Skip to content

Commit

Permalink
net: convert SMSC USB net drivers to hw_features
Browse files Browse the repository at this point in the history 
There's a race (not fixed here) in smsc75xx in setting RFE_CTL that's not
properly handled via rfe_ctl_lock. Spinlock is not a good tool here, as
this has to wait for URB completion (or maybe just submission) after issuing
register write request. Otherwise, the rfe_ctl might be changed just after
spin_unlock() and device left programmed with other value.

smsc95xx has increased hard_header_len for the case of TX checksumming.

smsc75xx is fixed to advertise IP+IPV6_CSUM instead of HW_CSUM as it does
not use csum_start/csum_offset.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
  • Loading branch information
Michał Mirosław authored and David S. Miller committed Apr 2, 2011
1 parent 98e778c commit 78e47fe
Show file tree
Hide file tree
Showing 2 changed files with 63 additions and 144 deletions.
124 changes: 44 additions & 80 deletions drivers/net/usb/smsc75xx.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -65,7 +65,6 @@ struct smsc75xx_priv {
struct usbnet *dev;
u32 rfe_ctl;
u32 multicast_hash_table[DP_SEL_VHF_HASH_LEN];
bool use_rx_csum;
struct mutex dataport_mutex;
spinlock_t rfe_ctl_lock;
struct work_struct set_multicast;
Expand Down Expand Up @@ -548,28 +547,6 @@ static void smsc75xx_status(struct usbnet *dev, struct urb *urb)
"unexpected interrupt, intdata=0x%08X", intdata);
}

/* Enable or disable Rx checksum offload engine */
static int smsc75xx_set_rx_csum_offload(struct usbnet *dev)
{
struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
unsigned long flags;
int ret;

spin_lock_irqsave(&pdata->rfe_ctl_lock, flags);

if (pdata->use_rx_csum)
pdata->rfe_ctl |= RFE_CTL_TCPUDP_CKM | RFE_CTL_IP_CKM;
else
pdata->rfe_ctl &= ~(RFE_CTL_TCPUDP_CKM | RFE_CTL_IP_CKM);

spin_unlock_irqrestore(&pdata->rfe_ctl_lock, flags);

ret = smsc75xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);
check_warn_return(ret, "Error writing RFE_CTL");

return 0;
}

static int smsc75xx_ethtool_get_eeprom_len(struct net_device *net)
{
return MAX_EEPROM_SIZE;
Expand Down Expand Up @@ -599,34 +576,6 @@ static int smsc75xx_ethtool_set_eeprom(struct net_device *netdev,
return smsc75xx_write_eeprom(dev, ee->offset, ee->len, data);
}

static u32 smsc75xx_ethtool_get_rx_csum(struct net_device *netdev)
{
struct usbnet *dev = netdev_priv(netdev);
struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);

return pdata->use_rx_csum;
}

static int smsc75xx_ethtool_set_rx_csum(struct net_device *netdev, u32 val)
{
struct usbnet *dev = netdev_priv(netdev);
struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);

pdata->use_rx_csum = !!val;

return smsc75xx_set_rx_csum_offload(dev);
}

static int smsc75xx_ethtool_set_tso(struct net_device *netdev, u32 data)
{
if (data)
netdev->features |= NETIF_F_TSO | NETIF_F_TSO6;
else
netdev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);

return 0;
}

static const struct ethtool_ops smsc75xx_ethtool_ops = {
.get_link = usbnet_get_link,
.nway_reset = usbnet_nway_reset,
Expand All @@ -638,12 +587,6 @@ static const struct ethtool_ops smsc75xx_ethtool_ops = {
.get_eeprom_len = smsc75xx_ethtool_get_eeprom_len,
.get_eeprom = smsc75xx_ethtool_get_eeprom,
.set_eeprom = smsc75xx_ethtool_set_eeprom,
.get_tx_csum = ethtool_op_get_tx_csum,
.set_tx_csum = ethtool_op_set_tx_hw_csum,
.get_rx_csum = smsc75xx_ethtool_get_rx_csum,
.set_rx_csum = smsc75xx_ethtool_set_rx_csum,
.get_tso = ethtool_op_get_tso,
.set_tso = smsc75xx_ethtool_set_tso,
};

static int smsc75xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
Expand Down Expand Up @@ -782,6 +725,30 @@ static int smsc75xx_change_mtu(struct net_device *netdev, int new_mtu)
return usbnet_change_mtu(netdev, new_mtu);
}

