IB/usnic: Add Cisco VIC low-level hardware driver

This adds a driver that allows userspace to use UD-like QPs over a
proprietary Cisco transport with Cisco's Virtual Interface Cards (VICs),
including VIC 1240 and 1280 cards.

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

1 files changed, 243 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 000000000000..8e42216362e7
--- /dev/null
+++ b/drivers/infiniband/hw/usnic/usnic_fwd.c
@@ -0,0 +1,243 @@
+/*
+ * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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"
+
+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);
+
+	return ufdev;
+}
+
+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)
+{
+	int status;
+	struct net_device *netdev = ufdev->netdev;
+
+	spin_lock(&ufdev->lock);
+	status = enic_api_devcmd_proxy_by_index(netdev,
+			vnic_idx,
+			cmd,
+			a0, a1,
+			1000);
+	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;
+}
+
+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 filter_tlv *tlv, *tlv_va;
+	struct filter *filter;
+	struct filter_action *action;
+	struct pci_dev *pdev;
+	struct usnic_fwd_filter_hndl *usnic_filter_hndl;
+	int status;
+	u64 a0, a1;
+	u64 tlv_size;
+	dma_addr_t tlv_pa;
+
+	pdev = ufdev->pdev;
+	tlv_size = (2*sizeof(struct filter_tlv) +
+		sizeof(struct filter) +
+		sizeof(struct filter_action));
+	tlv = pci_alloc_consistent(pdev, tlv_size, &tlv_pa);
+	if (!tlv) {
+		usnic_err("Failed to allocate memory\n");
+		return -ENOMEM;
+	}
+
+	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;
+	}
+
+	tlv_va = tlv;
+	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);
+	if (status) {
+		usnic_err("VF %s Filter add failed with status:%d",
+				pci_name(pdev),
+				status);
+		kfree(usnic_filter_hndl);
+		return status;
+	} else {
+		usnic_dbg("VF %s FILTER ID:%u",
+				pci_name(pdev),
+				(u32)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;
+
+	return status;
+}
+
+int usnic_fwd_del_filter(struct usnic_fwd_filter_hndl *filter_hndl)
+{
+	int status;
+	u64 a0, a1;
+	struct net_device *netdev;
+
+	netdev = filter_hndl->ufdev->netdev;
+	a0 = filter_hndl->id;
+
+	status = usnic_fwd_devcmd(filter_hndl->ufdev, filter_hndl->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);
+		} 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);
+		}
+	} 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);
+	}
+
+	return status;
+}
+
+int usnic_fwd_enable_rq(struct usnic_fwd_dev *ufdev, int vnic_idx, int rq_idx)
+{
+	int status;
+	struct net_device *pf_netdev;
+	u64 a0, a1;
+
+	pf_netdev = ufdev->netdev;
+	a0 = rq_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,
+				rq_idx,
+				status);
+	} else {
+		usnic_dbg("PF %s VNIC Index %u RQ Index: %u ENABLED",
+				netdev_name(pf_netdev),
+				vnic_idx, rq_idx);
+	}
+
+	return status;
+}
+
+int usnic_fwd_disable_rq(struct usnic_fwd_dev *ufdev, int vnic_idx, int rq_idx)
+{
+	int status;
+	u64 a0, a1;
+	struct net_device *pf_netdev;
+
+	pf_netdev = ufdev->netdev;
+	a0 = rq_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,
+				rq_idx,
+				status);
+	} else {
+		usnic_dbg("PF %s VNIC Index %u RQ Index: %u DISABLED",
+				netdev_name(pf_netdev),
+				vnic_idx,
+				rq_idx);
+	}
+
+	return status;
+}