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net: dsa: sja1105: offload the Credit-Based Shaper qdisc

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SJA1105, being AVB/TSN switches, provide hardware assist for the
Credit-Based Shaper as described in the IEEE 8021Q-2018 document.

First generation has 10 shapers, freely assignable to any of the 4
external ports and 8 traffic classes, and second generation has 16
shapers.

The Credit-Based Shaper tables are accessed through the dynamic
reconfiguration interface, so we have to restore them manually after a
switch reset. The tables are backed up by the static config only on
P/Q/R/S, and we don't want to add custom code only for that family,
since the procedure that is in place now works for both.

Tested with the following commands:

data_rate_kbps=67000
port_transmit_rate_kbps=1000000
idleslope=$data_rate_kbps
sendslope=$(($idleslope - $port_transmit_rate_kbps))
locredit=$((-0x80000000))
hicredit=$((0x7fffffff))
tc qdisc add dev swp2 root handle 1: mqprio hw 0 num_tc 8 \
        map 0 1 2 3 4 5 6 7 \
        queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7
tc qdisc replace dev swp2 parent 1:1 cbs \
        idleslope $idleslope \
        sendslope $sendslope \
        hicredit $hicredit \
        locredit $locredit \
        offload 1

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2020-05-28 03:27:58 +03:00 committed by David S. Miller
parent 7c741868ce
commit 4d7525085a
5 changed files with 199 additions and 0 deletions
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2
drivers/net/dsa/sja1105/sja1105.h
View File

@ -84,6 +84,7 @@ struct sja1105_info {
* the egress timestamps.
*/
int ptpegr_ts_bytes;
int num_cbs_shapers;
const struct sja1105_dynamic_table_ops *dyn_ops;
const struct sja1105_table_ops *static_ops;
const struct sja1105_regs *regs;
@ -218,6 +219,7 @@ struct sja1105_private {
struct mutex mgmt_lock;
bool expect_dsa_8021q;
enum sja1105_vlan_state vlan_state;
struct sja1105_cbs_entry *cbs;
struct sja1105_tagger_data tagger_data;
struct sja1105_ptp_data ptp_data;
struct sja1105_tas_data tas_data;