/* Enable or disable Rx checksum offload engine */
static int smsc75xx_set_features(struct net_device *netdev, u32 features)
{
struct usbnet *dev = netdev_priv(netdev);
struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
unsigned long flags;
int ret;

spin_lock_irqsave(&pdata->rfe_ctl_lock, flags);

if (features & NETIF_F_RXCSUM)
pdata->rfe_ctl |= RFE_CTL_TCPUDP_CKM | RFE_CTL_IP_CKM;
else
pdata->rfe_ctl &= ~(RFE_CTL_TCPUDP_CKM | RFE_CTL_IP_CKM);

spin_unlock_irqrestore(&pdata->rfe_ctl_lock, flags);
/* it's racing here! */

ret = smsc75xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);
check_warn_return(ret, "Error writing RFE_CTL");

return 0;
}

static int smsc75xx_reset(struct usbnet *dev)
{
struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
Expand Down Expand Up @@ -960,11 +927,7 @@ static int smsc75xx_reset(struct usbnet *dev)
netif_dbg(dev, ifup, dev->net, "RFE_CTL set to 0x%08x", pdata->rfe_ctl);

/* Enable or disable checksum offload engines */
ethtool_op_set_tx_hw_csum(dev->net, DEFAULT_TX_CSUM_ENABLE);
ret = smsc75xx_set_rx_csum_offload(dev);
check_warn_return(ret, "Failed to set rx csum offload: %d", ret);

smsc75xx_ethtool_set_tso(dev->net, DEFAULT_TSO_ENABLE);
smsc75xx_set_features(dev->net, dev->net->features);

smsc75xx_set_multicast(dev->net);

Expand Down Expand Up @@ -1037,6 +1000,7 @@ static const struct net_device_ops smsc75xx_netdev_ops = {
.ndo_validate_addr = eth_validate_addr,
.ndo_do_ioctl = smsc75xx_ioctl,
.ndo_set_multicast_list = smsc75xx_set_multicast,
.ndo_set_features = smsc75xx_set_features,
};

static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)
Expand Down Expand Up @@ -1065,10 +1029,17 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)

INIT_WORK(&pdata->set_multicast, smsc75xx_deferred_multicast_write);

pdata->use_rx_csum = DEFAULT_RX_CSUM_ENABLE;
if (DEFAULT_TX_CSUM_ENABLE) {
dev->net->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
if (DEFAULT_TSO_ENABLE)
dev->net->features |= NETIF_F_SG |
NETIF_F_TSO | NETIF_F_TSO6;
}
if (DEFAULT_RX_CSUM_ENABLE)
dev->net->features |= NETIF_F_RXCSUM;

/* We have to advertise SG otherwise TSO cannot be enabled */
dev->net->features |= NETIF_F_SG;
dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
NETIF_F_SG | NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_RXCSUM;

/* Init all registers */
ret = smsc75xx_reset(dev);
Expand All @@ -1091,10 +1062,11 @@ static void smsc75xx_unbind(struct usbnet *dev, struct usb_interface *intf)
}
}

static void smsc75xx_rx_csum_offload(struct sk_buff *skb, u32 rx_cmd_a,
u32 rx_cmd_b)
static void smsc75xx_rx_csum_offload(struct usbnet *dev, struct sk_buff *skb,
u32 rx_cmd_a, u32 rx_cmd_b)
{
if (unlikely(rx_cmd_a & RX_CMD_A_LCSM)) {
if (!(dev->net->features & NETIF_F_RXCSUM) ||
unlikely(rx_cmd_a & RX_CMD_A_LCSM)) {
skb->ip_summed = CHECKSUM_NONE;
} else {
skb->csum = ntohs((u16)(rx_cmd_b >> RX_CMD_B_CSUM_SHIFT));
Expand All @@ -1104,8 +1076,6 @@ static void smsc75xx_rx_csum_offload(struct sk_buff *skb, u32 rx_cmd_a,

static int smsc75xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);

while (skb->len > 0) {
u32 rx_cmd_a, rx_cmd_b, align_count, size;
struct sk_buff *ax_skb;
Expand Down Expand Up @@ -1145,11 +1115,8 @@ static int smsc75xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)

