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      1 /*	$NetBSD: ieee8023ad_lacp_sm_tx.c,v 1.5 2021/11/30 01:17:02 yamaguchi Exp $	*/
      2 
      3 /*-
      4  * Copyright (c)2005 YAMAMOTO Takashi,
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: ieee8023ad_lacp_sm_tx.c,v 1.5 2021/11/30 01:17:02 yamaguchi Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/callout.h>
     34 #include <sys/mbuf.h>
     35 #include <sys/systm.h>
     36 #include <sys/kernel.h>	/* getticks() */
     37 
     38 #include <net/if.h>
     39 #include <net/if_ether.h>
     40 #include <net/ether_slowprotocols.h>
     41 
     42 #include <net/agr/ieee8023_tlv.h>
     43 #include <net/agr/ieee8023ad_lacp.h>
     44 #include <net/agr/ieee8023ad_lacp_impl.h>
     45 #include <net/agr/ieee8023ad_lacp_sm.h>
     46 #include <net/agr/ieee8023ad_lacp_debug.h>
     47 
     48 /* transmit machine */
     49 
     50 void
     51 lacp_sm_tx(struct lacp_port *lp)
     52 {
     53 	int error;
     54 	int now;
     55 
     56 	if (!(lp->lp_state & LACP_STATE_AGGREGATION)
     57 #if 1
     58 	    || (!(lp->lp_state & LACP_STATE_ACTIVITY)
     59 	    && !(lp->lp_partner.lip_state & LACP_STATE_ACTIVITY))
     60 #endif
     61 	    ) {
     62 		lp->lp_flags &= ~LACPPORT_NTT;
     63 	}
     64 
     65 	if (!(lp->lp_flags & LACPPORT_NTT)) {
     66 		return;
     67 	}
     68 
     69 	/* rate limit */
     70 	now = getticks();
     71 	if ((unsigned int)(now - lp->lp_last_lacpdu_sent) <=
     72 	    LACP_FAST_PERIODIC_TIME * hz / 3) {
     73 		return;
     74 	}
     75 	lp->lp_last_lacpdu_sent = now;
     76 
     77 	error = lacp_xmit_lacpdu(lp);
     78 
     79 	if (error == 0) {
     80 		lp->lp_flags &= ~LACPPORT_NTT;
     81 	} else {
     82 		LACP_DPRINTF((lp, "lacpdu transmit failure, error %d\n",
     83 		    error));
     84 	}
     85 }
     86 
     87 void
     88 lacp_sm_assert_ntt(struct lacp_port *lp)
     89 {
     90 
     91 	lp->lp_flags |= LACPPORT_NTT;
     92 }
     93