[PATCH 5.13 055/104] ionic: make all rx_mode work threadsafe

Greg Kroah-Hartman
2021-08-02T14:14:07Z

From: Shannon Nelson <snelson@pensando.io>

[ Upstream commit 6840e17b8ea992453e2d6f460d403cb05d194e76 ]

Move the bulk of the code from ionic_set_rx_mode(), which
can be called from atomic context, into ionic_lif_rx_mode()
which is a safe context.

A call from the stack will get pushed off into a work thread,
but it is also possible to simultaneously have a call driven
by a queue reconfig request from an ethtool command or fw
recovery event. We add a mutex around the rx_mode work to be
sure they don't collide.

Fixes: 81dbc24147f9 ("ionic: change set_rx_mode from_ndo to can_sleep")
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../net/ethernet/pensando/ionic/ionic_lif.c | 183 ++++++++----------
.../net/ethernet/pensando/ionic/ionic_lif.h | 4 +-
2 files changed, 85 insertions(+), 102 deletions(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index af3a5368529c..7815e9034fb8 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -29,7 +29,7 @@ static const u8 ionic_qtype_versions[IONIC_QTYPE_MAX] = {
*/
};

-static void ionic_lif_rx_mode(struct ionic_lif *lif, unsigned int rx_mode);
+static void ionic_lif_rx_mode(struct ionic_lif *lif);
static int ionic_lif_addr_add(struct ionic_lif *lif, const u8 *addr);
static int ionic_lif_addr_del(struct ionic_lif *lif, const u8 *addr);
static void ionic_link_status_check(struct ionic_lif *lif);
@@ -77,7 +77,7 @@ static void ionic_lif_deferred_work(struct work_struct *work)

switch (w->type) {
case IONIC_DW_TYPE_RX_MODE:
- ionic_lif_rx_mode(lif, w->rx_mode);
+ ionic_lif_rx_mode(lif);
break;
case IONIC_DW_TYPE_RX_ADDR_ADD:
ionic_lif_addr_add(lif, w->addr);
@@ -1301,10 +1301,8 @@ static int ionic_lif_addr_del(struct ionic_lif *lif, const u8 *addr)
return 0;
}

-static int ionic_lif_addr(struct ionic_lif *lif, const u8 *addr, bool add,
- bool can_sleep)
+static int ionic_lif_addr(struct ionic_lif *lif, const u8 *addr, bool add)
{
- struct ionic_deferred_work *work;
unsigned int nmfilters;
unsigned int nufilters;

@@ -1330,97 +1328,46 @@ static int ionic_lif_addr(struct ionic_lif *lif, const u8 *addr, bool add,
lif->nucast--;
}

- if (!can_sleep) {
- work = kzalloc(sizeof(*work), GFP_ATOMIC);
- if (!work)
- return -ENOMEM;
- work->type = add ? IONIC_DW_TYPE_RX_ADDR_ADD :
- IONIC_DW_TYPE_RX_ADDR_DEL;
- memcpy(work->addr, addr, ETH_ALEN);
- netdev_dbg(lif->netdev, "deferred: rx_filter %s %pM\n",
- add ? "add" : "del", addr);
- ionic_lif_deferred_enqueue(&lif->deferred, work);
- } else {
- netdev_dbg(lif->netdev, "rx_filter %s %pM\n",
- add ? "add" : "del", addr);
- if (add)
- return ionic_lif_addr_add(lif, addr);
- else
- return ionic_lif_addr_del(lif, addr);
- }
+ netdev_dbg(lif->netdev, "rx_filter %s %pM\n",
+ add ? "add" : "del", addr);
+ if (add)
+ return ionic_lif_addr_add(lif, addr);
+ else
+ return ionic_lif_addr_del(lif, addr);

return 0;
}

static int ionic_addr_add(struct net_device *netdev, const u8 *addr)
{
- return ionic_lif_addr(netdev_priv(netdev), addr, ADD_ADDR, CAN_SLEEP);
-}
-
-static int ionic_ndo_addr_add(struct net_device *netdev, const u8 *addr)
-{
- return ionic_lif_addr(netdev_priv(netdev), addr, ADD_ADDR, CAN_NOT_SLEEP);
+ return ionic_lif_addr(netdev_priv(netdev), addr, ADD_ADDR);
}

static int ionic_addr_del(struct net_device *netdev, const u8 *addr)
{
- return ionic_lif_addr(netdev_priv(netdev), addr, DEL_ADDR, CAN_SLEEP);
+ return ionic_lif_addr(netdev_priv(netdev), addr, DEL_ADDR);
}

