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tls: Skip tls_append_frag on zero copy size

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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: e8f6979981 ("net/tls: Add generic NIC offload infrastructure")
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20220426154949.159055-1-maximmi@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Maxim Mikityanskiy 2022-04-26 18:49:49 +03:00 committed by Jakub Kicinski
parent 347cb5deae
commit a0df71948e
1 changed files with 7 additions and 5 deletions
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12
net/tls/tls_device.c
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@ -483,11 +483,13 @@ handle_error:
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) {