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cxgbe(4): Fix tracing with netlink enabled kernels.

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1. The tracing ifnet's name must match the nexus name.  One way to do
   this is to not use a unit number.

2. Do not hold the tracer lock around ether_ifattach or ether_ifdetach.
   netlink calls back into the driver (see stack below) and that leads
   to illegal lock recursion.

   tracer_ioctl
   if_ioctl
   get_operstate_ether
   get_operstate
   dump_iface
   rtnl_handle_ifevent
   rtnl_handle_ifattach
   if_attach_internal
   if_attach
   ether_ifattach
   t4_cloner_create

MFC after:	3 days
Sponsored by:	Chelsio Communications
This commit is contained in:
Navdeep Parhar 2023-09-09 12:39:15 -07:00
parent f415a5c1bd
commit e203cb393f
1 changed files with 7 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

21
sys/dev/cxgbe/t4_tracer.c
View file

@ -138,7 +138,7 @@ t4_cloner_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
struct match_rr mrr;
struct adapter *sc;
if_t ifp;
int rc, unit;
int rc;
const uint8_t lla[ETHER_ADDR_LEN] = {0, 0, 0, 0, 0, 0};
mrr.name = name;
@ -166,21 +166,14 @@ t4_cloner_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
goto done;
}
unit = -1;
rc = ifc_alloc_unit(ifc, &unit);
if (rc != 0)
goto done;
ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
ifc_free_unit(ifc, unit);
rc = ENOMEM;
goto done;
}
/* Note that if_xname is not <if_dname><if_dunit>. */
if_initname(ifp, name, unit);
/* Note that if_xname is identical to the nexus nameunit */
if_initname(ifp, name, -1);
if_setdname(ifp, t4_cloner_name);
if_setinitfn(ifp, tracer_init);
if_setflags(ifp, IFF_SIMPLEX | IFF_DRV_RUNNING);
@ -192,12 +185,14 @@ t4_cloner_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
tracer_media_status);
ifmedia_add(&sc->media, IFM_ETHER | IFM_FDX | IFM_NONE, 0, NULL);
ifmedia_set(&sc->media, IFM_ETHER | IFM_FDX | IFM_NONE);
sx_xunlock(&t4_trace_lock);
ether_ifattach(ifp, lla);
sx_xlock(&t4_trace_lock);
mtx_lock(&sc->ifp_lock);
if_setsoftc(ifp, sc);
sc->ifp = ifp;
mtx_unlock(&sc->ifp_lock);
rc = 0;
done:
sx_xunlock(&t4_trace_lock);
end_synchronized_op(sc, 0);
@ -208,7 +203,6 @@ static int
t4_cloner_destroy(struct if_clone *ifc, if_t ifp)
{
struct adapter *sc;
int unit = if_getdunit(ifp);
sx_xlock(&t4_trace_lock);
sc = if_getsoftc(ifp);
@ -219,10 +213,9 @@ t4_cloner_destroy(struct if_clone *ifc, if_t ifp)
mtx_unlock(&sc->ifp_lock);
ifmedia_removeall(&sc->media);
}
sx_xunlock(&t4_trace_lock);
ether_ifdetach(ifp);
if_free(ifp);
ifc_free_unit(ifc, unit);
sx_xunlock(&t4_trace_lock);
return (0);
}