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sfc: fix wrong tx channel offset with efx_separate_tx_channels 

tx_channel_offset is calculated in efx_allocate_msix_channels, but it is
also calculated again in efx_set_channels because it was originally done
there, and when efx_allocate_msix_channels was introduced it was
forgotten to be removed from efx_set_channels.

Moreover, the old calculation is wrong when using
efx_separate_tx_channels because now we can have XDP channels after the
TX channels, so n_channels - n_tx_channels doesn't point to the first TX
channel.

Remove the old calculation from efx_set_channels, and add the
initialization of this variable if MSI or legacy interrupts are used,
next to the initialization of the rest of the related variables, where
it was missing.

Fixes: 3990a8fffb ("sfc: allocate channels for XDP tx queues")
Reported-by: Tianhao Zhao <tizhao@redhat.com>
Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Íñigo Huguet 2022-05-27 10:05:29 +02:00 committed by David S. Miller
parent 2e102b53f8
commit c308dfd1b4
1 changed files with 2 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/ethernet/sfc/efx_channels.c
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@ -298,6 +298,7 @@ int efx_probe_interrupts(struct efx_nic *efx)
efx->n_channels = 1; efx->n_channels = 1;
efx->n_rx_channels = 1; efx->n_rx_channels = 1;
efx->n_tx_channels = 1; efx->n_tx_channels = 1;
efx->tx_channel_offset = 0;
efx->n_xdp_channels = 0; efx->n_xdp_channels = 0;
efx->xdp_channel_offset = efx->n_channels; efx->xdp_channel_offset = efx->n_channels;
rc = pci_enable_msi(efx->pci_dev); rc = pci_enable_msi(efx->pci_dev);
@ -318,6 +319,7 @@ int efx_probe_interrupts(struct efx_nic *efx)
efx->n_channels = 1 + (efx_separate_tx_channels ? 1 : 0); efx->n_channels = 1 + (efx_separate_tx_channels ? 1 : 0);
efx->n_rx_channels = 1; efx->n_rx_channels = 1;
efx->n_tx_channels = 1; efx->n_tx_channels = 1;
efx->tx_channel_offset = 1;
efx->n_xdp_channels = 0; efx->n_xdp_channels = 0;
efx->xdp_channel_offset = efx->n_channels; efx->xdp_channel_offset = efx->n_channels;
efx->legacy_irq = efx->pci_dev->irq; efx->legacy_irq = efx->pci_dev->irq;
@ -954,10 +956,6 @@ int efx_set_channels(struct efx_nic *efx)
struct efx_channel *channel; struct efx_channel *channel;
int rc; int rc;
efx->tx_channel_offset =
efx_separate_tx_channels ?
efx->n_channels - efx->n_tx_channels : 0;
if (efx->xdp_tx_queue_count) { if (efx->xdp_tx_queue_count) {
EFX_WARN_ON_PARANOID(efx->xdp_tx_queues); EFX_WARN_ON_PARANOID(efx->xdp_tx_queues);