Commit 0d58cdc9 authored by Faizal Rahim's avatar Faizal Rahim Committed by Tony Nguyen
Browse files

igc: optimize TX packet buffer utilization for TSN mode 



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: default avatarVinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: default avatarVinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: default avatarFaizal Rahim <faizal.abdul.rahim@linux.intel.com>
Tested-by: default avatarMor Bar-Gabay <morx.bar.gabay@intel.com>
Signed-off-by: default avatarTony Nguyen <anthony.l.nguyen@intel.com>
parent 425d8d9c

drivers/net/ethernet/intel/igc/igc_defines.h

+2 −2
Original line number Diff line number Diff line
@@ -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 */