Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/gi…

…t/rdma/rdma

Pull rdma updates from Jason Gunthorpe:
 "This has been a smaller cycle than normal. One new driver was
  accepted, which is unusual, and at least one more driver remains in
  review on the list.

  Summary:

   - Driver fixes for hns, hfi1, nes, rxe, i40iw, mlx5, cxgb4,
     vmw_pvrdma

   - Many patches from MatthewW converting radix tree and IDR users to
     use xarray

   - Introduction of tracepoints to the MAD layer

   - Build large SGLs at the start for DMA mapping and get the driver to
     split them

   - Generally clean SGL handling code throughout the subsystem

   - Support for restricting RDMA devices to net namespaces for
     containers

   - Progress to remove object allocation boilerplate code from drivers

   - Change in how the mlx5 driver shows representor ports linked to VFs

   - mlx5 uapi feature to access the on chip SW ICM memory

   - Add a new driver for 'EFA'. This is HW that supports user space
     packet processing through QPs in Amazon's cloud"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: (186 commits)
  RDMA/ipoib: Allow user space differentiate between valid dev_port
  IB/core, ipoib: Do not overreact to SM LID change event
  RDMA/device: Don't fire uevent before device is fully initialized
  lib/scatterlist: Remove leftover from sg_page_iter comment
  RDMA/efa: Add driver to Kconfig/Makefile
  RDMA/efa: Add the efa module
  RDMA/efa: Add EFA verbs implementation
  RDMA/efa: Add common command handlers
  RDMA/efa: Implement functions that submit and complete admin commands
  RDMA/efa: Add the ABI definitions
  RDMA/efa: Add the com service API definitions
  RDMA/efa: Add the efa_com.h file
  RDMA/efa: Add the efa.h header file
  RDMA/efa: Add EFA device definitions
  RDMA: Add EFA related definitions
  RDMA/umem: Remove hugetlb flag
  RDMA/bnxt_re: Use core helpers to get aligned DMA address
  RDMA/i40iw: Use core helpers to get aligned DMA address within a supported page size
  RDMA/verbs: Add a DMA iterator to return aligned contiguous memory blocks
  RDMA/umem: Add API to find best driver supported page size in an MR
  ...

MAINTAINERS

@@ -745,6 +745,15 @@ S:	Supported
 F:	Documentation/networking/device_drivers/amazon/ena.txt
 F:	drivers/net/ethernet/amazon/
 
+AMAZON RDMA EFA DRIVER
+M:	Gal Pressman <[email protected]>
+R:	Yossi Leybovich <[email protected]>
+L:	[email protected]
+Q:	https://patchwork.kernel.org/project/linux-rdma/list/
+S:	Supported
+F:	drivers/infiniband/hw/efa/
+F:	include/uapi/rdma/efa-abi.h
+
 AMD CRYPTOGRAPHIC COPROCESSOR (CCP) DRIVER
 M:	Tom Lendacky <[email protected]>
 M:	Gary Hook <[email protected]>
@@ -4279,7 +4288,7 @@ S:	Supported
 F:	drivers/scsi/cxgbi/cxgb3i
 
 CXGB3 IWARP RNIC DRIVER (IW_CXGB3)
-M:	Steve Wise <swise@chelsio.com>
+M:	Potnuri Bharat Teja <bharat@chelsio.com>
 L:	[email protected]
 W:	http://www.openfabrics.org
 S:	Supported
@@ -4308,7 +4317,7 @@ S:	Supported
 F:	drivers/scsi/cxgbi/cxgb4i
 
 CXGB4 IWARP RNIC DRIVER (IW_CXGB4)
-M:	Steve Wise <swise@chelsio.com>
+M:	Potnuri Bharat Teja <bharat@chelsio.com>
 L:	[email protected]
 W:	http://www.openfabrics.org
 S:	Supported
@@ -7727,6 +7736,10 @@ F:	drivers/infiniband/
 F:	include/uapi/linux/if_infiniband.h
 F:	include/uapi/rdma/
 F:	include/rdma/
+F:	include/trace/events/ib_mad.h
+F:	include/trace/events/ib_umad.h
+F:	samples/bpf/ibumad_kern.c
+F:	samples/bpf/ibumad_user.c
 
