netdev - [PATCH bpf-next 08/10] ixgbe: xsk: diversify return values from xsk

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Date:   Tue,  5 Apr 2022 13:06:29 +0200
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        magnus.karlsson@...el.com, bjorn@...nel.org
Cc:     netdev@...r.kernel.org, brouer@...hat.com, maximmi@...dia.com,
        alexandr.lobakin@...el.com,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Subject: [PATCH bpf-next 08/10] ixgbe: xsk: diversify return values from xsk_wakeup call paths

Currently, when debugging AF_XDP workloads, one can correlate the -ENXIO
return code as the case that XSK is not in the bound state. Returning
same code from ndo_xsk_wakeup can be misleading and simply makes it
harder to follow what is going on.

Change ENXIOs in ixgbe's ndo_xsk_wakeup() implementations to EINVALs, so
that when probing it is clear that something is wrong on the driver
side, not in the xsk_{recv,send}msg.

There is a -ENETDOWN that can happen from both kernel/driver sides
though, but I don't have a correct replacement for this on one of the
sides, so let's keep it that way.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
index 475244a2c6e4..c8870da7af72 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
@@ -523,10 +523,10 @@ int ixgbe_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags)
 		return -ENETDOWN;
 
 	if (!READ_ONCE(adapter->xdp_prog))
-		return -ENXIO;
+		return -EINVAL;
 
 	if (qid >= adapter->num_xdp_queues)
-		return -ENXIO;
+		return -EINVAL;
 
 	ring = adapter->xdp_ring[qid];
 
@@ -534,7 +534,7 @@ int ixgbe_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags)
 		return -ENETDOWN;
 
 	if (!ring->xsk_pool)
-		return -ENXIO;
+		return -EINVAL;
 
 	if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) {
 		u64 eics = BIT_ULL(ring->q_vector->v_idx);
-- 
2.33.1