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-rw-r--r--drivers/net/can/at91_can.c1186
-rw-r--r--drivers/net/davinci_emac.c9
-rw-r--r--drivers/net/virtio_net.c229
3 files changed, 1282 insertions, 142 deletions
diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
new file mode 100644
index 000000000000..f67ae285a35a
--- /dev/null
+++ b/drivers/net/can/at91_can.c
@@ -0,0 +1,1186 @@
+/*
+ * at91_can.c - CAN network driver for AT91 SoC CAN controller
+ *
+ * (C) 2007 by Hans J. Koch <hjk@linutronix.de>
+ * (C) 2008, 2009 by Marc Kleine-Budde <kernel@pengutronix.de>
+ *
+ * This software may be distributed under the terms of the GNU General
+ * Public License ("GPL") version 2 as distributed in the 'COPYING'
+ * file from the main directory of the linux kernel source.
+ *
+ * Send feedback to <socketcan-users@lists.berlios.de>
+ *
+ *
+ * Your platform definition file should specify something like:
+ *
+ * static struct at91_can_data ek_can_data = {
+ * transceiver_switch = sam9263ek_transceiver_switch,
+ * };
+ *
+ * at91_add_device_can(&ek_can_data);
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/errno.h>
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+#include <mach/board.h>
+
+#define DRV_NAME "at91_can"
+#define AT91_NAPI_WEIGHT 12
+
+/*
+ * RX/TX Mailbox split
+ * don't dare to touch
+ */
+#define AT91_MB_RX_NUM 12
+#define AT91_MB_TX_SHIFT 2
+
+#define AT91_MB_RX_FIRST 0
+#define AT91_MB_RX_LAST (AT91_MB_RX_FIRST + AT91_MB_RX_NUM - 1)
+
+#define AT91_MB_RX_MASK(i) ((1 << (i)) - 1)
+#define AT91_MB_RX_SPLIT 8
+#define AT91_MB_RX_LOW_LAST (AT91_MB_RX_SPLIT - 1)
+#define AT91_MB_RX_LOW_MASK (AT91_MB_RX_MASK(AT91_MB_RX_SPLIT))
+
+#define AT91_MB_TX_NUM (1 << AT91_MB_TX_SHIFT)
+#define AT91_MB_TX_FIRST (AT91_MB_RX_LAST + 1)
+#define AT91_MB_TX_LAST (AT91_MB_TX_FIRST + AT91_MB_TX_NUM - 1)
+
+#define AT91_NEXT_PRIO_SHIFT (AT91_MB_TX_SHIFT)
+#define AT91_NEXT_PRIO_MASK (0xf << AT91_MB_TX_SHIFT)
+#define AT91_NEXT_MB_MASK (AT91_MB_TX_NUM - 1)
+#define AT91_NEXT_MASK ((AT91_MB_TX_NUM - 1) | AT91_NEXT_PRIO_MASK)
+
+/* Common registers */
+enum at91_reg {
+ AT91_MR = 0x000,
+ AT91_IER = 0x004,
+ AT91_IDR = 0x008,
+ AT91_IMR = 0x00C,
+ AT91_SR = 0x010,
+ AT91_BR = 0x014,
+ AT91_TIM = 0x018,
+ AT91_TIMESTP = 0x01C,
+ AT91_ECR = 0x020,
+ AT91_TCR = 0x024,
+ AT91_ACR = 0x028,
+};
+
+/* Mailbox registers (0 <= i <= 15) */
+#define AT91_MMR(i) (enum at91_reg)(0x200 + ((i) * 0x20))
+#define AT91_MAM(i) (enum at91_reg)(0x204 + ((i) * 0x20))
+#define AT91_MID(i) (enum at91_reg)(0x208 + ((i) * 0x20))
+#define AT91_MFID(i) (enum at91_reg)(0x20C + ((i) * 0x20))
+#define AT91_MSR(i) (enum at91_reg)(0x210 + ((i) * 0x20))
+#define AT91_MDL(i) (enum at91_reg)(0x214 + ((i) * 0x20))
+#define AT91_MDH(i) (enum at91_reg)(0x218 + ((i) * 0x20))
+#define AT91_MCR(i) (enum at91_reg)(0x21C + ((i) * 0x20))
+
+/* Register bits */
+#define AT91_MR_CANEN BIT(0)
+#define AT91_MR_LPM BIT(1)
+#define AT91_MR_ABM BIT(2)
+#define AT91_MR_OVL BIT(3)
+#define AT91_MR_TEOF BIT(4)
+#define AT91_MR_TTM BIT(5)
+#define AT91_MR_TIMFRZ BIT(6)
+#define AT91_MR_DRPT BIT(7)
+
+#define AT91_SR_RBSY BIT(29)
+
+#define AT91_MMR_PRIO_SHIFT (16)
+
+#define AT91_MID_MIDE BIT(29)
+
+#define AT91_MSR_MRTR BIT(20)
+#define AT91_MSR_MABT BIT(22)
+#define AT91_MSR_MRDY BIT(23)
+#define AT91_MSR_MMI BIT(24)
+
+#define AT91_MCR_MRTR BIT(20)
+#define AT91_MCR_MTCR BIT(23)
+
+/* Mailbox Modes */
+enum at91_mb_mode {
+ AT91_MB_MODE_DISABLED = 0,
+ AT91_MB_MODE_RX = 1,
+ AT91_MB_MODE_RX_OVRWR = 2,
+ AT91_MB_MODE_TX = 3,
+ AT91_MB_MODE_CONSUMER = 4,
+ AT91_MB_MODE_PRODUCER = 5,
+};
+
+/* Interrupt mask bits */
+#define AT91_IRQ_MB_RX ((1 << (AT91_MB_RX_LAST + 1)) \
+ - (1 << AT91_MB_RX_FIRST))
+#define AT91_IRQ_MB_TX ((1 << (AT91_MB_TX_LAST + 1)) \
+ - (1 << AT91_MB_TX_FIRST))
+#define AT91_IRQ_MB_ALL (AT91_IRQ_MB_RX | AT91_IRQ_MB_TX)
+
+#define AT91_IRQ_ERRA (1 << 16)
+#define AT91_IRQ_WARN (1 << 17)
+#define AT91_IRQ_ERRP (1 << 18)
+#define AT91_IRQ_BOFF (1 << 19)
+#define AT91_IRQ_SLEEP (1 << 20)
+#define AT91_IRQ_WAKEUP (1 << 21)
+#define AT91_IRQ_TOVF (1 << 22)
+#define AT91_IRQ_TSTP (1 << 23)
+#define AT91_IRQ_CERR (1 << 24)
+#define AT91_IRQ_SERR (1 << 25)
+#define AT91_IRQ_AERR (1 << 26)
+#define AT91_IRQ_FERR (1 << 27)
+#define AT91_IRQ_BERR (1 << 28)
+
+#define AT91_IRQ_ERR_ALL (0x1fff0000)
+#define AT91_IRQ_ERR_FRAME (AT91_IRQ_CERR | AT91_IRQ_SERR | \
+ AT91_IRQ_AERR | AT91_IRQ_FERR | AT91_IRQ_BERR)
+#define AT91_IRQ_ERR_LINE (AT91_IRQ_ERRA | AT91_IRQ_WARN | \
+ AT91_IRQ_ERRP | AT91_IRQ_BOFF)
+
+#define AT91_IRQ_ALL (0x1fffffff)
+
+struct at91_priv {
+ struct can_priv can; /* must be the first member! */
+ struct net_device *dev;
+ struct napi_struct napi;
+
+ void __iomem *reg_base;
+
+ u32 reg_sr;
+ unsigned int tx_next;
+ unsigned int tx_echo;
+ unsigned int rx_next;
+
+ struct clk *clk;
+ struct at91_can_data *pdata;
+};
+
+static struct can_bittiming_const at91_bittiming_const = {
