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Message-ID: <a4d973e1eca37f1ff62a6b1388db5f6817e34beb.1760364551.git.asml.silence@gmail.com>
Date: Mon, 13 Oct 2025 15:54:05 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: netdev@...r.kernel.org
Cc: Andrew Lunn <andrew@...n.ch>,
Jakub Kicinski <kuba@...nel.org>,
davem@...emloft.net,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
Simon Horman <horms@...nel.org>,
Donald Hunter <donald.hunter@...il.com>,
Michael Chan <michael.chan@...adcom.com>,
Pavan Chebbi <pavan.chebbi@...adcom.com>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
Stanislav Fomichev <sdf@...ichev.me>,
Joshua Washington <joshwash@...gle.com>,
Harshitha Ramamurthy <hramamurthy@...gle.com>,
Jian Shen <shenjian15@...wei.com>,
Salil Mehta <salil.mehta@...wei.com>,
Jijie Shao <shaojijie@...wei.com>,
Sunil Goutham <sgoutham@...vell.com>,
Geetha sowjanya <gakula@...vell.com>,
Subbaraya Sundeep <sbhatta@...vell.com>,
hariprasad <hkelam@...vell.com>,
Bharat Bhushan <bbhushan2@...vell.com>,
Saeed Mahameed <saeedm@...dia.com>,
Tariq Toukan <tariqt@...dia.com>,
Mark Bloch <mbloch@...dia.com>,
Leon Romanovsky <leon@...nel.org>,
Alexander Duyck <alexanderduyck@...com>,
kernel-team@...a.com,
Ilias Apalodimas <ilias.apalodimas@...aro.org>,
Joe Damato <joe@...a.to>,
David Wei <dw@...idwei.uk>,
Willem de Bruijn <willemb@...gle.com>,
Mina Almasry <almasrymina@...gle.com>,
Pavel Begunkov <asml.silence@...il.com>,
Breno Leitao <leitao@...ian.org>,
Dragos Tatulea <dtatulea@...dia.com>,
linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org,
linux-rdma@...r.kernel.org,
Jonathan Corbet <corbet@....net>
Subject: [PATCH net-next v4 03/24] net: ethtool: report max value for rx-buf-len
From: Jakub Kicinski <kuba@...nel.org>
Unlike most of our APIs the rx-buf-len param does not have an associated
max value. In theory user could set this value pretty high, but in
practice most NICs have limits due to the width of the length fields
in the descriptors.
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
Documentation/netlink/specs/ethtool.yaml | 4 ++++
Documentation/networking/ethtool-netlink.rst | 1 +
drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c | 3 ++-
include/linux/ethtool.h | 2 ++
include/uapi/linux/ethtool_netlink_generated.h | 1 +
net/ethtool/rings.c | 5 +++++
6 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/Documentation/netlink/specs/ethtool.yaml b/Documentation/netlink/specs/ethtool.yaml
index 6a0fb1974513..68e2b63ba970 100644
--- a/Documentation/netlink/specs/ethtool.yaml
+++ b/Documentation/netlink/specs/ethtool.yaml
@@ -452,6 +452,9 @@ attribute-sets:
-
name: hds-thresh-max
type: u32
+ -
+ name: rx-buf-len-max
+ type: u32
-
name: mm-stat
@@ -2078,6 +2081,7 @@ operations:
- rx-jumbo
- tx
- rx-buf-len
+ - rx-buf-len-max
- tcp-data-split
- cqe-size
- tx-push
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index 392a359a9cab..d96a6292f37b 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -902,6 +902,7 @@ Kernel response contents:
``ETHTOOL_A_RINGS_RX_JUMBO`` u32 size of RX jumbo ring
``ETHTOOL_A_RINGS_TX`` u32 size of TX ring
``ETHTOOL_A_RINGS_RX_BUF_LEN`` u32 size of buffers on the ring
+ ``ETHTOOL_A_RINGS_RX_BUF_LEN_MAX`` u32 max size of rx buffers
``ETHTOOL_A_RINGS_TCP_DATA_SPLIT`` u8 TCP header / data split
``ETHTOOL_A_RINGS_CQE_SIZE`` u32 Size of TX/RX CQE
``ETHTOOL_A_RINGS_TX_PUSH`` u8 flag of TX Push mode
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
index b90e23dc49de..19bcf52330d4 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
@@ -377,6 +377,7 @@ static void otx2_get_ringparam(struct net_device *netdev,
ring->tx_max_pending = Q_COUNT(Q_SIZE_MAX);
ring->tx_pending = qs->sqe_cnt ? qs->sqe_cnt : Q_COUNT(Q_SIZE_4K);
kernel_ring->rx_buf_len = pfvf->hw.rbuf_len;
+ kernel_ring->rx_buf_len_max = 32768;
kernel_ring->cqe_size = pfvf->hw.xqe_size;
}
@@ -399,7 +400,7 @@ static int otx2_set_ringparam(struct net_device *netdev,
/* Hardware supports max size of 32k for a receive buffer
* and 1536 is typical ethernet frame size.
*/
- if (rx_buf_len && (rx_buf_len < 1536 || rx_buf_len > 32768)) {
+ if (rx_buf_len && rx_buf_len < 1536) {
netdev_err(netdev,
"Receive buffer range is 1536 - 32768");
return -EINVAL;
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index c2d8b4ec62eb..26ef5ffdc435 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -77,6 +77,7 @@ enum {
/**
* struct kernel_ethtool_ringparam - RX/TX ring configuration
* @rx_buf_len: Current length of buffers on the rx ring.
+ * @rx_buf_len_max: Max length of buffers on the rx ring.
* @tcp_data_split: Scatter packet headers and data to separate buffers
* @tx_push: The flag of tx push mode
* @rx_push: The flag of rx push mode
@@ -89,6 +90,7 @@ enum {
*/
struct kernel_ethtool_ringparam {
u32 rx_buf_len;
+ u32 rx_buf_len_max;
u8 tcp_data_split;
u8 tx_push;
u8 rx_push;
diff --git a/include/uapi/linux/ethtool_netlink_generated.h b/include/uapi/linux/ethtool_netlink_generated.h
index 0e8ac0d974e2..ae59d17bd7f2 100644
--- a/include/uapi/linux/ethtool_netlink_generated.h
+++ b/include/uapi/linux/ethtool_netlink_generated.h
@@ -192,6 +192,7 @@ enum {
ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN_MAX,
ETHTOOL_A_RINGS_HDS_THRESH,
ETHTOOL_A_RINGS_HDS_THRESH_MAX,
+ ETHTOOL_A_RINGS_RX_BUF_LEN_MAX,
__ETHTOOL_A_RINGS_CNT,
ETHTOOL_A_RINGS_MAX = (__ETHTOOL_A_RINGS_CNT - 1)
diff --git a/net/ethtool/rings.c b/net/ethtool/rings.c
index aeedd5ec6b8c..5e872ceab5dd 100644
--- a/net/ethtool/rings.c
+++ b/net/ethtool/rings.c
@@ -105,6 +105,9 @@ static int rings_fill_reply(struct sk_buff *skb,
ringparam->tx_pending))) ||
(kr->rx_buf_len &&
(nla_put_u32(skb, ETHTOOL_A_RINGS_RX_BUF_LEN, kr->rx_buf_len))) ||
+ (kr->rx_buf_len_max &&
+ (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_BUF_LEN_MAX,
+ kr->rx_buf_len_max))) ||
(kr->tcp_data_split &&
(nla_put_u8(skb, ETHTOOL_A_RINGS_TCP_DATA_SPLIT,
kr->tcp_data_split))) ||
@@ -281,6 +284,8 @@ ethnl_set_rings(struct ethnl_req_info *req_info, struct genl_info *info)
err_attr = tb[ETHTOOL_A_RINGS_TX];
else if (kernel_ringparam.hds_thresh > kernel_ringparam.hds_thresh_max)
err_attr = tb[ETHTOOL_A_RINGS_HDS_THRESH];
+ else if (kernel_ringparam.rx_buf_len > kernel_ringparam.rx_buf_len_max)
+ err_attr = tb[ETHTOOL_A_RINGS_RX_BUF_LEN];
else
err_attr = NULL;
if (err_attr) {
--
2.49.0
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