diff options
Diffstat (limited to 'drivers/net/can')
| -rw-r--r-- | drivers/net/can/cc770/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/net/can/dev/dev.c | 2 | ||||
| -rw-r--r-- | drivers/net/can/sja1000/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 14 | ||||
| -rw-r--r-- | drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c | 2 | ||||
| -rw-r--r-- | drivers/net/can/spi/mcp251xfd/mcp251xfd-tef.c | 125 | ||||
| -rw-r--r-- | drivers/net/can/spi/mcp251xfd/mcp251xfd-tx.c | 55 | ||||
| -rw-r--r-- | drivers/net/can/spi/mcp251xfd/mcp251xfd.h | 18 | ||||
| -rw-r--r-- | drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c | 3 | ||||
| -rw-r--r-- | drivers/net/can/vcan.c | 2 | ||||
| -rw-r--r-- | drivers/net/can/vxcan.c | 2 |
11 files changed, 142 insertions, 83 deletions
diff --git a/drivers/net/can/cc770/Kconfig b/drivers/net/can/cc770/Kconfig index 9ef1359319..467ef19de1 100644 --- a/drivers/net/can/cc770/Kconfig +++ b/drivers/net/can/cc770/Kconfig @@ -7,6 +7,7 @@ if CAN_CC770 config CAN_CC770_ISA tristate "ISA Bus based legacy CC770 driver" + depends on ISA help This driver adds legacy support for CC770 and AN82527 chips connected to the ISA bus using I/O port, memory mapped or diff --git a/drivers/net/can/dev/dev.c b/drivers/net/can/dev/dev.c index 3a3be5cdfc..83e724e0ab 100644 --- a/drivers/net/can/dev/dev.c +++ b/drivers/net/can/dev/dev.c @@ -338,7 +338,7 @@ int can_change_mtu(struct net_device *dev, int new_mtu) return -EINVAL; } - dev->mtu = new_mtu; + WRITE_ONCE(dev->mtu, new_mtu); return 0; } EXPORT_SYMBOL_GPL(can_change_mtu); diff --git a/drivers/net/can/sja1000/Kconfig b/drivers/net/can/sja1000/Kconfig index 4b2f9cb17f..01168db4c1 100644 --- a/drivers/net/can/sja1000/Kconfig +++ b/drivers/net/can/sja1000/Kconfig @@ -87,6 +87,7 @@ config CAN_PLX_PCI config CAN_SJA1000_ISA tristate "ISA Bus based legacy SJA1000 driver" + depends on ISA help This driver adds legacy support for SJA1000 chips connected to the ISA bus using I/O port, memory mapped or indirect access. diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c index 1d9057dc44..bf1589aef1 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c @@ -1618,11 +1618,20 @@ static int mcp251xfd_open(struct net_device *ndev) clear_bit(MCP251XFD_FLAGS_DOWN, priv->flags); can_rx_offload_enable(&priv->offload); + priv->wq = alloc_ordered_workqueue("%s-mcp251xfd_wq", + WQ_FREEZABLE | WQ_MEM_RECLAIM, + dev_name(&spi->dev)); + if (!priv->wq) { + err = -ENOMEM; + goto out_can_rx_offload_disable; + } + INIT_WORK(&priv->tx_work, mcp251xfd_tx_obj_write_sync); + err = request_threaded_irq(spi->irq, NULL, mcp251xfd_irq, IRQF_SHARED | IRQF_ONESHOT, dev_name(&spi->dev), priv); if (err) - goto out_can_rx_offload_disable; + goto out_destroy_workqueue; err = mcp251xfd_chip_interrupts_enable(priv); if (err) @@ -1634,6 +1643,8 @@ static int mcp251xfd_open(struct net_device *ndev) out_free_irq: free_irq(spi->irq, priv); + out_destroy_workqueue: + destroy_workqueue(priv->wq); out_can_rx_offload_disable: can_rx_offload_disable(&priv->offload); set_bit(MCP251XFD_FLAGS_DOWN, priv->flags); @@ -1661,6 +1672,7 @@ static int mcp251xfd_stop(struct net_device *ndev) hrtimer_cancel(&priv->tx_irq_timer); mcp251xfd_chip_interrupts_disable(priv); free_irq(ndev->irq, priv); + destroy_workqueue(priv->wq); can_rx_offload_disable(&priv->offload); mcp251xfd_timestamp_stop(priv); mcp251xfd_chip_stop(priv, CAN_STATE_STOPPED); diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c index bfe4caa0c9..4cb79a4f24 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c @@ -485,6 +485,8 @@ int mcp251xfd_ring_alloc(struct mcp251xfd_priv *priv) clear_bit(MCP251XFD_FLAGS_FD_MODE, priv->flags); } + tx_ring->obj_num_shift_to_u8 = BITS_PER_TYPE(tx_ring->obj_num) - + ilog2(tx_ring->obj_num); tx_ring->obj_size = tx_obj_size; rem = priv->rx_obj_num; diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-tef.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-tef.c index e5bd57b65a..5b0c7890d4 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-tef.c +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-tef.c @@ -2,7 +2,7 @@ // // mcp251xfd - Microchip MCP251xFD Family CAN controller driver // -// Copyright (c) 2019, 2020, 2021 Pengutronix, +// Copyright (c) 2019, 2020, 2021, 2023 Pengutronix, // Marc Kleine-Budde <kernel@pengutronix.de> // // Based on: @@ -16,6 +16,11 @@ #include "mcp251xfd.h" +static inline bool mcp251xfd_tx_fifo_sta_full(u32 fifo_sta) +{ + return !(fifo_sta & MCP251XFD_REG_FIFOSTA_TFNRFNIF); +} + static inline int mcp251xfd_tef_tail_get_from_chip(const struct mcp251xfd_priv *priv, u8 *tef_tail) @@ -56,55 +61,38 @@ static int mcp251xfd_check_tef_tail(const struct mcp251xfd_priv *priv) } static int -mcp251xfd_handle_tefif_recover(const struct mcp251xfd_priv *priv, const u32 seq) -{ - const struct mcp251xfd_tx_ring *tx_ring = priv->tx; - u32 tef_sta; - int err; - - err = regmap_read(priv->map_reg, MCP251XFD_REG_TEFSTA, &tef_sta); - if (err) - return err; - - if (tef_sta & MCP251XFD_REG_TEFSTA_TEFOVIF) { - netdev_err(priv->ndev, - "Transmit Event FIFO buffer overflow.\n"); - return -ENOBUFS; - } - - netdev_info(priv->ndev, - "Transmit Event FIFO buffer %s. (seq=0x%08x, tef_tail=0x%08x, tef_head=0x%08x, tx_head=0x%08x).\n", - tef_sta & MCP251XFD_REG_TEFSTA_TEFFIF ? - "full" : tef_sta & MCP251XFD_REG_TEFSTA_TEFNEIF ? - "not empty" : "empty", - seq, priv->tef->tail, priv->tef->head, tx_ring->head); - - /* The Sequence Number in the TEF doesn't match our tef_tail. */ - return -EAGAIN; -} - -static int mcp251xfd_handle_tefif_one(struct mcp251xfd_priv *priv, const struct mcp251xfd_hw_tef_obj *hw_tef_obj, unsigned int *frame_len_ptr) { struct net_device_stats *stats = &priv->ndev->stats; + u32 seq, tef_tail_masked, tef_tail; struct sk_buff *skb; - u32 seq, seq_masked, tef_tail_masked, tef_tail; - seq = FIELD_GET(MCP251XFD_OBJ_FLAGS_SEQ_MCP2518FD_MASK, + /* Use the MCP2517FD mask on the MCP2518FD, too. We only + * compare 7 bits, this is enough to detect old TEF objects. + */ + seq = FIELD_GET(MCP251XFD_OBJ_FLAGS_SEQ_MCP2517FD_MASK, hw_tef_obj->flags); - - /* Use the MCP2517FD mask on the MCP2518FD, too. We only - * compare 7 bits, this should be enough to detect - * net-yet-completed, i.e. old TEF objects. - */ - seq_masked = seq & - field_mask(MCP251XFD_OBJ_FLAGS_SEQ_MCP2517FD_MASK); tef_tail_masked = priv->tef->tail & field_mask(MCP251XFD_OBJ_FLAGS_SEQ_MCP2517FD_MASK); - if (seq_masked != tef_tail_masked) - return mcp251xfd_handle_tefif_recover(priv, seq); + + /* According to mcp2518fd erratum DS80000789E 6. the FIFOCI + * bits of a FIFOSTA register, here the TX FIFO tail index + * might be corrupted and we might process past the TEF FIFO's + * head into old CAN frames. + * + * Compare the sequence number of the currently processed CAN + * frame with the expected sequence number. Abort with + * -EBADMSG if an old CAN frame is detected. + */ + if (seq != tef_tail_masked) { + netdev_dbg(priv->ndev, "%s: chip=0x%02x ring=0x%02x\n", __func__, + seq, tef_tail_masked); + stats->tx_fifo_errors++; + + return -EBADMSG; + } tef_tail = mcp251xfd_get_tef_tail(priv); skb = priv->can.echo_skb[tef_tail]; @@ -120,28 +108,44 @@ mcp251xfd_handle_tefif_one(struct mcp251xfd_priv *priv, return 0; } -static int mcp251xfd_tef_ring_update(struct mcp251xfd_priv *priv) +static int +mcp251xfd_get_tef_len(struct mcp251xfd_priv *priv, u8 *len_p) { const struct mcp251xfd_tx_ring *tx_ring = priv->tx; - unsigned int new_head; - u8 chip_tx_tail; + const u8 shift = tx_ring->obj_num_shift_to_u8; + u8 chip_tx_tail, tail, len; + u32 fifo_sta; int err; - err = mcp251xfd_tx_tail_get_from_chip(priv, &chip_tx_tail); + err = regmap_read(priv->map_reg, MCP251XFD_REG_FIFOSTA(priv->tx->fifo_nr), + &fifo_sta); if (err) return err; - /* chip_tx_tail, is the next TX-Object send by the HW. - * The new TEF head must be >= the old head, ... + if (mcp251xfd_tx_fifo_sta_full(fifo_sta)) { + *len_p = tx_ring->obj_num; + return 0; + } + + chip_tx_tail = FIELD_GET(MCP251XFD_REG_FIFOSTA_FIFOCI_MASK, fifo_sta); + + err = mcp251xfd_check_tef_tail(priv); + if (err) + return err; + tail = mcp251xfd_get_tef_tail(priv); + + /* First shift to full u8. The subtraction works on signed + * values, that keeps the difference steady around the u8 + * overflow. The right shift acts on len, which is an u8. */ - new_head = round_down(priv->tef->head, tx_ring->obj_num) + chip_tx_tail; - if (new_head <= priv->tef->head) - new_head += tx_ring->obj_num; + BUILD_BUG_ON(sizeof(tx_ring->obj_num) != sizeof(chip_tx_tail)); + BUILD_BUG_ON(sizeof(tx_ring->obj_num) != sizeof(tail)); + BUILD_BUG_ON(sizeof(tx_ring->obj_num) != sizeof(len)); - /* ... but it cannot exceed the TX head. */ - priv->tef->head = min(new_head, tx_ring->head); + len = (chip_tx_tail << shift) - (tail << shift); + *len_p = len >> shift; - return mcp251xfd_check_tef_tail(priv); + return 0; } static inline int @@ -182,13 +186,12 @@ int mcp251xfd_handle_tefif(struct mcp251xfd_priv *priv) u8 tef_tail, len, l; int err, i; - err = mcp251xfd_tef_ring_update(priv); + err = mcp251xfd_get_tef_len(priv, &len); if (err) return err; tef_tail = mcp251xfd_get_tef_tail(priv); - len = mcp251xfd_get_tef_len(priv); - l = mcp251xfd_get_tef_linear_len(priv); + l = mcp251xfd_get_tef_linear_len(priv, len); err = mcp251xfd_tef_obj_read(priv, hw_tef_obj, tef_tail, l); if (err) return err; @@ -203,12 +206,12 @@ int mcp251xfd_handle_tefif(struct mcp251xfd_priv *priv) unsigned int frame_len = 0; err = mcp251xfd_handle_tefif_one(priv, &hw_tef_obj[i], &frame_len); - /* -EAGAIN means the Sequence Number in the TEF - * doesn't match our tef_tail. This can happen if we - * read the TEF objects too early. Leave loop let the - * interrupt handler call us again. + /* -EBADMSG means we're affected by mcp2518fd erratum + * DS80000789E 6., i.e. the Sequence Number in the TEF + * doesn't match our tef_tail. Don't process any + * further and mark processed frames as good. */ - if (err == -EAGAIN) + if (err == -EBADMSG) goto out_netif_wake_queue; if (err) return err; @@ -223,6 +226,8 @@ int mcp251xfd_handle_tefif(struct mcp251xfd_priv *priv) struct mcp251xfd_tx_ring *tx_ring = priv->tx; int offset; + ring->head += len; + /* Increment the TEF FIFO tail pointer 'len' times in * a single SPI message. * diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-tx.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-tx.c index 160528d3cc..b1de8052a4 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-tx.c +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-tx.c @@ -131,6 +131,39 @@ mcp251xfd_tx_obj_from_skb(const struct mcp251xfd_priv *priv, tx_obj->xfer[0].len = len; } +static void mcp251xfd_tx_failure_drop(const struct mcp251xfd_priv *priv, + struct mcp251xfd_tx_ring *tx_ring, + int err) +{ + struct net_device *ndev = priv->ndev; + struct net_device_stats *stats = &ndev->stats; + unsigned int frame_len = 0; + u8 tx_head; + + tx_ring->head--; + stats->tx_dropped++; + tx_head = mcp251xfd_get_tx_head(tx_ring); + can_free_echo_skb(ndev, tx_head, &frame_len); + netdev_completed_queue(ndev, 1, frame_len); + netif_wake_queue(ndev); + + if (net_ratelimit()) + netdev_err(priv->ndev, "ERROR in %s: %d\n", __func__, err); +} + +void mcp251xfd_tx_obj_write_sync(struct work_struct *work) +{ + struct mcp251xfd_priv *priv = container_of(work, struct mcp251xfd_priv, + tx_work); + struct mcp251xfd_tx_obj *tx_obj = priv->tx_work_obj; + struct mcp251xfd_tx_ring *tx_ring = priv->tx; + int err; + + err = spi_sync(priv->spi, &tx_obj->msg); + if (err) + mcp251xfd_tx_failure_drop(priv, tx_ring, err); +} + static int mcp251xfd_tx_obj_write(const struct mcp251xfd_priv *priv, struct mcp251xfd_tx_obj *tx_obj) { @@ -162,6 +195,11 @@ static bool mcp251xfd_tx_busy(const struct mcp251xfd_priv *priv, return false; } +static bool mcp251xfd_work_busy(struct work_struct *work) +{ + return work_busy(work); +} + netdev_tx_t mcp251xfd_start_xmit(struct sk_buff *skb, struct net_device *ndev) { @@ -175,7 +213,8 @@ netdev_tx_t mcp251xfd_start_xmit(struct sk_buff *skb, if (can_dev_dropped_skb(ndev, skb)) return NETDEV_TX_OK; - if (mcp251xfd_tx_busy(priv, tx_ring)) + if (mcp251xfd_tx_busy(priv, tx_ring) || + mcp251xfd_work_busy(&priv->tx_work)) return NETDEV_TX_BUSY; tx_obj = mcp251xfd_get_tx_obj_next(tx_ring); @@ -193,13 +232,13 @@ netdev_tx_t mcp251xfd_start_xmit(struct sk_buff *skb, netdev_sent_queue(priv->ndev, frame_len); err = mcp251xfd_tx_obj_write(priv, tx_obj); - if (err) - goto out_err; - - return NETDEV_TX_OK; - - out_err: - netdev_err(priv->ndev, "ERROR in %s: %d\n", __func__, err); + if (err == -EBUSY) { + netif_stop_queue(ndev); + priv->tx_work_obj = tx_obj; + queue_work(priv->wq, &priv->tx_work); + } else if (err) { + mcp251xfd_tx_failure_drop(priv, tx_ring, err); + } return NETDEV_TX_OK; } diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h index 24510b3b80..4628bf847b 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h @@ -524,6 +524,7 @@ struct mcp251xfd_tef_ring { /* u8 obj_num equals tx_ring->obj_num */ /* u8 obj_size equals sizeof(struct mcp251xfd_hw_tef_obj) */ + /* u8 obj_num_shift_to_u8 equals tx_ring->obj_num_shift_to_u8 */ union mcp251xfd_write_reg_buf irq_enable_buf; struct spi_transfer irq_enable_xfer; @@ -542,6 +543,7 @@ struct mcp251xfd_tx_ring { u8 nr; u8 fifo_nr; u8 obj_num; + u8 obj_num_shift_to_u8; u8 obj_size; struct mcp251xfd_tx_obj obj[MCP251XFD_TX_OBJ_NUM_MAX]; @@ -633,6 +635,10 @@ struct mcp251xfd_priv { struct mcp251xfd_rx_ring *rx[MCP251XFD_FIFO_RX_NUM]; struct mcp251xfd_tx_ring tx[MCP251XFD_FIFO_TX_NUM]; + struct workqueue_struct *wq; + struct work_struct tx_work; + struct mcp251xfd_tx_obj *tx_work_obj; + DECLARE_BITMAP(flags, __MCP251XFD_FLAGS_SIZE__); u8 rx_ring_num; @@ -857,17 +863,8 @@ static inline u8 mcp251xfd_get_tef_tail(const struct mcp251xfd_priv *priv) return priv->tef->tail & (priv->tx->obj_num - 1); } -static inline u8 mcp251xfd_get_tef_len(const struct mcp251xfd_priv *priv) -{ - return priv->tef->head - priv->tef->tail; -} - -static inline u8 mcp251xfd_get_tef_linear_len(const struct mcp251xfd_priv *priv) +static inline u8 mcp251xfd_get_tef_linear_len(const struct mcp251xfd_priv *priv, u8 len) { - u8 len; - - len = mcp251xfd_get_tef_len(priv); - return min_t(u8, len, priv->tx->obj_num - mcp251xfd_get_tef_tail(priv)); } @@ -952,6 +949,7 @@ void mcp251xfd_skb_set_timestamp(const struct mcp251xfd_priv *priv, void mcp251xfd_timestamp_init(struct mcp251xfd_priv *priv); void mcp251xfd_timestamp_stop(struct mcp251xfd_priv *priv); +void mcp251xfd_tx_obj_write_sync(struct work_struct *work); netdev_tx_t mcp251xfd_start_xmit(struct sk_buff *skb, struct net_device *ndev); diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c index 8faf8a462c..024169461c 100644 --- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c +++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c @@ -125,6 +125,7 @@ static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leaf_err_liste static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leafimx = { .quirks = 0, + .family = KVASER_LEAF, .ops = &kvaser_usb_leaf_dev_ops, }; @@ -294,7 +295,7 @@ int kvaser_usb_send_cmd_async(struct kvaser_usb_net_priv *priv, void *cmd, } usb_free_urb(urb); - return 0; + return err; } int kvaser_usb_can_rx_over_error(struct net_device *netdev) diff --git a/drivers/net/can/vcan.c b/drivers/net/can/vcan.c index 285635c234..f67e858071 100644 --- a/drivers/net/can/vcan.c +++ b/drivers/net/can/vcan.c @@ -140,7 +140,7 @@ static int vcan_change_mtu(struct net_device *dev, int new_mtu) !can_is_canxl_dev_mtu(new_mtu)) return -EINVAL; - dev->mtu = new_mtu; + WRITE_ONCE(dev->mtu, new_mtu); return 0; } diff --git a/drivers/net/can/vxcan.c b/drivers/net/can/vxcan.c index f7fabba707..9e1b7d4100 100644 --- a/drivers/net/can/vxcan.c +++ b/drivers/net/can/vxcan.c @@ -135,7 +135,7 @@ static int vxcan_change_mtu(struct net_device *dev, int new_mtu) !can_is_canxl_dev_mtu(new_mtu)) return -EINVAL; - dev->mtu = new_mtu; + WRITE_ONCE(dev->mtu, new_mtu); return 0; } |