+ .tseg1_min = 4,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 2,
+ .brp_max = 128,
+ .brp_inc = 1,
+};
+
+static inline int get_tx_next_mb(const struct at91_priv *priv)
+{
+ return (priv->tx_next & AT91_NEXT_MB_MASK) + AT91_MB_TX_FIRST;
+}
+
+static inline int get_tx_next_prio(const struct at91_priv *priv)
+{
+ return (priv->tx_next >> AT91_NEXT_PRIO_SHIFT) & 0xf;
+}
+
+static inline int get_tx_echo_mb(const struct at91_priv *priv)
+{
+ return (priv->tx_echo & AT91_NEXT_MB_MASK) + AT91_MB_TX_FIRST;
+}
+
+static inline u32 at91_read(const struct at91_priv *priv, enum at91_reg reg)
+{
+ return readl(priv->reg_base + reg);
+}
+
+static inline void at91_write(const struct at91_priv *priv, enum at91_reg reg,
+ u32 value)
+{
+ writel(value, priv->reg_base + reg);
+}
+
+static inline void set_mb_mode_prio(const struct at91_priv *priv,
+ unsigned int mb, enum at91_mb_mode mode, int prio)
+{
+ at91_write(priv, AT91_MMR(mb), (mode << 24) | (prio << 16));
+}
+
+static inline void set_mb_mode(const struct at91_priv *priv, unsigned int mb,
+ enum at91_mb_mode mode)
+{
+ set_mb_mode_prio(priv, mb, mode, 0);
+}
+
+static struct sk_buff *alloc_can_skb(struct net_device *dev,
+ struct can_frame **cf)
+{
+ struct sk_buff *skb;
+
+ skb = netdev_alloc_skb(dev, sizeof(struct can_frame));
+ if (unlikely(!skb))
+ return NULL;
+
+ skb->protocol = htons(ETH_P_CAN);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
+
+ return skb;
+}
+
+static struct sk_buff *alloc_can_err_skb(struct net_device *dev,
+ struct can_frame **cf)
+{
+ struct sk_buff *skb;
+
+ skb = alloc_can_skb(dev, cf);
+ if (unlikely(!skb))
+ return NULL;
+
+ memset(*cf, 0, sizeof(struct can_frame));
+ (*cf)->can_id = CAN_ERR_FLAG;
+ (*cf)->can_dlc = CAN_ERR_DLC;
+
+ return skb;
+}
+
+/*
+ * Swtich transceiver on or off
+ */
+static void at91_transceiver_switch(const struct at91_priv *priv, int on)
+{
+ if (priv->pdata && priv->pdata->transceiver_switch)
+ priv->pdata->transceiver_switch(on);
+}
+
+static void at91_setup_mailboxes(struct net_device *dev)
+{
+ struct at91_priv *priv = netdev_priv(dev);
+ unsigned int i;
+
+ /*
+ * The first 12 mailboxes are used as a reception FIFO. The
+ * last mailbox is configured with overwrite option. The
+ * overwrite flag indicates a FIFO overflow.
+ */
+ for (i = AT91_MB_RX_FIRST; i < AT91_MB_RX_LAST; i++)
+ set_mb_mode(priv, i, AT91_MB_MODE_RX);
+ set_mb_mode(priv, AT91_MB_RX_LAST, AT91_MB_MODE_RX_OVRWR);
+
+ /* The last 4 mailboxes are used for transmitting. */
+ for (i = AT91_MB_TX_FIRST; i <= AT91_MB_TX_LAST; i++)
+ set_mb_mode_prio(priv, i, AT91_MB_MODE_TX, 0);
+
+ /* Reset tx and rx helper pointers */
+ priv->tx_next = priv->tx_echo = priv->rx_next = 0;
+}
+
+static int at91_set_bittiming(struct net_device *dev)
+{
+ const struct at91_priv *priv = netdev_priv(dev);
+ const struct can_bittiming *bt = &priv->can.bittiming;
+ u32 reg_br;
+
+ reg_br = ((priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) << 24) |
+ ((bt->brp - 1) << 16) | ((bt->sjw - 1) << 12) |
+ ((bt->prop_seg - 1) << 8) | ((bt->phase_seg1 - 1) << 4) |
+ ((bt->phase_seg2 - 1) << 0);
+
+ dev_info(dev->dev.parent, "writing AT91_BR: 0x%08x\n", reg_br);
+
+ at91_write(priv, AT91_BR, reg_br);
+
+ return 0;
+}
+
+static void at91_chip_start(struct net_device *dev)
+{
+ struct at91_priv *priv = netdev_priv(dev);
+ u32 reg_mr, reg_ier;
+
+ /* disable interrupts */
+ at91_write(priv, AT91_IDR, AT91_IRQ_ALL);
+
+ /* disable chip */
+ reg_mr = at91_read(priv, AT91_MR);
+ at91_write(priv, AT91_MR, reg_mr & ~AT91_MR_CANEN);
+
+ at91_setup_mailboxes(dev);
+ at91_transceiver_switch(priv, 1);
+
+ /* enable chip */
+ at91_write(priv, AT91_MR, AT91_MR_CANEN);
+
+ priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+ /* Enable interrupts */
+ reg_ier = AT91_IRQ_MB_RX | AT91_IRQ_ERRP | AT91_IRQ_ERR_FRAME;
+ at91_write(priv, AT91_IDR, AT91_IRQ_ALL);
+ at91_write(priv, AT91_IER, reg_ier);
+}
+
+static void at91_chip_stop(struct net_device *dev, enum can_state state)
+{
+ struct at91_priv *priv = netdev_priv(dev);
+ u32 reg_mr;
+
+ /* disable interrupts */
+ at91_write(priv, AT91_IDR, AT91_IRQ_ALL);
+
+ reg_mr = at91_read(priv, AT91_MR);
+ at91_write(priv, AT91_MR, reg_mr & ~AT91_MR_CANEN);
+
+ at91_transceiver_switch(priv, 0);
+ priv->can.state = state;
+}
+
+/*
+ * theory of operation:
+ *
+ * According to the datasheet priority 0 is the highest priority, 15
+ * is the lowest. If two mailboxes have the same priority level the
+ * message of the mailbox with the lowest number is sent first.
+ *
+ * We use the first TX mailbox (AT91_MB_TX_FIRST) with prio 0, then
+ * the next mailbox with prio 0, and so on, until all mailboxes are
+ * used. Then we start from the beginning with mailbox
+ * AT91_MB_TX_FIRST, but with prio 1, mailbox AT91_MB_TX_FIRST + 1
+ * prio 1. When we reach the last mailbox with prio 15, we have to
+ * stop sending, waiting for all messages to be delivered, then start
+ * again with mailbox AT91_MB_TX_FIRST prio 0.
