->opaque[TO_SLAVE_Q_INDEX] = (void *) q; + + /* + * Preallocate the requested number of buffer chunks + * There must be a better way to do this, etc. + * Add some slop to avoid pool reallocation, which will not go well + */ + elts = 0; + elt_indices = 0; + + vec_validate_aligned (elts, em->nbuffers - 1, CLIB_CACHE_LINE_BYTES); + vec_validate_aligned (elt_indices, em->nbuffers - 1, CLIB_CACHE_LINE_BYTES); + + for (i = 0; i < em->nbuffers; i++) + elt_indices[i] = i; + + sh->opaque[CHUNK_POOL_INDEX] = (void *) elts; + sh->opaque[CHUNK_POOL_FREELIST_INDEX] = (void *) elt_indices; + sh->opaque[CHUNK_POOL_NFREE] = (void *) (uword) em->nbuffers; + + ssvm_pop_heap (oldheap); + +create_vnet_interface: + + sh = intfc->sh; + + memset (enet_addr, 0, sizeof (enet_addr)); + enet_addr[0] = 2; + enet_addr[1] = 0xFE; + enet_addr[2] = is_master; + enet_addr[5] = sh->master_index; + + e = ethernet_register_interface + (em->vnet_main, ssvm_eth_device_class.index, intfc - em->intfcs, + /* ethernet address */ enet_addr, + &intfc->vlib_hw_if_index, ssvm_eth_flag_change); + + if (e) + { + clib_error_report (e); + /* $$$$ unmap offending region? */ + return VNET_API_ERROR_INVALID_INTERFACE; + } + + /* Declare link up */ + vnet_hw_interface_set_flags (em->vnet_main, intfc->vlib_hw_if_index, + VNET_HW_INTERFACE_FLAG_LINK_UP); + + /* Let the games begin... */ + if (is_master) + sh->ready = 1; + return 0; +} + +static clib_error_t * +ssvm_config (vlib_main_t * vm, unformat_input_t * input) +{ + u8 *name; + int is_master = 1; + int i, rv; + ssvm_eth_main_t *em = &ssvm_eth_main; + + while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "base-va %llx", &em->next_base_va)) + ; + else if (unformat (input, "segment-size %lld", &em->segment_size)) + em->segment_size = 1ULL << (max_log2 (em->segment_size)); + else if (unformat (input, "nbuffers %lld", &em->nbuffers)) + ; + else if (unformat (input, "queue-elts %lld", &em->queue_elts)) + ; + else if (unformat (input, "slave")) + is_master = 0; + else if (unformat (input, "%s", &name)) + vec_add1 (em->names, name); + else + break; + } + + /* No configured instances, we're done... */ + if (vec_len (em->names) == 0) + return 0; + + for (i = 0; i < vec_len (em->names); i++) + { + rv = ssvm_eth_create (em, em->names[i], is_master); + if (rv < 0) + return clib_error_return (0, "ssvm_eth_create '%s' failed, error %d", + em->names[i], rv); + } + + vlib_node_set_state (vm, ssvm_eth_input_node.index, + VLIB_NODE_STATE_POLLING); + + return 0; +} + +VLIB_CONFIG_FUNCTION (ssvm_config, "ssvm_eth"); + + +static clib_error_t * +ssvm_eth_init (vlib_main_t * vm) +{ + ssvm_eth_main_t *em = &ssvm_eth_main; + + if (((sizeof (ssvm_eth_queue_elt_t) / CLIB_CACHE_LINE_BYTES) + * CLIB_CACHE_LINE_BYTES) != sizeof (ssvm_eth_queue_elt_t)) + clib_warning ("ssvm_eth_queue_elt_t size %d not a multiple of %d", + sizeof (ssvm_eth_queue_elt_t), CLIB_CACHE_LINE_BYTES); + + em->vlib_main = vm; + em->vnet_main = vnet_get_main (); + em->elog_main = &vm->elog_main; + + /* default config param values... */ + + em->next_base_va = 0x600000000ULL; + /* + * Allocate 2 full superframes in each dir (256 x 2 x 2 x 2048 bytes), + * 2mb; double that so we have plenty of space... 