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1 From 3426e5e4339f124f00eef8815b56a80481364550 Mon Sep 17 00:00:00 2001
2 From: Po Liu <po.liu@nxp.com>
3 Date: Mon, 25 Nov 2019 05:56:56 +0000
4 Subject: [PATCH] enetc: add support Credit Based Shaper(CBS) for hardware
5 offload
6
7 The ENETC hardware support the Credit Based Shaper(CBS) which part
8 of the IEEE-802.1Qav. The CBS driver was loaded by the sch_cbs
9 interface when set in the QOS in the kernel.
10
11 Here is an example command to set 20Mbits bandwidth in 1Gbits port
12 for taffic class 7:
13
14 tc qdisc add dev eth0 root handle 1: mqprio \
15 num_tc 8 map 0 1 2 3 4 5 6 7 hw 1
16
17 tc qdisc replace dev eth0 parent 1:8 cbs \
18 locredit -1470 hicredit 30 \
19 sendslope -980000 idleslope 20000 offload 1
20
21 Signed-off-by: Po Liu <Po.Liu@nxp.com>
22 Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>
23 Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
24 Signed-off-by: David S. Miller <davem@davemloft.net>
25 ---
26 drivers/net/ethernet/freescale/enetc/Kconfig | 4 +-
27 drivers/net/ethernet/freescale/enetc/enetc.c | 2 +
28 drivers/net/ethernet/freescale/enetc/enetc.h | 2 +
29 drivers/net/ethernet/freescale/enetc/enetc_hw.h | 4 +
30 drivers/net/ethernet/freescale/enetc/enetc_qos.c | 128 +++++++++++++++++++++++
31 5 files changed, 138 insertions(+), 2 deletions(-)
32
33 --- a/drivers/net/ethernet/freescale/enetc/Kconfig
34 +++ b/drivers/net/ethernet/freescale/enetc/Kconfig
35 @@ -53,10 +53,10 @@ config FSL_ENETC_HW_TIMESTAMPING
36
37 config FSL_ENETC_QOS
38 bool "ENETC hardware Time-sensitive Network support"
39 - depends on (FSL_ENETC || FSL_ENETC_VF) && NET_SCH_TAPRIO
40 + depends on (FSL_ENETC || FSL_ENETC_VF) && (NET_SCH_TAPRIO || NET_SCH_CBS)
41 help
42 There are Time-Sensitive Network(TSN) capabilities(802.1Qbv/802.1Qci
43 /802.1Qbu etc.) supported by ENETC. These TSN capabilities can be set
44 enable/disable from user space via Qos commands(tc). In the kernel
45 side, it can be loaded by Qos driver. Currently, it is only support
46 - taprio(802.1Qbv).
47 + taprio(802.1Qbv) and Credit Based Shaper(802.1Qbu).
48 --- a/drivers/net/ethernet/freescale/enetc/enetc.c
49 +++ b/drivers/net/ethernet/freescale/enetc/enetc.c
50 @@ -1524,6 +1524,8 @@ int enetc_setup_tc(struct net_device *nd
51 return enetc_setup_tc_mqprio(ndev, type_data);
52 case TC_SETUP_QDISC_TAPRIO:
53 return enetc_setup_tc_taprio(ndev, type_data);
54 + case TC_SETUP_QDISC_CBS:
55 + return enetc_setup_tc_cbs(ndev, type_data);
56 default:
57 return -EOPNOTSUPP;
58 }
59 --- a/drivers/net/ethernet/freescale/enetc/enetc.h
60 +++ b/drivers/net/ethernet/freescale/enetc/enetc.h
61 @@ -255,7 +255,9 @@ int enetc_send_cmd(struct enetc_si *si,
62 #ifdef CONFIG_FSL_ENETC_QOS
63 int enetc_setup_tc_taprio(struct net_device *ndev, void *type_data);
64 void enetc_sched_speed_set(struct net_device *ndev);
65 +int enetc_setup_tc_cbs(struct net_device *ndev, void *type_data);
66 #else
67 #define enetc_setup_tc_taprio(ndev, type_data) -EOPNOTSUPP
68 #define enetc_sched_speed_set(ndev) (void)0
69 +#define enetc_setup_tc_cbs(ndev, type_data) -EOPNOTSUPP
70 #endif
71 --- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
72 +++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
73 @@ -185,6 +185,8 @@ enum enetc_bdr_type {TX, RX};
74 #define ENETC_PSICFGR0_SIVC(bmp) (((bmp) & 0xff) << 24) /* VLAN_TYPE */
75
76 #define ENETC_PTCCBSR0(n) (0x1110 + (n) * 8) /* n = 0 to 7*/
77 +#define ENETC_CBSE BIT(31)
78 +#define ENETC_CBS_BW_MASK GENMASK(6, 0)
79 #define ENETC_PTCCBSR1(n) (0x1114 + (n) * 8) /* n = 0 to 7*/
80 #define ENETC_RSSHASH_KEY_SIZE 40
81 #define ENETC_PRSSCAPR 0x1404
82 @@ -679,6 +681,8 @@ struct enetc_cbd {
83 u8 status_flags;
84 };
85
86 +#define ENETC_CLK 400000000ULL
87 +
88 /* port time gating control register */
89 #define ENETC_QBV_PTGCR_OFFSET 0x11a00
90 #define ENETC_QBV_TGE BIT(31)
91 --- a/drivers/net/ethernet/freescale/enetc/enetc_qos.c
92 +++ b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
93 @@ -4,6 +4,7 @@
94 #include "enetc.h"
95
96 #include <net/pkt_sched.h>
97 +#include <linux/math64.h>
98
99 static u16 enetc_get_max_gcl_len(struct enetc_hw *hw)
100 {