+ *
+ * We use the priv->tx_next as counter for the next transmission
+ * mailbox, but without the offset AT91_MB_TX_FIRST. The lower bits
+ * encode the mailbox number, the upper 4 bits the mailbox priority:
+ *
+ * priv->tx_next = (prio << AT91_NEXT_PRIO_SHIFT) ||
+ * (mb - AT91_MB_TX_FIRST);
+ *
+ */
+static netdev_tx_t at91_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct at91_priv *priv = netdev_priv(dev);
+ struct net_device_stats *stats = &dev->stats;
+ struct can_frame *cf = (struct can_frame *)skb->data;
+ unsigned int mb, prio;
+ u32 reg_mid, reg_mcr;
+
+ mb = get_tx_next_mb(priv);
+ prio = get_tx_next_prio(priv);
+
+ if (unlikely(!(at91_read(priv, AT91_MSR(mb)) & AT91_MSR_MRDY))) {
+ netif_stop_queue(dev);
+
+ dev_err(dev->dev.parent,
+ "BUG! TX buffer full when queue awake!\n");
+ return NETDEV_TX_BUSY;
+ }
+
+ if (cf->can_id & CAN_EFF_FLAG)
+ reg_mid = (cf->can_id & CAN_EFF_MASK) | AT91_MID_MIDE;
+ else
+ reg_mid = (cf->can_id & CAN_SFF_MASK) << 18;
+
+ reg_mcr = ((cf->can_id & CAN_RTR_FLAG) ? AT91_MCR_MRTR : 0) |
+ (cf->can_dlc << 16) | AT91_MCR_MTCR;
+
+ /* disable MB while writing ID (see datasheet) */
+ set_mb_mode(priv, mb, AT91_MB_MODE_DISABLED);
+ at91_write(priv, AT91_MID(mb), reg_mid);
+ set_mb_mode_prio(priv, mb, AT91_MB_MODE_TX, prio);
+
+ at91_write(priv, AT91_MDL(mb), *(u32 *)(cf->data + 0));
+ at91_write(priv, AT91_MDH(mb), *(u32 *)(cf->data + 4));
+
+ /* This triggers transmission */
+ at91_write(priv, AT91_MCR(mb), reg_mcr);
+
+ stats->tx_bytes += cf->can_dlc;
+ dev->trans_start = jiffies;
+
+ /* _NOTE_: substract AT91_MB_TX_FIRST offset from mb! */
+ can_put_echo_skb(skb, dev, mb - AT91_MB_TX_FIRST);
+
+ /*
+ * we have to stop the queue and deliver all messages in case
+ * of a prio+mb counter wrap around. This is the case if
+ * tx_next buffer prio and mailbox equals 0.
+ *
+ * also stop the queue if next buffer is still in use
+ * (== not ready)
+ */
+ priv->tx_next++;
+ if (!(at91_read(priv, AT91_MSR(get_tx_next_mb(priv))) &
+ AT91_MSR_MRDY) ||
+ (priv->tx_next & AT91_NEXT_MASK) == 0)
+ netif_stop_queue(dev);
+
+ /* Enable interrupt for this mailbox */
+ at91_write(priv, AT91_IER, 1 << mb);
+
+ return NETDEV_TX_OK;
+}
+
+/**
+ * at91_activate_rx_low - activate lower rx mailboxes
+ * @priv: a91 context
+ *
+ * Reenables the lower mailboxes for reception of new CAN messages
+ */
+static inline void at91_activate_rx_low(const struct at91_priv *priv)
+{
+ u32 mask = AT91_MB_RX_LOW_MASK;
+ at91_write(priv, AT91_TCR, mask);
+}
+
+/**
+ * at91_activate_rx_mb - reactive single rx mailbox
+ * @priv: a91 context
+ * @mb: mailbox to reactivate
+ *
+ * Reenables given mailbox for reception of new CAN messages
+ */
+static inline void at91_activate_rx_mb(const struct at91_priv *priv,
+ unsigned int mb)
+{
+ u32 mask = 1 << mb;
+ at91_write(priv, AT91_TCR, mask);
+}
+
+/**
+ * at91_rx_overflow_err - send error frame due to rx overflow
+ * @dev: net device
+ */
+static void at91_rx_overflow_err(struct net_device *dev)
+{
+ struct net_device_stats *stats = &dev->stats;
+ struct sk_buff *skb;
+ struct can_frame *cf;
+
+ dev_dbg(dev->dev.parent, "RX buffer overflow\n");
+ stats->rx_over_errors++;
+ stats->rx_errors++;
+
+ skb = alloc_can_err_skb(dev, &cf);
+ if (unlikely(!skb))
+ return;
+
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
+ netif_receive_skb(skb);
+
+ stats->rx_packets++;
+ stats->rx_bytes += cf->can_dlc;
+}
+
+/**
+ * at91_read_mb - read CAN msg from mailbox (lowlevel impl)
+ * @dev: net device
+ * @mb: mailbox number to read from
+ * @cf: can frame where to store message
+ *
+ * Reads a CAN message from the given mailbox and stores data into
+ * given can frame. "mb" and "cf" must be valid.
+ */
+static void at91_read_mb(struct net_device *dev, unsigned int mb,
+ struct can_frame *cf)
+{
+ const struct at91_priv *priv = netdev_priv(dev);
+ u32 reg_msr, reg_mid;
+
+ reg_mid = at91_read(priv, AT91_MID(mb));
+ if (reg_mid & AT91_MID_MIDE)
+ cf->can_id = ((reg_mid >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG;
+ else
+ cf->can_id = (reg_mid >> 18) & CAN_SFF_MASK;
+
+ reg_msr = at91_read(priv, AT91_MSR(mb));
+ if (reg_msr & AT91_MSR_MRTR)
+ cf->can_id |= CAN_RTR_FLAG;
+ cf->can_dlc = min_t(__u8, (reg_msr >> 16) & 0xf, 8);
+
+ *(u32 *)(cf->data + 0) = at91_read(priv, AT91_MDL(mb));
+ *(u32 *)(cf->data + 4) = at91_read(priv, AT91_MDH(mb));
+
+ if (unlikely(mb == AT91_MB_RX_LAST && reg_msr & AT91_MSR_MMI))
+ at91_rx_overflow_err(dev);
+}
+
+/**
+ * at91_read_msg - read CAN message from mailbox
+ * @dev: net device
+ * @mb: mail box to read from
+ *
+ * Reads a CAN message from given mailbox, and put into linux network
+ * RX queue, does all housekeeping chores (stats, ...)
+ */
+static void at91_read_msg(struct net_device *dev, unsigned int mb)
+{
+ struct net_device_stats *stats = &dev->stats;
+ struct can_frame *cf;
+ struct sk_buff *skb;
+
+ skb = alloc_can_skb(dev, &cf);
+ if (unlikely(!skb)) {
+ stats->rx_dropped++;
+ return;
+ }
+
+ at91_read_mb(dev, mb, cf);
+ netif_receive_skb(skb);
+
+ stats->rx_packets++;
+ stats->rx_bytes += cf->can_dlc;
+}
+
+/**
+ * at91_poll_rx - read multiple CAN messages from mailboxes
+ * @dev: net device
+ * @quota: max number of pkgs we're allowed to receive
+ *
+ * Theory of Operation:
+ *
+ * 12 of the 16 mailboxes on the chip are reserved for RX. we split
+ * them into 2 groups. The lower group holds 8 and upper 4 mailboxes.
+ *
+ * Like it or not, but the chip always saves a received CAN message
+ * into the first free mailbox it finds (starting with the
+ * lowest). This makes it very difficult to read the messages in the
+ * right order from the chip. This is how we work around that problem:
+ *
+ * The first message goes into mb nr. 0 and issues an interrupt. All
+ * rx ints are disabled in the interrupt handler and a napi poll is
+ * scheduled. We read the mailbox, but do _not_ reenable the mb (to
+ * receive another message).
