IB/usnic: Push all forwarding state to usnic_fwd.[hc]

Push all of the usnic device forwarding state - such as mtu, mac - to
usnic_fwd_dev.  Furthermore, usnic_fwd.h exposes a improved interface
for rest of the usnic code.  The primary improvement is that
usnic_fwd.h's flow management interface takes in high-level *filter*
and *action* structures now, instead of low-level paramaters such as
vnic_idx, rq_idx.

Signed-off-by: Upinder Malhi <umalhi@cisco.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

2 files changed, 212 insertions, 125 deletions

diff --git a/drivers/infiniband/hw/usnic/usnic_fwd.c b/drivers/infiniband/hw/usnic/usnic_fwd.c
index 8e42216..33fdd77 100644
--- a/drivers/infiniband/hw/usnic/usnic_fwd.c
+++ b/drivers/infiniband/hw/usnic/usnic_fwd.c
@@ -23,6 +23,49 @@
 #include "usnic_fwd.h"
 #include "usnic_log.h"
 
+static int usnic_fwd_devcmd_locked(struct usnic_fwd_dev *ufdev, int vnic_idx,
+					enum vnic_devcmd_cmd cmd, u64 *a0,
+					u64 *a1)
+{
+	int status;
+	struct net_device *netdev = ufdev->netdev;
+
+	lockdep_assert_held(&ufdev->lock);
+
+	status = enic_api_devcmd_proxy_by_index(netdev,
+			vnic_idx,
+			cmd,
+			a0, a1,
+			1000);
+	if (status) {
+		if (status == ERR_EINVAL && cmd == CMD_DEL_FILTER) {
+			usnic_dbg("Dev %s vnic idx %u cmd %u already deleted",
+					ufdev->name, vnic_idx, cmd);
+		} else {
+			usnic_err("Dev %s vnic idx %u cmd %u failed with status %d\n",
+					ufdev->name, vnic_idx, cmd,
+					status);
+		}
+	} else {
+		usnic_dbg("Dev %s vnic idx %u cmd %u success",
+				ufdev->name, vnic_idx, cmd);
+	}
+
+	return status;
+}
+
+static int usnic_fwd_devcmd(struct usnic_fwd_dev *ufdev, int vnic_idx,
+				enum vnic_devcmd_cmd cmd, u64 *a0, u64 *a1)
+{
+	int status;
+
+	spin_lock(&ufdev->lock);
+	status = usnic_fwd_devcmd_locked(ufdev, vnic_idx, cmd, a0, a1);
+	spin_unlock(&ufdev->lock);
+
+	return status;
+}
+
 struct usnic_fwd_dev *usnic_fwd_dev_alloc(struct pci_dev *pdev)
 {
 	struct usnic_fwd_dev *ufdev;
@@ -34,6 +77,8 @@ struct usnic_fwd_dev *usnic_fwd_dev_alloc(struct pci_dev *pdev)
 	ufdev->pdev = pdev;
 	ufdev->netdev = pci_get_drvdata(pdev);
 	spin_lock_init(&ufdev->lock);
+	strncpy(ufdev->name, netdev_name(ufdev->netdev),
+			sizeof(ufdev->name) - 1);
 
 	return ufdev;
 }
@@ -43,200 +88,208 @@ void usnic_fwd_dev_free(struct usnic_fwd_dev *ufdev)
 	kfree(ufdev);
 }
 
-static int usnic_fwd_devcmd(struct usnic_fwd_dev *ufdev, int vnic_idx,
-				enum vnic_devcmd_cmd cmd, u64 *a0, u64 *a1)
+void usnic_fwd_set_mac(struct usnic_fwd_dev *ufdev, char mac[ETH_ALEN])
 {
-	int status;
-	struct net_device *netdev = ufdev->netdev;
+	spin_lock(&ufdev->lock);
+	memcpy(&ufdev->mac, mac, sizeof(ufdev->mac));
+	spin_unlock(&ufdev->lock);
+}
 