/* last frame in this batch */
if (skb->len == size) {
if (pdata->use_rx_csum)
smsc75xx_rx_csum_offload(skb, rx_cmd_a,
rx_cmd_b);
else
skb->ip_summed = CHECKSUM_NONE;
smsc75xx_rx_csum_offload(dev, skb, rx_cmd_a,
rx_cmd_b);

skb_trim(skb, skb->len - 4); /* remove fcs */
skb->truesize = size + sizeof(struct sk_buff);
Expand All @@ -1167,11 +1134,8 @@ static int smsc75xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
ax_skb->data = packet;
skb_set_tail_pointer(ax_skb, size);

if (pdata->use_rx_csum)
smsc75xx_rx_csum_offload(ax_skb, rx_cmd_a,
rx_cmd_b);
else
ax_skb->ip_summed = CHECKSUM_NONE;
smsc75xx_rx_csum_offload(dev, ax_skb, rx_cmd_a,
rx_cmd_b);

skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
ax_skb->truesize = size + sizeof(struct sk_buff);
Expand Down
83 changes: 19 additions & 64 deletions drivers/net/usb/smsc95xx.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -52,8 +52,6 @@ struct smsc95xx_priv {
u32 hash_hi;
u32 hash_lo;
spinlock_t mac_cr_lock;
bool use_tx_csum;
bool use_rx_csum;
};

struct usb_context {
Expand Down Expand Up @@ -517,22 +515,24 @@ static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
}

/* Enable or disable Tx & Rx checksum offload engines */
static int smsc95xx_set_csums(struct usbnet *dev)
static int smsc95xx_set_features(struct net_device *netdev, u32 features)
{
struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
struct usbnet *dev = netdev_priv(netdev);
u32 read_buf;
int ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
int ret;

ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
if (ret < 0) {
netdev_warn(dev->net, "Failed to read COE_CR: %d\n", ret);
return ret;
}

if (pdata->use_tx_csum)
if (features & NETIF_F_HW_CSUM)
read_buf |= Tx_COE_EN_;
else
read_buf &= ~Tx_COE_EN_;

if (pdata->use_rx_csum)
if (features & NETIF_F_RXCSUM)
read_buf |= Rx_COE_EN_;
else
read_buf &= ~Rx_COE_EN_;
Expand Down Expand Up @@ -576,43 +576,6 @@ static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
}

static u32 smsc95xx_ethtool_get_rx_csum(struct net_device *netdev)
{
struct usbnet *dev = netdev_priv(netdev);
struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);

return pdata->use_rx_csum;
}

static int smsc95xx_ethtool_set_rx_csum(struct net_device *netdev, u32 val)
{
struct usbnet *dev = netdev_priv(netdev);
struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);

pdata->use_rx_csum = !!val;

return smsc95xx_set_csums(dev);
}

static u32 smsc95xx_ethtool_get_tx_csum(struct net_device *netdev)
{
struct usbnet *dev = netdev_priv(netdev);
struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);

return pdata->use_tx_csum;
}

static int smsc95xx_ethtool_set_tx_csum(struct net_device *netdev, u32 val)
{
struct usbnet *dev = netdev_priv(netdev);
struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);

pdata->use_tx_csum = !!val;

ethtool_op_set_tx_hw_csum(netdev, pdata->use_tx_csum);
return smsc95xx_set_csums(dev);
}

static const struct ethtool_ops smsc95xx_ethtool_ops = {
.get_link = usbnet_get_link,
.nway_reset = usbnet_nway_reset,
Expand All @@ -624,10 +587,6 @@ static const struct ethtool_ops smsc95xx_ethtool_ops = {
.get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
.get_eeprom = smsc95xx_ethtool_get_eeprom,
.set_eeprom = smsc95xx_ethtool_set_eeprom,
.get_tx_csum = smsc95xx_ethtool_get_tx_csum,
.set_tx_csum = smsc95xx_ethtool_set_tx_csum,
.get_rx_csum = smsc95xx_ethtool_get_rx_csum,
.set_rx_csum = smsc95xx_ethtool_set_rx_csum,
};

static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
Expand Down Expand Up @@ -755,7 +714,6 @@ static int smsc95xx_phy_initialize(struct usbnet *dev)
static int smsc95xx_reset(struct usbnet *dev)
{
struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
struct net_device *netdev = dev->net;
u32 read_buf, write_buf, burst_cap;
int ret = 0, timeout;

Expand Down Expand Up @@ -975,12 +933,7 @@ static int smsc95xx_reset(struct usbnet *dev)
}

/* Enable or disable checksum offload engines */
ethtool_op_set_tx_hw_csum(netdev, pdata->use_tx_csum);
ret = smsc95xx_set_csums(dev);
if (ret < 0) {
netdev_warn(dev->net, "Failed to set csum offload: %d\n", ret);
return ret;
}
smsc95xx_set_features(dev->net, dev->net->features);

smsc95xx_set_multicast(dev->net);

Expand Down Expand Up @@ -1019,6 +972,7 @@ static const struct net_device_ops smsc95xx_netdev_ops = {
.ndo_validate_addr = eth_validate_addr,
.ndo_do_ioctl = smsc95xx_ioctl,
.ndo_set_multicast_list = smsc95xx_set_multicast,
.ndo_set_features = smsc95xx_set_features,
};

static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
Expand All @@ -1045,8 +999,12 @@ static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)

spin_lock_init(&pdata->mac_cr_lock);

pdata->use_tx_csum = DEFAULT_TX_CSUM_ENABLE;
pdata->use_rx_csum = DEFAULT_RX_CSUM_ENABLE;
if (DEFAULT_TX_CSUM_ENABLE)
dev->net->features |= NETIF_F_HW_CSUM;
if (DEFAULT_RX_CSUM_ENABLE)
dev->net->features |= NETIF_F_RXCSUM;

dev->net->hw_features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM;

smsc95xx_init_mac_address(dev);

Expand All @@ -1056,7 +1014,7 @@ static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
dev->net->netdev_ops = &smsc95xx_netdev_ops;
dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
dev->net->flags |= IFF_MULTICAST;
dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD;
dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
return 0;
}

Expand All @@ -1080,8 +1038,6 @@ static void smsc95xx_rx_csum_offload(struct sk_buff *skb)

static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);

while (skb->len > 0) {
u32 header, align_count;
struct sk_buff *ax_skb;
Expand Down Expand Up @@ -1123,7 +1079,7 @@ static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)

/* last frame in this batch */
if (skb->len == size) {
if (pdata->use_rx_csum)
if (dev->net->features & NETIF_F_RXCSUM)
smsc95xx_rx_csum_offload(skb);
skb_trim(skb, skb->len - 4); /* remove fcs */
skb->truesize = size + sizeof(struct sk_buff);
Expand All @@ -1141,7 +1097,7 @@ static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
ax_skb->data = packet;
skb_set_tail_pointer(ax_skb, size);

if (pdata->use_rx_csum)
if (dev->net->features & NETIF_F_RXCSUM)
smsc95xx_rx_csum_offload(ax_skb);
skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
ax_skb->truesize = size + sizeof(struct sk_buff);
Expand Down Expand Up @@ -1174,8 +1130,7 @@ static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
struct sk_buff *skb, gfp_t flags)
{
struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
bool csum = pdata->use_tx_csum && (skb->ip_summed == CHECKSUM_PARTIAL);
bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
u32 tx_cmd_a, tx_cmd_b;

Expand Down

0 comments on commit 78e47fe

Please sign in to comment.