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| author |   Maxim Mikityanskiy <maximmi@mellanox.com> | 2019-03-27 13:39:21 +0200 |
|---|---|---|
| committer |   Saeed Mahameed <saeedm@mellanox.com> | 2019-04-23 12:09:21 -0700 |
| commit | b1b187e1029a374e83942e6c591ee5bf8b60f070 (patch) | |
| tree | 93c95eef33aeeb91957d179fb28f62cf935ed9b4 /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | net/mlx5e: Move parameter calculation functions to en/params.c (diff) | |
| download | wireguard-linux-b1b187e1029a374e83942e6c591ee5bf8b60f070.tar.xz wireguard-linux-b1b187e1029a374e83942e6c591ee5bf8b60f070.zip | |
net/mlx5e: Add an underflow warning comment
mlx5e_mpwqe_get_log_rq_size calculates the number of WQEs (N) based on
the requested number of frames in the RQ (F) and the number of packets
per WQE (P). It ensures that N is not less than the minimum number of
WQEs in an RQ (N_min). Arithmetically, it means that F / P >= N_min
should be true. This function deals with logarithms, so it should check
that log(F) - log(P) >= log(N_min). However, if F < P, this expression
will cause an unsigned underflow. Check log(F) >= log(P) + log(N_min)
instead.
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions