netdev - [PATCH net-next 2/4] r8169: simplify counter handling

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]

Date:   Fri, 1 May 2020 19:23:36 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next 2/4] r8169: simplify counter handling

The counter handling functions can only fail if rtl8169_do_counters()
times out. In the poll function we emit an error message in case of
timeout, therefore we don't have to propagate the timeout all the
way up just to print another message basically saying the same.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 38 ++++++++---------------
 1 file changed, 13 insertions(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index bfa199b36..1c2ea7506 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -1625,7 +1625,7 @@ DECLARE_RTL_COND(rtl_counters_cond)
 	return RTL_R32(tp, CounterAddrLow) & (CounterReset | CounterDump);
 }
 
-static bool rtl8169_do_counters(struct rtl8169_private *tp, u32 counter_cmd)
+static void rtl8169_do_counters(struct rtl8169_private *tp, u32 counter_cmd)
 {
 	dma_addr_t paddr = tp->counters_phys_addr;
 	u32 cmd;
@@ -1636,22 +1636,20 @@ static bool rtl8169_do_counters(struct rtl8169_private *tp, u32 counter_cmd)
 	RTL_W32(tp, CounterAddrLow, cmd);
 	RTL_W32(tp, CounterAddrLow, cmd | counter_cmd);
 
-	return rtl_udelay_loop_wait_low(tp, &rtl_counters_cond, 10, 1000);
+	rtl_udelay_loop_wait_low(tp, &rtl_counters_cond, 10, 1000);
 }
 
-static bool rtl8169_reset_counters(struct rtl8169_private *tp)
+static void rtl8169_reset_counters(struct rtl8169_private *tp)
 {
 	/*
 	 * Versions prior to RTL_GIGA_MAC_VER_19 don't support resetting the
 	 * tally counters.
 	 */
-	if (tp->mac_version < RTL_GIGA_MAC_VER_19)
-		return true;
-
-	return rtl8169_do_counters(tp, CounterReset);
+	if (tp->mac_version >= RTL_GIGA_MAC_VER_19)
+		rtl8169_do_counters(tp, CounterReset);
 }
 
-static bool rtl8169_update_counters(struct rtl8169_private *tp)
+static void rtl8169_update_counters(struct rtl8169_private *tp)
 {
 	u8 val = RTL_R8(tp, ChipCmd);
 
@@ -1659,16 +1657,13 @@ static bool rtl8169_update_counters(struct rtl8169_private *tp)
 	 * Some chips are unable to dump tally counters when the receiver
 	 * is disabled. If 0xff chip may be in a PCI power-save state.
 	 */
-	if (!(val & CmdRxEnb) || val == 0xff)
-		return true;
-
-	return rtl8169_do_counters(tp, CounterDump);
+	if (val & CmdRxEnb && val != 0xff)
+		rtl8169_do_counters(tp, CounterDump);
 }
 
-static bool rtl8169_init_counter_offsets(struct rtl8169_private *tp)
+static void rtl8169_init_counter_offsets(struct rtl8169_private *tp)
 {
 	struct rtl8169_counters *counters = tp->counters;
-	bool ret = false;
 
 	/*
 	 * rtl8169_init_counter_offsets is called from rtl_open.  On chip
@@ -1686,22 +1681,16 @@ static bool rtl8169_init_counter_offsets(struct rtl8169_private *tp)
 	 */
 
 	if (tp->tc_offset.inited)
-		return true;
-
-	/* If both, reset and update fail, propagate to caller. */
-	if (rtl8169_reset_counters(tp))
-		ret = true;
+		return;
 
-	if (rtl8169_update_counters(tp))
-		ret = true;
+	rtl8169_reset_counters(tp);
+	rtl8169_update_counters(tp);
 
 	tp->tc_offset.tx_errors = counters->tx_errors;
 	tp->tc_offset.tx_multi_collision = counters->tx_multi_collision;
 	tp->tc_offset.tx_aborted = counters->tx_aborted;
 	tp->tc_offset.rx_missed = counters->rx_missed;
 	tp->tc_offset.inited = true;
-
-	return ret;
 }
 
 static void rtl8169_get_ethtool_stats(struct net_device *dev,
@@ -4759,8 +4748,7 @@ static int rtl_open(struct net_device *dev)
 
 	rtl_hw_start(tp);
 
-	if (!rtl8169_init_counter_offsets(tp))
-		netif_warn(tp, hw, dev, "counter reset/update failed\n");
+	rtl8169_init_counter_offsets(tp);
 
 	phy_start(tp->phydev);
 	netif_start_queue(dev);
-- 
2.26.2