From: Tariq Toukan <tariqt@nvidia.com>
To: Andrew Lunn <andrew+netdev@lunn.ch>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, <netdev@vger.kernel.org>,
Paolo Abeni <pabeni@redhat.com>
Cc: Alex Vesker <valex@nvidia.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Gal Pressman <gal@nvidia.com>,
Kalesh AP <kalesh-anakkur.purayil@broadcom.com>,
Kees Cook <kees@kernel.org>, "Leon Romanovsky" <leon@kernel.org>,
Leon Romanovsky <leonro@nvidia.com>,
<linux-kernel@vger.kernel.org>, <linux-rdma@vger.kernel.org>,
Mark Bloch <mbloch@nvidia.com>,
Saeed Mahameed <saeedm@nvidia.com>,
Tariq Toukan <tariqt@nvidia.com>,
Yevgeny Kliteynik <kliteyn@nvidia.com>
Subject: [PATCH net RESEND] net/mlx5: Use unique names for software steering caches
Date: Fri, 31 Jul 2026 00:02:00 +0300 [thread overview]
Message-ID: <20260730210200.2590115-1-tariqt@nvidia.com> (raw)
From: Leon Romanovsky <leonro@nvidia.com>
Each software steering domain creates its own slab caches, but all
domains use the same names. When domains for two devices are alive at
once, the second kmem_cache_create() triggers the following splat:
WARNING: mm/slab_common.c:111 at __kmem_cache_create_args+0xca/0x480, CPU#18: devlink/331372
Modules linked in: act_mirred act_skbedit cls_matchall act_gact cls_flower sch_ingress
vhost_vdpa veth nfnetlink_cttimeout openvswitch macvtap macvlan vfio_ap kvm nf_nat_tftp
nf_conntrack_tftp nsh nf_conncount vfio_pci_core irqbypass scsi_debug vhost_net tap tun
vhost_vsock vmw_vsock_virtio_transport_common vsock vhost nft_masq nft_reject_ipv4 act_csum
cls_u32 sch_htb smc_diag smc ppp_deflate bsd_comp ppp_async crc_ccitt ppp_generic slhc loop
algif_hash af_alg nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4
nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
nf_tables mlx5_vdpa vdpa mlx5_ib dm_service_time ib_uverbs_support vringh ib_core vhost_iotlb
mlx5_core s390_trng eadm_sch vfio_ccw mdev vfio_iommu_type1 vfio sch_fq_codel drm i2c_core
dm_multipath drm_panel_orientation_quirks uvdevice diag288_wdt watchdog hmac_s390 prng aes_s390
zfcp scsi_transport_fc pkey_pckmo pkey_cca pkey_ep11 zcrypt paes_s390 phmac_s390 rng_core
scsi_dh_alua pkey scsi_dh_rdac scsi_dh_emc crypto_engine autofs4 ecdsa_generic ecc sha512 [last unloaded: openvswitch]
CPU: 18 UID: 0 PID: 331372 Comm: devlink Tainted: G W 7.2.0-20260712.rc2.git0.e3321fa3034d.300.fc44.s390x+debug #1 PREEMPT
Tainted: [W]=WARN
Hardware name: IBM 9175 ME1 701 (LPAR)
Krnl PSW : 0704c00180000000 0000038139a6771a (__kmem_cache_create_args+0xda/0x480)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3
Krnl GPRS: 0000000000000000 0000000000000000 000003813b7de578 00000380b9eb8974
00000276c417f690 00000380b9eb8974 0000030144623348 00000277234a1660
0000000000000020 00000380b9eb8974 00000277234a1600 000003813b686d30
0000000000000000 00000380b9e9a810 0000038139a6771a 0000030144623238
Krnl Code: 0000038139a6770a: c02000ebb737 larl %r2,000003813b7de578
0000038139a67710: b9040039 lgr %r3,%r9
*0000038139a67714: c0e5006e2eb2 brasl %r14,000003813a82d478
>0000038139a6771a: a7390020 lghi %r3,32
0000038139a6771e: b9040029 lgr %r2,%r9
0000038139a67722: c0e5006cf98f brasl %r14,000003813a806a40
0000038139a67728: ec26018e007c cgij %r2,0,6,0000038139a67a44
0000038139a6772e: 58d0f0a4 l %r13,164(%r15)
Call Trace:
[<0000038139a6771a>] __kmem_cache_create_args+0xda/0x480
([<0000038139a676a2>] __kmem_cache_create_args+0x62/0x480)
[<00000380b9da1c70>] dr_domain_init_mem_resources+0x80/0x240 [mlx5_core]
[<00000380b9da226e>] dr_domain_init_resources.constprop.0+0x7e/0x2c0 [mlx5_core]
[<00000380b9da28b2>] mlx5dr_domain_create+0x132/0x250 [mlx5_core]
[<00000380b9dc1e20>] mlx5_cmd_dr_create_ns+0x30/0x90 [mlx5_core]
[<00000380b9cd8dbe>] mlx5_flow_namespace_set_mode+0x6e/0x130 [mlx5_core]
