| 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
| ||
|
Message-Id: <1231536713-24538-1-git-send-email-ron.mercer@qlogic.com>
Date: Fri, 9 Jan 2009 13:31:49 -0800
From: Ron Mercer <ron.mercer@...gic.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, linux-driver@...gic.com,
ron.mercer@...gic.com
Subject: [PATCH 1/5] qlge: Get rid of volatile usage for shadow register.
Putting back ql_read_sh_reg() function and using rmb() instead of
volatile.
Signed-off-by: Ron Mercer <ron.mercer@...gic.com>
---
drivers/net/qlge/qlge.h | 22 ++++++++++++++++++++--
drivers/net/qlge/qlge_dbg.c | 14 ++++++++------
drivers/net/qlge/qlge_main.c | 12 ++++++------
3 files changed, 34 insertions(+), 14 deletions(-)
diff --git a/drivers/net/qlge/qlge.h b/drivers/net/qlge/qlge.h
index 459663a..4cb3647 100644
--- a/drivers/net/qlge/qlge.h
+++ b/drivers/net/qlge/qlge.h
@@ -1145,7 +1145,7 @@ struct tx_ring {
struct wqicb wqicb; /* structure used to inform chip of new queue */
void *wq_base; /* pci_alloc:virtual addr for tx */
dma_addr_t wq_base_dma; /* pci_alloc:dma addr for tx */
- u32 *cnsmr_idx_sh_reg; /* shadow copy of consumer idx */
+ __le32 *cnsmr_idx_sh_reg; /* shadow copy of consumer idx */
dma_addr_t cnsmr_idx_sh_reg_dma; /* dma-shadow copy of consumer */
u32 wq_size; /* size in bytes of queue area */
u32 wq_len; /* number of entries in queue */
@@ -1181,7 +1181,7 @@ struct rx_ring {
u32 cq_size;
u32 cq_len;
u16 cq_id;
- volatile __le32 *prod_idx_sh_reg; /* Shadowed producer register. */
+ __le32 *prod_idx_sh_reg; /* Shadowed producer register. */
dma_addr_t prod_idx_sh_reg_dma;
void __iomem *cnsmr_idx_db_reg; /* PCI doorbell mem area + 0 */
u32 cnsmr_idx; /* current sw idx */
@@ -1459,6 +1459,24 @@ static inline void ql_write_db_reg(u32 val, void __iomem *addr)
mmiowb();
}
+/*
+ * Shadow Registers:
+ * Outbound queues have a consumer index that is maintained by the chip.
+ * Inbound queues have a producer index that is maintained by the chip.
+ * For lower overhead, these registers are "shadowed" to host memory
+ * which allows the device driver to track the queue progress without
+ * PCI reads. When an entry is placed on an inbound queue, the chip will
+ * update the relevant index register and then copy the value to the
+ * shadow register in host memory.
+ */
+static inline u32 ql_read_sh_reg(__le32 *addr)
+{
+ u32 reg;
+ reg = le32_to_cpu(*addr);
+ rmb();
+ return reg;
+}
+
extern char qlge_driver_name[];
extern const char qlge_driver_version[];
extern const struct ethtool_ops qlge_ethtool_ops;
diff --git a/drivers/net/qlge/qlge_dbg.c b/drivers/net/qlge/qlge_dbg.c
index 3f5e02d..e705ea5 100644
--- a/drivers/net/qlge/qlge_dbg.c
+++ b/drivers/net/qlge/qlge_dbg.c
@@ -455,10 +455,11 @@ void ql_dump_tx_ring(struct tx_ring *tx_ring)
printk(KERN_ERR PFX "tx_ring->base = %p.\n", tx_ring->wq_base);
printk(KERN_ERR PFX "tx_ring->base_dma = 0x%llx.\n",
(unsigned long long) tx_ring->wq_base_dma);
- printk(KERN_ERR PFX "tx_ring->cnsmr_idx_sh_reg = %p.\n",
- tx_ring->cnsmr_idx_sh_reg);
- printk(KERN_ERR PFX "tx_ring->cnsmr_idx_sh_reg_dma = 0x%llx.\n",
- (unsigned long long) tx_ring->cnsmr_idx_sh_reg_dma);
+ printk(KERN_ERR PFX
+ "tx_ring->cnsmr_idx_sh_reg, addr = 0x%p, value = %d.\n",
+ tx_ring->cnsmr_idx_sh_reg,
+ tx_ring->cnsmr_idx_sh_reg
+ ? ql_read_sh_reg(tx_ring->cnsmr_idx_sh_reg) : 0);
printk(KERN_ERR PFX "tx_ring->size = %d.\n", tx_ring->wq_size);
printk(KERN_ERR PFX "tx_ring->len = %d.\n", tx_ring->wq_len);
printk(KERN_ERR PFX "tx_ring->prod_idx_db_reg = %p.\n",
@@ -558,9 +559,10 @@ void ql_dump_rx_ring(struct rx_ring *rx_ring)
printk(KERN_ERR PFX "rx_ring->cq_size = %d.\n", rx_ring->cq_size);
printk(KERN_ERR PFX "rx_ring->cq_len = %d.\n", rx_ring->cq_len);
printk(KERN_ERR PFX
- "rx_ring->prod_idx_sh_reg, addr = %p, value = %d.\n",
+ "rx_ring->prod_idx_sh_reg, addr = 0x%p, value = %d.\n",
rx_ring->prod_idx_sh_reg,
- rx_ring->prod_idx_sh_reg ? *(rx_ring->prod_idx_sh_reg) : 0);
+ rx_ring->prod_idx_sh_reg
+ ? ql_read_sh_reg(rx_ring->prod_idx_sh_reg) : 0);
printk(KERN_ERR PFX "rx_ring->prod_idx_sh_reg_dma = %llx.\n",
(unsigned long long) rx_ring->prod_idx_sh_reg_dma);
printk(KERN_ERR PFX "rx_ring->cnsmr_idx_db_reg = %p.\n",
diff --git a/drivers/net/qlge/qlge_main.c b/drivers/net/qlge/qlge_main.c
index f4c0160..983c953 100644
--- a/drivers/net/qlge/qlge_main.c
+++ b/drivers/net/qlge/qlge_main.c
@@ -1545,7 +1545,7 @@ static void ql_process_chip_ae_intr(struct ql_adapter *qdev,
static int ql_clean_outbound_rx_ring(struct rx_ring *rx_ring)
{
struct ql_adapter *qdev = rx_ring->qdev;
- u32 prod = le32_to_cpu(*rx_ring->prod_idx_sh_reg);
+ u32 prod = ql_read_sh_reg(rx_ring->prod_idx_sh_reg);
struct ob_mac_iocb_rsp *net_rsp = NULL;
int count = 0;
@@ -1571,7 +1571,7 @@ static int ql_clean_outbound_rx_ring(struct rx_ring *rx_ring)
}
count++;
ql_update_cq(rx_ring);
- prod = le32_to_cpu(*rx_ring->prod_idx_sh_reg);
+ prod = ql_read_sh_reg(rx_ring->prod_idx_sh_reg);
}
ql_write_cq_idx(rx_ring);
if (netif_queue_stopped(qdev->ndev) && net_rsp != NULL) {
@@ -1591,7 +1591,7 @@ static int ql_clean_outbound_rx_ring(struct rx_ring *rx_ring)
static int ql_clean_inbound_rx_ring(struct rx_ring *rx_ring, int budget)
{
struct ql_adapter *qdev = rx_ring->qdev;
- u32 prod = le32_to_cpu(*rx_ring->prod_idx_sh_reg);
+ u32 prod = ql_read_sh_reg(rx_ring->prod_idx_sh_reg);
struct ql_net_rsp_iocb *net_rsp;
int count = 0;
@@ -1624,7 +1624,7 @@ static int ql_clean_inbound_rx_ring(struct rx_ring *rx_ring, int budget)
}
count++;
ql_update_cq(rx_ring);
- prod = le32_to_cpu(*rx_ring->prod_idx_sh_reg);
+ prod = ql_read_sh_reg(rx_ring->prod_idx_sh_reg);
if (count == budget)
break;
}
@@ -1787,7 +1787,7 @@ static irqreturn_t qlge_isr(int irq, void *dev_id)
* Check the default queue and wake handler if active.
*/
rx_ring = &qdev->rx_ring[0];
- if (le32_to_cpu(*rx_ring->prod_idx_sh_reg) != rx_ring->cnsmr_idx) {
+ if (ql_read_sh_reg(rx_ring->prod_idx_sh_reg) != rx_ring->cnsmr_idx) {
QPRINTK(qdev, INTR, INFO, "Waking handler for rx_ring[0].\n");
ql_disable_completion_interrupt(qdev, intr_context->intr);
queue_delayed_work_on(smp_processor_id(), qdev->q_workqueue,
@@ -1801,7 +1801,7 @@ static irqreturn_t qlge_isr(int irq, void *dev_id)
*/
for (i = 1; i < qdev->rx_ring_count; i++) {
rx_ring = &qdev->rx_ring[i];
- if (le32_to_cpu(*rx_ring->prod_idx_sh_reg) !=
+ if (ql_read_sh_reg(rx_ring->prod_idx_sh_reg) !=
rx_ring->cnsmr_idx) {
QPRINTK(qdev, INTR, INFO,
"Waking handler for rx_ring[%d].\n", i);
--
1.6.0
--
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