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https://github.com/openvswitch/ovs
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b063d9f06e
Currently we publish several multicast groups for upcalls and let userspace sockets subscribe to them. The benefit of this is mostly that userspace is the one doing the subscription - the actual multicast capability is not currently used and probably wouldn't be even if we moved to a multiprocess model. Despite the convenience, multicast sockets have a number of disadvantages, primarily that we only have a limited number of them so there could be collisions. In addition, unicast sockets give additional flexibility to userspace by allowing every object to potentially have a different socket chosen by userspace for upcalls. Finally, any future optimizations for upcalls to reduce copying will likely not be compatible with multicast anyways so disallowing it potentially simplifies things. We also never unregistered the multicast groups registered for upcalls and leaked them on module unload. As a side effect, this solves that problem. Signed-off-by: Jesse Gross <jesse@nicira.com> Acked-by: Ben Pfaff <blp@nicira.com>
59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
/*
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* Copyright (c) 2010, 2011 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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#ifndef DPIF_LINUX_H
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#define DPIF_LINUX_H 1
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#include <stdbool.h>
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#include <stdint.h>
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#include "openvswitch/datapath-protocol.h"
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struct ofpbuf;
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struct dpif_linux_vport {
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/* Generic Netlink header. */
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uint8_t cmd;
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/* ovs_vport header. */
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int dp_ifindex;
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uint32_t port_no; /* UINT32_MAX if unknown. */
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enum ovs_vport_type type;
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/* Attributes. */
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const char *name; /* OVS_VPORT_ATTR_NAME. */
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uint32_t upcall_pid; /* OVS_VPORT_ATTR_UPCALL_PID. */
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const struct ovs_vport_stats *stats; /* OVS_VPORT_ATTR_STATS. */
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const uint8_t *address; /* OVS_VPORT_ATTR_ADDRESS. */
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const struct nlattr *options; /* OVS_VPORT_ATTR_OPTIONS. */
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size_t options_len;
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int ifindex; /* OVS_VPORT_ATTR_IFINDEX. */
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};
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void dpif_linux_vport_init(struct dpif_linux_vport *);
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int dpif_linux_vport_transact(const struct dpif_linux_vport *request,
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struct dpif_linux_vport *reply,
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struct ofpbuf **bufp);
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int dpif_linux_vport_get(const char *name, struct dpif_linux_vport *reply,
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struct ofpbuf **bufp);
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bool dpif_linux_is_internal_device(const char *name);
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int dpif_linux_vport_send(int dp_ifindex, uint32_t port_no,
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const void *data, size_t size);
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#endif /* dpif-linux.h */
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