diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c index ce40aa84588fe..bef5a944df599 100644 --- a/drivers/net/ethernet/realtek/rtase/rtase_main.c +++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c @@ -253,6 +253,68 @@ static void rtase_mark_to_asic(union rtase_rx_desc *desc, u32 rx_buf_sz) cpu_to_le32(RTASE_DESC_OWN | eor | rx_buf_sz)); } +static u32 rtase_tx_avail(struct rtase_ring *ring) +{ + return READ_ONCE(ring->dirty_idx) + RTASE_NUM_DESC - + READ_ONCE(ring->cur_idx); +} + +static int tx_handler(struct rtase_ring *ring, int budget) +{ + const struct rtase_private *tp = ring->ivec->tp; + struct net_device *dev = tp->dev; + u32 dirty_tx, tx_left; + u32 bytes_compl = 0; + u32 pkts_compl = 0; + int workdone = 0; + + dirty_tx = ring->dirty_idx; + tx_left = READ_ONCE(ring->cur_idx) - dirty_tx; + + while (tx_left > 0) { + u32 entry = dirty_tx % RTASE_NUM_DESC; + struct rtase_tx_desc *desc = ring->desc + + sizeof(struct rtase_tx_desc) * entry; + u32 status; + + status = le32_to_cpu(desc->opts1); + + if (status & RTASE_DESC_OWN) + break; + + rtase_unmap_tx_skb(tp->pdev, ring->mis.len[entry], desc); + ring->mis.len[entry] = 0; + if (ring->skbuff[entry]) { + pkts_compl++; + bytes_compl += ring->skbuff[entry]->len; + napi_consume_skb(ring->skbuff[entry], budget); + ring->skbuff[entry] = NULL; + } + + dirty_tx++; + tx_left--; + workdone++; + + if (workdone == RTASE_TX_BUDGET_DEFAULT) + break; + } + + if (ring->dirty_idx != dirty_tx) { + dev_sw_netstats_tx_add(dev, pkts_compl, bytes_compl); + WRITE_ONCE(ring->dirty_idx, dirty_tx); + + netif_subqueue_completed_wake(dev, ring->index, pkts_compl, + bytes_compl, + rtase_tx_avail(ring), + RTASE_TX_START_THRS); + + if (ring->cur_idx != dirty_tx) + rtase_w8(tp, RTASE_TPPOLL, BIT(ring->index)); + } + + return 0; +} + static void rtase_tx_desc_init(struct rtase_private *tp, u16 idx) { struct rtase_ring *ring = &tp->tx_ring[idx]; @@ -991,6 +1053,226 @@ static int rtase_close(struct net_device *dev) return 0; } +static u32 rtase_tx_vlan_tag(const struct rtase_private *tp, + const struct sk_buff *skb) +{ + return (skb_vlan_tag_present(skb)) ? + (RTASE_TX_VLAN_TAG | swab16(skb_vlan_tag_get(skb))) : 0x00; +} + +static u32 rtase_tx_csum(struct sk_buff *skb, const struct net_device *dev) +{ + u32 csum_cmd = 0; + u8 ip_protocol; + + switch (vlan_get_protocol(skb)) { + case htons(ETH_P_IP): + csum_cmd = RTASE_TX_IPCS_C; + ip_protocol = ip_hdr(skb)->protocol; + break; + + case htons(ETH_P_IPV6): + csum_cmd = RTASE_TX_IPV6F_C; + ip_protocol = ipv6_hdr(skb)->nexthdr; + break; + + default: + ip_protocol = IPPROTO_RAW; + break; + } + + if (ip_protocol == IPPROTO_TCP) + csum_cmd |= RTASE_TX_TCPCS_C; + else if (ip_protocol == IPPROTO_UDP) + csum_cmd |= RTASE_TX_UDPCS_C; + + csum_cmd |= u32_encode_bits(skb_transport_offset(skb), + RTASE_TCPHO_MASK); + + return csum_cmd; +} + +static int rtase_xmit_frags(struct rtase_ring *ring, struct sk_buff *skb, + u32 opts1, u32 opts2) +{ + const struct skb_shared_info *info = skb_shinfo(skb); + const struct rtase_private *tp = ring->ivec->tp; + const u8 nr_frags = info->nr_frags; + struct rtase_tx_desc *txd = NULL; + u32 cur_frag, entry; + + entry = ring->cur_idx; + for (cur_frag = 0; cur_frag < nr_frags; cur_frag++) { + const skb_frag_t *frag = &info->frags[cur_frag]; + dma_addr_t mapping; + u32 status, len; + void *addr; + + entry = (entry + 1) % RTASE_NUM_DESC; + + txd = ring->desc + sizeof(struct rtase_tx_desc) * entry; + len = skb_frag_size(frag); + addr = skb_frag_address(frag); + mapping = dma_map_single(&tp->pdev->dev, addr, len, + DMA_TO_DEVICE); + + if (unlikely(dma_mapping_error(&tp->pdev->dev, mapping))) { + if (unlikely(net_ratelimit())) + netdev_err(tp->dev, + "Failed to map TX fragments DMA!