mirror of
https://github.com/openvswitch/ovs
synced 2025-08-22 18:07:40 +00:00
aebdcb93e0
Currently the flow key is updated to match an action that is applied to a packet but these field are never looked at again. Not only is this a waste of time it also makes optimizations involving caching the flow key more difficult.
1372 lines
36 KiB
C
1372 lines
36 KiB
C
/*
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* Copyright (c) 2009, 2010 Nicira Networks.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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#include "dpif.h"
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "csum.h"
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#include "dpif-provider.h"
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#include "flow.h"
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#include "hmap.h"
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#include "list.h"
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#include "netdev.h"
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#include "odp-util.h"
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#include "ofp-print.h"
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#include "ofpbuf.h"
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#include "packets.h"
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#include "poll-loop.h"
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#include "queue.h"
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#include "timeval.h"
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#include "util.h"
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#include "vlog.h"
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#define THIS_MODULE VLM_dpif_netdev
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/* Configuration parameters. */
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enum { N_QUEUES = 2 }; /* Number of queues for dpif_recv(). */
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enum { MAX_QUEUE_LEN = 100 }; /* Maximum number of packets per queue. */
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enum { N_GROUPS = 16 }; /* Number of port groups. */
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enum { MAX_PORTS = 256 }; /* Maximum number of ports. */
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enum { MAX_FLOWS = 65536 }; /* Maximum number of flows in flow table. */
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/* Enough headroom to add a vlan tag, plus an extra 2 bytes to allow IP
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* headers to be aligned on a 4-byte boundary. */
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enum { DP_NETDEV_HEADROOM = 2 + VLAN_HEADER_LEN };
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/* Datapath based on the network device interface from netdev.h. */
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struct dp_netdev {
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struct list node;
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int dp_idx;
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int open_cnt;
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bool destroyed;
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bool drop_frags; /* Drop all IP fragments, if true. */
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struct ovs_queue queues[N_QUEUES]; /* Messages queued for dpif_recv(). */
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struct hmap flow_table; /* Flow table. */
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struct odp_port_group groups[N_GROUPS];
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/* Statistics. */
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long long int n_frags; /* Number of dropped IP fragments. */
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long long int n_hit; /* Number of flow table matches. */
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long long int n_missed; /* Number of flow table misses. */
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long long int n_lost; /* Number of misses not passed to client. */
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/* Ports. */
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int n_ports;
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struct dp_netdev_port *ports[MAX_PORTS];
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struct list port_list;
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unsigned int serial;
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};
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/* A port in a netdev-based datapath. */
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struct dp_netdev_port {
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int port_no; /* Index into dp_netdev's 'ports'. */
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struct list node; /* Element in dp_netdev's 'port_list'. */
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struct netdev *netdev;
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bool internal; /* Internal port (as ODP_PORT_INTERNAL)? */
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};
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/* A flow in dp_netdev's 'flow_table'. */
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struct dp_netdev_flow {
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struct hmap_node node; /* Element in dp_netdev's 'flow_table'. */
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flow_t key;
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/* Statistics. */
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struct timespec used; /* Last used time. */
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long long int packet_count; /* Number of packets matched. */
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long long int byte_count; /* Number of bytes matched. */
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uint8_t ip_tos; /* IP TOS value. */
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uint16_t tcp_ctl; /* Bitwise-OR of seen tcp_ctl values. */
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/* Actions. */
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union odp_action *actions;
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unsigned int n_actions;
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};
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/* Interface to netdev-based datapath. */
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struct dpif_netdev {
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struct dpif dpif;
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struct dp_netdev *dp;
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int listen_mask;
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unsigned int dp_serial;
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};
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/* All netdev-based datapaths. */
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static struct dp_netdev *dp_netdevs[256];
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struct list dp_netdev_list = LIST_INITIALIZER(&dp_netdev_list);
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enum { N_DP_NETDEVS = ARRAY_SIZE(dp_netdevs) };
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/* Maximum port MTU seen so far. */
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static int max_mtu = ETH_PAYLOAD_MAX;
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static int get_port_by_number(struct dp_netdev *, uint16_t port_no,
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struct dp_netdev_port **portp);
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static int get_port_by_name(struct dp_netdev *, const char *devname,
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struct dp_netdev_port **portp);
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static void dp_netdev_free(struct dp_netdev *);
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static void dp_netdev_flow_flush(struct dp_netdev *);
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static int do_add_port(struct dp_netdev *, const char *devname, uint16_t flags,
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uint16_t port_no);
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static int do_del_port(struct dp_netdev *, uint16_t port_no);
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static int dp_netdev_output_control(struct dp_netdev *, const struct ofpbuf *,
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int queue_no, int port_no, uint32_t arg);
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static int dp_netdev_execute_actions(struct dp_netdev *,
