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This patch adds support for management of the limited QOS features of the FM10000 interface. Specifically we can support up to 8 traffic classes, however the part only provides 1 Rx and 1 Tx FIFO in the host interface and as a result this can lead to head-of-line blocking on Rx. This can be avoided by setting PFC only for priorities that cannot afford to drop frames. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Acked-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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Alexander Duyck
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Jeff Kirsher
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Sep 23, 2014
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| /* Intel Ethernet Switch Host Interface Driver | ||
| * Copyright(c) 2013 - 2014 Intel Corporation. | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify it | ||
| * under the terms and conditions of the GNU General Public License, | ||
| * version 2, as published by the Free Software Foundation. | ||
| * | ||
| * This program is distributed in the hope it will be useful, but WITHOUT | ||
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | ||
| * more details. | ||
| * | ||
| * The full GNU General Public License is included in this distribution in | ||
| * the file called "COPYING". | ||
| * | ||
| * Contact Information: | ||
| * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> | ||
| * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 | ||
| */ | ||
|
|
||
| #include "fm10k.h" | ||
|
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| #ifdef CONFIG_DCB | ||
| /** | ||
| * fm10k_dcbnl_ieee_getets - get the ETS configuration for the device | ||
| * @dev: netdev interface for the device | ||
| * @ets: ETS structure to push configuration to | ||
| **/ | ||
| static int fm10k_dcbnl_ieee_getets(struct net_device *dev, struct ieee_ets *ets) | ||
| { | ||
| int i; | ||
|
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| /* we support 8 TCs in all modes */ | ||
| ets->ets_cap = IEEE_8021QAZ_MAX_TCS; | ||
| ets->cbs = 0; | ||
|
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| /* we only support strict priority and cannot do traffic shaping */ | ||
| memset(ets->tc_tx_bw, 0, sizeof(ets->tc_tx_bw)); | ||
| memset(ets->tc_rx_bw, 0, sizeof(ets->tc_rx_bw)); | ||
| memset(ets->tc_tsa, IEEE_8021QAZ_TSA_STRICT, sizeof(ets->tc_tsa)); | ||
|
|
||
| /* populate the prio map based on the netdev */ | ||
| for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) | ||
| ets->prio_tc[i] = netdev_get_prio_tc_map(dev, i); | ||
|
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| return 0; | ||
| } | ||
|
|
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| /** | ||
| * fm10k_dcbnl_ieee_setets - set the ETS configuration for the device | ||
| * @dev: netdev interface for the device | ||
| * @ets: ETS structure to pull configuration from | ||
| **/ | ||
| static int fm10k_dcbnl_ieee_setets(struct net_device *dev, struct ieee_ets *ets) | ||
| { | ||
| u8 num_tc = 0; | ||
| int i, err; | ||
|
|
||
| /* verify type and determine num_tcs needed */ | ||
| for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) { | ||
| if (ets->tc_tx_bw[i] || ets->tc_rx_bw[i]) | ||
| return -EINVAL; | ||
| if (ets->tc_tsa[i] != IEEE_8021QAZ_TSA_STRICT) | ||
| return -EINVAL; | ||
| if (ets->prio_tc[i] > num_tc) | ||
| num_tc = ets->prio_tc[i]; | ||
| } | ||
|
|
||
| /* if requested TC is greater than 0 then num_tcs is max + 1 */ | ||
| if (num_tc) | ||
| num_tc++; | ||
|
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| if (num_tc > IEEE_8021QAZ_MAX_TCS) | ||
| return -EINVAL; | ||
|
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| /* update TC hardware mapping if necessary */ | ||
| if (num_tc != netdev_get_num_tc(dev)) { | ||
| err = fm10k_setup_tc(dev, num_tc); | ||
