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| author | Sean Anderson <sean.anderson@seco.com> | 2022-09-20 18:12:28 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-09-23 11:55:35 +0100 |
| commit | 72bc36956f73ac54f19a7ac7302fb274069bec18 (patch) | |
| tree | bef8c711ee9452b311da418375fac2e506581c0a /include/linux/phylink.h | |
| parent | 1a4019f4922ea33547eb7f7a84616cd74045a4e2 (diff) | |
| download | lwn-72bc36956f73ac54f19a7ac7302fb274069bec18.tar.gz lwn-72bc36956f73ac54f19a7ac7302fb274069bec18.zip | |
net: phylink: Document MAC_(A)SYM_PAUSE
This documents the possible MLO_PAUSE_* settings which can result from
different combinations of MAC_(A)SYM_PAUSE. Special note is paid to
settings which can result from user configuration (MLO_PAUSE_AN). The
autonegotiation results are more-or-less a direct consequence of IEEE
802.3 Table 28B-2.
Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/phylink.h')
| -rw-r--r-- | include/linux/phylink.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/phylink.h b/include/linux/phylink.h index 6d06896fc20d..1f997e14bf80 100644 --- a/include/linux/phylink.h +++ b/include/linux/phylink.h @@ -21,6 +21,35 @@ enum { MLO_AN_FIXED, /* Fixed-link mode */ MLO_AN_INBAND, /* In-band protocol */ + /* MAC_SYM_PAUSE and MAC_ASYM_PAUSE are used when configuring our + * autonegotiation advertisement. They correspond to the PAUSE and + * ASM_DIR bits defined by 802.3, respectively. + * + * The following table lists the values of tx_pause and rx_pause which + * might be requested in mac_link_up. The exact values depend on either + * the results of autonegotation (if MLO_PAUSE_AN is set) or user + * configuration (if MLO_PAUSE_AN is not set). + * + * MAC_SYM_PAUSE MAC_ASYM_PAUSE MLO_PAUSE_AN tx_pause/rx_pause + * ============= ============== ============ ================== + * 0 0 0 0/0 + * 0 0 1 0/0 + * 0 1 0 0/0, 0/1, 1/0, 1/1 + * 0 1 1 0/0, 1/0 + * 1 0 0 0/0, 1/1 + * 1 0 1 0/0, 1/1 + * 1 1 0 0/0, 0/1, 1/0, 1/1 + * 1 1 1 0/0, 0/1, 1/1 + * + * If you set MAC_ASYM_PAUSE, the user may request any combination of + * tx_pause and rx_pause. You do not have to support these + * combinations. + * + * However, you should support combinations of tx_pause and rx_pause + * which might be the result of autonegotation. For example, don't set + * MAC_SYM_PAUSE unless your device can support tx_pause and rx_pause + * at the same time. + */ MAC_SYM_PAUSE = BIT(0), MAC_ASYM_PAUSE = BIT(1), MAC_10HD = BIT(2), |