[PATCH 6.18 284/752] bnxt_en: Allow ntuple filters for drops

Sasha Levin
2026-02-28T17:52:05Z

From: Joe Damato <joe@dama.to>

[ Upstream commit 61cef6454cfbb9fcdbe41401fb53895f86603081 ]

It appears that in commit 7efd79c0e689 ("bnxt_en: Add drop action
support for ntuple"), bnxt gained support for ntuple filters for packet
drops.

However, support for this does not seem to work in recent kernels or
against net-next:

% sudo ethtool -U eth0 flow-type udp4 src-ip 1.1.1.1 action -1
rmgr: Cannot insert RX class rule: Operation not supported
Cannot insert classification rule

The issue is that the existing code uses ethtool_get_flow_spec_ring_vf,
which will return a non-zero value if the ring_cookie is set to
RX_CLS_FLOW_DISC, which then causes bnxt_add_ntuple_cls_rule to return
-EOPNOTSUPP because it thinks the user is trying to set an ntuple filter
for a vf.

Fix this by first checking that the ring_cookie is not RX_CLS_FLOW_DISC.

After this patch, ntuple filters for drops can be added:

% sudo ethtool -U eth0 flow-type udp4 src-ip 1.1.1.1 action -1
Added rule with ID 0

% ethtool -n eth0
44 RX rings available
Total 1 rules

Filter: 0
Rule Type: UDP over IPv4
Src IP addr: 1.1.1.1 mask: 0.0.0.0
Dest IP addr: 0.0.0.0 mask: 255.255.255.255
TOS: 0x0 mask: 0xff
Src port: 0 mask: 0xffff
Dest port: 0 mask: 0xffff
Action: Drop

Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/20260131003042.2570434-1-joe@dama.to
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 41686a6f84b58..df4f0d15dd3d8 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -1340,16 +1340,17 @@ static int bnxt_add_ntuple_cls_rule(struct bnxt *bp,
struct bnxt_l2_filter *l2_fltr;
struct bnxt_flow_masks *fmasks;
struct flow_keys *fkeys;
- u32 idx, ring;
+ u32 idx;
int rc;
- u8 vf;

if (!bp->vnic_info)
return -EAGAIN;

- vf = ethtool_get_flow_spec_ring_vf(fs->ring_cookie);
- ring = ethtool_get_flow_spec_ring(fs->ring_cookie);
- if ((fs->flow_type & (FLOW_MAC_EXT | FLOW_EXT)) || vf)
+ if (fs->flow_type & (FLOW_MAC_EXT | FLOW_EXT))
+ return -EOPNOTSUPP;
+
+ if (fs->ring_cookie != RX_CLS_FLOW_DISC &&
+ ethtool_get_flow_spec_ring_vf(fs->ring_cookie))
return -EOPNOTSUPP;

if (flow_type == IP_USER_FLOW) {
@@ -1475,7 +1476,7 @@ static int bnxt_add_ntuple_cls_rule(struct bnxt *bp,
if (fs->ring_cookie == RX_CLS_FLOW_DISC)
new_fltr->base.flags |= BNXT_ACT_DROP;
else
- new_fltr->base.rxq = ring;
+ new_fltr->base.rxq = ethtool_get_flow_spec_ring(fs->ring_cookie);
__set_bit(BNXT_FLTR_VALID, &new_fltr->base.state);
rc = bnxt_insert_ntp_filter(bp, new_fltr, idx);
if (!rc) {
--
2.51.0