diff options
| -rw-r--r-- | drivers/net/ethernet/xilinx/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/net/ethernet/xilinx/xilinx_axienet.h | 33 | ||||
| -rw-r--r-- | drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 393 |
3 files changed, 425 insertions, 2 deletions
diff --git a/drivers/net/ethernet/xilinx/Kconfig b/drivers/net/ethernet/xilinx/Kconfig index 0014729b8865..35d96c633a33 100644 --- a/drivers/net/ethernet/xilinx/Kconfig +++ b/drivers/net/ethernet/xilinx/Kconfig @@ -26,6 +26,7 @@ config XILINX_EMACLITE config XILINX_AXI_EMAC tristate "Xilinx 10/100/1000 AXI Ethernet support" depends on HAS_IOMEM + depends on XILINX_DMA select PHYLINK help This driver supports the 10/100/1000 Ethernet from Xilinx for the diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet.h b/drivers/net/ethernet/xilinx/xilinx_axienet.h index 3ead0bac597b..807ead678551 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet.h +++ b/drivers/net/ethernet/xilinx/xilinx_axienet.h @@ -14,6 +14,7 @@ #include <linux/interrupt.h> #include <linux/if_vlan.h> #include <linux/phylink.h> +#include <linux/skbuff.h> /* Packet size info */ #define XAE_HDR_SIZE 14 /* Size of Ethernet header */ @@ -379,6 +380,22 @@ struct axidma_bd { #define XAE_NUM_MISC_CLOCKS 3 /** + * struct skbuf_dma_descriptor - skb for each dma descriptor + * @sgl: Pointer for sglist. + * @desc: Pointer to dma descriptor. + * @dma_address: dma address of sglist. + * @skb: Pointer to SKB transferred using DMA + * @sg_len: number of entries in the sglist. + */ +struct skbuf_dma_descriptor { + struct scatterlist sgl[MAX_SKB_FRAGS + 1]; + struct dma_async_tx_descriptor *desc; + dma_addr_t dma_address; + struct sk_buff *skb; + int sg_len; +}; + +/** * struct axienet_local - axienet private per device data * @ndev: Pointer for net_device to which it will be attached. * @dev: Pointer to device structure @@ -436,6 +453,14 @@ struct axidma_bd { * @coalesce_count_tx: Store the irq coalesce on TX side. * @coalesce_usec_tx: IRQ coalesce delay for TX * @use_dmaengine: flag to check dmaengine framework usage. + * @tx_chan: TX DMA channel. + * @rx_chan: RX DMA channel. + * @tx_skb_ring: Pointer to TX skb ring buffer array. + * @rx_skb_ring: Pointer to RX skb ring buffer array. + * @tx_ring_head: TX skb ring buffer head index. + * @tx_ring_tail: TX skb ring buffer tail index. + * @rx_ring_head: RX skb ring buffer head index. + * @rx_ring_tail: RX skb ring buffer tail index. */ struct axienet_local { struct net_device *ndev; @@ -501,6 +526,14 @@ struct axienet_local { u32 coalesce_count_tx; u32 coalesce_usec_tx; u8 use_dmaengine; + struct dma_chan *tx_chan; + struct dma_chan *rx_chan; + struct skbuf_dma_descriptor **tx_skb_ring; + struct skbuf_dma_descriptor **rx_skb_ring; + int tx_ring_head; + int tx_ring_tail; + int rx_ring_head; + int rx_ring_tail; }; /** diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c index 188b03e86263..7d8e22929385 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c @@ -38,6 +38,11 @@ #include <linux/phy.h> #include <linux/mii.h> #include <linux/ethtool.