| if (err) | ||
| return err; | ||
| } | ||
|
|
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| /* update priority mapping */ | ||
| for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) | ||
| netdev_set_prio_tc_map(dev, i, ets->prio_tc[i]); | ||
|
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||
| return 0; | ||
| } | ||
|
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| /** | ||
| * fm10k_dcbnl_ieee_getpfc - get the PFC configuration for the device | ||
| * @dev: netdev interface for the device | ||
| * @pfc: PFC structure to push configuration to | ||
| **/ | ||
| static int fm10k_dcbnl_ieee_getpfc(struct net_device *dev, struct ieee_pfc *pfc) | ||
| { | ||
| struct fm10k_intfc *interface = netdev_priv(dev); | ||
|
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| /* record flow control max count and state of TCs */ | ||
| pfc->pfc_cap = IEEE_8021QAZ_MAX_TCS; | ||
| pfc->pfc_en = interface->pfc_en; | ||
|
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| return 0; | ||
| } | ||
|
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||
| /** | ||
| * fm10k_dcbnl_ieee_setpfc - set the PFC configuration for the device | ||
| * @dev: netdev interface for the device | ||
| * @pfc: PFC structure to pull configuration from | ||
| **/ | ||
| static int fm10k_dcbnl_ieee_setpfc(struct net_device *dev, struct ieee_pfc *pfc) | ||
| { | ||
| struct fm10k_intfc *interface = netdev_priv(dev); | ||
|
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| /* record PFC configuration to interface */ | ||
| interface->pfc_en = pfc->pfc_en; | ||
|
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| /* if we are running update the drop_en state for all queues */ | ||
| if (netif_running(dev)) | ||
| fm10k_update_rx_drop_en(interface); | ||
|
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| return 0; | ||
| } | ||
|
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||
| /** | ||
| * fm10k_dcbnl_ieee_getdcbx - get the DCBX configuration for the device | ||
| * @dev: netdev interface for the device | ||
| * | ||
| * Returns that we support only IEEE DCB for this interface | ||
| **/ | ||
| static u8 fm10k_dcbnl_getdcbx(struct net_device *dev) | ||
| { | ||
| return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE; | ||
| } | ||
|
|
||
| /** | ||
| * fm10k_dcbnl_ieee_setdcbx - get the DCBX configuration for the device | ||
| * @dev: netdev interface for the device | ||
| * @mode: new mode for this device | ||
| * | ||
| * Returns error on attempt to enable anything but IEEE DCB for this interface | ||
| **/ | ||
| static u8 fm10k_dcbnl_setdcbx(struct net_device *dev, u8 mode) | ||
| { | ||
| return (mode != (DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE)) ? 1 : 0; | ||
| } | ||
|
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| static const struct dcbnl_rtnl_ops fm10k_dcbnl_ops = { | ||
| .ieee_getets = fm10k_dcbnl_ieee_getets, | ||
| .ieee_setets = fm10k_dcbnl_ieee_setets, | ||
| .ieee_getpfc = fm10k_dcbnl_ieee_getpfc, | ||
| .ieee_setpfc = fm10k_dcbnl_ieee_setpfc, | ||
|
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| .getdcbx = fm10k_dcbnl_getdcbx, | ||
| .setdcbx = fm10k_dcbnl_setdcbx, | ||
| }; | ||
|
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| #endif /* CONFIG_DCB */ | ||
| /** | ||
| * fm10k_dcbnl_set_ops - Configures dcbnl ops pointer for netdev | ||
| * @dev: netdev interface for the device | ||
| * | ||
| * Enables PF for DCB by assigning DCBNL ops pointer. | ||
| **/ | ||
| void fm10k_dcbnl_set_ops(struct net_device *dev) | ||
| { | ||
| #ifdef CONFIG_DCB | ||
| struct fm10k_intfc *interface = netdev_priv(dev); | ||
| struct fm10k_hw *hw = &interface->hw; | ||
|
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| if (hw->mac.type == fm10k_mac_pf) | ||
| dev->dcbnl_ops = &fm10k_dcbnl_ops; | ||
| #endif /* CONFIG_DCB */ | ||
| } |
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