[net 07/15] net/mlx5e: kTLS, Fix page refcnt leak in TX resync error flow

[Saeed Mahameed]

From: Tariq Toukan <tar...@mellanox.com>

All references for frag pages that are obtained in tx_sync_info_get()
should be released.
Release usually occurs in the corresponding CQE of the WQE.
In error flows, not all fragments have a WQE posted for them, hence
no matching CQE will be generated.
For these pages, release the reference in the error flow.

Fixes: d2ead1f360e8 ("net/mlx5e: Add kTLS TX HW offload support")
Signed-off-by: Tariq Toukan <tar...@mellanox.com>
Reviewed-by: Eran Ben Elisha <era...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c 
b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c
index 334808b1863b..5f1d18fb644e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c
@@ -329,7 +329,7 @@ mlx5e_ktls_tx_handle_ooo(struct 
mlx5e_ktls_offload_context_tx *priv_tx,
        struct tx_sync_info info = {};
        u16 contig_wqebbs_room, pi;
        u8 num_wqebbs;
-       int i;
+       int i = 0;
 
        if (!tx_sync_info_get(priv_tx, seq, &info)) {
                /* We might get here if a retransmission reaches the driver
@@ -364,7 +364,7 @@ mlx5e_ktls_tx_handle_ooo(struct 
mlx5e_ktls_offload_context_tx *priv_tx,
 
        tx_post_resync_params(sq, priv_tx, info.rcd_sn);
 
-       for (i = 0; i < info.nr_frags; i++)
+       for (; i < info.nr_frags; i++)
                if (tx_post_resync_dump(sq, &info.frags[i], priv_tx->tisn, !i))
                        goto err_out;
 
@@ -377,6 +377,9 @@ mlx5e_ktls_tx_handle_ooo(struct 
mlx5e_ktls_offload_context_tx *priv_tx,
        return skb;
 
 err_out:
+       for (; i < info.nr_frags; i++)
+               put_page(skb_frag_page(&info.frags[i]));
+
        dev_kfree_skb_any(skb);
        return NULL;
 }
-- 
2.21.0