liquidio: Add spoof checking on a VF MAC address

1. Provide the API to set/unset the spoof checking feature.
2. Add a function to periodically provide the count of found
   packets with spoof VF MAC address.
3. Prevent VF MAC address changing while the spoofchk of the VF is
   on unless the changing MAC address is issued from PF.

Signed-off-by: Weilin Chang <weilin.chang@cavium.com>
Signed-off-by: Felix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/liquidio/lio_core.c

@@ -1357,6 +1357,69 @@ octnet_nic_stats_callback(struct octeon_device *oct_dev,
 	}
 }
 
+int lio_fetch_vf_stats(struct lio *lio)
+{
+	struct octeon_device *oct_dev = lio->oct_dev;
+	struct octeon_soft_command *sc;
+	struct oct_nic_vf_stats_resp *resp;
+
+	int retval;
+
+	/* Alloc soft command */
+	sc = (struct octeon_soft_command *)
+		octeon_alloc_soft_command(oct_dev,
+					  0,
+					  sizeof(struct oct_nic_vf_stats_resp),
+					  0);
+
+	if (!sc) {
+		dev_err(&oct_dev->pci_dev->dev, "Soft command allocation failed\n");
+		retval = -ENOMEM;
+		goto lio_fetch_vf_stats_exit;
+	}
+
+	resp = (struct oct_nic_vf_stats_resp *)sc->virtrptr;
+	memset(resp, 0, sizeof(struct oct_nic_vf_stats_resp));
+
+	init_completion(&sc->complete);
+	sc->sc_status = OCTEON_REQUEST_PENDING;
+
+	sc->iq_no = lio->linfo.txpciq[0].s.q_no;
+
+	octeon_prepare_soft_command(oct_dev, sc, OPCODE_NIC,
+				    OPCODE_NIC_VF_PORT_STATS, 0, 0, 0);
+
+	retval = octeon_send_soft_command(oct_dev, sc);
+	if (retval == IQ_SEND_FAILED) {
+		octeon_free_soft_command(oct_dev, sc);
+		goto lio_fetch_vf_stats_exit;
+	}
+
+	retval =
+		wait_for_sc_completion_timeout(oct_dev, sc,
+					       (2 * LIO_SC_MAX_TMO_MS));
+	if (retval)  {
+		dev_err(&oct_dev->pci_dev->dev,
+			"sc OPCODE_NIC_VF_PORT_STATS command failed\n");
+		goto lio_fetch_vf_stats_exit;
+	}
+
+	if (sc->sc_status != OCTEON_REQUEST_TIMEOUT && !resp->status) {
+		octeon_swap_8B_data((u64 *)&resp->spoofmac_cnt,
+				    (sizeof(u64)) >> 3);
+
+		if (resp->spoofmac_cnt != 0) {
+			dev_warn(&oct_dev->pci_dev->dev,
+				 "%llu Spoofed packets detected\n",
+				 resp->spoofmac_cnt);
+		}
+	}
+	WRITE_ONCE(sc->caller_is_done, 1);
+
+lio_fetch_vf_stats_exit:
+	return retval;
+}
+
 void lio_fetch_stats(struct work_struct *work)
 {
 	struct cavium_wk *wk = (struct cavium_wk *)work;
@@ -1367,6 +1430,17 @@ void lio_fetch_stats(struct work_struct *work)
 	unsigned long time_in_jiffies;
 	int retval;
 
+	if (OCTEON_CN23XX_PF(oct_dev)) {
+		/* report spoofchk every 2 seconds */
+		if (!(oct_dev->vfstats_poll % LIO_VFSTATS_POLL) &&
+		    (oct_dev->fw_info.app_cap_flags & LIQUIDIO_SPOOFCHK_CAP) &&
+		    oct_dev->sriov_info.num_vfs_alloced) {
+			lio_fetch_vf_stats(lio);
+		}
+
+		oct_dev->vfstats_poll++;
+	}
+
 	/* Alloc soft command */
 	sc = (struct octeon_soft_command *)
 		octeon_alloc_soft_command(oct_dev,

drivers/net/ethernet/cavium/liquidio/lio_ethtool.c

@@ -1713,7 +1713,8 @@ static void lio_vf_get_ethtool_stats(struct net_device *netdev,
 	  */
 	data[i++] = lstats.rx_dropped;
 	/* sum of oct->instr_queue[iq_no]->stats.tx_dropped */
-	data[i++] = lstats.tx_dropped;
+	data[i++] = lstats.tx_dropped +
+		oct_dev->link_stats.fromhost.fw_err_drop;
 
 	data[i++] = oct_dev->link_stats.fromwire.fw_total_mcast;
 	data[i++] = oct_dev->link_stats.fromhost.fw_total_mcast_sent;

drivers/net/ethernet/cavium/liquidio/lio_main.c

@@ -2858,6 +2858,62 @@ static int liquidio_set_vf_mac(struct net_device *netdev, int vfidx, u8 *mac)
 	return retval;
 }
 
+static int liquidio_set_vf_spoofchk(struct net_device *netdev, int vfidx,
+				    bool enable)
+{
+	struct lio *lio = GET_LIO(netdev);
+	struct octeon_device *oct = lio->oct_dev;
+	struct octnic_ctrl_pkt nctrl;
+	int retval;
+
+	if (!(oct->fw_info.app_cap_flags & LIQUIDIO_SPOOFCHK_CAP)) {
+		netif_info(lio, drv, lio->netdev,
+			   "firmware does not support spoofchk\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (vfidx < 0 || vfidx >= oct->sriov_info.num_vfs_alloced) {
+		netif_info(lio, drv, lio->netdev, "Invalid vfidx %d\n", vfidx);
+		return -EINVAL;
+	}
+
+	if (enable) {
+		if (oct->sriov_info.vf_spoofchk[vfidx])
+			return 0;
+	} else {
+		/* Clear */
+		if (!oct->sriov_info.vf_spoofchk[vfidx])
+			return 0;
+	}
+
+	memset(&nctrl, 0, sizeof(struct octnic_ctrl_pkt));
+	nctrl.ncmd.s.cmdgroup = OCTNET_CMD_GROUP1;
+	nctrl.ncmd.s.cmd = OCTNET_CMD_SET_VF_SPOOFCHK;
+	nctrl.ncmd.s.param1 =
+		vfidx + 1; /* vfidx is 0 based,
+			    * but vf_num (param1) is 1 based
+			    */
+	nctrl.ncmd.s.param2 = enable;
+	nctrl.ncmd.s.more = 0;
+	nctrl.iq_no = lio->linfo.txpciq[0].s.q_no;
+	nctrl.cb_fn = 0;
+
+	retval = octnet_send_nic_ctrl_pkt(oct, &nctrl);
+
+	if (retval) {
+		netif_info(lio, drv, lio->netdev,
+			   "Failed to set VF %d spoofchk %s\n", vfidx,
+			enable ? "on" : "off");
+		return -1;
+	}
+
+	oct->sriov_info.vf_spoofchk[vfidx] = enable;
+	netif_info(lio, drv, lio->netdev, "VF %u spoofchk is %s\n", vfidx,
+		   enable ? "on" : "off");
+
+	return 0;
+}
+
 static int liquidio_set_vf_vlan(struct net_device *netdev, int vfidx,
 				u16 vlan, u8 qos, __be16 vlan_proto)
 {
@@ -2920,6 +2976,8 @@ static int liquidio_get_vf_config(struct net_device *netdev, int vfidx,
 	if (vfidx < 0 || vfidx >= oct->sriov_info.num_vfs_alloced)
 		return -EINVAL;
 
+	memset(ivi, 0, sizeof(struct ifla_vf_info));
+
 	ivi->vf = vfidx;
 	macaddr = 2 + (u8 *)&oct->sriov_info.vf_macaddr[vfidx];
 	ether_addr_copy(&ivi->mac[0], macaddr);
@@ -2931,6 +2989,10 @@ static int liquidio_get_vf_config(struct net_device *netdev, int vfidx,
 	else
 		ivi->trusted = false;
 	ivi->linkstate = oct->sriov_info.vf_linkstate[vfidx];
+	ivi->spoofchk = oct->sriov_info.vf_spoofchk[vfidx];
+	ivi->max_tx_rate = lio->linfo.link.s.speed;
+	ivi->min_tx_rate = 0;
+
 	return 0;
 }
 
@@ -3180,6 +3242,7 @@ static const struct net_device_ops lionetdevops = {
 	.ndo_set_vf_mac		= liquidio_set_vf_mac,
 	.ndo_set_vf_vlan	= liquidio_set_vf_vlan,
 	.ndo_get_vf_config	= liquidio_get_vf_config,
+	.ndo_set_vf_spoofchk	= liquidio_set_vf_spoofchk,
 	.ndo_set_vf_trust	= liquidio_set_vf_trust,
 	.ndo_set_vf_link_state  = liquidio_set_vf_link_state,
 	.ndo_get_vf_stats	= liquidio_get_vf_stats,

drivers/net/ethernet/cavium/liquidio/lio_vf_main.c

@@ -1135,6 +1135,12 @@ static int liquidio_set_mac(struct net_device *netdev, void *p)
 		return -ENOMEM;
 	}
 
+	if (nctrl.sc_status ==
+	    FIRMWARE_STATUS_CODE(OCTEON_REQUEST_NO_PERMISSION)) {
+		dev_err(&oct->pci_dev->dev, "MAC Address change failed: no permission\n");
+		return -EPERM;
+	}
+
 	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
 	ether_addr_copy(((u8 *)&lio->linfo.hw_addr) + 2, addr->sa_data);
 
@@ -2049,6 +2055,8 @@ static int setup_nic_devices(struct octeon_device *octeon_dev)
 		lio->linfo.link.u64 = resp->cfg_info.linfo.link.u64;
 		lio->linfo.macaddr_is_admin_asgnd =
 			resp->cfg_info.linfo.macaddr_is_admin_asgnd;
+		lio->linfo.macaddr_spoofchk =
+			resp->cfg_info.linfo.macaddr_spoofchk;
 
 		lio->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
 

drivers/net/ethernet/cavium/liquidio/liquidio_common.h

@@ -118,6 +118,10 @@ enum octeon_tag_type {
 /* App specific capabilities from firmware to pf driver */
 #define LIQUIDIO_TIME_SYNC_CAP 0x1
 #define LIQUIDIO_SWITCHDEV_CAP 0x2
+#define LIQUIDIO_SPOOFCHK_CAP  0x4
+
+/* error status return from firmware */
+#define OCTEON_REQUEST_NO_PERMISSION 0xc
 
 static inline u32 incr_index(u32 index, u32 count, u32 max)
 {
@@ -241,6 +245,10 @@ static inline void add_sg_size(struct octeon_sg_entry *sg_entry,
 
 #define   OCTNET_CMD_QUEUE_COUNT_CTL	0x1f
 
+#define   OCTNET_CMD_GROUP1             1
+#define   OCTNET_CMD_SET_VF_SPOOFCHK    0x1
+#define   OCTNET_GROUP1_LAST_CMD        OCTNET_CMD_SET_VF_SPOOFCHK
+
 #define   OCTNET_CMD_VXLAN_PORT_ADD    0x0
 #define   OCTNET_CMD_VXLAN_PORT_DEL    0x1
 #define   OCTNET_CMD_RXCSUM_ENABLE     0x0
@@ -255,6 +263,8 @@ static inline void add_sg_size(struct octeon_sg_entry *sg_entry,
 #define   SEAPI_CMD_SPEED_SET           0x2
 #define   SEAPI_CMD_SPEED_GET           0x3
 
+#define OPCODE_NIC_VF_PORT_STATS        0x22
+
 #define   LIO_CMD_WAIT_TM 100
 
 /* RX(packets coming from wire) Checksum verification flags */
@@ -303,7 +313,8 @@ union octnet_cmd {
 
 		u64 more:6; /* How many udd words follow the command */
 
-		u64 reserved:29;
+		u64 cmdgroup:8;
+		u64 reserved:21;
 
 		u64 param1:16;
 
@@ -315,7 +326,8 @@ union octnet_cmd {
 
 		u64 param1:16;
 
-		u64 reserved:29;
+		u64 reserved:21;
+		u64 cmdgroup:8;
 
 		u64 more:6;
 
@@ -759,13 +771,17 @@ struct oct_link_info {
 #ifdef __BIG_ENDIAN_BITFIELD
 	u64 gmxport:16;
 	u64 macaddr_is_admin_asgnd:1;
-	u64 rsvd:31;
+	u64 rsvd:13;
+	u64 macaddr_spoofchk:1;
+	u64 rsvd1:17;
 	u64 num_txpciq:8;
 	u64 num_rxpciq:8;
 #else
 	u64 num_rxpciq:8;
 	u64 num_txpciq:8;
-	u64 rsvd:31;
+	u64 rsvd1:17;
+	u64 macaddr_spoofchk:1;
+	u64 rsvd:13;
 	u64 macaddr_is_admin_asgnd:1;
 	u64 gmxport:16;
 #endif

drivers/net/ethernet/cavium/liquidio/octeon_device.h

@@ -397,6 +397,8 @@ struct octeon_sriov_info {
 
 	int	vf_linkstate[MAX_POSSIBLE_VFS];
 
+	bool    vf_spoofchk[MAX_POSSIBLE_VFS];
+
 	u64	vf_drv_loaded_mask;
 };
 
@@ -607,6 +609,9 @@ struct octeon_device {
 	u8  speed_boot;
 	u8  speed_setting;
 	u8  no_speed_setting;
+
+	u32    vfstats_poll;
+#define LIO_VFSTATS_POLL 10
 };
 
 #define  OCT_DRV_ONLINE 1

drivers/net/ethernet/cavium/liquidio/octeon_network.h

@@ -71,6 +71,12 @@ struct oct_nic_stats_resp {
 	u64     status;
 };
 
+struct oct_nic_vf_stats_resp {
+	u64     rh;
+	u64	spoofmac_cnt;
+	u64     status;
+};
+
 struct oct_nic_stats_ctrl {
 	struct completion complete;
 	struct net_device *netdev;

drivers/net/ethernet/cavium/liquidio/octeon_nic.c

@@ -172,13 +172,15 @@ octnet_send_nic_ctrl_pkt(struct octeon_device *oct,
 
 	spin_unlock_bh(&oct->cmd_resp_wqlock);
 
-	switch (nctrl->ncmd.s.cmd) {
-		/* caller holds lock, can not sleep */
-	case OCTNET_CMD_CHANGE_DEVFLAGS:
-	case OCTNET_CMD_SET_MULTI_LIST:
-	case OCTNET_CMD_SET_UC_LIST:
-		WRITE_ONCE(sc->caller_is_done, true);
-		return retval;
+	if (nctrl->ncmd.s.cmdgroup == 0) {
+		switch (nctrl->ncmd.s.cmd) {
+			/* caller holds lock, can not sleep */
+		case OCTNET_CMD_CHANGE_DEVFLAGS:
+		case OCTNET_CMD_SET_MULTI_LIST:
+		case OCTNET_CMD_SET_UC_LIST:
+			WRITE_ONCE(sc->caller_is_done, true);
+			return retval;
+		}
 	}
 
 	retval = wait_for_sc_completion_timeout(oct, sc, 0);