4mb + */ + em->segment_size = 8 << 20; + em->nbuffers = 1024; + em->queue_elts = 512; + return 0; +} + +VLIB_INIT_FUNCTION (ssvm_eth_init); + +static char *ssvm_eth_tx_func_error_strings[] = { +#define _(n,s) s, + foreach_ssvm_eth_tx_func_error +#undef _ +}; + +static u8 * +format_ssvm_eth_device_name (u8 * s, va_list * args) +{ + u32 i = va_arg (*args, u32); + + s = format (s, "ssvmEthernet%d", i); + return s; +} + +static u8 * +format_ssvm_eth_device (u8 * s, va_list * args) +{ + s = format (s, "SSVM Ethernet"); + return s; +} + +static u8 * +format_ssvm_eth_tx_trace (u8 * s, va_list * args) +{ + s = format (s, "Unimplemented..."); + return s; +} + + +static uword +ssvm_eth_interface_tx (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * f) +{ + ssvm_eth_main_t *em = &ssvm_eth_main; + vnet_interface_output_runtime_t *rd = (void *) node->runtime_data; + ssvm_private_t *intfc = vec_elt_at_index (em->intfcs, rd->dev_instance); + ssvm_shared_header_t *sh = intfc->sh; + unix_shared_memory_queue_t *q; + u32 *from; + u32 n_left; + ssvm_eth_queue_elt_t *elts, *elt, *prev_elt; + u32 my_pid = intfc->my_pid; + vlib_buffer_t *b0; + u32 bi0; + u32 size_this_buffer; + u32 chunks_this_buffer; + u8 i_am_master = intfc->i_am_master; + u32 elt_index; + int is_ring_full, interface_down; + int i; + volatile u32 *queue_lock; + u32 n_to_alloc = VLIB_FRAME_SIZE; + u32 n_allocated, n_present_in_cache, n_available; + u32 *elt_indices; + + if (i_am_master) + q = (unix_shared_memory_queue_t *) sh->opaque[TO_SLAVE_Q_INDEX]; + else + q = (unix_shared_memory_queue_t *) sh->opaque[TO_MASTER_Q_INDEX]; + + queue_lock = (u32 *) q; + + from = vlib_frame_vector_args (f); + n_left = f->n_vectors; + is_ring_full = 0; + interface_down = 0; + + n_present_in_cache = vec_len (em->chunk_cache); + + /* admin / link up/down check */ + if (sh->opaque[MASTER_ADMIN_STATE_INDEX] == 0 || + sh->opaque[SLAVE_ADMIN_STATE_INDEX] == 0) + { + interface_down = 1; + goto out; + } + + ssvm_lock (sh, my_pid, 1); + + elts = (ssvm_eth_queue_elt_t *) (sh->opaque[CHUNK_POOL_INDEX]); + elt_indices = (u32 *) (sh->opaque[CHUNK_POOL_FREELIST_INDEX]); + n_available = (u32) pointer_to_uword (sh->opaque[CHUNK_POOL_NFREE]); + + if (n_present_in_cache < n_left * 2) + { + vec_validate (em->chunk_cache, n_to_alloc + n_present_in_cache - 1); + + n_allocated = n_to_alloc < n_available ? n_to_alloc : n_available; + + if (PREDICT_TRUE (n_allocated > 0)) + { + clib_memcpy (&em->chunk_cache[n_present_in_cache], + &elt_indices[n_available - n_allocated], + sizeof (u32) * n_allocated); + } + + n_present_in_cache += n_allocated; + n_available -= n_allocated; + sh->opaque[CHUNK_POOL_NFREE] = uword_to_pointer (n_available, void *); + _vec_len (em->chunk_cache) = n_present_in_cache; + } + + ssvm_unlock (sh); + + while (n_left) + { + bi0 = from[0]; + b0 = vlib_get_buffer (vm, bi0); + + size_this_buffer = vlib_buffer_length_in_chain (vm, b0); + chunks_this_buffer = (size_this_buffer + (SSVM_BUFFER_SIZE - 1)) + / SSVM_BUFFER_SIZE; + + /* If we're not going to be able to enqueue the buffer, tail drop. */ + if (q->cursize >= q->maxsize) + { + is_ring_full = 1; + break; + } + + prev_elt = 0; + elt_index = ~0; + for (i = 0; i < chunks_this_buffer; i++) + { + if (PREDICT_FALSE (n_present_in_cache == 0)) + goto out; + + elt_index = em->chunk_cache[--n_present_in_cache]; + elt = elts + elt_index; + + elt->type = SSVM_PACKET_TYPE; + elt->flags = 0; + elt->total_length_not_including_first_buffer = + b0->total_length_not_including_first_buffer; + elt->length_this_buffer = b0->current_length; + elt->current_data_hint = b0->current_data; + elt->owner = !i_am_master; + elt->tag = 1; + + clib_memcpy (elt->data, b0->data + b0->current_data, + b0->current_length); + + if (PREDICT_FALSE (prev_elt != 