Date: Mon, 4 Mar 2013 02:36:04 +0000 (UTC) From: Adrian Chadd <adrian@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r247765 - user/adrian/net80211_tx/sys/net80211 Message-ID: <201303040236.r242a4wk088997@svn.freebsd.org>
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Author: adrian Date: Mon Mar 4 02:36:04 2013 New Revision: 247765 URL: http://svnweb.freebsd.org/changeset/base/247765 Log: Wrap some locks around the mesh transmit path. The mesh forwarding frames path is a little special - one of the paths involves rewriting the DA and then forwarding the frame direct to the parent interface rather than going via the vap layer. This is likely not a "good" solution moving forward, but I'll talk with Monthadar about how to fix this. So for now, just wrap the parent call in the TX lock. Modified: user/adrian/net80211_tx/sys/net80211/ieee80211_mesh.c Modified: user/adrian/net80211_tx/sys/net80211/ieee80211_mesh.c ============================================================================== --- user/adrian/net80211_tx/sys/net80211/ieee80211_mesh.c Mon Mar 4 02:21:34 2013 (r247764) +++ user/adrian/net80211_tx/sys/net80211/ieee80211_mesh.c Mon Mar 4 02:36:04 2013 (r247765) @@ -1045,6 +1045,8 @@ mesh_transmit_to_gate(struct ieee80211va struct ether_header *eh; int error; + IEEE80211_TX_UNLOCK_ASSERT(ic); + eh = mtod(m, struct ether_header *); ni = ieee80211_mesh_find_txnode(vap, rt_gate->rt_dest); if (ni == NULL) { @@ -1131,6 +1133,8 @@ mesh_transmit_to_gate(struct ieee80211va } } #endif /* IEEE80211_SUPPORT_SUPERG */ + + IEEE80211_TX_LOCK(ic); if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { /* * Encapsulate the packet in prep for transmission. @@ -1143,6 +1147,7 @@ mesh_transmit_to_gate(struct ieee80211va } } error = ieee80211_parent_transmit(ic, m); + IEEE80211_TX_UNLOCK(ic); if (error != 0) { ieee80211_free_node(ni); } else { @@ -1169,6 +1174,8 @@ ieee80211_mesh_forward_to_gates(struct i struct ieee80211_mesh_gate_route *gr = NULL, *gr_next; struct mbuf *m, *mcopy, *next; + IEEE80211_TX_UNLOCK_ASSERT(ic); + KASSERT( rt_dest->rt_flags == IEEE80211_MESHRT_FLAGS_DISCOVER, ("Route is not marked with IEEE80211_MESHRT_FLAGS_DISCOVER")); @@ -1246,6 +1253,9 @@ mesh_forward(struct ieee80211vap *vap, s struct ieee80211_node *ni; int err; + /* This is called from the RX path - don't hold this lock */ + IEEE80211_TX_UNLOCK_ASSERT(ic); + /* * mesh ttl of 1 means we are the last one receving it, * according to amendment we decrement and then check if @@ -1317,7 +1327,20 @@ mesh_forward(struct ieee80211vap *vap, s /* XXX do we know m_nextpkt is NULL? */ mcopy->m_pkthdr.rcvif = (void *) ni; + + /* + * XXX this bypasses all of the VAP TX handling; it passes frames + * directly to the parent interface. + * + * Because of this, there's no TX lock being held as there's no + * encaps state being used. + * + * Doing a direct parent transmit may not be the correct thing + * to do here; we'll have to re-think this soon. + */ + IEEE80211_TX_LOCK(ic); err = ieee80211_parent_transmit(ic, mcopy); + IEEE80211_TX_UNLOCK(ic); if (err != 0) { /* NB: IFQ_HANDOFF reclaims mbuf */ ieee80211_free_node(ni); @@ -1454,6 +1477,10 @@ mesh_recv_indiv_data_to_fwrd(struct ieee struct ieee80211_qosframe_addr4 *qwh; struct ieee80211_mesh_state *ms = vap->iv_mesh; struct ieee80211_mesh_route *rt_meshda, *rt_meshsa; + struct ieee80211com *ic = vap->iv_ic; + + /* This is called from the RX path - don't hold this lock */ + IEEE80211_TX_UNLOCK_ASSERT(ic); qwh = (struct ieee80211_qosframe_addr4 *)wh; @@ -1509,8 +1536,12 @@ mesh_recv_indiv_data_to_me(struct ieee80 const struct ieee80211_meshcntl_ae10 *mc10; struct ieee80211_mesh_state *ms = vap->iv_mesh; struct ieee80211_mesh_route *rt; + struct ieee80211com *ic = vap->iv_ic; int ae; + /* This is called from the RX path - don't hold this lock */ + IEEE80211_TX_UNLOCK_ASSERT(ic); + qwh = (struct ieee80211_qosframe_addr4 *)wh; mc10 = (const struct ieee80211_meshcntl_ae10 *)mc; @@ -1572,6 +1603,10 @@ mesh_recv_group_data(struct ieee80211vap { #define MC01(mc) ((const struct ieee80211_meshcntl_ae01 *)mc) struct ieee80211_mesh_state *ms = vap->iv_mesh; + struct ieee80211com *ic = vap->iv_ic; + + /* This is called from the RX path - don't hold this lock */ + IEEE80211_TX_UNLOCK_ASSERT(ic); mesh_forward(vap, m, mc); @@ -1618,6 +1653,9 @@ mesh_input(struct ieee80211_node *ni, st need_tap = 1; /* mbuf need to be tapped. */ type = -1; /* undefined */ + /* This is called from the RX path - don't hold this lock */ + IEEE80211_TX_UNLOCK_ASSERT(ic); + if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
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