Module Name: src
Committed By: sborrill
Date: Fri Nov 18 23:25:40 UTC 2011
Modified Files:
src/sys/dev/pci [netbsd-5]: if_age.c
Log Message:
Pull up the following revisions(s) (requested by bouyer in ticket #1694):
sys/dev/pci/if_age.c: revision 1.40 via patch
- age_init() is called from age_watchdog() which is in interrupt context; we
can't sleep here or we get a DIAGNOSTIC panic when age_watchdog() fires.
- More correct bus_dma(9) usage in age_encap()
- Introduce a age_shutdown() to be called by pmf(9) at shutdown time,
to stop the DMA engine.
- Be consistent in WAIT/NOWAIT use in init routines
- Use BUS_DMA_COHERENT where appropriate
- Rework the interrupt routine a bit, and ACK but do not disable interrupts
here. There seems to be a race where interrupts would not be properly
reenabled after this, leading do watchdog timeouts.
To generate a diff of this commit:
cvs rdiff -u -r1.28.2.5 -r1.28.2.6 src/sys/dev/pci/if_age.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/dev/pci/if_age.c
diff -u src/sys/dev/pci/if_age.c:1.28.2.5 src/sys/dev/pci/if_age.c:1.28.2.6
--- src/sys/dev/pci/if_age.c:1.28.2.5 Sun Nov 8 22:03:32 2009
+++ src/sys/dev/pci/if_age.c Fri Nov 18 23:25:40 2011
@@ -1,4 +1,4 @@
-/* $NetBSD: if_age.c,v 1.28.2.5 2009/11/08 22:03:32 snj Exp $ */
+/* $NetBSD: if_age.c,v 1.28.2.6 2011/11/18 23:25:40 sborrill Exp $ */
/* $OpenBSD: if_age.c,v 1.1 2009/01/16 05:00:34 kevlo Exp $ */
/*-
@@ -31,7 +31,7 @@
/* Driver for Attansic Technology Corp. L1 Gigabit Ethernet. */
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_age.c,v 1.28.2.5 2009/11/08 22:03:32 snj Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_age.c,v 1.28.2.6 2011/11/18 23:25:40 sborrill Exp $");
#include "bpfilter.h"
#include "vlan.h"
@@ -93,6 +93,7 @@ static int age_init(struct ifnet *);
static int age_ioctl(struct ifnet *, u_long, void *);
static void age_start(struct ifnet *);
static void age_watchdog(struct ifnet *);
+static bool age_shutdown(device_t, int);
static void age_mediastatus(struct ifnet *, struct ifmediareq *);
static int age_mediachange(struct ifnet *);
@@ -287,7 +288,7 @@ age_attach(device_t parent, device_t sel
if_attach(ifp);
ether_ifattach(ifp, sc->sc_enaddr);
- if (!pmf_device_register(self, NULL, age_resume))
+ if (!pmf_device_register1(self, NULL, age_resume, age_shutdown))
aprint_error_dev(self, "couldn't establish power handler\n");
else
pmf_class_network_register(self, ifp);
@@ -495,65 +496,61 @@ age_intr(void *arg)
cmb = sc->age_rdata.age_cmb_block;
if (cmb == NULL) {
/* Happens when bringing up the interface
- * w/o having a carrier. Ack. the interrupt.
+ * w/o having a carrier. Ack the interrupt.
