This is a note to let you know that I've just added the patch titled net/mlx4_core: Capping number of requested MSIXs to MAX_MSIX to the 4.2-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-mlx4_core-capping-number-of-requested-msixs-to-max_msix.patch and it can be found in the queue-4.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Wed Sep 30 05:25:07 CEST 2015 From: Carol L Soto <clsoto@xxxxxxxxxxxxxxxxxx> Date: Thu, 27 Aug 2015 14:43:25 -0500 Subject: net/mlx4_core: Capping number of requested MSIXs to MAX_MSIX From: Carol L Soto <clsoto@xxxxxxxxxxxxxxxxxx> [ Upstream commit 9293267a3e2a7a2555d8ddc8f9301525e5b03b1b ] We currently manage IRQs in pool_bm which is a bit field of MAX_MSIX bits. Thus, allocating more than MAX_MSIX interrupts can't be managed in pool_bm. Fixing this by capping number of requested MSIXs to MAX_MSIX. Signed-off-by: Matan Barak <matanb@xxxxxxxxxxxx> Signed-off-by: Carol L Soto <clsoto@xxxxxxxxxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/ethernet/mellanox/mlx4/main.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) --- a/drivers/net/ethernet/mellanox/mlx4/main.c +++ b/drivers/net/ethernet/mellanox/mlx4/main.c @@ -2654,9 +2654,14 @@ static void mlx4_enable_msi_x(struct mlx if (msi_x) { int nreq = dev->caps.num_ports * num_online_cpus() + 1; + bool shared_ports = false; nreq = min_t(int, dev->caps.num_eqs - dev->caps.reserved_eqs, nreq); + if (nreq > MAX_MSIX) { + nreq = MAX_MSIX; + shared_ports = true; + } entries = kcalloc(nreq, sizeof *entries, GFP_KERNEL); if (!entries) @@ -2679,6 +2684,9 @@ static void mlx4_enable_msi_x(struct mlx bitmap_zero(priv->eq_table.eq[MLX4_EQ_ASYNC].actv_ports.ports, dev->caps.num_ports); + if (MLX4_IS_LEGACY_EQ_MODE(dev->caps)) + shared_ports = true; + for (i = 0; i < dev->caps.num_comp_vectors + 1; i++) { if (i == MLX4_EQ_ASYNC) continue; @@ -2686,7 +2694,7 @@ static void mlx4_enable_msi_x(struct mlx priv->eq_table.eq[i].irq = entries[i + 1 - !!(i > MLX4_EQ_ASYNC)].vector; - if (MLX4_IS_LEGACY_EQ_MODE(dev->caps)) { + if (shared_ports) { bitmap_fill(priv->eq_table.eq[i].actv_ports.ports, dev->caps.num_ports); /* We don't set affinity hint when there Patches currently in stable-queue which might be from clsoto@xxxxxxxxxxxxxxxxxx are queue-4.2/net-mlx4_core-capping-number-of-requested-msixs-to-max_msix.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html