[PATCH net] octeontx2-pf: check DMAC extraction support before filtering

[<nshettyj@marvell.com>]

From: Suman Ghosh <sumang@marvell.com>

Currently, configuring a VF MAC address via the PF (e.g., 'ip link
set <pf> vf 0 mac <mac>') blindly attempts to install a DMAC-based
hardware filter. However, the hardware parser profile might not
support DMAC extraction.

Check if the hardware parsing profile supports DMAC extraction
before adding the filter. Additionally, emit a warning message
to inform the operator if the MAC filter installation fails due
to missing DMAC extraction support.

Fixes: f0c2982aaf98 ("octeontx2-pf: Add support for SR-IOV management functions")
Signed-off-by: Suman Ghosh <sumang@marvell.com>
Signed-off-by: Nitin Shetty J <nshettyj@marvell.com>
---
 .../ethernet/marvell/octeontx2/nic/otx2_pf.c  | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
index b63df5737ff2..8e4435d9e520 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
@@ -2546,6 +2546,8 @@ static int otx2_do_set_vf_mac(struct otx2_nic *pf, int vf, const u8 *mac)
 static int otx2_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
 {
 	struct otx2_nic *pf = netdev_priv(netdev);
+	struct npc_get_field_status_req *req;
+	struct npc_get_field_status_rsp *rsp;
 	struct pci_dev *pdev = pf->pdev;
 	struct otx2_vf_config *config;
 	int ret;
@@ -2559,6 +2561,38 @@ static int otx2_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
 	if (!is_valid_ether_addr(mac))
 		return -EINVAL;
 
+	/* Skip installing the DMAC filter if the hardware parser profile
+	 * does not support DMAC extraction.
+	 */
+	mutex_lock(&pf->mbox.lock);
+	req = otx2_mbox_alloc_msg_npc_get_field_status(&pf->mbox);
+	if (!req) {
+		mutex_unlock(&pf->mbox.lock);
+		return -ENOMEM;
+	}
+
+	req->field = NPC_DMAC;
+	if (otx2_sync_mbox_msg(&pf->mbox)) {
+		mutex_unlock(&pf->mbox.lock);
+		return -EINVAL;
+	}
+
+	rsp = (struct npc_get_field_status_rsp *)otx2_mbox_get_rsp
+	       (&pf->mbox.mbox, 0, &req->hdr);
+	if (IS_ERR(rsp)) {
+		mutex_unlock(&pf->mbox.lock);
+		return PTR_ERR(rsp);
+	}
+
+	if (!rsp->enable) {
+		mutex_unlock(&pf->mbox.lock);
+		netdev_warn(netdev, "VF %d MAC filter not installed: DMAC extraction not supported by parser profile\n",
+			    vf);
+		return 0;
+	}
+
+	mutex_unlock(&pf->mbox.lock);
+
 	config = &pf->vf_configs[vf];
 	ether_addr_copy(config->mac, mac);
 
-- 
2.48.1