svn commit: r307988 - head/sys/dev/hyperv/netvsc

[Sepherosa Ziehau]

Author: sephe
Date: Thu Oct 27 05:04:54 2016
New Revision: 307988
URL: https://svnweb.freebsd.org/changeset/base/307988

Log:
  hyperv/hn: Shuffle chimney sending buffer alloc/free around.
  
  This paves way for more chimney sending buffer reorganization.
  
  MFC after:	1 week
  Sponsored by:	Microsoft
  Differential Revision:	https://reviews.freebsd.org/D8343

Modified:
  head/sys/dev/hyperv/netvsc/hv_net_vsc.c
  head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
  head/sys/dev/hyperv/netvsc/if_hnvar.h

Modified: head/sys/dev/hyperv/netvsc/hv_net_vsc.c
==============================================================================
--- head/sys/dev/hyperv/netvsc/hv_net_vsc.c	Thu Oct 27 04:55:19 2016	(r307987)
+++ head/sys/dev/hyperv/netvsc/hv_net_vsc.c	Thu Oct 27 05:04:54 2016	(r307988)
@@ -73,33 +73,6 @@ static const uint32_t		hn_nvs_version[] 
 	HN_NVS_VERSION_1
 };
 
-uint32_t
-hn_chim_alloc(struct hn_softc *sc)
-{
-	int i, bmap_cnt = sc->hn_chim_bmap_cnt;
-	u_long *bmap = sc->hn_chim_bmap;
-	uint32_t ret = HN_NVS_CHIM_IDX_INVALID;
-
-	for (i = 0; i < bmap_cnt; ++i) {
-		int idx;
-
-		idx = ffsl(~bmap[i]);
-		if (idx == 0)
-			continue;
-
-		--idx; /* ffsl is 1-based */
-		KASSERT(i * LONG_BIT + idx < sc->hn_chim_cnt,
-		    ("invalid i %d and idx %d", i, idx));
-
-		if (atomic_testandset_long(&bmap[i], idx))
-			continue;
-
-		ret = i * LONG_BIT + idx;
-		break;
-	}
-	return (ret);
-}
-
 static const void *
 hn_nvs_xact_execute(struct hn_softc *sc, struct vmbus_xact *xact,
     void *req, int reqlen, size_t *resplen0, uint32_t type)
@@ -648,25 +621,6 @@ hn_nvs_sent_none(struct hn_send_ctx *snd
 	/* EMPTY */
 }
 
-void
-hn_chim_free(struct hn_softc *sc, uint32_t chim_idx)
-{
-	u_long mask;
-	uint32_t idx;
-
-	idx = chim_idx / LONG_BIT;
-	KASSERT(idx < sc->hn_chim_bmap_cnt,
-	    ("invalid chimney index 0x%x", chim_idx));
-
-	mask = 1UL << (chim_idx % LONG_BIT);
-	KASSERT(sc->hn_chim_bmap[idx] & mask,
-	    ("index bitmap 0x%lx, chimney index %u, "
-	     "bitmap idx %d, bitmask 0x%lx",
-	     sc->hn_chim_bmap[idx], chim_idx, idx, mask));
-
-	atomic_clear_long(&sc->hn_chim_bmap[idx], mask);
-}
-
 int
 hn_nvs_alloc_subchans(struct hn_softc *sc, int *nsubch0)
 {

Modified: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
==============================================================================
--- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c	Thu Oct 27 04:55:19 2016	(r307987)
+++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c	Thu Oct 27 05:04:54 2016	(r307988)
@@ -61,6 +61,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/sockio.h>
+#include <sys/limits.h>
 #include <sys/mbuf.h>
 #include <sys/malloc.h>
 #include <sys/module.h>
@@ -457,6 +458,52 @@ hn_sendpkt_rndis_chim(struct hn_tx_ring 
 	    &rndis, sizeof(rndis), &txd->send_ctx));
 }
 
+static __inline uint32_t
+hn_chim_alloc(struct hn_softc *sc)
+{
+	int i, bmap_cnt = sc->hn_chim_bmap_cnt;
+	u_long *bmap = sc->hn_chim_bmap;
+	uint32_t ret = HN_NVS_CHIM_IDX_INVALID;
+
+	for (i = 0; i < bmap_cnt; ++i) {
+		int idx;
+
+		idx = ffsl(~bmap[i]);
+		if (idx == 0)
+			continue;
+
+		--idx; /* ffsl is 1-based */
+		KASSERT(i * LONG_BIT + idx < sc->hn_chim_cnt,
+		    ("invalid i %d and idx %d", i, idx));
+
+		if (atomic_testandset_long(&bmap[i], idx))
+			continue;
+
+		ret = i * LONG_BIT + idx;
+		break;
+	}
+	return (ret);
+}
+
+static __inline void
+hn_chim_free(struct hn_softc *sc, uint32_t chim_idx)
+{
+	u_long mask;
+	uint32_t idx;
+
+	idx = chim_idx / LONG_BIT;
+	KASSERT(idx < sc->hn_chim_bmap_cnt,
+	    ("invalid chimney index 0x%x", chim_idx));
+
+	mask = 1UL << (chim_idx % LONG_BIT);
+	KASSERT(sc->hn_chim_bmap[idx] & mask,
+	    ("index bitmap 0x%lx, chimney index %u, "
+	     "bitmap idx %d, bitmask 0x%lx",
+	     sc->hn_chim_bmap[idx], chim_idx, idx, mask));
+
+	atomic_clear_long(&sc->hn_chim_bmap[idx], mask);
+}
+
 static int
 hn_set_rxfilter(struct hn_softc *sc)
 {

Modified: head/sys/dev/hyperv/netvsc/if_hnvar.h
==============================================================================
--- head/sys/dev/hyperv/netvsc/if_hnvar.h	Thu Oct 27 04:55:19 2016	(r307987)
+++ head/sys/dev/hyperv/netvsc/if_hnvar.h	Thu Oct 27 05:04:54 2016	(r307988)
@@ -94,9 +94,6 @@ hn_nvs_send_sglist(struct vmbus_channel 
 struct vmbus_xact;
 struct rndis_packet_msg;
 
-uint32_t	hn_chim_alloc(struct hn_softc *sc);
-void		hn_chim_free(struct hn_softc *sc, uint32_t chim_idx);
-
 int		hn_rndis_attach(struct hn_softc *sc, int mtu);
 void		hn_rndis_detach(struct hn_softc *sc);
 int		hn_rndis_conf_rss(struct hn_softc *sc, uint16_t flags);