*/
CSR_WRITE_4(sc, AGE_INTR_STATUS, status);
return 0;
}
- /* Disable interrupts. */
- CSR_WRITE_4(sc, AGE_INTR_STATUS, status | INTR_DIS_INT);
-
- bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_cmb_block_map, 0,
- sc->age_cdata.age_cmb_block_map->dm_mapsize, BUS_DMASYNC_POSTREAD);
- status = le32toh(cmb->intr_status);
- if ((status & AGE_INTRS) == 0)
- goto back;
-
- sc->age_tpd_cons = (le32toh(cmb->tpd_cons) & TPD_CONS_MASK) >>
- TPD_CONS_SHIFT;
- sc->age_rr_prod = (le32toh(cmb->rprod_cons) & RRD_PROD_MASK) >>
- RRD_PROD_SHIFT;
-
- /* Let hardware know CMB was served. */
- cmb->intr_status = 0;
bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_cmb_block_map, 0,
sc->age_cdata.age_cmb_block_map->dm_mapsize,
- BUS_DMASYNC_PREWRITE);
-
- if (ifp->if_flags & IFF_RUNNING) {
- if (status & INTR_CMB_RX)
- age_rxintr(sc, sc->age_rr_prod);
-
- if (status & INTR_CMB_TX)
- age_txintr(sc, sc->age_tpd_cons);
-
- if (status & (INTR_DMA_RD_TO_RST | INTR_DMA_WR_TO_RST)) {
- if (status & INTR_DMA_RD_TO_RST)
- printf("%s: DMA read error! -- resetting\n",
- device_xname(sc->sc_dev));
- if (status & INTR_DMA_WR_TO_RST)
- printf("%s: DMA write error! -- resetting\n",
- device_xname(sc->sc_dev));
- age_init(ifp);
- }
+ BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
+ status = le32toh(cmb->intr_status);
+ /* ACK/reenable interrupts */
+ CSR_WRITE_4(sc, AGE_INTR_STATUS, status);
+ while ((status & AGE_INTRS) != 0) {
+ sc->age_tpd_cons = (le32toh(cmb->tpd_cons) & TPD_CONS_MASK) >>
+ TPD_CONS_SHIFT;
+ sc->age_rr_prod = (le32toh(cmb->rprod_cons) & RRD_PROD_MASK) >>
+ RRD_PROD_SHIFT;
+
+ /* Let hardware know CMB was served. */
+ cmb->intr_status = 0;
+ bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_cmb_block_map, 0,
+ sc->age_cdata.age_cmb_block_map->dm_mapsize,
+ BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
+
+ if (ifp->if_flags & IFF_RUNNING) {
+ if (status & INTR_CMB_RX)
+ age_rxintr(sc, sc->age_rr_prod);
+
+ if (status & INTR_CMB_TX)
+ age_txintr(sc, sc->age_tpd_cons);
+
+ if (status & (INTR_DMA_RD_TO_RST | INTR_DMA_WR_TO_RST)) {
+ if (status & INTR_DMA_RD_TO_RST)
+ printf("%s: DMA read error! -- "
+ "resetting\n",
+ device_xname(sc->sc_dev));
+ if (status & INTR_DMA_WR_TO_RST)
+ printf("%s: DMA write error! -- "
+ "resetting\n",
+ device_xname(sc->sc_dev));
+ age_init(ifp);
+ }
- if (!IFQ_IS_EMPTY(&ifp->if_snd))
age_start(ifp);
- if (status & INTR_SMB)
- age_stats_update(sc);
+ if (status & INTR_SMB)
+ age_stats_update(sc);
+ }
+ /* check if more interrupts did came in */
+ bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_cmb_block_map, 0,
+ sc->age_cdata.age_cmb_block_map->dm_mapsize,
+ BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
+ status = le32toh(cmb->intr_status);
}
- /* Check whether CMB was updated while serving Tx/Rx/SMB handler. */
- bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_cmb_block_map, 0,
- sc->age_cdata.age_cmb_block_map->dm_mapsize,
- BUS_DMASYNC_POSTREAD);
-
-back:
- /* Re-enable interrupts. */
- CSR_WRITE_4(sc, AGE_INTR_STATUS, 0);
-
return 1;
}
@@ -702,7 +699,7 @@ age_dma_alloc(struct age_softc *sc)
/* Allocate DMA'able memory for TX ring */
error = bus_dmamem_alloc(sc->sc_dmat, AGE_TX_RING_SZ,
ETHER_ALIGN, 0, &sc->age_rdata.age_tx_ring_seg, 1,
- &nsegs, BUS_DMA_WAITOK);
+ &nsegs, BUS_DMA_NOWAIT);
if (error) {
printf("%s: could not allocate DMA'able memory for Tx ring, "
"error = %i\n", device_xname(sc->sc_dev), error);
@@ -711,7 +708,7 @@ age_dma_alloc(struct age_softc *sc)
error = bus_dmamem_map(sc->sc_dmat, &sc->age_rdata.age_tx_ring_seg,
nsegs, AGE_TX_RING_SZ, (void **)&sc->age_rdata.age_tx_ring,
- BUS_DMA_NOWAIT);
+ BUS_DMA_NOWAIT | BUS_DMA_COHERENT);
if (error)
return ENOBUFS;
@@ -719,7 +716,7 @@ age_dma_alloc(struct age_softc *sc)
/* Load the DMA map for Tx ring. */
error = bus_dmamap_load(sc->sc_dmat, sc->age_cdata.age_tx_ring_map,
- sc->age_rdata.age_tx_ring, AGE_TX_RING_SZ, NULL, BUS_DMA_WAITOK);
+ sc->age_rdata.age_tx_ring, AGE_TX_RING_SZ, NULL, BUS_DMA_NOWAIT);
if (error) {
printf("%s: could not load DMA'able memory for Tx ring, "
"error = %i\n", device_xname(sc->sc_dev), error);
@@ -744,7 +741,7 @@ age_dma_alloc(struct age_softc *sc)
/* Allocate DMA'able memory for RX ring */
error = bus_dmamem_alloc(sc->sc_dmat, AGE_RX_RING_SZ,
ETHER_ALIGN, 0, &sc->age_rdata.age_rx_ring_seg, 1,
- &nsegs, BUS_DMA_WAITOK);
+ &nsegs, BUS_DMA_NOWAIT);
if (error) {
printf("%s: could not allocate DMA'able memory for Rx ring, "
"error = %i.\n", device_xname(sc->sc_dev), error);
@@ -753,7 +750,7 @@ age_dma_alloc(struct age_softc *sc)
error = bus_dmamem_map(sc->sc_dmat, &sc->age_rdata.age_rx_ring_seg,
nsegs, AGE_RX_RING_SZ, (void **)&sc->age_rdata.age_rx_ring,
- BUS_DMA_NOWAIT);
+ BUS_DMA_NOWAIT | BUS_DMA_COHERENT);
if (error)
return ENOBUFS;
@@ -761,7 +758,7 @@ age_dma_alloc(struct age_softc *sc)
/* Load the DMA map for Rx ring. */
error = bus_dmamap_load(sc->sc_dmat, sc->age_cdata.age_rx_ring_map,
- sc->age_rdata.age_rx_ring, AGE_RX_RING_SZ, NULL, BUS_DMA_WAITOK);
+ sc->age_rdata.age_rx_ring, AGE_RX_RING_SZ, NULL, BUS_DMA_NOWAIT);
if (error) {
printf("%s: could not load DMA'able memory for Rx ring, "
"error = %i.\n", device_xname(sc->sc_dev), error);
@@ -786,7 +783,7 @@ age_dma_alloc(struct age_softc *sc)
/* Allocate DMA'able memory for RX return ring */
error = bus_dmamem_alloc(sc->sc_dmat, AGE_RR_RING_SZ,
ETHER_ALIGN, 0, &sc->age_rdata.age_rr_ring_seg, 1,
- &nsegs, BUS_DMA_WAITOK);
+ &nsegs, BUS_DMA_NOWAIT);
if (error) {
printf("%s: could not allocate DMA'able memory for Rx "
"return ring, error = %i.\n",
@@ -796,7 +793,7 @@ age_dma_alloc(struct age_softc *sc)
error = bus_dmamem_map(sc->sc_dmat, &sc->age_rdata.age_rr_ring_seg,
