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nfp: devlink port split support for 1x100G CXP NIC
[ Upstream commit 5948185b97
]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
3d7d10b9af
commit
2951868e6d
1 changed files with 14 additions and 3 deletions
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@ -96,6 +96,7 @@ nfp_devlink_port_split(struct devlink *devlink, unsigned int port_index,
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{
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struct nfp_pf *pf = devlink_priv(devlink);
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struct nfp_eth_table_port eth_port;
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unsigned int lanes;
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int ret;
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if (count < 2)
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@ -114,8 +115,12 @@ nfp_devlink_port_split(struct devlink *devlink, unsigned int port_index,
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goto out;
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}
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ret = nfp_devlink_set_lanes(pf, eth_port.index,
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eth_port.port_lanes / count);
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/* Special case the 100G CXP -> 2x40G split */
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lanes = eth_port.port_lanes / count;
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if (eth_port.lanes == 10 && count == 2)
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lanes = 8 / count;
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ret = nfp_devlink_set_lanes(pf, eth_port.index, lanes);
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out:
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mutex_unlock(&pf->lock);
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@ -128,6 +133,7 @@ nfp_devlink_port_unsplit(struct devlink *devlink, unsigned int port_index,
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{
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struct nfp_pf *pf = devlink_priv(devlink);
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struct nfp_eth_table_port eth_port;
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unsigned int lanes;
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int ret;
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mutex_lock(&pf->lock);
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@ -143,7 +149,12 @@ nfp_devlink_port_unsplit(struct devlink *devlink, unsigned int port_index,
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goto out;
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}
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ret = nfp_devlink_set_lanes(pf, eth_port.index, eth_port.port_lanes);
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/* Special case the 100G CXP -> 2x40G unsplit */
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lanes = eth_port.port_lanes;
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if (eth_port.port_lanes == 8)
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lanes = 10;
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ret = nfp_devlink_set_lanes(pf, eth_port.index, lanes);
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out:
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mutex_unlock(&pf->lock);
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