[PATCH net-next v2] bnxt_en: Allow ntuple filters for drops
From: Joe Damato
Date: Thu Jan 29 2026 - 19:23:47 EST
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
Signed-off-by: Joe Damato <joe@xxxxxxx>
---
v2:
- Extract the FLOW_MAC_EXT and FLOW_EXT check so it happens unconditionally.
- Eliminate the local variable ring, which was used in only one place and
call ethtool_get_flow_spec_ring instead.
v1: https://lore.kernel.org/netdev/20260128222718.1679581-1-joe@xxxxxxx/
drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 6b15fedbb16f..eebe78628cbb 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -1346,18 +1346,22 @@ 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) {
+ vf = ethtool_get_flow_spec_ring_vf(fs->ring_cookie);
+ if (vf)
+ return -EOPNOTSUPP;
+ }
+
if (flow_type == IP_USER_FLOW) {
if (!bnxt_verify_ntuple_ip4_flow(&fs->h_u.usr_ip4_spec,
&fs->m_u.usr_ip4_spec))
@@ -1481,7 +1485,7 @@ 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) {
base-commit: 239f09e258b906deced5c2a7c1ac8aed301b558b
--
2.47.3