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/dma/xilinx_dma.h> +#include <linux/circ_buf.h> +#include <net/netdev_queues.h> #include "xilinx_axienet.h" @@ -47,6 +52,9 @@ #define TX_BD_NUM_MIN (MAX_SKB_FRAGS + 1) #define TX_BD_NUM_MAX 4096 #define RX_BD_NUM_MAX 4096 +#define DMA_NUM_APP_WORDS 5 +#define LEN_APP 4 +#define RX_BUF_NUM_DEFAULT 128 /* Must be shorter than length of ethtool_drvinfo.driver field to fit */ #define DRIVER_NAME "xaxienet" @@ -55,6 +63,8 @@ #define AXIENET_REGS_N 40 +static void axienet_rx_submit_desc(struct net_device *ndev); + /* Match table for of_platform binding */ static const struct of_device_id axienet_of_match[] = { { .compatible = "xlnx,axi-ethernet-1.00.a", }, @@ -120,6 +130,16 @@ static struct axienet_option axienet_options[] = { {} }; +static struct skbuf_dma_descriptor *axienet_get_rx_desc(struct axienet_local *lp, int i) +{ + return lp->rx_skb_ring[i & (RX_BUF_NUM_DEFAULT - 1)]; +} + +static struct skbuf_dma_descriptor *axienet_get_tx_desc(struct axienet_local *lp, int i) +{ + return lp->tx_skb_ring[i & (TX_BD_NUM_MAX - 1)]; +} + /** * axienet_dma_in32 - Memory mapped Axi DMA register read * @lp: Pointer to axienet local structure @@ -728,6 +748,128 @@ static inline int axienet_check_tx_bd_space(struct axienet_local *lp, } /** + * axienet_dma_tx_cb - DMA engine callback for TX channel. + * @data: Pointer to the axienet_local structure. + * @result: error reporting through dmaengine_result. + * This function is called by dmaengine driver for TX channel to notify + * that the transmit is done. + */ +static void axienet_dma_tx_cb(void *data, const struct dmaengine_result *result) +{ + struct skbuf_dma_descriptor *skbuf_dma; + struct axienet_local *lp = data; + struct netdev_queue *txq; + int len; + + skbuf_dma = axienet_get_tx_desc(lp, lp->tx_ring_tail++); + len = skbuf_dma->skb->len; + txq = skb_get_tx_queue(lp->ndev, skbuf_dma->skb); + u64_stats_update_begin(&lp->tx_stat_sync); + u64_stats_add(&lp->tx_bytes, len); + u64_stats_add(&lp->tx_packets, 1); + u64_stats_update_end(&lp->tx_stat_sync); + dma_unmap_sg(lp->dev, skbuf_dma->sgl, skbuf_dma->sg_len, DMA_TO_DEVICE); + dev_consume_skb_any(skbuf_dma->skb); + netif_txq_completed_wake(txq, 1, len, + CIRC_SPACE(lp->tx_ring_head, lp->tx_ring_tail, TX_BD_NUM_MAX), + 2 * MAX_SKB_FRAGS); +} + +/** + * axienet_start_xmit_dmaengine - Starts the transmission. + * @skb: sk_buff pointer that contains data to be Txed. + * @ndev: Pointer to net_device structure. + * + * Return: NETDEV_TX_OK on success or any non space errors. + * NETDEV_TX_BUSY when free element in TX skb ring buffer + * is not available. + * + * This function is invoked to initiate transmission. The + * function sets the skbs, register dma callback API and submit + * the dma transaction. + * Additionally if checksum offloading is supported, + * it populates AXI Stream Control fields with appropriate values. + */ +static netdev_tx_t +axienet_start_xmit_dmaengine(struct sk_buff *skb, struct net_device *ndev) +{ + struct dma_async_tx_descriptor *dma_tx_desc = NULL; + struct axienet_local *lp = netdev_priv(ndev); + u32 app_metadata[DMA_NUM_APP_WORDS] = {0}; + struct skbuf_dma_descriptor *skbuf_dma; + struct dma_device *dma_dev; + struct netdev_queue *txq; + u32 csum_start_off; + u32 csum_index_off; + int sg_len; + int ret; + + dma_dev = lp->tx_chan->device; + sg_len = skb_shinfo(skb)->nr_frags + 1; + if (CIRC_SPACE(lp->tx_ring_head, lp->tx_ring_tail, TX_BD_NUM_MAX) <= sg_len) { + netif_stop_queue(ndev); + if (net_ratelimit()) + netdev_warn(ndev, "TX ring unexpectedly full\n"); + return NETDEV_TX_BUSY; + } + + skbuf_dma = axienet_get_tx_desc(lp, lp->tx_ring_head); + if (!skbuf_dma) + goto xmit_error_drop_skb; + + lp->tx_ring_head++; + sg_init_table(skbuf_dma->sgl, sg_len); + ret = skb_to_sgvec(skb, skbuf_dma->sgl, 0, skb->len); + if (ret < 0) + goto xmit_error_drop_skb; + + ret = dma_map_sg(lp->dev, skbuf_dma->sgl, sg_len, DMA_TO_DEVICE); + if (!ret) + goto xmit_error_drop_skb; + + /* Fill up app fields for checksum */ + if (skb->ip_summed == CHECKSUM_PARTIAL) { + if (lp->features & XAE_FEATURE_FULL_TX_CSUM) { + /* Tx Full Checksum Offload Enabled */ + app_metadata[0] |= 2; + } else if (lp->features & XAE_FEATURE_PARTIAL_TX_CSUM) { + csum_start_off = skb_transport_offset(skb); + csum_index_off = csum_start_off + skb->csum_offset; + /* Tx Partial Checksum Offload Enabled */ + app_metadata[0] |= 1; + app_metadata[1] = (csum_start_off << 16) | csum_index_off; + } + } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { + app_metadata[0] |= 2; /* Tx Full Checksum Offload Enabled */ + } + + dma_tx_desc = dma_dev->device_prep_slave_sg(lp->tx_chan, skbuf_dma->sgl, + sg_len, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT, (void *)app_metadata); + if (!dma_tx_desc) + goto xmit_error_unmap_sg; + + skbuf_dma->skb = skb; + skbuf_dma->sg_len = sg_len; + dma_tx_desc->callback_param = lp; + dma_tx_desc->callback_result = axienet_dma_tx_cb; + dmaengine_submit(dma_tx_desc); + dma_async_issue_pending(lp->tx_chan); + txq = skb_get_tx_queue(lp->ndev, skb); + netdev_tx_sent_queue(txq, skb->len); + netif_txq_maybe_stop(txq, CIRC_SPACE(lp->tx_ring_head, lp->tx_ring_tail, TX_BD_NUM_MAX), + MAX_SKB_FRAGS + 1, 2 * MAX_SKB_FRAGS); + + return NETDEV_TX_OK; + +xmit_error_unmap_sg: + dma_unmap_sg(lp->dev, skbuf_dma->sgl, sg_len, DMA_TO_DEVICE); +xmit_error_drop_skb: + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; +} + +/** * axienet_tx_poll - Invoked once a transmit is completed by the * Axi DMA Tx channel. * @napi: Pointer to NAPI structure. @@ -894,6 +1036,42 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev) } /** + * axienet_dma_rx_cb - DMA engine callback for RX channel. + * @data: Pointer to the skbuf_dma_descriptor structure. + * @result: error reporting through dmaengine_result. + * This function is called by dmaengine