diff options
Diffstat (limited to 'src/vnet/devices/netmap/netmap.c')
| -rw-r--r-- | src/vnet/devices/netmap/netmap.c | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/src/vnet/devices/netmap/netmap.c b/src/vnet/devices/netmap/netmap.c new file mode 100644 index 00000000000..3bdb442dda2 --- /dev/null +++ b/src/vnet/devices/netmap/netmap.c @@ -0,0 +1,316 @@ +/* + *------------------------------------------------------------------ + * 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 <stdint.h> +#include <net/if.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <fcntl.h> +#include <vnet/devices/netmap/net_netmap.h> + +#include <vlib/vlib.h> +#include <vlib/unix/unix.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/devices/netmap/netmap.h> + +static u32 +netmap_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi, + u32 flags) +{ + /* nothing for now */ + return 0; +} + +static clib_error_t * +netmap_fd_read_ready (unix_file_t * uf) +{ + vlib_main_t *vm = vlib_get_main (); + netmap_main_t *nm = &netmap_main; + u32 idx = uf->private_data; + + nm->pending_input_bitmap = + clib_bitmap_set (nm->pending_input_bitmap, idx, 1); + + /* Schedule the rx node */ + vlib_node_set_interrupt_pending (vm, netmap_input_node.index); + + return 0; +} + +static void +close_netmap_if (netmap_main_t * nm, netmap_if_t * nif) +{ + if (nif->unix_file_index != ~0) + { + unix_file_del (&unix_main, unix_main.file_pool + nif->unix_file_index); + nif->unix_file_index = ~0; + } + else if (nif->fd > -1) + close (nif->fd); + + if (nif->mem_region) + { + netmap_mem_region_t *reg = &nm->mem_regions[nif->mem_region]; + if (--reg->refcnt == 0) + { + munmap (reg->mem, reg->region_size); + reg->region_size = 0; + } + } + + + mhash_unset (&nm->if_index_by_host_if_name, nif->host_if_name, + &nif->if_index); + vec_free (nif->host_if_name); + vec_free (nif->req); + + memset (nif, 0, sizeof (*nif)); + pool_put (nm->interfaces, nif); +} + +int +netmap_worker_thread_enable () +{ + /* if worker threads are enabled, switch to polling mode */ + foreach_vlib_main (( + { + vlib_node_set_state (this_vlib_main, + netmap_input_node.index, + VLIB_NODE_STATE_POLLING); + })); + + return 0; +} + +int +netmap_worker_thread_disable () +{ + foreach_vlib_main (( + { + vlib_node_set_state (this_vlib_main, + netmap_input_node.index, + VLIB_NODE_STATE_INTERRUPT); + })); + + return 0; +} + +int +netmap_create_if (vlib_main_t * vm, u8 * if_name, u8 * hw_addr_set, + u8 is_pipe, u8 is_master, u32 * sw_if_index) +{ + netmap_main_t *nm = &netmap_main; + int ret = 0; + netmap_if_t *nif = 0; + u8 hw_addr[6]; + clib_error_t *error = 0; + vnet_sw_interface_t *sw; + vnet_main_t *vnm = vnet_get_main (); + uword *p; + struct nmreq *req = 0; + netmap_mem_region_t *reg; + vlib_thread_main_t *tm = vlib_get_thread_main (); + int fd; + + p = mhash_get (&nm->if_index_by_host_if_name, if_name); + if (p) + return VNET_API_ERROR_SUBIF_ALREADY_EXISTS; + + fd = open ("/dev/netmap", O_RDWR); + if (fd < 0) + return VNET_API_ERROR_SUBIF_ALREADY_EXISTS; + + pool_get (nm->interfaces, nif); + nif->if_index = nif - nm->interfaces; + nif->fd = fd; + nif->unix_file_index = ~0; + + vec_validate (req, 0); + nif->req = req; + req->nr_version = NETMAP_API; + req->nr_flags = NR_REG_ALL_NIC; + + if (is_pipe) + req->nr_flags = is_master ? NR_REG_PIPE_MASTER : NR_REG_PIPE_SLAVE; + else + req->nr_flags = NR_REG_ALL_NIC; + + req->nr_flags |= NR_ACCEPT_VNET_HDR; + snprintf (req->nr_name, IFNAMSIZ, "%s", if_name); + req->nr_name[IFNAMSIZ - 1] = 0; + + if (ioctl (nif->fd, NIOCREGIF, req)) + { + ret = VNET_API_ERROR_NOT_CONNECTED; + goto error; + } + + nif->mem_region = req->nr_arg2; + vec_validate (nm->mem_regions, nif->mem_region); + reg = &nm->mem_regions[nif->mem_region]; + if (reg->region_size == 0) + { + reg->mem = mmap (NULL, req->nr_memsize, PROT_READ | PROT_WRITE, + MAP_SHARED, fd, 0); + clib_warning ("mem %p", reg->mem); + if (reg->mem == MAP_FAILED) + { + ret = VNET_API_ERROR_NOT_CONNECTED; + goto error; + } + reg->region_size = req->nr_memsize; + } + reg->refcnt++; + + nif->nifp = NETMAP_IF (reg->mem, req->nr_offset); + nif->first_rx_ring = 0; + nif->last_rx_ring = 0; + nif->first_tx_ring = 0; + nif->last_tx_ring = 0; + nif->host_if_name = if_name; + nif->per_interface_next_index = ~0; + + if (tm->n_vlib_mains > 1) + { + nif->lockp = clib_mem_alloc_aligned (CLIB_CACHE_LINE_BYTES, + CLIB_CACHE_LINE_BYTES); + memset ((void *) nif->lockp, 0, CLIB_CACHE_LINE_BYTES); + } + + { + unix_file_t template = { 0 }; + template.read_function = netmap_fd_read_ready; + template.file_descriptor = nif->fd; + template.private_data = nif->if_index; + nif->unix_file_index = unix_file_add (&unix_main, &template); + } + + /*use configured or generate random MAC address */ + if (hw_addr_set) + memcpy (hw_addr, hw_addr_set, 6); + else + { + f64 now = vlib_time_now (vm); + u32 rnd; + rnd = (u32) (now * 1e6); + rnd = random_u32 (&rnd); + + memcpy (hw_addr + 2, &rnd, sizeof (rnd)); + hw_addr[0] = 2; + hw_addr[1] = 0xfe; + } + + error = ethernet_register_interface (vnm, netmap_device_class.index, + nif->if_index, hw_addr, + &nif->hw_if_index, + netmap_eth_flag_change); + + if (error) + { + clib_error_report (error); + ret = VNET_API_ERROR_SYSCALL_ERROR_1; + goto error; + } + + sw = vnet_get_hw_sw_interface (vnm, nif->hw_if_index); + nif->sw_if_index = sw->sw_if_index; + + mhash_set_mem (&nm->if_index_by_host_if_name, if_name, &nif->if_index, 0); + + if (sw_if_index) + *sw_if_index = nif->sw_if_index; + + if (tm->n_vlib_mains > 1 && pool_elts (nm->interfaces) == 1) + netmap_worker_thread_enable (); + + return 0; + +error: + close_netmap_if (nm, nif); + return ret; +} + +int +netmap_delete_if (vlib_main_t * vm, u8 * host_if_name) +{ + vnet_main_t *vnm = vnet_get_main (); + netmap_main_t *nm = &netmap_main; + netmap_if_t *nif; + uword *p; + vlib_thread_main_t *tm = vlib_get_thread_main (); + + p = mhash_get (&nm->if_index_by_host_if_name, host_if_name); + if (p == NULL) + { + clib_warning ("Host interface %s does not exist", host_if_name); + return VNET_API_ERROR_SYSCALL_ERROR_1; + } + nif = pool_elt_at_index (nm->interfaces, p[0]); + + /* bring down the interface */ + vnet_hw_interface_set_flags (vnm, nif->hw_if_index, 0); + + ethernet_delete_interface (vnm, nif->hw_if_index); + + close_netmap_if (nm, nif); + + if (tm->n_vlib_mains > 1 && pool_elts (nm->interfaces) == 0) + netmap_worker_thread_disable (); + + return 0; +} + +static clib_error_t * +netmap_init (vlib_main_t * vm) +{ + netmap_main_t *nm = &netmap_main; + vlib_thread_main_t *tm = vlib_get_thread_main (); + vlib_thread_registration_t *tr; + uword *p; + + memset (nm, 0, sizeof (netmap_main_t)); + + nm->input_cpu_first_index = 0; + nm->input_cpu_count = 1; + + /* find out which cpus will be used for input */ + p = hash_get_mem (tm->thread_registrations_by_name, "workers"); + tr = p ? (vlib_thread_registration_t *) p[0] : 0; + + if (tr && tr->count > 0) + { + nm->input_cpu_first_index = tr->first_index; + nm->input_cpu_count = tr->count; + } + + mhash_init_vec_string (&nm->if_index_by_host_if_name, sizeof (uword)); + + vec_validate_aligned (nm->rx_buffers, tm->n_vlib_mains - 1, + CLIB_CACHE_LINE_BYTES); + + return 0; +} + +VLIB_INIT_FUNCTION (netmap_init); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |