diff options
Diffstat (limited to 'vnet/vnet/devices/netmap/device.c')
-rw-r--r-- | vnet/vnet/devices/netmap/device.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/vnet/vnet/devices/netmap/device.c b/vnet/vnet/devices/netmap/device.c new file mode 100644 index 00000000000..36e17da2a22 --- /dev/null +++ b/vnet/vnet/devices/netmap/device.c @@ -0,0 +1,221 @@ +/* + *------------------------------------------------------------------ + * 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 <vlib/vlib.h> +#include <vlib/unix/unix.h> +#include <vnet/ethernet/ethernet.h> + +#include <vnet/devices/netmap/netmap.h> + +#define foreach_netmap_tx_func_error \ +_(NO_FREE_SLOTS, "no free tx slots") + +typedef enum { +#define _(f,s) NETMAP_TX_ERROR_##f, + foreach_netmap_tx_func_error +#undef _ + NETMAP_TX_N_ERROR, +} netmap_tx_func_error_t; + +static char * netmap_tx_func_error_strings[] = { +#define _(n,s) s, + foreach_netmap_tx_func_error +#undef _ +}; + + +static u8 * format_netmap_device_name (u8 * s, va_list * args) +{ + u32 i = va_arg (*args, u32); + netmap_main_t * apm = &netmap_main; + netmap_if_t * nif = pool_elt_at_index (apm->interfaces, i); + + s = format (s, "netmap-%s", nif->host_if_name); + return s; +} + +static u8 * format_netmap_device (u8 * s, va_list * args) +{ + u32 dev_instance = va_arg (*args, u32); + int verbose = va_arg (*args, int); + netmap_main_t * nm = &netmap_main; + netmap_if_t * nif = vec_elt_at_index (nm->interfaces, dev_instance); + uword indent = format_get_indent (s); + + s = format (s, "NETMAP interface"); + if (verbose) + { + s = format (s, "\n%U version %d flags 0x%x" + "\n%U region %u memsize 0x%x offset 0x%x" + "\n%U tx_slots %u rx_slots %u tx_rings %u rx_rings %u", + format_white_space, indent + 2, + nif->req->nr_version, + nif->req->nr_flags, + format_white_space, indent + 2, + nif->mem_region, + nif->req->nr_memsize, + nif->req->nr_offset, + format_white_space, indent + 2, + nif->req->nr_tx_slots, + nif->req->nr_rx_slots, + nif->req->nr_tx_rings, + nif->req->nr_rx_rings); + } + return s; +} + +static u8 * format_netmap_tx_trace (u8 * s, va_list * args) +{ + s = format (s, "Unimplemented..."); + return s; +} + +static uword +netmap_interface_tx (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + netmap_main_t * nm = &netmap_main; + u32 * buffers = vlib_frame_args (frame); + u32 n_left = frame->n_vectors; + vnet_interface_output_runtime_t * rd = (void *) node->runtime_data; + netmap_if_t * nif = pool_elt_at_index (nm->interfaces, rd->dev_instance); + int cur_ring; + + cur_ring = nif->first_tx_ring; + + while(n_left && cur_ring <= nif->last_tx_ring) + { + struct netmap_ring * ring = NETMAP_TXRING(nif->nifp, cur_ring); + int n_free_slots = nm_ring_space(ring); + uint cur = ring->cur; + + if (!n_free_slots) + { + cur_ring++; + continue; + } + + while (n_left && n_free_slots) + { + vlib_buffer_t * b0; + u32 bi = buffers[0]; + u32 len; + u32 offset = 0; + buffers++; + + struct netmap_slot * slot = &ring->slot[cur]; + + do + { + b0 = vlib_get_buffer (vm, bi); + len = b0->current_length; + /* memcpy */ + clib_memcpy ((u8 *) NETMAP_BUF(ring, slot->buf_idx) + offset, + vlib_buffer_get_current(b0), len); + offset += len; + } + while ((bi = b0->next_buffer)); + + slot->len = offset; + cur = (cur + 1) % ring->num_slots; + n_free_slots--; + n_left--; + } + CLIB_MEMORY_BARRIER(); + ring->head = ring->cur = cur; + } + + if (n_left < frame->n_vectors) + ioctl(nif->fd, NIOCTXSYNC, NULL); + + if (n_left) + vlib_error_count (vm, node->node_index, NETMAP_TX_ERROR_NO_FREE_SLOTS, + n_left); + + vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors); + return frame->n_vectors; +} + +static void +netmap_set_interface_next_node (vnet_main_t *vnm, u32 hw_if_index, + u32 node_index) +{ + netmap_main_t * apm = &netmap_main; + vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index); + netmap_if_t * nif = pool_elt_at_index (apm->interfaces, hw->dev_instance); + + /* Shut off redirection */ + if (node_index == ~0) + { + nif->per_interface_next_index = node_index; + return; + } + + nif->per_interface_next_index = + vlib_node_add_next (vlib_get_main(), netmap_input_node.index, node_index); +} + +static void netmap_clear_hw_interface_counters (u32 instance) +{ + /* Nothing for now */ +} + +static clib_error_t * +netmap_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags) +{ + netmap_main_t * apm = &netmap_main; + vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index); + netmap_if_t * nif = pool_elt_at_index (apm->interfaces, hw->dev_instance); + u32 hw_flags; + + nif->is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0; + + if (nif->is_admin_up) + hw_flags = VNET_HW_INTERFACE_FLAG_LINK_UP; + else + hw_flags = 0; + + vnet_hw_interface_set_flags(vnm, hw_if_index, hw_flags); + + return 0; +} + +static clib_error_t * +netmap_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; +} + +VNET_DEVICE_CLASS (netmap_device_class) = { + .name = "netmap", + .tx_function = netmap_interface_tx, + .format_device_name = format_netmap_device_name, + .format_device = format_netmap_device, + .format_tx_trace = format_netmap_tx_trace, + .tx_function_n_errors = NETMAP_TX_N_ERROR, + .tx_function_error_strings = netmap_tx_func_error_strings, + .rx_redirect_to_node = netmap_set_interface_next_node, + .clear_counters = netmap_clear_hw_interface_counters, + .admin_up_down_function = netmap_interface_admin_up_down, + .subif_add_del_function = netmap_subif_add_del_function, + .no_flatten_output_chains = 1, +}; 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