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net: bcmgenet: collect Rx discarded packet count
Bits 31:16 of RDMA_PROD_INDEX contain Rx discarded packet count, which are the Rx packets that had to be dropped by MAC hardware since there was no room on the Rx queue. Add code to collect this information into the netdev stats. Signed-off-by: Petri Gynther <pgynther@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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2 changed files with 19 additions and 0 deletions
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@ -1384,9 +1384,27 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_priv *priv,
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int len, err;
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unsigned int rxpktprocessed = 0, rxpkttoprocess;
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unsigned int p_index;
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unsigned int discards;
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unsigned int chksum_ok = 0;
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p_index = bcmgenet_rdma_ring_readl(priv, index, RDMA_PROD_INDEX);
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discards = (p_index >> DMA_P_INDEX_DISCARD_CNT_SHIFT) &
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DMA_P_INDEX_DISCARD_CNT_MASK;
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if (discards > ring->old_discards) {
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discards = discards - ring->old_discards;
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dev->stats.rx_missed_errors += discards;
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dev->stats.rx_errors += discards;
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ring->old_discards += discards;
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/* Clear HW register when we reach 75% of maximum 0xFFFF */
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if (ring->old_discards >= 0xC000) {
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ring->old_discards = 0;
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bcmgenet_rdma_ring_writel(priv, index, 0,
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RDMA_PROD_INDEX);
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}
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}
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p_index &= DMA_P_INDEX_MASK;
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if (likely(p_index >= ring->c_index))
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@ -548,6 +548,7 @@ struct bcmgenet_rx_ring {
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unsigned int read_ptr; /* Rx ring read pointer */
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unsigned int cb_ptr; /* Rx ring initial CB ptr */
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unsigned int end_ptr; /* Rx ring end CB ptr */
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unsigned int old_discards;
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};
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/* device context */
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