 INGENIC JZ4780 DMA Driver
 M:	Zubair Lutfullah Kakakhel <[email protected]>

drivers/infiniband/Kconfig

@@ -93,6 +93,7 @@ source "drivers/infiniband/hw/mthca/Kconfig"
 source "drivers/infiniband/hw/qib/Kconfig"
 source "drivers/infiniband/hw/cxgb3/Kconfig"
 source "drivers/infiniband/hw/cxgb4/Kconfig"
+source "drivers/infiniband/hw/efa/Kconfig"
 source "drivers/infiniband/hw/i40iw/Kconfig"
 source "drivers/infiniband/hw/mlx4/Kconfig"
 source "drivers/infiniband/hw/mlx5/Kconfig"

drivers/infiniband/core/addr.c

@@ -45,6 +45,7 @@
 #include <net/ipv6_stubs.h>
 #include <net/ip6_route.h>
 #include <rdma/ib_addr.h>
+#include <rdma/ib_cache.h>
 #include <rdma/ib_sa.h>
 #include <rdma/ib.h>
 #include <rdma/rdma_netlink.h>

drivers/infiniband/core/cache.c

@@ -78,11 +78,22 @@ enum gid_table_entry_state {
 	GID_TABLE_ENTRY_PENDING_DEL	= 3,
 };
 
+struct roce_gid_ndev_storage {
+	struct rcu_head rcu_head;
+	struct net_device *ndev;
+};
+
 struct ib_gid_table_entry {
 	struct kref			kref;
 	struct work_struct		del_work;
 	struct ib_gid_attr		attr;
 	void				*context;
+	/* Store the ndev pointer to release reference later on in
+	 * call_rcu context because by that time gid_table_entry
+	 * and attr might be already freed. So keep a copy of it.
+	 * ndev_storage is freed by rcu callback.
+	 */
+	struct roce_gid_ndev_storage	*ndev_storage;
 	enum gid_table_entry_state	state;
 };
 
@@ -206,6 +217,20 @@ static void schedule_free_gid(struct kref *kref)
 	queue_work(ib_wq, &entry->del_work);
 }
 
+static void put_gid_ndev(struct rcu_head *head)
+{
+	struct roce_gid_ndev_storage *storage =
+		container_of(head, struct roce_gid_ndev_storage, rcu_head);
+
+	WARN_ON(!storage->ndev);
+	/* At this point its safe to release netdev reference,
+	 * as all callers working on gid_attr->ndev are done
+	 * using this netdev.
+	 */
+	dev_put(storage->ndev);
+	kfree(storage);
+}
+
 static void free_gid_entry_locked(struct ib_gid_table_entry *entry)
 {
 	struct ib_device *device = entry->attr.device;
@@ -228,8 +253,8 @@ static void free_gid_entry_locked(struct ib_gid_table_entry *entry)
 	/* Now this index is ready to be allocated */
 	write_unlock_irq(&table->rwlock);
 
-	if (entry->attr.ndev)
-		dev_put(entry->attr.ndev);
+	if (entry->ndev_storage)
+		call_rcu(&entry->ndev_storage->rcu_head, put_gid_ndev);
 	kfree(entry);
 }
 
@@ -266,14 +291,25 @@ static struct ib_gid_table_entry *
 alloc_gid_entry(const struct ib_gid_attr *attr)
 {
 	struct ib_gid_table_entry *entry;
+	struct net_device *ndev;
 
 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 	if (!entry)
 		return NULL;
+
+	ndev = rcu_dereference_protected(attr->ndev, 1);
+	if (ndev) {
+		entry->ndev_storage = kzalloc(sizeof(*entry->ndev_storage),
+					      GFP_KERNEL);
+		if (!entry->ndev_storage) {
+			kfree(entry);
+			return NULL;
+		}
+		dev_hold(ndev);
+		entry->ndev_storage->ndev = ndev;
+	}
 	kref_init(&entry->kref);
 	memcpy(&entry->attr, attr, sizeof(*attr));
-	if (entry->attr.ndev)
-		dev_hold(entry->attr.ndev);
 	INIT_WORK(&entry->del_work, free_gid_work);
 	entry->state = GID_TABLE_ENTRY_INVALID;
 	return entry;
@@ -343,6 +379,7 @@ static int add_roce_gid(struct ib_gid_table_entry *entry)
 static void del_gid(struct ib_device *ib_dev, u8 port,
 		    struct ib_gid_table *table, int ix)
 {
+	struct roce_gid_ndev_storage *ndev_storage;
 	struct ib_gid_table_entry *entry;
 
 	lockdep_assert_held(&table->lock);
@@ -360,6 +397,13 @@ static void del_gid(struct ib_device *ib_dev, u8 port,
 		table->data_vec[ix] = NULL;
 	write_unlock_irq(&table->rwlock);
 
+	ndev_storage = entry->ndev_storage;
+	if (ndev_storage) {
+		entry->ndev_storage = NULL;
+		rcu_assign_pointer(entry->attr.ndev, NULL);
+		call_rcu(&ndev_storage->rcu_head, put_gid_ndev);
+	}
+
 	if (rdma_cap_roce_gid_table(ib_dev, port))
 		ib_dev->ops.del_gid(&entry->attr, &entry->context);
 
