diff options
| author | Arthur Kiyanovski <akiyano@amazon.com> | 2020-07-21 16:38:08 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-07-21 15:59:04 -0700 |
| commit | 0f505c604e4ffd2ddc7cf06583ac169c443b8f68 (patch) | |
| tree | c3a20075c16c88d0e25cbbd96d4b80e0591ff3fe /drivers/net/ethernet/amazon/ena/ena_netdev.c | |
| parent | 0dcec68651f2162290750aae48fd7a0fdace0c66 (diff) | |
net: ena: add support for traffic mirroring
Add support for traffic mirroring, where the hardware reads the
buffer from the instance memory directly.
Traffic Mirroring needs access to the rx buffers in the instance.
To have this access, this patch:
1. Changes the code to map and unmap the rx buffers bidirectionally.
2. Enables the relevant bit in driver_supported_features to indicate
to the FW that this driver supports traffic mirroring.
Rx completion is not generated until mirroring is done to avoid
the situation where the driver changes the buffer before it is
mirrored.
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/amazon/ena/ena_netdev.c')
| -rw-r--r-- | drivers/net/ethernet/amazon/ena/ena_netdev.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c index d3d2e3934237..0563cb3125db 100644 --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c @@ -959,8 +959,11 @@ static int ena_alloc_rx_page(struct ena_ring *rx_ring, return -ENOMEM; } + /* To enable NIC-side port-mirroring, AKA SPAN port, + * we make the buffer readable from the nic as well + */ dma = dma_map_page(rx_ring->dev, page, 0, ENA_PAGE_SIZE, - DMA_FROM_DEVICE); + DMA_BIDIRECTIONAL); if (unlikely(dma_mapping_error(rx_ring->dev, dma))) { u64_stats_update_begin(&rx_ring->syncp); rx_ring->rx_stats.dma_mapping_err++; @@ -993,10 +996,9 @@ static void ena_free_rx_page(struct ena_ring *rx_ring, return; } - dma_unmap_page(rx_ring->dev, - ena_buf->paddr - rx_ring->rx_headroom, + dma_unmap_page(rx_ring->dev, ena_buf->paddr - rx_ring->rx_headroom, ENA_PAGE_SIZE, - DMA_FROM_DEVICE); + DMA_BIDIRECTIONAL); __free_page(page); rx_info->page = NULL; @@ -1431,7 +1433,7 @@ static struct sk_buff *ena_rx_skb(struct ena_ring *rx_ring, do { dma_unmap_page(rx_ring->dev, dma_unmap_addr(&rx_info->ena_buf, paddr), - ENA_PAGE_SIZE, DMA_FROM_DEVICE); + ENA_PAGE_SIZE, DMA_BIDIRECTIONAL); skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_info->page, rx_info->page_offset, len, ENA_PAGE_SIZE); @@ -3123,7 +3125,8 @@ static void ena_config_host_info(struct ena_com_dev *ena_dev, struct pci_dev *pd host_info->driver_supported_features = ENA_ADMIN_HOST_INFO_RX_OFFSET_MASK | - ENA_ADMIN_HOST_INFO_INTERRUPT_MODERATION_MASK; + ENA_ADMIN_HOST_INFO_INTERRUPT_MODERATION_MASK | + ENA_ADMIN_HOST_INFO_RX_BUF_MIRRORING_MASK; rc = ena_com_set_host_attributes(ena_dev); if (rc) { |