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Make sure at least two tx slots are free before sending the mbuf since an

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additional frame may be sent for 80211 protection.
This commit is contained in:
Andrew Thompson 2009-02-23 23:46:56 +00:00
parent 498657cff2
commit 96ca458f65
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=188969
4 changed files with 22 additions and 20 deletions
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20
sys/dev/usb/wlan/if_rum.c
View File

@ -1167,10 +1167,6 @@ rum_tx_raw(struct rum_softc *sc, struct mbuf *m0, struct ieee80211_node *ni,
RUM_LOCK_ASSERT(sc, MA_OWNED);
KASSERT(params != NULL, ("no raw xmit params"));
data = STAILQ_FIRST(&sc->tx_free);
STAILQ_REMOVE_HEAD(&sc->tx_free, next);
sc->tx_nfree--;
rate = params->ibp_rate0 & IEEE80211_RATE_VAL;
/* XXX validate */
if (rate == 0) {
@ -1185,13 +1181,17 @@ rum_tx_raw(struct rum_softc *sc, struct mbuf *m0, struct ieee80211_node *ni,
params->ibp_flags & IEEE80211_BPF_RTS ?
IEEE80211_PROT_RTSCTS : IEEE80211_PROT_CTSONLY,
rate);
if (error) {
if (error || sc->tx_nfree == 0) {
m_freem(m0);
return error;
return ENOBUFS;
}
flags |= RT2573_TX_LONG_RETRY | RT2573_TX_IFS_SIFS;
}
data = STAILQ_FIRST(&sc->tx_free);
STAILQ_REMOVE_HEAD(&sc->tx_free, next);
sc->tx_nfree--;
data->m = m0;
data->ni = ni;
data->rate = rate;
@ -1254,9 +1254,9 @@ rum_tx_data(struct rum_softc *sc, struct mbuf *m0, struct ieee80211_node *ni)
prot = ic->ic_protmode;
if (prot != IEEE80211_PROT_NONE) {
error = rum_sendprot(sc, m0, ni, prot, rate);
if (error) {
if (error || sc->tx_nfree == 0) {
m_freem(m0);
return error;
return ENOBUFS;
}
flags |= RT2573_TX_LONG_RETRY | RT2573_TX_IFS_SIFS;
}
@ -1306,7 +1306,7 @@ rum_start(struct ifnet *ifp)
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
if (m == NULL)
break;
if (sc->tx_nfree == 0) {
if (sc->tx_nfree < RUM_TX_MINFREE) {
IFQ_DRV_PREPEND(&ifp->if_snd, m);
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
break;
@ -2149,7 +2149,7 @@ rum_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
ieee80211_free_node(ni);
return ENETDOWN;
}
if (sc->tx_nfree == 0) {
if (sc->tx_nfree < RUM_TX_MINFREE) {
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
RUM_UNLOCK(sc);
m_freem(m);

1
sys/dev/usb/wlan/if_rumvar.h
View File

@ -18,6 +18,7 @@
*/
#define RUM_TX_LIST_COUNT 8
#define RUM_TX_MINFREE 2
struct rum_rx_radiotap_header {
struct ieee80211_radiotap_header wr_ihdr;

20
sys/dev/usb/wlan/if_ural.c
View File

@ -1243,10 +1243,6 @@ ural_tx_raw(struct ural_softc *sc, struct mbuf *m0, struct ieee80211_node *ni,
RAL_LOCK_ASSERT(sc, MA_OWNED);
KASSERT(params != NULL, ("no raw xmit params"));
data = STAILQ_FIRST(&sc->tx_free);
STAILQ_REMOVE_HEAD(&sc->tx_free, next);
sc->tx_nfree--;
rate = params->ibp_rate0 & IEEE80211_RATE_VAL;
/* XXX validate */
if (rate == 0) {
@ -1261,13 +1257,17 @@ ural_tx_raw(struct ural_softc *sc, struct mbuf *m0, struct ieee80211_node *ni,
params->ibp_flags & IEEE80211_BPF_RTS ?
IEEE80211_PROT_RTSCTS : IEEE80211_PROT_CTSONLY,
rate);
if (error) {
if (error || sc->tx_nfree == 0) {
m_freem(m0);
return error;
return ENOBUFS;
}
flags |= RAL_TX_IFS_SIFS;
}
data = STAILQ_FIRST(&sc->tx_free);
STAILQ_REMOVE_HEAD(&sc->tx_free, next);
sc->tx_nfree--;
data->m = m0;
data->ni = ni;
data->rate = rate;
@ -1328,9 +1328,9 @@ ural_tx_data(struct ural_softc *sc, struct mbuf *m0, struct ieee80211_node *ni)
prot = ic->ic_protmode;
if (prot != IEEE80211_PROT_NONE) {
error = ural_sendprot(sc, m0, ni, prot, rate);
if (error) {
if (error || sc->tx_nfree == 0) {
m_freem(m0);
return error;
return ENOBUFS;
}
flags |= RAL_TX_IFS_SIFS;
}
@ -1380,7 +1380,7 @@ ural_start(struct ifnet *ifp)
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
if (m == NULL)
break;
if (sc->tx_nfree == 0) {
if (sc->tx_nfree < RAL_TX_MINFREE) {
IFQ_DRV_PREPEND(&ifp->if_snd, m);
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
break;
@ -2235,7 +2235,7 @@ ural_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
ieee80211_free_node(ni);
return ENETDOWN;
}
if (sc->tx_nfree == 0) {
if (sc->tx_nfree < RAL_TX_MINFREE) {
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
RAL_UNLOCK(sc);
m_freem(m);

1
sys/dev/usb/wlan/if_uralvar.h
View File

@ -18,6 +18,7 @@
*/
#define RAL_TX_LIST_COUNT 8
#define RAL_TX_MINFREE 2
#define URAL_SCAN_START 1
#define URAL_SCAN_END 2