sfc: Stop TX queues before they fill up

We now have a definite upper bound on the number of descriptors per
skb; use that to stop the queue when the next packet might not fit.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 0ac01fa6e63c..28a6d6258692 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -665,6 +665,8 @@ struct vfdi_status;
  *      should be allocated for this NIC
  * @rxq_entries: Size of receive queues requested by user.
  * @txq_entries: Size of transmit queues requested by user.
+ * @txq_stop_thresh: TX queue fill level at or above which we stop it.
+ * @txq_wake_thresh: TX queue fill level at or below which we wake it.
  * @tx_dc_base: Base qword address in SRAM of TX queue descriptor caches
  * @rx_dc_base: Base qword address in SRAM of RX queue descriptor caches
  * @sram_lim_qw: Qword address limit of SRAM
@@ -775,6 +777,9 @@ struct efx_nic {
 
         unsigned rxq_entries;
         unsigned txq_entries;
+        unsigned int txq_stop_thresh;
+        unsigned int txq_wake_thresh;
+
         unsigned tx_dc_base;
         unsigned rx_dc_base;
         unsigned sram_lim_qw;