net: bcm: genet: Increase max MTU supported - #7614
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The hardware has a RBUF_PKT_RDY_THLD register to the threshold value at which it raises an interrupt during receive. This is an 8bit register in units of 16bytes, and the value should be a multiple of the burst size of 256bytes. That corresponds to a register value of 0xf0, resulting in a max MTU of 3824. This also increases the receive buffer size to 10240 bytes in the hope that we can add handling for fragmented receives (multiple notifications). Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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The hardware has a RBUF_PKT_RDY_THLD register to the threshold value at which it raises an interrupt during receive. This is an 8bit register in units of 16bytes, and the value should be a multiple of the burst size of 256bytes. That corresponds to a register value of 0xf0, resulting in a max MTU of 3824.
This also increases the receive buffer size to 10240 bytes in the hope that we can add handling for fragmented receives (multiple notifications).
See #5561. Gets some improvement on jumbo frame support. Waiting for info from Broadcom for further improvements.