diff mbox

[net] Call efx_set_channels() before efx->type->dimension_resources()

Message ID 533AACBA.3020807@solarflare.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Shradha Shah April 1, 2014, 12:10 p.m. UTC 
From: Daniel Pieczko <dpieczko@solarflare.com>

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 <sshah@solarflare.com>
---
This bug fix is needed for all versions supporting EF10
i.e all versions including and after 3.12.
---
 drivers/net/ethernet/sfc/ef10.c |    7 +++++++
 drivers/net/ethernet/sfc/efx.c  |    3 ++-
 2 files changed, 9 insertions(+), 1 deletions(-)

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Comments

David Miller April 1, 2014, 8:27 p.m. UTC | #1 
From: Shradha Shah <sshah@solarflare.com>
Date: Tue, 1 Apr 2014 13:10:34 +0100

> From: Daniel Pieczko <dpieczko@solarflare.com>
> 
> 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 <sshah@solarflare.com>

Applied and queued up for -stable.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
index 174a92f..7645a3c 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 83d4643..f06c790 100644
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -1603,6 +1603,8 @@  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;
@@ -1613,7 +1615,6 @@  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);