76
drivers/net/dsa/sja1105/sja1105_dynamic_config.c
View File

@ -136,6 +136,12 @@
#define SJA1105_SIZE_RETAGGING_DYN_CMD \
(SJA1105_SIZE_DYN_CMD + SJA1105_SIZE_RETAGGING_ENTRY)
#define SJA1105ET_SIZE_CBS_DYN_CMD \
(SJA1105_SIZE_DYN_CMD + SJA1105ET_SIZE_CBS_ENTRY)
#define SJA1105PQRS_SIZE_CBS_DYN_CMD \
(SJA1105_SIZE_DYN_CMD + SJA1105PQRS_SIZE_CBS_ENTRY)
#define SJA1105_MAX_DYN_CMD_SIZE \
SJA1105PQRS_SIZE_MAC_CONFIG_DYN_CMD
@ -542,6 +548,60 @@ sja1105_retagging_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
sja1105_packing(p, &cmd->index, 5, 0, size, op);
}
static void sja1105et_cbs_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
enum packing_op op)
{
u8 *p = buf + SJA1105ET_SIZE_CBS_ENTRY;
const int size = SJA1105_SIZE_DYN_CMD;
sja1105_packing(p, &cmd->valid, 31, 31, size, op);
sja1105_packing(p, &cmd->index, 19, 16, size, op);
}
static size_t sja1105et_cbs_entry_packing(void *buf, void *entry_ptr,
enum packing_op op)
{
const size_t size = SJA1105ET_SIZE_CBS_ENTRY;
struct sja1105_cbs_entry *entry = entry_ptr;
u8 *cmd = buf + size;
u32 *p = buf;
sja1105_packing(cmd, &entry->port, 5, 3, SJA1105_SIZE_DYN_CMD, op);
sja1105_packing(cmd, &entry->prio, 2, 0, SJA1105_SIZE_DYN_CMD, op);
sja1105_packing(p + 3, &entry->credit_lo, 31, 0, size, op);
sja1105_packing(p + 2, &entry->credit_hi, 31, 0, size, op);
sja1105_packing(p + 1, &entry->send_slope, 31, 0, size, op);
sja1105_packing(p + 0, &entry->idle_slope, 31, 0, size, op);
return size;
}
static void sja1105pqrs_cbs_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
enum packing_op op)
{
u8 *p = buf + SJA1105PQRS_SIZE_CBS_ENTRY;
const int size = SJA1105_SIZE_DYN_CMD;
sja1105_packing(p, &cmd->valid, 31, 31, size, op);
sja1105_packing(p, &cmd->rdwrset, 30, 30, size, op);
sja1105_packing(p, &cmd->errors, 29, 29, size, op);
sja1105_packing(p, &cmd->index, 3, 0, size, op);
}
static size_t sja1105pqrs_cbs_entry_packing(void *buf, void *entry_ptr,
enum packing_op op)
{
const size_t size = SJA1105PQRS_SIZE_CBS_ENTRY;
struct sja1105_cbs_entry *entry = entry_ptr;
sja1105_packing(buf, &entry->port, 159, 157, size, op);
sja1105_packing(buf, &entry->prio, 156, 154, size, op);
sja1105_packing(buf, &entry->credit_lo, 153, 122, size, op);
sja1105_packing(buf, &entry->credit_hi, 121, 90, size, op);
sja1105_packing(buf, &entry->send_slope, 89, 58, size, op);
sja1105_packing(buf, &entry->idle_slope, 57, 26, size, op);
return size;
}
#define OP_READ BIT(0)
#define OP_WRITE BIT(1)
#define OP_DEL BIT(2)
@ -631,6 +691,14 @@ struct sja1105_dynamic_table_ops sja1105et_dyn_ops[BLK_IDX_MAX_DYN] = {
.packed_size = SJA1105_SIZE_RETAGGING_DYN_CMD,
.addr = 0x31,
},
[BLK_IDX_CBS] = {
.entry_packing = sja1105et_cbs_entry_packing,
.cmd_packing = sja1105et_cbs_cmd_packing,
.max_entry_count = SJA1105ET_MAX_CBS_COUNT,
.access = OP_WRITE,
.packed_size = SJA1105ET_SIZE_CBS_DYN_CMD,
.addr = 0x2c,
},
[BLK_IDX_XMII_PARAMS] = {0},
};
@ -725,6 +793,14 @@ struct sja1105_dynamic_table_ops sja1105pqrs_dyn_ops[BLK_IDX_MAX_DYN] = {
.packed_size = SJA1105_SIZE_RETAGGING_DYN_CMD,
.addr = 0x38,
},
[BLK_IDX_CBS] = {
.entry_packing = sja1105pqrs_cbs_entry_packing,
.cmd_packing = sja1105pqrs_cbs_cmd_packing,
.max_entry_count = SJA1105PQRS_MAX_CBS_COUNT,
.access = OP_WRITE,
.packed_size = SJA1105PQRS_SIZE_CBS_DYN_CMD,
.addr = 0x32,
},
[BLK_IDX_XMII_PARAMS] = {0},
};

100
drivers/net/dsa/sja1105/sja1105_main.c
View File

@ -1640,6 +1640,92 @@ static void sja1105_bridge_leave(struct dsa_switch *ds, int port,
sja1105_bridge_member(ds, port, br, false);
}
#define BYTES_PER_KBIT (1000LL / 8)
static int sja1105_find_unused_cbs_shaper(struct sja1105_private *priv)
{
int i;
for (i = 0; i < priv->info->num_cbs_shapers; i++)
if (!priv->cbs[i].idle_slope && !priv->cbs[i].send_slope)
return i;
return -1;
}
static int sja1105_delete_cbs_shaper(struct sja1105_private *priv, int port,
int prio)
{
int i;
for (i = 0; i < priv->info->num_cbs_shapers; i++) {
struct sja1105_cbs_entry *cbs = &priv->cbs[i];
if (cbs->port == port && cbs->prio == prio) {
memset(cbs, 0, sizeof(*cbs));
return sja1105_dynamic_config_write(priv, BLK_IDX_CBS,
i, cbs, true);
}
}
return 0;
}
static int sja1105_setup_tc_cbs(struct dsa_switch *ds, int port,
struct tc_cbs_qopt_offload *offload)
{
struct sja1105_private *priv = ds->priv;
struct sja1105_cbs_entry *cbs;
int index;
if (!offload->enable)
return sja1105_delete_cbs_shaper(priv, port, offload->queue);
index = sja1105_find_unused_cbs_shaper(priv);
if (index < 0)
return -ENOSPC;
cbs = &priv->cbs[index];
cbs->port = port;
cbs->prio = offload->queue;
/* locredit and sendslope are negative by definition. In hardware,
* positive values must be provided, and the negative sign is implicit.
*/
cbs->credit_hi = offload->hicredit;
cbs->credit_lo = abs(offload->locredit);
/* User space is in kbits/sec, hardware in bytes/sec */
cbs->idle_slope = offload->idleslope * BYTES_PER_KBIT;
cbs->send_slope = abs(offload->sendslope * BYTES_PER_KBIT);
/* Convert the negative values from 64-bit 2's complement
* to 32-bit 2's complement (for the case of 0x80000000 whose
* negative is still negative).
*/
cbs->credit_lo &= GENMASK_ULL(31, 0);
cbs->send_slope &= GENMASK_ULL(31, 0);
return sja1105_dynamic_config_write(priv, BLK_IDX_CBS, index, cbs,
true);
}
static int sja1105_reload_cbs(struct sja1105_private *priv)
{
int rc = 0, i;
for (i = 0; i < priv->info->num_cbs_shapers; i++) {
struct sja1105_cbs_entry *cbs = &priv->cbs[i];
if (!cbs->idle_slope && !cbs->send_slope)
continue;
rc = sja1105_dynamic_config_write(priv, BLK_IDX_CBS, i, cbs,
true);
if (rc)
break;
}
return rc;
}
static const char * const sja1105_reset_reasons[] = {
[SJA1105_VLAN_FILTERING] = "VLAN filtering",
[SJA1105_RX_HWTSTAMPING] = "RX timestamping",
@ -1754,6 +1840,10 @@ int sja1105_static_config_reload(struct sja1105_private *priv,
sja1105_sgmii_pcs_force_speed(priv, speed);
}
}
rc = sja1105_reload_cbs(priv);
if (rc < 0)
goto out;
out:
mutex_unlock(&priv->mgmt_lock);
@ -3131,6 +3221,8 @@ static int sja1105_port_setup_tc(struct dsa_switch *ds, int port,
switch (type) {
case TC_SETUP_QDISC_TAPRIO:
return sja1105_setup_tc_taprio(ds, port, type_data);
case TC_SETUP_QDISC_CBS:
return sja1105_setup_tc_cbs(ds, port, type_data);
default:
return -EOPNOTSUPP;
}
@ -3408,6 +3500,14 @@ static int sja1105_probe(struct spi_device *spi)
if (rc)
return rc;
if (IS_ENABLED(CONFIG_NET_SCH_CBS)) {
priv->cbs = devm_kcalloc(dev, priv->info->num_cbs_shapers,
sizeof(struct sja1105_cbs_entry),
GFP_KERNEL);
if (!priv->cbs)
return -ENOMEM;
}
/* Connections between dsa_port and sja1105_port */
for (port = 0; port < SJA1105_NUM_PORTS; port++) {
struct sja1105_port *sp = &priv->ports[port];

