[v10] igc: Add support for Frame Preemption feature in IGC

[PATCH iwl-next v10 07/14] igc: optimize TX packet buffer utilization for TSN mode

Posted by Faizal Rahim 9 months ago

In preparation for upcoming frame preemption patches, optimize the TX
packet buffer size. The total packet buffer size (RX + TX) is 64KB, with
a maximum of 34KB for either RX or TX. Split the buffer evenly,
allocating 32KB to each.

For TX, assign 7KB to each of the four TX packet buffers (total 28KB)
and reserve 4KB for BMC.

References:
I225/I226 SW User Manual Section 4.7.9, Section 8.3.2

Co-developed-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: Faizal Rahim <faizal.abdul.rahim@linux.intel.com>
---
 drivers/net/ethernet/intel/igc/igc_defines.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_defines.h b/drivers/net/ethernet/intel/igc/igc_defines.h
index b180e1497cc5..db937931c646 100644
--- a/drivers/net/ethernet/intel/igc/igc_defines.h
+++ b/drivers/net/ethernet/intel/igc/igc_defines.h
@@ -419,8 +419,8 @@
 	IGC_TXPB0SIZE(20) | IGC_TXPB1SIZE(0) | IGC_TXPB2SIZE(0) | \
 	IGC_TXPB3SIZE(0) | IGC_OS2BMCPBSIZE(4))
 #define IGC_TXPBSIZE_TSN ( \
-	IGC_TXPB0SIZE(5) | IGC_TXPB1SIZE(5) | IGC_TXPB2SIZE(5) | \
-	IGC_TXPB3SIZE(5) | IGC_OS2BMCPBSIZE(4))
+	IGC_TXPB0SIZE(7) | IGC_TXPB1SIZE(7) | IGC_TXPB2SIZE(7) | \
+	IGC_TXPB3SIZE(7) | IGC_OS2BMCPBSIZE(4))
 
 #define IGC_DTXMXPKTSZ_TSN	0x19 /* 1600 bytes of max TX DMA packet size */
 #define IGC_DTXMXPKTSZ_DEFAULT	0x98 /* 9728-byte Jumbo frames */
-- 
2.34.1

Re: [Intel-wired-lan] [PATCH iwl-next v10 07/14] igc: optimize TX packet buffer utilization for TSN mode

Posted by Mor Bar-Gabay 8 months, 3 weeks ago

On 18/03/2025 5:07, Faizal Rahim wrote:
> In preparation for upcoming frame preemption patches, optimize the TX
> packet buffer size. The total packet buffer size (RX + TX) is 64KB, with
> a maximum of 34KB for either RX or TX. Split the buffer evenly,
> allocating 32KB to each.
> 
> For TX, assign 7KB to each of the four TX packet buffers (total 28KB)
> and reserve 4KB for BMC.
> 
> References:
> I225/I226 SW User Manual Section 4.7.9, Section 8.3.2
> 
> Co-developed-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
> Signed-off-by: Faizal Rahim <faizal.abdul.rahim@linux.intel.com>
> ---
>   drivers/net/ethernet/intel/igc/igc_defines.h | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
Tested-by: Mor Bar-Gabay <morx.bar.gabay@intel.com>