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network device No buffer Space
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amanns
Posts: 2
Hello i created Network driver that uses the uart port to send and recive. My driver works with some issues. I was able to ping but always afther a few pings i get
ping: sendmsg: No buffer space available driver
I checked the kernel logs but i could not see anything.
this is how i recive data:
struct stm32_port *stm32_port = netdev_priv(my_net); struct sk_buff *skb; unsigned char *dma_start; dma_start = stm32_port->rx_buf + (RX_BUF_L - stm32_port->last_res); print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1, dma_start, 16, true); skb = dev_alloc_skb(dma_size + 2); if (!skb) { if (printk_ratelimit( )) printk(KERN_NOTICE "snull rx: low on mem - packet dropped\n"); my_net->stats.rx_dropped++; //goto error; } memcpy(skb_put(skb, dma_size), dma_start, dma_size); /* Write metadata, and then pass to the receive level */ skb->dev = my_net; skb->protocol = eth_type_trans(skb, my_net); skb->ip_summed = CHECKSUM_NONE; // let the OS check the checksum my_net->stats.rx_packets++; my_net->stats.rx_bytes += dma_size; netif_rx(skb); port->icount.rx += dma_size; stm32_port->last_res -= dma_size; if (stm32_port->last_res == 0) stm32_port->last_res = RX_BUF_L; //dma_count
Here is how i send my data:
struct stm32_port *lp = netdev_priv(ndev); struct uart_port *port = &lp->port; struct sk_buff *sk_buff; struct dma_async_tx_descriptor *desc = NULL; struct stm32_usart_offsets *ofs = &lp->info->ofs; unsigned pktlen = skb->len; dma_cookie_t cookie; int ret = 0; //print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1, skb->data, 16, true); netif_stop_queue(ndev); sk_buff = skb_get(skb); if (ofs->icr == UNDEF_REG){ stm32_usart_clr_bits(port, ofs->isr, USART_SR_TC); }else{ writel_relaxed(USART_ICR_TCCF, port->membase + ofs->icr); } memcpy(&lp->tx_buf[0], sk_buff->data, pktlen); desc = dmaengine_prep_slave_single(lp->tx_ch, lp->tx_dma_buf, pktlen, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); if (!desc){ goto fallback_err; } cookie = dmaengine_submit(desc); ret = dma_submit_error(cookie); if (ret) { /* dma no yet started, safe to free resources */ dmaengine_terminate_async(lp->tx_ch); goto fallback_err; } /* Issue pending DMA TX requests */ dma_async_issue_pending(lp->tx_ch); stm32_usart_set_bits(port, ofs->cr3, USART_CR3_DMAT); /* rely on TXE irq (mask or unmask) for sending remaining data */ stm32_usart_tx_interrupt_disable(port); ndev->stats.tx_packets++; ndev->stats.tx_bytes += pktlen; fallback_err: skb_tx_timestamp(skb); dev_kfree_skb (skb); netif_start_queue(ndev); return NETDEV_TX_OK;
The error from the icmp always apears around 13 Pings when i start again same.
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