\n"); + + goto err_out; + } + + if (((entry + 1) % RTASE_NUM_DESC) == 0) + status = (opts1 | len | RTASE_RING_END); + else + status = opts1 | len; + + if (cur_frag == (nr_frags - 1)) { + ring->skbuff[entry] = skb; + status |= RTASE_TX_LAST_FRAG; + } + + ring->mis.len[entry] = len; + txd->addr = cpu_to_le64(mapping); + txd->opts2 = cpu_to_le32(opts2); + + /* make sure the operating fields have been updated */ + dma_wmb(); + txd->opts1 = cpu_to_le32(status); + } + + return cur_frag; + +err_out: + rtase_tx_clear_range(ring, ring->cur_idx + 1, cur_frag); + return -EIO; +} + +static netdev_tx_t rtase_start_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct skb_shared_info *shinfo = skb_shinfo(skb); + struct rtase_private *tp = netdev_priv(dev); + u32 q_idx, entry, len, opts1, opts2; + struct netdev_queue *tx_queue; + bool stop_queue, door_bell; + u32 mss = shinfo->gso_size; + struct rtase_tx_desc *txd; + struct rtase_ring *ring; + dma_addr_t mapping; + int frags; + + /* multiqueues */ + q_idx = skb_get_queue_mapping(skb); + ring = &tp->tx_ring[q_idx]; + tx_queue = netdev_get_tx_queue(dev, q_idx); + + if (unlikely(!rtase_tx_avail(ring))) { + if (net_ratelimit()) + netdev_err(dev, + "BUG! Tx Ring full when queue awake!\n"); + + netif_stop_queue(dev); + return NETDEV_TX_BUSY; + } + + entry = ring->cur_idx % RTASE_NUM_DESC; + txd = ring->desc + sizeof(struct rtase_tx_desc) * entry; + + opts1 = RTASE_DESC_OWN; + opts2 = rtase_tx_vlan_tag(tp, skb); + + /* tcp segmentation offload (or tcp large send) */ + if (mss) { + if (shinfo->gso_type & SKB_GSO_TCPV4) { + opts1 |= RTASE_GIANT_SEND_V4; + } else if (shinfo->gso_type & SKB_GSO_TCPV6) { + if (skb_cow_head(skb, 0)) + goto err_dma_0; + + tcp_v6_gso_csum_prep(skb); + opts1 |= RTASE_GIANT_SEND_V6; + } else { + WARN_ON_ONCE(1); + } + + opts1 |= u32_encode_bits(skb_transport_offset(skb), + RTASE_TCPHO_MASK); + opts2 |= u32_encode_bits(mss, RTASE_MSS_MASK); + } else if (skb->ip_summed == CHECKSUM_PARTIAL) { + opts2 |= rtase_tx_csum(skb, dev); + } + + frags = rtase_xmit_frags(ring, skb, opts1, opts2); + if (unlikely(frags < 0)) + goto err_dma_0; + + if (frags) { + len = skb_headlen(skb); + opts1 |= RTASE_TX_FIRST_FRAG; + } else { + len = skb->len; + ring->skbuff[entry] = skb; + opts1 |= RTASE_TX_FIRST_FRAG | RTASE_TX_LAST_FRAG; + } + + if (((entry + 1) % RTASE_NUM_DESC) == 0) + opts1 |= (len | RTASE_RING_END); + else + opts1 |= len; + + mapping = dma_map_single(&tp->pdev->dev, skb->data, len, + DMA_TO_DEVICE); + + if (unlikely(dma_mapping_error(&tp->pdev->dev, mapping))) { + if (unlikely(net_ratelimit())) + netdev_err(dev, "Failed to map TX DMA!\n"); + + goto err_dma_1; + } + + ring->mis.len[entry] = len; + txd->addr = cpu_to_le64(mapping); + txd->opts2 = cpu_to_le32(opts2); + txd->opts1 = cpu_to_le32(opts1 & ~RTASE_DESC_OWN); + + /* make sure the operating fields have been updated */ + dma_wmb(); + + door_bell = __netdev_tx_sent_queue(tx_queue, skb->len, + netdev_xmit_more()); + + txd->opts1 = cpu_to_le32(opts1); + + skb_tx_timestamp(skb); + + /* tx needs to see descriptor changes before updated cur_idx */ + smp_wmb(); + + WRITE_ONCE(ring->cur_idx, ring->cur_idx + frags + 1); + + stop_queue = !netif_subqueue_maybe_stop(dev, ring->index, + rtase_tx_avail(ring), + RTASE_TX_STOP_THRS, + RTASE_TX_START_THRS); + + if (door_bell || stop_queue) + rtase_w8(tp, RTASE_TPPOLL, BIT(ring->index)); + + return NETDEV_TX_OK; + +err_dma_1: + ring->skbuff[entry] = NULL; + rtase_tx_clear_range(ring, ring->cur_idx + 1, frags); + +err_dma_0: + tp->stats.tx_dropped++; + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; +} + static void rtase_enable_eem_write(const struct rtase_private *tp) { u8 val; @@ -1026,6 +1308,7 @@ static void rtase_rar_set(const struct rtase_private *tp, const u8 *addr) static const struct net_device_ops rtase_netdev_ops = { .ndo_open = rtase_open, .ndo_stop = rtase_close, + .ndo_start_xmit = rtase_start_xmit, }; static void rtase_get_mac_address(struct net_device *dev)