diff options
Diffstat (limited to 'src/plugins/af_packet/device.c')
| -rw-r--r-- | src/plugins/af_packet/device.c | 793 |
1 files changed, 793 insertions, 0 deletions
diff --git a/src/plugins/af_packet/device.c b/src/plugins/af_packet/device.c new file mode 100644 index 00000000000..d76dad3dde0 --- /dev/null +++ b/src/plugins/af_packet/device.c @@ -0,0 +1,793 @@ +/* + *------------------------------------------------------------------ + * af_packet.c - linux kernel packet interface + * + * 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 <linux/if_packet.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#include <net/if.h> +#include <net/if_arp.h> + +#include <vlib/vlib.h> +#include <vlib/unix/unix.h> +#include <vnet/ip/ip.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/ip/ip4_packet.h> +#include <vnet/ip/ip6_packet.h> +#include <vnet/ip/ip_psh_cksum.h> +#include <vnet/tcp/tcp_packet.h> +#include <vnet/udp/udp_packet.h> + +#include <af_packet/af_packet.h> +#include <vnet/devices/virtio/virtio_std.h> +#include <vnet/devices/netlink.h> + +#define foreach_af_packet_tx_func_error \ +_(FRAME_NOT_READY, "tx frame not ready") \ +_(TXRING_EAGAIN, "tx sendto temporary failure") \ +_(TXRING_FATAL, "tx sendto fatal failure") \ +_(TXRING_OVERRUN, "tx ring overrun") + +typedef enum +{ +#define _(f,s) AF_PACKET_TX_ERROR_##f, + foreach_af_packet_tx_func_error +#undef _ + AF_PACKET_TX_N_ERROR, +} af_packet_tx_func_error_t; + +static char *af_packet_tx_func_error_strings[] = { +#define _(n,s) s, + foreach_af_packet_tx_func_error +#undef _ +}; + +typedef struct +{ + u32 buffer_index; + u32 hw_if_index; + u16 queue_id; + u8 is_v2; + union + { + tpacket2_hdr_t tph2; + tpacket3_hdr_t tph3; + }; + vnet_virtio_net_hdr_t vnet_hdr; + vlib_buffer_t buffer; +} af_packet_tx_trace_t; + +#ifndef CLIB_MARCH_VARIANT +u8 * +format_af_packet_device_name (u8 * s, va_list * args) +{ + u32 i = va_arg (*args, u32); + af_packet_main_t *apm = &af_packet_main; + af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, i); + + s = format (s, "host-%s", apif->host_if_name); + return s; +} +#endif /* CLIB_MARCH_VARIANT */ + +static u8 * +format_af_packet_device (u8 * s, va_list * args) +{ + u32 dev_instance = va_arg (*args, u32); + u32 indent = format_get_indent (s); + int __clib_unused verbose = va_arg (*args, int); + + af_packet_main_t *apm = &af_packet_main; + af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, dev_instance); + af_packet_queue_t *rx_queue = 0; + af_packet_queue_t *tx_queue = 0; + + s = format (s, "Linux PACKET socket interface %s", + (apif->version == TPACKET_V2) ? "v2" : "v3"); + s = format (s, "\n%UFEATURES:", format_white_space, indent); + if (apif->is_qdisc_bypass_enabled) + s = format (s, "\n%Uqdisc-bpass-enabled", format_white_space, indent + 2); + if (apif->is_cksum_gso_enabled) + s = format (s, "\n%Ucksum-gso-enabled", format_white_space, indent + 2); + if (apif->is_fanout_enabled) + s = format (s, "\n%Ufanout-enabled", format_white_space, indent + 2); + + vec_foreach (rx_queue, apif->rx_queues) + { + u32 rx_block_size = rx_queue->rx_req->req.tp_block_size; + u32 rx_frame_size = rx_queue->rx_req->req.tp_frame_size; + u32 rx_frame_nr = rx_queue->rx_req->req.tp_frame_nr; + u32 rx_block_nr = rx_queue->rx_req->req.tp_block_nr; + + s = format (s, "\n%URX Queue %u:", format_white_space, indent, + rx_queue->queue_id); + s = format (s, "\n%Ublock size:%d nr:%d frame size:%d nr:%d", + format_white_space, indent + 2, rx_block_size, rx_block_nr, + rx_frame_size, rx_frame_nr); + if (apif->version == TPACKET_V2) + s = format (s, " next frame:%d", rx_queue->next_rx_frame); + else + s = format (s, " next block:%d", rx_queue->next_rx_block); + if (rx_queue->is_rx_pending) + { + s = format ( + s, "\n%UPending Request: num-rx-pkts:%d next-frame-offset:%d", + format_white_space, indent + 2, rx_queue->num_rx_pkts, + rx_queue->rx_frame_offset); + } + } + + vec_foreach (tx_queue, apif->tx_queues) + { + clib_spinlock_lock (&tx_queue->lockp); + u32 tx_block_sz = tx_queue->tx_req->req.tp_block_size; + u32 tx_frame_sz = tx_queue->tx_req->req.tp_frame_size; + u32 tx_frame_nr = tx_queue->tx_req->req.tp_frame_nr; + u32 tx_block_nr = tx_queue->tx_req->req.tp_block_nr; + int block = 0; + int n_send_req = 0, n_avail = 0, n_sending = 0, n_tot = 0, n_wrong = 0; + u8 *tx_block_start = tx_queue->tx_ring[block]; + u32 tx_frame = tx_queue->next_tx_frame; + tpacket3_hdr_t *tph3; + tpacket2_hdr_t *tph2; + + s = format (s, "\n%UTX Queue %u:", format_white_space, indent, + tx_queue->queue_id); + s = format (s, "\n%Ublock size:%d nr:%d frame size:%d nr:%d", + format_white_space, indent + 2, tx_block_sz, tx_block_nr, + tx_frame_sz, tx_frame_nr); + s = format (s, " next frame:%d", tx_queue->next_tx_frame); + if (apif->version & TPACKET_V3) + do + { + tph3 = + (tpacket3_hdr_t *) (tx_block_start + tx_frame * tx_frame_sz); + tx_frame = (tx_frame + 1) % tx_frame_nr; + if (tph3->tp_status == 0) + n_avail++; + else if (tph3->tp_status & TP_STATUS_SEND_REQUEST) + n_send_req++; + else if (tph3->tp_status & TP_STATUS_SENDING) + n_sending++; + else + n_wrong++; + n_tot++; + } + while (tx_frame != tx_queue->next_tx_frame); + else + do + { + tph2 = + (tpacket2_hdr_t *) (tx_block_start + tx_frame * tx_frame_sz); + tx_frame = (tx_frame + 1) % tx_frame_nr; + if (tph2->tp_status == 0) + n_avail++; + else if (tph2->tp_status & TP_STATUS_SEND_REQUEST) + n_send_req++; + else if (tph2->tp_status & TP_STATUS_SENDING) + n_sending++; + else + n_wrong++; + n_tot++; + } + while (tx_frame != tx_queue->next_tx_frame); + s = + format (s, "\n%Uavailable:%d request:%d sending:%d wrong:%d total:%d", + format_white_space, indent + 2, n_avail, n_send_req, n_sending, + n_wrong, n_tot); + clib_spinlock_unlock (&tx_queue->lockp); + } + return s; +} + +static u8 * +format_af_packet_tx_trace (u8 *s, va_list *va) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *); + af_packet_tx_trace_t *t = va_arg (*va, af_packet_tx_trace_t *); + u32 indent = format_get_indent (s); + + s = format (s, "af_packet: hw_if_index %u tx-queue %u", t->hw_if_index, + t->queue_id); + + if (t->is_v2) + { + s = format ( + s, + "\n%Utpacket2_hdr:\n%Ustatus 0x%x len %u snaplen %u mac %u net %u" + "\n%Usec 0x%x nsec 0x%x vlan %U" +#ifdef TP_STATUS_VLAN_TPID_VALID + " vlan_tpid %u" +#endif + , + format_white_space, indent + 2, format_white_space, indent + 4, + t->tph2.tp_status, t->tph2.tp_len, t->tph2.tp_snaplen, t->tph2.tp_mac, + t->tph2.tp_net, format_white_space, indent + 4, t->tph2.tp_sec, + t->tph2.tp_nsec, format_ethernet_vlan_tci, t->tph2.tp_vlan_tci +#ifdef TP_STATUS_VLAN_TPID_VALID + , + t->tph2.tp_vlan_tpid +#endif + ); + } + else + { + s = format ( + s, + "\n%Utpacket3_hdr:\n%Ustatus 0x%x len %u snaplen %u mac %u