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Date: Wed, 13 Apr 2022 16:49:56 +0300 From: Maxim Mikityanskiy <maximmi@...dia.com> To: Boris Pismenny <borisp@...dia.com>, John Fastabend <john.fastabend@...il.com>, Daniel Borkmann <daniel@...earbox.net>, "Jakub Kicinski" <kuba@...nel.org> CC: "David S. Miller" <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>, Tariq Toukan <tariqt@...dia.com>, Aviad Yehezkel <aviadye@...lanox.com>, "Ilya Lesokhin" <ilyal@...lanox.com>, <netdev@...r.kernel.org>, Maxim Mikityanskiy <maximmi@...dia.com> Subject: [PATCH net] tls: Skip tls_append_frag on zero copy size Calling tls_append_frag when max_open_record_len == record->len might add an empty fragment to the TLS record if the call happens to be on the page boundary. Normally tls_append_frag coalesces the zero-sized fragment to the previous one, but not if it's on page boundary. If a resync happens then, the mlx5 driver posts dump WQEs in tx_post_resync_dump, and the empty fragment may become a data segment with byte_count == 0, which will confuse the NIC and lead to a CQE error. This commit fixes the described issue by skipping tls_append_frag on zero size to avoid adding empty fragments. The fix is not in the driver, because an empty fragment is hardly the desired behavior. Fixes: e8f69799810c ("net/tls: Add generic NIC offload infrastructure") Signed-off-by: Maxim Mikityanskiy <maximmi@...dia.com> Reviewed-by: Tariq Toukan <tariqt@...dia.com> --- net/tls/tls_device.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c index 12f7b56771d9..af875ad4a822 100644 --- a/net/tls/tls_device.c +++ b/net/tls/tls_device.c @@ -483,11 +483,13 @@ static int tls_push_data(struct sock *sk, copy = min_t(size_t, size, (pfrag->size - pfrag->offset)); copy = min_t(size_t, copy, (max_open_record_len - record->len)); - rc = tls_device_copy_data(page_address(pfrag->page) + - pfrag->offset, copy, msg_iter); - if (rc) - goto handle_error; - tls_append_frag(record, pfrag, copy); + if (copy) { + rc = tls_device_copy_data(page_address(pfrag->page) + + pfrag->offset, copy, msg_iter); + if (rc) + goto handle_error; + tls_append_frag(record, pfrag, copy); + } size -= copy; if (!size) { -- 2.25.1
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