@@ -543,30 +587,11 @@ static int __ib_cache_gid_add(struct ib_device *ib_dev, u8 port,
 int ib_cache_gid_add(struct ib_device *ib_dev, u8 port,
 		     union ib_gid *gid, struct ib_gid_attr *attr)
 {
-	struct net_device *idev;
-	unsigned long mask;
-	int ret;
-
-	idev = ib_device_get_netdev(ib_dev, port);
-	if (idev && attr->ndev != idev) {
-		union ib_gid default_gid;
-
-		/* Adding default GIDs is not permitted */
-		make_default_gid(idev, &default_gid);
-		if (!memcmp(gid, &default_gid, sizeof(*gid))) {
-			dev_put(idev);
-			return -EPERM;
-		}
-	}
-	if (idev)
-		dev_put(idev);
-
-	mask = GID_ATTR_FIND_MASK_GID |
-	       GID_ATTR_FIND_MASK_GID_TYPE |
-	       GID_ATTR_FIND_MASK_NETDEV;
+	unsigned long mask = GID_ATTR_FIND_MASK_GID |
+			     GID_ATTR_FIND_MASK_GID_TYPE |
+			     GID_ATTR_FIND_MASK_NETDEV;
 
-	ret = __ib_cache_gid_add(ib_dev, port, gid, attr, mask, false);
-	return ret;
+	return __ib_cache_gid_add(ib_dev, port, gid, attr, mask, false);
 }
 
 static int
@@ -1263,11 +1288,72 @@ struct net_device *rdma_read_gid_attr_ndev_rcu(const struct ib_gid_attr *attr)
 
 	read_lock_irqsave(&table->rwlock, flags);
 	valid = is_gid_entry_valid(table->data_vec[attr->index]);
-	if (valid && attr->ndev && (READ_ONCE(attr->ndev->flags) & IFF_UP))
-		ndev = attr->ndev;
+	if (valid) {
+		ndev = rcu_dereference(attr->ndev);
+		if (!ndev ||
+		    (ndev && ((READ_ONCE(ndev->flags) & IFF_UP) == 0)))
+			ndev = ERR_PTR(-ENODEV);
+	}
 	read_unlock_irqrestore(&table->rwlock, flags);
 	return ndev;
 }
+EXPORT_SYMBOL(rdma_read_gid_attr_ndev_rcu);
+
+static int get_lower_dev_vlan(struct net_device *lower_dev, void *data)
+{
+	u16 *vlan_id = data;
+
+	if (is_vlan_dev(lower_dev))
+		*vlan_id = vlan_dev_vlan_id(lower_dev);
+
+	/* We are interested only in first level vlan device, so
+	 * always return 1 to stop iterating over next level devices.
+	 */
+	return 1;
+}
+
+/**
+ * rdma_read_gid_l2_fields - Read the vlan ID and source MAC address
+ *			     of a GID entry.
+ *
+ * @attr:	GID attribute pointer whose L2 fields to be read
+ * @vlan_id:	Pointer to vlan id to fill up if the GID entry has
+ *		vlan id. It is optional.
+ * @smac:	Pointer to smac to fill up for a GID entry. It is optional.
+ *
+ * rdma_read_gid_l2_fields() returns 0 on success and returns vlan id
+ * (if gid entry has vlan) and source MAC, or returns error.
+ */
+int rdma_read_gid_l2_fields(const struct ib_gid_attr *attr,
+			    u16 *vlan_id, u8 *smac)
+{
+	struct net_device *ndev;
+
+	rcu_read_lock();
+	ndev = rcu_dereference(attr->ndev);
+	if (!ndev) {
+		rcu_read_unlock();
+		return -ENODEV;
+	}
+	if (smac)
+		ether_addr_copy(smac, ndev->dev_addr);
+	if (vlan_id) {
+		*vlan_id = 0xffff;
+		if (is_vlan_dev(ndev)) {
+			*vlan_id = vlan_dev_vlan_id(ndev);
+		} else {
+			/* If the netdev is upper device and if it's lower
+			 * device is vlan device, consider vlan id of the
+			 * the lower vlan device for this gid entry.
+			 */
+			netdev_walk_all_lower_dev_rcu(attr->ndev,
+					get_lower_dev_vlan, vlan_id);
+		}
+	}
+	rcu_read_unlock();
+	return 0;
+}
+EXPORT_SYMBOL(rdma_read_gid_l2_fields);
 
 static int config_non_roce_gid_cache(struct ib_device *device,
 				     u8 port, int gid_tbl_len)
@@ -1392,7 +1478,6 @@ static void ib_cache_event(struct ib_event_handler *handler,
 	    event->event == IB_EVENT_PORT_ACTIVE ||
 	    event->event == IB_EVENT_LID_CHANGE  ||
 	    event->event == IB_EVENT_PKEY_CHANGE ||
-	    event->event == IB_EVENT_SM_CHANGE   ||
 	    event->event == IB_EVENT_CLIENT_REREGISTER ||
 	    event->event == IB_EVENT_GID_CHANGE) {
 		work = kmalloc(sizeof *work, GFP_ATOMIC);