diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-19 21:00:30 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-19 21:00:30 +0000 |
commit | e54def4ad8144ab15f826416e2e0f290ef1901b4 (patch) | |
tree | 583f8d4bd95cd67c44ff37b878a7eddfca9ab97a /drivers/net/can/m_can/m_can.c | |
parent | Adding upstream version 6.8.12. (diff) | |
download | linux-e54def4ad8144ab15f826416e2e0f290ef1901b4.tar.xz linux-e54def4ad8144ab15f826416e2e0f290ef1901b4.zip |
Adding upstream version 6.9.2.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/net/can/m_can/m_can.c')
-rw-r--r-- | drivers/net/can/m_can/m_can.c | 558 |
1 files changed, 415 insertions, 143 deletions
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index 2395b1225c..14b231c4d7 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -255,6 +255,7 @@ enum m_can_reg { #define TXESC_TBDS_64B 0x7 /* Tx Event FIFO Configuration (TXEFC) */ +#define TXEFC_EFWM_MASK GENMASK(29, 24) #define TXEFC_EFS_MASK GENMASK(21, 16) /* Tx Event FIFO Status (TXEFS) */ @@ -320,6 +321,12 @@ struct id_and_dlc { u32 dlc; }; +struct m_can_fifo_element { + u32 id; + u32 dlc; + u8 data[CANFD_MAX_DLEN]; +}; + static inline u32 m_can_read(struct m_can_classdev *cdev, enum m_can_reg reg) { return cdev->ops->read_reg(cdev, reg); @@ -372,16 +379,6 @@ m_can_txe_fifo_read(struct m_can_classdev *cdev, u32 fgi, u32 offset, u32 *val) return cdev->ops->read_fifo(cdev, addr_offset, val, 1); } -static inline bool _m_can_tx_fifo_full(u32 txfqs) -{ - return !!(txfqs & TXFQS_TFQF); -} - -static inline bool m_can_tx_fifo_full(struct m_can_classdev *cdev) -{ - return _m_can_tx_fifo_full(m_can_read(cdev, M_CAN_TXFQS)); -} - static void m_can_config_endisable(struct m_can_classdev *cdev, bool enable) { u32 cccr = m_can_read(cdev, M_CAN_CCCR); @@ -416,6 +413,25 @@ static void m_can_config_endisable(struct m_can_classdev *cdev, bool enable) } } +static void m_can_interrupt_enable(struct m_can_classdev *cdev, u32 interrupts) +{ + if (cdev->active_interrupts == interrupts) + return; + cdev->ops->write_reg(cdev, M_CAN_IE, interrupts); + cdev->active_interrupts = interrupts; +} + +static void m_can_coalescing_disable(struct m_can_classdev *cdev) +{ + u32 new_interrupts = cdev->active_interrupts | IR_RF0N | IR_TEFN; + + if (!cdev->net->irq) + return; + + hrtimer_cancel(&cdev->hrtimer); + m_can_interrupt_enable(cdev, new_interrupts); +} + static inline void m_can_enable_all_interrupts(struct m_can_classdev *cdev) { if (!cdev->net->irq) { @@ -431,7 +447,9 @@ static inline void m_can_enable_all_interrupts(struct m_can_classdev *cdev) static inline void m_can_disable_all_interrupts(struct m_can_classdev *cdev) { + m_can_coalescing_disable(cdev); m_can_write(cdev, M_CAN_ILE, 0x0); + cdev->active_interrupts = 0x0; if (!cdev->net->irq) { dev_dbg(cdev->dev, "Stop hrtimer\n"); @@ -456,18 +474,26 @@ static u32 m_can_get_timestamp(struct m_can_classdev *cdev) static void m_can_clean(struct net_device *net) { struct m_can_classdev *cdev = netdev_priv(net); + unsigned long irqflags; - if (cdev->tx_skb) { - int putidx = 0; - - net->stats.tx_errors++; - if (cdev->version > 30) - putidx = FIELD_GET(TXFQS_TFQPI_MASK, - m_can_read(cdev, M_CAN_TXFQS)); + if (cdev->tx_ops) { + for (int i = 0; i != cdev->tx_fifo_size; ++i) { + if (!cdev->tx_ops[i].skb) + continue; - can_free_echo_skb(cdev->net, putidx, NULL); - cdev->tx_skb = NULL; + net->stats.tx_errors++; + cdev->tx_ops[i].skb = NULL; + } } + + for (int i = 0; i != cdev->can.echo_skb_max; ++i) + can_free_echo_skb(cdev->net, i, NULL); + + netdev_reset_queue(cdev->net); + + spin_lock_irqsave(&cdev->tx_handling_spinlock, irqflags); + cdev->tx_fifo_in_flight = 0; + spin_unlock_irqrestore(&cdev->tx_handling_spinlock, irqflags); } /* For peripherals, pass skb to rx-offload, which will push skb from @@ -1019,23 +1045,60 @@ static int m_can_poll(struct napi_struct *napi, int quota) * echo. timestamp is used for peripherals to ensure correct ordering * by rx-offload, and is ignored for non-peripherals. */ -static void m_can_tx_update_stats(struct m_can_classdev *cdev, - unsigned int msg_mark, - u32 timestamp) +static unsigned int m_can_tx_update_stats(struct m_can_classdev *cdev, + unsigned int msg_mark, u32 timestamp) { struct net_device *dev = cdev->net; struct net_device_stats *stats = &dev->stats; + unsigned int frame_len; if (cdev->is_peripheral) stats->tx_bytes += can_rx_offload_get_echo_skb_queue_timestamp(&cdev->offload, msg_mark, timestamp, - NULL); + &frame_len); else - stats->tx_bytes += can_get_echo_skb(dev, msg_mark, NULL); + stats->tx_bytes += can_get_echo_skb(dev, msg_mark, &frame_len); stats->tx_packets++; + + return frame_len; +} + +static void m_can_finish_tx(struct m_can_classdev *cdev, int transmitted, + unsigned int transmitted_frame_len) +{ + unsigned long irqflags; + + netdev_completed_queue(cdev->net, transmitted, transmitted_frame_len); + + spin_lock_irqsave(&cdev->tx_handling_spinlock, irqflags); + if (cdev->tx_fifo_in_flight >= cdev->tx_fifo_size && transmitted > 0) + netif_wake_queue(cdev->net); + cdev->tx_fifo_in_flight -= transmitted; + spin_unlock_irqrestore(&cdev->tx_handling_spinlock, irqflags); +} + +static netdev_tx_t m_can_start_tx(struct m_can_classdev *cdev) +{ + unsigned long irqflags; + int tx_fifo_in_flight; + + spin_lock_irqsave(&cdev->tx_handling_spinlock, irqflags); + tx_fifo_in_flight = cdev->tx_fifo_in_flight + 1; + if (tx_fifo_in_flight >= cdev->tx_fifo_size) { + netif_stop_queue(cdev->net); + if (tx_fifo_in_flight > cdev->tx_fifo_size) { + netdev_err_once(cdev->net, "hard_xmit called while TX FIFO full\n"); + spin_unlock_irqrestore(&cdev->tx_handling_spinlock, irqflags); + return NETDEV_TX_BUSY; + } + } + cdev->tx_fifo_in_flight = tx_fifo_in_flight; + spin_unlock_irqrestore(&cdev->tx_handling_spinlock, irqflags); + + return NETDEV_TX_OK; } static int m_can_echo_tx_event(struct net_device *dev) @@ -1047,6 +1110,8 @@ static int m_can_echo_tx_event(struct net_device *dev) int i = 0; int err = 0; unsigned int msg_mark; + int processed = 0; + unsigned int processed_frame_len = 0; struct m_can_classdev *cdev = netdev_priv(dev); @@ -1075,25 +1140,62 @@ static int m_can_echo_tx_event(struct net_device *dev) fgi = (++fgi >= cdev->mcfg[MRAM_TXE].num ? 0 : fgi); /* update stats */ - m_can_tx_update_stats(cdev, msg_mark, timestamp); + processed_frame_len += m_can_tx_update_stats(cdev, msg_mark, + timestamp); + + ++processed; } if (ack_fgi != -1) m_can_write(cdev, M_CAN_TXEFA, FIELD_PREP(TXEFA_EFAI_MASK, ack_fgi)); + m_can_finish_tx(cdev, processed, processed_frame_len); + return err; } +static void m_can_coalescing_update(struct m_can_classdev *cdev, u32 ir) +{ + u32 new_interrupts = cdev->active_interrupts; + bool enable_rx_timer = false; + bool enable_tx_timer = false; + + if (!cdev->net->irq) + return; + + if (cdev->rx_coalesce_usecs_irq > 0 && (ir & (IR_RF0N | IR_RF0W))) { + enable_rx_timer = true; + new_interrupts &= ~IR_RF0N; + } + if (cdev->tx_coalesce_usecs_irq > 0 && (ir & (IR_TEFN | IR_TEFW))) { + enable_tx_timer = true; + new_interrupts &= ~IR_TEFN; + } + if (!enable_rx_timer && !hrtimer_active(&cdev->hrtimer)) + new_interrupts |= IR_RF0N; + if (!enable_tx_timer && !hrtimer_active(&cdev->hrtimer)) + new_interrupts |= IR_TEFN; + + m_can_interrupt_enable(cdev, new_interrupts); + if (enable_rx_timer | enable_tx_timer) + hrtimer_start(&cdev->hrtimer, cdev->irq_timer_wait, + HRTIMER_MODE_REL); +} + static irqreturn_t m_can_isr(int irq, void *dev_id) { struct net_device *dev = (struct net_device *)dev_id; struct m_can_classdev *cdev = netdev_priv(dev); u32 ir; - if (pm_runtime_suspended(cdev->dev)) + if (pm_runtime_suspended(cdev->dev)) { + m_can_coalescing_disable(cdev); return IRQ_NONE; + } + ir = m_can_read(cdev, M_CAN_IR); + m_can_coalescing_update(cdev, ir); if (!ir) return IRQ_NONE; @@ -1108,13 +1210,17 @@ static irqreturn_t m_can_isr(int irq, void *dev_id) * - state change IRQ * - bus error IRQ and bus error reporting */ - if ((ir & IR_RF0N) || (ir & IR_ERR_ALL_30X)) { + if (ir & (IR_RF0N | IR_RF0W | IR_ERR_ALL_30X)) { cdev->irqstatus = ir; if (!cdev->is_peripheral) { m_can_disable_all_interrupts(cdev); napi_schedule(&cdev->napi); - } else if (m_can_rx_peripheral(dev, ir) < 0) { - goto out_fail; + } else { + int pkts; + + pkts = m_can_rx_peripheral(dev, ir); + if (pkts < 0) + goto out_fail; } } @@ -1122,21 +1228,18 @@ static irqreturn_t m_can_isr(int irq, void *dev_id) if (ir & IR_TC) { /* Transmission Complete Interrupt*/ u32 timestamp = 0; + unsigned int frame_len; if (cdev->is_peripheral) timestamp = m_can_get_timestamp(cdev); - m_can_tx_update_stats(cdev, 0, timestamp); - netif_wake_queue(dev); + frame_len = m_can_tx_update_stats(cdev, 0, timestamp); + m_can_finish_tx(cdev, 1, frame_len); } } else { - if (ir & IR_TEFN) { + if (ir & (IR_TEFN | IR_TEFW)) { /* New TX FIFO Element arrived */ if (m_can_echo_tx_event(dev) != 0) goto out_fail; - - if (netif_queue_stopped(dev) && - !m_can_tx_fifo_full(cdev)) - netif_wake_queue(dev); } } @@ -1150,6 +1253,15 @@ out_fail: return IRQ_HANDLED; } +static enum hrtimer_restart m_can_coalescing_timer(struct hrtimer *timer) +{ + struct m_can_classdev *cdev = container_of(timer, struct m_can_classdev, hrtimer); + + irq_wake_thread(cdev->net->irq, cdev->net); + + return HRTIMER_NORESTART; +} + static const struct can_bittiming_const m_can_bittiming_const_30X = { .name = KBUILD_MODNAME, .tseg1_min = 2, /* Time segment 1 = prop_seg + phase_seg1 */ @@ -1288,9 +1400,8 @@ static int m_can_chip_config(struct net_device *dev) } /* Disable unused interrupts */ - interrupts &= ~(IR_ARA | IR_ELO | IR_DRX | IR_TEFF | IR_TEFW | IR_TFE | - IR_TCF | IR_HPM | IR_RF1F | IR_RF1W | IR_RF1N | - IR_RF0F | IR_RF0W); + interrupts &= ~(IR_ARA | IR_ELO | IR_DRX | IR_TEFF | IR_TFE | IR_TCF | + IR_HPM | IR_RF1F | IR_RF1W | IR_RF1N | IR_RF0F); m_can_config_endisable(cdev, true); @@ -1327,6 +1438,8 @@ static int m_can_chip_config(struct net_device *dev) } else { /* Full TX Event FIFO is used */ m_can_write(cdev, M_CAN_TXEFC, + FIELD_PREP(TXEFC_EFWM_MASK, + cdev->tx_max_coalesced_frames_irq) | FIELD_PREP(TXEFC_EFS_MASK, cdev->mcfg[MRAM_TXE].num) | cdev->mcfg[MRAM_TXE].off); @@ -1334,6 +1447,7 @@ static int m_can_chip_config(struct net_device *dev) /* rx fifo configuration, blocking mode, fifo size 1 */ m_can_write(cdev, M_CAN_RXF0C, + FIELD_PREP(RXFC_FWM_MASK, cdev->rx_max_coalesced_frames_irq) | FIELD_PREP(RXFC_FS_MASK, cdev->mcfg[MRAM_RXF0].num) | cdev->mcfg[MRAM_RXF0].off); @@ -1392,7 +1506,7 @@ static int m_can_chip_config(struct net_device *dev) else interrupts &= ~(IR_ERR_LEC_31X); } - m_can_write(cdev, M_CAN_IE, interrupts); + m_can_interrupt_enable(cdev, interrupts); /* route all interrupts to INT0 */ m_can_write(cdev, M_CAN_ILS, ILS_ALL_INT0); @@ -1425,10 +1539,17 @@ static int m_can_start(struct net_device *dev) if (ret) return ret; + netdev_queue_set_dql_min_limit(netdev_get_tx_queue(cdev->net, 0), + cdev->tx_max_coalesced_frames); + cdev->can.state = CAN_STATE_ERROR_ACTIVE; m_can_enable_all_interrupts(cdev); + if (cdev->version > 30) + cdev->tx_fifo_putidx = FIELD_GET(TXFQS_TFQPI_MASK, + m_can_read(cdev, M_CAN_TXFQS)); + return 0; } @@ -1606,8 +1727,9 @@ static int m_can_close(struct net_device *dev) m_can_clk_stop(cdev); free_irq(dev->irq, dev); + m_can_clean(dev); + if (cdev->is_peripheral) { - cdev->tx_skb = NULL; destroy_workqueue(cdev->tx_wq); cdev->tx_wq = NULL; can_rx_offload_disable(&cdev->offload); @@ -1620,57 +1742,42 @@ static int m_can_close(struct net_device *dev) return 0; } -static int m_can_next_echo_skb_occupied(struct net_device *dev, int putidx) -{ - struct m_can_classdev *cdev = netdev_priv(dev); - /*get wrap around for loopback skb index */ - unsigned int wrap = cdev->can.echo_skb_max; - int next_idx; - - /* calculate next index */ - next_idx = (++putidx >= wrap ? 0 : putidx); - - /* check if occupied */ - return !!cdev->can.echo_skb[next_idx]; -} - -static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev) +static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev, + struct sk_buff *skb) { - struct canfd_frame *cf = (struct canfd_frame *)cdev->tx_skb->data; + struct canfd_frame *cf = (struct canfd_frame *)skb->data; + u8 len_padded = DIV_ROUND_UP(cf->len, 4); + struct m_can_fifo_element fifo_element; struct net_device *dev = cdev->net; - struct sk_buff *skb = cdev->tx_skb; - struct id_and_dlc fifo_header; u32 cccr, fdflags; - u32 txfqs; int err; - int putidx; - - cdev->tx_skb = NULL; + u32 putidx; + unsigned int frame_len = can_skb_get_frame_len(skb); /* Generate ID field for TX buffer Element */ /* Common to all supported M_CAN versions */ if (cf->can_id & CAN_EFF_FLAG) { - fifo_header.id = cf->can_id & CAN_EFF_MASK; - fifo_header.id |= TX_BUF_XTD; + fifo_element.id = cf->can_id & CAN_EFF_MASK; + fifo_element.id |= TX_BUF_XTD; } else { - fifo_header.id = ((cf->can_id & CAN_SFF_MASK) << 18); + fifo_element.id = ((cf->can_id & CAN_SFF_MASK) << 18); } if (cf->can_id & CAN_RTR_FLAG) - fifo_header.id |= TX_BUF_RTR; + fifo_element.id |= TX_BUF_RTR; if (cdev->version == 30) { netif_stop_queue(dev); - fifo_header.dlc = can_fd_len2dlc(cf->len) << 16; + fifo_element.dlc = can_fd_len2dlc(cf->len) << 16; /* Write the frame ID, DLC, and payload to the FIFO element. */ - err = m_can_fifo_write(cdev, 0, M_CAN_FIFO_ID, &fifo_header, 2); + err = m_can_fifo_write(cdev, 0, M_CAN_FIFO_ID, &fifo_element, 2); if (err) goto out_fail; err = m_can_fifo_write(cdev, 0, M_CAN_FIFO_DATA, - cf->data, DIV_ROUND_UP(cf->len, 4)); + cf->data, len_padded); if (err) goto out_fail; @@ -1691,33 +1798,15 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev) } m_can_write(cdev, M_CAN_TXBTIE, 0x1); - can_put_echo_skb(skb, dev, 0, 0); + can_put_echo_skb(skb, dev, 0, frame_len); m_can_write(cdev, M_CAN_TXBAR, 0x1); /* End of xmit function for version 3.0.x */ } else { /* Transmit routine for version >= v3.1.x */ - txfqs = m_can_read(cdev, M_CAN_TXFQS); - - /* Check if FIFO full */ - if (_m_can_tx_fifo_full(txfqs)) { - /* This shouldn't happen */ - netif_stop_queue(dev); - netdev_warn(dev, - "TX queue active although FIFO is full."); - - if (cdev->is_peripheral) { - kfree_skb(skb); - dev->stats.tx_dropped++; - return NETDEV_TX_OK; - } else { - return NETDEV_TX_BUSY; - } - } - /* get put index for frame */ - putidx = FIELD_GET(TXFQS_TFQPI_MASK, txfqs); + putidx = cdev->tx_fifo_putidx; /* Construct DLC Field, with CAN-FD configuration. * Use the put index of the fifo as the message marker, @@ -1732,30 +1821,32 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev) fdflags |= TX_BUF_BRS; } - fifo_header.dlc = FIELD_PREP(TX_BUF_MM_MASK, putidx) | + fifo_element.dlc = FIELD_PREP(TX_BUF_MM_MASK, putidx) | FIELD_PREP(TX_BUF_DLC_MASK, can_fd_len2dlc(cf->len)) | fdflags | TX_BUF_EFC; - err = m_can_fifo_write(cdev, putidx, M_CAN_FIFO_ID, &fifo_header, 2); - if (err) - goto out_fail; - err = m_can_fifo_write(cdev, putidx, M_CAN_FIFO_DATA, - cf->data, DIV_ROUND_UP(cf->len, 4)); + memcpy_and_pad(fifo_element.data, CANFD_MAX_DLEN, &cf->data, + cf->len, 0); + + err = m_can_fifo_write(cdev, putidx, M_CAN_FIFO_ID, + &fifo_element, 2 + len_padded); if (err) goto out_fail; /* Push loopback echo. * Will be looped back on TX interrupt based on message marker */ - can_put_echo_skb(skb, dev, putidx, 0); + can_put_echo_skb(skb, dev, putidx, frame_len); - /* Enable TX FIFO element to start transfer */ - m_can_write(cdev, M_CAN_TXBAR, (1 << putidx)); - - /* stop network queue if fifo full */ - if (m_can_tx_fifo_full(cdev) || - m_can_next_echo_skb_occupied(dev, putidx)) - netif_stop_queue(dev); + if (cdev->is_peripheral) { + /* Delay enabling TX FIFO element */ + cdev->tx_peripheral_submit |= BIT(putidx); + } else { + /* Enable TX FIFO element to start transfer */ + m_can_write(cdev, M_CAN_TXBAR, BIT(putidx)); + } + cdev->tx_fifo_putidx = (++cdev->tx_fifo_putidx >= cdev->can.echo_skb_max ? + 0 : cdev->tx_fifo_putidx); } return NETDEV_TX_OK; @@ -1766,46 +1857,91 @@ out_fail: return NETDEV_TX_BUSY; } +static