0)) + prev_elt->next_index = elt - elts; + + if (PREDICT_FALSE (i < (chunks_this_buffer - 1))) + { + elt->flags = SSVM_BUFFER_NEXT_PRESENT; + ASSERT (b0->flags & VLIB_BUFFER_NEXT_PRESENT); + b0 = vlib_get_buffer (vm, b0->next_buffer); + } + prev_elt = elt; + } + + while (__sync_lock_test_and_set (queue_lock, 1)) + ; + + unix_shared_memory_queue_add_raw (q, (u8 *) & elt_index); + CLIB_MEMORY_BARRIER (); + *queue_lock = 0; + + from++; + n_left--; + } + +out: + if (PREDICT_FALSE (n_left)) + { + if (is_ring_full) + vlib_error_count (vm, node->node_index, SSVM_ETH_TX_ERROR_RING_FULL, + n_left); + else if (interface_down) + vlib_error_count (vm, node->node_index, SSVM_ETH_TX_ERROR_ADMIN_DOWN, + n_left); + else + vlib_error_count (vm, node->node_index, SSVM_ETH_TX_ERROR_NO_BUFFERS, + n_left); + + vlib_buffer_free (vm, from, n_left); + } + else + vlib_buffer_free (vm, vlib_frame_vector_args (f), f->n_vectors); + + if (PREDICT_TRUE (vec_len (em->chunk_cache))) + _vec_len (em->chunk_cache) = n_present_in_cache; + + return f->n_vectors; +} + +static void +ssvm_eth_clear_hw_interface_counters (u32 instance) +{ + /* Nothing for now */ +} + +static clib_error_t * +ssvm_eth_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, + u32 flags) +{ + vnet_hw_interface_t *hif = vnet_get_hw_interface (vnm, hw_if_index); + uword is_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0; + ssvm_eth_main_t *em = &ssvm_eth_main; + ssvm_private_t *intfc = vec_elt_at_index (em->intfcs, hif->dev_instance); + ssvm_shared_header_t *sh; + + /* publish link-state in shared-memory, to discourage buffer-wasting */ + sh = intfc->sh; + if (intfc->i_am_master) + sh->opaque[MASTER_ADMIN_STATE_INDEX] = (void *) is_up; + else + sh->opaque[SLAVE_ADMIN_STATE_INDEX] = (void *) is_up; + + return 0; +} + +static clib_error_t * +ssvm_eth_subif_add_del_function (vnet_main_t * vnm, + u32 hw_if_index, + struct vnet_sw_interface_t *st, int is_add) +{ + /* Nothing for now */ + return 0; +} + +/* + * Dynamically redirect all pkts from a specific interface + * to the specified node + */ +static void +ssvm_eth_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index, + u32 node_index) +{ + ssvm_eth_main_t *em = &ssvm_eth_main; + vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index); + ssvm_private_t *intfc = pool_elt_at_index (em->intfcs, hw->dev_instance); + + /* Shut off redirection */ + if (node_index == ~0) + { + intfc->per_interface_next_index = node_index; + return; + } + + intfc->per_interface_next_index = + vlib_node_add_next (em->vlib_main, ssvm_eth_input_node.index, node_index); +} + +static u32 +ssvm_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi, u32 flags) +{ + /* nothing for now */ + return 0; +} + +/* *INDENT-OFF* */ +VNET_DEVICE_CLASS (ssvm_eth_device_class) = { + .name = "ssvm-eth", + .tx_function = ssvm_eth_interface_tx, + .tx_function_n_errors = SSVM_ETH_TX_N_ERROR, + .tx_function_error_strings = ssvm_eth_tx_func_error_strings, + .format_device_name = format_ssvm_eth_device_name, + .format_device = format_ssvm_eth_device, + .format_tx_trace = format_ssvm_eth_tx_trace, + .clear_counters = ssvm_eth_clear_hw_interface_counters, + .admin_up_down_function = ssvm_eth_interface_admin_up_down, + .subif_add_del_function = ssvm_eth_subif_add_del_function, + .rx_redirect_to_node = ssvm_eth_set_interface_next_node, +}; + +VLIB_DEVICE_TX_FUNCTION_MULTIARCH (ssvm_eth_device_class, + ssvm_eth_interface_tx) +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |