1 files changed, 357 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/usnic/usnic_fwd.c b/drivers/infiniband/hw/usnic/usnic_fwd.c
new file mode 100644
index 000000000..18a70850b
--- /dev/null
+++ b/drivers/infiniband/hw/usnic/usnic_fwd.c
@@ -0,0 +1,357 @@
+/*
+ * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/netdevice.h>
+#include <linux/pci.h>
+
+#include "enic_api.h"
+#include "usnic_common_pkt_hdr.h"
+#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;
+
+	ufdev = kzalloc(sizeof(*ufdev), GFP_KERNEL);
+	if (!ufdev)
+		return NULL;
+
+	ufdev->pdev = pdev;
+	ufdev->netdev = pci_get_drvdata(pdev);
+	spin_lock_init(&ufdev->lock);
+	BUILD_BUG_ON(sizeof(ufdev->name) != sizeof(ufdev->netdev->name));
+	strcpy(ufdev->name, ufdev->netdev->name);
+
+	return ufdev;
+}
+
+void usnic_fwd_dev_free(struct usnic_fwd_dev *ufdev)
+{
+	kfree(ufdev);
+}
+
+void usnic_fwd_set_mac(struct usnic_fwd_dev *ufdev, const char mac[ETH_ALEN])
+{
+	spin_lock(&ufdev->lock);
+	memcpy(&ufdev->mac, mac, sizeof(ufdev->mac));
+	spin_unlock(&ufdev->lock);
+}
+
+void usnic_fwd_add_ipaddr(struct usnic_fwd_dev *ufdev, __be32 inaddr)
+{
+	spin_lock(&ufdev->lock);
+	if (!ufdev->inaddr)
+		ufdev->inaddr = inaddr;
+	spin_unlock(&ufdev->lock);
+}
+
+void usnic_fwd_del_ipaddr(struct usnic_fwd_dev *ufdev)
+{
+	spin_lock(&ufdev->lock);
+	ufdev->inaddr = 0;
+	spin_unlock(&ufdev->lock);
+}
+
+void usnic_fwd_carrier_up(struct usnic_fwd_dev *ufdev)
+{
+	spin_lock(&ufdev->lock);
+	ufdev->link_up = 1;
+	spin_unlock(&ufdev->lock);
+}
+
+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 int validate_filter_locked(struct usnic_fwd_dev *ufdev,
+					struct filter *filter)
+{
+
+	lockdep_assert_held(&ufdev->lock);
+
+	if (filter->type == FILTER_IPV4_5TUPLE) {
+		if (!(filter->u.ipv4.flags & FILTER_FIELD_5TUP_DST_AD))
+			return -EACCES;
+		if (!(filter->u.ipv4.flags & FILTER_FIELD_5TUP_DST_PT))
+			return -EBUSY;
+		else if (ufdev->inaddr == 0)
+			return -EINVAL;
+		else if (filter->u.ipv4.dst_port == 0)
+			return -ERANGE;
+		else if (ntohl(ufdev->inaddr) != filter->u.ipv4.dst_addr)
+			return -EFAULT;
+		else
+			return 0;
+	}
+
+	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;
+}
+
+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;
+	struct pci_dev *pdev;
+	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));
+
+	flow = kzalloc(sizeof(*flow), GFP_ATOMIC);
+	if (!flow)
+		return ERR_PTR(-ENOMEM);
+
+	tlv = dma_alloc_coherent(&pdev->dev, tlv_size, &tlv_pa, GFP_ATOMIC);
+	if (!tlv) {
+		usnic_err("Failed to allocate memory\n");
+		status = -ENOMEM;
+		goto out_free_flow;
+	}
+
+	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;
+	}
+
+	status = validate_filter_locked(ufdev, filter);
+	if (status) {
+		usnic_err("Failed to validate filter with status %d\n",
+				status);
+		goto out_free_tlv;
+	}
+
+	/* Issue Devcmd */
+	a0 = tlv_pa;
+	a1 = tlv_size;
+	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",
+				ufdev->name, status);
+		status = -EFAULT;
+		goto out_free_tlv;
+	} else {
+		usnic_dbg("VF %s FILTER ID:%llu", ufdev->name, a0);
+	}
+
+	flow->flow_id = (uint32_t) a0;
+	flow->vnic_idx = uaction->vnic_idx;
+	flow->ufdev = ufdev;
+
+out_free_tlv:
+	spin_unlock(&ufdev->lock);
+	dma_free_coherent(&pdev->dev, tlv_size, tlv, tlv_pa);
+	if (!status)
+		return flow;
+out_free_flow:
+	kfree(flow);
+	return ERR_PTR(status);
+}
+
+int usnic_fwd_dealloc_flow(struct usnic_fwd_flow *flow)
+{
+	int status;
+	u64 a0, a1;
+
+	a0 = flow->flow_id;
+
+	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",
+					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",
+					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",
+				flow->ufdev->name, flow->vnic_idx,
+				flow->flow_id);
+	}
+
+	kfree(flow);
+	return status;
+}
+
+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 = qp_idx;
+	a1 = CMD_QP_RQWQ;
+
+	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,
+				qp_idx,
+				status);
+	} else {
+		usnic_dbg("PF %s VNIC Index %u RQ Index: %u ENABLED",
+				netdev_name(pf_netdev),
+				vnic_idx, qp_idx);
+	}
+
+	return status;
+}
+
+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 = qp_idx;
+	a1 = CMD_QP_RQWQ;
+
+	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,
+				qp_idx,
+				status);
+	} else {
+		usnic_dbg("PF %s VNIC Index %u RQ Index: %u DISABLED",
+				netdev_name(pf_netdev),
+				vnic_idx,
+				qp_idx);
+	}
+
+	return status;
+}