void m_can_tx_submit(struct m_can_classdev *cdev) +{ + if (cdev->version == 30) + return; + if (!cdev->is_peripheral) + return; + + m_can_write(cdev, M_CAN_TXBAR, cdev->tx_peripheral_submit); + cdev->tx_peripheral_submit = 0; +} + static void m_can_tx_work_queue(struct work_struct *ws) { - struct m_can_classdev *cdev = container_of(ws, struct m_can_classdev, - tx_work); + struct m_can_tx_op *op = container_of(ws, struct m_can_tx_op, work); + struct m_can_classdev *cdev = op->cdev; + struct sk_buff *skb = op->skb; + + op->skb = NULL; + m_can_tx_handler(cdev, skb); + if (op->submit) + m_can_tx_submit(cdev); +} + +static void m_can_tx_queue_skb(struct m_can_classdev *cdev, struct sk_buff *skb, + bool submit) +{ + cdev->tx_ops[cdev->next_tx_op].skb = skb; + cdev->tx_ops[cdev->next_tx_op].submit = submit; + queue_work(cdev->tx_wq, &cdev->tx_ops[cdev->next_tx_op].work); - m_can_tx_handler(cdev); + ++cdev->next_tx_op; + if (cdev->next_tx_op >= cdev->tx_fifo_size) + cdev->next_tx_op = 0; +} + +static netdev_tx_t m_can_start_peripheral_xmit(struct m_can_classdev *cdev, + struct sk_buff *skb) +{ + bool submit; + + ++cdev->nr_txs_without_submit; + if (cdev->nr_txs_without_submit >= cdev->tx_max_coalesced_frames || + !netdev_xmit_more()) { + cdev->nr_txs_without_submit = 0; + submit = true; + } else { + submit = false; + } + m_can_tx_queue_skb(cdev, skb, submit); + + return NETDEV_TX_OK; } static netdev_tx_t m_can_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct m_can_classdev *cdev = netdev_priv(dev); + unsigned int frame_len; + netdev_tx_t ret; if (can_dev_dropped_skb(dev, skb)) return NETDEV_TX_OK; - if (cdev->is_peripheral) { - if (cdev->tx_skb) { - netdev_err(dev, "hard_xmit called while tx busy\n"); - return NETDEV_TX_BUSY; - } + frame_len = can_skb_get_frame_len(skb); - if (cdev->can.state == CAN_STATE_BUS_OFF) { - m_can_clean(dev); - } else { - /* Need to stop the queue to avoid numerous requests - * from being sent. Suggested improvement is to create - * a queueing mechanism that will queue the skbs and - * process them in order. - */ - cdev->tx_skb = skb; - netif_stop_queue(cdev->net); - queue_work(cdev->tx_wq, &cdev->tx_work); - } - } else { - cdev->tx_skb = skb; - return m_can_tx_handler(cdev); + if (cdev->can.state == CAN_STATE_BUS_OFF) { + m_can_clean(cdev->net); + return NETDEV_TX_OK; } - return NETDEV_TX_OK; + ret = m_can_start_tx(cdev); + if (ret != NETDEV_TX_OK) + return ret; + + netdev_sent_queue(dev, frame_len); + + if (cdev->is_peripheral) + ret = m_can_start_peripheral_xmit(cdev, skb); + else + ret = m_can_tx_handler(cdev, skb); + + if (ret != NETDEV_TX_OK) + netdev_completed_queue(dev, 1, frame_len); + + return ret; } static enum hrtimer_restart hrtimer_callback(struct hrtimer *timer) @@ -1845,15 +1981,17 @@ static int m_can_open(struct net_device *dev) /* register interrupt handler */ if (cdev->is_peripheral) { - cdev->tx_skb = NULL; - cdev->tx_wq = alloc_workqueue("mcan_wq", - WQ_FREEZABLE | WQ_MEM_RECLAIM, 0); + cdev->tx_wq = alloc_ordered_workqueue("mcan_wq", + WQ_FREEZABLE | WQ_MEM_RECLAIM); if (!cdev->tx_wq) { err = -ENOMEM; goto out_wq_fail; } - INIT_WORK(&cdev->tx_work, m_can_tx_work_queue); + for (int