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[src-draft/trunk]: src/sys/dev/usb Do not require node pointers in every mbuf



details:   https://anonhg.NetBSD.org/src-all/rev/3f9b4f4d7308
branches:  trunk
changeset: 375708:3f9b4f4d7308
user:      Martin Husemann <martin%NetBSD.org@localhost>
date:      Sun Oct 24 13:24:14 2021 +0200

description:
Do not require node pointers in every mbuf

Broadcast/multicast and management frames should work without a concrete
VAP or nodeinfo.

diffstat:

 sys/dev/usb/usbwifi.c |  156 ++++++++++++++++++++++++-------------------------
 1 files changed, 75 insertions(+), 81 deletions(-)

diffs (truncated from 310 to 300 lines):

diff -r 427e87879c1f -r 3f9b4f4d7308 sys/dev/usb/usbwifi.c
--- a/sys/dev/usb/usbwifi.c     Sun Oct 24 13:22:24 2021 +0200
+++ b/sys/dev/usb/usbwifi.c     Sun Oct 24 13:24:14 2021 +0200
@@ -775,7 +775,7 @@ usbwifi_tx_prio_start(struct usbwifi *uw
        USBWIFIHIST_FUNC();
        struct mbuf *m = NULL;
        struct ieee80211_node *ni;
-       struct ieee80211vap *vap = NULL;
+       struct ieee80211vap *vap;
        struct ieee80211_frame *wh;
        struct usbwifi_cdata *cdata;
        struct usbwifi_single_chain_data *s_chain;
@@ -798,13 +798,12 @@ usbwifi_tx_prio_start(struct usbwifi *uw
                        break;
 
                /* Encapsulate and send data frames. */
+               vap = NULL;
                ni = M_GETCTX(m, struct ieee80211_node *);
-               KASSERTMSG(ni != NULL, "wifi mbuf w/o node: %p", m);
-               M_CLEARCTX(m);
-               vap = ni->ni_vap;
-               KASSERTMSG(vap != NULL, "wifi mbuf w/o VAP, mbuf: %p node: %p",
-                   m, ni);
-        
+               if (ni != NULL) {
+                       M_CLEARCTX(m);
+                       vap = ni->ni_vap;
+               }
                wh = mtod(m, struct ieee80211_frame *);
                type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
                qid = WME_AC_BE;
@@ -822,7 +821,8 @@ usbwifi_tx_prio_start(struct usbwifi *uw
                length = uwo_tx_prepare(uw, c, qid);
                if (length == 0) {
                        DPRINTF("uwo_tx_prepare gave zero length", 0, 0, 0, 0);
-                       if_statinc(vap->iv_ifp, if_oerrors);
+                       if (vap != NULL)
+                               if_statinc(vap->iv_ifp, if_oerrors);
                        c->uwc_ni = NULL;
                        c->uwc_mbuf = NULL;
                        break;
@@ -830,7 +830,8 @@ usbwifi_tx_prio_start(struct usbwifi *uw
 
                if (__predict_false(c->uwc_xfer == NULL)) {
                        DPRINTF("uwc_xfer is NULL", 0, 0, 0, 0);
-                       if_statinc(vap->iv_ifp, if_oerrors);
+                       if (vap != NULL)
+                               if_statinc(vap->iv_ifp, if_oerrors);
                        c->uwc_ni = NULL;
                        c->uwc_mbuf = NULL;
                        break;
@@ -844,7 +845,8 @@ usbwifi_tx_prio_start(struct usbwifi *uw
                if (err != USBD_IN_PROGRESS) {
                        DPRINTF("usbd_transfer on %#jx for %ju bytes: %jd",
                            (uintptr_t)c->uwc_buf, length, err, 0);
-                       if_statinc(vap->iv_ifp, if_oerrors);
+                       if (vap != NULL)
+                               if_statinc(vap->iv_ifp, if_oerrors);
                        break;
                }
                done_transmit = true;
@@ -855,7 +857,8 @@ usbwifi_tx_prio_start(struct usbwifi *uw
                 * If there's a BPF listener, bounce a copy of this frame
                 * to him.
                 */
-               bpf_mtap(vap->iv_ifp, m, BPF_D_OUT);
+               if (vap != NULL)
+                       bpf_mtap(vap->iv_ifp, m, BPF_D_OUT);
                m_freem(m);
 
                idx = (idx + 1) % uw->uw_tx_list_cnt;
@@ -888,19 +891,10 @@ static int
 usbwifi_transmit(struct ieee80211com *ic, struct mbuf *m)
 {
        struct usbwifi *uw = (struct usbwifi*)ic->ic_softc;
-       struct ieee80211_node *ni;
-       struct ieee80211vap *vap;
        struct ieee80211_frame *wh;
        unsigned qid, type;
 