net %u" + "\n%Usec 0x%x nsec 0x%x vlan %U" +#ifdef TP_STATUS_VLAN_TPID_VALID + " vlan_tpid %u" +#endif + , + format_white_space, indent + 2, format_white_space, indent + 4, + t->tph3.tp_status, t->tph3.tp_len, t->tph3.tp_snaplen, t->tph3.tp_mac, + t->tph3.tp_net, format_white_space, indent + 4, t->tph3.tp_sec, + t->tph3.tp_nsec, format_ethernet_vlan_tci, t->tph3.hv1.tp_vlan_tci +#ifdef TP_STATUS_VLAN_TPID_VALID + , + t->tph3.hv1.tp_vlan_tpid +#endif + ); + } + s = format (s, + "\n%Uvnet-hdr:\n%Uflags 0x%02x gso_type 0x%02x hdr_len %u" + "\n%Ugso_size %u csum_start %u csum_offset %u", + format_white_space, indent + 2, format_white_space, indent + 4, + t->vnet_hdr.flags, t->vnet_hdr.gso_type, t->vnet_hdr.hdr_len, + format_white_space, indent + 4, t->vnet_hdr.gso_size, + t->vnet_hdr.csum_start, t->vnet_hdr.csum_offset); + + s = format (s, "\n%Ubuffer 0x%x:\n%U%U", format_white_space, indent + 2, + t->buffer_index, format_white_space, indent + 4, + format_vnet_buffer_no_chain, &t->buffer); + s = format (s, "\n%U%U", format_white_space, indent + 2, + format_ethernet_header_with_length, t->buffer.pre_data, + sizeof (t->buffer.pre_data)); + return s; +} + +static void +af_packet_tx_trace (vlib_main_t *vm, vlib_node_runtime_t *node, + vlib_buffer_t *b0, u32 bi, void *tph, + vnet_virtio_net_hdr_t *vnet_hdr, u32 hw_if_index, + u16 queue_id, u8 is_v2) +{ + af_packet_tx_trace_t *t; + t = vlib_add_trace (vm, node, b0, sizeof (t[0])); + t->hw_if_index = hw_if_index; + t->queue_id = queue_id; + t->buffer_index = bi; + t->is_v2 = is_v2; + + if (is_v2) + clib_memcpy_fast (&t->tph2, (tpacket2_hdr_t *) tph, + sizeof (tpacket2_hdr_t)); + else + clib_memcpy_fast (&t->tph3, (tpacket3_hdr_t *) tph, + sizeof (tpacket3_hdr_t)); + clib_memcpy_fast (&t->vnet_hdr, vnet_hdr, sizeof (*vnet_hdr)); + clib_memcpy_fast (&t->buffer, b0, sizeof (*b0) - sizeof (b0->pre_data)); + clib_memcpy_fast (t->buffer.pre_data, vlib_buffer_get_current (b0), + sizeof (t->buffer.pre_data)); +} + +static_always_inline void +fill_gso_offload (vlib_buffer_t *b0, vnet_virtio_net_hdr_t *vnet_hdr) +{ + vnet_buffer_oflags_t oflags = vnet_buffer (b0)->oflags; + i16 l4_hdr_offset = vnet_buffer (b0)->l4_hdr_offset - b0->current_data; + if (b0->flags & VNET_BUFFER_F_IS_IP4) + { + ip4_header_t *ip4; + vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; + vnet_hdr->gso_size = vnet_buffer2 (b0)->gso_size; + vnet_hdr->hdr_len = l4_hdr_offset + vnet_buffer2 (b0)->gso_l4_hdr_sz; + vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; + vnet_hdr->csum_start = l4_hdr_offset; // 0x22; + vnet_hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); + ip4 = (ip4_header_t *) (b0->data + vnet_buffer (b0)->l3_hdr_offset); + if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM) + ip4->checksum = ip4_header_checksum (ip4); + tcp_header_t *tcp = + (tcp_header_t *) (b0->data + vnet_buffer (b0)->l4_hdr_offset); + tcp->checksum = ip4_pseudo_header_cksum (ip4); + } + else if (b0->flags & VNET_BUFFER_F_IS_IP6) + { + ip6_header_t *ip6; + vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; + vnet_hdr->gso_size = vnet_buffer2 (b0)->gso_size; + vnet_hdr->hdr_len = l4_hdr_offset + vnet_buffer2 (b0)->gso_l4_hdr_sz; + vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; + vnet_hdr->csum_start = l4_hdr_offset; // 0x36; + vnet_hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); + ip6 = (ip6_header_t *) (b0->data + vnet_buffer (b0)->l3_hdr_offset); + tcp_header_t *tcp = + (tcp_header_t *) (b0->data + vnet_buffer (b0)->l4_hdr_offset); + tcp->checksum = ip6_pseudo_header_cksum (ip6); + } +} + +static_always_inline void +fill_cksum_offload (vlib_buffer_t *b0, vnet_virtio_net_hdr_t *vnet_hdr) +{ + vnet_buffer_oflags_t oflags = vnet_buffer (b0)->oflags; + i16 l4_hdr_offset = vnet_buffer (b0)->l4_hdr_offset - b0->current_data; + if (b0->flags & VNET_BUFFER_F_IS_IP4) + { + ip4_header_t *ip4; + ip4 = (ip4_header_t *) (b0->data + vnet_buffer (b0)->l3_hdr_offset); + if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM) + ip4->checksum = ip4_header_checksum (ip4); + vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; + vnet_hdr->csum_start = l4_hdr_offset; + if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM) + { + tcp_header_t *tcp = + (tcp_header_t *) (b0->data + vnet_buffer (b0)->l4_hdr_offset); + tcp->checksum = ip4_pseudo_header_cksum (ip4); + vnet_hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); + vnet_hdr->hdr_len = l4_hdr_offset + tcp_header_bytes (tcp); + } + else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM) + { + udp_header_t *udp = + (udp_header_t *) (b0->data + vnet_buffer (b0)->l4_hdr_offset); + udp->checksum = ip4_pseudo_header_cksum (ip4); + vnet_hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum); + vnet_hdr->hdr_len = l4_hdr_offset + sizeof (udp_header_t); + } + } + else if (b0->flags & VNET_BUFFER_F_IS_IP6) + { + ip6_header_t *ip6; + vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; + vnet_hdr->csum_start = l4_hdr_offset; + ip6 = (ip6_header_t *) (b0->data + vnet_buffer (b0)->l3_hdr_offset); + if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM) + { + tcp_header_t *tcp = + (tcp_header_t *) (b0->data + vnet_buffer (b0)->l4_hdr_offset); + tcp->checksum = ip6_pseudo_header_cksum (ip6); + vnet_hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum); + vnet_hdr->hdr_len = l4_hdr_offset + tcp_header_bytes (tcp); + } + else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM) + { + udp_header_t *udp = + (udp_header_t *) (b0->data + vnet_buffer (b0)->l4_hdr_offset); + udp->checksum = ip6_pseudo_header_cksum (ip6); + vnet_hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum); + vnet_hdr->hdr_len = l4_hdr_offset + sizeof (udp_header_t); + } + } +} + +VNET_DEVICE_CLASS_TX_FN (af_packet_device_class) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + af_packet_main_t *apm = &af_packet_main; + vnet_hw_if_tx_frame_t *tf = vlib_frame_scalar_args (frame); + u32 *buffers = vlib_frame_vector_args (frame); + u32 n_left = frame->n_vectors; + u32 n_sent = 0; + vnet_interface_output_runtime_t *rd = (void *) node->runtime_data; + af_packet_if_t *apif = + pool_elt_at_index (apm->interfaces, rd->dev_instance); + u16 queue_id = tf->queue_id; + af_packet_queue_t *tx_queue = vec_elt_at_index (apif->tx_queues, queue_id); + u32 block = 0, frame_size = 0, frame_num = 0, tx_frame = 0; + u8 *block_start = 0; + tpacket3_hdr_t *tph3 = 0; + tpacket2_hdr_t *tph2 = 0; + u32 frame_not_ready = 0; + u8 is_cksum_gso_enabled = (apif->is_cksum_gso_enabled == 1) ? 1 : 0; + u32 tpacket_align = 0; + u8 is_v2 = (apif->version == TPACKET_V2) ? 