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struct ofpbuf *, const flow_t *,
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const union odp_action *, int n);
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static struct dpif_netdev *
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dpif_netdev_cast(const struct dpif *dpif)
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{
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dpif_assert_class(dpif, &dpif_netdev_class);
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return CONTAINER_OF(dpif, struct dpif_netdev, dpif);
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}
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static struct dp_netdev *
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get_dp_netdev(const struct dpif *dpif)
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{
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return dpif_netdev_cast(dpif)->dp;
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}
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static int
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name_to_dp_idx(const char *name)
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{
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if (!strncmp(name, "dp", 2) && isdigit((unsigned char)name[2])) {
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int dp_idx = atoi(name + 2);
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if (dp_idx >= 0 && dp_idx < N_DP_NETDEVS) {
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return dp_idx;
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}
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}
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return -1;
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}
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static struct dp_netdev *
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find_dp_netdev(const char *name)
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{
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int dp_idx;
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size_t i;
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dp_idx = name_to_dp_idx(name);
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if (dp_idx >= 0) {
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return dp_netdevs[dp_idx];
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}
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for (i = 0; i < N_DP_NETDEVS; i++) {
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struct dp_netdev *dp = dp_netdevs[i];
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if (dp) {
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struct dp_netdev_port *port;
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if (!get_port_by_name(dp, name, &port)) {
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return dp;
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}
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}
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}
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return NULL;
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}
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static struct dpif *
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create_dpif_netdev(struct dp_netdev *dp)
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{
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struct dpif_netdev *dpif;
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char *dpname;
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dp->open_cnt++;
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dpname = xasprintf("dp%d", dp->dp_idx);
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dpif = xmalloc(sizeof *dpif);
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dpif_init(&dpif->dpif, &dpif_netdev_class, dpname, dp->dp_idx, dp->dp_idx);
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dpif->dp = dp;
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dpif->listen_mask = 0;
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dpif->dp_serial = dp->serial;
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free(dpname);
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return &dpif->dpif;
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}
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static int
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create_dp_netdev(const char *name, int dp_idx, struct dpif **dpifp)
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{
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struct dp_netdev *dp;
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int error;
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int i;
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if (dp_netdevs[dp_idx]) {
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return EBUSY;
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}
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/* Create datapath. */
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dp_netdevs[dp_idx] = dp = xzalloc(sizeof *dp);
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list_push_back(&dp_netdev_list, &dp->node);
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dp->dp_idx = dp_idx;
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dp->open_cnt = 0;
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dp->drop_frags = false;
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for (i = 0; i < N_QUEUES; i++) {
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queue_init(&dp->queues[i]);
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}
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hmap_init(&dp->flow_table);
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for (i = 0; i < N_GROUPS; i++) {
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dp->groups[i].ports = NULL;
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dp->groups[i].n_ports = 0;
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dp->groups[i].group = i;
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}
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list_init(&dp->port_list);
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error = do_add_port(dp, name, ODP_PORT_INTERNAL, ODPP_LOCAL);
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if (error) {
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dp_netdev_free(dp);
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return ENODEV;
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}
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*dpifp = create_dpif_netdev(dp);
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return 0;
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}
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static int
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dpif_netdev_open(const char *name, const char *type OVS_UNUSED, bool create,
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struct dpif **dpifp)
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{
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if (create) {
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if (find_dp_netdev(name)) {
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return EEXIST;
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} else {
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int dp_idx = name_to_dp_idx(name);
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if (dp_idx >= 0) {
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return create_dp_netdev(name, dp_idx, dpifp);
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} else {
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/* Scan for unused dp_idx number. */
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for (dp_idx = 0; dp_idx < N_DP_NETDEVS; dp_idx++) {
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int error = create_dp_netdev(name, dp_idx, dpifp);
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if (error != EBUSY) {
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return error;
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}
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}
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/* All datapath numbers in use. */
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return ENOBUFS;
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}
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}
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} else {
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struct dp_netdev *dp = find_dp_netdev(name);