+ *
+ * lower mbxs upper
+ * ______^______ __^__
+ * / \ / \
+ * +-+-+-+-+-+-+-+-++-+-+-+-+
+ * |x|x|x|x|x|x|x|x|| | | | |
+ * +-+-+-+-+-+-+-+-++-+-+-+-+
+ * 0 0 0 0 0 0 0 0 0 0 1 1 \ mail
+ * 0 1 2 3 4 5 6 7 8 9 0 1 / box
+ *
+ * The variable priv->rx_next points to the next mailbox to read a
+ * message from. As long we're in the lower mailboxes we just read the
+ * mailbox but not reenable it.
+ *
+ * With completion of the last of the lower mailboxes, we reenable the
+ * whole first group, but continue to look for filled mailboxes in the
+ * upper mailboxes. Imagine the second group like overflow mailboxes,
+ * which takes CAN messages if the lower goup is full. While in the
+ * upper group we reenable the mailbox right after reading it. Giving
+ * the chip more room to store messages.
+ *
+ * After finishing we look again in the lower group if we've still
+ * quota.
+ *
+ */
+static int at91_poll_rx(struct net_device *dev, int quota)
+{
+ struct at91_priv *priv = netdev_priv(dev);
+ u32 reg_sr = at91_read(priv, AT91_SR);
+ const unsigned long *addr = (unsigned long *)&reg_sr;
+ unsigned int mb;
+ int received = 0;
+
+ if (priv->rx_next > AT91_MB_RX_LOW_LAST &&
+ reg_sr & AT91_MB_RX_LOW_MASK)
+ dev_info(dev->dev.parent,
+ "order of incoming frames cannot be guaranteed\n");
+
+ again:
+ for (mb = find_next_bit(addr, AT91_MB_RX_NUM, priv->rx_next);
+ mb < AT91_MB_RX_NUM && quota > 0;
+ reg_sr = at91_read(priv, AT91_SR),
+ mb = find_next_bit(addr, AT91_MB_RX_NUM, ++priv->rx_next)) {
+ at91_read_msg(dev, mb);
+
+ /* reactivate mailboxes */
+ if (mb == AT91_MB_RX_LOW_LAST)
+ /* all lower mailboxed, if just finished it */
+ at91_activate_rx_low(priv);
+ else if (mb > AT91_MB_RX_LOW_LAST)
+ /* only the mailbox we read */
+ at91_activate_rx_mb(priv, mb);
+
+ received++;
+ quota--;
+ }
+
+ /* upper group completed, look again in lower */
+ if (priv->rx_next > AT91_MB_RX_LOW_LAST &&
+ quota > 0 && mb >= AT91_MB_RX_NUM) {
+ priv->rx_next = 0;
+ goto again;
+ }
+
+ return received;
+}
+
+static void at91_poll_err_frame(struct net_device *dev,
+ struct can_frame *cf, u32 reg_sr)
+{
+ struct at91_priv *priv = netdev_priv(dev);
+
+ /* CRC error */
+ if (reg_sr & AT91_IRQ_CERR) {
+ dev_dbg(dev->dev.parent, "CERR irq\n");
+ dev->stats.rx_errors++;
+ priv->can.can_stats.bus_error++;
+ cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+ }
+
+ /* Stuffing Error */
+ if (reg_sr & AT91_IRQ_SERR) {
+ dev_dbg(dev->dev.parent, "SERR irq\n");
+ dev->stats.rx_errors++;
+ priv->can.can_stats.bus_error++;
+ cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+ cf->data[2] |= CAN_ERR_PROT_STUFF;
+ }
+
+ /* Acknowledgement Error */
+ if (reg_sr & AT91_IRQ_AERR) {
+ dev_dbg(dev->dev.parent, "AERR irq\n");
+ dev->stats.tx_errors++;
+ cf->can_id |= CAN_ERR_ACK;
+ }
+
+ /* Form error */
+ if (reg_sr & AT91_IRQ_FERR) {
+ dev_dbg(dev->dev.parent, "FERR irq\n");
+ dev->stats.rx_errors++;
+ priv->can.can_stats.bus_error++;
+ cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+ cf->data[2] |= CAN_ERR_PROT_FORM;
+ }
+
+ /* Bit Error */
+ if (reg_sr & AT91_IRQ_BERR) {
+ dev_dbg(dev->dev.parent, "BERR irq\n");
+ dev->stats.tx_errors++;
+ priv->can.can_stats.bus_error++;
+ cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+ cf->data[2] |= CAN_ERR_PROT_BIT;
+ }
+}
+
+static int at91_poll_err(struct net_device *dev, int quota, u32 reg_sr)
+{
+ struct sk_buff *skb;
+ struct can_frame *cf;
+
+ if (quota == 0)
+ return 0;
+
+ skb = alloc_can_err_skb(dev, &cf);
+ if (unlikely(!skb))
+ return 0;
+
+ at91_poll_err_frame(dev, cf, reg_sr);
+ netif_receive_skb(skb);
+
+ dev->last_rx = jiffies;
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += cf->can_dlc;
+
+ return 1;
+}
+
+static int at91_poll(struct napi_struct *napi, int quota)
+{
+ struct net_device *dev = napi->dev;
+ const struct at91_priv *priv = netdev_priv(dev);
+ u32 reg_sr = at91_read(priv, AT91_SR);
+ int work_done = 0;
+
+ if (reg_sr & AT91_IRQ_MB_RX)
+ work_done += at91_poll_rx(dev, quota - work_done);
+
+ /*
+ * The error bits are clear on read,
+ * so use saved value from irq handler.
+ */
+ reg_sr |= priv->reg_sr;
+ if (reg_sr & AT91_IRQ_ERR_FRAME)
+ work_done += at91_poll_err(dev, quota - work_done, reg_sr);
+
+ if (work_done < quota) {
+ /* enable IRQs for frame errors and all mailboxes >= rx_next */
+ u32 reg_ier = AT91_IRQ_ERR_FRAME;
+ reg_ier |= AT91_IRQ_MB_RX & ~AT91_MB_RX_MASK(priv->rx_next);
+
+ napi_complete(napi);
+ at91_write(priv, AT91_IER, reg_ier);
+ }
+
+ return work_done;
+}
+
+/*
+ * theory of operation:
+ *
+ * priv->tx_echo holds the number of the oldest can_frame put for
+ * transmission into the hardware, but not yet ACKed by the CAN tx
+ * complete IRQ.
+ *
+ * We iterate from priv->tx_echo to priv->tx_next and check if the
+ * packet has been transmitted, echo it back to the CAN framework. If
+ * we discover a not yet transmitted package, stop looking for more.
+ *
+ */
+static void at91_irq_tx(struct net_device *dev, u32 reg_sr)
+{
+ struct at91_priv *priv = netdev_priv(dev);
+ u32 reg_msr;
+ unsigned int mb;
+
+ /* masking of reg_sr not needed, already done by at91_irq */
+
+ for (/* nix */; (priv->tx_next - priv->tx_echo) > 0; priv->tx_echo++) {
+ mb = get_tx_echo_mb(priv);
+
+ /* no event in mailbox? */
+ if (!(reg_sr & (1 << mb)))
+ break;
+
+ /* Disable irq for this TX mailbox */
+ at91_write(priv, AT91_IDR, 1 << mb);
+
+ /*
+ * only echo if mailbox signals us a transfer
+ * complete (MSR_MRDY). Otherwise it's a tansfer
+ * abort. "can_bus_off()" takes care about the skbs
+ * parked in the echo queue.
+ */
+ reg_msr = at91_read(priv, AT91_MSR(mb));
+ if (likely(reg_msr & AT91_MSR_MRDY &&
+ ~reg_msr & AT91_MSR_MABT)) {
+ /* _NOTE_: substract AT91_MB_TX_FIRST offset from mb! */
+ can_get_echo_skb(dev, mb - AT91_MB_TX_FIRST);
+ dev->stats.tx_packets++;
+ }
+ }
+
+ /*
+ * restart queue if we don't have a wrap around but restart if
+ * we get a TX int for the last can frame directly before a
+ * wrap around.
+ */
+ if ((priv->tx_next & AT91_NEXT_MASK) != 0 ||
+ (priv->tx_echo & AT91_NEXT_MASK) == 0)
+ netif_wake_queue(dev);
+}
+
+static void at91_irq_err_state(struct net_device *dev,
+ struct can_frame *cf, enum can_state new_state)
+{
+ struct at91_priv *priv = netdev_priv(dev);
+ u32 reg_idr, reg_ier, reg_ecr;
+ u8 tec, rec;
+
+ reg_ecr = at91_read(priv, AT91_ECR);
+ rec = reg_ecr & 0xff;
+ tec = reg_ecr >> 16;
+
+ switch (priv->can.state) {
+ case CAN_STATE_ERROR_ACTIVE:
+ /*
+ * from: ERROR_ACTIVE
+ * to : ERROR_WARNING, ERROR_PASSIVE, BUS_OFF
+ * => : there was a warning int
+ */
+ if (new_state >= CAN_STATE_ERROR_WARNING &&
+ new_state <= CAN_STATE_BUS_OFF) {
+ dev_dbg(dev->dev.parent, "Error Warning IRQ\n");
+ priv->can.can_stats.error_warning++;
+
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] = (tec > rec) ?
+ CAN_ERR_CRTL_TX_WARNING :
+ CAN_ERR_CRTL_RX_WARNING;
+ }
+ case CAN_STATE_ERROR_WARNING: /* fallthrough */
+ /*
+ * from: ERROR_ACTIVE, ERROR_WARNING
+ * to : ERROR_PASSIVE, BUS_OFF
+ * => : error passive int
+ */
+ if (new_state >= CAN_STATE_ERROR_PASSIVE &&
+ new_state <= CAN_STATE_BUS_OFF) {
+ dev_dbg(dev->dev.parent, "Error Passive IRQ\n");
+ priv->can.can_stats.error_passive++;
+
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] = (tec > rec) ?
+ CAN_ERR_CRTL_TX_PASSIVE :
+ CAN_ERR_CRTL_RX_PASSIVE;
+ }
+ break;
+ case CAN_STATE_BUS_OFF:
+ /*
+ * from: BUS_OFF
+ * to : ERROR_ACTIVE, ERROR_WARNING, ERROR_PASSIVE
+ */
+ if (new_state <= CAN_STATE_ERROR_PASSIVE) {
+ cf->can_id |= CAN_ERR_RESTARTED;
+
+ dev_dbg(dev->dev.parent, "restarted\n");
+ priv->can.can_stats.restarts++;
+
+ netif_carrier_on(dev);
+ netif_wake_queue(dev);
+ }
+ break;
+ default:
+ break;
+ }
+
+
+ /* process state changes depending on the new state */
+ switch (new_state) {
+ case CAN_STATE_ERROR_ACTIVE:
+ /*
+ * actually we want to enable AT91_IRQ_WARN here, but
+ * it screws up the system under certain
+ * circumstances. so just enable AT91_IRQ_ERRP, thus
+ * the "fallthrough"
+ */
+ dev_dbg(dev->dev.parent, "Error Active\n");
+ cf->can_id |= CAN_ERR_PROT;
+ cf->data[2] = CAN_ERR_PROT_ACTIVE;
+ case CAN_STATE_ERROR_WARNING: /* fallthrough */
+ reg_idr = AT91_IRQ_ERRA | AT91_IRQ_WARN | AT91_IRQ_BOFF;
+ reg_ier = AT91_IRQ_ERRP;
+ break;
+ case CAN_STATE_ERROR_PASSIVE:
+ reg_idr = AT91_IRQ_ERRA | AT91_IRQ_WARN | AT91_IRQ_ERRP;
+ reg_ier = AT91_IRQ_BOFF;
+ break;
+ case CAN_STATE_BUS_OFF:
+ reg_idr = AT91_IRQ_ERRA | AT91_IRQ_ERRP |
+ AT91_IRQ_WARN | AT91_IRQ_BOFF;
+ reg_ier = 0;
+
+ cf->can_id |= CAN_ERR_BUSOFF;
+
+ dev_dbg(dev->dev.parent, "bus-off\n");
+ netif_carrier_off(dev);
+ priv->can.can_stats.bus_off++;
+
+ /* turn off chip, if restart is disabled */
+ if (!priv->can.restart_ms) {
+ at91_chip_stop(dev, CAN_STATE_BUS_OFF);
+ return;
+ }
+ break;
+ default:
+ break;
+ }
+
+ at91_write(priv, AT91_IDR, reg_idr);
+ at91_write(priv, AT91_IER, reg_ier);
+}
+
+static void at91_irq_err(struct net_device *dev)
+{
+ struct at91_priv *priv = netdev_priv(dev);
+ struct sk_buff *skb;
+ struct can_frame *cf;
+ enum can_state new_state;
+ u32 reg_sr;
+
+ reg_sr = at91_read(priv, AT91_SR);
+
+ /* we need to look at the unmasked reg_sr */
+ if (unlikely(reg_sr & AT91_IRQ_BOFF))
+ new_state = CAN_STATE_BUS_OFF;
+ else if (unlikely(reg_sr & AT91_IRQ_ERRP))
+ new_state = CAN_STATE_ERROR_PASSIVE;
+ else if (unlikely(reg_sr & AT91_IRQ_WARN))
+ new_state = CAN_STATE_ERROR_WARNING;
+ else if (likely(reg_sr & AT91_IRQ_ERRA))
+ new_state = CAN_STATE_ERROR_ACTIVE;
+ else {
+ dev_err(dev->dev.parent, "BUG! hardware in undefined state\n");
+ return;
+ }
+
+ /* state hasn't changed */
+ if (likely(new_state == priv->can.state))
+ return;
+
+ skb = alloc_can_err_skb(dev, &cf);
+ if (unlikely(!skb))
+ return;
+
+ at91_irq_err_state(dev, cf, new_state);
+ netif_rx(skb);
+
+ dev->last_rx = jiffies;
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += cf->can_dlc;
+
+ priv->can.state = new_state;
+}
+
+/*
+ * interrupt handler
+ */
+static irqreturn_t at91_irq(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct at91_priv *priv = netdev_priv(dev);
+ irqreturn_t handled = IRQ_NONE;
+ u32 reg_sr, reg_imr;
+
+ reg_sr = at91_read(priv, AT91_SR);
+ reg_imr = at91_read(priv, AT91_IMR);
+
+ /* Ignore masked interrupts */
+ reg_sr &= reg_imr;
+ if (!reg_sr)
+ goto exit;
+
+ handled = IRQ_HANDLED;
+
+ /* Receive or error interrupt? -> napi */
+ if (reg_sr & (AT91_IRQ_MB_RX | AT91_IRQ_ERR_FRAME)) {
+ /*
+ * The error bits are clear on read,
+ * save for later use.
