From fb971e19aba6f350a574da00d7830dda315b1e87 Mon Sep 17 00:00:00 2001
From: David Gwynne <dlg@cvs.openbsd.org>
Date: Sat, 21 Apr 2007 12:32:33 +0000
Subject: create struct tht_pkt to keep track of mbufs that are on the hardware
 and their dmamaps. so far it looks like the same thing can be used to look
 after both the transmitted and recved packets.

this also adds code to allocate a list of them and set up their dmamaps,
some free list handling, and code to free them when you dont want them
anymore.
---
 sys/dev/pci/if_tht.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 83 insertions(+), 1 deletion(-)

diff --git a/sys/dev/pci/if_tht.c b/sys/dev/pci/if_tht.c
index 65f24c46a60..6bf392a397e 100644
--- a/sys/dev/pci/if_tht.c
+++ b/sys/dev/pci/if_tht.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_tht.c,v 1.37 2007/04/21 12:25:42 dlg Exp $ */
+/*	$OpenBSD: if_tht.c,v 1.38 2007/04/21 12:32:32 dlg Exp $ */
 
 /*
  * Copyright (c) 2007 David Gwynne <dlg@openbsd.org>
@@ -318,6 +318,20 @@ struct tht_fifo {
 	int			tf_wptr;
 };
 
+struct tht_pkt {
+	u_int64_t		tp_id;
+
+	bus_dmamap_t		tp_dmap;
+	struct mbuf		*tp_m;
+
+	TAILQ_ENTRY(tht_pkt)	tp_link;
+};
+
+struct tht_pkt_list {
+	struct tht_pkt		*tpl_pkts;
+	TAILQ_HEAD(, tht_pkt)	tpl_list;
+};
+
 struct tht_softc {
 	struct device		sc_dev;
 	struct thtc_softc	*sc_thtc;
@@ -352,6 +366,14 @@ struct cfdriver tht_cd = {
 	NULL, "tht", DV_IFNET
 };
 
+/* pkts */
+int			tht_pkt_alloc(struct tht_softc *,
+			    struct tht_pkt_list *, int, int);
+void			tht_pkt_free(struct tht_softc *,
+			    struct tht_pkt_list *);
+void			tht_pkt_put(struct tht_pkt_list *, struct tht_pkt *);
+struct tht_pkt 		*tht_pkt_get(struct tht_pkt_list *);
+
 /* fifos */
 
 struct tht_fifo_desc tht_txt_desc = {
@@ -1137,3 +1159,63 @@ tht_dmamem_free(struct tht_softc *sc, struct tht_dmamem *tdm)
 	bus_dmamap_destroy(dmat, tdm->tdm_map);
 	free(tdm, M_DEVBUF);
 }
+
+int
+tht_pkt_alloc(struct tht_softc *sc, struct tht_pkt_list *tpl, int npkts,
+    int nsegs)
+{
+	bus_dma_tag_t			dmat = sc->sc_thtc->sc_dmat;
+	struct tht_pkt			*pkt;
+	int				i;
+
+	tpl->tpl_pkts = malloc(sizeof(struct tht_pkt) * npkts, M_DEVBUF,
+	    M_WAITOK);
+	bzero(tpl->tpl_pkts, sizeof(struct tht_pkt) * npkts);
+
+	TAILQ_INIT(&tpl->tpl_list);
+	for (i = 0; i < npkts; i++) {
+		pkt = &tpl->tpl_pkts[i];
+
+		pkt->tp_id = i;
+		if (bus_dmamap_create(dmat, THT_PBD_PKTLEN, nsegs,
+		    THT_PBD_PKTLEN, 0, BUS_DMA_WAITOK | BUS_DMA_ALLOCNOW,
+		    &pkt->tp_dmap) != 0) {
+			tht_pkt_free(sc, tpl);
+			return (1);
+		}
+
+		tht_pkt_put(tpl, pkt);
+	}
+
+	return (0);
+}
+
+void
+tht_pkt_free(struct tht_softc *sc, struct tht_pkt_list *tpl)
+{
+	bus_dma_tag_t			dmat = sc->sc_thtc->sc_dmat;
+	struct tht_pkt			*pkt;
+
+	while ((pkt = tht_pkt_get(tpl)) != NULL)
+		bus_dmamap_destroy(dmat, pkt->tp_dmap);
+	free(tpl->tpl_pkts, M_DEVBUF);
+	tpl->tpl_pkts = NULL;
+}
+
+void
+tht_pkt_put(struct tht_pkt_list *tpl, struct tht_pkt *pkt)
+{
+	TAILQ_INSERT_TAIL(&tpl->tpl_list, pkt, tp_link);
+}
+
+struct tht_pkt *
+tht_pkt_get(struct tht_pkt_list *tpl)
+{
+	struct tht_pkt			*pkt;
+
+	pkt = TAILQ_FIRST(&tpl->tpl_list);
+	if (pkt != NULL)
+		TAILQ_REMOVE(&tpl->tpl_list, pkt, tp_link);
+
+	return (pkt);
+}
-- 
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