netdev - [PATCH net-next v5 7/7] net: ethtool: add ring parameter filtering

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Message-Id: <20241113173222.372128-8-ap420073@gmail.com>
Date: Wed, 13 Nov 2024 17:32:21 +0000
From: Taehee Yoo <ap420073@...il.com>
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Subject: [PATCH net-next v5 7/7] net: ethtool: add ring parameter filtering

While the devmem is running, the tcp-data-split and
header-data-split-thresh configuration should not be changed.
If user tries to change tcp-data-split and threshold value while the
devmem is running, it fails and shows extack message.

Tested-by: Stanislav Fomichev <sdf@...ichev.me>
Reviewed-by: Mina Almasry <almasrymina@...gle.com>
Signed-off-by: Taehee Yoo <ap420073@...il.com>
---

v5:
 - Change extack message.
 - Add Review tag from Mina.

v4:
 - Check condition before __netif_get_rx_queue().
 - Separate condition check.
 - Add Test tag from Stanislav.

v3:
 - Patch added.

 net/ethtool/rings.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/net/ethtool/rings.c b/net/ethtool/rings.c
index ca836aad3fa9..3f3be806c6c8 100644
--- a/net/ethtool/rings.c
+++ b/net/ethtool/rings.c
@@ -258,6 +258,19 @@ ethnl_set_rings(struct ethnl_req_info *req_info, struct genl_info *info)
 		return -ERANGE;
 	}
 
+	if (dev_get_min_mp_channel_count(dev)) {
+		if (kernel_ringparam.tcp_data_split !=
+		    ETHTOOL_TCP_DATA_SPLIT_ENABLED) {
+			NL_SET_ERR_MSG(info->extack,
+				       "can't disable tcp-data-split while device has memory provider enabled");
+			return -EINVAL;
+		} else if (kernel_ringparam.hds_thresh) {
+			NL_SET_ERR_MSG(info->extack,
+				       "can't set non-zero hds_thresh while device is memory provider enabled");
+			return -EINVAL;
+		}
+	}
+
 	/* ensure new ring parameters are within limits */
 	if (ringparam.rx_pending > ringparam.rx_max_pending)
 		err_attr = tb[ETHTOOL_A_RINGS_RX];
-- 
2.34.1