[RFC PATCH v6 18/27] qedn: Add qedn_claim_dev API support

[Shai Malin]

From: Nikolay Assa <nassa at marvell.com>

This patch introduces the qedn_claim_dev() network service which the
offload device (qedn) is using through the paired net-device (qede).
qedn_claim_dev() returns true if the IP addr(IPv4 or IPv6) of the target
server is reachable via the net-device which is paired with the
offloaded device.

Acked-by: Igor Russkikh <irusskikh at marvell.com>
Signed-off-by: Nikolay Assa <nassa at marvell.com>
Signed-off-by: Prabhakar Kushwaha <pkushwaha at marvell.com>
Signed-off-by: Omkar Kulkarni <okulkarni at marvell.com>
Signed-off-by: Michal Kalderon <mkalderon at marvell.com>
Signed-off-by: Ariel Elior <aelior at marvell.com>
Signed-off-by: Shai Malin <smalin at marvell.com>
Reviewed-by: Hannes Reinecke <hare at suse.de>
---
 drivers/nvme/hw/qedn/qedn.h      |  4 +++
 drivers/nvme/hw/qedn/qedn_main.c | 50 +++++++++++++++++++++++++++++---
 2 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/hw/qedn/qedn.h b/drivers/nvme/hw/qedn/qedn.h
index 931efc3afbaa..0ce1e19d1ba8 100644
--- a/drivers/nvme/hw/qedn/qedn.h
+++ b/drivers/nvme/hw/qedn/qedn.h
@@ -8,6 +8,10 @@
 
 #include <linux/qed/qed_if.h>
 #include <linux/qed/qed_nvmetcp_if.h>
+#include <linux/qed/qed_nvmetcp_ip_services_if.h>
+#include <linux/qed/qed_chain.h>
+#include <linux/qed/storage_common.h>
+#include <linux/qed/nvmetcp_common.h>
 
 /* Driver includes */
 #include "../../host/tcp-offload.h"
diff --git a/drivers/nvme/hw/qedn/qedn_main.c b/drivers/nvme/hw/qedn/qedn_main.c
index 1888c72805cb..2f02867c5c36 100644
--- a/drivers/nvme/hw/qedn/qedn_main.c
+++ b/drivers/nvme/hw/qedn/qedn_main.c
@@ -22,13 +22,56 @@ static struct pci_device_id qedn_pci_tbl[] = {
 	{0, 0},
 };
 
+static int
+qedn_find_dev(struct nvme_tcp_ofld_dev *dev,
+	      struct nvme_tcp_ofld_ctrl_con_params *conn_params,
+	      void *qctrl)
+{
+	struct pci_dev *qede_pdev = NULL;
+	struct sockaddr remote_mac_addr;
+	struct net_device *ndev = NULL;
+	u16 vlan_id = 0;
+	int rc = 0;
+
+	/* qedn utilizes host network stack through paired qede device for
+	 * non-offload traffic. First we verify there is valid route to remote
+	 * peer.
+	 */
+	if (conn_params->remote_ip_addr.ss_family == AF_INET) {
+		rc = qed_route_ipv4(&conn_params->local_ip_addr,
+				    &conn_params->remote_ip_addr,
+				    &remote_mac_addr, &ndev);
+	} else if (conn_params->remote_ip_addr.ss_family == AF_INET6) {
+		rc = qed_route_ipv6(&conn_params->local_ip_addr,
+				    &conn_params->remote_ip_addr,
+				    &remote_mac_addr, &ndev);
+	} else {
+		pr_err("address family %d not supported\n",
+		       conn_params->remote_ip_addr.ss_family);
+
+		return false;
+	}
+
+	if (rc)
+		return false;
+
+	qed_vlan_get_ndev(&ndev, &vlan_id);
+
+	dev->ndev = ndev;
+
+	/* route found through ndev - validate this is qede*/
+	qede_pdev = qed_validate_ndev(ndev);
+	if (!qede_pdev)
+		return false;
+
+	return true;
+}
+
 static int
 qedn_claim_dev(struct nvme_tcp_ofld_dev *dev,
 	       struct nvme_tcp_ofld_ctrl_con_params *conn_params)
 {
-	/* Placeholder - qedn_claim_dev */
-
-	return 0;
+	return qedn_find_dev(dev, conn_params, NULL);
 }
 
 static int qedn_setup_ctrl(struct nvme_tcp_ofld_ctrl *ctrl)
@@ -41,7 +84,6 @@ static int qedn_setup_ctrl(struct nvme_tcp_ofld_ctrl *ctrl)
 static int qedn_release_ctrl(struct nvme_tcp_ofld_ctrl *ctrl)
 {
 	/* Placeholder - qedn_release_ctrl */
-
 	return 0;
 }
 
-- 
2.22.0