mirror of
https://github.com/openvswitch/ovs
synced 2025-10-19 14:37:21 +00:00
3b6a2571f0
The newly created autopath action will be the way OpenFlow interacts with the existing bonding infrastructure.
111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/*
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* Copyright (c) 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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#include <config.h>
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#include "autopath.h"
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#include <inttypes.h>
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#include <stdlib.h>
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#include "flow.h"
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#include "nx-match.h"
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#include "ofp-util.h"
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#include "openflow/nicira-ext.h"
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#include "vlog.h"
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VLOG_DEFINE_THIS_MODULE(autopath);
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static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
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/* Loads 'ofp_port' into the appropriate register in accordance with the
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* autopath action. */
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void
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autopath_execute(const struct nx_action_autopath *ap, struct flow *flow,
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uint16_t ofp_port)
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{
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uint32_t *reg = &flow->regs[NXM_NX_REG_IDX(ntohl(ap->dst))];
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int ofs = nxm_decode_ofs(ap->ofs_nbits);
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int n_bits = nxm_decode_n_bits(ap->ofs_nbits);
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uint32_t mask = n_bits == 32 ? UINT32_MAX : (UINT32_C(1) << n_bits) - 1;
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*reg = (*reg & ~(mask << ofs)) | ((ofp_port & mask) << ofs);
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}
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void
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autopath_parse(struct nx_action_autopath *ap, const char *s_)
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{
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char *s;
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uint32_t reg;
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int id_int, ofs, n_bits;
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char *id_str, *dst, *save_ptr;
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s = xstrdup(s_);
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save_ptr = NULL;
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id_str = strtok_r(s, ", ", &save_ptr);
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dst = strtok_r(NULL, ", ", &save_ptr);
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if (!dst) {
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ovs_fatal(0, "%s: not enough arguments to autopath action", s_);
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}
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id_int = atoi(id_str);
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if (id_int < 1 || id_int > UINT32_MAX) {
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ovs_fatal(0, "%s: autopath id %d is not in valid range "
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"1 to %"PRIu32, s_, id_int, UINT32_MAX);
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}
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nxm_parse_field_bits(dst, ®, &ofs, &n_bits);
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if (!NXM_IS_NX_REG(reg) || NXM_NX_REG_IDX(reg) >= FLOW_N_REGS) {
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ovs_fatal(0, "%s: destination field must be a register", s_);
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}
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if (n_bits < 16) {
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ovs_fatal(0, "%s: %d-bit destination field has %u possible values, "
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"less than required 65536", s_, n_bits, 1u << n_bits);
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}
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memset(ap, 0, sizeof *ap);
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ap->type = htons(OFPAT_VENDOR);
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ap->len = htons(sizeof *ap);
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ap->vendor = htonl(NX_VENDOR_ID);
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ap->subtype = htons(NXAST_AUTOPATH);
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ap->id = htonl(id_int);
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ap->ofs_nbits = nxm_encode_ofs_nbits(ofs, n_bits);
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ap->dst = htonl(reg);
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free(s);
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}
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int
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autopath_check(const struct nx_action_autopath *ap)
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{
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uint32_t dst = ntohl(ap->dst);
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int ofs = nxm_decode_ofs(ap->ofs_nbits);
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int n_bits = nxm_decode_n_bits(ap->ofs_nbits);
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if (!NXM_IS_NX_REG(dst) || NXM_NX_REG_IDX(dst) >= FLOW_N_REGS) {
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VLOG_WARN_RL(&rl, "unsupported destination field %#"PRIx32, dst);
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} else if (ofs + n_bits > nxm_field_bits(dst)) {
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VLOG_WARN_RL(&rl, "destination overflows output field");
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} else if (n_bits < 16) {
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VLOG_WARN_RL(&rl, "minimum of 16 bits required in output field");
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} else {
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return 0;
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}
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return ofp_mkerr(OFPET_BAD_ACTION, OFPBAC_BAD_ARGUMENT);
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}
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