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if (dp) {
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*dpifp = create_dpif_netdev(dp);
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return 0;
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} else {
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return ENODEV;
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}
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}
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}
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static void
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dp_netdev_free(struct dp_netdev *dp)
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{
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int i;
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dp_netdev_flow_flush(dp);
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while (dp->n_ports > 0) {
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struct dp_netdev_port *port = CONTAINER_OF(
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dp->port_list.next, struct dp_netdev_port, node);
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do_del_port(dp, port->port_no);
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}
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for (i = 0; i < N_QUEUES; i++) {
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queue_destroy(&dp->queues[i]);
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}
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hmap_destroy(&dp->flow_table);
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for (i = 0; i < N_GROUPS; i++) {
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free(dp->groups[i].ports);
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}
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dp_netdevs[dp->dp_idx] = NULL;
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list_remove(&dp->node);
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free(dp);
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}
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static void
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dpif_netdev_close(struct dpif *dpif)
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{
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struct dp_netdev *dp = get_dp_netdev(dpif);
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assert(dp->open_cnt > 0);
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if (--dp->open_cnt == 0 && dp->destroyed) {
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dp_netdev_free(dp);
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}
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free(dpif);
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}
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static int
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dpif_netdev_destroy(struct dpif *dpif)
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{
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struct dp_netdev *dp = get_dp_netdev(dpif);
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dp->destroyed = true;
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return 0;
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}
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static int
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dpif_netdev_get_stats(const struct dpif *dpif, struct odp_stats *stats)
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{
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struct dp_netdev *dp = get_dp_netdev(dpif);
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memset(stats, 0, sizeof *stats);
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stats->n_flows = hmap_count(&dp->flow_table);
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stats->cur_capacity = hmap_capacity(&dp->flow_table);
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stats->max_capacity = MAX_FLOWS;
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stats->n_ports = dp->n_ports;
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stats->max_ports = MAX_PORTS;
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stats->max_groups = N_GROUPS;
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stats->n_frags = dp->n_frags;
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stats->n_hit = dp->n_hit;
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stats->n_missed = dp->n_missed;
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stats->n_lost = dp->n_lost;
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stats->max_miss_queue = MAX_QUEUE_LEN;
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stats->max_action_queue = MAX_QUEUE_LEN;
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return 0;
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}
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static int
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dpif_netdev_get_drop_frags(const struct dpif *dpif, bool *drop_fragsp)
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{
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struct dp_netdev *dp = get_dp_netdev(dpif);
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*drop_fragsp = dp->drop_frags;
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return 0;
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}
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static int
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dpif_netdev_set_drop_frags(struct dpif *dpif, bool drop_frags)
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{
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struct dp_netdev *dp = get_dp_netdev(dpif);
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dp->drop_frags = drop_frags;
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return 0;
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}
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static int
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do_add_port(struct dp_netdev *dp, const char *devname, uint16_t flags,
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uint16_t port_no)
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{
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bool internal = (flags & ODP_PORT_INTERNAL) != 0;
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struct dp_netdev_port *port;
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struct netdev_options netdev_options;
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struct netdev *netdev;
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int mtu;
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int error;
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/* XXX reject devices already in some dp_netdev. */
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/* Open and validate network device. */
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memset(&netdev_options, 0, sizeof netdev_options);
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netdev_options.name = devname;
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netdev_options.ethertype = NETDEV_ETH_TYPE_ANY;
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if (internal) {
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netdev_options.type = "tap";
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}
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error = netdev_open(&netdev_options, &netdev);
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if (error) {
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return error;
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}
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/* XXX reject loopback devices */
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/* XXX reject non-Ethernet devices */
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error = netdev_turn_flags_on(netdev, NETDEV_PROMISC, false);
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if (error) {
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netdev_close(netdev);
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return error;
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}
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port = xmalloc(sizeof *port);
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port->port_no = port_no;
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port->netdev = netdev;
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port->internal = internal;
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netdev_get_mtu(netdev, &mtu);
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if (mtu > max_mtu) {
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max_mtu = mtu;
