[PATCH net-next 12/14] bnxt_en: Forward VF MAC address to the PF.

[Michael Chan <michael.chan@broadcom.com>]

From: Vasundhara Volam <vasundhara-v.volam@broadcom.com>

Forward hwrm_func_vf_cfg command from VF to PF driver, to store
VF MAC address in PF's context.  This will allow "ip link show"
to display all VF MAC addresses.

Maintain 2 locations of MAC address in VF info structure, one for
a PF assigned MAC and one for VF assigned MAC.

Display VF assigned MAC in "ip link show", only if PF assigned MAC is
not valid.

Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c       |  3 +-
 drivers/net/ethernet/broadcom/bnxt/bnxt.h       |  5 ++-
 drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c | 50 ++++++++++++++++++++++---
 3 files changed, 51 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index e265219..ec8e623 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -213,6 +213,7 @@ enum board_idx {
 
 static const u16 bnxt_vf_req_snif[] = {
 	HWRM_FUNC_CFG,
+	HWRM_FUNC_VF_CFG,
 	HWRM_PORT_PHY_QCFG,
 	HWRM_CFA_L2_FILTER_ALLOC,
 };
@@ -8432,7 +8433,7 @@ static int bnxt_init_mac_addr(struct bnxt *bp)
 		struct bnxt_vf_info *vf = &bp->vf;
 
 		if (is_valid_ether_addr(vf->mac_addr)) {
-			/* overwrite netdev dev_adr with admin VF MAC */
+			/* overwrite netdev dev_addr with admin VF MAC */
 			memcpy(bp->dev->dev_addr, vf->mac_addr, ETH_ALEN);
 		} else {
 			eth_hw_addr_random(bp->dev);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 920c19b..0b30dcc 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -804,7 +804,10 @@ struct bnxt_hw_resc {
 #if defined(CONFIG_BNXT_SRIOV)
 struct bnxt_vf_info {
 	u16	fw_fid;
-	u8	mac_addr[ETH_ALEN];
+	u8	mac_addr[ETH_ALEN];	/* PF assigned MAC Address */
+	u8	vf_mac_addr[ETH_ALEN];	/* VF assigned MAC address, only
+					 * stored by PF.
+					 */
 	u16	vlan;
 	u32	flags;
 #define BNXT_VF_QOS		0x1
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
index 508e917..d87faad 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
@@ -135,7 +135,10 @@ int bnxt_get_vf_config(struct net_device *dev, int vf_id,
 	ivi->vf = vf_id;
 	vf = &bp->pf.vf[vf_id];
 
-	memcpy(&ivi->mac, vf->mac_addr, ETH_ALEN);
+	if (is_valid_ether_addr(vf->mac_addr))
+		memcpy(&ivi->mac, vf->mac_addr, ETH_ALEN);
+	else
+		memcpy(&ivi->mac, vf->vf_mac_addr, ETH_ALEN);
 	ivi->max_tx_rate = vf->max_tx_rate;
 	ivi->min_tx_rate = vf->min_tx_rate;
 	ivi->vlan = vf->vlan;
@@ -883,17 +886,51 @@ static int bnxt_hwrm_exec_fwd_resp(struct bnxt *bp, struct bnxt_vf_info *vf,
 	return rc;
 }
 
+static int bnxt_vf_store_mac(struct bnxt *bp, struct bnxt_vf_info *vf)
+{
+	u32 msg_size = sizeof(struct hwrm_func_vf_cfg_input);
+	struct hwrm_func_vf_cfg_input *req =
+		(struct hwrm_func_vf_cfg_input *)vf->hwrm_cmd_req_addr;
+
+	/* Only allow VF to set a valid MAC address if the PF assigned MAC
+	 * address is zero
+	 */
+	if (req->enables & cpu_to_le32(FUNC_VF_CFG_REQ_ENABLES_DFLT_MAC_ADDR)) {
+		if (is_valid_ether_addr(req->dflt_mac_addr) &&
+		    !is_valid_ether_addr(vf->mac_addr)) {
+			ether_addr_copy(vf->vf_mac_addr, req->dflt_mac_addr);
+			return bnxt_hwrm_exec_fwd_resp(bp, vf, msg_size);
+		}
+		return bnxt_hwrm_fwd_err_resp(bp, vf, msg_size);
+	}
+	return bnxt_hwrm_exec_fwd_resp(bp, vf, msg_size);
+}
+
 static int bnxt_vf_validate_set_mac(struct bnxt *bp, struct bnxt_vf_info *vf)
 {
 	u32 msg_size = sizeof(struct hwrm_cfa_l2_filter_alloc_input);
 	struct hwrm_cfa_l2_filter_alloc_input *req =
 		(struct hwrm_cfa_l2_filter_alloc_input *)vf->hwrm_cmd_req_addr;
+	bool mac_ok = false;
 
-	if (!is_valid_ether_addr(vf->mac_addr) ||
-	    ether_addr_equal((const u8 *)req->l2_addr, vf->mac_addr))
+	/* VF MAC address must first match PF MAC address, if it is valid.
+	 * Otherwise, it must match the VF MAC address if firmware spec >=
+	 * 1.2.2
+	 */
+	if (is_valid_ether_addr(vf->mac_addr)) {
+		if (ether_addr_equal((const u8 *)req->l2_addr, vf->mac_addr))
+			mac_ok = true;
+	} else if (is_valid_ether_addr(vf->vf_mac_addr)) {
+		if (ether_addr_equal((const u8 *)req->l2_addr, vf->vf_mac_addr))
+			mac_ok = true;
+	} else if (bp->hwrm_spec_code < 0x10202) {
+		mac_ok = true;
+	} else {
+		mac_ok = true;
+	}
+	if (mac_ok)
 		return bnxt_hwrm_exec_fwd_resp(bp, vf, msg_size);
-	else
-		return bnxt_hwrm_fwd_err_resp(bp, vf, msg_size);
+	return bnxt_hwrm_fwd_err_resp(bp, vf, msg_size);
 }
 
 static int bnxt_vf_set_link(struct bnxt *bp, struct bnxt_vf_info *vf)
@@ -955,6 +992,9 @@ static int bnxt_vf_req_validate_snd(struct bnxt *bp, struct bnxt_vf_info *vf)
 	u32 req_type = le16_to_cpu(encap_req->req_type);
 
 	switch (req_type) {
+	case HWRM_FUNC_VF_CFG:
+		rc = bnxt_vf_store_mac(bp, vf);
+		break;
 	case HWRM_CFA_L2_FILTER_ALLOC:
 		rc = bnxt_vf_validate_set_mac(bp, vf);
 		break;
-- 
1.8.3.1