netdev - [PATCH] [5/6] pasemi_mac: don't enable rx before there are buffers on the ring

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20070926212442.GF24168@lixom.net>
Date:	Wed, 26 Sep 2007 16:24:42 -0500
From:	Olof Johansson <olof@...om.net>
To:	jgarzik@...ox.com
Cc:	netdev@...r.kernel.org
Subject: [PATCH] [5/6] pasemi_mac: don't enable rx before there are buffers
	on the ring

pasemi_mac: don't enable rx before there are buffers on the ring

Reorder initialization of the DMA channels and the interface. Before there
was a time window when the interface was enabled before DMA was enabled.
Also, now there will always be RX buffers available at the time the
MAC interface is enabled, to avoid temporary out-of-buffer errors for the
very first packets (on busy networks).


Signed-off-by: Olof Johansson <olof@...om.net>


Index: 2.6.23/drivers/net/pasemi_mac.c
===================================================================
--- 2.6.23.orig/drivers/net/pasemi_mac.c
+++ 2.6.23/drivers/net/pasemi_mac.c
@@ -791,14 +791,6 @@ static int pasemi_mac_open(struct net_de
 
 	write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);
 
-	flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
-		PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
-
-	if (mac->type == MAC_TYPE_GMAC)
-		flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
-	else
-		flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
-
 	write_iob_reg(mac, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
 			   PAS_IOB_DMA_RXCH_CFG_CNTTH(0));
 
@@ -813,8 +805,6 @@ static int pasemi_mac_open(struct net_de
 	write_iob_reg(mac, PAS_IOB_DMA_COM_TIMEOUTCFG,
 			   PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));
 
-	write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
-
 	ret = pasemi_mac_setup_rx_resources(dev);
 	if (ret)
 		goto out_rx_resources;
@@ -842,6 +832,17 @@ static int pasemi_mac_open(struct net_de
 
 	pasemi_mac_replenish_rx_ring(dev);
 
+	flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
+		PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
+
+	if (mac->type == MAC_TYPE_GMAC)
+		flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
+	else
+		flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
+
+	/* Enable interface in MAC */
+	write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
+
 	ret = pasemi_mac_phy_init(dev);
 	/* Some configs don't have PHYs (XAUI etc), so don't complain about
 	 * failed init due to -ENODEV.
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html