> From: Brian Norris [mailto:[email protected]] > > FYI, I have some more review comments because I'm trying to see why your > TX path doesn't work all that well. At least, it's not reporting things > correctly. (I know there's one ACK reporting bug you fixed in a > follow-up patch, but then, that patch is buggy too I think.) > > > +static int rtw_pci_xmit(struct rtw_dev *rtwdev, > > + struct rtw_tx_pkt_info *pkt_info, > > + struct sk_buff *skb, u8 queue) > > +{ > > + struct rtw_pci *rtwpci = (struct rtw_pci *)rtwdev->priv; > > + struct rtw_chip_info *chip = rtwdev->chip; > > + struct rtw_pci_tx_ring *ring; > > + struct rtw_pci_tx_data *tx_data; > > + dma_addr_t dma; > > + u32 tx_pkt_desc_sz = chip->tx_pkt_desc_sz; > > + u32 tx_buf_desc_sz = chip->tx_buf_desc_sz; > > + u32 size; > > + u32 psb_len; > > + u8 *pkt_desc; > > + struct rtw_pci_tx_buffer_desc *buf_desc; > > + u32 bd_idx; > > + > > + ring = &rtwpci->tx_rings[queue]; > > + > > + size = skb->len; > > + > > + if (queue == RTW_TX_QUEUE_BCN) > > + rtw_pci_release_rsvd_page(rtwpci, ring); > > + else if (!avail_desc(ring->r.wp, ring->r.rp, ring->r.len)) > > + return -ENOSPC; > > + > > + pkt_desc = skb_push(skb, chip->tx_pkt_desc_sz); > > + memset(pkt_desc, 0, tx_pkt_desc_sz); > > + pkt_info->qsel = rtw_pci_get_tx_qsel(skb, queue); > > + rtw_tx_fill_tx_desc(pkt_info, skb); > > + dma = pci_map_single(rtwpci->pdev, skb->data, skb->len, > > + PCI_DMA_TODEVICE); > > + if (pci_dma_mapping_error(rtwpci->pdev, dma)) > > + return -EBUSY; > > + > > + /* after this we got dma mapped, there is no way back */ > > + buf_desc = get_tx_buffer_desc(ring, tx_buf_desc_sz); > > + memset(buf_desc, 0, tx_buf_desc_sz); > > + psb_len = (skb->len - 1) / 128 + 1; > > + if (queue == RTW_TX_QUEUE_BCN) > > + psb_len |= 1 << RTK_PCI_TXBD_OWN_OFFSET; > > + > > + buf_desc[0].psb_len = cpu_to_le16(psb_len); > > + buf_desc[0].buf_size = cpu_to_le16(tx_pkt_desc_sz); > > + buf_desc[0].dma = cpu_to_le32(dma); > > + buf_desc[1].buf_size = cpu_to_le16(size); > > + buf_desc[1].dma = cpu_to_le32(dma + tx_pkt_desc_sz); > > + > > + tx_data = rtw_pci_get_tx_data(skb); > > + tx_data->dma = dma; > > + skb_queue_tail(&ring->queue, skb); > > IIUC, you have no locking for this queue. That seems like a bad idea. It > then gets pulled off this queue in your ISR, again without a lock. So > for example, if the only packet in your queue gets completed while you > are trying to queue another one, you might corrupt the list. >
I think skb_queue_tail already has its own spinlock to protect the queue? Cannot see why the list might be corrupted. Or I misunderstand you. Yan-Hsuan
