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From 0d9ed0f09b92f730ae3a755415c4e68e62c4cf99 Mon Sep 17 00:00:00 2001
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From: Yishai Hadas <yishaih@nvidia.com>
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Date: Wed, 9 Dec 2020 09:15:39 +0200
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Subject: [PATCH] mlx5: Consider single threaded mode for shared UAR
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[ Upstream commit 9d6cbd2858d237d1d56bada430eca032074204c8 ]
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In case application uses a single threaded mode even a UAR that is
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shared between QPs doesn't need to take a lock.
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Fixes: 7fdcd258bc5f ("mlx5: Move to fully dynamic UAR mode including QPs")
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Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
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Signed-off-by: Nicolas Morey-Chaisemartin <nmoreychaisemartin@suse.com>
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---
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providers/mlx5/verbs.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/providers/mlx5/verbs.c b/providers/mlx5/verbs.c
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index 7907218295f6..cc93dc4c366e 100644
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--- a/providers/mlx5/verbs.c
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+++ b/providers/mlx5/verbs.c
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@@ -326,7 +326,7 @@ static void mlx5_insert_dyn_uuars(struct mlx5_context *ctx,
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if (!bf_uar->dyn_alloc_uar)
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bf->bfreg_dyn_index = (ctx->curr_legacy_dyn_sys_uar_page - 1) * num_bfregs_per_page + j;
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bf->dyn_alloc_uar = bf_uar->dyn_alloc_uar;
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- bf->need_lock = bf_uar->qp_shared;
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+ bf->need_lock = bf_uar->qp_shared && !mlx5_single_threaded;
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mlx5_spinlock_init(&bf->lock, bf->need_lock);
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if (j != 0) {
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bf->uar = bf_uar->uar;
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--
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2.25.4
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