diff options
Diffstat (limited to 'drivers/net/dsa/bcm_sf2_cfp.c')
| -rw-r--r-- | drivers/net/dsa/bcm_sf2_cfp.c | 1307 |
1 files changed, 1307 insertions, 0 deletions
diff --git a/drivers/net/dsa/bcm_sf2_cfp.c b/drivers/net/dsa/bcm_sf2_cfp.c new file mode 100644 index 000000000..12156ab18 --- /dev/null +++ b/drivers/net/dsa/bcm_sf2_cfp.c @@ -0,0 +1,1307 @@ +/* + * Broadcom Starfighter 2 DSA switch CFP support + * + * Copyright (C) 2016, Broadcom + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/list.h> +#include <linux/ethtool.h> +#include <linux/if_ether.h> +#include <linux/in.h> +#include <linux/netdevice.h> +#include <net/dsa.h> +#include <linux/bitmap.h> + +#include "bcm_sf2.h" +#include "bcm_sf2_regs.h" + +struct cfp_udf_slice_layout { + u8 slices[UDFS_PER_SLICE]; + u32 mask_value; + u32 base_offset; +}; + +struct cfp_udf_layout { + struct cfp_udf_slice_layout udfs[UDF_NUM_SLICES]; +}; + +static const u8 zero_slice[UDFS_PER_SLICE] = { }; + +/* UDF slices layout for a TCPv4/UDPv4 specification */ +static const struct cfp_udf_layout udf_tcpip4_layout = { + .udfs = { + [1] = { + .slices = { + /* End of L2, byte offset 12, src IP[0:15] */ + CFG_UDF_EOL2 | 6, + /* End of L2, byte offset 14, src IP[16:31] */ + CFG_UDF_EOL2 | 7, + /* End of L2, byte offset 16, dst IP[0:15] */ + CFG_UDF_EOL2 | 8, + /* End of L2, byte offset 18, dst IP[16:31] */ + CFG_UDF_EOL2 | 9, + /* End of L3, byte offset 0, src port */ + CFG_UDF_EOL3 | 0, + /* End of L3, byte offset 2, dst port */ + CFG_UDF_EOL3 | 1, + 0, 0, 0 + }, + .mask_value = L3_FRAMING_MASK | IPPROTO_MASK | IP_FRAG, + .base_offset = CORE_UDF_0_A_0_8_PORT_0 + UDF_SLICE_OFFSET, + }, + }, +}; + +/* UDF slices layout for a TCPv6/UDPv6 specification */ +static const struct cfp_udf_layout udf_tcpip6_layout = { + .udfs = { + [0] = { + .slices = { + /* End of L2, byte offset 8, src IP[0:15] */ + CFG_UDF_EOL2 | 4, + /* End of L2, byte offset 10, src IP[16:31] */ + CFG_UDF_EOL2 | 5, + /* End of L2, byte offset 12, src IP[32:47] */ + CFG_UDF_EOL2 | 6, + /* End of L2, byte offset 14, src IP[48:63] */ + CFG_UDF_EOL2 | 7, + /* End of L2, byte offset 16, src IP[64:79] */ + CFG_UDF_EOL2 | 8, + /* End of L2, byte offset 18, src IP[80:95] */ + CFG_UDF_EOL2 | 9, + /* End of L2, byte offset 20, src IP[96:111] */ + CFG_UDF_EOL2 | 10, + /* End of L2, byte offset 22, src IP[112:127] */ + CFG_UDF_EOL2 | 11, + /* End of L3, byte offset 0, src port */ + CFG_UDF_EOL3 | 0, + }, + .mask_value = L3_FRAMING_MASK | IPPROTO_MASK | IP_FRAG, + .base_offset = CORE_UDF_0_B_0_8_PORT_0, + }, + [3] = { + .slices = { + /* End of L2, byte offset 24, dst IP[0:15] */ + CFG_UDF_EOL2 | 12, + /* End of L2, byte offset 26, dst IP[16:31] */ + CFG_UDF_EOL2 | 13, + /* End of L2, byte offset 28, dst IP[32:47] */ + CFG_UDF_EOL2 | 14, + /* End of L2, byte offset 30, dst IP[48:63] */ + CFG_UDF_EOL2 | 15, + /* End of L2, byte offset 32, dst IP[64:79] */ + CFG_UDF_EOL2 | 16, + /* End of L2, byte offset 34, dst IP[80:95] */ + CFG_UDF_EOL2 | 17, + /* End of L2, byte offset 36, dst IP[96:111] */ + CFG_UDF_EOL2 | 18, + /* End of L2, byte offset 38, dst IP[112:127] */ + CFG_UDF_EOL2 | 19, + /* End of L3, byte offset 2, dst port */ + CFG_UDF_EOL3 | 1, + }, + .mask_value = L3_FRAMING_MASK | IPPROTO_MASK | IP_FRAG, + .base_offset = CORE_UDF_0_D_0_11_PORT_0, + }, + }, +}; + +static inline unsigned int bcm_sf2_get_num_udf_slices(const u8 *layout) +{ + unsigned int i, count = 0; + + for (i = 0; i < UDFS_PER_SLICE; i++) { + if (layout[i] != 0) + count++; + } + + return count; +} + +static inline u32 udf_upper_bits(unsigned int num_udf) +{ + return GENMASK(num_udf - 1, 0) >> (UDFS_PER_SLICE - 1); +} + +static inline u32 udf_lower_bits(unsigned int num_udf) +{ + return (u8)GENMASK(num_udf - 1, 0); +} + +static unsigned int bcm_sf2_get_slice_number(const struct cfp_udf_layout *l, + unsigned int start) +{ + const struct