netdev - [PATCH net-next 2/6] bnxt_en: Do not allow ethtool -m on an untrusted VF

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Message-ID: <20241215205943.2341612-3-michael.chan@broadcom.com>
Date: Sun, 15 Dec 2024 12:59:39 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	andrew+netdev@...n.ch,
	pavan.chebbi@...adcom.com,
	andrew.gospodarek@...adcom.com,
	Kalesh AP <kalesh-anakkur.purayil@...adcom.com>
Subject: [PATCH net-next 2/6] bnxt_en: Do not allow ethtool -m on an untrusted VF

Block all ethtool module operations on an untrusted VF.  The firmware
won't allow it and will return error.

Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@...adcom.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c         | 4 ++++
 drivers/net/ethernet/broadcom/bnxt/bnxt.h         | 5 +++++
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 9 +++++++++
 3 files changed, 18 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 469352ac1f7e..631dbda725ab 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -8284,6 +8284,10 @@ static int bnxt_hwrm_func_qcfg(struct bnxt *bp)
 		struct bnxt_vf_info *vf = &bp->vf;
 
 		vf->vlan = le16_to_cpu(resp->vlan) & VLAN_VID_MASK;
+		if (flags & FUNC_QCFG_RESP_FLAGS_TRUSTED_VF)
+			vf->flags |= BNXT_VF_TRUST;
+		else
+			vf->flags &= ~BNXT_VF_TRUST;
 	} else {
 		bp->pf.registered_vfs = le16_to_cpu(resp->registered_vfs);
 	}
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 3e20d200da62..d5e81e008ab5 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -2270,6 +2270,11 @@ struct bnxt {
 
 #define BNXT_PF(bp)		(!((bp)->flags & BNXT_FLAG_VF))
 #define BNXT_VF(bp)		((bp)->flags & BNXT_FLAG_VF)
+#ifdef CONFIG_BNXT_SRIOV
+#define	BNXT_VF_IS_TRUSTED(bp)	((bp)->vf.flags & BNXT_VF_TRUST)
+#else
+#define	BNXT_VF_IS_TRUSTED(bp)	0
+#endif
 #define BNXT_NPAR(bp)		((bp)->port_partition_type)
 #define BNXT_MH(bp)		((bp)->flags & BNXT_FLAG_MULTI_HOST)
 #define BNXT_SINGLE_PF(bp)	(BNXT_PF(bp) && !BNXT_NPAR(bp) && !BNXT_MH(bp))
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index d87681d71106..8de488f7cb6b 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -4375,6 +4375,9 @@ static int bnxt_get_module_info(struct net_device *dev,
 	struct bnxt *bp = netdev_priv(dev);
 	int rc;
 
+	if (BNXT_VF(bp) && !BNXT_VF_IS_TRUSTED(bp))
+		return -EPERM;
+
 	/* No point in going further if phy status indicates
 	 * module is not inserted or if it is powered down or
 	 * if it is of type 10GBase-T
@@ -4426,6 +4429,9 @@ static int bnxt_get_module_eeprom(struct net_device *dev,
 	u16  start = eeprom->offset, length = eeprom->len;
 	int rc = 0;
 
+	if (BNXT_VF(bp) && !BNXT_VF_IS_TRUSTED(bp))
+		return -EPERM;
+
 	memset(data, 0, eeprom->len);
 
 	/* Read A0 portion of the EEPROM */
@@ -4480,6 +4486,9 @@ static int bnxt_get_module_eeprom_by_page(struct net_device *dev,
 	struct bnxt *bp = netdev_priv(dev);
 	int rc;
 
+	if (BNXT_VF(bp) && !BNXT_VF_IS_TRUSTED(bp))
+		return -EPERM;
+
 	rc = bnxt_get_module_status(bp, extack);
 	if (rc)
 		return rc;
-- 
2.30.1