Re: [PATCH net-next] net/smc: add the max value of fallback reason count

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On 2024/8/2 19:17, Wenjia Zhang wrote:


On 02.08.24 04:38, D. Wythe wrote:


On 8/1/24 7:35 PM, Zhengchao Shao wrote:
The number of fallback reasons defined in the smc_clc.h file has reached
36. For historical reasons, some are no longer quoted, and there's 33
actually in use. So, add the max value of fallback reason count to 50.

Signed-off-by: Zhengchao Shao <shaozhengchao@xxxxxxxxxx>
---
  net/smc/smc_stats.h | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/smc/smc_stats.h b/net/smc/smc_stats.h
index 9d32058db2b5..ab5aafc6f44c 100644
--- a/net/smc/smc_stats.h
+++ b/net/smc/smc_stats.h
@@ -19,7 +19,7 @@
  #include "smc_clc.h"
-#define SMC_MAX_FBACK_RSN_CNT 30
+#define SMC_MAX_FBACK_RSN_CNT 50
It feels more like a fix ?

  enum {
      SMC_BUF_8K,


Hi Zhengchao,

IMO It should be 36 instead of 50 because of unnecessary smc_stats_fback element and  unnecessary scanning e.g. in smc_stat_inc_fback_rsn_cnt(). If there is any new reason code coming later, the one who are introducing the new reason code should update the the value correspondingly.

I wonder if it is really necessary to expand to 50, since generally
the reasons for fallback in a machine will be concentrated into a few,
normally less than 10, so there is almost no case of using up all 30
reason slots.

Thanks!

Btw, I also it is a bug fix other than feature.

Thanks,
Wenjia




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