Commit a727d953 authored by Navdeep Parhar's avatar Navdeep Parhar
Browse files

cxgbe(4): Fix bad races between sysctl and driver detach.

The default sysctl context setup by newbus for a device is eventually
freed by device_sysctl_fini, which runs after the device driver's detach
routine.  sysctl nodes associated with this context must not use any
resources (like driver locks, hardware access, counters, etc.) that are
released by driver detach.

There are a lot of sysctl nodes like this in cxgbe(4) and the fix is to
hang them off a context that is explicitly freed by the driver before it
releases any resource that might be used by a sysctl.

This fixes panics when running "sysctl dev.t6nex dev.cc" in a tight loop
and loading/unloading the driver in parallel.

Reported by:	Suhas Lokesha
MFC after:	1 week
Sponsored by:	Chelsio Communications
parent 301b2b02
......@@ -159,7 +159,7 @@ enum {
FW_OK = (1 << 1),
CHK_MBOX_ACCESS = (1 << 2),
MASTER_PF = (1 << 3),
ADAP_SYSCTL_CTX = (1 << 4),
/* 1 << 4 is unused, was ADAP_SYSCTL_CTX */
ADAP_ERR = (1 << 5),
BUF_PACKING_OK = (1 << 6),
IS_VF = (1 << 7),
......@@ -174,7 +174,7 @@ enum {
/* VI flags */
DOOMED = (1 << 0),
VI_INIT_DONE = (1 << 1),
VI_SYSCTL_CTX = (1 << 2),
/* 1 << 2 is unused, was VI_SYSCTL_CTX */
TX_USES_VM_WR = (1 << 3),
VI_SKIP_STATS = (1 << 4),
......@@ -332,6 +332,8 @@ struct port_info {
u_int tx_parse_error;
int fcs_reg;
uint64_t fcs_base;
struct sysctl_ctx_list ctx;
};
#define IS_MAIN_VI(vi) ((vi) == &((vi)->pi->vi[0]))
......
......@@ -249,6 +249,8 @@ struct ccr_softc {
counter_u64_t stats_sglist_error;
counter_u64_t stats_process_error;
counter_u64_t stats_sw_fallback;
struct sysctl_ctx_list ctx;
};
/*
......@@ -1819,14 +1821,12 @@ ccr_probe(device_t dev)
static void
ccr_sysctls(struct ccr_softc *sc)
{
struct sysctl_ctx_list *ctx;
struct sysctl_ctx_list *ctx = &sc->ctx;
struct sysctl_oid *oid, *port_oid;
struct sysctl_oid_list *children;
char buf[16];
int i;
ctx = device_get_sysctl_ctx(sc->dev);
/*
* dev.ccr.X.
*/
......@@ -1952,6 +1952,7 @@ ccr_attach(device_t dev)
sc = device_get_softc(dev);
sc->dev = dev;
sysctl_ctx_init(&sc->ctx);
sc->adapter = device_get_softc(device_get_parent(dev));
for_each_port(sc->adapter, i) {
ccr_init_port(sc, i);
......@@ -2018,6 +2019,7 @@ ccr_detach(device_t dev)
crypto_unregister_all(sc->cid);
sysctl_ctx_free(&sc->ctx);
mtx_destroy(&sc->lock);
counter_u64_free(sc->stats_cipher_encrypt);
counter_u64_free(sc->stats_cipher_decrypt);
......
......@@ -1122,6 +1122,7 @@ t4_attach(device_t dev)
sc = device_get_softc(dev);
sc->dev = dev;
sysctl_ctx_init(&sc->ctx);
TUNABLE_INT_FETCH("hw.cxgbe.dflags", &sc->debug_flags);
if ((pci_get_device(dev) & 0xff00) == 0x5400)
......@@ -1175,10 +1176,10 @@ t4_attach(device_t dev)
TASK_INIT(&sc->reset_task, 0, reset_adapter, sc);
sc->ctrlq_oid = SYSCTL_ADD_NODE(device_get_sysctl_ctx(sc->dev),
sc->ctrlq_oid = SYSCTL_ADD_NODE(&sc->ctx,
SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)), OID_AUTO, "ctrlq",
CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "control queues");
sc->fwq_oid = SYSCTL_ADD_NODE(device_get_sysctl_ctx(sc->dev),
sc->fwq_oid = SYSCTL_ADD_NODE(&sc->ctx,
SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)), OID_AUTO, "fwq",
CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "firmware event queue");
......@@ -1732,6 +1733,7 @@ t4_detach_common(device_t dev)
}
device_delete_children(dev);
sysctl_ctx_free(&sc->ctx);
adapter_full_uninit(sc);
if ((sc->flags & (IS_VF | FW_OK)) == FW_OK)