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}
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list_push_back(&dp->port_list, &port->node);
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dp->ports[port_no] = port;
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dp->n_ports++;
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dp->serial++;
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return 0;
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}
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static int
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dpif_netdev_port_add(struct dpif *dpif, const char *devname, uint16_t flags,
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uint16_t *port_nop)
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{
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struct dp_netdev *dp = get_dp_netdev(dpif);
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int port_no;
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for (port_no = 0; port_no < MAX_PORTS; port_no++) {
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if (!dp->ports[port_no]) {
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*port_nop = port_no;
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return do_add_port(dp, devname, flags, port_no);
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}
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}
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return EFBIG;
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}
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static int
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dpif_netdev_port_del(struct dpif *dpif, uint16_t port_no)
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{
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struct dp_netdev *dp = get_dp_netdev(dpif);
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return port_no == ODPP_LOCAL ? EINVAL : do_del_port(dp, port_no);
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}
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static bool
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is_valid_port_number(uint16_t port_no)
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{
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return port_no < MAX_PORTS;
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}
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static int
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get_port_by_number(struct dp_netdev *dp,
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uint16_t port_no, struct dp_netdev_port **portp)
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{
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if (!is_valid_port_number(port_no)) {
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*portp = NULL;
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return EINVAL;
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} else {
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*portp = dp->ports[port_no];
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return *portp ? 0 : ENOENT;
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}
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}
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static int
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get_port_by_name(struct dp_netdev *dp,
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const char *devname, struct dp_netdev_port **portp)
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{
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struct dp_netdev_port *port;
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LIST_FOR_EACH (port, struct dp_netdev_port, node, &dp->port_list) {
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if (!strcmp(netdev_get_name(port->netdev), devname)) {
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*portp = port;
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return 0;
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}
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}
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return ENOENT;
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}
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|
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static int
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do_del_port(struct dp_netdev *dp, uint16_t port_no)
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{
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struct dp_netdev_port *port;
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char *name;
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int error;
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error = get_port_by_number(dp, port_no, &port);
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if (error) {
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return error;
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}
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list_remove(&port->node);
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dp->ports[port->port_no] = NULL;
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dp->n_ports--;
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dp->serial++;
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name = xstrdup(netdev_get_name(port->netdev));
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netdev_close(port->netdev);
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free(name);
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free(port);
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return 0;
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}
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static void
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answer_port_query(const struct dp_netdev_port *port, struct odp_port *odp_port)
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{
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memset(odp_port, 0, sizeof *odp_port);
|
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ovs_strlcpy(odp_port->devname, netdev_get_name(port->netdev),
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sizeof odp_port->devname);
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odp_port->port = port->port_no;
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odp_port->flags = port->internal ? ODP_PORT_INTERNAL : 0;
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}
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|
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static int
|
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dpif_netdev_port_query_by_number(const struct dpif *dpif, uint16_t port_no,
|
||
struct odp_port *odp_port)
|
||
{
|
||
struct dp_netdev *dp = get_dp_netdev(dpif);
|
||
struct dp_netdev_port *port;
|
||
int error;
|
||
|
||
error = get_port_by_number(dp, port_no, &port);
|
||
if (!error) {
|
||
answer_port_query(port, odp_port);
|
||
}
|
||
return error;
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_port_query_by_name(const struct dpif *dpif, const char *devname,
|
||
struct odp_port *odp_port)
|
||
{
|
||
struct dp_netdev *dp = get_dp_netdev(dpif);
|
||
struct dp_netdev_port *port;
|
||
int error;
|
||
|
||
error = get_port_by_name(dp, devname, &port);
|
||
if (!error) {
|
||
answer_port_query(port, odp_port);
|
||
}
|
||
return error;
|
||
}
|
||
|
||
static void
|
||
dp_netdev_free_flow(struct dp_netdev *dp, struct dp_netdev_flow *flow)
|
||
{
|
||
hmap_remove(&dp->flow_table, &flow->node);
|
||
free(flow->actions);
|
||
free(flow);
|
||
}
|
||
|
||
static void
|
||
dp_netdev_flow_flush(struct dp_netdev *dp)
|
||
{
|
||
struct dp_netdev_flow *flow, *next;
|
||
|
||
HMAP_FOR_EACH_SAFE (flow, next, struct dp_netdev_flow, node,
|
||
&dp->flow_table) {
|
||
dp_netdev_free_flow(dp, flow);
|
||
}
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_flow_flush(struct dpif *dpif)
|
||
{
|
||
struct dp_netdev *dp = get_dp_netdev(dpif);
|
||
dp_netdev_flow_flush(dp);
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_port_list(const struct dpif *dpif, struct odp_port *ports, int n)
|
||
{
|
||
struct dp_netdev *dp = get_dp_netdev(dpif);
|
||
struct dp_netdev_port *port;
|
||
int i;
|
||
|
||
i = 0;
|
||
LIST_FOR_EACH (port, struct dp_netdev_port, node, &dp->port_list) {
|
||
struct odp_port *odp_port = &ports[i];
|
||
if (i >= n) {
|
||
break;
|
||
}
|
||
answer_port_query(port, odp_port);
|
||
i++;
|
||
}
|
||
return dp->n_ports;
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_port_poll(const struct dpif *dpif_, char **devnamep OVS_UNUSED)
|
||
{
|
||
struct dpif_netdev *dpif = dpif_netdev_cast(dpif_);