+void usnic_fwd_carrier_up(struct usnic_fwd_dev *ufdev)
+{
 	spin_lock(&ufdev->lock);
-	status = enic_api_devcmd_proxy_by_index(netdev,
-			vnic_idx,
-			cmd,
-			a0, a1,
-			1000);
+	ufdev->link_up = 1;
 	spin_unlock(&ufdev->lock);
-	if (status) {
-		if (status == ERR_EINVAL && cmd == CMD_DEL_FILTER) {
-			usnic_dbg("Dev %s vnic idx %u cmd %u already deleted",
-					netdev_name(netdev), vnic_idx, cmd);
-		} else {
-			usnic_err("Dev %s vnic idx %u cmd %u failed with status %d\n",
-					netdev_name(netdev), vnic_idx, cmd,
-					status);
-		}
-	} else {
-		usnic_dbg("Dev %s vnic idx %u cmd %u success",
-				netdev_name(netdev), vnic_idx,
-				cmd);
-	}
+}
 
-	return status;
+void usnic_fwd_carrier_down(struct usnic_fwd_dev *ufdev)
+{
+	spin_lock(&ufdev->lock);
+	ufdev->link_up = 0;
+	spin_unlock(&ufdev->lock);
+}
+
+void usnic_fwd_set_mtu(struct usnic_fwd_dev *ufdev, unsigned int mtu)
+{
+	spin_lock(&ufdev->lock);
+	ufdev->mtu = mtu;
+	spin_unlock(&ufdev->lock);
+}
+
+static int usnic_fwd_dev_ready_locked(struct usnic_fwd_dev *ufdev)
+{
+	lockdep_assert_held(&ufdev->lock);
+
+	if (!ufdev->link_up)
+		return -EPERM;
+
+	return 0;
+}
+
+static void fill_tlv(struct filter_tlv *tlv, struct filter *filter,
+		struct filter_action *action)
+{
+	tlv->type = CLSF_TLV_FILTER;
+	tlv->length = sizeof(struct filter);
+	*((struct filter *)&tlv->val) = *filter;
+
+	tlv = (struct filter_tlv *)((char *)tlv + sizeof(struct filter_tlv) +
+			sizeof(struct filter));
+	tlv->type = CLSF_TLV_ACTION;
+	tlv->length = sizeof(struct filter_action);
+	*((struct filter_action *)&tlv->val) = *action;
 }
 
-int usnic_fwd_add_usnic_filter(struct usnic_fwd_dev *ufdev, int vnic_idx,
-				int rq_idx, struct usnic_fwd_filter *fwd_filter,
-				struct usnic_fwd_filter_hndl **filter_hndl)
+struct usnic_fwd_flow*
+usnic_fwd_alloc_flow(struct usnic_fwd_dev *ufdev, struct filter *filter,
+				struct usnic_filter_action *uaction)
 {
-	struct filter_tlv *tlv, *tlv_va;
-	struct filter *filter;
-	struct filter_action *action;
+	struct filter_tlv *tlv;
 	struct pci_dev *pdev;
-	struct usnic_fwd_filter_hndl *usnic_filter_hndl;
-	int status;
-	u64 a0, a1;
-	u64 tlv_size;
+	struct usnic_fwd_flow *flow;
+	uint64_t a0, a1;
+	uint64_t tlv_size;
 	dma_addr_t tlv_pa;
+	int status;
 
 	pdev = ufdev->pdev;
-	tlv_size = (2*sizeof(struct filter_tlv) +
-		sizeof(struct filter) +
-		sizeof(struct filter_action));
+	tlv_size = (2*sizeof(struct filter_tlv) + sizeof(struct filter) +
+			sizeof(struct filter_action));
+
+	flow = kzalloc(sizeof(*flow), GFP_ATOMIC);
+	if (!flow)
+		return ERR_PTR(-ENOMEM);
+
 	tlv = pci_alloc_consistent(pdev, tlv_size, &tlv_pa);
 	if (!tlv) {
 		usnic_err("Failed to allocate memory\n");
-		return -ENOMEM;
+		status = -ENOMEM;
+		goto out_free_flow;
 	}
 
-	usnic_filter_hndl = kzalloc(sizeof(*usnic_filter_hndl), GFP_ATOMIC);
-	if (!usnic_filter_hndl) {
-		usnic_err("Failed to allocate memory for hndl\n");
-		pci_free_consistent(pdev, tlv_size, tlv, tlv_pa);
-		return -ENOMEM;
+	fill_tlv(tlv, filter, &uaction->action);
+
+	spin_lock(&ufdev->lock);
+	status = usnic_fwd_dev_ready_locked(ufdev);
+	if (status) {
+		usnic_err("Forwarding dev %s not ready with status %d\n",
+				ufdev->name, status);
+		goto out_free_tlv;
 	}
 
