sfc: Don't count RX checksum errors during loopback self-test

The loopback self-test checks that IP packets with incorrect checksums
are not altered when sent on a queue with checksum generation off.
These should not contribute to RX error statistics.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/net/sfc/falcon.c b/drivers/net/sfc/falcon.c
index e32be4c83d90..97cc037a10c5 100644
--- a/drivers/net/sfc/falcon.c
+++ b/drivers/net/sfc/falcon.c
@@ -784,15 +784,18 @@ static void falcon_handle_rx_not_ok(struct efx_rx_queue *rx_queue,
                            rx_ev_buf_owner_id_err | rx_ev_eth_crc_err |
                            rx_ev_frm_trunc | rx_ev_ip_hdr_chksum_err);
 
-        /* Count errors that are not in MAC stats. */
+        /* Count errors that are not in MAC stats.  Ignore expected
+         * checksum errors during self-test. */
         if (rx_ev_frm_trunc)
                 ++rx_queue->channel->n_rx_frm_trunc;
         else if (rx_ev_tobe_disc)
                 ++rx_queue->channel->n_rx_tobe_disc;
-        else if (rx_ev_ip_hdr_chksum_err)
-                ++rx_queue->channel->n_rx_ip_hdr_chksum_err;
-        else if (rx_ev_tcp_udp_chksum_err)
-                ++rx_queue->channel->n_rx_tcp_udp_chksum_err;
+        else if (!efx->loopback_selftest) {
+                if (rx_ev_ip_hdr_chksum_err)
+                        ++rx_queue->channel->n_rx_ip_hdr_chksum_err;
+                else if (rx_ev_tcp_udp_chksum_err)
+                        ++rx_queue->channel->n_rx_tcp_udp_chksum_err;
+        }
         if (rx_ev_ip_frag_err)
                 ++rx_queue->channel->n_rx_ip_frag_err;