sfc: Extend struct efx_tx_buffer to allow pushing option descriptors

The TX path firmware for EF10 supports 'option descriptors' to control
offloads and various other features.  Add a flag and field for these
in struct efx_tx_buffer, and don't treat them as DMA descriptors on
completion.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
index 85ee647b28ad..82075f9f02e6 100644
--- a/drivers/net/ethernet/sfc/tx.c
+++ b/drivers/net/ethernet/sfc/tx.c
@@ -306,7 +306,9 @@ static void efx_dequeue_buffers(struct efx_tx_queue *tx_queue,
 
         while (read_ptr != stop_index) {
                 struct efx_tx_buffer *buffer = &tx_queue->buffer[read_ptr];
-                if (unlikely(buffer->len == 0)) {
+
+                if (!(buffer->flags & EFX_TX_BUF_OPTION) &&
+                    unlikely(buffer->len == 0)) {
                         netif_err(efx, tx_err, efx->net_dev,
                                   "TX queue %d spurious TX completion id %x\n",
                                   tx_queue->queue, read_ptr);