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ice: Fix problems with DSCP QoS implementation

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The patch that implemented DSCP QoS implementation removed a
bandwidth check that was used to check for a specific condition
caused by some corner cases.  This check should not of been
removed.

The same patch also added a check for when the DCBx state could
be changed in relation to DSCP, but the check was erroneously
added nested in a check for CEE mode, which made the check useless.

Fix these problems by re-adding the bandwidth check and relocating
the DSCP mode check earlier in the function that changes DCBx state
in the driver.

Fixes: 2a87bd73e50d ("ice: Add DSCP support")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Dave Ertman <david.m.ertman@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Dave Ertman 2021-10-12 13:31:21 -07:00 committed by Tony Nguyen
parent 2657e16d8c
commit 6d39ea19b0
1 changed files with 12 additions and 6 deletions
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18
drivers/net/ethernet/intel/ice/ice_dcb_nl.c
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@ -97,6 +97,9 @@ static int ice_dcbnl_setets(struct net_device *netdev, struct ieee_ets *ets)
new_cfg->etscfg.maxtcs = pf->hw.func_caps.common_cap.maxtc;
if (!bwcfg)
new_cfg->etscfg.tcbwtable[0] = 100;
if (!bwrec)
new_cfg->etsrec.tcbwtable[0] = 100;
@ -167,15 +170,18 @@ static u8 ice_dcbnl_setdcbx(struct net_device *netdev, u8 mode)
if (mode == pf->dcbx_cap)
return ICE_DCB_NO_HW_CHG;
pf->dcbx_cap = mode;
qos_cfg = &pf->hw.port_info->qos_cfg;
if (mode & DCB_CAP_DCBX_VER_CEE) {
if (qos_cfg->local_dcbx_cfg.pfc_mode == ICE_QOS_MODE_DSCP)
return ICE_DCB_NO_HW_CHG;
/* DSCP configuration is not DCBx negotiated */
if (qos_cfg->local_dcbx_cfg.pfc_mode == ICE_QOS_MODE_DSCP)
return ICE_DCB_NO_HW_CHG;
pf->dcbx_cap = mode;
if (mode & DCB_CAP_DCBX_VER_CEE)
qos_cfg->local_dcbx_cfg.dcbx_mode = ICE_DCBX_MODE_CEE;
} else {
else
qos_cfg->local_dcbx_cfg.dcbx_mode = ICE_DCBX_MODE_IEEE;
}
dev_info(ice_pf_to_dev(pf), "DCBx mode = 0x%x\n", mode);
return ICE_DCB_HW_CHG_RST;