netdev - [PATCH net-next 5/6] i40e: Add info trace at loading XDP program

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Date:   Mon,  1 Feb 2021 18:24:19 -0800
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
        netdev@...r.kernel.org, sassmann@...hat.com,
        anthony.l.nguyen@...el.com, bjorn.topel@...el.com,
        maciej.fijalkowski@...el.com, magnus.karlsson@...el.com,
        Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
        George Kuruvinakunnel <george.kuruvinakunnel@...el.com>
Subject: [PATCH net-next 5/6] i40e: Add info trace at loading XDP program

From: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>

New trace indicates that the XDP program was loaded.
The trace has a note that in case of using XDP_REDIRECT,
number of queues on both interfaces shall be the same.
This is required for optimal performance of XDP_REDIRECT,
if interface used for TX has lower number of queues than
a RX interface, the packets may be dropped (depending on
RSS queue assignment).

Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Tested-by: George Kuruvinakunnel <george.kuruvinakunnel@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 521ea9df38d5..f35bd9164106 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -12489,11 +12489,14 @@ static int i40e_xdp_setup(struct i40e_vsi *vsi,
 	/* Kick start the NAPI context if there is an AF_XDP socket open
 	 * on that queue id. This so that receiving will start.
 	 */
-	if (need_reset && prog)
+	if (need_reset && prog) {
+		dev_info(&pf->pdev->dev,
+			 "Loading XDP program, please note: XDP_REDIRECT action requires the same number of queues on both interfaces\n");
 		for (i = 0; i < vsi->num_queue_pairs; i++)
 			if (vsi->xdp_rings[i]->xsk_pool)
 				(void)i40e_xsk_wakeup(vsi->netdev, i,
 						      XDP_WAKEUP_RX);
+	}
 
 	return 0;
 }
-- 
2.26.2