These changes correct the following issues with jumbo frames on the
stmmac driver:
1) The Synopsys EMAC can be configured to support different FIFO
sizes at core configuration time. There's no way to query the
controller and know the FIFO size, so the driver needs to get this
information from the device tree in order to know how to correctly
handle MTU changes and setting up dma buffers. A change was submitted
for the device tree seperately to add a maxmtu property for the
Synopsys EMAC configuration.
2) The driver was enabling Jumbo frames by default, but was not allocating
dma buffers of sufficient size to handle the maximum possible packet
size that could be received. This led to memory corruption since DMAs were
occurring beyond the extent of the allocated receive buffers for certain types
of network traffic.
kernel BUG at net/core/skbuff.c:126!
Internal error: Oops - BUG: 0 [#1] SMP ARM
Modules linked in:
CPU: 0 PID: 563 Comm: sockperf Not tainted 3.13.0-rc6-01523-gf7111b9 #31
task: ef35e580 ti: ef252000 task.ti: ef252000
PC is at skb_panic+0x60/0x64
LR is at skb_panic+0x60/0x64
pc : [<c03c7c3c>] lr : [<c03c7c3c>] psr: 60000113
sp : ef253c18 ip : 60000113 fp : 00000000
r10: ef3a5400 r9 : 00000ebc r8 : ef3a546c
r7 : ee59f000 r6 : ee59f084 r5 : ee59ff40 r4 : ee59f140
r3 : 000003e2 r2 : 00000007 r1 : c0b9c420 r0 : 0000007d
Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
Control: 10c5387d Table: 2e8ac04a DAC: 00000015
Process sockperf (pid: 563, stack limit = 0xef252248)
Stack: (0xef253c18 to 0xef254000)
3c00: 00000ebc ee59f000
3c20: ee59f084 ee59ff40 ee59f140 c04a9cd8 ee8c50c0 00000ebc ee59ff40 00000000
3c40: ee59f140 c02d0ef0 00000056 ef1eda80 ee8c50c0 00000ebc 22bbef29 c0318f8c
3c60: 00000056 ef3a547c ffe2c716 c02c9c90 c0ba1298 ef3a5838 ef3a5838 ef3a5400
3c80: 000020c0 ee573840 000055cb ef3f2050 c053f0e0 c0319214 22b9b085 22d92813
3ca0: 00001c80 004b8e00 ef3a5400 ee573840 ef3f2064 22d92813 ef3f2064 000055cb
3cc0: ef3f2050 c031a19c ef252000 00000000 00000000 c0561bc0 00000000 ff00ffff
3ce0: c05621c0 ef3a5400 ef3f2064 ee573840 00000020 ef3f2064 000055cb ef3f2050
3d00: c053f0e0 c031cad0 c053e740 00000e60 00000000 00000000 ee573840 ef3a5400
3d20: ef0a6e00 00000000 ef3f2064 c032507c 00010000 00000020 c0561bc0 c0561bc0
3d40: ee599850 c032799c 00000000 ee573840 c055a380 ef3a5400 00000000 ef3f2064
3d60: ef3f2050 c032799c 0101c7c0 2b6755cb c059a280 c030e4d8 000055cb ffffffff
3d80: ee574fc0 c055a380 ee574000 ee573840 00002b67 ee573840 c03fe9c4 c053fa68
3da0: c055a380 00001f6f 00000000 ee573840 c053f0e0 c0304fdc ef0a6e01 ef3f2050
3dc0: ee573858 ef031000 ee573840 c03055d8 c0ba0c40 ef000f40 00100100 c053f0dc
3de0: c053ffdc c053f0f0 00000008 00000000 ef031000 c02da948 00001140 00000000
3e00: c0563c78 ef253e5f 00000020 ee573840 00000020 c053f0f0 ef313400 ee573840
3e20: c053f0e0 00000000 00000000 c05380c0 ef313400 00001000 00000015 c02df280
3e40: ee574000 ef001e00 00000000 00001080 00000042 005cd980 ef031500 ef031500
3e60: 00000000 c02df824 ef031500 c053e390 c0541084 f00b1e00 c05925e8 c02df864
3e80: 00001f5c ef031440 c053e390 c0278524 00000002 00000000 c0b9eb48 c02df280
3ea0: ee8c7180 00000100 c0542ca8 00000015 00000040 ef031500 ef031500 ef031500
3ec0: c027803c ef252000 00000040 000000ec c05380c0 c0b9eb40 c0b9eb48 c02df940
3ee0: ef060780 ffffa4dd c0564a9c c056343c 002e80a8 00000080 ef031500 00000001
3f00: c053808c ef252000 fffec100 00000003 00000004 002e80a8 0000000c c00258f0
3f20: 002e80a8 c005e704 00000005 00000100 c05634d0 c0538080 c05333e0 00000000
3f40: 0000000a c0565580 c05380c0 ffffa4dc c05434f4 00400100 00000004 c0534cd4
3f60: 00000098 00000000 fffec100 002e80a8 00000004 002e80a8 002a20e0 c0025da8
3f80: c0534cd4 c000f020 fffec10c c053ea60 ef253fb0 c0008530 0000ffe2 b6ef67f4
3fa0: 40000010 ffffffff 00000124 c0012f3c 0000ffe2 002e80f0 0000ffe2 00004000
3fc0: becb6338 becb6334 00000004 00000124 002e80a8 00000004 002e80a8 002a20e0
3fe0: becb6300 becb62f4 002773bb b6ef67f4 40000010 ffffffff 00000000 00000000
[<c03c7c3c>] (skb_panic+0x60/0x64) from [<c02d0ef0>] (skb_put+0x4c/0x50)
[<c02d0ef0>] (skb_put+0x4c/0x50) from [<c0318f8c>] (tcp_collapse+0x314/0x3ec)
[<c0318f8c>] (tcp_collapse+0x314/0x3ec) from [<c0319214>]
(tcp_try_rmem_schedule+0x1b0/0x3c4)
[<c0319214>] (tcp_try_rmem_schedule+0x1b0/0x3c4) from [<c031a19c>]
(tcp_data_queue+0x480/0xe6c)
[<c031a19c>] (tcp_data_queue+0x480/0xe6c) from [<c031cad0>]
(tcp_rcv_established+0x180/0x62c)
[<c031cad0>] (tcp_rcv_established+0x180/0x62c) from [<c032507c>]
(tcp_v4_do_rcv+0x13c/0x31c)
[<c032507c>] (tcp_v4_do_rcv+0x13c/0x31c) from [<c032799c>]
(tcp_v4_rcv+0x718/0x73c)
[<c032799c>] (tcp_v4_rcv+0x718/0x73c) from [<c0304fdc>]
(ip_local_deliver+0x98/0x274)
[<c0304fdc>] (ip_local_deliver+0x98/0x274) from [<c03055d8>]
(ip_rcv+0x420/0x758)
[<c03055d8>] (ip_rcv+0x420/0x758) from [<c02da948>]
(__netif_receive_skb_core+0x44c/0x5bc)
[<c02da948>] (__netif_receive_skb_core+0x44c/0x5bc) from [<c02df280>]
(netif_receive_skb+0x48/0xb4)
[<c02df280>] (netif_receive_skb+0x48/0xb4) from [<c02df824>]
(napi_gro_flush+0x70/0x94)
[<c02df824>] (napi_gro_flush+0x70/0x94) from [<c02df864>]
(napi_complete+0x1c/0x34)
[<c02df864>] (napi_complete+0x1c/0x34) from [<c0278524>]
(stmmac_poll+0x4e8/0x5c8)
[<c0278524>] (stmmac_poll+0x4e8/0x5c8) from [<c02df940>]
(net_rx_action+0xc4/0x1e4)
[<c02df940>] (net_rx_action+0xc4/0x1e4) from [<c00258f0>]
(__do_softirq+0x12c/0x2e8)
[<c00258f0>] (__do_softirq+0x12c/0x2e8) from [<c0025da8>] (irq_exit+0x78/0xac)
[<c0025da8>] (irq_exit+0x78/0xac) from [<c000f020>] (handle_IRQ+0x44/0x90)
[<c000f020>] (handle_IRQ+0x44/0x90) from [<c0008530>]
(gic_handle_irq+0x2c/0x5c)
[<c0008530>] (gic_handle_irq+0x2c/0x5c) from [<c0012f3c>]
(__irq_usr+0x3c/0x60)
3) The driver was setting the dma buffer size after allocating dma buffers,
which caused a system panic when changing the MTU.
BUG: Bad page state in process ifconfig pfn:2e850
page:c0b72a00 count:0 mapcount:0 mapping: (null) index:0x0
page flags: 0x200(arch_1)
Modules linked in:
CPU: 0 PID: 566 Comm: ifconfig Not tainted 3.13.0-rc6-01523-gf7111b9 #29
[<c001547c>] (unwind_backtrace+0x0/0xf8) from [<c00122dc>]
(show_stack+0x10/0x14)
[<c00122dc>] (show_stack+0x10/0x14) from [<c03c793c>] (dump_stack+0x70/0x88)
[<c03c793c>] (dump_stack+0x70/0x88) from [<c00b2620>] (bad_page+0xc8/0x118)
[<c00b2620>] (bad_page+0xc8/0x118) from [<c00b302c>]
(get_page_from_freelist+0x744/0x870)
[<c00b302c>] (get_page_from_freelist+0x744/0x870) from [<c00b40f4>]
(__alloc_pages_nodemask+0x118/0x86c)
[<c00b40f4>] (__alloc_pages_nodemask+0x118/0x86c) from [<c00b4858>]
(__get_free_pages+0x10/0x54)
[<c00b4858>] (__get_free_pages+0x10/0x54) from [<c00cba1c>]
(kmalloc_order_trace+0x24/0xa0)
[<c00cba1c>] (kmalloc_order_trace+0x24/0xa0) from [<c02d199c>]
(__kmalloc_reserve.isra.21+0x24/0x70)
[<c02d199c>] (__kmalloc_reserve.isra.21+0x24/0x70) from [<c02d240c>]
(__alloc_skb+0x68/0x13c)
[<c02d240c>] (__alloc_skb+0x68/0x13c) from [<c02d3930>]
(__netdev_alloc_skb+0x3c/0xe8)
[<c02d3930>] (__netdev_alloc_skb+0x3c/0xe8) from [<c0279378>]
(stmmac_open+0x63c/0x1024)
[<c0279378>] (stmmac_open+0x63c/0x1024) from [<c02e18cc>]
(__dev_open+0xa0/0xfc)
[<c02e18cc>] (__dev_open+0xa0/0xfc) from [<c02e1b40>]
(__dev_change_flags+0x94/0x158)
[<c02e1b40>] (__dev_change_flags+0x94/0x158) from [<c02e1c24>]
(dev_change_flags+0x18/0x48)
[<c02e1c24>] (dev_change_flags+0x18/0x48) from [<c0337bc0>]
(devinet_ioctl+0x638/0x700)
[<c0337bc0>] (devinet_ioctl+0x638/0x700) from [<c02c7aec>]
(sock_ioctl+0x64/0x290)
[<c02c7aec>] (sock_ioctl+0x64/0x290) from [<c0100890>]
(do_vfs_ioctl+0x78/0x5b8)
[<c0100890>] (do_vfs_ioctl+0x78/0x5b8) from [<c0100e0c>] (SyS_ioctl+0x3c/0x5c)
[<c0100e0c>] (SyS_ioctl+0x3c/0x5c) from [<c000e760>]
The fixes have been verified using reproducible, automated testing.
Signed-off-by: Vince Bridgers <vbridgers2013@xxxxxxxxx>
---
drivers/net/ethernet/stmicro/stmmac/common.h | 4 +++-
drivers/net/ethernet/stmicro/stmmac/dwmac1000.h | 7 ++-----
.../net/ethernet/stmicro/stmmac/dwmac1000_core.c | 7 ++++++-
.../net/ethernet/stmicro/stmmac/dwmac100_core.c | 2 +-
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 11 +++++++----
.../net/ethernet/stmicro/stmmac/stmmac_platform.c | 5 +++++
include/linux/stmmac.h | 1 +
7 files changed, 25 insertions(+), 12 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index fc94f20..97bfb6b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -293,6 +293,8 @@ struct dma_features {
#define STMMAC_CHAIN_MODE 0x1
#define STMMAC_RING_MODE 0x2
+#define JUMBO_LEN 9000
+
struct stmmac_desc_ops {
/* DMA RX descriptor ring initialization */
void (*init_rx_desc) (struct dma_desc *p, int disable_rx_ic, int mode,
@@ -369,7 +371,7 @@ struct stmmac_dma_ops {
struct stmmac_ops {
/* MAC core initialization */
- void (*core_init) (void __iomem *ioaddr);
+ void (*core_init) (void __iomem *ioaddr, int mtu);
/* Enable and verify that the IPC module is supported */
int (*rx_ipc) (void __iomem *ioaddr);
/* Dump MAC registers */
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000.h b/drivers/net/ethernet/stmicro/stmmac/dwmac1000.h
index c12aabb..f37d90f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000.h
@@ -126,11 +126,8 @@ enum power_event {
#define GMAC_ANE_PSE (3 << 7)
#define GMAC_ANE_PSE_SHIFT 7
- /* GMAC Configuration defines */
-#define GMAC_CONTROL_TC 0x01000000 /* Transmit Conf. in RGMII/SGMII */
-#define GMAC_CONTROL_WD 0x00800000 /* Disable Watchdog on receive */
-
/* GMAC Configuration defines */
+#define GMAC_CONTROL_2K 0x08000000 /* IEEE 802.3as 2K packets */
#define GMAC_CONTROL_TC 0x01000000 /* Transmit Conf. in RGMII/SGMII */
#define GMAC_CONTROL_WD 0x00800000 /* Disable Watchdog on receive */
#define GMAC_CONTROL_JD 0x00400000 /* Jabber disable */
@@ -156,7 +153,7 @@ enum inter_frame_gap {
#define GMAC_CONTROL_RE 0x00000004 /* Receiver Enable */
#define GMAC_CORE_INIT (GMAC_CONTROL_JD | GMAC_CONTROL_PS | GMAC_CONTROL_ACS | \
- GMAC_CONTROL_JE | GMAC_CONTROL_BE)
+ GMAC_CONTROL_BE)
/* GMAC Frame Filter defines */
#define GMAC_FRAME_FILTER_PR 0x00000001 /* Promiscuous Mode */
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
index cdd9268..b3e148e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
@@ -32,10 +32,15 @@
#include <asm/io.h>
#include "dwmac1000.h"
-static void dwmac1000_core_init(void __iomem *ioaddr)
+static void dwmac1000_core_init(void __iomem *ioaddr, int mtu)
{
u32 value = readl(ioaddr + GMAC_CONTROL);
value |= GMAC_CORE_INIT;
+ if (mtu > 1500)
+ value |= GMAC_CONTROL_2K;
+ if (mtu > 2000)
+ value |= GMAC_CONTROL_JE;
+
writel(value, ioaddr + GMAC_CONTROL);
/* Mask GMAC interrupts */
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c
index 5857d67..2ff767b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac100_core.c
@@ -32,7 +32,7 @@
#include <asm/io.h>
#include "dwmac100.h"
-static void dwmac100_core_init(void __iomem *ioaddr)
+static void dwmac100_core_init(void __iomem *ioaddr, int mtu)
{
u32 value = readl(ioaddr + MAC_CONTROL);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index b8e3a4c..4f5dfd7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -52,7 +52,6 @@
#include "stmmac.h"
#define STMMAC_ALIGN(x) L1_CACHE_ALIGN(x)
-#define JUMBO_LEN 9000
/* Module parameters */
#define TX_TIMEO 5000
@@ -91,7 +90,7 @@ static int tc = TC_DEFAULT;
module_param(tc, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(tc, "DMA threshold control value");
-#define DMA_BUFFER_SIZE BUF_SIZE_2KiB
+#define DMA_BUFFER_SIZE BUF_SIZE_4KiB
static int buf_sz = DMA_BUFFER_SIZE;
module_param(buf_sz, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(buf_sz, "DMA buffer size");
@@ -990,6 +989,8 @@ static int init_dma_desc_rings(struct net_device *dev)
if (bfsize < BUF_SIZE_16KiB)
bfsize = stmmac_set_bfsize(dev->mtu, priv->dma_buf_sz);
+ priv->dma_buf_sz = bfsize;
+
if (netif_msg_probe(priv))
pr_debug("%s: txsize %d, rxsize %d, bfsize %d\n", __func__,
txsize, rxsize, bfsize);
@@ -1079,7 +1080,6 @@ static int init_dma_desc_rings(struct net_device *dev)
}
priv->cur_rx = 0;
priv->dirty_rx = (unsigned int)(i - rxsize);
- priv->dma_buf_sz = bfsize;
buf_sz = bfsize;
/* Setup the chained descriptor addresses */
@@ -1642,7 +1642,7 @@ static int stmmac_open(struct net_device *dev)
priv->plat->bus_setup(priv->ioaddr);
/* Initialize the MAC Core */
- priv->hw->mac->core_init(priv->ioaddr);
+ priv->hw->mac->core_init(priv->ioaddr, dev->mtu);
/* Request the IRQ lines */
ret = request_irq(dev->irq, stmmac_interrupt,
@@ -2229,6 +2229,9 @@ static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
else
max_mtu = SKB_MAX_HEAD(NET_SKB_PAD + NET_IP_ALIGN);
+ if (priv->plat->maxmtu < max_mtu)
+ max_mtu = priv->plat->maxmtu;
+
if ((new_mtu < 46) || (new_mtu > max_mtu)) {
pr_err("%s: invalid MTU, max MTU is: %d\n", dev->name, max_mtu);
return -EINVAL;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 38bd1f4..1028c19 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -51,6 +51,10 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
sizeof(struct stmmac_mdio_bus_data),
GFP_KERNEL);
+ /* Set the maxmtu to a default of 1500 in case the
+ * parameter is not present in the device tree
+ */
+ plat->maxmtu = JUMBO_LEN;
/*
* Currently only the properties needed on SPEAr600
@@ -60,6 +64,7 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
if (of_device_is_compatible(np, "st,spear600-gmac") ||
of_device_is_compatible(np, "snps,dwmac-3.70a") ||
of_device_is_compatible(np, "snps,dwmac")) {
+ of_property_read_u32(np, "snps,max-mtu", &plat->maxmtu);
plat->has_gmac = 1;
plat->pmt = 1;
}
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index bb5deb0..9689706 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -110,6 +110,7 @@ struct plat_stmmacenet_data {
int force_sf_dma_mode;
int force_thresh_dma_mode;
int riwt_off;
+ int maxmtu;
void (*fix_mac_speed)(void *priv, unsigned int speed);
void (*bus_setup)(void __iomem *ioaddr);
int (*init)(struct platform_device *pdev);
--
1.7.9.5
--
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