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can: dev: move skb related into seperate file
This patch moves the skb related code of the CAN device infrastructure into a separate file. Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr> Link: https://lore.kernel.org/r/20210111141930.693847-6-mkl@pengutronix.de Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,220 @@ | ||
| // SPDX-License-Identifier: GPL-2.0-only | ||
| /* Copyright (C) 2005 Marc Kleine-Budde, Pengutronix | ||
| * Copyright (C) 2006 Andrey Volkov, Varma Electronics | ||
| * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com> | ||
| */ | ||
|
|
||
| #include <linux/can/dev.h> | ||
|
|
||
| /* Local echo of CAN messages | ||
| * | ||
| * CAN network devices *should* support a local echo functionality | ||
| * (see Documentation/networking/can.rst). To test the handling of CAN | ||
| * interfaces that do not support the local echo both driver types are | ||
| * implemented. In the case that the driver does not support the echo | ||
| * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core | ||
| * to perform the echo as a fallback solution. | ||
| */ | ||
| void can_flush_echo_skb(struct net_device *dev) | ||
| { | ||
| struct can_priv *priv = netdev_priv(dev); | ||
| struct net_device_stats *stats = &dev->stats; | ||
| int i; | ||
|
|
||
| for (i = 0; i < priv->echo_skb_max; i++) { | ||
| if (priv->echo_skb[i]) { | ||
| kfree_skb(priv->echo_skb[i]); | ||
| priv->echo_skb[i] = NULL; | ||
| stats->tx_dropped++; | ||
| stats->tx_aborted_errors++; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /* Put the skb on the stack to be looped backed locally lateron | ||
| * | ||
| * The function is typically called in the start_xmit function | ||
| * of the device driver. The driver must protect access to | ||
| * priv->echo_skb, if necessary. | ||
| */ | ||
| int can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, | ||
| unsigned int idx) | ||
| { | ||
| struct can_priv *priv = netdev_priv(dev); | ||
|
|
||
| BUG_ON(idx >= priv->echo_skb_max); | ||
|
|
||
| /* check flag whether this packet has to be looped back */ | ||
| if (!(dev->flags & IFF_ECHO) || skb->pkt_type != PACKET_LOOPBACK || | ||
| (skb->protocol != htons(ETH_P_CAN) && | ||
| skb->protocol != htons(ETH_P_CANFD))) { | ||
| kfree_skb(skb); | ||
| return 0; | ||
| } | ||
|
|
||
| if (!priv->echo_skb[idx]) { | ||
| skb = can_create_echo_skb(skb); | ||
| if (!skb) | ||
| return -ENOMEM; | ||
|
|
||
| /* make settings for echo to reduce code in irq context */ | ||
| skb->pkt_type = PACKET_BROADCAST; | ||
| skb->ip_summed = CHECKSUM_UNNECESSARY; | ||
| skb->dev = dev; | ||
|
|
||
| /* save this skb for tx interrupt echo handling */ | ||
| priv->echo_skb[idx] = skb; | ||
| } else { | ||
| /* locking problem with netif_stop_queue() ?? */ | ||
| netdev_err(dev, "%s: BUG! echo_skb %d is occupied!\n", __func__, idx); | ||
| kfree_skb(skb); | ||
| return -EBUSY; | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
| EXPORT_SYMBOL_GPL(can_put_echo_skb); | ||
|
|
||
| struct sk_buff * | ||
| __can_get_echo_skb(struct net_device *dev, unsigned int idx, u8 *len_ptr) | ||
| { | ||
| struct can_priv *priv = netdev_priv(dev); | ||
|
|
||
| if (idx >= priv->echo_skb_max) { | ||
| netdev_err(dev, "%s: BUG! Trying to access can_priv::echo_skb out of bounds (%u/max %u)\n", | ||
| __func__, idx, priv->echo_skb_max); | ||
| return NULL; | ||
| } | ||
|
|
||
| if (priv->echo_skb[idx]) { | ||
| /* Using "struct canfd_frame::len" for the frame | ||
| * length is supported on both CAN and CANFD frames. | ||
| */ | ||
| struct sk_buff *skb = priv->echo_skb[idx]; | ||
| struct canfd_frame *cf = (struct canfd_frame *)skb->data; | ||
|
|
||
| /* get the real payload length for netdev statistics */ | ||
| if (cf->can_id & CAN_RTR_FLAG) | ||
| *len_ptr = 0; | ||
| else | ||
| *len_ptr = cf->len; | ||
|
|
||
| priv->echo_skb[idx] = NULL; | ||
|
|
||
| return skb; | ||
| } | ||
|
|
||
| return NULL; | ||
| } | ||
|
|
||
| /* Get the skb from the stack and loop it back locally | ||
| * | ||
| * The function is typically called when the TX done interrupt | ||
| * is handled in the device driver. The driver must protect | ||
| * access to priv->echo_skb, if necessary. | ||
| */ | ||
| unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx) | ||
| { | ||
| struct sk_buff *skb; | ||
| u8 len; | ||
|
|
||
| skb = __can_get_echo_skb(dev, idx, &len); | ||
| if (!skb) | ||
| return 0; | ||
|
|
||
| skb_get(skb); | ||
| if (netif_rx(skb) == NET_RX_SUCCESS) | ||
| dev_consume_skb_any(skb); | ||
| else | ||
| dev_kfree_skb_any(skb); | ||
|
|
||
| return len; | ||
| } | ||
| EXPORT_SYMBOL_GPL(can_get_echo_skb); | ||
|
|
||
| /* Remove the skb from the stack and free it. | ||
| * | ||
| * The function is typically called when TX failed. | ||
| */ | ||
| void can_free_echo_skb(struct net_device *dev, unsigned int idx) | ||
| { | ||
| struct can_priv *priv = netdev_priv(dev); | ||
|
|
||
| BUG_ON(idx >= priv->echo_skb_max); | ||
|
|
||
| if (priv->echo_skb[idx]) { | ||
| dev_kfree_skb_any(priv->echo_skb[idx]); | ||
| priv->echo_skb[idx] = NULL; | ||
| } | ||
| } | ||
| EXPORT_SYMBOL_GPL(can_free_echo_skb); | ||
|
|
||
| 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_skb_priv) + | ||
| sizeof(struct can_frame)); | ||
| if (unlikely(!skb)) | ||
| return NULL; | ||
|
|
||
| skb->protocol = htons(ETH_P_CAN); | ||
| skb->pkt_type = PACKET_BROADCAST; | ||
| skb->ip_summed = CHECKSUM_UNNECESSARY; | ||
|
|
||
| skb_reset_mac_header(skb); | ||
| skb_reset_network_header(skb); | ||
| skb_reset_transport_header(skb); | ||
|
|
||
| can_skb_reserve(skb); | ||
| can_skb_prv(skb)->ifindex = dev->ifindex; | ||
| can_skb_prv(skb)->skbcnt = 0; | ||
|
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||
| *cf = skb_put_zero(skb, sizeof(struct can_frame)); | ||
|
|
||
| return skb; | ||
| } | ||
| EXPORT_SYMBOL_GPL(alloc_can_skb); | ||
|
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||
| struct sk_buff *alloc_canfd_skb(struct net_device *dev, | ||
| struct canfd_frame **cfd) | ||
| { | ||
| struct sk_buff *skb; | ||
|
|
||
| skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) + | ||
| sizeof(struct canfd_frame)); | ||
| if (unlikely(!skb)) | ||
| return NULL; | ||
|
|
||
| skb->protocol = htons(ETH_P_CANFD); | ||
| skb->pkt_type = PACKET_BROADCAST; | ||
| skb->ip_summed = CHECKSUM_UNNECESSARY; | ||
|
|
||
| skb_reset_mac_header(skb); | ||
| skb_reset_network_header(skb); | ||
| skb_reset_transport_header(skb); | ||
|
|
||
| can_skb_reserve(skb); | ||
| can_skb_prv(skb)->ifindex = dev->ifindex; | ||
| can_skb_prv(skb)->skbcnt = 0; | ||
|
|
||
| *cfd = skb_put_zero(skb, sizeof(struct canfd_frame)); | ||
|
|
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| return skb; | ||
| } | ||
| EXPORT_SYMBOL_GPL(alloc_canfd_skb); | ||
|
|
||
| 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; | ||
|
|
||
| (*cf)->can_id = CAN_ERR_FLAG; | ||
| (*cf)->len = CAN_ERR_DLC; | ||
|
|
||
| return skb; | ||
| } | ||
| EXPORT_SYMBOL_GPL(alloc_can_err_skb); |
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