[TG3]: Add loopback test

The test will loopback one packet in MAC loopback mode and verify the
packet data.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 115 insertions, 0 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 49cb7b3e2835..2a771fd4c7cd 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -7576,6 +7576,117 @@ static int tg3_test_memory(struct tg3 *tp)
         return err;
 }
 
+static int tg3_test_loopback(struct tg3 *tp)
+{
+        u32 mac_mode, send_idx, rx_start_idx, rx_idx, tx_idx, opaque_key;
+        u32 desc_idx;
+        struct sk_buff *skb, *rx_skb;
+        u8 *tx_data;
+        dma_addr_t map;
+        int num_pkts, tx_len, rx_len, i, err;
+        struct tg3_rx_buffer_desc *desc;
+
+        if (!netif_running(tp->dev))
+                return -ENODEV;
+
+        err = -EIO;
+
+        tg3_abort_hw(tp, 1);
+
+        /* Clearing this flag to keep interrupts disabled */
+        tp->tg3_flags &= ~TG3_FLAG_INIT_COMPLETE;
+        tg3_reset_hw(tp);
+
+        mac_mode = (tp->mac_mode & ~MAC_MODE_PORT_MODE_MASK) |
+                   MAC_MODE_PORT_INT_LPBACK | MAC_MODE_LINK_POLARITY |
+                   MAC_MODE_PORT_MODE_GMII;
+        tw32(MAC_MODE, mac_mode);
+
+        tx_len = 1514;
+        skb = dev_alloc_skb(tx_len);
+        tx_data = skb_put(skb, tx_len);
+        memcpy(tx_data, tp->dev->dev_addr, 6);
+        memset(tx_data + 6, 0x0, 8);
+
+        tw32(MAC_RX_MTU_SIZE, tx_len + 4);
+
+        for (i = 14; i < tx_len; i++)
+                tx_data[i] = (u8) (i & 0xff);
+
+        map = pci_map_single(tp->pdev, skb->data, tx_len, PCI_DMA_TODEVICE);
+
+        tw32_f(HOSTCC_MODE, tp->coalesce_mode | HOSTCC_MODE_ENABLE |
+             HOSTCC_MODE_NOW);
+
+        udelay(10);
+
+        rx_start_idx = tp->hw_status->idx[0].rx_producer;
+
+        send_idx = 0;
+        num_pkts = 0;
+
+        tg3_set_txd(tp, send_idx, map, tx_len, 0, 1);
+
+        send_idx++;
+        num_pkts++;
+
+        tw32_tx_mbox(MAILBOX_SNDHOST_PROD_IDX_0 + TG3_64BIT_REG_LOW, send_idx);
+        tr32(MAILBOX_SNDHOST_PROD_IDX_0 + TG3_64BIT_REG_LOW);
+
+        udelay(10);
+
+        for (i = 0; i < 10; i++) {
+                tw32_f(HOSTCC_MODE, tp->coalesce_mode | HOSTCC_MODE_ENABLE |
+                       HOSTCC_MODE_NOW);
+
+                udelay(10);
+
+                tx_idx = tp->hw_status->idx[0].tx_consumer;
+                rx_idx = tp->hw_status->idx[0].rx_producer;
+                if ((tx_idx == send_idx) &&
+                    (rx_idx == (rx_start_idx + num_pkts)))
+                        break;
+        }
+
+        pci_unmap_single(tp->pdev, map, tx_len, PCI_DMA_TODEVICE);
+        dev_kfree_skb(skb);
+
+        if (tx_idx != send_idx)
+                goto out;
+
+        if (rx_idx != rx_start_idx + num_pkts)
+                goto out;
+
+        desc = &tp->rx_rcb[rx_start_idx];
+        desc_idx = desc->opaque & RXD_OPAQUE_INDEX_MASK;
+        opaque_key = desc->opaque & RXD_OPAQUE_RING_MASK;
+        if (opaque_key != RXD_OPAQUE_RING_STD)
+                goto out;
+
+        if ((desc->err_vlan & RXD_ERR_MASK) != 0 &&
+            (desc->err_vlan != RXD_ERR_ODD_NIBBLE_RCVD_MII))
+                goto out;
+
+        rx_len = ((desc->idx_len & RXD_LEN_MASK) >> RXD_LEN_SHIFT) - 4;
+        if (rx_len != tx_len)
+                goto out;
+
+        rx_skb = tp->rx_std_buffers[desc_idx].skb;
+
+        map = pci_unmap_addr(&tp->rx_std_buffers[desc_idx], mapping);
+        pci_dma_sync_single_for_cpu(tp->pdev, map, rx_len, PCI_DMA_FROMDEVICE);
+
+        for (i = 14; i < tx_len; i++) {
+                if (*(rx_skb->data + i) != (u8) (i & 0xff))
+                        goto out;
+        }
+        err = 0;
+        
+        /* tg3_free_rings will unmap and free the rx_skb */
+out:
+        return err;
+}
+
 static void tg3_self_test(struct net_device *dev, struct ethtool_test *etest,
                           u64 *data)
 {
@@ -7613,6 +7724,10 @@ static void tg3_self_test(struct net_device *dev, struct ethtool_test *etest,
                         etest->flags |= ETH_TEST_FL_FAILED;
                         data[3] = 1;
                 }
+                if (tg3_test_loopback(tp) != 0) {
+                        etest->flags |= ETH_TEST_FL_FAILED;
+                        data[4] = 1;
+                }
 
                 tg3_halt(tp, RESET_KIND_SHUTDOWN, 1);
                 if (netif_running(dev)) {