From 52ad762b85ed7947ec9eff6b036eb985352f6874 Mon Sep 17 00:00:00 2001 From: Daniel Pieczko Date: Tue, 1 Apr 2014 13:10:34 +0100 Subject: Call efx_set_channels() before efx->type->dimension_resources() When using the "separate_tx_channels=1" module parameter, the TX queues are initially numbered starting from the first TX-only channel number (after all the RX-only channels). efx_set_channels() renumbers the queues so that they are indexed from zero. On EF10, the TX queues need to be relabelled in this way before calling the dimension_resources NIC type operation, otherwise the TX queue PIO buffers can be linked to the wrong VIs when using "separate_tx_channels=1". Added comments to explain UC/WC mappings for PIO buffers Signed-off-by: Shradha Shah Signed-off-by: David S. Miller --- drivers/net/ethernet/sfc/ef10.c | 7 +++++++ drivers/net/ethernet/sfc/efx.c | 3 ++- 2 files changed, 9 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c index 651626e133f9..21c20ea0dad0 100644 --- a/drivers/net/ethernet/sfc/ef10.c +++ b/drivers/net/ethernet/sfc/ef10.c @@ -565,10 +565,17 @@ static int efx_ef10_dimension_resources(struct efx_nic *efx) * several of each (in fact that's the only option if host * page size is >4K). So we may allocate some extra VIs just * for writing PIO buffers through. + * + * The UC mapping contains (min_vis - 1) complete VIs and the + * first half of the next VI. Then the WC mapping begins with + * the second half of this last VI. */ uc_mem_map_size = PAGE_ALIGN((min_vis - 1) * EFX_VI_PAGE_SIZE + ER_DZ_TX_PIOBUF); if (nic_data->n_piobufs) { + /* pio_write_vi_base rounds down to give the number of complete + * VIs inside the UC mapping. + */ pio_write_vi_base = uc_mem_map_size / EFX_VI_PAGE_SIZE; wc_mem_map_size = (PAGE_ALIGN((pio_write_vi_base + nic_data->n_piobufs) * diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index 52589f6a8beb..57b971e5e6b2 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -1599,6 +1599,8 @@ static int efx_probe_nic(struct efx_nic *efx) if (rc) goto fail1; + efx_set_channels(efx); + rc = efx->type->dimension_resources(efx); if (rc) goto fail2; @@ -1609,7 +1611,6 @@ static int efx_probe_nic(struct efx_nic *efx) efx->rx_indir_table[i] = ethtool_rxfh_indir_default(i, efx->rss_spread); - efx_set_channels(efx); netif_set_real_num_tx_queues(efx->net_dev, efx->n_tx_channels); netif_set_real_num_rx_queues(efx->net_dev, efx->n_rx_channels); -- cgit v1.2.3