net: Remove usage of net_device last_rx member

The network stack no longer uses the last_rx member of struct net_device
since the bonding driver switched to use its own private last_rx in
commit 9f242738376d ("bonding: use last_arp_rx in slave_last_rx()").

However, some drivers still (ab)use the field for their own purposes and
some driver just update it without actually using it.

Previously, there was an accompanying comment for the last_rx member
added in commit 4dc89133f49b ("net: add a comment on netdev->last_rx")
which asked drivers not to update is, unless really needed. However,
this commend was removed in commit f8ff080dacec ("bonding: remove
useless updating of slave->dev->last_rx"), so some drivers added later
on still did update last_rx.

Remove all usage of last_rx and switch three drivers (sky2, atp and
smc91c92_cs) which actually read and write it to use their own private
copy in netdev_priv.

Compile-tested with allyesconfig and allmodconfig on x86 and arm.

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jay Vosburgh <j.vosburgh@gmail.com>
Cc: Veaceslav Falico <vfalico@gmail.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Cc: Mirko Lindner <mlindner@marvell.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Acked-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/m68k/emu/nfeth.c

@@ -124,7 +124,6 @@ static inline void recv_packet(struct net_device *dev)
 
 	skb->protocol = eth_type_trans(skb, dev);
 	netif_rx(skb);
-	dev->last_rx = jiffies;
 	dev->stats.rx_packets++;
 	dev->stats.rx_bytes += pktlen;
 

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

@@ -2360,7 +2360,6 @@ liquidio_push_packet(u32 octeon_id __attribute__((unused)),
 		if (packet_was_received) {
 			droq->stats.rx_bytes_received += len;
 			droq->stats.rx_pkts_received++;
-			netdev->last_rx = jiffies;
 		} else {
 			droq->stats.rx_dropped++;
 			netif_info(lio, rx_err, lio->netdev,

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

@@ -1571,7 +1571,6 @@ liquidio_push_packet(u32 octeon_id __attribute__((unused)),
 		if (packet_was_received) {
 			droq->stats.rx_bytes_received += len;
 			droq->stats.rx_pkts_received++;
-			netdev->last_rx = jiffies;
 		} else {
 			droq->stats.rx_dropped++;
 			netif_info(lio, rx_err, lio->netdev,

drivers/net/ethernet/hisilicon/hns/hns_enet.c

@@ -797,7 +797,6 @@ static void hns_nic_rx_up_pro(struct hns_nic_ring_data *ring_data,
 
 	skb->protocol = eth_type_trans(skb, ndev);
 	(void)napi_gro_receive(&ring_data->napi, skb);
-	ndev->last_rx = jiffies;
 }
 
 static int hns_desc_unused(struct hnae_ring *ring)

drivers/net/ethernet/intel/e1000e/netdev.c

@@ -240,9 +240,9 @@ static void e1000e_dump(struct e1000_adapter *adapter)
 	/* Print netdevice Info */
 	if (netdev) {
 		dev_info(&adapter->pdev->dev, "Net device Info\n");
-		pr_info("Device Name     state            trans_start      last_rx\n");
-		pr_info("%-15s %016lX %016lX %016lX\n", netdev->name,
-			netdev->state, dev_trans_start(netdev), netdev->last_rx);
+		pr_info("Device Name     state            trans_start\n");
+		pr_info("%-15s %016lX %016lX\n", netdev->name,
+			netdev->state, dev_trans_start(netdev));
 	}
 
 	/* Print Registers */

drivers/net/ethernet/intel/igb/igb_main.c

@@ -383,9 +383,9 @@ static void igb_dump(struct igb_adapter *adapter)
 	/* Print netdevice Info */
 	if (netdev) {
 		dev_info(&adapter->pdev->dev, "Net device Info\n");
-		pr_info("Device Name     state            trans_start      last_rx\n");
-		pr_info("%-15s %016lX %016lX %016lX\n", netdev->name,
-			netdev->state, dev_trans_start(netdev), netdev->last_rx);
+		pr_info("Device Name     state            trans_start\n");
+		pr_info("%-15s %016lX %016lX\n", netdev->name,
+			netdev->state, dev_trans_start(netdev));
 	}
 
 	/* Print Registers */

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

@@ -611,12 +611,11 @@ static void ixgbe_dump(struct ixgbe_adapter *adapter)
 	if (netdev) {
 		dev_info(&adapter->pdev->dev, "Net device Info\n");
 		pr_info("Device Name     state            "
-			"trans_start      last_rx\n");
-		pr_info("%-15s %016lX %016lX %016lX\n",
+			"trans_start\n");
+		pr_info("%-15s %016lX %016lX\n",
 			netdev->name,
 			netdev->state,
-			dev_trans_start(netdev),
-			netdev->last_rx);
+			dev_trans_start(netdev));
 	}
 
 	/* Print Registers */

drivers/net/ethernet/marvell/sky2.c

@@ -2666,7 +2666,7 @@ static inline void sky2_rx_done(struct sky2_hw *hw, unsigned port,
 	sky2->rx_stats.bytes += bytes;
 	u64_stats_update_end(&sky2->rx_stats.syncp);
 
-	dev->last_rx = jiffies;
+	sky2->last_rx = jiffies;
 	sky2_rx_update(netdev_priv(dev), rxqaddr[port]);
 }
 
@@ -2953,7 +2953,7 @@ static int sky2_rx_hung(struct net_device *dev)
 	u8 fifo_lev = sky2_read8(hw, Q_ADDR(rxq, Q_RL));
 
 	/* If idle and MAC or PCI is stuck */
-	if (sky2->check.last == dev->last_rx &&
+	if (sky2->check.last == sky2->last_rx &&
 	    ((mac_rp == sky2->check.mac_rp &&
 	      mac_lev != 0 && mac_lev >= sky2->check.mac_lev) ||
 	     /* Check if the PCI RX hang */
@@ -2965,7 +2965,7 @@ static int sky2_rx_hung(struct net_device *dev)
 			      fifo_rp, sky2_read8(hw, Q_ADDR(rxq, Q_WP)));
 		return 1;
 	} else {
-		sky2->check.last = dev->last_rx;
+		sky2->check.last = sky2->last_rx;
 		sky2->check.mac_rp = mac_rp;
 		sky2->check.mac_lev = mac_lev;
 		sky2->check.fifo_rp = fifo_rp;

drivers/net/ethernet/marvell/sky2.h

@@ -2247,6 +2247,7 @@ struct sky2_port {
 	u16		     rx_data_size;
 	u16		     rx_nfrags;
 
+	unsigned long	     last_rx;
 	struct {
 		unsigned long last;
 		u32	mac_rp;

drivers/net/ethernet/qualcomm/emac/emac-mac.c

@@ -1213,7 +1213,6 @@ void emac_mac_rx_process(struct emac_adapter *adpt, struct emac_rx_queue *rx_q,
 		emac_receive_skb(rx_q, skb, (u16)RRD_CVALN_TAG(&rrd),
 				 (bool)RRD_CVTAG(&rrd));
 
-		netdev->last_rx = jiffies;
 		(*num_pkts)++;
 	} while (*num_pkts < max_pkts);
 

drivers/net/ethernet/realtek/atp.c

@@ -170,7 +170,7 @@ struct net_local {
     spinlock_t lock;
     struct net_device *next_module;
     struct timer_list timer;	/* Media selection timer. */
-    long last_rx_time;		/* Last Rx, in jiffies, to handle Rx hang. */
+    unsigned long last_rx_time;	/* Last Rx, in jiffies, to handle Rx hang. */
     int saved_tx_size;
     unsigned int tx_unit_busy:1;
     unsigned char re_tx,	/* Number of packet retransmissions. */
@@ -668,11 +668,11 @@ static irqreturn_t atp_interrupt(int irq, void *dev_instance)
 			}
 			num_tx_since_rx++;
 		} else if (num_tx_since_rx > 8 &&
-			   time_after(jiffies, dev->last_rx + HZ)) {
+			   time_after(jiffies, lp->last_rx_time + HZ)) {
 			if (net_debug > 2)
 				printk(KERN_DEBUG "%s: Missed packet? No Rx after %d Tx and "
 					   "%ld jiffies status %02x  CMR1 %02x.\n", dev->name,
-					   num_tx_since_rx, jiffies - dev->last_rx, status,
+					   num_tx_since_rx, jiffies - lp->last_rx_time, status,
 					   (read_nibble(ioaddr, CMR1) >> 3) & 15);
 			dev->stats.rx_missed_errors++;
 			hardware_init(dev);
@@ -789,7 +789,6 @@ static void net_rx(struct net_device *dev)
 		read_block(ioaddr, pkt_len, skb_put(skb,pkt_len), dev->if_port);
 		skb->protocol = eth_type_trans(skb, dev);
 		netif_rx(skb);
-		dev->last_rx = jiffies;
 		dev->stats.rx_packets++;
 		dev->stats.rx_bytes += pkt_len;
 	}

drivers/net/ethernet/smsc/smc91c92_cs.c

@@ -113,6 +113,7 @@ struct smc_private {
     struct mii_if_info		mii_if;
     int				duplex;
     int				rx_ovrn;
+    unsigned long		last_rx;
 };
 
 /* Special definitions for Megahertz multifunction cards */
@@ -1491,6 +1492,7 @@ static void smc_rx(struct net_device *dev)
     if (!(rx_status & RS_ERRORS)) {
 	/* do stuff to make a new packet */
 	struct sk_buff *skb;
+	struct smc_private *smc = netdev_priv(dev);
 	
 	/* Note: packet_length adds 5 or 6 extra bytes here! */
 	skb = netdev_alloc_skb(dev, packet_length+2);
@@ -1509,7 +1511,7 @@ static void smc_rx(struct net_device *dev)
 	skb->protocol = eth_type_trans(skb, dev);
 	
 	netif_rx(skb);
-	dev->last_rx = jiffies;
+	smc->last_rx = jiffies;
 	dev->stats.rx_packets++;
 	dev->stats.rx_bytes += packet_length;
 	if (rx_status & RS_MULTICAST)
@@ -1790,7 +1792,7 @@ static void media_check(u_long arg)
     }
 
     /* Ignore collisions unless we've had no rx's recently */
-    if (time_after(jiffies, dev->last_rx + HZ)) {
+    if (time_after(jiffies, smc->last_rx + HZ)) {
 	if (smc->tx_err || (smc->media_status & EPH_16COL))
 	    media |= EPH_16COL;
     }

drivers/net/irda/bfin_sir.c

@@ -22,7 +22,7 @@ static int max_rate = 57600;
 static int max_rate = 115200;
 #endif
 
-static void turnaround_delay(unsigned long last_jif, int mtt)
+static void turnaround_delay(int mtt)
 {
 	long ticks;
 
@@ -209,7 +209,6 @@ static void bfin_sir_rx_chars(struct net_device *dev)
 	UART_CLEAR_LSR(port);
 	ch = UART_GET_CHAR(port);
 	async_unwrap_char(dev, &self->stats, &self->rx_buff, ch);
-	dev->last_rx = jiffies;
 }
 
 static irqreturn_t bfin_sir_rx_int(int irq, void *dev_id)
@@ -510,7 +509,7 @@ static void bfin_sir_send_work(struct work_struct *work)
 	int tx_cnt = 10;
 
 	while (bfin_sir_is_receiving(dev) && --tx_cnt)
-		turnaround_delay(dev->last_rx, self->mtt);
+		turnaround_delay(self->mtt);
 
 	bfin_sir_stop_rx(port);
 

drivers/net/irda/sh_sir.c

@@ -547,7 +547,6 @@ static void sh_sir_rx(struct sh_sir_self *self)
 
 		async_unwrap_char(self->ndev, &self->ndev->stats,
 				  &self->rx_buff, (u8)data);
-		self->ndev->last_rx = jiffies;
 
 		if (EOFD & sh_sir_read(self, IRIF_SIR_FRM))
 			continue;

drivers/staging/ks7010/ks_hostif.c

@@ -461,7 +461,6 @@ void hostif_data_indication(struct ks_wlan_private *priv)
 			skb->protocol = eth_type_trans(skb, skb->dev);
 			priv->nstats.rx_packets++;
 			priv->nstats.rx_bytes += rx_ind_size;
-			skb->dev->last_rx = jiffies;
 			netif_rx(skb);
 		} else {
 			priv->nstats.rx_dropped++;
@@ -494,7 +493,6 @@ void hostif_data_indication(struct ks_wlan_private *priv)
 			skb->protocol = eth_type_trans(skb, skb->dev);
 			priv->nstats.rx_packets++;
 			priv->nstats.rx_bytes += rx_ind_size;
-			skb->dev->last_rx = jiffies;
 			netif_rx(skb);
 		} else {
 			priv->nstats.rx_dropped++;

drivers/staging/netlogic/xlr_net.c

@@ -155,7 +155,6 @@ static void xlr_net_fmn_handler(int bkt, int src_stnid, int size, int code,
 		skb_reserve(skb, BYTE_OFFSET);
 		skb_put(skb, length);
 		skb->protocol = eth_type_trans(skb, skb->dev);
-		skb->dev->last_rx = jiffies;
 		netif_rx(skb);
 		/* Fill rx ring */
 		skb_data = xlr_alloc_skb();

drivers/staging/rtl8192e/rtllib_rx.c

@@ -1375,7 +1375,6 @@ static int rtllib_rx_InfraAdhoc(struct rtllib_device *ieee, struct sk_buff *skb,
 		ieee->LinkDetectInfo.NumRecvDataInPeriod++;
 		ieee->LinkDetectInfo.NumRxOkInPeriod++;
 	}
-	dev->last_rx = jiffies;
 
 	/* Data frame - extract src/dst addresses */
 	rtllib_rx_extract_addr(ieee, hdr, dst, src, bssid);

drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c

@@ -1103,11 +1103,7 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
 		stats = hostap_get_stats(dev);
 		from_assoc_ap = 1;
 	}
-#endif
-
-	dev->last_rx = jiffies;
 
-#ifdef NOT_YET
 	if ((ieee->iw_mode == IW_MODE_MASTER ||
 	     ieee->iw_mode == IW_MODE_REPEAT) &&
 	    !from_assoc_ap) {

drivers/staging/wlan-ng/hfa384x_usb.c

@@ -3409,7 +3409,6 @@ static void hfa384x_usbin_rx(struct wlandevice *wlandev, struct sk_buff *skb)
 			&usbin->rxfrm.desc.frame_control, hdrlen);
 
 		skb->dev = wlandev->netdev;
-		skb->dev->last_rx = jiffies;
 
 		/* And set the frame length properly */
 		skb_trim(skb, data_len + hdrlen);

drivers/staging/wlan-ng/p80211netdev.c

@@ -252,7 +252,6 @@ static int p80211_convert_to_ether(struct wlandevice *wlandev,
 	}
 
 	if (skb_p80211_to_ether(wlandev, wlandev->ethconv, skb) == 0) {
-		skb->dev->last_rx = jiffies;
 		wlandev->netdev->stats.rx_packets++;
 		wlandev->netdev->stats.rx_bytes += skb->len;
 		netif_rx_ni(skb);
@@ -287,7 +286,6 @@ static void p80211netdev_rx_bh(unsigned long arg)
 				skb->ip_summed = CHECKSUM_NONE;
 				skb->pkt_type = PACKET_OTHERHOST;
 				skb->protocol = htons(ETH_P_80211_RAW);
-				dev->last_rx = jiffies;
 
 				dev->stats.rx_packets++;
 				dev->stats.rx_bytes += skb->len;

include/linux/netdevice.h

@@ -1551,7 +1551,6 @@ enum netdev_priv_flags {
  *	@ax25_ptr:	AX.25 specific data
  *	@ieee80211_ptr:	IEEE 802.11 specific data, assign before registering
  *
- *	@last_rx:	Time of last Rx
  *	@dev_addr:	Hw address (before bcast,
  *			because most packets are unicast)
  *
@@ -1777,8 +1776,6 @@ struct net_device {
 /*
  * Cache lines mostly used on receive path (including eth_type_trans())
  */
-	unsigned long		last_rx;
-
 	/* Interface address info used in eth_type_trans() */
 	unsigned char		*dev_addr;
 

net/batman-adv/bridge_loop_avoidance.c

@@ -449,7 +449,6 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac,
 	batadv_inc_counter(bat_priv, BATADV_CNT_RX);
 	batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 			   skb->len + ETH_HLEN);
-	soft_iface->last_rx = jiffies;
 
 	netif_rx(skb);
 out:

net/batman-adv/distributed-arp-table.c

@@ -1050,7 +1050,6 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
 						   bat_priv->soft_iface);
 		bat_priv->stats.rx_packets++;
 		bat_priv->stats.rx_bytes += skb->len + ETH_HLEN + hdr_size;
-		bat_priv->soft_iface->last_rx = jiffies;
 
 		netif_rx(skb_new);
 		batadv_dbg(BATADV_DBG_DAT, bat_priv, "ARP request replied locally\n");

net/batman-adv/soft-interface.c

@@ -481,8 +481,6 @@ void batadv_interface_rx(struct net_device *soft_iface,
 	batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
 			   skb->len + ETH_HLEN);
 
-	soft_iface->last_rx = jiffies;
-
 	/* Let the bridge loop avoidance check the packet. If will
 	 * not handle it, we can safely push it up.
 	 */