|
||
if (dpif->dp_serial != dpif->dp->serial) {
|
||
dpif->dp_serial = dpif->dp->serial;
|
||
return ENOBUFS;
|
||
} else {
|
||
return EAGAIN;
|
||
}
|
||
}
|
||
|
||
static void
|
||
dpif_netdev_port_poll_wait(const struct dpif *dpif_)
|
||
{
|
||
struct dpif_netdev *dpif = dpif_netdev_cast(dpif_);
|
||
if (dpif->dp_serial != dpif->dp->serial) {
|
||
poll_immediate_wake();
|
||
}
|
||
}
|
||
|
||
static int
|
||
get_port_group(const struct dpif *dpif, int group_no,
|
||
struct odp_port_group **groupp)
|
||
{
|
||
struct dp_netdev *dp = get_dp_netdev(dpif);
|
||
|
||
if (group_no >= 0 && group_no < N_GROUPS) {
|
||
*groupp = &dp->groups[group_no];
|
||
return 0;
|
||
} else {
|
||
*groupp = NULL;
|
||
return EINVAL;
|
||
}
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_port_group_get(const struct dpif *dpif, int group_no,
|
||
uint16_t ports[], int n)
|
||
{
|
||
struct odp_port_group *group;
|
||
int error;
|
||
|
||
if (n < 0) {
|
||
return -EINVAL;
|
||
}
|
||
|
||
error = get_port_group(dpif, group_no, &group);
|
||
if (!error) {
|
||
memcpy(ports, group->ports, MIN(n, group->n_ports) * sizeof *ports);
|
||
return group->n_ports;
|
||
} else {
|
||
return -error;
|
||
}
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_port_group_set(struct dpif *dpif, int group_no,
|
||
const uint16_t ports[], int n)
|
||
{
|
||
struct odp_port_group *group;
|
||
int error;
|
||
|
||
if (n < 0 || n > MAX_PORTS) {
|
||
return EINVAL;
|
||
}
|
||
|
||
error = get_port_group(dpif, group_no, &group);
|
||
if (!error) {
|
||
free(group->ports);
|
||
group->ports = xmemdup(ports, n * sizeof *group->ports);
|
||
group->n_ports = n;
|
||
group->group = group_no;
|
||
}
|
||
return error;
|
||
}
|
||
|
||
static struct dp_netdev_flow *
|
||
dp_netdev_lookup_flow(const struct dp_netdev *dp, const flow_t *key)
|
||
{
|
||
struct dp_netdev_flow *flow;
|
||
|
||
assert(!key->reserved[0] && !key->reserved[1] && !key->reserved[2]);
|
||
HMAP_FOR_EACH_WITH_HASH (flow, struct dp_netdev_flow, node,
|
||
flow_hash(key, 0), &dp->flow_table) {
|
||
if (flow_equal(&flow->key, key)) {
|
||
return flow;
|
||
}
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
static void
|
||
answer_flow_query(struct dp_netdev_flow *flow, uint32_t query_flags,
|
||
struct odp_flow *odp_flow)
|
||
{
|
||
if (flow) {
|
||
odp_flow->key = flow->key;
|
||
odp_flow->stats.n_packets = flow->packet_count;
|
||
odp_flow->stats.n_bytes = flow->byte_count;
|
||
odp_flow->stats.used_sec = flow->used.tv_sec;
|
||
odp_flow->stats.used_nsec = flow->used.tv_nsec;
|
||
odp_flow->stats.tcp_flags = TCP_FLAGS(flow->tcp_ctl);
|
||
odp_flow->stats.ip_tos = flow->ip_tos;
|
||
odp_flow->stats.error = 0;
|
||
if (odp_flow->n_actions > 0) {
|
||
unsigned int n = MIN(odp_flow->n_actions, flow->n_actions);
|
||
memcpy(odp_flow->actions, flow->actions,
|
||
n * sizeof *odp_flow->actions);
|
||
odp_flow->n_actions = flow->n_actions;
|
||
}
|
||
|
||
if (query_flags & ODPFF_ZERO_TCP_FLAGS) {
|
||
flow->tcp_ctl = 0;
|
||
}
|
||
|
||
} else {
|
||
odp_flow->stats.error = ENOENT;
|
||
}
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_flow_get(const struct dpif *dpif, struct odp_flow flows[], int n)
|
||
{
|
||
struct dp_netdev *dp = get_dp_netdev(dpif);
|
||
int i;
|
||
|
||
for (i = 0; i < n; i++) {
|
||
struct odp_flow *odp_flow = &flows[i];
|
||
answer_flow_query(dp_netdev_lookup_flow(dp, &odp_flow->key),
|
||
odp_flow->flags, odp_flow);
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_validate_actions(const union odp_action *actions, int n_actions,
|
||
bool *mutates)
|
||
{
|
||
unsigned int i;
|
||
|
||
*mutates = false;
|
||
for (i = 0; i < n_actions; i++) {
|
||
const union odp_action *a = &actions[i];
|
||
switch (a->type) {
|
||
case ODPAT_OUTPUT:
|
||
if (a->output.port >= MAX_PORTS) {
|
||
return EINVAL;
|
||
}
|
||
break;
|
||
|
||
case ODPAT_OUTPUT_GROUP:
|
||
*mutates = true;
|
||
if (a->output_group.group >= N_GROUPS) {
|
||
return EINVAL;
|
||
}
|
||
break;
|
||
|
||
case ODPAT_CONTROLLER:
|
||
break;
|
||
|
||
case ODPAT_SET_VLAN_VID:
|
||
*mutates = true;
|
||
if (a->vlan_vid.vlan_vid & htons(~VLAN_VID_MASK)) {
|
||
return EINVAL;
|
||
}
|
||
break;
|
||
|
||
case ODPAT_SET_VLAN_PCP:
|
||
*mutates = true;
|
||
if (a->vlan_pcp.vlan_pcp & ~(VLAN_PCP_MASK >> VLAN_PCP_SHIFT)) {
|
||
return EINVAL;
|
||
}
|
||
break;
|
||
|
||
case ODPAT_SET_NW_TOS:
|
||
*mutates = true;
|
||
if (a->nw_tos.nw_tos & IP_ECN_MASK) {
|
||
return EINVAL;
|
||
}
|
||
break;
|
||
|
||
case ODPAT_STRIP_VLAN:
|
||
case ODPAT_SET_DL_SRC:
|
||
case ODPAT_SET_DL_DST:
|
||
case ODPAT_SET_NW_SRC:
|
||
case ODPAT_SET_NW_DST:
|
||
case ODPAT_SET_TP_SRC:
|
||
case ODPAT_SET_TP_DST:
|
||
*mutates = true;
|
||
break;
|
||
|
||
default:
|
||
return EOPNOTSUPP;
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
set_flow_actions(struct dp_netdev_flow *flow, struct odp_flow *odp_flow)
|
||
{
|
||
size_t n_bytes;
|
||
bool mutates;
|
||
int error;
|
||
|
||
if (odp_flow->n_actions >= 4096 / sizeof *odp_flow->actions) {
|
||
return EINVAL;
|
||
}
|
||
error = dpif_netdev_validate_actions(odp_flow->actions,
|
||
odp_flow->n_actions, &mutates);
|
||
if (error) {
|
||
return error;
|
||
}
|
||
|
||
n_bytes = odp_flow->n_actions * sizeof *flow->actions;
|
||
flow->actions = xrealloc(flow->actions, n_bytes);
|
||
flow->n_actions = odp_flow->n_actions;
|
||
memcpy(flow->actions, odp_flow->actions, n_bytes);
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
add_flow(struct dpif *dpif, struct odp_flow *odp_flow)
|
||
{
|
||
struct dp_netdev *dp = get_dp_netdev(dpif);
|
||
struct dp_netdev_flow *flow;
|
||
int error;
|
||
|
||
flow = xzalloc(sizeof *flow);
|
||
flow->key = odp_flow->key;
|
||
memset(flow->key.reserved, 0, sizeof flow->key.reserved);
|
||
|
||
error = set_flow_actions(flow, odp_flow);
|
||
if (error) {
|
||
free(flow);
|
||
return error;
|
||
}
|
||
|
||
hmap_insert(&dp->flow_table, &flow->node, flow_hash(&flow->key, 0));
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
clear_stats(struct dp_netdev_flow *flow)
|
||
{
|
||
flow->used.tv_sec = 0;
|
||
flow->used.tv_nsec = 0;
|
||
flow->packet_count = 0;
|
||
flow->byte_count = 0;
|
||
flow->ip_tos = 0;
|
||
flow->tcp_ctl = 0;
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_flow_put(struct dpif *dpif, struct odp_flow_put *put)
|
||
{
|
||
struct dp_netdev *dp = get_dp_netdev(dpif);
|
||
struct dp_netdev_flow *flow;
|
||
|
||
flow = dp_netdev_lookup_flow(dp, &put->flow.key);
|
||
if (!flow) {
|
||
if (put->flags & ODPPF_CREATE) {
|
||
if (hmap_count(&dp->flow_table) < MAX_FLOWS) {
|
||
return add_flow(dpif, &put->flow);
|
||
} else {
|
||
return EFBIG;
|
||
}
|
||
} else {
|
||
return ENOENT;
|
||
}
|
||
} else {
|
||
if (put->flags & ODPPF_MODIFY) {
|
||
int error = set_flow_actions(flow, &put->flow);
|
||
if (!error && put->flags & ODPPF_ZERO_STATS) {
|
||
clear_stats(flow);
|
||
}
|
||
return error;
|
||
} else {
|
||
return EEXIST;
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
static int
|
||
dpif_netdev_flow_del(struct dpif *dpif, struct odp_flow *odp_flow)
|
||
{
|
||
struct dp_netdev *dp = get_dp_netdev(dpif);
|
||
struct dp_netdev_flow *flow;
|
||
|
||
flow = dp_netdev_lookup_flow(dp, &odp_flow->key);
|
||
if (flow) {
|
||
answer_flow_query(flow, 0, odp_flow);
|
||
dp_netdev_free_flow(dp, flow);
|
||
return 0;
|
||
} else {
|
||
return ENOENT;
|
||
}
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_flow_list(const struct dpif *dpif, struct odp_flow flows[], int n)
|
||
{
|
||
struct dp_netdev *dp = get_dp_netdev(dpif);
|
||
struct dp_netdev_flow *flow;
|
||
int i;
|
||
|
||
i = 0;
|
||
HMAP_FOR_EACH (flow, struct dp_netdev_flow, node, &dp->flow_table) {
|
||
if (i >= n) {
|
||
break;
|
||
}
|
||
answer_flow_query(flow, 0, &flows[i++]);
|
||
}
|
||
return hmap_count(&dp->flow_table);
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_execute(struct dpif *dpif, uint16_t in_port,
|
||
const union odp_action actions[], int n_actions,
|
||
const struct ofpbuf *packet)
|
||
{
|
||
struct dp_netdev *dp = get_dp_netdev(dpif);
|
||
struct ofpbuf copy;
|
||
bool mutates;
|
||
flow_t flow;
|
||
int error;
|
||
|
||
if (packet->size < ETH_HEADER_LEN || packet->size > UINT16_MAX) {
|
||
return EINVAL;
|
||
}
|
||
|
||
error = dpif_netdev_validate_actions(actions, n_actions, &mutates);
|
||
if (error) {
|
||
return error;
|
||
}
|
||
|
||
if (mutates) {
|
||
/* We need a deep copy of 'packet' since we're going to modify its
|
||
* data. */
|
||
ofpbuf_init(©, DP_NETDEV_HEADROOM + packet->size);
|
||
copy.data = (char*)copy.base + DP_NETDEV_HEADROOM;
|
||
ofpbuf_put(©, packet->data, packet->size);
|
||
} else {
|
||
/* We still need a shallow copy of 'packet', even though we won't
|
||
* modify its data, because flow_extract() modifies packet->l2, etc.
