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sfc: fix XDP queues mode with legacy IRQ 

In systems without MSI-X capabilities, xdp_txq_queues_mode is calculated
in efx_allocate_msix_channels, but when enabling MSI-X fails, it was not
changed to a proper default value. This was leading to the driver
thinking that it has dedicated XDP queues, when it didn't.

Fix it by setting xdp_txq_queues_mode to the correct value if the driver
fallbacks to MSI or legacy IRQ mode. The correct value is
EFX_XDP_TX_QUEUES_BORROWED because there are no XDP dedicated queues.

The issue can be easily visible if the kernel is started with pci=nomsi,
then a call trace is shown. It is not shown only with sfc's modparam
interrupt_mode=2. Call trace example:
 WARNING: CPU: 2 PID: 663 at drivers/net/ethernet/sfc/efx_channels.c:828 efx_set_xdp_channels+0x124/0x260 [sfc]
 [...skip...]
 Call Trace:
  <TASK>
  efx_set_channels+0x5c/0xc0 [sfc]
  efx_probe_nic+0x9b/0x15a [sfc]
  efx_probe_all+0x10/0x1a2 [sfc]
  efx_pci_probe_main+0x12/0x156 [sfc]
  efx_pci_probe_post_io+0x18/0x103 [sfc]
  efx_pci_probe.cold+0x154/0x257 [sfc]
  local_pci_probe+0x42/0x80

Fixes: 6215b608a8 ("sfc: last resort fallback for lack of xdp tx queues")
Reported-by: Yanghang Liu <yanghliu@redhat.com>
Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
Acked-by: Martin Habets <habetsm.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Íñigo Huguet 2023-06-13 15:38:54 +02:00 committed by David S. Miller
parent 0c0cf3db83
commit e84a1e1e68
2 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/sfc/efx_channels.c
View File

@ -301,6 +301,7 @@ int efx_probe_interrupts(struct efx_nic *efx)
efx->tx_channel_offset = 0;
efx->n_xdp_channels = 0;
efx->xdp_channel_offset = efx->n_channels;
efx->xdp_txq_queues_mode = EFX_XDP_TX_QUEUES_BORROWED;
rc = pci_enable_msi(efx->pci_dev);
if (rc == 0) {
efx_get_channel(efx, 0)->irq = efx->pci_dev->irq;
@ -322,6 +323,7 @@ int efx_probe_interrupts(struct efx_nic *efx)
efx->tx_channel_offset = efx_separate_tx_channels ? 1 : 0;
efx->n_xdp_channels = 0;
efx->xdp_channel_offset = efx->n_channels;
efx->xdp_txq_queues_mode = EFX_XDP_TX_QUEUES_BORROWED;
efx->legacy_irq = efx->pci_dev->irq;
}

2
drivers/net/ethernet/sfc/siena/efx_channels.c
View File

@ -302,6 +302,7 @@ int efx_siena_probe_interrupts(struct efx_nic *efx)
efx->tx_channel_offset = 0;
efx->n_xdp_channels = 0;
efx->xdp_channel_offset = efx->n_channels;
efx->xdp_txq_queues_mode = EFX_XDP_TX_QUEUES_BORROWED;
rc = pci_enable_msi(efx->pci_dev);
if (rc == 0) {
efx_get_channel(efx, 0)->irq = efx->pci_dev->irq;
@ -323,6 +324,7 @@ int efx_siena_probe_interrupts(struct efx_nic *efx)
efx->tx_channel_offset = efx_siena_separate_tx_channels ? 1 : 0;
efx->n_xdp_channels = 0;
efx->xdp_channel_offset = efx->n_channels;
efx->xdp_txq_queues_mode = EFX_XDP_TX_QUEUES_BORROWED;
efx->legacy_irq = efx->pci_dev->irq;
}