linux-kernel - Re: [EXTERNAL] Re: [PATCH V2 net-next] net: mana: Assigning IRQ affinity on HT cores

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Date:   Wed, 29 Nov 2023 14:17:39 -0800
From:   Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Souradeep Chakrabarti <schakrabarti@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        Long Li <longli@...rosoft.com>,
        "sharmaajay@...rosoft.com" <sharmaajay@...rosoft.com>,
        "leon@...nel.org" <leon@...nel.org>,
        "cai.huoqing@...ux.dev" <cai.huoqing@...ux.dev>,
        "ssengar@...ux.microsoft.com" <ssengar@...ux.microsoft.com>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Paul Rosswurm <paulros@...rosoft.com>
Subject: Re: [EXTERNAL] Re: [PATCH V2 net-next] net: mana: Assigning IRQ
 affinity on HT cores

On Mon, Nov 27, 2023 at 10:06:39AM -0800, Jakub Kicinski wrote:
> On Mon, 27 Nov 2023 09:36:38 +0000 Souradeep Chakrabarti wrote:
> > easier to keep things inside the mana driver code here
> 
> Easier for who? Upstream we care about consistency and maintainability
> across all drivers.
I am refactoring the code and putting some of the changes in topology.h
and in nodemask.h. I am sharing the proposed change here for those two
files. Please let me know if they are acceptable.

Added a new helper to iterate on numa nodes with cpu and start from a 
particular node, instead of first node. This helps when we want to
iterate from the local numa node.

diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index 8d07116caaf1..6e4528376164 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -392,6 +392,15 @@ static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp,
        for ((node) = 0; (node) < 1 && !nodes_empty(mask); (node)++)
 #endif /* MAX_NUMNODES */

+#if MAX_NUMNODES > 1
+#define for_each_node_next_mask(node_start, node_next, mask)           \
+       for ((node_next) = (node_start);                                \
+            (node_next) < MAX_NUMNODES;                                \
+            (node_next) = next_node((node_next), (mask)))
+#else
+#define for_each_node_next_mask(node_start, node_next, mask)   \
+       for_each_node_mask(node_next, mask)
+#endif
 /*
  * Bitmasks that are kept for all the nodes.
  */
@@ -440,6 +449,8 @@ static inline int num_node_state(enum node_states state)

 #define for_each_node_state(__node, __state) \
        for_each_node_mask((__node), node_states[__state])
+#define for_each_node_next_state(__node_start, __node_next, __state) \
+       for_each_node_next_mask((__node_start), (__node_next), node_states[__state])

 #define first_online_node      first_node(node_states[N_ONLINE])
 #define first_memory_node      first_node(node_states[N_MEMORY])
@@ -489,7 +500,8 @@ static inline int num_node_state(enum node_states state)

 #define for_each_node_state(node, __state) \
        for ( (node) = 0; (node) == 0; (node) = 1)
-
+#define for_each_node_next_state(node, next_node, _state) \
+       for_each_node_state(node, __state)
 #define first_online_node      0
 #define first_memory_node      0
 #define next_online_node(nid)  (MAX_NUMNODES)
@@ -535,6 +547,8 @@ static inline int node_random(const nodemask_t *maskp)

 #define for_each_node(node)       for_each_node_state(node, N_POSSIBLE)
 #define for_each_online_node(node) for_each_node_state(node, N_ONLINE)
+#define for_each_online_node_next(node, next_node)  \
+                                 for_each_node_next_state(node, next_node, N_ONLINE)

 /*
  * For nodemask scratch area.
diff --git a/include/linux/topology.h b/include/linux/topology.h
index 52f5850730b3..a06b16e5a955 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -43,6 +43,9 @@
        for_each_online_node(node)                      \
                if (nr_cpus_node(node))

+#define for_each_next_node_with_cpus(node, next_node)  \
+               for_each_online_node_next(node, next_node)      \
+               if (nr_cpus_node(next_node))
 int arch_update_cpu_topology(void);

 /* Conform to ACPI 2.0 SLIT distance definitions */