nsegs, AGE_RR_RING_SZ, (void **)&sc->age_rdata.age_rr_ring,
- BUS_DMA_NOWAIT);
+ BUS_DMA_NOWAIT | BUS_DMA_COHERENT);
if (error)
return ENOBUFS;
@@ -804,7 +801,7 @@ age_dma_alloc(struct age_softc *sc)
/* Load the DMA map for Rx return ring. */
error = bus_dmamap_load(sc->sc_dmat, sc->age_cdata.age_rr_ring_map,
- sc->age_rdata.age_rr_ring, AGE_RR_RING_SZ, NULL, BUS_DMA_WAITOK);
+ sc->age_rdata.age_rr_ring, AGE_RR_RING_SZ, NULL, BUS_DMA_NOWAIT);
if (error) {
printf("%s: could not load DMA'able memory for Rx return ring, "
"error = %i\n", device_xname(sc->sc_dev), error);
@@ -830,7 +827,7 @@ age_dma_alloc(struct age_softc *sc)
/* Allocate DMA'able memory for CMB block */
error = bus_dmamem_alloc(sc->sc_dmat, AGE_CMB_BLOCK_SZ,
ETHER_ALIGN, 0, &sc->age_rdata.age_cmb_block_seg, 1,
- &nsegs, BUS_DMA_WAITOK);
+ &nsegs, BUS_DMA_NOWAIT);
if (error) {
printf("%s: could not allocate DMA'able memory for "
"CMB block, error = %i\n", device_xname(sc->sc_dev), error);
@@ -839,7 +836,7 @@ age_dma_alloc(struct age_softc *sc)
error = bus_dmamem_map(sc->sc_dmat, &sc->age_rdata.age_cmb_block_seg,
nsegs, AGE_CMB_BLOCK_SZ, (void **)&sc->age_rdata.age_cmb_block,
- BUS_DMA_NOWAIT);
+ BUS_DMA_NOWAIT | BUS_DMA_COHERENT);
if (error)
return ENOBUFS;
@@ -848,7 +845,7 @@ age_dma_alloc(struct age_softc *sc)
/* Load the DMA map for CMB block. */
error = bus_dmamap_load(sc->sc_dmat, sc->age_cdata.age_cmb_block_map,
sc->age_rdata.age_cmb_block, AGE_CMB_BLOCK_SZ, NULL,
- BUS_DMA_WAITOK);
+ BUS_DMA_NOWAIT);
if (error) {
printf("%s: could not load DMA'able memory for CMB block, "
"error = %i\n", device_xname(sc->sc_dev), error);
@@ -874,7 +871,7 @@ age_dma_alloc(struct age_softc *sc)
/* Allocate DMA'able memory for SMB block */
error = bus_dmamem_alloc(sc->sc_dmat, AGE_SMB_BLOCK_SZ,
ETHER_ALIGN, 0, &sc->age_rdata.age_smb_block_seg, 1,
- &nsegs, BUS_DMA_WAITOK);
+ &nsegs, BUS_DMA_NOWAIT);
if (error) {
printf("%s: could not allocate DMA'able memory for "
"SMB block, error = %i\n", device_xname(sc->sc_dev), error);
@@ -883,7 +880,7 @@ age_dma_alloc(struct age_softc *sc)
error = bus_dmamem_map(sc->sc_dmat, &sc->age_rdata.age_smb_block_seg,
nsegs, AGE_SMB_BLOCK_SZ, (void **)&sc->age_rdata.age_smb_block,
- BUS_DMA_NOWAIT);
+ BUS_DMA_NOWAIT | BUS_DMA_COHERENT);
if (error)
return ENOBUFS;
@@ -892,7 +889,7 @@ age_dma_alloc(struct age_softc *sc)
/* Load the DMA map for SMB block */
error = bus_dmamap_load(sc->sc_dmat, sc->age_cdata.age_smb_block_map,
sc->age_rdata.age_smb_block, AGE_SMB_BLOCK_SZ, NULL,
- BUS_DMA_WAITOK);
+ BUS_DMA_NOWAIT);
if (error) {
printf("%s: could not load DMA'able memory for SMB block, "
"error = %i\n", device_xname(sc->sc_dev), error);
@@ -1034,6 +1031,10 @@ age_start(struct ifnet *ifp)
if ((ifp->if_flags & (IFF_RUNNING | IFF_OACTIVE)) != IFF_RUNNING)
return;
+ if ((sc->age_flags & AGE_FLAG_LINK) == 0)
+ return;
+ if (IFQ_IS_EMPTY(&ifp->if_snd))
+ return;
enq = 0;
for (;;) {
@@ -1089,19 +1090,30 @@ age_watchdog(struct ifnet *ifp)
if (sc->age_cdata.age_tx_cnt == 0) {
printf("%s: watchdog timeout (missed Tx interrupts) "
"-- recovering\n", device_xname(sc->sc_dev));
- if (!IFQ_IS_EMPTY(&ifp->if_snd))
- age_start(ifp);
+ age_start(ifp);
return;
}
printf("%s: watchdog timeout\n", device_xname(sc->sc_dev));
ifp->if_oerrors++;
age_init(ifp);
-
- if (!IFQ_IS_EMPTY(&ifp->if_snd))
- age_start(ifp);
+ age_start(ifp);
}
+static bool
+age_shutdown(device_t self, int howto)
+{
+ struct age_softc *sc;
+ struct ifnet *ifp;
+
+ sc = device_private(self);
+ ifp = &sc->sc_ec.ec_if;
+ age_stop(ifp, 1);
+
+ return true;
+}
+
+
static int
age_ioctl(struct ifnet *ifp, u_long cmd, void *data)
{
@@ -1237,6 +1249,8 @@ age_encap(struct age_softc *sc, struct m
bus_dmamap_unload(sc->sc_dmat, map);
return ENOBUFS;
}
+ bus_dmamap_sync(sc->sc_dmat, map, 0, map->dm_mapsize,
+ BUS_DMASYNC_PREWRITE);
m = *m_head;
/* Configure Tx IP/TCP/UDP checksum offload. */
@@ -1260,36 +1274,46 @@ age_encap(struct age_softc *sc, struct m
#endif
desc = NULL;
- for (i = 0; i < nsegs; i++) {
+ KASSERT(nsegs > 0);
+ for (i = 0; ; i++) {
desc = &sc->age_rdata.age_tx_ring[prod];
desc->addr = htole64(map->dm_segs[i].ds_addr);
desc->len =
htole32(AGE_TX_BYTES(map->dm_segs[i].ds_len) | vtag);
desc->flags = htole32(cflags);
sc->age_cdata.age_tx_cnt++;
+ if (i == (nsegs - 1))
+ break;
+
+ /* sync this descriptor and go to the next one */
+ bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_tx_ring_map,
+ prod * sizeof(struct tx_desc), sizeof(struct tx_desc),
+ BUS_DMASYNC_PREWRITE);
AGE_DESC_INC(prod, AGE_TX_RING_CNT);
}
- /* Update producer index. */
- sc->age_cdata.age_tx_prod = prod;
-
- /* Set EOP on the last descriptor. */
- prod = (prod + AGE_TX_RING_CNT - 1) % AGE_TX_RING_CNT;
- desc = &sc->age_rdata.age_tx_ring[prod];
+ /* Set EOP on the last descriptor and sync it. */
desc->flags |= htole32(AGE_TD_EOP);
+ bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_tx_ring_map,
+ prod * sizeof(struct tx_desc), sizeof(struct tx_desc),
+ BUS_DMASYNC_PREWRITE);
- /* Swap dmamap of the first and the last. */
- txd = &sc->age_cdata.age_txdesc[prod];
- map = txd_last->tx_dmamap;
- txd_last->tx_dmamap = txd->tx_dmamap;
- txd->tx_dmamap = map;
- txd->tx_m = m;
+ if (nsegs > 1) {
+ /* Swap dmamap of the first and the last. */
+ txd = &sc->age_cdata.age_txdesc[prod];
+ map = txd_last->tx_dmamap;
+ txd_last->tx_dmamap = txd->tx_dmamap;
+ txd->tx_dmamap = map;
+ txd->tx_m = m;
+ KASSERT(txd_last->tx_m == NULL);
+ } else {
+ KASSERT(txd_last == &sc->age_cdata.age_txdesc[prod]);
+ txd_last->tx_m = m;
+ }
- /* Sync descriptors. */
- bus_dmamap_sync(sc->sc_dmat, map, 0, map->dm_mapsize,
- BUS_DMASYNC_PREWRITE);
- bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_tx_ring_map, 0,
- sc->age_cdata.age_tx_ring_map->dm_mapsize, BUS_DMASYNC_PREWRITE);
+ /* Update producer index. */
+ AGE_DESC_INC(prod, AGE_TX_RING_CNT);
+ sc->age_cdata.age_tx_prod = prod;
return 0;
}
@@ -1301,8 +1325,13 @@ age_txintr(struct age_softc *sc, int tpd
struct age_txdesc *txd;
int cons, prog;
- bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_tx_ring_map, 0,
- sc->age_cdata.age_tx_ring_map->dm_mapsize, BUS_DMASYNC_POSTREAD);
+
+ if (sc->age_cdata.age_tx_cnt <= 0) {
+ if (ifp->if_timer != 0)
+ printf("timer running without packets\n");
+ if (sc->age_cdata.age_tx_cnt)
+ printf("age_tx_cnt corrupted\n");
+ }
/*
* Go through our Tx list and free mbufs for those
@@ -1320,6 +1349,9 @@ age_txintr(struct age_softc *sc, int tpd
* Clear Tx descriptors, it's not required but would
* help debugging in case of Tx issues.
*/
+ bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_tx_ring_map,
+ cons * sizeof(struct tx_desc), sizeof(struct tx_desc),
+ BUS_DMASYNC_POSTWRITE);
txd->tx_desc->addr = 0;
txd->tx_desc->len = 0;
txd->tx_desc->flags = 0;
@@ -1341,10 +1373,6 @@ age_txintr(struct age_softc *sc, int tpd
*/
if (sc->age_cdata.age_tx_cnt == 0)
ifp->if_timer = 0;
-
- bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_tx_ring_map, 0,
- sc->age_cdata.age_tx_ring_map->dm_mapsize,
- BUS_DMASYNC_PREWRITE);
}
}
@@ -1957,7 +1985,8 @@ age_stats_update(struct age_softc *sc)
stat = &sc->age_stat;
bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_smb_block_map, 0,
- sc->age_cdata.age_smb_block_map->dm_mapsize, BUS_DMASYNC_POSTREAD);
+ sc->age_cdata.age_smb_block_map->dm_mapsize,
+ BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
smb = sc->age_rdata.age_smb_block;
if (smb->updated == 0)
@@ -2038,7 +2067,8 @@ age_stats_update(struct age_softc *sc)
smb->updated = 0;
bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_smb_block_map, 0,
- sc->age_cdata.age_smb_block_map->dm_mapsize, BUS_DMASYNC_PREWRITE);
+ sc->age_cdata.age_smb_block_map->dm_mapsize,
+ BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
}
static void
@@ -2163,7 +2193,8 @@ age_init_cmb_block(struct age_softc *sc)
rd = &sc->age_rdata;
memset(rd->age_cmb_block, 0, AGE_CMB_BLOCK_SZ);
bus_dmamap_sync(sc->sc_dmat, sc->age_cdata.age_cmb_block_map, 0,
- sc->age_cdata.age_cmb_block_map->dm_mapsize, BUS_DMASYNC_PREWRITE);
+ sc->age_cdata.age_cmb_block_map->dm_mapsize,
+ BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
}
static void
@@ -2185,10 +2216,10 @@ age_newbuf(struct age_softc *sc, struct
bus_dmamap_t map;
int error;
- MGETHDR(m, init ? M_WAITOK : M_DONTWAIT, MT_DATA);
+ MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return ENOBUFS;
- MCLGET(m, init ? M_WAITOK : M_DONTWAIT);
+ MCLGET(m, M_DONTWAIT);
if (!(m->m_flags & M_EXT)) {
m_freem(m);
return ENOBUFS;
