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nfp: devlink port split support for 1x100G CXP NIC

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This commit makes it possible to use devlink to split the 100G CXP
Netronome into two 40G interfaces. Currently when you ask for 2
interfaces, the math in src/nfp_devlink.c:nfp_devlink_port_split
calculates that you want 5 lanes per port because for some reason
eth_port.port_lanes=10 (shouldn't this be 12 for CXP?). What we really
want when asking for 2 breakout interfaces is 4 lanes per port. This
commit makes that happen by calculating based on 8 lanes if 10 are
present.

Signed-off-by: Ryan C Goodfellow <rgoodfel@isi.edu>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Greg Weeks <greg.weeks@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ryan C Goodfellow 2018-10-12 11:09:01 -07:00 committed by David S. Miller
parent ca0f32d5d9
commit 5948185b97
1 changed files with 14 additions and 3 deletions
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17
drivers/net/ethernet/netronome/nfp/nfp_devlink.c
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@ -66,6 +66,7 @@ nfp_devlink_port_split(struct devlink *devlink, unsigned int port_index,
{
struct nfp_pf *pf = devlink_priv(devlink);
struct nfp_eth_table_port eth_port;
unsigned int lanes;
int ret;
if (count < 2)
@ -84,8 +85,12 @@ nfp_devlink_port_split(struct devlink *devlink, unsigned int port_index,
goto out;
}
ret = nfp_devlink_set_lanes(pf, eth_port.index,
eth_port.port_lanes / count);
/* Special case the 100G CXP -> 2x40G split */
lanes = eth_port.port_lanes / count;
if (eth_port.lanes == 10 && count == 2)
lanes = 8 / count;
ret = nfp_devlink_set_lanes(pf, eth_port.index, lanes);
out:
mutex_unlock(&pf->lock);
@ -98,6 +103,7 @@ nfp_devlink_port_unsplit(struct devlink *devlink, unsigned int port_index,
{
struct nfp_pf *pf = devlink_priv(devlink);
struct nfp_eth_table_port eth_port;
unsigned int lanes;
int ret;
mutex_lock(&pf->lock);
@ -113,7 +119,12 @@ nfp_devlink_port_unsplit(struct devlink *devlink, unsigned int port_index,
goto out;
}
ret = nfp_devlink_set_lanes(pf, eth_port.index, eth_port.port_lanes);
/* Special case the 100G CXP -> 2x40G unsplit */
lanes = eth_port.port_lanes;
if (eth_port.port_lanes == 8)
lanes = 10;
ret = nfp_devlink_set_lanes(pf, eth_port.index, lanes);
out:
mutex_unlock(&pf->lock);