| 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
| ||
|
Date: Sat, 06 Feb 2010 10:22:59 +0900
From: Mike McCormack <mikem@...g3k.org>
To: Stephen Hemminger <shemminger@...tta.com>
CC: netdev@...r.kernel.org
Subject: [PATCH 2/2] sky2: Allocate initial skbs in sky2_alloc_buffers
Allocating everything in one place means there's a single point
of failure in sky2_up, and sky2_rx_start can no longer fail.
With this patch, sky2_restart can later be rewritten to shutdown
the hardware and restart it without freeing and reallocing memory.
Signed-off-by: Mike McCormack <mikem@...g3k.org>
---
drivers/net/sky2.c | 68 +++++++++++++++++++++++++++++-----------------------
1 files changed, 38 insertions(+), 30 deletions(-)
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 40c661b..ee091d1 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1379,8 +1379,34 @@ static inline void sky2_rx_update(struct sky2_port *sky2, unsigned rxq)
sky2_put_idx(sky2->hw, rxq, sky2->rx_put);
}
+static int sky2_alloc_rx_skbs(struct sky2_port *sky2)
+{
+ struct sky2_hw *hw = sky2->hw;
+ unsigned i;
+
+ sky2->rx_data_size = sky2_get_rx_data_size(sky2);
+
+ /* Fill Rx ring */
+ for (i = 0; i < sky2->rx_pending; i++) {
+ struct rx_ring_info *re = sky2->rx_ring + i;
+
+ re->skb = sky2_rx_alloc(sky2);
+ if (!re->skb)
+ goto nomem;
+
+ if (sky2_rx_map_skb(hw->pdev, re, sky2->rx_data_size)) {
+ dev_kfree_skb(re->skb);
+ re->skb = NULL;
+ goto nomem;
+ }
+ }
+ return 0;
+nomem:
+ return -ENOMEM;
+}
+
/*
- * Allocate and setup receiver buffer pool.
+ * Setup receiver buffer pool.
* Normal case this ends up creating one list element for skb
* in the receive ring. Worst case if using large MTU and each
* allocation falls on a different 64 bit region, that results
@@ -1388,7 +1414,7 @@ static inline void sky2_rx_update(struct sky2_port *sky2, unsigned rxq)
* One element is used for checksum enable/disable, and one
* extra to avoid wrap.
*/
-static int sky2_rx_start(struct sky2_port *sky2)
+static void sky2_rx_start(struct sky2_port *sky2)
{
struct sky2_hw *hw = sky2->hw;
struct rx_ring_info *re;
@@ -1414,22 +1440,9 @@ static int sky2_rx_start(struct sky2_port *sky2)
if (!(hw->flags & SKY2_HW_NEW_LE))
rx_set_checksum(sky2);
- sky2->rx_data_size = sky2_get_rx_data_size(sky2);
-
- /* Fill Rx ring */
+ /* submit Rx ring */
for (i = 0; i < sky2->rx_pending; i++) {
re = sky2->rx_ring + i;
-
- re->skb = sky2_rx_alloc(sky2);
- if (!re->skb)
- goto nomem;
-
- if (sky2_rx_map_skb(hw->pdev, re, sky2->rx_data_size)) {
- dev_kfree_skb(re->skb);
- re->skb = NULL;
- goto nomem;
- }
-
sky2_rx_submit(sky2, re);
}
@@ -1471,13 +1484,6 @@ static int sky2_rx_start(struct sky2_port *sky2)
sky2_write32(hw, Q_ADDR(txqaddr[sky2->port], Q_TEST),
TBMU_TEST_HOME_ADD_FIX_EN | TBMU_TEST_ROUTING_ADD_FIX_EN);
}
-
-
-
- return 0;
-nomem:
- sky2_rx_clean(sky2);
- return -ENOMEM;
}
static int sky2_alloc_buffers(struct sky2_port *sky2)
@@ -1508,7 +1514,7 @@ static int sky2_alloc_buffers(struct sky2_port *sky2)
if (!sky2->rx_ring)
goto nomem;
- return 0;
+ return sky2_alloc_rx_skbs(sky2);
nomem:
return -ENOMEM;
}
@@ -1517,6 +1523,8 @@ static void sky2_free_buffers(struct sky2_port *sky2)
{
struct sky2_hw *hw = sky2->hw;
+ sky2_rx_clean(sky2);
+
if (sky2->rx_le) {
pci_free_consistent(hw->pdev, RX_LE_BYTES,
sky2->rx_le, sky2->rx_le_map);
@@ -1606,9 +1614,7 @@ static int sky2_up(struct net_device *dev)
sky2_set_vlan_mode(hw, port, sky2->vlgrp != NULL);
#endif
- err = sky2_rx_start(sky2);
- if (err)
- goto err_out;
+ sky2_rx_start(sky2);
/* Enable interrupts from phy/mac for port */
imask = sky2_read32(hw, B0_IMSK);
@@ -1976,8 +1982,6 @@ static int sky2_down(struct net_device *dev)
/* Free any pending frames stuck in HW queue */
sky2_tx_complete(sky2, sky2->tx_prod);
- sky2_rx_clean(sky2);
-
sky2_free_buffers(sky2);
return 0;
@@ -2267,7 +2271,11 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu)
sky2_write8(hw, RB_ADDR(rxqaddr[port], RB_CTRL), RB_ENA_OP_MD);
- err = sky2_rx_start(sky2);
+ err = sky2_alloc_rx_skbs(sky2);
+ if (!err)
+ sky2_rx_start(sky2);
+ else
+ sky2_rx_clean(sky2);
sky2_write32(hw, B0_IMSK, imask);
sky2_read32(hw, B0_Y2_SP_LISR);
--
1.5.6.5
--
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