i = 0; i != cdev->tx_fifo_size; ++i) { + cdev->tx_ops[i].cdev = cdev; + INIT_WORK(&cdev->tx_ops[i].work, m_can_tx_work_queue); + } err = request_threaded_irq(dev->irq, NULL, m_can_isr, IRQF_ONESHOT, @@ -1901,7 +2039,108 @@ static const struct net_device_ops m_can_netdev_ops = { .ndo_change_mtu = can_change_mtu, }; +static int m_can_get_coalesce(struct net_device *dev, + struct ethtool_coalesce *ec, + struct kernel_ethtool_coalesce *kec, + struct netlink_ext_ack *ext_ack) +{ + struct m_can_classdev *cdev = netdev_priv(dev); + + ec->rx_max_coalesced_frames_irq = cdev->rx_max_coalesced_frames_irq; + ec->rx_coalesce_usecs_irq = cdev->rx_coalesce_usecs_irq; + ec->tx_max_coalesced_frames = cdev->tx_max_coalesced_frames; + ec->tx_max_coalesced_frames_irq = cdev->tx_max_coalesced_frames_irq; + ec->tx_coalesce_usecs_irq = cdev->tx_coalesce_usecs_irq; + + return 0; +} + +static int m_can_set_coalesce(struct net_device *dev, + struct ethtool_coalesce *ec, + struct kernel_ethtool_coalesce *kec, + struct netlink_ext_ack *ext_ack) +{ + struct m_can_classdev *cdev = netdev_priv(dev); + + if (cdev->can.state != CAN_STATE_STOPPED) { + netdev_err(dev, "Device is in use, please shut it down first\n"); + return -EBUSY; + } + + if (ec->rx_max_coalesced_frames_irq > cdev->mcfg[MRAM_RXF0].num) { + netdev_err(dev, "rx-frames-irq %u greater than the RX FIFO %u\n", + ec->rx_max_coalesced_frames_irq, + cdev->mcfg[MRAM_RXF0].num); + return -EINVAL; + } + if ((ec->rx_max_coalesced_frames_irq == 0) != (ec->rx_coalesce_usecs_irq == 0)) { + netdev_err(dev, "rx-frames-irq and rx-usecs-irq can only be set together\n"); + return -EINVAL; + } + if (ec->tx_max_coalesced_frames_irq > cdev->mcfg[MRAM_TXE].num) { + netdev_err(dev, "tx-frames-irq %u greater than the TX event FIFO %u\n", + ec->tx_max_coalesced_frames_irq, + cdev->mcfg[MRAM_TXE].num); + return -EINVAL; + } + if (ec->tx_max_coalesced_frames_irq > cdev->mcfg[MRAM_TXB].num) { + netdev_err(dev, "tx-frames-irq %u greater than the TX FIFO %u\n", + ec->tx_max_coalesced_frames_irq, + cdev->mcfg[MRAM_TXB].num); + return -EINVAL; + } + if ((ec->tx_max_coalesced_frames_irq == 0) != (ec->tx_coalesce_usecs_irq == 0)) { + netdev_err(dev, "tx-frames-irq and tx-usecs-irq can only be set together\n"); + return -EINVAL; + } + if (ec->tx_max_coalesced_frames > cdev->mcfg[MRAM_TXE].num) { + netdev_err(dev, "tx-frames %u greater than the TX event FIFO %u\n", + ec->tx_max_coalesced_frames, + cdev->mcfg[MRAM_TXE].num); + return -EINVAL; + } + if (ec->tx_max_coalesced_frames > cdev->mcfg[MRAM_TXB].num) { + netdev_err(dev, "tx-frames %u greater than the TX FIFO %u\n", + ec->tx_max_coalesced_frames, + cdev->mcfg[MRAM_TXB].num); + return -EINVAL; + } + if (ec->rx_coalesce_usecs_irq != 0 && ec->tx_coalesce_usecs_irq != 0 && + ec->rx_coalesce_usecs_irq != ec->tx_coalesce_usecs_irq) { + netdev_err(dev, "rx-usecs-irq %u needs to be equal to tx-usecs-irq %u if both are enabled\n", + ec->rx_coalesce_usecs_irq, + ec->tx_coalesce_usecs_irq); + return -EINVAL; + } + + cdev->rx_max_coalesced_frames_irq = ec->rx_max_coalesced_frames_irq; + cdev->rx_coalesce_usecs_irq = ec->rx_coalesce_usecs_irq; + cdev->tx_max_coalesced_frames = ec->tx_max_coalesced_frames; + cdev->tx_max_coalesced_frames_irq = ec->tx_max_coalesced_frames_irq; + cdev->tx_coalesce_usecs_irq = ec->tx_coalesce_usecs_irq; + + if (cdev->rx_coalesce_usecs_irq) + cdev->irq_timer_wait = + ns_to_ktime(cdev->rx_coalesce_usecs_irq * NSEC_PER_USEC); + else + cdev->irq_timer_wait = + ns_to_ktime(cdev->tx_coalesce_usecs_irq * NSEC_PER_USEC); + + return 0; +} + static const struct ethtool_ops m_can_ethtool_ops = { + .supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS_IRQ | + ETHTOOL_COALESCE_RX_MAX_FRAMES_IRQ | + ETHTOOL_COALESCE_TX_USECS_IRQ | + ETHTOOL_COALESCE_TX_MAX_FRAMES | + ETHTOOL_COALESCE_TX_MAX_FRAMES_IRQ, + .get_ts_info = ethtool_op_get_ts_info, + .get_coalesce = m_can_get_coalesce, + .set_coalesce = m_can_set_coalesce, +}; + +static const struct ethtool_ops m_can_ethtool_ops_polling = { .get_ts_info = ethtool_op_get_ts_info, }; @@ -1909,7 +2148,10 @@ static int register_m_can_dev(struct net_device *dev) { dev->flags |= IFF_ECHO; /* we support local echo */ dev->netdev_ops = &m_can_netdev_ops; - dev->ethtool_ops = &m_can_ethtool_ops; + if (dev->irq) + dev->ethtool_ops = &m_can_ethtool_ops; + else + dev->ethtool_ops = &m_can_ethtool_ops_polling; return register_candev(dev); } @@ -2057,12 +2299,23 @@ int m_can_class_register(struct m_can_classdev *cdev) { int ret; - if (cdev->pm_clock_support) { - ret = m_can_clk_start(cdev); - if (ret) - return ret; + cdev->tx_fifo_size = max(1, min(cdev->mcfg[MRAM_TXB].num, + cdev->mcfg[MRAM_TXE].num)); + if (cdev->is_peripheral) { + cdev->tx_ops = + devm_kzalloc(cdev->dev, + cdev->tx_fifo_size * sizeof(*cdev->tx_ops), + GFP_KERNEL); + if (!cdev->tx_ops) { + dev_err(cdev->dev, "Failed to allocate tx_ops for workqueue\n"); + return -ENOMEM; + } } + ret = m_can_clk_start(cdev); + if (ret) + return ret; + if (cdev->is_peripheral) { ret = can_rx_offload_add_manual(cdev->net, &cdev->offload, NAPI_POLL_WEIGHT); @@ -2070,8 +2323,15 @@ int m_can_class_register(struct m_can_classdev *cdev) goto clk_disable; } - if (!cdev->net->irq) + if (!cdev->net->irq) { + dev_dbg(cdev->dev, "Polling enabled, initialize hrtimer"); + hrtimer_init(&cdev->hrtimer, CLOCK_MONOTONIC, + HRTIMER_MODE_REL_PINNED); cdev->hrtimer.function = &hrtimer_callback; + } else { + hrtimer_init(&cdev->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + cdev->hrtimer.function = m_can_coalescing_timer; + } ret = m_can_dev_setup(cdev); if (ret) @@ -2122,7 +2382,15 @@ int m_can_class_suspend(struct device *dev) if (netif_running(ndev)) { netif_stop_queue(ndev); netif_device_detach(ndev); - m_can_stop(ndev); + + /* leave the chip running with rx interrupt enabled if it is + * used as a wake-up source. + */ + if (cdev->pm_wake_source) + m_can_write(cdev, M_CAN_IE, IR_RF0N); + else + m_can_stop(ndev); + m_can_clk_stop(cdev); } @@ -2149,11 +2417,15 @@ int m_can_class_resume(struct device *dev) ret = m_can_clk_start(cdev); if (ret) return ret; - ret = m_can_start(ndev); - if (ret) { - m_can_clk_stop(cdev); - return ret; + if (cdev->pm_wake_source) { + m_can_write(cdev, M_CAN_IE, cdev->active_interrupts); + } else { + ret = m_can_start(ndev); + if (ret) { + m_can_clk_stop(cdev); + return ret; + } } netif_device_attach(ndev); |