|
||
* We could probably get away with modifying those but it's more polite
|
||
* if we don't. */
|
||
copy = *packet;
|
||
}
|
||
flow_extract(©, 0, in_port, &flow);
|
||
error = dp_netdev_execute_actions(dp, ©, &flow, actions, n_actions);
|
||
if (mutates) {
|
||
ofpbuf_uninit(©);
|
||
}
|
||
return error;
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_recv_get_mask(const struct dpif *dpif, int *listen_mask)
|
||
{
|
||
struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif);
|
||
*listen_mask = dpif_netdev->listen_mask;
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_recv_set_mask(struct dpif *dpif, int listen_mask)
|
||
{
|
||
struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif);
|
||
if (!(listen_mask & ~ODPL_ALL)) {
|
||
dpif_netdev->listen_mask = listen_mask;
|
||
return 0;
|
||
} else {
|
||
return EINVAL;
|
||
}
|
||
}
|
||
|
||
static struct ovs_queue *
|
||
find_nonempty_queue(struct dpif *dpif)
|
||
{
|
||
struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif);
|
||
struct dp_netdev *dp = get_dp_netdev(dpif);
|
||
int mask = dpif_netdev->listen_mask;
|
||
int i;
|
||
|
||
for (i = 0; i < N_QUEUES; i++) {
|
||
struct ovs_queue *q = &dp->queues[i];
|
||
if (q->n && mask & (1u << i)) {
|
||
return q;
|
||
}
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
static int
|
||
dpif_netdev_recv(struct dpif *dpif, struct ofpbuf **bufp)
|
||
{
|
||
struct ovs_queue *q = find_nonempty_queue(dpif);
|
||
if (q) {
|
||
*bufp = queue_pop_head(q);
|
||
return 0;
|
||
} else {
|
||
return EAGAIN;
|
||
}
|
||
}
|
||
|
||
static void
|
||
dpif_netdev_recv_wait(struct dpif *dpif)
|
||
{
|
||
struct ovs_queue *q = find_nonempty_queue(dpif);
|
||
if (q) {
|
||
poll_immediate_wake();
|
||
} else {
|
||
/* No messages ready to be received, and dp_wait() will ensure that we
|
||
* wake up to queue new messages, so there is nothing to do. */
|
||
}
|
||
}
|
||
|
||
static void
|
||
dp_netdev_flow_used(struct dp_netdev_flow *flow, const flow_t *key,
|
||
const struct ofpbuf *packet)
|
||
{
|
||
time_timespec(&flow->used);
|
||
flow->packet_count++;
|
||
flow->byte_count += packet->size;
|
||
if (key->dl_type == htons(ETH_TYPE_IP)) {
|
||
struct ip_header *nh = packet->l3;
|
||
flow->ip_tos = nh->ip_tos;
|
||
|
||
if (key->nw_proto == IPPROTO_TCP) {
|
||
struct tcp_header *th = packet->l4;
|
||
flow->tcp_ctl |= th->tcp_ctl;
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
dp_netdev_port_input(struct dp_netdev *dp, struct dp_netdev_port *port,
|
||
struct ofpbuf *packet)
|
||
{
|
||
struct dp_netdev_flow *flow;
|
||
flow_t key;
|
||
|
||
if (flow_extract(packet, 0, port->port_no, &key) && dp->drop_frags) {
|
||
dp->n_frags++;
|
||
return;
|
||
}
|
||
|
||
flow = dp_netdev_lookup_flow(dp, &key);
|
||
if (flow) {
|
||
dp_netdev_flow_used(flow, &key, packet);
|
||
dp_netdev_execute_actions(dp, packet, &key,
|
||
flow->actions, flow->n_actions);
|
||
dp->n_hit++;
|
||
} else {
|
||
dp->n_missed++;
|
||
dp_netdev_output_control(dp, packet, _ODPL_MISS_NR, port->port_no, 0);
|
||
}
|
||
}
|
||
|
||
static void
|
||
dp_netdev_run(void)
|
||
{
|
||
struct ofpbuf packet;
|
||
struct dp_netdev *dp;
|
||
|
||
ofpbuf_init(&packet, DP_NETDEV_HEADROOM + max_mtu);
|
||
LIST_FOR_EACH (dp, struct dp_netdev, node, &dp_netdev_list) {
|
||
struct dp_netdev_port *port;
|
||
|
||
LIST_FOR_EACH (port, struct dp_netdev_port, node, &dp->port_list) {
|
||
int error;
|
||
|
||
/* Reset packet contents. */
|
||
packet.data = (char*)packet.base + DP_NETDEV_HEADROOM;
|
||
packet.size = 0;
|
||
|
||
error = netdev_recv(port->netdev, &packet);
|
||
if (!error) {
|
||
dp_netdev_port_input(dp, port, &packet);
|
||
} else if (error != EAGAIN) {
|
||
struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
|
||
VLOG_ERR_RL(&rl, "error receiving data from %s: %s",
|
||
netdev_get_name(port->netdev), strerror(error));
|
||
}
|
||
}
|
||
}
|
||
ofpbuf_uninit(&packet);
|
||
}
|
||
|
||
static void
|
||
dp_netdev_wait(void)
|
||
{
|
||
struct dp_netdev *dp;
|
||
|
||
LIST_FOR_EACH (dp, struct dp_netdev, node, &dp_netdev_list) {
|
||
struct dp_netdev_port *port;
|
||
LIST_FOR_EACH (port, struct dp_netdev_port, node, &dp->port_list) {
|
||
netdev_recv_wait(port->netdev);
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
/* Modify the TCI field of 'packet'. If a VLAN tag is not present, one
|
||
* is added with the TCI field set to 'tci'. If a VLAN tag is present,
|
||
* then 'mask' bits are cleared before 'tci' is logically OR'd into the
|
||
* TCI field.
|
||
*
|
||
* Note that the function does not ensure that 'tci' does not affect
|
||
* bits outside of 'mask'.
|
||
*/
|
||
static void
|
||
dp_netdev_modify_vlan_tci(struct ofpbuf *packet, const flow_t *key,
|
||
uint16_t tci, uint16_t mask)
|
||
{
|
||
struct vlan_eth_header *veh;
|
||
|
||
if (key->dl_vlan != htons(ODP_VLAN_NONE)) {
|
||
/* Clear 'mask' bits, but maintain other TCI bits. */
|
||
veh = packet->l2;
|
||
veh->veth_tci &= ~htons(mask);
|
||
veh->veth_tci |= htons(tci);
|
||
} else {
|
||
/* Insert new 802.1Q header. */
|
||
struct eth_header *eh = packet->l2;
|
||
struct vlan_eth_header tmp;
|
||
memcpy(tmp.veth_dst, eh->eth_dst, ETH_ADDR_LEN);
|
||
memcpy(tmp.veth_src, eh->eth_src, ETH_ADDR_LEN);
|
||
tmp.veth_type = htons(ETH_TYPE_VLAN);
|
||
tmp.veth_tci = htons(tci);
|
||
tmp.veth_next_type = eh->eth_type;
|
||
|
||
veh = ofpbuf_push_uninit(packet, VLAN_HEADER_LEN);
|
||
memcpy(veh, &tmp, sizeof tmp);
|
||
packet->l2 = (char*)packet->l2 - VLAN_HEADER_LEN;
|
||
}
|
||
}
|
||
|
||
static void
|
||
dp_netdev_strip_vlan(struct ofpbuf *packet)
|
||
{
|
||
struct vlan_eth_header *veh = packet->l2;
|
||
if (veh->veth_type == htons(ETH_TYPE_VLAN)) {
|
||
struct eth_header tmp;
|
||
|
||
memcpy(tmp.eth_dst, veh->veth_dst, ETH_ADDR_LEN);
|
||
memcpy(tmp.eth_src, veh->veth_src, ETH_ADDR_LEN);
|
||
tmp.eth_type = veh->veth_next_type;
|
||
|
||
packet->size -= VLAN_HEADER_LEN;
|
||
packet->data = (char*)packet->data + VLAN_HEADER_LEN;
|
||
packet->l2 = (char*)packet->l2 + VLAN_HEADER_LEN;
|
||
memcpy(packet->data, &tmp, sizeof tmp);
|
||
}
|
||
}
|
||
|
||
static void
|
||
dp_netdev_set_dl_src(struct ofpbuf *packet, const uint8_t dl_addr[ETH_ADDR_LEN])
|
||
{
|
||
struct eth_header *eh = packet->l2;
|
||
memcpy(eh->eth_src, dl_addr, sizeof eh->eth_src);
|
||
}
|
||
|
||
static void
|
||
dp_netdev_set_dl_dst(struct ofpbuf *packet, const uint8_t dl_addr[ETH_ADDR_LEN])
|
||
{
|
||
struct eth_header *eh = packet->l2;
|
||
memcpy(eh->eth_dst, dl_addr, sizeof eh->eth_dst);
|
||
}
|
||
|
||
static void
|
||
dp_netdev_set_nw_addr(struct ofpbuf *packet, const flow_t *key,
|
||
const struct odp_action_nw_addr *a)
|
||
{
|
||
if (key->dl_type == htons(ETH_TYPE_IP)) {
|
||
struct ip_header *nh = packet->l3;
|
||
uint32_t *field;
|
||
|
||
field = a->type == ODPAT_SET_NW_SRC ? &nh->ip_src : &nh->ip_dst;
|
||
if (key->nw_proto == IP_TYPE_TCP) {
|
||
struct tcp_header *th = packet->l4;
|
||
th->tcp_csum = recalc_csum32(th->tcp_csum, *field, a->nw_addr);
|
||
} else if (key->nw_proto == IP_TYPE_UDP) {
|
||
struct udp_header *uh = packet->l4;
|
||
if (uh->udp_csum) {
|
||
uh->udp_csum = recalc_csum32(uh->udp_csum, *field, a->nw_addr);
|
||
if (!uh->udp_csum) {
|
||
uh->udp_csum = 0xffff;
|
||
}
|
||
}
|
||
}
|
||
nh->ip_csum = recalc_csum32(nh->ip_csum, *field, a->nw_addr);
|
||
*field = a->nw_addr;
|
||
}
|
||
}
|
||
|
||
static void
|
||
dp_netdev_set_nw_tos(struct ofpbuf *packet, const flow_t *key,
|
||
const struct odp_action_nw_tos *a)
|
||
{
|
||
if (key->dl_type == htons(ETH_TYPE_IP)) {
|
||
struct ip_header *nh = packet->l3;
|
||
uint8_t *field = &nh->ip_tos;
|
||
|
||
/* Set the DSCP bits and preserve the ECN bits. */
|
||
uint8_t new = a->nw_tos | (nh->ip_tos & IP_ECN_MASK);
|
||
|
||
nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t)*field),
|
||
htons((uint16_t)a->nw_tos));
|
||
*field = new;
|
||
}
|
||
}
|
||
|
||
static void
|
||
dp_netdev_set_tp_port(struct ofpbuf *packet, const flow_t *key,
|
||
const struct odp_action_tp_port *a)
|
||
{
|
||
if (key->dl_type == htons(ETH_TYPE_IP)) {
|
||
uint16_t *field;
|
||
if (key->nw_proto == IPPROTO_TCP) {
|
||
struct tcp_header *th = packet->l4;
|
||
field = a->type == ODPAT_SET_TP_SRC ? &th->tcp_src : &th->tcp_dst;
|
||
th->tcp_csum = recalc_csum16(th->tcp_csum, *field, a->tp_port);
|
||
*field = a->tp_port;
|
||
} else if (key->nw_proto == IPPROTO_UDP) {
|
||
struct udp_header *uh = packet->l4;
|
||
field = a->type == ODPAT_SET_TP_SRC ? &uh->udp_src : &uh->udp_dst;
|
||
uh->udp_csum = recalc_csum16(uh->udp_csum, *field, a->tp_port);
|
||
*field = a->tp_port;
|
||
} else {
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
dp_netdev_output_port(struct dp_netdev *dp, struct ofpbuf *packet,
|
||
uint16_t out_port)
|
||
{
|
||
struct dp_netdev_port *p = dp->ports[out_port];
|
||
if (p) {
|
||
netdev_send(p->netdev, packet);
|
||
}
|
||
}
|
||
|
||
static void
|
||
dp_netdev_output_group(struct dp_netdev *dp, uint16_t group, uint16_t in_port,
|
||
struct ofpbuf *packet)
|
||
{
|
||
struct odp_port_group *g = &dp->groups[group];
|
||
int i;
|
||
|
||
for (i = 0; i < g->n_ports; i++) {
|
||
uint16_t out_port = g->ports[i];
|
||
if (out_port != in_port) {
|
||
dp_netdev_output_port(dp, packet, out_port);
|
||
}
|
||
}
|
||
}
|
||
|
||
static int
|
||
dp_netdev_output_control(struct dp_netdev *dp, const struct ofpbuf *packet,
|
||
int queue_no, int port_no, uint32_t arg)
|
||
{
|
||
struct ovs_queue *q = &dp->queues[queue_no];
|
||
struct odp_msg *header;
|
||
struct ofpbuf *msg;
|
||
size_t msg_size;
|
||
|
||
if (q->n >= MAX_QUEUE_LEN) {
|
||
dp->n_lost++;
|
||
return ENOBUFS;
|
||
}
|
||
|
||
msg_size = sizeof *header + packet->size;
|
||
msg = ofpbuf_new(msg_size + DPIF_RECV_MSG_PADDING);
|
||
ofpbuf_reserve(msg, DPIF_RECV_MSG_PADDING);
|
||
header = ofpbuf_put_uninit(msg, sizeof *header);
|
||
header->type = queue_no;
|
||
header->length = msg_size;
|
||
header->port = port_no;
|
||
header->arg = arg;
|
||
ofpbuf_put(msg, packet->data, packet->size);
|
||
queue_push_tail(q, msg);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
dp_netdev_execute_actions(struct dp_netdev *dp,
|
||
struct ofpbuf *packet, const flow_t *key,
|
||
const union odp_action *actions, int n_actions)
|
||
{
|
||
int i;
|
||
for (i = 0; i < n_actions; i++) {
|
||
const union odp_action *a = &actions[i];
|
||
|
||
switch (a->type) {
|
||
case ODPAT_OUTPUT:
|
||
dp_netdev_output_port(dp, packet, a->output.port);
|
||
break;
|
||
|
||
case ODPAT_OUTPUT_GROUP:
|
||
dp_netdev_output_group(dp, a->output_group.group, key->in_port,
|
||
packet);
|
||
break;
|
||
|
||
case ODPAT_CONTROLLER:
|
||
dp_netdev_output_control(dp, packet, _ODPL_ACTION_NR,
|
||
key->in_port, a->controller.arg);
|
||
break;
|
||
|
||
case ODPAT_SET_VLAN_VID:
|
||
dp_netdev_modify_vlan_tci(packet, key, ntohs(a->vlan_vid.vlan_vid),
|
||
VLAN_VID_MASK);
|
||
break;
|
||
|
||
case ODPAT_SET_VLAN_PCP:
|
||
dp_netdev_modify_vlan_tci(
|
||
packet, key, a->vlan_pcp.vlan_pcp << VLAN_PCP_SHIFT,
|
||
VLAN_PCP_MASK);
|
||
break;
|
||
|
||
case ODPAT_STRIP_VLAN:
|
||
dp_netdev_strip_vlan(packet);
|
||
break;
|
||
|
||
case ODPAT_SET_DL_SRC:
|
||
dp_netdev_set_dl_src(packet, a->dl_addr.dl_addr);
|
||
break;
|
||
|
||
case ODPAT_SET_DL_DST:
|
||
dp_netdev_set_dl_dst(packet, a->dl_addr.dl_addr);
|
||
break;
|
||
|
||
case ODPAT_SET_NW_SRC:
|
||
case ODPAT_SET_NW_DST:
|
||
dp_netdev_set_nw_addr(packet, key, &a->nw_addr);
|
||
break;
|
||
|
||
case ODPAT_SET_NW_TOS:
|
||
dp_netdev_set_nw_tos(packet, key, &a->nw_tos);
|
||
break;
|
||
|
||
case ODPAT_SET_TP_SRC:
|
||
case ODPAT_SET_TP_DST:
|
||
dp_netdev_set_tp_port(packet, key, &a->tp_port);
|
||
break;
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
const struct dpif_class dpif_netdev_class = {
|
||
"netdev",
|
||
dp_netdev_run,
|
||
dp_netdev_wait,
|
||
NULL, /* enumerate */
|
||
dpif_netdev_open,
|
||
dpif_netdev_close,
|
||
NULL, /* get_all_names */
|
||
dpif_netdev_destroy,
|
||
dpif_netdev_get_stats,
|
||
dpif_netdev_get_drop_frags,
|
||
dpif_netdev_set_drop_frags,
|
||
dpif_netdev_port_add,
|
||
dpif_netdev_port_del,
|
||
dpif_netdev_port_query_by_number,
|
||
dpif_netdev_port_query_by_name,
|
||
dpif_netdev_port_list,
|
||
dpif_netdev_port_poll,
|
||
dpif_netdev_port_poll_wait,
|
||
dpif_netdev_port_group_get,
|
||
dpif_netdev_port_group_set,
|
||
dpif_netdev_flow_get,
|
||
dpif_netdev_flow_put,
|
||
dpif_netdev_flow_del,
|
||
dpif_netdev_flow_flush,
|
||
dpif_netdev_flow_list,
|
||
dpif_netdev_execute,
|
||
dpif_netdev_recv_get_mask,
|
||
dpif_netdev_recv_set_mask,
|
||
NULL, /* get_sflow_probability */
|
||
NULL, /* set_sflow_probability */
|
||
dpif_netdev_recv,
|
||
dpif_netdev_recv_wait,
|
||
};
|