Messages in this thread Patch in this message | | | Date | Tue, 20 Apr 2004 16:04:26 -0700 (PDT) | From | Scott Feldman <> | Subject | Re: e100 NETDEV WATCHDOG transmit timeout since 2.6.4 |
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On Tue, 20 Apr 2004, Mike Keehan wrote:
> I am getting these too in recent kernels, but only on a > 10Mhz half-duplex network. I have to manually down > and up the interface to recover. > > On a 100Mhz switched network, the e100 is OK (at least 12hours+).
Mike/Eamonn,
Give this patch a try. This adds a required workaround for ICH when working at 10/Half. (Guessing you have an ICH system).
--- linux-2.5/drivers/net/e100.c 2004-04-20 15:52:24.000000000 -0700 +++ linux-2.5/drivers/net/e100.c.mod 2004-04-20 15:55:32.000000000 -0700 @@ -287,6 +287,7 @@ enum scb_cmd_hi { };
enum scb_cmd_lo { + cuc_nop = 0x00, ruc_start = 0x01, ruc_load_base = 0x06, cuc_start = 0x10, @@ -514,10 +515,11 @@ struct nic { /* End: frequently used values: keep adjacent for cache effect */
enum { - ich = (1 << 0), - promiscuous = (1 << 1), - multicast_all = (1 << 2), - wol_magic = (1 << 3), + ich = (1 << 0), + promiscuous = (1 << 1), + multicast_all = (1 << 2), + wol_magic = (1 << 3), + ich_10h_workaround = (1 << 4), } flags ____cacheline_aligned;
enum mac mac; @@ -1225,6 +1227,12 @@ static void e100_watchdog(unsigned long /* Issue a multicast command to workaround a 557 lock up */ e100_set_multicast_list(nic->netdev);
+ if(nic->flags & ich && cmd.speed==SPEED_10 && cmd.duplex==DUPLEX_HALF) + /* Need SW workaround for ICH[x] 10Mbps/half duplex Tx hang. */ + nic->flags |= ich_10h_workaround; + else + nic->flags &= ~ich_10h_workaround; + mod_timer(&nic->watchdog, jiffies + E100_WATCHDOG_PERIOD); }
@@ -1244,7 +1252,17 @@ static inline void e100_xmit_prepare(str static int e100_xmit_frame(struct sk_buff *skb, struct net_device *netdev) { struct nic *nic = netdev->priv; - int err = e100_exec_cb(nic, skb, e100_xmit_prepare); + int err; + + if(nic->flags & ich_10h_workaround) { + /* SW workaround for ICH[x] 10Mbps/half duplex Tx hang. + Issue a NOP command followed by a 1us delay before + issuing the Tx command. */ + e100_exec_cmd(nic, cuc_nop, 0); + udelay(1); + } + + err = e100_exec_cb(nic, skb, e100_xmit_prepare);
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