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Message-ID: <20250421222827.283737-3-kuba@kernel.org>
Date: Mon, 21 Apr 2025 15:28:07 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
edumazet@...gle.com,
pabeni@...hat.com,
andrew+netdev@...n.ch,
horms@...nel.org,
donald.hunter@...il.com,
sdf@...ichev.me,
almasrymina@...gle.com,
dw@...idwei.uk,
asml.silence@...il.com,
ap420073@...il.com,
jdamato@...tly.com,
dtatulea@...dia.com,
michael.chan@...adcom.com,
Jakub Kicinski <kuba@...nel.org>
Subject: [RFC net-next 02/22] net: ethtool: report max value for rx-buf-len
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>
---
Documentation/netlink/specs/ethtool.yaml | 4 ++++
Documentation/networking/ethtool-netlink.rst | 1 +
include/linux/ethtool.h | 2 ++
include/uapi/linux/ethtool_netlink_generated.h | 1 +
drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c | 3 ++-
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 655d8d10fe24..3c09bfc206e1 100644
--- a/Documentation/netlink/specs/ethtool.yaml
+++ b/Documentation/netlink/specs/ethtool.yaml
@@ -338,6 +338,9 @@ uapi-header: linux/ethtool_netlink_generated.h
-
name: hds-thresh-max
type: u32
+ -
+ name: rx-buf-len-max
+ type: u32
-
name: mm-stat
@@ -1781,6 +1784,7 @@ uapi-header: linux/ethtool_netlink_generated.h
- 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 eaa9c17a3cb1..b7a99dfdffa9 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -893,6 +893,7 @@ Gets ring sizes like ``ETHTOOL_GRINGPARAM`` ioctl request.
``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/include/linux/ethtool.h b/include/linux/ethtool.h
index 7edb5f5e7134..1f61f03f354e 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -72,6 +72,7 @@ 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
@@ -84,6 +85,7 @@ 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 fe24c3459ac0..5a6393c0975f 100644
--- a/include/uapi/linux/ethtool_netlink_generated.h
+++ b/include/uapi/linux/ethtool_netlink_generated.h
@@ -157,6 +157,7 @@ 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/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
index 010385b29988..2466fe04b642 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
@@ -376,6 +376,7 @@ 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;
}
@@ -398,7 +399,7 @@ 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/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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