101 @@ -170,3 +171,130 @@ int enetc_setup_tc_taprio(struct net_dev
102
103 return err;
104 }
105 +
106 +static u32 enetc_get_cbs_enable(struct enetc_hw *hw, u8 tc)
107 +{
108 + return enetc_port_rd(hw, ENETC_PTCCBSR0(tc)) & ENETC_CBSE;
109 +}
110 +
111 +static u8 enetc_get_cbs_bw(struct enetc_hw *hw, u8 tc)
112 +{
113 + return enetc_port_rd(hw, ENETC_PTCCBSR0(tc)) & ENETC_CBS_BW_MASK;
114 +}
115 +
116 +int enetc_setup_tc_cbs(struct net_device *ndev, void *type_data)
117 +{
118 + struct enetc_ndev_priv *priv = netdev_priv(ndev);
119 + struct tc_cbs_qopt_offload *cbs = type_data;
120 + u32 port_transmit_rate = priv->speed;
121 + u8 tc_nums = netdev_get_num_tc(ndev);
122 + struct enetc_si *si = priv->si;
123 + u32 hi_credit_bit, hi_credit_reg;
124 + u32 max_interference_size;
125 + u32 port_frame_max_size;
126 + u32 tc_max_sized_frame;
127 + u8 tc = cbs->queue;
128 + u8 prio_top, prio_next;
129 + int bw_sum = 0;
130 + u8 bw;
131 +
132 + prio_top = netdev_get_prio_tc_map(ndev, tc_nums - 1);
133 + prio_next = netdev_get_prio_tc_map(ndev, tc_nums - 2);
134 +
135 + /* Support highest prio and second prio tc in cbs mode */
136 + if (tc != prio_top && tc != prio_next)
137 + return -EOPNOTSUPP;
138 +
139 + if (!cbs->enable) {
140 + /* Make sure the other TC that are numerically
141 + * lower than this TC have been disabled.
142 + */
143 + if (tc == prio_top &&
144 + enetc_get_cbs_enable(&si->hw, prio_next)) {
145 + dev_err(&ndev->dev,
146 + "Disable TC%d before disable TC%d\n",
147 + prio_next, tc);
148 + return -EINVAL;
149 + }
150 +
151 + enetc_port_wr(&si->hw, ENETC_PTCCBSR1(tc), 0);
152 + enetc_port_wr(&si->hw, ENETC_PTCCBSR0(tc), 0);
153 +
154 + return 0;
155 + }
156 +
157 + if (cbs->idleslope - cbs->sendslope != port_transmit_rate * 1000L ||
158 + cbs->idleslope < 0 || cbs->sendslope > 0)
159 + return -EOPNOTSUPP;
160 +
161 + port_frame_max_size = ndev->mtu + VLAN_ETH_HLEN + ETH_FCS_LEN;
162 +
163 + bw = cbs->idleslope / (port_transmit_rate * 10UL);
164 +
165 + /* Make sure the other TC that are numerically
166 + * higher than this TC have been enabled.
167 + */
168 + if (tc == prio_next) {
169 + if (!enetc_get_cbs_enable(&si->hw, prio_top)) {
170 + dev_err(&ndev->dev,
171 + "Enable TC%d first before enable TC%d\n",
172 + prio_top, prio_next);
173 + return -EINVAL;
174 + }
175 + bw_sum += enetc_get_cbs_bw(&si->hw, prio_top);
176 + }
177 +
178 + if (bw_sum + bw >= 100) {
179 + dev_err(&ndev->dev,
180 + "The sum of all CBS Bandwidth can't exceed 100\n");
181 + return -EINVAL;
182 + }
183 +
184 + tc_max_sized_frame = enetc_port_rd(&si->hw, ENETC_PTCMSDUR(tc));
185 +
186 + /* For top prio TC, the max_interfrence_size is maxSizedFrame.
187 + *
188 + * For next prio TC, the max_interfrence_size is calculated as below:
189 + *
190 + * max_interference_size = M0 + Ma + Ra * M0 / (R0 - Ra)
191 + *
192 + * - RA: idleSlope for AVB Class A
193 + * - R0: port transmit rate
194 + * - M0: maximum sized frame for the port
195 + * - MA: maximum sized frame for AVB Class A
196 + */
197 +
198 + if (tc == prio_top) {
199 + max_interference_size = port_frame_max_size * 8;
200 + } else {
201 + u32 m0, ma, r0, ra;
202 +
203 + m0 = port_frame_max_size * 8;
204 + ma = enetc_port_rd(&si->hw, ENETC_PTCMSDUR(prio_top)) * 8;
205 + ra = enetc_get_cbs_bw(&si->hw, prio_top) *
206 + port_transmit_rate * 10000ULL;
207 + r0 = port_transmit_rate * 1000000ULL;
208 + max_interference_size = m0 + ma +
209 + (u32)div_u64((u64)ra * m0, r0 - ra);
210 + }
211 +
212 + /* hiCredit bits calculate by:
213 + *
214 + * maxSizedFrame * (idleSlope/portTxRate)
215 + */
216 + hi_credit_bit = max_interference_size * bw / 100;
217 +
218 + /* hiCredit bits to hiCredit register need to calculated as:
219 + *
220 + * (enetClockFrequency / portTransmitRate) * 100
221 + */
222 + hi_credit_reg = (u32)div_u64((ENETC_CLK * 100ULL) * hi_credit_bit,
223 + port_transmit_rate * 1000000ULL);
224 +
225 + enetc_port_wr(&si->hw, ENETC_PTCCBSR1(tc), hi_credit_reg);
226 +
227 + /* Set bw register and enable this traffic class */
228 + enetc_port_wr(&si->hw, ENETC_PTCCBSR0(tc), bw | ENETC_CBSE);
229 +
230 + return 0;
231 +}
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