+ */
+ priv->reg_sr = reg_sr;
+ at91_write(priv, AT91_IDR,
+ AT91_IRQ_MB_RX | AT91_IRQ_ERR_FRAME);
+ napi_schedule(&priv->napi);
+ }
+
+ /* Transmission complete interrupt */
+ if (reg_sr & AT91_IRQ_MB_TX)
+ at91_irq_tx(dev, reg_sr);
+
+ at91_irq_err(dev);
+
+ exit:
+ return handled;
+}
+
+static int at91_open(struct net_device *dev)
+{
+ struct at91_priv *priv = netdev_priv(dev);
+ int err;
+
+ clk_enable(priv->clk);
+
+ /* check or determine and set bittime */
+ err = open_candev(dev);
+ if (err)
+ goto out;
+
+ /* register interrupt handler */
+ if (request_irq(dev->irq, at91_irq, IRQF_SHARED,
+ dev->name, dev)) {
+ err = -EAGAIN;
+ goto out_close;
+ }
+
+ /* start chip and queuing */
+ at91_chip_start(dev);
+ napi_enable(&priv->napi);
+ netif_start_queue(dev);
+
+ return 0;
+
+ out_close:
+ close_candev(dev);
+ out:
+ clk_disable(priv->clk);
+
+ return err;
+}
+
+/*
+ * stop CAN bus activity
+ */
+static int at91_close(struct net_device *dev)
+{
+ struct at91_priv *priv = netdev_priv(dev);
+
+ netif_stop_queue(dev);
+ napi_disable(&priv->napi);
+ at91_chip_stop(dev, CAN_STATE_STOPPED);
+
+ free_irq(dev->irq, dev);
+ clk_disable(priv->clk);
+
+ close_candev(dev);
+
+ return 0;
+}
+
+static int at91_set_mode(struct net_device *dev, enum can_mode mode)
+{
+ switch (mode) {
+ case CAN_MODE_START:
+ at91_chip_start(dev);
+ netif_wake_queue(dev);
+ break;
+
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
+static const struct net_device_ops at91_netdev_ops = {
+ .ndo_open = at91_open,
+ .ndo_stop = at91_close,
+ .ndo_start_xmit = at91_start_xmit,
+};
+
+static int __init at91_can_probe(struct platform_device *pdev)
+{
+ struct net_device *dev;
+ struct at91_priv *priv;
+ struct resource *res;
+ struct clk *clk;
+ void __iomem *addr;
+ int err, irq;
+
+ clk = clk_get(&pdev->dev, "can_clk");
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "no clock defined\n");
+ err = -ENODEV;
+ goto exit;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ irq = platform_get_irq(pdev, 0);
+ if (!res || !irq) {
+ err = -ENODEV;
+ goto exit_put;
+ }
+
+ if (!request_mem_region(res->start,
+ resource_size(res),
+ pdev->name)) {
+ err = -EBUSY;
+ goto exit_put;
+ }
+
+ addr = ioremap_nocache(res->start, resource_size(res));
+ if (!addr) {
+ err = -ENOMEM;
+ goto exit_release;
+ }
+
+ dev = alloc_candev(sizeof(struct at91_priv));
+ if (!dev) {
+ err = -ENOMEM;
+ goto exit_iounmap;
+ }
+
+ dev->netdev_ops = &at91_netdev_ops;
+ dev->irq = irq;
+ dev->flags |= IFF_ECHO;
+
+ priv = netdev_priv(dev);
+ priv->can.clock.freq = clk_get_rate(clk);
+ priv->can.bittiming_const = &at91_bittiming_const;
+ priv->can.do_set_bittiming = at91_set_bittiming;
+ priv->can.do_set_mode = at91_set_mode;
+ priv->reg_base = addr;
+ priv->dev = dev;
+ priv->clk = clk;
+ priv->pdata = pdev->dev.platform_data;
+
+ netif_napi_add(dev, &priv->napi, at91_poll, AT91_NAPI_WEIGHT);
+
+ dev_set_drvdata(&pdev->dev, dev);
+ SET_NETDEV_DEV(dev, &pdev->dev);
+
+ err = register_candev(dev);
+ if (err) {
+ dev_err(&pdev->dev, "registering netdev failed\n");
+ goto exit_free;
+ }
+
+ dev_info(&pdev->dev, "device registered (reg_base=%p, irq=%d)\n",
+ priv->reg_base, dev->irq);
+
+ return 0;
+
+ exit_free:
+ free_netdev(dev);
+ exit_iounmap:
+ iounmap(addr);
+ exit_release:
+ release_mem_region(res->start, resource_size(res));
+ exit_put:
+ clk_put(clk);
+ exit:
+ return err;
+}
+
+static int __devexit at91_can_remove(struct platform_device *pdev)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ struct at91_priv *priv = netdev_priv(dev);
+ struct resource *res;
+
+ unregister_netdev(dev);
+
+ platform_set_drvdata(pdev, NULL);
+
+ free_netdev(dev);
+
+ iounmap(priv->reg_base);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(res->start, resource_size(res));
+
+ clk_put(priv->clk);
+
+ return 0;
+}
+
+static struct platform_driver at91_can_driver = {
+ .probe = at91_can_probe,
+ .remove = __devexit_p(at91_can_remove),
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init at91_can_module_init(void)
+{
+ printk(KERN_INFO "%s netdevice driver\n", DRV_NAME);
+ return platform_driver_register(&at91_can_driver);
+}
+
+static void __exit at91_can_module_exit(void)
+{
+ platform_driver_unregister(&at91_can_driver);
+ printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
+}
+
+module_init(at91_can_module_init);
+module_exit(at91_can_module_exit);
+
+MODULE_AUTHOR("Marc Kleine-Budde <mkl@pengutronix.de>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION(DRV_NAME " CAN netdevice driver");
diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
index d465eaa796c4..65a2d0ba64e2 100644
--- a/drivers/net/davinci_emac.c
+++ b/drivers/net/davinci_emac.c
@@ -200,6 +200,9 @@ static const char emac_version_string[] = "TI DaVinci EMAC Linux v6.1";
/** NOTE:: For DM646x the IN_VECTOR has changed */
#define EMAC_DM646X_MAC_IN_VECTOR_RX_INT_VEC BIT(EMAC_DEF_RX_CH)
#define EMAC_DM646X_MAC_IN_VECTOR_TX_INT_VEC BIT(16 + EMAC_DEF_TX_CH)
+#define EMAC_DM646X_MAC_IN_VECTOR_HOST_INT BIT(26)
+#define EMAC_DM646X_MAC_IN_VECTOR_STATPEND_INT BIT(27)
+
/* CPPI bit positions */
#define EMAC_CPPI_SOP_BIT BIT(31)
@@ -2167,7 +2170,11 @@ static int emac_poll(struct napi_struct *napi, int budget)
emac_int_enable(priv);
}
- if (unlikely(status & EMAC_DM644X_MAC_IN_VECTOR_HOST_INT)) {
+ mask = EMAC_DM644X_MAC_IN_VECTOR_HOST_INT;
+ if (priv->version == EMAC_VERSION_2)
+ mask = EMAC_DM646X_MAC_IN_VECTOR_HOST_INT;
+
+ if (unlikely(status & mask)) {
u32 ch, cause;
dev_err(emac_dev, "DaVinci EMAC: Fatal Hardware Error\n");
netif_stop_queue(ndev);
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 5c498d2b043f..d445845f2779 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1,4 +1,4 @@
-/* A simple network driver using virtio.