6
drivers/net/dsa/sja1105/sja1105_spi.c
View File

@ -515,6 +515,7 @@ struct sja1105_info sja1105e_info = {
.qinq_tpid = ETH_P_8021Q,
.ptp_ts_bits = 24,
.ptpegr_ts_bytes = 4,
.num_cbs_shapers = SJA1105ET_MAX_CBS_COUNT,
.reset_cmd = sja1105et_reset_cmd,
.fdb_add_cmd = sja1105et_fdb_add,
.fdb_del_cmd = sja1105et_fdb_del,
@ -530,6 +531,7 @@ struct sja1105_info sja1105t_info = {
.qinq_tpid = ETH_P_8021Q,
.ptp_ts_bits = 24,
.ptpegr_ts_bytes = 4,
.num_cbs_shapers = SJA1105ET_MAX_CBS_COUNT,
.reset_cmd = sja1105et_reset_cmd,
.fdb_add_cmd = sja1105et_fdb_add,
.fdb_del_cmd = sja1105et_fdb_del,
@ -545,6 +547,7 @@ struct sja1105_info sja1105p_info = {
.qinq_tpid = ETH_P_8021AD,
.ptp_ts_bits = 32,
.ptpegr_ts_bytes = 8,
.num_cbs_shapers = SJA1105PQRS_MAX_CBS_COUNT,
.setup_rgmii_delay = sja1105pqrs_setup_rgmii_delay,
.reset_cmd = sja1105pqrs_reset_cmd,
.fdb_add_cmd = sja1105pqrs_fdb_add,
@ -561,6 +564,7 @@ struct sja1105_info sja1105q_info = {
.qinq_tpid = ETH_P_8021AD,
.ptp_ts_bits = 32,
.ptpegr_ts_bytes = 8,
.num_cbs_shapers = SJA1105PQRS_MAX_CBS_COUNT,
.setup_rgmii_delay = sja1105pqrs_setup_rgmii_delay,
.reset_cmd = sja1105pqrs_reset_cmd,
.fdb_add_cmd = sja1105pqrs_fdb_add,
@ -577,6 +581,7 @@ struct sja1105_info sja1105r_info = {
.qinq_tpid = ETH_P_8021AD,
.ptp_ts_bits = 32,
.ptpegr_ts_bytes = 8,
.num_cbs_shapers = SJA1105PQRS_MAX_CBS_COUNT,
.setup_rgmii_delay = sja1105pqrs_setup_rgmii_delay,
.reset_cmd = sja1105pqrs_reset_cmd,
.fdb_add_cmd = sja1105pqrs_fdb_add,
@ -594,6 +599,7 @@ struct sja1105_info sja1105s_info = {
.qinq_tpid = ETH_P_8021AD,
.ptp_ts_bits = 32,
.ptpegr_ts_bytes = 8,
.num_cbs_shapers = SJA1105PQRS_MAX_CBS_COUNT,
.setup_rgmii_delay = sja1105pqrs_setup_rgmii_delay,
.reset_cmd = sja1105pqrs_reset_cmd,
.fdb_add_cmd = sja1105pqrs_fdb_add,

15
drivers/net/dsa/sja1105/sja1105_static_config.h
View File

@ -30,11 +30,13 @@
#define SJA1105ET_SIZE_L2_LOOKUP_PARAMS_ENTRY 4
#define SJA1105ET_SIZE_GENERAL_PARAMS_ENTRY 40
#define SJA1105ET_SIZE_AVB_PARAMS_ENTRY 12
#define SJA1105ET_SIZE_CBS_ENTRY 16
#define SJA1105PQRS_SIZE_L2_LOOKUP_ENTRY 20
#define SJA1105PQRS_SIZE_MAC_CONFIG_ENTRY 32
#define SJA1105PQRS_SIZE_L2_LOOKUP_PARAMS_ENTRY 16
#define SJA1105PQRS_SIZE_GENERAL_PARAMS_ENTRY 44
#define SJA1105PQRS_SIZE_AVB_PARAMS_ENTRY 16
#define SJA1105PQRS_SIZE_CBS_ENTRY 20
/* UM10944.pdf Page 11, Table 2. Configuration Blocks */
enum {
@ -56,6 +58,7 @@ enum {
BLKID_AVB_PARAMS = 0x10,
BLKID_GENERAL_PARAMS = 0x11,
BLKID_RETAGGING = 0x12,
BLKID_CBS = 0x13,
BLKID_XMII_PARAMS = 0x4E,
};
@ -78,6 +81,7 @@ enum sja1105_blk_idx {
BLK_IDX_AVB_PARAMS,
BLK_IDX_GENERAL_PARAMS,
BLK_IDX_RETAGGING,
BLK_IDX_CBS,
BLK_IDX_XMII_PARAMS,
BLK_IDX_MAX,
/* Fake block indices that are only valid for dynamic access */
@ -105,6 +109,8 @@ enum sja1105_blk_idx {
#define SJA1105_MAX_RETAGGING_COUNT 32
#define SJA1105_MAX_XMII_PARAMS_COUNT 1
#define SJA1105_MAX_AVB_PARAMS_COUNT 1
#define SJA1105ET_MAX_CBS_COUNT 10
#define SJA1105PQRS_MAX_CBS_COUNT 16
#define SJA1105_MAX_FRAME_MEMORY 929
#define SJA1105_MAX_FRAME_MEMORY_RETAGGING 910
@ -289,6 +295,15 @@ struct sja1105_retagging_entry {
u64 destports;
};
struct sja1105_cbs_entry {
u64 port;
u64 prio;
u64 credit_hi;
u64 credit_lo;
u64 send_slope;
u64 idle_slope;
};
struct sja1105_xmii_params_entry {
u64 phy_mac[5];
u64 xmii_mode[5];