3.13-stable review patch. If anyone has any objections, please let me know.
------------------
From: Daniel Pieczko <dpieczko@xxxxxxxxxxxxxx>
[ Upstream commit 52ad762b85ed7947ec9eff6b036eb985352f6874 ]
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@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/sfc/ef10.c | 7 +++++++
drivers/net/ethernet/sfc/efx.c | 3 ++-
2 files changed, 9 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/sfc/ef10.c
+++ b/drivers/net/ethernet/sfc/ef10.c
@@ -555,10 +555,17 @@ static int efx_ef10_dimension_resources(
* 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) *
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -1514,6 +1514,8 @@ static int efx_probe_nic(struct efx_nic
if (rc)
goto fail1;
+ efx_set_channels(efx);
+
rc = efx->type->dimension_resources(efx);
if (rc)
goto fail2;
@@ -1524,7 +1526,6 @@ static int efx_probe_nic(struct efx_nic
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);
--
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