From: Brice Goglin Date: Mon, 10 Nov 2008 12:58:41 +0000 (+0100) Subject: myri10ge: fix stop/go ordering even more X-Git-Tag: v2.6.28-rc5~58^2~5^2~4 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=8c2f5fa51e1b22db53acf4f3918b6f590b4a35a1;p=linux-2.6-omap-h63xx.git myri10ge: fix stop/go ordering even more The doorbell writes may be seen out of order by the firmware if they are in WC memory since the tx spin(un)lock does not flush WC writes. Hence if the "stop" is written on a different CPU than the "go", it is possible that the stop will arrive after the go unless we add an explicit memory barrier (and mmiowb() is not enough). It fixes transmit hangs in multi tx queue mode. Signed-off-by: Brice Goglin Signed-off-by: Jeff Garzik --- diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c index a5f428bcc0e..b3786709730 100644 --- a/drivers/net/myri10ge/myri10ge.c +++ b/drivers/net/myri10ge/myri10ge.c @@ -75,7 +75,7 @@ #include "myri10ge_mcp.h" #include "myri10ge_mcp_gen_header.h" -#define MYRI10GE_VERSION_STR "1.4.3-1.375" +#define MYRI10GE_VERSION_STR "1.4.3-1.378" MODULE_DESCRIPTION("Myricom 10G driver (10GbE)"); MODULE_AUTHOR("Maintainer: help@myri.com"); @@ -1393,6 +1393,7 @@ myri10ge_tx_done(struct myri10ge_slice_state *ss, int mcp_index) if (tx->req == tx->done) { tx->queue_active = 0; put_be32(htonl(1), tx->send_stop); + mb(); mmiowb(); } __netif_tx_unlock(dev_queue); @@ -2865,6 +2866,7 @@ again: if ((mgp->dev->real_num_tx_queues > 1) && tx->queue_active == 0) { tx->queue_active = 1; put_be32(htonl(1), tx->send_go); + mb(); mmiowb(); } tx->pkt_start++;