[RFC PATCH v5 18/27] qedn: Add qedn_claim_dev API support

Shai Malin
2021-05-19T12:36:31Z

From: Nikolay Assa <nassa@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@marvell.com>
Signed-off-by: Nikolay Assa <nassa@marvell.com>
Signed-off-by: Prabhakar Kushwaha <pkushwaha@marvell.com>
Signed-off-by: Omkar Kulkarni <okulkarni@marvell.com>
Signed-off-by: Michal Kalderon <mkalderon@marvell.com>
Signed-off-by: Ariel Elior <aelior@marvell.com>
Signed-off-by: Shai Malin <smalin@marvell.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
drivers/nvme/hw/qedn/qedn.h | 4 ++++
drivers/nvme/hw/qedn/qedn_main.c | 41 ++++++++++++++++++++++++++++++--
2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/hw/qedn/qedn.h b/drivers/nvme/hw/qedn/qedn.h
index f13073afbced..f49ae2dcb8fe 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 46110b5a779b..c2e5263cfb46 100644
--- a/drivers/nvme/hw/qedn/qedn_main.c
+++ b/drivers/nvme/hw/qedn/qedn_main.c
@@ -26,9 +26,46 @@ 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;
+
+ 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_setup_ctrl(struct nvme_tcp_ofld_ctrl *ctrl, bool new)