[<00000380b9d846ec>] esw_create_offloads_fdb_tables+0xac/0x5a0 [mlx5_core]
[<00000380b9d865b6>] esw_offloads_steering_init+0x1c6/0x480 [mlx5_core]
[<00000380b9d86e8e>] esw_offloads_enable+0x13e/0x410 [mlx5_core]
[<00000380b9d7b04a>] mlx5_eswitch_enable_locked+0x36a/0x540 [mlx5_core]
[<00000380b9d84ff0>] esw_offloads_start+0x50/0x1d0 [mlx5_core]
[<00000380b9d8774a>] mlx5_devlink_eswitch_mode_set+0x35a/0x3f0 [mlx5_core]
[<000003813a791e68>] devlink_nl_eswitch_set_doit+0x88/0x120
[<000003813a5b93ea>] genl_family_rcv_msg_doit+0xea/0x150
[<000003813a5b95c2>] genl_family_rcv_msg+0x172/0x210
[<000003813a5b96c2>] genl_rcv_msg+0x62/0xc0
[<000003813a5b7cac>] netlink_rcv_skb+0x5c/0x120
[<000003813a5b8f0c>] genl_rcv+0x3c/0x50
[<000003813a5b74a4>] netlink_unicast+0x1f4/0x2b0
[<000003813a5b783c>] netlink_sendmsg+0x2dc/0x460
[<000003813a4c9764>] __sock_sendmsg+0x64/0xd0
[<000003813a4cc878>] __sys_sendto+0x108/0x160
[<000003813a4cdf50>] __do_sys_socketcall+0x350/0x460
[<000003813a8184d2>] __do_syscall+0x172/0x750
[<000003813a82d5d2>] system_call+0x72/0x90
Prefix each cache name with the device name to make it unique.
Fixes: fd785e5213f0 ("net/mlx5: DR, Allocate icm_chunks from their own slab allocator")
Fixes: fb628b71fb2a ("net/mlx5: DR, Allocate htbl from its own slab allocator")
Reported-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Closes: https://lore.kernel.org/all/a3cea501-4d1f-47d5-b6d0-fcda9a0aab16@linux.ibm.com/
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Tested-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Link: https://lore.kernel.org/r/20260715-kmem-dupliate-name-v1-1-85551c328155@nvidia.com
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
.../ethernet/mellanox/mlx5/core/steering/sws/dr_domain.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/sws/dr_domain.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/sws/dr_domain.c
index fedefb565a21..c9f20a9033eb 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/sws/dr_domain.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/sws/dr_domain.c
@@ -98,9 +98,12 @@ int mlx5dr_domain_get_recalc_cs_ft_addr(struct mlx5dr_domain *dmn,
static int dr_domain_init_mem_resources(struct mlx5dr_domain *dmn)
{
+ char name[80];
int ret;
- dmn->chunks_kmem_cache = kmem_cache_create("mlx5_dr_chunks",
+ snprintf(name, sizeof(name), "%s-mlx5_dr_chunks",
+ dev_name(dmn->mdev->device));
+ dmn->chunks_kmem_cache = kmem_cache_create(name,
sizeof(struct mlx5dr_icm_chunk), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!dmn->chunks_kmem_cache) {
@@ -108,7 +111,9 @@ static int dr_domain_init_mem_resources(struct mlx5dr_domain *dmn)
return -ENOMEM;
}
- dmn->htbls_kmem_cache = kmem_cache_create("mlx5_dr_htbls",
+ snprintf(name, sizeof(name), "%s-mlx5_dr_htbls",
+ dev_name(dmn->mdev->device));
+ dmn->htbls_kmem_cache = kmem_cache_create(name,
sizeof(struct mlx5dr_ste_htbl), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!dmn->htbls_kmem_cache) {
base-commit: 3bd438a58e910db5dc369aa25dfed1fc95f1b596
--
2.44.0
reply other threads:[~2026-07-30 21:03 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260730210200.2590115-1-tariqt@nvidia.com \
--to=tariqt@nvidia.com \
--cc=andrew+netdev@lunn.ch \
--cc=borntraeger@linux.ibm.com \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=gal@nvidia.com \
--cc=kalesh-anakkur.purayil@broadcom.com \
--cc=kees@kernel.org \
--cc=kliteyn@nvidia.com \
--cc=kuba@kernel.org \
--cc=leon@kernel.org \
--cc=leonro@nvidia.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rdma@vger.kernel.org \
--cc=mbloch@nvidia.com \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=saeedm@nvidia.com \
--cc=valex@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox