Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 92a04168 authored by Ben Hutchings's avatar Ben Hutchings
Browse files

sfc: Tighten the check for RX merged completion events 



The addition of RX event merging support means we don't reliably
detect dropped RX events now.  Currently we will only detect them if
the previous event for the RX queue had the CONT bit set.

Only accept RX completion events as merged if the
GET_CAPABILITIES_OUT_RX_BATCHING bit is set in datapath_caps (which it
won't be for the low-latency datapath) and the CONT bit is not set on
the event.

Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
parent 74cd60a4

drivers/net/ethernet/sfc/ef10.c

+9 −4
Original line number Diff line number Diff line
@@ -1766,6 +1766,8 @@ static int efx_ef10_handle_rx_event(struct efx_channel *channel, 
		   ((1 << ESF_DZ_RX_DSC_PTR_LBITS_WIDTH) - 1));



	if (n_descs != rx_queue->scatter_n + 1) {

		struct efx_ef10_nic_data *nic_data = efx->nic_data;



		/* detect rx abort */

		if (unlikely(n_descs == rx_queue->scatter_n)) {

			WARN_ON(rx_bytes != 0);
@@ -1773,10 +1775,13 @@ static int efx_ef10_handle_rx_event(struct efx_channel *channel, 
			return 0;

		}



		if (unlikely(rx_queue->scatter_n != 0)) {

			/* Scattered packet completions cannot be

			 * merged, so something has gone wrong.

		/* Check that RX completion merging is valid, i.e.

		 * the current firmware supports it and this is a

		 * non-scattered packet.

		 */

		if (!(nic_data->datapath_caps &

		      (1 << MC_CMD_GET_CAPABILITIES_OUT_RX_BATCHING_LBN)) ||

		    rx_queue->scatter_n != 0 || rx_cont) {

			efx_ef10_handle_rx_bad_lbits(

				rx_queue, next_ptr_lbits,

				(rx_queue->removed_count +