        /* Which queue should this mbuf go on? */
-       ni = M_GETCTX(m, struct ieee80211_node *);
-       KASSERTMSG(ni != NULL, "wifi mbuf w/o node: %p", m);
-       M_CLEARCTX(m);
-       vap = ni->ni_vap;
-       KASSERTMSG(vap != NULL, "wifi mbuf w/o VAP, mbuf: %p node: %p",
-           m, ni);
-        
        wh = mtod(m, struct ieee80211_frame *);
        type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
        qid = WME_AC_BE;
@@ -944,24 +938,24 @@ usbwifi_raw_xmit(struct ieee80211_node *
 }
 
 void
-usbwifi_busy(struct usbwifi *un)
+usbwifi_busy(struct usbwifi *uw)
 {
-       struct usbwifi_private * const unp = un->uw_pri;
+       struct usbwifi_private * const uwp = uw->uw_pri;
 
-       usbwifi_isowned_core(un);
+       usbwifi_isowned_core(uw);
 
-       unp->uwp_refcnt++;
+       uwp->uwp_refcnt++;
 }
 
 void
-usbwifi_unbusy(struct usbwifi *un)
+usbwifi_unbusy(struct usbwifi *uw)
 {
-       struct usbwifi_private * const unp = un->uw_pri;
+       struct usbwifi_private * const uwp = uw->uw_pri;
 
-       usbwifi_isowned_core(un);
+       usbwifi_isowned_core(uw);
 
-       if (--unp->uwp_refcnt < 0)
-               cv_broadcast(&unp->uwp_detachcv);
+       if (--uwp->uwp_refcnt < 0)
+               cv_broadcast(&uwp->uwp_detachcv);
 }
 
 /*
@@ -1123,78 +1117,78 @@ usbwifi_tick_task(void *arg)
 /* Various accessors. */
 
 void
-usbwifi_set_dying(struct usbwifi *un, bool dying)
+usbwifi_set_dying(struct usbwifi *uw, bool dying)
 {
-       un->uw_pri->uwp_dying = dying;
+       uw->uw_pri->uwp_dying = dying;
 }
 
 void *
-usbwifi_softc(struct usbwifi *un)
+usbwifi_softc(struct usbwifi *uw)
 {
-       return un->uw_sc;
+       return uw->uw_sc;
 }
 
 bool
-usbwifi_isdying(struct usbwifi *un)
+usbwifi_isdying(struct usbwifi *uw)
 {
-       return un->uw_pri == NULL || un->uw_pri->uwp_dying;
+       return uw->uw_pri == NULL || uw->uw_pri->uwp_dying;
 }
 
 
 /* Locking. */
 
 void
-usbwifi_lock_core(struct usbwifi *un)
+usbwifi_lock_core(struct usbwifi *uw)
 {
-       mutex_enter(&un->uw_pri->uwp_core_lock);
+       mutex_enter(&uw->uw_pri->uwp_core_lock);
 }
 
 void
-usbwifi_unlock_core(struct usbwifi *un)
+usbwifi_unlock_core(struct usbwifi *uw)
 {
-       mutex_exit(&un->uw_pri->uwp_core_lock);
+       mutex_exit(&uw->uw_pri->uwp_core_lock);
 }
 
 kmutex_t *
-usbwifi_mutex_core(struct usbwifi *un)
+usbwifi_mutex_core(struct usbwifi *uw)
 {
-       return &un->uw_pri->uwp_core_lock;
+       return &uw->uw_pri->uwp_core_lock;
 }
 
 void
-usbwifi_lock_rx(struct usbwifi *un)
+usbwifi_lock_rx(struct usbwifi *uw)
 {
-       mutex_enter(&un->uw_pri->uwp_rxlock);
+       mutex_enter(&uw->uw_pri->uwp_rxlock);
 }
 
 void
-usbwifi_unlock_rx(struct usbwifi *un)
+usbwifi_unlock_rx(struct usbwifi *uw)
 {
-       mutex_exit(&un->uw_pri->uwp_rxlock);
+       mutex_exit(&uw->uw_pri->uwp_rxlock);
 }
 
 kmutex_t *
-usbwifi_mutex_rx(struct usbwifi *un)
+usbwifi_mutex_rx(struct usbwifi *uw)
 {
-       return &un->uw_pri->uwp_rxlock;
+       return &uw->uw_pri->uwp_rxlock;
 }
 
