octeon_ep: fix VF MAC address lifecycle handling

[ Upstream commit a72175c ]

Currently, VF MAC address info is not updated when the MAC address is
configured from VF, and it is not cleared when the VF is removed. This
leads to stale or missing MAC information in the PF, which may cause
incorrect state tracking or inconsistencies when VFs are hot-plugged
or reassigned.

Fix this by:
 - storing the VF MAC address in the PF when it is set from VF
 - clearing the stored VF MAC address when the VF is removed

This ensures that the PF always has correct VF MAC state.

Fixes: cde29af ("octeon_ep: add PF-VF mailbox communication")
Signed-off-by: Sathesh B Edara <sedara@marvell.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250916133207.21737-1-sedara@marvell.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Sathesh B Edara

drivers/net/ethernet/marvell/octeon_ep/octep_pfvf_mbox.c

@@ -177,6 +177,7 @@ static void octep_pfvf_get_mac_addr(struct octep_device *oct,  u32 vf_id,
 		dev_err(&oct->pdev->dev, "Get VF MAC address failed via host control Mbox\n");
 		return;
 	}
+	ether_addr_copy(oct->vf_info[vf_id].mac_addr, rsp->s_set_mac.mac_addr);
 	rsp->s_set_mac.type = OCTEP_PFVF_MBOX_TYPE_RSP_ACK;
 }
 
@@ -186,6 +187,8 @@ static void octep_pfvf_dev_remove(struct octep_device *oct,  u32 vf_id,
 {
 	int err;
 
+	/* Reset VF-specific information maintained by the PF */
+	memset(&oct->vf_info[vf_id], 0, sizeof(struct octep_pfvf_info));
 	err = octep_ctrl_net_dev_remove(oct, vf_id);
 	if (err) {
 		rsp->s.type = OCTEP_PFVF_MBOX_TYPE_RSP_NACK;