-static int ionic_ndo_addr_del(struct net_device *netdev, const u8 *addr)
+static void ionic_lif_rx_mode(struct ionic_lif *lif)
{
- return ionic_lif_addr(netdev_priv(netdev), addr, DEL_ADDR, CAN_NOT_SLEEP);
-}
-
-static void ionic_lif_rx_mode(struct ionic_lif *lif, unsigned int rx_mode)
-{
- struct ionic_admin_ctx ctx = {
- .work = COMPLETION_INITIALIZER_ONSTACK(ctx.work),
- .cmd.rx_mode_set = {
- .opcode = IONIC_CMD_RX_MODE_SET,
- .lif_index = cpu_to_le16(lif->index),
- .rx_mode = cpu_to_le16(rx_mode),
- },
- };
+ struct net_device *netdev = lif->netdev;
+ unsigned int nfilters;
+ unsigned int nd_flags;
char buf[128];
- int err;
+ u16 rx_mode;
int i;
#define REMAIN(__x) (sizeof(buf) - (__x))

- i = scnprintf(buf, sizeof(buf), "rx_mode 0x%04x -> 0x%04x:",
- lif->rx_mode, rx_mode);
- if (rx_mode & IONIC_RX_MODE_F_UNICAST)
- i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_UNICAST");
- if (rx_mode & IONIC_RX_MODE_F_MULTICAST)
- i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_MULTICAST");
- if (rx_mode & IONIC_RX_MODE_F_BROADCAST)
- i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_BROADCAST");
- if (rx_mode & IONIC_RX_MODE_F_PROMISC)
- i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_PROMISC");
- if (rx_mode & IONIC_RX_MODE_F_ALLMULTI)
- i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_ALLMULTI");
- netdev_dbg(lif->netdev, "lif%d %s\n", lif->index, buf);
-
- err = ionic_adminq_post_wait(lif, &ctx);
- if (err)
- netdev_warn(lif->netdev, "set rx_mode 0x%04x failed: %d\n",
- rx_mode, err);
- else
- lif->rx_mode = rx_mode;
-}
+ mutex_lock(&lif->config_lock);

-static void ionic_set_rx_mode(struct net_device *netdev, bool can_sleep)
-{
- struct ionic_lif *lif = netdev_priv(netdev);
- struct ionic_deferred_work *work;
- unsigned int nfilters;
- unsigned int rx_mode;
+ /* grab the flags once for local use */
+ nd_flags = netdev->flags;

rx_mode = IONIC_RX_MODE_F_UNICAST;
- rx_mode |= (netdev->flags & IFF_MULTICAST) ? IONIC_RX_MODE_F_MULTICAST : 0;
- rx_mode |= (netdev->flags & IFF_BROADCAST) ? IONIC_RX_MODE_F_BROADCAST : 0;
- rx_mode |= (netdev->flags & IFF_PROMISC) ? IONIC_RX_MODE_F_PROMISC : 0;
- rx_mode |= (netdev->flags & IFF_ALLMULTI) ? IONIC_RX_MODE_F_ALLMULTI : 0;
+ rx_mode |= (nd_flags & IFF_MULTICAST) ? IONIC_RX_MODE_F_MULTICAST : 0;
+ rx_mode |= (nd_flags & IFF_BROADCAST) ? IONIC_RX_MODE_F_BROADCAST : 0;
+ rx_mode |= (nd_flags & IFF_PROMISC) ? IONIC_RX_MODE_F_PROMISC : 0;
+ rx_mode |= (nd_flags & IFF_ALLMULTI) ? IONIC_RX_MODE_F_ALLMULTI : 0;

