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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Daniel Bristot de Oliveira , Pawel Chmielewski , Jacob Keller , Yury Norov Subject: [PATCH 1/4] net: mellanox: drop mlx5_cpumask_default_spread() Date: Sun, 24 Sep 2023 19:05:25 -0700 Message-Id: <20230925020528.777578-2-yury.norov@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230925020528.777578-1-yury.norov@gmail.com> References: <20230925020528.777578-1-yury.norov@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (howler.vger.email [0.0.0.0]); Sun, 24 Sep 2023 19:05:44 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777997143060491762 X-GMAIL-MSGID: 1777997143060491762 The function duplicates existing cpumask_local_spread(), and it's O(N), while cpumask_local_spread() implementation is based on bsearch, and thus is O(log n), so drop mlx5_cpumask_default_spread() and use generic cpumask_local_spread(). Signed-off-by: Yury Norov Signed-off-by: Yury Norov Reviewed-by: Jacob Keller --- drivers/net/ethernet/mellanox/mlx5/core/eq.c | 28 ++------------------ 1 file changed, 2 insertions(+), 26 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c index ea0405e0a43f..bd9f857cc52d 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c @@ -828,30 +828,6 @@ static void comp_irq_release_pci(struct mlx5_core_dev *dev, u16 vecidx) mlx5_irq_release_vector(irq); } -static int mlx5_cpumask_default_spread(int numa_node, int index) -{ - const struct cpumask *prev = cpu_none_mask; - const struct cpumask *mask; - int found_cpu = 0; - int i = 0; - int cpu; - - rcu_read_lock(); - for_each_numa_hop_mask(mask, numa_node) { - for_each_cpu_andnot(cpu, mask, prev) { - if (i++ == index) { - found_cpu = cpu; - goto spread_done; - } - } - prev = mask; - } - -spread_done: - rcu_read_unlock(); - return found_cpu; -} - static struct cpu_rmap *mlx5_eq_table_get_pci_rmap(struct mlx5_core_dev *dev) { #ifdef CONFIG_RFS_ACCEL @@ -873,7 +849,7 @@ static int comp_irq_request_pci(struct mlx5_core_dev *dev, u16 vecidx) int cpu; rmap = mlx5_eq_table_get_pci_rmap(dev); - cpu = mlx5_cpumask_default_spread(dev->priv.numa_node, vecidx); + cpu = cpumask_local_spread(vecidx, dev->priv.numa_node); irq = mlx5_irq_request_vector(dev, cpu, vecidx, &rmap); if (IS_ERR(irq)) return PTR_ERR(irq); @@ -1125,7 +1101,7 @@ int mlx5_comp_vector_get_cpu(struct mlx5_core_dev *dev, int vector) if (mask) cpu = cpumask_first(mask); else - cpu = mlx5_cpumask_default_spread(dev->priv.numa_node, vector); + cpu = cpumask_local_spread(vector, dev->priv.numa_node); return cpu; }