 void
-usbwifi_lock_tx(struct usbwifi *un)
+usbwifi_lock_tx(struct usbwifi *uw)
 {
-       mutex_enter(&un->uw_pri->uwp_txlock);
+       mutex_enter(&uw->uw_pri->uwp_txlock);
 }
 
 void
-usbwifi_unlock_tx(struct usbwifi *un)
+usbwifi_unlock_tx(struct usbwifi *uw)
 {
-       mutex_exit(&un->uw_pri->uwp_txlock);
+       mutex_exit(&uw->uw_pri->uwp_txlock);
 }
 
 kmutex_t *
-usbwifi_mutex_tx(struct usbwifi *un)
+usbwifi_mutex_tx(struct usbwifi *uw)
 {
-       return &un->uw_pri->uwp_txlock;
+       return &uw->uw_pri->uwp_txlock;
 }
 
 /* Autoconf management. */
@@ -1309,53 +1303,53 @@ int
 usbwifi_detach(device_t self, int flags)
 {
        USBWIFIHIST_FUNC(); USBWIFIHIST_CALLED();
-       struct usbwifi * const un = device_private(self);
-       struct usbwifi_private * const unp = un->uw_pri;
+       struct usbwifi * const uw = device_private(self);
+       struct usbwifi_private * const uwp = uw->uw_pri;
 
        /* Detached before attached finished, so just bail out. */
-       if (unp == NULL || !unp->uwp_attached)
+       if (uwp == NULL || !uwp->uwp_attached)
                return 0;
 
-       mutex_enter(&unp->uwp_core_lock);
-       unp->uwp_dying = true;
-       mutex_exit(&unp->uwp_core_lock);
+       mutex_enter(&uwp->uwp_core_lock);
+       uwp->uwp_dying = true;
+       mutex_exit(&uwp->uwp_core_lock);
 
-       ieee80211_ifdetach(&un->uw_ic);
+       ieee80211_ifdetach(&uw->uw_ic);
 
-       callout_halt(&unp->uwp_stat_ch, NULL);
-       usb_rem_task_wait(un->uw_udev, &unp->uwp_ticktask, USB_TASKQ_DRIVER,
+       callout_halt(&uwp->uwp_stat_ch, NULL);
+       usb_rem_task_wait(uw->uw_udev, &uwp->uwp_ticktask, USB_TASKQ_DRIVER,
            NULL);
 
-       mutex_enter(&unp->uwp_core_lock);
-       unp->uwp_refcnt--;
-       while (unp->uwp_refcnt >= 0) {
+       mutex_enter(&uwp->uwp_core_lock);
+       uwp->uwp_refcnt--;
+       while (uwp->uwp_refcnt >= 0) {
                /* Wait for processes to go away */
-               cv_wait(&unp->uwp_detachcv, &unp->uwp_core_lock);
+               cv_wait(&uwp->uwp_detachcv, &uwp->uwp_core_lock);
        }
-       mutex_exit(&unp->uwp_core_lock);
+       mutex_exit(&uwp->uwp_core_lock);
 
-       usbwifi_rx_list_free(un);
-       usbwifi_tx_list_free(un);
+       usbwifi_rx_list_free(uw);
+       usbwifi_tx_list_free(uw);
 
-       callout_destroy(&unp->uwp_stat_ch);
+       callout_destroy(&uwp->uwp_stat_ch);
 
-       cv_destroy(&unp->uwp_detachcv);
-       mutex_destroy(&unp->uwp_core_lock);
-       mutex_destroy(&unp->uwp_rxlock);
-       mutex_destroy(&unp->uwp_txlock);
+       cv_destroy(&uwp->uwp_detachcv);
+       mutex_destroy(&uwp->uwp_core_lock);
+       mutex_destroy(&uwp->uwp_rxlock);
+       mutex_destroy(&uwp->uwp_txlock);
 
        /* sendq destroy */
-       for (int i = 0; i < un->uw_ic.ic_txstream; i++) {
-               IFQ_PURGE(&unp->uwp_sendq[i]);
-               IFQ_LOCK_DESTROY(&unp->uwp_sendq[i]);
+       for (int i = 0; i < uw->uw_ic.ic_txstream; i++) {
+               IFQ_PURGE(&uwp->uwp_sendq[i]);
+               IFQ_LOCK_DESTROY(&uwp->uwp_sendq[i]);
        }
 
-       pmf_device_deregister(un->uw_dev);
+       pmf_device_deregister(uw->uw_dev);
 



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