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

Message ID 20250318030742.2567080-8-faizal.abdul.rahim@linux.intel.com
State Accepted
Delegated to: Anthony Nguyen
Headers show
Series igc: Add support for Frame Preemption feature in IGC | expand

Commit Message

Abdul Rahim, Faizal March 18, 2025, 3:07 a.m. UTC 
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(-)

Comments

Mor Bar-Gabay March 27, 2025, 12:58 p.m. UTC | #1 
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>
diff mbox series

Patch

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 */