/* sync unicast addresses
* next check to see if we're in an overflow state
@@ -1429,49 +1376,83 @@ static void ionic_set_rx_mode(struct net_device *netdev, bool can_sleep)
* we remove our overflow flag and check the netdev flags
* to see if we can disable NIC PROMISC
*/
- if (can_sleep)
- __dev_uc_sync(netdev, ionic_addr_add, ionic_addr_del);
- else
- __dev_uc_sync(netdev, ionic_ndo_addr_add, ionic_ndo_addr_del);
+ __dev_uc_sync(netdev, ionic_addr_add, ionic_addr_del);
nfilters = le32_to_cpu(lif->identity->eth.max_ucast_filters);
if (netdev_uc_count(netdev) + 1 > nfilters) {
rx_mode |= IONIC_RX_MODE_F_PROMISC;
lif->uc_overflow = true;
} else if (lif->uc_overflow) {
lif->uc_overflow = false;
- if (!(netdev->flags & IFF_PROMISC))
+ if (!(nd_flags & IFF_PROMISC))
rx_mode &= ~IONIC_RX_MODE_F_PROMISC;
}

/* same for multicast */
- if (can_sleep)
- __dev_mc_sync(netdev, ionic_addr_add, ionic_addr_del);
- else
- __dev_mc_sync(netdev, ionic_ndo_addr_add, ionic_ndo_addr_del);
+ __dev_mc_sync(netdev, ionic_addr_add, ionic_addr_del);
nfilters = le32_to_cpu(lif->identity->eth.max_mcast_filters);
if (netdev_mc_count(netdev) > nfilters) {
rx_mode |= IONIC_RX_MODE_F_ALLMULTI;
lif->mc_overflow = true;
} else if (lif->mc_overflow) {
lif->mc_overflow = false;
- if (!(netdev->flags & IFF_ALLMULTI))
+ if (!(nd_flags & IFF_ALLMULTI))
rx_mode &= ~IONIC_RX_MODE_F_ALLMULTI;
}

+ i = scnprintf(buf, sizeof(buf), "rx_mode 0x%04x -> 0x%04x:",
+ lif->rx_mode, rx_mode);
+ if (rx_mode & IONIC_RX_MODE_F_UNICAST)
+ i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_UNICAST");
+ if (rx_mode & IONIC_RX_MODE_F_MULTICAST)
+ i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_MULTICAST");
+ if (rx_mode & IONIC_RX_MODE_F_BROADCAST)
+ i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_BROADCAST");
+ if (rx_mode & IONIC_RX_MODE_F_PROMISC)
+ i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_PROMISC");
+ if (rx_mode & IONIC_RX_MODE_F_ALLMULTI)
+ i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_ALLMULTI");
+ if (rx_mode & IONIC_RX_MODE_F_RDMA_SNIFFER)
+ i += scnprintf(&buf[i], REMAIN(i), " RX_MODE_F_RDMA_SNIFFER");
+ netdev_dbg(netdev, "lif%d %s\n", lif->index, buf);
+
if (lif->rx_mode != rx_mode) {
- if (!can_sleep) {
- work = kzalloc(sizeof(*work), GFP_ATOMIC);
- if (!work) {
- netdev_err(lif->netdev, "rxmode change dropped\n");
- return;
- }
- work->type = IONIC_DW_TYPE_RX_MODE;
- work->rx_mode = rx_mode;
- netdev_dbg(lif->netdev, "deferred: rx_mode\n");
- ionic_lif_deferred_enqueue(&lif->deferred, work);
- } else {
- ionic_lif_rx_mode(lif, rx_mode);
+ struct ionic_admin_ctx ctx = {
+ .work = COMPLETION_INITIALIZER_ONSTACK(ctx.work),
+ .cmd.rx_mode_set = {
+ .opcode = IONIC_CMD_RX_MODE_SET,
+ .lif_index = cpu_to_le16(lif->index),
+ },
+ };
+ int err;
+
+ ctx.cmd.rx_mode_set.rx_mode = cpu_to_le16(rx_mode);
+ err = ionic_adminq_post_wait(lif, &ctx);
+ if (err)
+ netdev_warn(netdev, "set rx_mode 0x%04x failed: %d\n",
+ rx_mode, err);
+ else
+ lif->rx_mode = rx_mode;
+ }
+
+ mutex_unlock(&lif->config_lock);
+}
+
+static void ionic_set_rx_mode(struct net_device *netdev, bool can_sleep)
+{
+ struct ionic_lif *lif = netdev_priv(netdev);
+ struct ionic_deferred_work *work;
+
+ if (!can_sleep) {
+ work = kzalloc(sizeof(*work), GFP_ATOMIC);
+ if (!work) {
+ netdev_err(lif->netdev, "rxmode change dropped\n");
+ return;
}
+ work->type = IONIC_DW_TYPE_RX_MODE;
+ netdev_dbg(lif->netdev, "deferred: rx_mode\n");
+ ionic_lif_deferred_enqueue(&lif->deferred, work);
+ } else {
+ ionic_lif_rx_mode(lif);
}
}

