Re: [RFT net] net: ipa: fix u32_replace_bits by u32p_xxx version

On 9/9/20 7:02 AM, Vadym Kochan wrote:

Hi Alex,

On Wed, Sep 09, 2020 at 06:53:17AM -0500, Alex Elder wrote:

quoted

On 9/8/20 9:32 AM, Vadym Kochan wrote:

quoted

Looks like u32p_replace_bits() should be used instead of
u32_replace_bits() which does not modifies the value but returns the
modified version.

Fixes: 2b9feef2b6c2 ("soc: qcom: ipa: filter and routing tables")
Signed-off-by: Vadym Kochan <redacted>

You are correct!  Thank you for finding this.

Your fix is good, and I have now tested it and verified it
works as desired.

FYI, this is currently used only for the SDM845 platform.  It turns
out the register values (route and filter hash config) that are read
and intended to be updated always have value 0, so (fortunately) your
change has no effect there.

I had such assumption that probably it works without the fix.

quoted

Nevertheless, you have fixed this bug and I appreciate it.

Reviewed-by: Alex Elder <redacted>

My understanding is that I need to re-submit this as an official patch
without RFT/RFC prefix and with your reviewed tag ?

I hope David will accept it with my review, but if not maybe
he can answer your question.  Let's give him a chance to do
that, and if he hasn't responded within a day or two then
go ahead and send an updated version 2.

					-Alex

Regards,
Vadym Kochan

quoted

quoted

---
Found it while grepping of u32_replace_bits() usage and
replaced it w/o testing.

 drivers/net/ipa/ipa_table.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c
index 2098ca2f2c90..b3790aa952a1 100644
--- a/drivers/net/ipa/ipa_table.c
+++ b/drivers/net/ipa/ipa_table.c

@@ -521,7 +521,7 @@ static void ipa_filter_tuple_zero(struct ipa_endpoint *endpoint)
 	val = ioread32(endpoint->ipa->reg_virt + offset);
 
 	/* Zero all filter-related fields, preserving the rest */
-	u32_replace_bits(val, 0, IPA_REG_ENDP_FILTER_HASH_MSK_ALL);
+	u32p_replace_bits(&val, 0, IPA_REG_ENDP_FILTER_HASH_MSK_ALL);
 
 	iowrite32(val, endpoint->ipa->reg_virt + offset);
 }

@@ -573,7 +573,7 @@ static void ipa_route_tuple_zero(struct ipa *ipa, u32 route_id)
 	val = ioread32(ipa->reg_virt + offset);
 
 	/* Zero all route-related fields, preserving the rest */
-	u32_replace_bits(val, 0, IPA_REG_ENDP_ROUTER_HASH_MSK_ALL);
+	u32p_replace_bits(&val, 0, IPA_REG_ENDP_ROUTER_HASH_MSK_ALL);
 
 	iowrite32(val, ipa->reg_virt + offset);
 }