Re: [RFC PATCH v4 18/27] qedn: Add qedn_claim_dev API support

From: Nikolay Assa <redacted>

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 <redacted>
Signed-off-by: Nikolay Assa <redacted>
Signed-off-by: Prabhakar Kushwaha <redacted>
Signed-off-by: Omkar Kulkarni <redacted>
Signed-off-by: Michal Kalderon <mkalderon@marvell.com>
Signed-off-by: Ariel Elior <redacted>
Signed-off-by: Shai Malin <redacted>
---
  drivers/nvme/hw/qedn/qedn.h      |  4 +++
  drivers/nvme/hw/qedn/qedn_main.c | 42 ++++++++++++++++++++++++++++++--
  2 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/hw/qedn/qedn.h b/drivers/nvme/hw/qedn/qedn.h
index c1ac17eabcb7..7efe2366eb7c 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 e3e8e3676b79..52007d35622d 100644
--- a/drivers/nvme/hw/qedn/qedn_main.c
+++ b/drivers/nvme/hw/qedn/qedn_main.c

@@ -27,9 +27,47 @@ static int
  qedn_claim_dev(struct nvme_tcp_ofld_dev *dev,
  	       struct nvme_tcp_ofld_ctrl_con_params *conn_params)
  {
-	/* Placeholder - qedn_claim_dev */
+	struct pci_dev *qede_pdev = NULL;
+	struct net_device *ndev = NULL;
+	u16 vlan_id = 0;
+	int rc = 0;
  
-	return 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,
+				    &conn_params->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,
+				    &conn_params->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);
+	conn_params->vlan_id = vlan_id;
+
+	/* route found through ndev - validate this is qede*/
+	qede_pdev = qed_validate_ndev(ndev);
+	if (!qede_pdev)
+		return false;
+
+	dev->qede_pdev = qede_pdev;
+	dev->ndev = ndev;
+
+	return true;
  }
  
  static int qedn_create_queue(struct nvme_tcp_ofld_queue *queue, int qid,