[PATCH iwl-next v10 07/14] igc: optimize TX packet buffer utilization for TSN mode
Faizal Rahim
faizal.abdul.rahim at linux.intel.com
Mon Mar 17 20:07:35 PDT 2025
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 at intel.com>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes at intel.com>
Signed-off-by: Faizal Rahim <faizal.abdul.rahim at 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
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