@@ -3058,6 +3039,7 @@ void ionic_lif_deinit(struct ionic_lif *lif)
ionic_lif_qcq_deinit(lif, lif->notifyqcq);
ionic_lif_qcq_deinit(lif, lif->adminqcq);

+ mutex_destroy(&lif->config_lock);
mutex_destroy(&lif->queue_lock);
ionic_lif_reset(lif);
}
@@ -3185,7 +3167,7 @@ static int ionic_station_set(struct ionic_lif *lif)
*/
if (!ether_addr_equal(ctx.comp.lif_getattr.mac,
netdev->dev_addr))
- ionic_lif_addr(lif, netdev->dev_addr, ADD_ADDR, CAN_SLEEP);
+ ionic_lif_addr(lif, netdev->dev_addr, ADD_ADDR);
} else {
/* Update the netdev mac with the device's mac */
memcpy(addr.sa_data, ctx.comp.lif_getattr.mac, netdev->addr_len);
@@ -3202,7 +3184,7 @@ static int ionic_station_set(struct ionic_lif *lif)

netdev_dbg(lif->netdev, "adding station MAC addr %pM\n",
netdev->dev_addr);
- ionic_lif_addr(lif, netdev->dev_addr, ADD_ADDR, CAN_SLEEP);
+ ionic_lif_addr(lif, netdev->dev_addr, ADD_ADDR);

return 0;
}
@@ -3225,6 +3207,7 @@ int ionic_lif_init(struct ionic_lif *lif)

lif->hw_index = le16_to_cpu(comp.hw_index);
mutex_init(&lif->queue_lock);
+ mutex_init(&lif->config_lock);

/* now that we have the hw_index we can figure out our doorbell page */
lif->dbid_count = le32_to_cpu(lif->ionic->ident.dev.ndbpgs_per_lif);
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.h b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
index 346506f01715..af291303bd7a 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
@@ -108,7 +108,6 @@ struct ionic_deferred_work {
struct list_head list;
enum ionic_deferred_work_type type;
union {
- unsigned int rx_mode;
u8 addr[ETH_ALEN];
u8 fw_status;
};
@@ -179,6 +178,7 @@ struct ionic_lif {
unsigned int index;
unsigned int hw_index;
struct mutex queue_lock; /* lock for queue structures */
+ struct mutex config_lock; /* lock for config actions */
spinlock_t adminq_lock; /* lock for AdminQ operations */
struct ionic_qcq *adminqcq;
struct ionic_qcq *notifyqcq;
@@ -199,7 +199,7 @@ struct ionic_lif {
unsigned int nrxq_descs;
u32 rx_copybreak;
u64 rxq_features;
- unsigned int rx_mode;
+ u16 rx_mode;
u64 hw_features;
bool registered;
bool mc_overflow;
--
2.30.2