-	tlv_va = tlv;
+	/* Issue Devcmd */
 	a0 = tlv_pa;
 	a1 = tlv_size;
-	memset(tlv, 0, tlv_size);
-	tlv->type = CLSF_TLV_FILTER;
-	tlv->length = sizeof(struct filter);
-	filter = (struct filter *)&tlv->val;
-	filter->type = FILTER_USNIC_ID;
-	filter->u.usnic.ethtype = USNIC_ROCE_ETHERTYPE;
-	filter->u.usnic.flags = FILTER_FIELD_USNIC_ETHTYPE |
-					FILTER_FIELD_USNIC_ID |
-					FILTER_FIELD_USNIC_PROTO;
-	filter->u.usnic.proto_version = (USNIC_ROCE_GRH_VER <<
-						USNIC_ROCE_GRH_VER_SHIFT)
-							| USNIC_PROTO_VER;
-	filter->u.usnic.usnic_id = fwd_filter->port_num;
-	tlv = (struct filter_tlv *)((char *)tlv + sizeof(struct filter_tlv) +
-			sizeof(struct filter));
-	tlv->type = CLSF_TLV_ACTION;
-	tlv->length = sizeof(struct filter_action);
-	action = (struct filter_action *)&tlv->val;
-	action->type = FILTER_ACTION_RQ_STEERING;
-	action->u.rq_idx = rq_idx;
-
-	status = usnic_fwd_devcmd(ufdev, vnic_idx, CMD_ADD_FILTER, &a0, &a1);
-	pci_free_consistent(pdev, tlv_size, tlv_va, tlv_pa);
+	status = usnic_fwd_devcmd_locked(ufdev, uaction->vnic_idx,
+						CMD_ADD_FILTER, &a0, &a1);
 	if (status) {
 		usnic_err("VF %s Filter add failed with status:%d",
-				pci_name(pdev),
-				status);
-		kfree(usnic_filter_hndl);
-		return status;
+				ufdev->name, status);
+		status = -EFAULT;
+		goto out_free_tlv;
 	} else {
-		usnic_dbg("VF %s FILTER ID:%u",
-				pci_name(pdev),
-				(u32)a0);
+		usnic_dbg("VF %s FILTER ID:%llu", ufdev->name, a0);
 	}
 
-	usnic_filter_hndl->type = FILTER_USNIC_ID;
-	usnic_filter_hndl->id = (u32)a0;
-	usnic_filter_hndl->vnic_idx = vnic_idx;
-	usnic_filter_hndl->ufdev = ufdev;
-	usnic_filter_hndl->filter = fwd_filter;
-	*filter_hndl = usnic_filter_hndl;
+	flow->flow_id = (uint32_t) a0;
+	flow->vnic_idx = uaction->vnic_idx;
+	flow->ufdev = ufdev;
 
-	return status;
+out_free_tlv:
+	spin_unlock(&ufdev->lock);
+	pci_free_consistent(pdev, tlv_size, tlv, tlv_pa);
+	if (!status)
+		return flow;
+out_free_flow:
+	kfree(flow);
+	return ERR_PTR(status);
 }
 
-int usnic_fwd_del_filter(struct usnic_fwd_filter_hndl *filter_hndl)
+int usnic_fwd_dealloc_flow(struct usnic_fwd_flow *flow)
 {
 	int status;
 	u64 a0, a1;
-	struct net_device *netdev;
 
-	netdev = filter_hndl->ufdev->netdev;
-	a0 = filter_hndl->id;
+	a0 = flow->flow_id;
 
