Welcome to the Linux Foundation Forum!
network device No buffer Space

amanns
Posts: 3
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.
0
Categories
- All Categories
- 143 LFX Mentorship
- 143 LFX Mentorship: Linux Kernel
- 817 Linux Foundation IT Professional Programs
- 368 Cloud Engineer IT Professional Program
- 167 Advanced Cloud Engineer IT Professional Program
- 83 DevOps Engineer IT Professional Program
- 132 Cloud Native Developer IT Professional Program
- 122 Express Training Courses
- 122 Express Courses - Discussion Forum
- Microlearning - Discussion Forum
- 6.6K Training Courses
- 40 LFC110 Class Forum - Discontinued
- 66 LFC131 Class Forum
- 39 LFD102 Class Forum
- 237 LFD103 Class Forum
- 22 LFD110 Class Forum
- 44 LFD121 Class Forum
- 1 LFD123 Class Forum
- LFD125 Class Forum
- 17 LFD133 Class Forum
- 9 LFD134 Class Forum
- 17 LFD137 Class Forum
- 70 LFD201 Class Forum
- 3 LFD210 Class Forum
- 2 LFD210-CN Class Forum
- 2 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum - Discontinued
- 1 LFD233 Class Forum
- 3 LFD237 Class Forum
- 23 LFD254 Class Forum
- 689 LFD259 Class Forum
- 110 LFD272 Class Forum
- 3 LFD272-JP クラス フォーラム
- 10 LFD273 Class Forum
- 251 LFS101 Class Forum
- 2 LFS111 Class Forum
- 3 LFS112 Class Forum
- 3 LFS116 Class Forum
- 3 LFS118 Class Forum
- 1 LFS120 Class Forum
- 3 LFS142 Class Forum
- 3 LFS144 Class Forum
- 3 LFS145 Class Forum
- 1 LFS146 Class Forum
- 16 LFS148 Class Forum
- 8 LFS151 Class Forum
- 1 LFS157 Class Forum
- 70 LFS158 Class Forum
- LFS158-JP クラス フォーラム
- 5 LFS162 Class Forum
- 1 LFS166 Class Forum
- 3 LFS167 Class Forum
- 1 LFS170 Class Forum
- 1 LFS171 Class Forum
- 2 LFS178 Class Forum
- 2 LFS180 Class Forum
- 2 LFS182 Class Forum
- 4 LFS183 Class Forum
- 30 LFS200 Class Forum
- 737 LFS201 Class Forum - Discontinued
- 2 LFS201-JP クラス フォーラム
- 17 LFS203 Class Forum
- 118 LFS207 Class Forum
- 2 LFS207-DE-Klassenforum
- LFS207-JP クラス フォーラム
- 302 LFS211 Class Forum
- 55 LFS216 Class Forum
- 54 LFS241 Class Forum
- 43 LFS242 Class Forum
- 37 LFS243 Class Forum
- 13 LFS244 Class Forum
- 6 LFS245 Class Forum
- LFS246 Class Forum
- LFS248 Class Forum
- 110 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- LFS251 Class Forum
- 145 LFS253 Class Forum
- LFS254 Class Forum
- 2 LFS255 Class Forum
- 13 LFS256 Class Forum
- 1 LFS257 Class Forum
- 1.3K LFS258 Class Forum
- 11 LFS258-JP クラス フォーラム
- 116 LFS260 Class Forum
- 156 LFS261 Class Forum
- 41 LFS262 Class Forum
- 82 LFS263 Class Forum - Discontinued
- 15 LFS264 Class Forum - Discontinued
- 11 LFS266 Class Forum - Discontinued
- 23 LFS267 Class Forum
- 25 LFS268 Class Forum
- 29 LFS269 Class Forum
- 7 LFS270 Class Forum
- 200 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- 2 LFS147 Class Forum
- LFS274 Class Forum
- 3 LFS281 Class Forum
- 18 LFW111 Class Forum
- 262 LFW211 Class Forum
- 179 LFW212 Class Forum
- 15 SKF100 Class Forum
- SKF200 Class Forum
- 2 SKF201 Class Forum
- 791 Hardware
- 199 Drivers
- 68 I/O Devices
- 37 Monitors
- 98 Multimedia
- 174 Networking
- 91 Printers & Scanners
- 85 Storage
- 754 Linux Distributions
- 82 Debian
- 67 Fedora
- 16 Linux Mint
- 13 Mageia
- 23 openSUSE
- 149 Red Hat Enterprise
- 31 Slackware
- 13 SUSE Enterprise
- 351 Ubuntu
- 465 Linux System Administration
- 39 Cloud Computing
- 71 Command Line/Scripting
- Github systems admin projects
- 95 Linux Security
- 78 Network Management
- 101 System Management
- 47 Web Management
- 56 Mobile Computing
- 18 Android
- 28 Development
- 1.2K New to Linux
- 1K Getting Started with Linux
- 366 Off Topic
- 114 Introductions
- 171 Small Talk
- 26 Study Material
- 534 Programming and Development
- 304 Kernel Development
- 223 Software Development
- 1.8K Software
- 212 Applications
- 182 Command Line
- 3 Compiling/Installing
- 405 Games
- 311 Installation
- 79 All In Program
- 79 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)