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Subject[PATCH 4.4 119/190] net/mlx4: Fix the check in attaching steering rules
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Talat Batheesh <talatb@mellanox.com>


[ Upstream commit 6dc06c08bef1c746ff8da33dab677cfbacdcad32 ]

Our previous patch (cited below) introduced a regression
for RAW Eth QPs.

Fix it by checking if the QP number provided by user-space
exists, hence allowing steering rules to be added for valid
QPs only.

Fixes: 89c557687a32 ("net/mlx4_en: Avoid adding steering rules with invalid ring")
Reported-by: Or Gerlitz <gerlitz.or@gmail.com>
Signed-off-by: Talat Batheesh <talatb@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Acked-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/mellanox/mlx4/en_ethtool.c | 5 -----
drivers/net/ethernet/mellanox/mlx4/mcg.c | 15 +++++++++++----
drivers/net/ethernet/mellanox/mlx4/qp.c | 13 +++++++++++++
include/linux/mlx4/qp.h | 1 +
4 files changed, 25 insertions(+), 9 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
@@ -1513,11 +1513,6 @@ static int mlx4_en_flow_replace(struct n
qpn = priv->drop_qp.qpn;
else if (cmd->fs.ring_cookie & EN_ETHTOOL_QP_ATTACH) {
qpn = cmd->fs.ring_cookie & (EN_ETHTOOL_QP_ATTACH - 1);
- if (qpn < priv->rss_map.base_qpn ||
- qpn >= priv->rss_map.base_qpn + priv->rx_ring_num) {
- en_warn(priv, "rxnfc: QP (0x%x) doesn't exist\n", qpn);
- return -EINVAL;
- }
} else {
if (cmd->fs.ring_cookie >= priv->rx_ring_num) {
en_warn(priv, "rxnfc: RX ring (%llu) doesn't exist\n",
--- a/drivers/net/ethernet/mellanox/mlx4/mcg.c
+++ b/drivers/net/ethernet/mellanox/mlx4/mcg.c
@@ -35,6 +35,7 @@
#include <linux/etherdevice.h>

#include <linux/mlx4/cmd.h>
+#include <linux/mlx4/qp.h>
#include <linux/export.h>

#include "mlx4.h"
@@ -985,16 +986,21 @@ int mlx4_flow_attach(struct mlx4_dev *de
if (IS_ERR(mailbox))
return PTR_ERR(mailbox);

+ if (!mlx4_qp_lookup(dev, rule->qpn)) {
+ mlx4_err_rule(dev, "QP doesn't exist\n", rule);
+ ret = -EINVAL;
+ goto out;
+ }
+
trans_rule_ctrl_to_hw(rule, mailbox->buf);

size += sizeof(struct mlx4_net_trans_rule_hw_ctrl);

list_for_each_entry(cur, &rule->list, list) {
ret = parse_trans_rule(dev, cur, mailbox->buf + size);
- if (ret < 0) {
- mlx4_free_cmd_mailbox(dev, mailbox);
- return ret;
- }
+ if (ret < 0)
+ goto out;
+
size += ret;
}

@@ -1021,6 +1027,7 @@ int mlx4_flow_attach(struct mlx4_dev *de
}
}

+out:
mlx4_free_cmd_mailbox(dev, mailbox);

return ret;
--- a/drivers/net/ethernet/mellanox/mlx4/qp.c
+++ b/drivers/net/ethernet/mellanox/mlx4/qp.c
@@ -381,6 +381,19 @@ static void mlx4_qp_free_icm(struct mlx4
__mlx4_qp_free_icm(dev, qpn);
}

+struct mlx4_qp *mlx4_qp_lookup(struct mlx4_dev *dev, u32 qpn)
+{
+ struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
+ struct mlx4_qp *qp;
+
+ spin_lock(&qp_table->lock);
+
+ qp = __mlx4_qp_lookup(dev, qpn);
+
+ spin_unlock(&qp_table->lock);
+ return qp;
+}
+
int mlx4_qp_alloc(struct mlx4_dev *dev, int qpn, struct mlx4_qp *qp, gfp_t gfp)
{
struct mlx4_priv *priv = mlx4_priv(dev);
--- a/include/linux/mlx4/qp.h
+++ b/include/linux/mlx4/qp.h
@@ -465,6 +465,7 @@ struct mlx4_update_qp_params {
u16 rate_val;
};

+struct mlx4_qp *mlx4_qp_lookup(struct mlx4_dev *dev, u32 qpn);
int mlx4_update_qp(struct mlx4_dev *dev, u32 qpn,
enum mlx4_update_qp_attr attr,
struct mlx4_update_qp_params *params);

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