driver for RX channel to notify + * that the packet is received. + */ +static void axienet_dma_rx_cb(void *data, const struct dmaengine_result *result) +{ + struct skbuf_dma_descriptor *skbuf_dma; + size_t meta_len, meta_max_len, rx_len; + struct axienet_local *lp = data; + struct sk_buff *skb; + u32 *app_metadata; + + skbuf_dma = axienet_get_rx_desc(lp, lp->rx_ring_tail++); + skb = skbuf_dma->skb; + app_metadata = dmaengine_desc_get_metadata_ptr(skbuf_dma->desc, &meta_len, + &meta_max_len); + dma_unmap_single(lp->dev, skbuf_dma->dma_address, lp->max_frm_size, + DMA_FROM_DEVICE); + /* TODO: Derive app word index programmatically */ + rx_len = (app_metadata[LEN_APP] & 0xFFFF); + skb_put(skb, rx_len); + skb->protocol = eth_type_trans(skb, lp->ndev); + skb->ip_summed = CHECKSUM_NONE; + + __netif_rx(skb); + u64_stats_update_begin(&lp->rx_stat_sync); + u64_stats_add(&lp->rx_packets, 1); + u64_stats_add(&lp->rx_bytes, rx_len); + u64_stats_update_end(&lp->rx_stat_sync); + axienet_rx_submit_desc(lp->ndev); + dma_async_issue_pending(lp->rx_chan); +} + +/** * axienet_rx_poll - Triggered by RX ISR to complete the BD processing. * @napi: Pointer to NAPI structure. * @budget: Max number of RX packets to process. @@ -1127,6 +1305,144 @@ static irqreturn_t axienet_eth_irq(int irq, void *_ndev) static void axienet_dma_err_handler(struct work_struct *work); /** + * axienet_rx_submit_desc - Submit the rx descriptors to dmaengine. + * allocate skbuff, map the scatterlist and obtain a descriptor + * and then add the callback information and submit descriptor. + * + * @ndev: net_device pointer + * + */ +static void axienet_rx_submit_desc(struct net_device *ndev) +{ + struct dma_async_tx_descriptor *dma_rx_desc = NULL; + struct axienet_local *lp = netdev_priv(ndev); + struct skbuf_dma_descriptor *skbuf_dma; + struct sk_buff *skb; + dma_addr_t addr; + + skbuf_dma = axienet_get_rx_desc(lp, lp->rx_ring_head); + if (!skbuf_dma) + return; + + lp->rx_ring_head++; + skb = netdev_alloc_skb(ndev, lp->max_frm_size); + if (!skb) + return; + + sg_init_table(skbuf_dma->sgl, 1); + addr = dma_map_single(lp->dev, skb->data, lp->max_frm_size, DMA_FROM_DEVICE); + if (unlikely(dma_mapping_error(lp->dev, addr))) { + if (net_ratelimit()) + netdev_err(ndev, "DMA mapping error\n"); + goto rx_submit_err_free_skb; + } + sg_dma_address(skbuf_dma->sgl) = addr; + sg_dma_len(skbuf_dma->sgl) = lp->max_frm_size; + dma_rx_desc = dmaengine_prep_slave_sg(lp->rx_chan, skbuf_dma->sgl, + 1, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT); + if (!dma_rx_desc) + goto rx_submit_err_unmap_skb; + + skbuf_dma->skb = skb; + skbuf_dma->dma_address = sg_dma_address(skbuf_dma->sgl); + skbuf_dma->desc = dma_rx_desc; + dma_rx_desc->callback_param = lp; + dma_rx_desc->callback_result = axienet_dma_rx_cb; + dmaengine_submit(dma_rx_desc); + + return; + +rx_submit_err_unmap_skb: + dma_unmap_single(lp->dev, addr, lp->max_frm_size, DMA_FROM_DEVICE); +rx_submit_err_free_skb: + dev_kfree_skb(skb); +} + +/** + * axienet_init_dmaengine - init the dmaengine code. + * @ndev: Pointer to net_device structure + * + * Return: 0, on success. + * non-zero error value on failure + * + * This is the dmaengine initialization code. + */ +static int axienet_init_dmaengine(struct net_device *ndev) +{ + struct axienet_local *lp = netdev_priv(ndev); + struct skbuf_dma_descriptor *skbuf_dma; + int i, ret; + + lp->tx_chan = dma_request_chan(lp->dev, "tx_chan0"); + if (IS_ERR(lp->tx_chan)) { + dev_err(lp->dev, "No Ethernet DMA (TX) channel found\n"); + return PTR_ERR(lp->tx_chan); + } + + lp->rx_chan = dma_request_chan(lp->dev, "rx_chan0"); + if (IS_ERR(lp->rx_chan)) { + ret = PTR_ERR(lp->rx_chan); + dev_err(lp->dev, "No Ethernet DMA (RX) channel found\n"); + goto err_dma_release_tx; + } + + lp->tx_ring_tail = 0; + lp->tx_ring_head = 0; + lp->rx_ring_tail = 0; + lp->rx_ring_head = 0; + lp->tx_skb_ring = kcalloc(TX_BD_NUM_MAX, sizeof(*lp->tx_skb_ring), + GFP_KERNEL); + if (!lp->tx_skb_ring) { + ret = -ENOMEM; + goto err_dma_release_rx; + } + for (i = 0; i < TX_BD_NUM_MAX; i++) { + skbuf_dma = kzalloc(sizeof(*skbuf_dma), GFP_KERNEL); + if (!skbuf_dma) { + ret = -ENOMEM; + goto err_free_tx_skb_ring; + } + lp->tx_skb_ring[i] = skbuf_dma; + } + + lp->rx_skb_ring = kcalloc(RX_BUF_NUM_DEFAULT, sizeof(*lp->rx_skb_ring), + GFP_KERNEL); + if (!lp->rx_skb_ring) { + ret = -ENOMEM; + goto err_free_tx_skb_ring; + } + for (i = 0; i < RX_BUF_NUM_DEFAULT; i++) { + skbuf_dma = kzalloc(sizeof(*skbuf_dma), GFP_KERNEL); + if (!skbuf_dma) { + ret = -ENOMEM; + goto err_free_rx_skb_ring; + } + lp->rx_skb_ring[i] = skbuf_dma; + } + /* TODO: Instead of BD_NUM_DEFAULT use runtime support */ + for (i = 0; i < RX_BUF_NUM_DEFAULT; i++) + axienet_rx_submit_desc(ndev); + dma_async_issue_pending(lp->rx_chan); + + return 0; + +err_free_rx_skb_ring: + for (i = 0; i < RX_BUF_NUM_DEFAULT; i++) + kfree(lp->rx_skb_ring[i]); + kfree(lp->rx_skb_ring); +err_free_tx_skb_ring: + for (i = 0; i < TX_BD_NUM_MAX; i++) + kfree(lp->tx_skb_ring[i]); + kfree(lp->tx_skb_ring); +err_dma_release_rx: + dma_release_channel(lp->rx_chan); +err_dma_release_tx: + dma_release_channel(lp->tx_chan); + return ret; +} + +/** * axienet_init_legacy_dma - init the dma legacy code. * @ndev: Pointer to net_device structure * @@ -1216,7 +1532,19 @@ static int axienet_open(struct net_device *ndev) phylink_start(lp->phylink); - if (!lp->use_dmaengine) { + if (lp->use_dmaengine) { + /* Enable interrupts for Axi Ethernet core (if defined) */ + if (lp->eth_irq > 0) { + ret = request_irq(lp->eth_irq, axienet_eth_irq, IRQF_SHARED, + ndev->name, ndev); + if (ret) + goto err_phy; + } + + ret = axienet_init_dmaengine(ndev); + if (ret < 0) + goto err_free_eth_irq; + } else { ret = axienet_init_legacy_dma(ndev); if (ret) goto err_phy; @@ -1224,6 +1552,9 @@ static int axienet_open(struct net_device *ndev) return 0; +err_free_eth_irq: + if (lp->eth_irq > 0) + free_irq(lp->eth_irq, ndev); err_phy: phylink_stop(lp->phylink); phylink_disconnect_phy(lp->phylink); @@ -1243,6 +1574,7 @@ err_phy: static int axienet_stop(struct net_device *ndev) { struct axienet_local *lp = netdev_priv(ndev); + int i; dev_dbg(&ndev->dev, "axienet_close()\n"); @@ -1263,6 +1595,21 @@ static int axienet_stop(struct net_device *ndev) free_irq(lp->tx_irq, ndev); free_irq(lp->rx_irq, ndev); axienet_dma_bd_release(ndev); + } else { + dmaengine_terminate_sync(lp->tx_chan); + dmaengine_synchronize(lp->tx_chan); + dmaengine_terminate_sync(lp->rx_chan); + dmaengine_synchronize(lp->rx_chan); + + for (i = 0; i < TX_BD_NUM_MAX; i++) + kfree(lp->tx_skb_ring[i]); + kfree(lp->tx_skb_ring); + for (i = 0; i < RX_BUF_NUM_DEFAULT; i++) + kfree(lp->rx_skb_ring[i]); + kfree(lp->rx_skb_ring); + + dma_release_channel(lp->rx_chan); + dma_release_channel(lp->tx_chan); } axienet_iow(lp, XAE_IE_OFFSET, 0); @@ -1365,6 +1712,18 @@ static const struct net_device_ops axienet_netdev_ops = { #endif }; +static const struct net_device_ops axienet_netdev_dmaengine_ops = { + .ndo_open = axienet_open, + .ndo_stop = axienet_stop, + .ndo_start_xmit = axienet_start_xmit_dmaengine, + .ndo_get_stats64 = axienet_get_stats64, + .ndo_change_mtu = axienet_change_mtu, + .ndo_set_mac_address = netdev_set_mac_address, + .ndo_validate_addr = eth_validate_addr, + .ndo_eth_ioctl = axienet_ioctl, + .ndo_set_rx_mode = axienet_set_multicast_list, +}; + /** * axienet_ethtools_get_drvinfo - Get various Axi Ethernet driver information. * @ndev: Pointer to net_device structure @@ -1897,7 +2256,6 @@ static int axienet_probe(struct platform_device *pdev) SET_NETDEV_DEV(ndev, &pdev->dev); ndev->flags &= ~IFF_MULTICAST; /* clear multicast */ ndev->features = NETIF_F_SG; - ndev->netdev_ops = &axienet_netdev_ops; ndev->ethtool_ops = &axienet_ethtool_ops; /* MTU range: 64 - 9000 */ @@ -2118,8 +2476,39 @@ static int axienet_probe(struct platform_device *pdev) } netif_napi_add(ndev, &lp->napi_rx, axienet_rx_poll); netif_napi_add(ndev, &lp->napi_tx, axienet_tx_poll); + } else { + struct xilinx_vdma_config cfg; + struct dma_chan *tx_chan; + + lp->eth_irq = platform_get_irq_optional(pdev, 0); + if (lp->eth_irq < 0 && lp->eth_irq != -ENXIO) { + ret = lp->eth_irq; + goto cleanup_clk; + } + tx_chan = dma_request_chan(lp->dev, "tx_chan0"); + if (IS_ERR(tx_chan)) { + ret = PTR_ERR(tx_chan); + dev_err_probe(lp->dev, ret, "No Ethernet DMA (TX) channel found\n"); + goto cleanup_clk; + } + + cfg.reset = 1; + /* As name says VDMA but it has support for DMA channel reset */ + ret = xilinx_vdma_channel_set_config(tx_chan, &cfg); + if (ret < 0) { + dev_err(&pdev->dev, "Reset channel failed\n"); + dma_release_channel(tx_chan); + goto cleanup_clk; + } + + dma_release_channel(tx_chan); + lp->use_dmaengine = 1; } + if (lp->use_dmaengine) + ndev->netdev_ops = &axienet_netdev_dmaengine_ops; + else + ndev->netdev_ops = &axienet_netdev_ops; /* Check for Ethernet core IRQ (optional) */ if (lp->eth_irq <= 0) dev_info(&pdev->dev, "Ethernet core IRQ not defined\n"); |