1 : 0; + + if (tf->shared_queue) + clib_spinlock_lock (&tx_queue->lockp); + + frame_size = tx_queue->tx_req->req.tp_frame_size; + frame_num = tx_queue->tx_req->req.tp_frame_nr; + block_start = tx_queue->tx_ring[block]; + tx_frame = tx_queue->next_tx_frame; + if (is_v2) + { + tpacket_align = TPACKET_ALIGN (sizeof (tpacket2_hdr_t)); + while (n_left) + { + u32 len; + vnet_virtio_net_hdr_t *vnet_hdr = 0; + u32 offset = 0; + vlib_buffer_t *b0 = 0, *b0_first = 0; + u32 bi, bi_first; + + bi = bi_first = buffers[0]; + n_left--; + buffers++; + + tph2 = (tpacket2_hdr_t *) (block_start + tx_frame * frame_size); + if (PREDICT_FALSE (tph2->tp_status & + (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING))) + { + frame_not_ready++; + goto nextv2; + } + + b0_first = b0 = vlib_get_buffer (vm, bi); + + if (PREDICT_TRUE (is_cksum_gso_enabled)) + { + vnet_hdr = + (vnet_virtio_net_hdr_t *) ((u8 *) tph2 + tpacket_align); + + clib_memset_u8 (vnet_hdr, 0, sizeof (vnet_virtio_net_hdr_t)); + offset = sizeof (vnet_virtio_net_hdr_t); + + if (b0->flags & VNET_BUFFER_F_GSO) + fill_gso_offload (b0, vnet_hdr); + else if (b0->flags & VNET_BUFFER_F_OFFLOAD) + fill_cksum_offload (b0, vnet_hdr); + } + + len = b0->current_length; + clib_memcpy_fast ((u8 *) tph2 + tpacket_align + offset, + vlib_buffer_get_current (b0), len); + offset += len; + + while (b0->flags & VLIB_BUFFER_NEXT_PRESENT) + { + b0 = vlib_get_buffer (vm, b0->next_buffer); + len = b0->current_length; + clib_memcpy_fast ((u8 *) tph2 + tpacket_align + offset, + vlib_buffer_get_current (b0), len); + offset += len; + } + + tph2->tp_len = tph2->tp_snaplen = offset; + tph2->tp_status = TP_STATUS_SEND_REQUEST; + n_sent++; + + if (PREDICT_FALSE (b0_first->flags & VLIB_BUFFER_IS_TRACED)) + { + if (PREDICT_TRUE (is_cksum_gso_enabled)) + af_packet_tx_trace (vm, node, b0_first, bi_first, tph2, + vnet_hdr, apif->hw_if_index, queue_id, 1); + else + { + vnet_virtio_net_hdr_t vnet_hdr2 = {}; + af_packet_tx_trace (vm, node, b0_first, bi_first, tph2, + &vnet_hdr2, apif->hw_if_index, queue_id, + 1); + } + } + tx_frame = (tx_frame + 1) % frame_num; + + nextv2: + /* check if we've exhausted the ring */ + if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num)) + break; + } + } + else + { + tpacket_align = TPACKET_ALIGN (sizeof (tpacket3_hdr_t)); + + while (n_left) + { + u32 len; + vnet_virtio_net_hdr_t *vnet_hdr = 0; + u32 offset = 0; + vlib_buffer_t *b0 = 0, *b0_first = 0; + u32 bi, bi_first; + + bi = bi_first = buffers[0]; + n_left--; + buffers++; + + tph3 = (tpacket3_hdr_t *) (block_start + tx_frame * frame_size); + if (PREDICT_FALSE (tph3->tp_status & + (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING))) + { + frame_not_ready++; + goto nextv3; + } + + b0_first = b0 = vlib_get_buffer (vm, bi); + + if (PREDICT_TRUE (is_cksum_gso_enabled)) + { + vnet_hdr = + (vnet_virtio_net_hdr_t *) ((u8 *) tph3 + tpacket_align); + + clib_memset_u8 (vnet_hdr, 0, sizeof (vnet_virtio_net_hdr_t)); + offset = sizeof (vnet_virtio_net_hdr_t); + + if (b0->flags & VNET_BUFFER_F_GSO) + fill_gso_offload (b0, vnet_hdr); + else if (b0->flags & VNET_BUFFER_F_OFFLOAD) + fill_cksum_offload (b0, vnet_hdr); + } + + len = b0->current_length; + clib_memcpy_fast ((u8 *) tph3 + tpacket_align + offset, + vlib_buffer_get_current (b0), len); + offset += len; + + while (b0->flags & VLIB_BUFFER_NEXT_PRESENT) + { + b0 = vlib_get_buffer (vm, b0->next_buffer); + len = b0->current_length; + clib_memcpy_fast ((u8 *) tph3 + tpacket_align + offset, + vlib_buffer_get_current (b0), len); + offset += len; + } + + tph3->tp_len = tph3->tp_snaplen = offset; + tph3->tp_status = TP_STATUS_SEND_REQUEST; + n_sent++; + + if (PREDICT_FALSE (b0_first->flags & VLIB_BUFFER_IS_TRACED)) + { + if (PREDICT_TRUE (is_cksum_gso_enabled)) + af_packet_tx_trace (vm, node, b0_first, bi_first, tph3, + vnet_hdr, apif->hw_if_index, queue_id, 0); + else + { + vnet_virtio_net_hdr_t vnet_hdr2 = {}; + af_packet_tx_trace (vm, node, b0_first, bi_first, tph3, + &vnet_hdr2, apif->hw_if_index, queue_id, + 0); + } + } + tx_frame = (tx_frame + 1) % frame_num; + + nextv3: + /* check if we've exhausted the ring */ + if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num)) + break; + } + } + CLIB_MEMORY_BARRIER (); + + if (PREDICT_TRUE (n_sent || tx_queue->is_tx_pending)) + { + tx_queue->next_tx_frame = tx_frame; + tx_queue->is_tx_pending = 0; + + if (PREDICT_FALSE ( + sendto (tx_queue->fd, NULL, 0, MSG_DONTWAIT, NULL, 0) == -1)) + { + /* Uh-oh, drop & move on, but count whether it was fatal or not. + * Note that we have no reliable way to properly determine the + * disposition of the packets we just enqueued for delivery. + */ + uword counter; + + if (unix_error_is_fatal (errno)) + { + counter = AF_PACKET_TX_ERROR_TXRING_FATAL; + } + else + { + counter = AF_PACKET_TX_ERROR_TXRING_EAGAIN; + /* non-fatal error: kick again next time + * note that you could still end up in a deadlock: if you do not + * try to send new packets (ie reschedule this tx node), eg. + * because your peer is waiting for the unsent packets to reply + * to you but your waiting for its reply etc., you are not going + * to kick again, and everybody is waiting for the other to talk + * 1st... */ + tx_queue->is_tx_pending = 1; + } + + vlib_error_count (vm, node->node_index, counter, 1); + } + } + + if (tf->shared_queue) + clib_spinlock_unlock (&tx_queue->lockp); + + if (PREDICT_FALSE (frame_not_ready)) + vlib_error_count (vm, node->node_index, + AF_PACKET_TX_ERROR_FRAME_NOT_READY, frame_not_ready); + + if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num)) + vlib_error_count (vm, node->node_index, AF_PACKET_TX_ERROR_TXRING_OVERRUN, + n_left); + + vlib_buffer_free (vm, vlib_frame_vector_args (frame), frame->n_vectors); + return frame->n_vectors; +} + +static void +af_packet_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index, + u32 node_index) +{ + af_packet_main_t *apm = &af_packet_main; + vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index); + af_packet_if_t *apif = + pool_elt_at_index (apm->interfaces, hw->dev_instance); + + /* Shut off redirection */ + if (node_index == ~0) + { + apif->per_interface_next_index = node_index; + return; + } + + apif->per_interface_next_index = + vlib_node_add_next (vlib_get_main (), af_packet_input_node.index, + node_index); +} + +static void +af_packet_clear_hw_interface_counters (u32 instance) +{ + /* Nothing for now */ +} + +static clib_error_t * +af_packet_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, + u32 flags) +{ + af_packet_main_t *apm = &af_packet_main; + vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index); + af_packet_if_t *apif = + pool_elt_at_index (apm->interfaces, hw->dev_instance); + u32 hw_flags; + + if (apif->host_if_index < 0) + return 0; /* no error */ + + apif->is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0; + + if (apif->is_admin_up) + { + hw_flags = VNET_HW_INTERFACE_FLAG_LINK_UP; + vnet_netlink_set_link_state (apif->host_if_index, 1); + } + else + { + hw_flags = 0; + vnet_netlink_set_link_state (apif->host_if_index, 0); + } + + vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags); + + return 0; /* no error */ +} + +static clib_error_t *af_packet_set_mac_address_function + (struct vnet_hw_interface_t *hi, const u8 * old_address, const u8 * address) +{ + af_packet_main_t *apm = &af_packet_main; + af_packet_if_t *apif = + pool_elt_at_index (apm->interfaces, hi->dev_instance); + int rv, fd; + struct ifreq ifr; + + if (apif->mode == AF_PACKET_IF_MODE_IP) + { + vlib_log_warn (apm->log_class, "af_packet_%s interface is in IP mode", + apif->host_if_name); + return clib_error_return (0, + " MAC update failed, interface is in IP mode"); + } + + fd = socket (AF_UNIX, SOCK_DGRAM, 0); + if (0 > fd) + { + vlib_log_warn (apm->log_class, "af_packet_%s could not open socket", + apif->host_if_name); + return 0; + } + + /* if interface is a bridge ignore */ + if (apif->host_if_index < 0) + goto error; /* no error */ + + /* use host_if_index in case host name has changed */ + ifr.ifr_ifindex = apif->host_if_index; + if ((rv = ioctl (fd, SIOCGIFNAME, &ifr)) < 0) + { + vlib_log_warn + (apm->log_class, + "af_packet_%s ioctl could not retrieve eth name, error: %d", + apif->host_if_name, rv); + goto error; + } + + clib_memcpy (ifr.ifr_hwaddr.sa_data, address, 6); + ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER; + + if ((rv = ioctl (fd, SIOCSIFHWADDR, &ifr)) < 0) + { + vlib_log_warn (apm->log_class, + "af_packet_%s ioctl could not set mac, error: %d", + apif->host_if_name, rv); + goto error; + } + +error: + + if (0 <= fd) + close (fd); + + return 0; /* no error */ +} + +static clib_error_t * +af_packet_interface_rx_mode_change (vnet_main_t *vnm, u32 hw_if_index, u32 qid, + vnet_hw_if_rx_mode mode) +{ + af_packet_main_t *apm = &af_packet_main; + vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index); + af_packet_if_t *apif; + + apif = vec_elt_at_index (apm->interfaces, hw->dev_instance); + + if (mode == VNET_HW_IF_RX_MODE_ADAPTIVE) + { + vlib_log_err (apm->log_class, + "af_packet_%s adaptive mode is not supported", + apif->host_if_name); + return clib_error_return ( + 0, "af_packet_%s adaptive mode is not supported", apif->host_if_name); + } + + af_packet_queue_t *rx_queue = vec_elt_at_index (apif->rx_queues, qid); + + if (rx_queue->mode != mode) + { + rx_queue->mode = mode; + + if (mode == VNET_HW_IF_RX_MODE_POLLING) + apm->polling_count++; + else if (mode == VNET_HW_IF_RX_MODE_INTERRUPT && apm->polling_count > 0) + apm->polling_count--; + } + + return 0; +} + +VNET_DEVICE_CLASS (af_packet_device_class) = { + .name = "af-packet", + .format_device_name = format_af_packet_device_name, + .format_device = format_af_packet_device, + .format_tx_trace = format_af_packet_tx_trace, + .tx_function_n_errors = AF_PACKET_TX_N_ERROR, + .tx_function_error_strings = af_packet_tx_func_error_strings, + .rx_redirect_to_node = af_packet_set_interface_next_node, + .clear_counters = af_packet_clear_hw_interface_counters, + .admin_up_down_function = af_packet_interface_admin_up_down, + .mac_addr_change_function = af_packet_set_mac_address_function, + .rx_mode_change_function = af_packet_interface_rx_mode_change, +}; + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |