net: added support for 40GbE link.

1. removed code replication for tov calculation for 1G, 10G and
made is common for speed > 1G (1G, 10G, 40G, 100G).
2. defines values for #4 different 40G Phys (KR4, LF4, SR4, CR4)

Signed-off-by: Parav Pandit <[email protected]>
Reviewed-by: Ben Hutchings <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: [email protected]

include/linux/ethtool.h

@@ -1153,6 +1153,10 @@ struct ethtool_ops {
 #define SUPPORTED_10000baseR_FEC	(1 << 20)
 #define SUPPORTED_20000baseMLD2_Full	(1 << 21)
 #define SUPPORTED_20000baseKR2_Full	(1 << 22)
+#define SUPPORTED_40000baseKR4_Full	(1 << 23)
+#define SUPPORTED_40000baseCR4_Full	(1 << 24)
+#define SUPPORTED_40000baseSR4_Full	(1 << 25)
+#define SUPPORTED_40000baseLR4_Full	(1 << 26)
 
 /* Indicates what features are advertised by the interface. */
 #define ADVERTISED_10baseT_Half		(1 << 0)
@@ -1178,6 +1182,10 @@ struct ethtool_ops {
 #define ADVERTISED_10000baseR_FEC	(1 << 20)
 #define ADVERTISED_20000baseMLD2_Full	(1 << 21)
 #define ADVERTISED_20000baseKR2_Full	(1 << 22)
+#define ADVERTISED_40000baseKR4_Full	(1 << 23)
+#define ADVERTISED_40000baseCR4_Full	(1 << 24)
+#define ADVERTISED_40000baseSR4_Full	(1 << 25)
+#define ADVERTISED_40000baseLR4_Full	(1 << 26)
 
 /* The following are all involved in forcing a particular link
  * mode for the device for setting things.  When getting the

net/packet/af_packet.c

@@ -531,6 +531,7 @@ static int prb_calc_retire_blk_tmo(struct packet_sock *po,
 	unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
 	struct ethtool_cmd ecmd;
 	int err;
+	u32 speed;
 
 	rtnl_lock();
 	dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
@@ -539,25 +540,18 @@ static int prb_calc_retire_blk_tmo(struct packet_sock *po,
 		return DEFAULT_PRB_RETIRE_TOV;
 	}
 	err = __ethtool_get_settings(dev, &ecmd);
+	speed = ethtool_cmd_speed(&ecmd);
 	rtnl_unlock();
 	if (!err) {
-		switch (ecmd.speed) {
-		case SPEED_10000:
-			msec = 1;
-			div = 10000/1000;
-			break;
-		case SPEED_1000:
-			msec = 1;
-			div = 1000/1000;
-			break;
 		/*
 		 * If the link speed is so slow you don't really
 		 * need to worry about perf anyways
 		 */
-		case SPEED_100:
-		case SPEED_10:
-		default:
+		if (speed < SPEED_1000 || speed == SPEED_UNKNOWN) {
 			return DEFAULT_PRB_RETIRE_TOV;
+		} else {
+			msec = 1;
+			div = speed / 1000;
 		}
 	}