-	status = usnic_fwd_devcmd(filter_hndl->ufdev, filter_hndl->vnic_idx,
+	status = usnic_fwd_devcmd(flow->ufdev, flow->vnic_idx,
 					CMD_DEL_FILTER, &a0, &a1);
 	if (status) {
 		if (status == ERR_EINVAL) {
 			usnic_dbg("Filter %u already deleted for VF Idx %u pf: %s status: %d",
-					filter_hndl->id, filter_hndl->vnic_idx,
-					netdev_name(netdev), status);
-			status = 0;
-			kfree(filter_hndl);
+					flow->flow_id, flow->vnic_idx,
+					flow->ufdev->name, status);
 		} else {
 			usnic_err("PF %s VF Idx %u Filter: %u FILTER DELETE failed with status %d",
-					netdev_name(netdev),
-					filter_hndl->vnic_idx, filter_hndl->id,
-					status);
+					flow->ufdev->name, flow->vnic_idx,
+					flow->flow_id, status);
 		}
+		status = 0;
+		/*
+		 * Log the error and fake success to the caller because if
+		 * a flow fails to be deleted in the firmware, it is an
+		 * unrecoverable error.
+		 */
 	} else {
 		usnic_dbg("PF %s VF Idx %u Filter: %u FILTER DELETED",
-				netdev_name(netdev), filter_hndl->vnic_idx,
-				filter_hndl->id);
-		kfree(filter_hndl);
+				flow->ufdev->name, flow->vnic_idx,
+				flow->flow_id);
 	}
 
+	kfree(flow);
 	return status;
 }
 
-int usnic_fwd_enable_rq(struct usnic_fwd_dev *ufdev, int vnic_idx, int rq_idx)
+int usnic_fwd_enable_qp(struct usnic_fwd_dev *ufdev, int vnic_idx, int qp_idx)
 {
 	int status;
 	struct net_device *pf_netdev;
 	u64 a0, a1;
 
 	pf_netdev = ufdev->netdev;
-	a0 = rq_idx;
+	a0 = qp_idx;
 	a1 = CMD_QP_RQWQ;
 
-	status = usnic_fwd_devcmd(ufdev, vnic_idx, CMD_QP_ENABLE, &a0, &a1);
-
+	status = usnic_fwd_devcmd(ufdev, vnic_idx, CMD_QP_ENABLE,
+						&a0, &a1);
 	if (status) {
 		usnic_err("PF %s VNIC Index %u RQ Index: %u ENABLE Failed with status %d",
 				netdev_name(pf_netdev),
 				vnic_idx,
-				rq_idx,
+				qp_idx,
 				status);
 	} else {
 		usnic_dbg("PF %s VNIC Index %u RQ Index: %u ENABLED",
 				netdev_name(pf_netdev),
-				vnic_idx, rq_idx);
+				vnic_idx, qp_idx);
 	}
 
 	return status;
 }
 
-int usnic_fwd_disable_rq(struct usnic_fwd_dev *ufdev, int vnic_idx, int rq_idx)
+int usnic_fwd_disable_qp(struct usnic_fwd_dev *ufdev, int vnic_idx, int qp_idx)
 {
 	int status;
 	u64 a0, a1;
 	struct net_device *pf_netdev;
 
 	pf_netdev = ufdev->netdev;
-	a0 = rq_idx;
+	a0 = qp_idx;
 	a1 = CMD_QP_RQWQ;
 
-	status = usnic_fwd_devcmd(ufdev, vnic_idx, CMD_QP_DISABLE, &a0, &a1);
-
+	status = usnic_fwd_devcmd(ufdev, vnic_idx, CMD_QP_DISABLE,
+			&a0, &a1);
 	if (status) {
 		usnic_err("PF %s VNIC Index %u RQ Index: %u DISABLE Failed with status %d",
 				netdev_name(pf_netdev),
 				vnic_idx,
-				rq_idx,
+				qp_idx,
 				status);
 	} else {
 		usnic_dbg("PF %s VNIC Index %u RQ Index: %u DISABLED",
 				netdev_name(pf_netdev),
 				vnic_idx,
-				rq_idx);
+				qp_idx);
 	}
 
 	return status;
diff --git a/drivers/infiniband/hw/usnic/usnic_fwd.h b/drivers/infiniband/hw/usnic/usnic_fwd.h
index 6973901..b146eb9 100644
--- a/drivers/infiniband/hw/usnic/usnic_fwd.h
+++ b/drivers/infiniband/hw/usnic/usnic_fwd.h
@@ -20,39 +20,73 @@
 #define USNIC_FWD_H_
 
 #include <linux/if.h>
+#include <linux/netdevice.h>
 #include <linux/pci.h>
-#include <linux/spinlock.h>
+#include <linux/in.h>
 
 #include "usnic_abi.h"
+#include "usnic_common_pkt_hdr.h"
 #include "vnic_devcmd.h"
 
 struct usnic_fwd_dev {
 	struct pci_dev			*pdev;
 	struct net_device		*netdev;
 	spinlock_t			lock;
+	/*
+	 * The following fields can be read directly off the device.
+	 * However, they should be set by a accessor function, except name,
+	 * which cannot be changed.
+	 */
+	bool				link_up;
+	char				mac[ETH_ALEN];
+	unsigned int			mtu;
+	char				name[IFNAMSIZ+1];
 };
 
-struct usnic_fwd_filter {
-	enum usnic_transport_type	transport;
-	u16				port_num;
+struct usnic_fwd_flow {
+	uint32_t			flow_id;
+	struct usnic_fwd_dev		*ufdev;
+	unsigned int			vnic_idx;
 };
 
-struct usnic_fwd_filter_hndl {
-	enum filter_type		type;
-	u32				id;
-	u32				vnic_idx;
-	struct usnic_fwd_dev		*ufdev;
-	struct list_head		link;
-	struct usnic_fwd_filter		*filter;
+struct usnic_filter_action {
+	int				vnic_idx;
+	struct filter_action		action;
 };
 
 struct usnic_fwd_dev *usnic_fwd_dev_alloc(struct pci_dev *pdev);
 void usnic_fwd_dev_free(struct usnic_fwd_dev *ufdev);
-int usnic_fwd_add_usnic_filter(struct usnic_fwd_dev *ufdev, int vnic_idx,
-				int rq_idx, struct usnic_fwd_filter *filter,
-				struct usnic_fwd_filter_hndl **filter_hndl);
-int usnic_fwd_del_filter(struct usnic_fwd_filter_hndl *filter_hndl);
-int usnic_fwd_enable_rq(struct usnic_fwd_dev *ufdev, int vnic_idx, int rq_idx);
-int usnic_fwd_disable_rq(struct usnic_fwd_dev *ufdev, int vnic_idx, int rq_idx);
+
+void usnic_fwd_set_mac(struct usnic_fwd_dev *ufdev, char mac[ETH_ALEN]);
+void usnic_fwd_carrier_up(struct usnic_fwd_dev *ufdev);
+void usnic_fwd_carrier_down(struct usnic_fwd_dev *ufdev);
+void usnic_fwd_set_mtu(struct usnic_fwd_dev *ufdev, unsigned int mtu);
+
+/*
+ * Allocate a flow on this forwarding device. Whoever calls this function,
+ * must monitor netdev events on ufdev's netdevice. If NETDEV_REBOOT or
+ * NETDEV_DOWN is seen, flow will no longer function and must be
+ * immediately freed by calling usnic_dealloc_flow.
+ */
+struct usnic_fwd_flow*
+usnic_fwd_alloc_flow(struct usnic_fwd_dev *ufdev, struct filter *filter,
+				struct usnic_filter_action *action);
+int usnic_fwd_dealloc_flow(struct usnic_fwd_flow *flow);
+int usnic_fwd_enable_qp(struct usnic_fwd_dev *ufdev, int vnic_idx, int qp_idx);
+int usnic_fwd_disable_qp(struct usnic_fwd_dev *ufdev, int vnic_idx, int qp_idx);
+
+static inline void usnic_fwd_init_usnic_filter(struct filter *filter,
+						uint32_t usnic_id)
+{
+	filter->type = FILTER_USNIC_ID;
+	filter->u.usnic.ethtype = USNIC_ROCE_ETHERTYPE;
+	filter->u.usnic.flags = FILTER_FIELD_USNIC_ETHTYPE |
+				FILTER_FIELD_USNIC_ID |
+				FILTER_FIELD_USNIC_PROTO;
+	filter->u.usnic.proto_version = (USNIC_ROCE_GRH_VER <<
+					 USNIC_ROCE_GRH_VER_SHIFT) |
+					 USNIC_PROTO_VER;
+	filter->u.usnic.usnic_id = usnic_id;
+}
 
 #endif /* !USNIC_FWD_H_ */