From 63bb0e89fa4d6444570ee979085e2504e193026e Mon Sep 17 00:00:00 2001 From: Petr Oros Date: Mon, 23 Nov 2020 17:17:00 +0100 Subject: [PATCH 74/78] net: ena: add support for traffic mirroring Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1861967 Upstream commit(s): commit 0f505c604e4ffd2ddc7cf06583ac169c443b8f68 Author: Arthur Kiyanovski Date: Tue Jul 21 16:38:08 2020 +0300 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 Signed-off-by: David S. Miller Signed-off-by: Petr Oros --- drivers/net/ethernet/amazon/ena/ena_admin_defs.h | 5 ++++- drivers/net/ethernet/amazon/ena/ena_netdev.c | 15 +++++++++------ 2 files changed, 13 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/amazon/ena/ena_admin_defs.h b/drivers/net/ethernet/amazon/ena/ena_admin_defs.h index 336742f6e3c3..afe87ff09b20 100644 --- a/drivers/net/ethernet/amazon/ena/ena_admin_defs.h +++ b/drivers/net/ethernet/amazon/ena/ena_admin_defs.h @@ -816,7 +816,8 @@ struct ena_admin_host_info { /* 0 : reserved * 1 : rx_offset * 2 : interrupt_moderation - * 31:3 : reserved + * 3 : rx_buf_mirroring + * 31:4 : reserved */ u32 driver_supported_features; }; @@ -1129,6 +1130,8 @@ struct ena_admin_ena_mmio_req_read_less_resp { #define ENA_ADMIN_HOST_INFO_RX_OFFSET_MASK BIT(1) #define ENA_ADMIN_HOST_INFO_INTERRUPT_MODERATION_SHIFT 2 #define ENA_ADMIN_HOST_INFO_INTERRUPT_MODERATION_MASK BIT(2) +#define ENA_ADMIN_HOST_INFO_RX_BUF_MIRRORING_SHIFT 3 +#define ENA_ADMIN_HOST_INFO_RX_BUF_MIRRORING_MASK BIT(3) /* aenq_common_desc */ #define ENA_ADMIN_AENQ_COMMON_DESC_PHASE_MASK BIT(0) diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c index 2f53b805940a..dd7cc71f85d4 100644 --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c @@ -960,8 +960,11 @@ 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++; @@ -994,10 +997,9 @@ 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; @@ -1432,7 +1434,7 @@ 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); @@ -3125,7 +3127,8 @@ 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) { -- 2.13.6