net: systemport: log RX buffer allocation and RX/TX DMA failures

[deliverable/linux.git] / drivers / net / ethernet / broadcom / bcmsysport.c

diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
index 3a6778a667f4558f52f1327f413e088882490f7d..c1d255972daec6ab10f7da7c6ca097c28f78d698 100644 (file)
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -274,6 +274,9 @@ static const struct bcm_sysport_stats bcm_sysport_gstrings_stats[] = {
        /* RBUF misc statistics */
        STAT_RBUF("rbuf_ovflow_cnt", mib.rbuf_ovflow_cnt, RBUF_OVFL_DISC_CNTR),
        STAT_RBUF("rbuf_err_cnt", mib.rbuf_err_cnt, RBUF_ERR_PKT_CNTR),
+       STAT_MIB_RX("alloc_rx_buff_failed", mib.alloc_rx_buff_failed),
+       STAT_MIB_RX("rx_dma_failed", mib.rx_dma_failed),
+       STAT_MIB_TX("tx_dma_failed", mib.tx_dma_failed),
 };
 
 #define BCM_SYSPORT_STATS_LEN  ARRAY_SIZE(bcm_sysport_gstrings_stats)
@@ -477,6 +480,7 @@ static int bcm_sysport_rx_refill(struct bcm_sysport_priv *priv,
                                 RX_BUF_LENGTH, DMA_FROM_DEVICE);
        ret = dma_mapping_error(kdev, mapping);
        if (ret) {
+               priv->mib.rx_dma_failed++;
                bcm_sysport_free_cb(cb);
                netif_err(priv, rx_err, ndev, "DMA mapping failure\n");
                return ret;
@@ -526,6 +530,7 @@ static unsigned int bcm_sysport_desc_rx(struct bcm_sysport_priv *priv,
        unsigned int p_index;
        u16 len, status;
        struct bcm_rsb *rsb;
+       int ret;
 
        /* Determine how much we should process since last call */
        p_index = rdma_readl(priv, RDMA_PROD_INDEX);
@@ -620,7 +625,9 @@ static unsigned int bcm_sysport_desc_rx(struct bcm_sysport_priv *priv,
 
                napi_gro_receive(&priv->napi, skb);
 refill:
-               bcm_sysport_rx_refill(priv, cb);
+               ret = bcm_sysport_rx_refill(priv, cb);
+               if (ret)
+                       priv->mib.alloc_rx_buff_failed++;
        }
 
        return processed;
@@ -731,9 +738,11 @@ static int bcm_sysport_tx_poll(struct napi_struct *napi, int budget)
                napi_complete(napi);
                /* re-enable TX interrupt */
                intrl2_1_mask_clear(ring->priv, BIT(ring->index));
+
+               return 0;
        }
 
-       return 0;
+       return budget;
 }
 
 static void bcm_sysport_tx_reclaim_all(struct bcm_sysport_priv *priv)
@@ -971,6 +980,7 @@ static netdev_tx_t bcm_sysport_xmit(struct sk_buff *skb,
 
        mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE);
        if (dma_mapping_error(kdev, mapping)) {
+               priv->mib.tx_dma_failed++;
                netif_err(priv, tx_err, dev, "DMA map failed at %p (len=%d)\n",
                          skb->data, skb_len);
                ret = NETDEV_TX_OK;
@@ -1110,7 +1120,8 @@ static int bcm_sysport_init_tx_ring(struct bcm_sysport_priv *priv,
        /* We just need one DMA descriptor which is DMA-able, since writing to
         * the port will allocate a new descriptor in its internal linked-list
         */
-       p = dma_zalloc_coherent(kdev, 1, &ring->desc_dma, GFP_KERNEL);
+       p = dma_zalloc_coherent(kdev, sizeof(struct dma_desc), &ring->desc_dma,
+                               GFP_KERNEL);
        if (!p) {
                netif_err(priv, hw, priv->netdev, "DMA alloc failed\n");
                return -ENOMEM;
@@ -1174,6 +1185,13 @@ static void bcm_sysport_fini_tx_ring(struct bcm_sysport_priv *priv,
        if (!(reg & TDMA_DISABLED))
                netdev_warn(priv->netdev, "TDMA not stopped!\n");
 
+       /* ring->cbs is the last part in bcm_sysport_init_tx_ring which could
+        * fail, so by checking this pointer we know whether the TX ring was
+        * fully initialized or not.
+        */
+       if (!ring->cbs)
+               return;
+
        napi_disable(&ring->napi);
        netif_napi_del(&ring->napi);
 
@@ -1183,7 +1201,8 @@ static void bcm_sysport_fini_tx_ring(struct bcm_sysport_priv *priv,
        ring->cbs = NULL;
 
        if (ring->desc_dma) {
-               dma_free_coherent(kdev, 1, ring->desc_cpu, ring->desc_dma);
+               dma_free_coherent(kdev, sizeof(struct dma_desc),
+                                 ring->desc_cpu, ring->desc_dma);
                ring->desc_dma = 0;
        }
        ring->size = 0;