......@@ -2413,12 +2415,12 @@ cxgbe_vi_attach(device_t dev, struct vi_info *vi)
{
struct ifnet *ifp;
struct sbuf *sb;
struct sysctl_ctx_list *ctx;
struct sysctl_ctx_list *ctx = &vi->ctx;
struct sysctl_oid_list *children;
struct pfil_head_args pa;
struct adapter *sc = vi->adapter;
ctx = device_get_sysctl_ctx(vi->dev);
sysctl_ctx_init(ctx);
children = SYSCTL_CHILDREN(device_get_sysctl_tree(vi->dev));
vi->rxq_oid = SYSCTL_ADD_NODE(ctx, children, OID_AUTO, "rxq",
CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "NIC rx queues");
......@@ -2565,6 +2567,8 @@ cxgbe_attach(device_t dev)
struct vi_info *vi;
int i, rc;
sysctl_ctx_init(&pi->ctx);
rc = cxgbe_vi_attach(dev, &pi->vi[0]);
if (rc)
return (rc);
......@@ -2606,6 +2610,7 @@ cxgbe_vi_detach(struct vi_info *vi)
#endif
cxgbe_uninit_synchronized(vi);
callout_drain(&vi->tick);
sysctl_ctx_free(&vi->ctx);
vi_full_uninit(vi);
if_free(vi->ifp);
......@@ -2625,6 +2630,7 @@ cxgbe_detach(device_t dev)
return (rc);
device_delete_children(dev);
sysctl_ctx_free(&pi->ctx);
doom_vi(sc, &pi->vi[0]);
if (pi->flags & HAS_TRACEQ) {
......@@ -6469,11 +6475,6 @@ adapter_full_init(struct adapter *sc)
ASSERT_SYNCHRONIZED_OP(sc);
if (!(sc->flags & ADAP_SYSCTL_CTX)) {
sysctl_ctx_init(&sc->ctx);
sc->flags |= ADAP_SYSCTL_CTX;
}
/*
* queues that belong to the adapter (not any particular port).
*/
......@@ -6528,12 +6529,6 @@ adapter_full_uninit(struct adapter *sc)
{
int i;
/* Do this before freeing the adapter queues. */
if (sc->flags & ADAP_SYSCTL_CTX) {
sysctl_ctx_free(&sc->ctx);
sc->flags &= ~ADAP_SYSCTL_CTX;
}
t4_teardown_adapter_queues(sc);
for (i = 0; i < nitems(sc->tq) && sc->tq[i]; i++) {
......@@ -6626,11 +6621,6 @@ vi_full_init(struct vi_info *vi)
ASSERT_SYNCHRONIZED_OP(sc);
if (!(vi->flags & VI_SYSCTL_CTX)) {
sysctl_ctx_init(&vi->ctx);
vi->flags |= VI_SYSCTL_CTX;
}
/*
* Allocate tx/rx/fl queues for this VI.
*/
......@@ -6764,12 +6754,6 @@ vi_full_uninit(struct vi_info *vi)
free(vi->nm_rss, M_CXGBE);
}
/* Do this before freeing the VI queues. */
if (vi->flags & VI_SYSCTL_CTX) {
sysctl_ctx_free(&vi->ctx);
vi->flags &= ~VI_SYSCTL_CTX;
}
t4_teardown_vi_queues(vi);
vi->flags &= ~VI_INIT_DONE;
}
......@@ -7132,13 +7116,11 @@ static char *caps_decoder[] = {
void
t4_sysctls(struct adapter *sc)
{
struct sysctl_ctx_list *ctx;
struct sysctl_ctx_list *ctx = &sc->ctx;
struct sysctl_oid *oid;
struct sysctl_oid_list *children, *c0;
static char *doorbells = {"\20\1UDB\2WCWR\3UDBWC\4KDB"};
ctx = device_get_sysctl_ctx(sc->dev);
/*
* dev.t4nex.X.
*/
......@@ -7649,12 +7631,10 @@ t4_sysctls(struct adapter *sc)
void
vi_sysctls(struct vi_info *vi)
{
struct sysctl_ctx_list *ctx;
struct sysctl_ctx_list *ctx = &vi->ctx;
struct sysctl_oid *oid;
struct sysctl_oid_list *children;
ctx = device_get_sysctl_ctx(vi->dev);
/*
* dev.v?(cxgbe|cxl).X.
*/
......@@ -7754,7 +7734,7 @@ vi_sysctls(struct vi_info *vi)
static void
cxgbe_sysctls(struct port_info *pi)
{
struct sysctl_ctx_list *ctx;
struct sysctl_ctx_list *ctx = &pi->ctx;
struct sysctl_oid *oid;
struct sysctl_oid_list *children, *children2;
struct adapter *sc = pi->adapter;
......@@ -7762,8 +7742,6 @@ cxgbe_sysctls(struct port_info *pi)
char name[16];
static char *tc_flags = {"\20\1USER"};
ctx = device_get_sysctl_ctx(pi->dev);
/*
* dev.cxgbe.X.
*/
......
......@@ -489,6 +489,7 @@ t4vf_attach(device_t dev)
sc = device_get_softc(dev);
sc->dev = dev;
sysctl_ctx_init(&sc->ctx);
pci_enable_busmaster(dev);
pci_set_max_read_req(dev, 4096);
sc->params.pci.mps = pci_get_max_payload(dev);
......
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