i.MX ProcessorsのトピックRe: Does Imx6Q FEC has hardware checksum function

Does Imx6Q FEC has hardware checksum function

antzhao — Wed, 18 Mar 2015 02:03:36 GMT

Hi All

there is

/* Controller has hardware checksum support */

#define FEC_QUIRK_HAS_CSUM (1 << 5)

in linux 3.10.17/53

and

.name = "imx6q-fec",

.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT |

FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM |

FEC_QUIRK_HAS_VLAN | FEC_QUIRK_ERR006358 |

FEC_QUIRK_BUG_WAITMODE,

that is the FEC can do hardware checksum,but it does not work!

which register control this ? and How can I set the register ?

thanks.

igorpadykov — Wed, 18 Mar 2015 04:43:07 GMT

Hi ant

yes i.MX6 ENET (FEC) can do hardware checksum, for example refer to

sect.23.5.9 Receive Control Register (ENET_RCR) IMX6DQRM

Best regards

igor

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antzhao — Thu, 19 Mar 2015 01:50:41 GMT

Thanks for your answer.

But are ENET_RACC and ENET_TACC about hardware checksum.

In Kernel,there ard some codes

/* set RX checksum */

val = readl(fep->hwp + FEC_RACC);

if (fep->csum_flags & FLAG_RX_CSUM_ENABLED)

val |= FEC_RACC_OPTIONS;

else

val &= ~FEC_RACC_OPTIONS;

writel(val, fep->hwp + FEC_RACC);

.driver_data = | FEC_QUIRK_HAS_CSUM

Rx will do checksum,But The kernel does not do checksum for Tx.

there are not any codes about TACC.

So if I want do hard checksum for Tx ,What should I do?

I set TACC[PROCHK] and TACC[IPCHK] to 1,But it does not work.

Thanks again!

igorpadykov — Thu, 19 Mar 2015 15:37:10 GMT