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:	Mon, 09 Feb 2009 16:57:11 -0800
From:	Scott Feldman <scofeldm@...co.com>
To:	netdev@...r.kernel.org
Subject: [PATCH net-next 1/4] enic: bug fix: return notify intr credits

enic: bug fix: return notify intr credits

Return notify intr credits after notify intr from firmware.  This is especially important for legacy PCI intr mode, where not returning credits would cause PBA to remain asserted which would get us right back into the ISR.

Signed-off-by: Scott Feldman <scofeldm@...co.com>
---
 drivers/net/enic/enic.h      |    2 +-
 drivers/net/enic/enic_main.c |   17 +++++++++++------
 drivers/net/enic/vnic_intr.h |   14 ++++++++++++++
 3 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/drivers/net/enic/enic.h b/drivers/net/enic/enic.h
index a832cc5..86b8c15 100644
--- a/drivers/net/enic/enic.h
+++ b/drivers/net/enic/enic.h
@@ -33,7 +33,7 @@
 
 #define DRV_NAME		"enic"
 #define DRV_DESCRIPTION		"Cisco 10G Ethernet Driver"
-#define DRV_VERSION		"1.0.0.648"
+#define DRV_VERSION		"1.0.0.933"
 #define DRV_COPYRIGHT		"Copyright 2008 Cisco Systems, Inc"
 #define PFX			DRV_NAME ": "
 
diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index 7d60551..35fc9ea 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -400,10 +400,13 @@ static irqreturn_t enic_isr_legacy(int irq, void *data)
 		return IRQ_NONE;	/* not our interrupt */
 	}
 
-	if (ENIC_TEST_INTR(pba, ENIC_INTX_NOTIFY))
+	if (ENIC_TEST_INTR(pba, ENIC_INTX_NOTIFY)) {
+		vnic_intr_return_all_credits(&enic->intr[ENIC_INTX_NOTIFY]);
 		enic_notify_check(enic);
+	}
 
 	if (ENIC_TEST_INTR(pba, ENIC_INTX_ERR)) {
+		vnic_intr_return_all_credits(&enic->intr[ENIC_INTX_ERR]);
 		enic_log_q_error(enic);
 		/* schedule recovery from WQ/RQ error */
 		schedule_work(&enic->reset);
@@ -476,6 +479,8 @@ static irqreturn_t enic_isr_msix_err(int irq, void *data)
 {
 	struct enic *enic = data;
 
+	vnic_intr_return_all_credits(&enic->intr[ENIC_MSIX_ERR]);
+
 	enic_log_q_error(enic);
 
 	/* schedule recovery from WQ/RQ error */
@@ -488,8 +493,8 @@ static irqreturn_t enic_isr_msix_notify(int irq, void *data)
 {
 	struct enic *enic = data;
 
+	vnic_intr_return_all_credits(&enic->intr[ENIC_MSIX_NOTIFY]);
 	enic_notify_check(enic);
-	vnic_intr_unmask(&enic->intr[ENIC_MSIX_NOTIFY]);
 
 	return IRQ_HANDLED;
 }
@@ -616,7 +621,7 @@ static inline void enic_queue_wq_skb(struct enic *enic,
 			vlan_tag_insert, vlan_tag);
 }
 
-/* netif_tx_lock held, process context with BHs disabled */
+/* netif_tx_lock held, process context with BHs disabled, or BH */
 static int enic_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
 {
 	struct enic *enic = netdev_priv(netdev);
@@ -1069,7 +1074,7 @@ static int enic_poll(struct napi_struct *napi, int budget)
 			lro_flush_all(&enic->lro_mgr);
 
 		netif_rx_complete(napi);
-		vnic_intr_unmask(&enic->intr[ENIC_MSIX_RQ]);
+		vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
 	}
 
 	return rq_work_done;
@@ -1095,9 +1100,9 @@ static int enic_poll_msix(struct napi_struct *napi, int budget)
 
 		vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
 
-		/* Accumulate intr event credits for this polling
+		/* Return intr event credits for this polling
 		 * cycle.  An intr event is the completion of a
-		 * a WQ or RQ packet.
+		 * RQ packet.
 		 */
 
 		vnic_intr_return_credits(&enic->intr[ENIC_MSIX_RQ],
diff --git a/drivers/net/enic/vnic_intr.h b/drivers/net/enic/vnic_intr.h
index ce633a5..9a53604 100644
--- a/drivers/net/enic/vnic_intr.h
+++ b/drivers/net/enic/vnic_intr.h
@@ -76,6 +76,20 @@ static inline void vnic_intr_return_credits(struct vnic_intr *intr,
 	iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
 }
 
+static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
+{
+	return ioread32(&intr->ctrl->int_credits);
+}
+
+static inline void vnic_intr_return_all_credits(struct vnic_intr *intr)
+{
+	unsigned int credits = vnic_intr_credits(intr);
+	int unmask = 1;
+	int reset_timer = 1;
+
+	vnic_intr_return_credits(intr, credits, unmask, reset_timer);
+}
+
 static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
 {
 	/* read PBA without clearing */

--
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

Powered by blists - more mailing lists