static int raw_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t size) { struct sock *sk = sock->sk; struct raw_sock *ro = raw_sk(sk); struct sk_buff *skb; struct net_device *dev; int ifindex; int err; if (msg->msg_name) { struct sockaddr_can *addr = (struct sockaddr_can *)msg->msg_name; if (addr->can_family != AF_CAN) return -EINVAL; ifindex = addr->can_ifindex; } else ifindex = ro->ifindex; if (size != sizeof(struct can_frame)) return -EINVAL; dev = dev_get_by_index(&init_net, ifindex); if (!dev) return -ENXIO; skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err); if (!skb) goto put_dev; err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); if (err < 0) goto free_skb; err = sock_tx_timestamp(msg, sk, skb_tx(skb)); if (err < 0) goto free_skb; skb->dev = dev; skb->sk = sk; err = can_send(skb, ro->loopback); dev_put(dev); if (err) goto send_failed; return size; free_skb: kfree_skb(skb); put_dev: dev_put(dev); send_failed: return err; }
static void bfin_tx_hwtstamp(struct net_device *netdev, struct sk_buff *skb) { struct bfin_mac_local *lp = netdev_priv(netdev); union skb_shared_tx *shtx = skb_tx(skb); if (shtx->hardware) { int timeout_cnt = MAX_TIMEOUT_CNT; /* When doing time stamping, keep the connection to the socket * a while longer */ shtx->in_progress = 1; /* * The timestamping is done at the EMAC module's MII/RMII interface * when the module sees the Start of Frame of an event message packet. This * interface is the closest possible place to the physical Ethernet transmission * medium, providing the best timing accuracy. */ while ((!(bfin_read_EMAC_PTP_ISTAT() & TXTL)) && (--timeout_cnt)) udelay(1); if (timeout_cnt == 0) printk(KERN_ERR DRV_NAME ": fails to timestamp the TX packet\n"); else { struct skb_shared_hwtstamps shhwtstamps; u64 ns; u64 regval; regval = bfin_read_EMAC_PTP_TXSNAPLO(); regval |= (u64)bfin_read_EMAC_PTP_TXSNAPHI() << 32; memset(&shhwtstamps, 0, sizeof(shhwtstamps)); ns = timecounter_cyc2time(&lp->clock, regval); timecompare_update(&lp->compare, ns); shhwtstamps.hwtstamp = ns_to_ktime(ns); shhwtstamps.syststamp = timecompare_transform(&lp->compare, ns); skb_tstamp_tx(skb, &shhwtstamps); bfin_dump_hwtamp("TX", &shhwtstamps.hwtstamp, &shhwtstamps.syststamp, &lp->compare); } } }
static int bfin_mac_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) { u16 *data; u32 data_align = (unsigned long)(skb->data) & 0x3; union skb_shared_tx *shtx = skb_tx(skb); current_tx_ptr->skb = skb; if (data_align == 0x2) { /* move skb->data to current_tx_ptr payload */ data = (u16 *)(skb->data) - 1; *data = (u16)(skb->len); /* * When transmitting an Ethernet packet, the PTP_TSYNC module requires * a DMA_Length_Word field associated with the packet. The lower 12 bits * of this field are the length of the packet payload in bytes and the higher * 4 bits are the timestamping enable field. */ if (shtx->hardware) *data |= 0x1000; current_tx_ptr->desc_a.start_addr = (u32)data; /* this is important! */ blackfin_dcache_flush_range((u32)data, (u32)((u8 *)data + skb->len + 4)); } else { *((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len); /* enable timestamping for the sent packet */ if (shtx->hardware) *((u16 *)(current_tx_ptr->packet)) |= 0x1000; memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data, skb->len); current_tx_ptr->desc_a.start_addr = (u32)current_tx_ptr->packet; if (current_tx_ptr->status.status_word != 0) current_tx_ptr->status.status_word = 0; blackfin_dcache_flush_range( (u32)current_tx_ptr->packet, (u32)(current_tx_ptr->packet + skb->len + 2)); } /* make sure the internal data buffers in the core are drained * so that the DMA descriptors are completely written when the * DMA engine goes to fetch them below */ SSYNC(); /* enable this packet's dma */ current_tx_ptr->desc_a.config |= DMAEN; /* tx dma is running, just return */ if (bfin_read_DMA2_IRQ_STATUS() & DMA_RUN) goto out; /* tx dma is not running */ bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a)); /* dma enabled, read from memory, size is 6 */ bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config); /* Turn on the EMAC tx */ bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE); out: adjust_tx_list(); bfin_tx_hwtstamp(dev, skb); current_tx_ptr = current_tx_ptr->next; dev->stats.tx_packets++; dev->stats.tx_bytes += (skb->len); return NETDEV_TX_OK; }