+/* A network driver using virtio.
*
* Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
*
@@ -48,19 +48,9 @@ struct virtnet_info
struct napi_struct napi;
unsigned int status;
- /* The skb we couldn't send because buffers were full. */
- struct sk_buff *last_xmit_skb;
-
- /* If we need to free in a timer, this is it. */
- struct timer_list xmit_free_timer;
-
/* Number of input buffers, and max we've ever had. */
unsigned int num, max;
- /* For cleaning up after transmission. */
- struct tasklet_struct tasklet;
- bool free_in_tasklet;
-
/* I like... big packets and I cannot lie! */
bool big_packets;
@@ -78,9 +68,17 @@ struct virtnet_info
struct page *pages;
};
-static inline void *skb_vnet_hdr(struct sk_buff *skb)
+struct skb_vnet_hdr {
+ union {
+ struct virtio_net_hdr hdr;
+ struct virtio_net_hdr_mrg_rxbuf mhdr;
+ };
+ unsigned int num_sg;
+};
+
+static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
{
- return (struct virtio_net_hdr *)skb->cb;
+ return (struct skb_vnet_hdr *)skb->cb;
}
static void give_a_page(struct virtnet_info *vi, struct page *page)
@@ -119,17 +117,13 @@ static void skb_xmit_done(struct virtqueue *svq)
/* We were probably waiting for more output buffers. */
netif_wake_queue(vi->dev);
-
- /* Make sure we re-xmit last_xmit_skb: if there are no more packets
- * queued, start_xmit won't be called. */
- tasklet_schedule(&vi->tasklet);
}
static void receive_skb(struct net_device *dev, struct sk_buff *skb,
unsigned len)
{
struct virtnet_info *vi = netdev_priv(dev);
- struct virtio_net_hdr *hdr = skb_vnet_hdr(skb);
+ struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
int err;
int i;
@@ -140,7 +134,6 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
}
if (vi->mergeable_rx_bufs) {
- struct virtio_net_hdr_mrg_rxbuf *mhdr = skb_vnet_hdr(skb);
unsigned int copy;
char *p = page_address(skb_shinfo(skb)->frags[0].page);
@@ -148,8 +141,8 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
len = PAGE_SIZE;
len -= sizeof(struct virtio_net_hdr_mrg_rxbuf);
- memcpy(hdr, p, sizeof(*mhdr));
- p += sizeof(*mhdr);
+ memcpy(&hdr->mhdr, p, sizeof(hdr->mhdr));
+ p += sizeof(hdr->mhdr);
copy = len;
if (copy > skb_tailroom(skb))
@@ -164,13 +157,13 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
skb_shinfo(skb)->nr_frags--;
} else {
skb_shinfo(skb)->frags[0].page_offset +=
- sizeof(*mhdr) + copy;
+ sizeof(hdr->mhdr) + copy;
skb_shinfo(skb)->frags[0].size = len;
skb->data_len += len;
skb->len += len;
}
- while (--mhdr->num_buffers) {
+ while (--hdr->mhdr.num_buffers) {
struct sk_buff *nskb;
i = skb_shinfo(skb)->nr_frags;
@@ -184,7 +177,7 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
nskb = vi->rvq->vq_ops->get_buf(vi->rvq, &len);
if (!nskb) {
pr_debug("%s: rx error: %d buffers missing\n",
- dev->name, mhdr->num_buffers);
+ dev->name, hdr->mhdr.num_buffers);
dev->stats.rx_length_errors++;
goto drop;
}
@@ -205,7 +198,7 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
skb->len += len;
}
} else {
- len -= sizeof(struct virtio_net_hdr);
+ len -= sizeof(hdr->hdr);
if (len <= MAX_PACKET_LEN)
trim_pages(vi, skb);
@@ -223,9 +216,11 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
dev->stats.rx_bytes += skb->len;
dev->stats.rx_packets++;
- if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
+ if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
pr_debug("Needs csum!\n");
- if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset))
+ if (!skb_partial_csum_set(skb,
+ hdr->hdr.csum_start,
+ hdr->hdr.csum_offset))
goto frame_err;
}
@@ -233,9 +228,9 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
ntohs(skb->protocol), skb->len, skb->pkt_type);
- if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
+ if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
pr_debug("GSO!\n");
- switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
+ switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
case VIRTIO_NET_HDR_GSO_TCPV4:
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
break;
@@ -248,14 +243,14 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
default:
if (net_ratelimit())
printk(KERN_WARNING "%s: bad gso type %u.\n",
- dev->name, hdr->gso_type);
+ dev->name, hdr->hdr.gso_type);
goto frame_err;
}
- if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
+ if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
- skb_shinfo(skb)->gso_size = hdr->gso_size;
+ skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
if (skb_shinfo(skb)->gso_size == 0) {
if (net_ratelimit())
printk(KERN_WARNING "%s: zero gso size.\n",
@@ -285,8 +280,8 @@ static bool try_fill_recv_maxbufs(struct virtnet_info *vi, gfp_t gfp)
bool oom = false;
sg_init_table(sg, 2+MAX_SKB_FRAGS);
- for (;;) {
- struct virtio_net_hdr *hdr;
+ do {
+ struct skb_vnet_hdr *hdr;
skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN + NET_IP_ALIGN);
if (unlikely(!skb)) {
@@ -298,7 +293,7 @@ static bool try_fill_recv_maxbufs(struct virtnet_info *vi, gfp_t gfp)
skb_put(skb, MAX_PACKET_LEN);
hdr = skb_vnet_hdr(skb);
- sg_set_buf(sg, hdr, sizeof(*hdr));
+ sg_set_buf(sg, &hdr->hdr, sizeof(hdr->hdr));
if (vi->big_packets) {
for (i = 0; i < MAX_SKB_FRAGS; i++) {
@@ -328,7 +323,7 @@ static bool try_fill_recv_maxbufs(struct virtnet_info *vi, gfp_t gfp)
break;
}
vi->num++;
- }
+ } while (err >= num);
if (unlikely(vi->num > vi->max))
vi->max = vi->num;
vi->rvq->vq_ops->kick(vi->rvq);
@@ -346,7 +341,7 @@ static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
if (!vi->mergeable_rx_bufs)
return try_fill_recv_maxbufs(vi, gfp);
- for (;;) {
+ do {
skb_frag_t *f;
skb = netdev_alloc_skb(vi->dev, GOOD_COPY_LEN + NET_IP_ALIGN);
@@ -380,7 +375,7 @@ static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
break;
}
vi->num++;
- }
+ } while (err > 0);
if (unlikely(vi->num > vi->max))
vi->max = vi->num;
vi->rvq->vq_ops->kick(vi->rvq);
@@ -448,42 +443,26 @@ again:
return received;
}
-static void free_old_xmit_skbs(struct virtnet_info *vi)
+static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
{
struct sk_buff *skb;
- unsigned int len;
+ unsigned int len, tot_sgs = 0;
while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) {
pr_debug("Sent skb %p\n", skb);
__skb_unlink(skb, &vi->send);
vi->dev->stats.tx_bytes += skb->len;
vi->dev->stats.tx_packets++;
+ tot_sgs += skb_vnet_hdr(skb)->num_sg;
kfree_skb(skb);
}
-}
-
-/* If the virtio transport doesn't always notify us when all in-flight packets
- * are consumed, we fall back to using this function on a timer to free them. */
-static void xmit_free(unsigned long data)
-{
- struct virtnet_info *vi = (void *)data;
-
- netif_tx_lock(vi->dev);
-
- free_old_xmit_skbs(vi);
-
- if (!skb_queue_empty(&vi->send))
- mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10));
-
- netif_tx_unlock(vi->dev);
+ return tot_sgs;
}
static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
{
- int num, err;
struct scatterlist sg[2+MAX_SKB_FRAGS];
- struct virtio_net_hdr_mrg_rxbuf *mhdr = skb_vnet_hdr(skb);
- struct virtio_net_hdr *hdr = skb_vnet_hdr(skb);
+ struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
sg_init_table(sg, 2+MAX_SKB_FRAGS);
@@ -491,108 +470,89 @@ static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
if (skb->ip_summed == CHECKSUM_PARTIAL) {
- hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
- hdr->csum_start = skb->csum_start - skb_headroom(skb);
- hdr->csum_offset = skb->csum_offset;
+ hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ hdr->hdr.csum_start = skb->csum_start - skb_headroom(skb);
+ hdr->hdr.csum_offset = skb->csum_offset;
} else {
- hdr->flags = 0;
- hdr->csum_offset = hdr->csum_start = 0;
+ hdr->hdr.flags = 0;
+ hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
}
if (skb_is_gso(skb)) {
- hdr->hdr_len = skb_headlen(skb);
- hdr->gso_size = skb_shinfo(skb)->gso_size;
+ hdr->hdr.hdr_len = skb_headlen(skb);
+ hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
- hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
+ hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
- hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
+ hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
- hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
+ hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
else
BUG();
if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
- hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
+ hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
} else {
- hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
- hdr->gso_size = hdr->hdr_len = 0;
+ hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
+ hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
}
- mhdr->num_buffers = 0;
+ hdr->mhdr.num_buffers = 0;
/* Encode metadata header at front. */
if (vi->mergeable_rx_bufs)
- sg_set_buf(sg, mhdr, sizeof(*mhdr));
+ sg_set_buf(sg, &hdr->mhdr, sizeof(hdr->mhdr));
else
- sg_set_buf(sg, hdr, sizeof(*hdr));
+ sg_set_buf(sg, &hdr->hdr, sizeof(hdr->hdr));
- num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
-
- err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb);
- if (err >= 0 && !vi->free_in_tasklet)
- mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10));
-
- return err;
-}
-
-static void xmit_tasklet(unsigned long data)
-{
- struct virtnet_info *vi = (void *)data;
-
- netif_tx_lock_bh(vi->dev);
- if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) >= 0) {
- vi->svq->vq_ops->kick(vi->svq);
- vi->last_xmit_skb = NULL;
- }
- if (vi->free_in_tasklet)
- free_old_xmit_skbs(vi);
- netif_tx_unlock_bh(vi->dev);
+ hdr->num_sg = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
+ return vi->svq->vq_ops->add_buf(vi->svq, sg, hdr->num_sg, 0, skb);
}
static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct virtnet_info *vi = netdev_priv(dev);
+ int capacity;
again:
/* Free up any pending old buffers before queueing new ones. */
free_old_xmit_skbs(vi);
- /* If we has a buffer left over from last time, send it now. */
- if (unlikely(vi->last_xmit_skb) &&
- xmit_skb(vi, vi->last_xmit_skb) < 0)
- goto stop_queue;
-
- vi->last_xmit_skb = NULL;
-
/* Put new one in send queue and do transmit */
- if (likely(skb)) {
- __skb_queue_head(&vi->send, skb);
- if (xmit_skb(vi, skb) < 0) {
- vi->last_xmit_skb = skb;
- skb = NULL;
- goto stop_queue;
+ __skb_queue_head(&vi->send, skb);
+ capacity = xmit_skb(vi, skb);
+
+ /* This can happen with OOM and indirect buffers. */
+ if (unlikely(capacity < 0)) {
+ netif_stop_queue(dev);
+ dev_warn(&dev->dev, "Unexpected full queue\n");
+ if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
+ vi->svq->vq_ops->disable_cb(vi->svq);
+ netif_start_queue(dev);
+ goto again;
}
+ return NETDEV_TX_BUSY;
}
-done:
- vi->svq->vq_ops->kick(vi->svq);
- return NETDEV_TX_OK;
-stop_queue:
- pr_debug("%s: virtio not prepared to send\n", dev->name);
- netif_stop_queue(dev);
-
- /* Activate callback for using skbs: if this returns false it
- * means some were used in the meantime. */
- if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
- vi->svq->vq_ops->disable_cb(vi->svq);
- netif_start_queue(dev);
- goto again;
- }
- if (skb) {
- /* Drop this skb: we only queue one. */
- vi->dev->stats.tx_dropped++;
- kfree_skb(skb);
+ vi->svq->vq_ops->kick(vi->svq);
+ /* Don't wait up for transmitted skbs to be freed. */
+ skb_orphan(skb);
+ nf_reset(skb);
+
+ /* Apparently nice girls don't return TX_BUSY; stop the queue
+ * before it gets out of hand. Naturally, this wastes entries. */
+ if (capacity < 2+MAX_SKB_FRAGS) {
+ netif_stop_queue(dev);
+ if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
+ /* More just got used, free them then recheck. */
+ capacity += free_old_xmit_skbs(vi);
+ if (capacity >= 2+MAX_SKB_FRAGS) {
+ netif_start_queue(dev);
+ vi->svq->vq_ops->disable_cb(vi->svq);
+ }
+ }
}
- goto done;
+
+ return NETDEV_TX_OK;
}
static int virtnet_set_mac_address(struct net_device *dev, void *p)
@@ -925,10 +885,6 @@ static int virtnet_probe(struct virtio_device *vdev)
vi->pages = NULL;
INIT_DELAYED_WORK(&vi->refill, refill_work);
- /* If they give us a callback when all buffers are done, we don't need
- * the timer. */
- vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY);
-
/* If we can receive ANY GSO packets, we must allocate large ones. */
if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4)
|| virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)
@@ -960,11 +916,6 @@ static int virtnet_probe(struct virtio_device *vdev)
skb_queue_head_init(&vi->recv);
skb_queue_head_init(&vi->send);
- tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi);
-
- if (!vi->free_in_tasklet)
- setup_timer(&vi->xmit_free_timer, xmit_free, (unsigned long)vi);
-
err = register_netdev(dev);
if (err) {
pr_debug("virtio_net: registering device failed\n");
@@ -1005,9 +956,6 @@ static void virtnet_remove(struct virtio_device *vdev)
/* Stop all the virtqueues. */
vdev->config->reset(vdev);
- if (!vi->free_in_tasklet)
- del_timer_sync(&vi->xmit_free_timer);
-
/* Free our skbs in send and recv queues, if any. */
while ((skb = __skb_dequeue(&vi->recv)) != NULL) {
kfree_skb(skb);
@@ -1041,7 +989,6 @@ static unsigned int features[] = {
VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
- VIRTIO_F_NOTIFY_ON_EMPTY,
};
static struct virtio_driver virtio_net = {
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-16 11:59:04 +0000