cfp_udf_slice_layout *slice_layout; + unsigned int slice_idx; + + for (slice_idx = start; slice_idx < UDF_NUM_SLICES; slice_idx++) { + slice_layout = &l->udfs[slice_idx]; + if (memcmp(slice_layout->slices, zero_slice, + sizeof(zero_slice))) + break; + } + + return slice_idx; +} + +static void bcm_sf2_cfp_udf_set(struct bcm_sf2_priv *priv, + const struct cfp_udf_layout *layout, + unsigned int slice_num) +{ + u32 offset = layout->udfs[slice_num].base_offset; + unsigned int i; + + for (i = 0; i < UDFS_PER_SLICE; i++) + core_writel(priv, layout->udfs[slice_num].slices[i], + offset + i * 4); +} + +static int bcm_sf2_cfp_op(struct bcm_sf2_priv *priv, unsigned int op) +{ + unsigned int timeout = 1000; + u32 reg; + + reg = core_readl(priv, CORE_CFP_ACC); + reg &= ~(OP_SEL_MASK | RAM_SEL_MASK); + reg |= OP_STR_DONE | op; + core_writel(priv, reg, CORE_CFP_ACC); + + do { + reg = core_readl(priv, CORE_CFP_ACC); + if (!(reg & OP_STR_DONE)) + break; + + cpu_relax(); + } while (timeout--); + + if (!timeout) + return -ETIMEDOUT; + + return 0; +} + +static inline void bcm_sf2_cfp_rule_addr_set(struct bcm_sf2_priv *priv, + unsigned int addr) +{ + u32 reg; + + WARN_ON(addr >= priv->num_cfp_rules); + + reg = core_readl(priv, CORE_CFP_ACC); + reg &= ~(XCESS_ADDR_MASK << XCESS_ADDR_SHIFT); + reg |= addr << XCESS_ADDR_SHIFT; + core_writel(priv, reg, CORE_CFP_ACC); +} + +static inline unsigned int bcm_sf2_cfp_rule_size(struct bcm_sf2_priv *priv) +{ + /* Entry #0 is reserved */ + return priv->num_cfp_rules - 1; +} + +static int bcm_sf2_cfp_act_pol_set(struct bcm_sf2_priv *priv, + unsigned int rule_index, + unsigned int port_num, + unsigned int queue_num, + bool fwd_map_change) +{ + int ret; + u32 reg; + + /* Replace ARL derived destination with DST_MAP derived, define + * which port and queue this should be forwarded to. + */ + if (fwd_map_change) + reg = CHANGE_FWRD_MAP_IB_REP_ARL | + BIT(port_num + DST_MAP_IB_SHIFT) | + CHANGE_TC | queue_num << NEW_TC_SHIFT; + else + reg = 0; + + core_writel(priv, reg, CORE_ACT_POL_DATA0); + + /* Set classification ID that needs to be put in Broadcom tag */ + core_writel(priv, rule_index << CHAIN_ID_SHIFT, CORE_ACT_POL_DATA1); + + core_writel(priv, 0, CORE_ACT_POL_DATA2); + + /* Configure policer RAM now */ + ret = bcm_sf2_cfp_op(priv, OP_SEL_WRITE | ACT_POL_RAM); + if (ret) { + pr_err("Policer entry at %d failed\n", rule_index); + return ret; + } + + /* Disable the policer */ + core_writel(priv, POLICER_MODE_DISABLE, CORE_RATE_METER0); + + /* Now the rate meter */ + ret = bcm_sf2_cfp_op(priv, OP_SEL_WRITE | RATE_METER_RAM); + if (ret) { + pr_err("Meter entry at %d failed\n", rule_index); + return ret; + } + + return 0; +} + +static void bcm_sf2_cfp_slice_ipv4(struct bcm_sf2_priv *priv, + struct ethtool_tcpip4_spec *v4_spec, + unsigned int slice_num, + bool mask) +{ + u32 reg, offset; + + /* C-Tag [31:24] + * UDF_n_A8 [23:8] + * UDF_n_A7 [7:0] + */ + reg = 0; + if (mask) + offset = CORE_CFP_MASK_PORT(4); + else + offset = CORE_CFP_DATA_PORT(4); + core_writel(priv, reg, offset); + + /* UDF_n_A7 [31:24] + * UDF_n_A6 [23:8] + * UDF_n_A5 [7:0] + */ + reg = be16_to_cpu(v4_spec->pdst) >> 8; + if (mask) + offset = CORE_CFP_MASK_PORT(3); + else + offset = CORE_CFP_DATA_PORT(3); + core_writel(priv, reg, offset); + + /* UDF_n_A5 [31:24] + * UDF_n_A4 [23:8] + * UDF_n_A3 [7:0] + */ + reg = (be16_to_cpu(v4_spec->pdst) & 0xff) << 24 | + (u32)be16_to_cpu(v4_spec->psrc) << 8 | + (be32_to_cpu(v4_spec->ip4dst) & 0x0000ff00) >> 8; + if (mask) + offset = CORE_CFP_MASK_PORT(2); + else + offset = CORE_CFP_DATA_PORT(2); + core_writel(priv, reg, offset); + + /* UDF_n_A3 [31:24] + * UDF_n_A2 [23:8] + * UDF_n_A1 [7:0] + */ + reg = (u32)(be32_to_cpu(v4_spec->ip4dst) & 0xff) << 24 | + (u32)(be32_to_cpu(v4_spec->ip4dst) >> 16) << 8 | + (be32_to_cpu(v4_spec->ip4src) & 0x0000ff00) >> 8; + if (mask) + offset = CORE_CFP_MASK_PORT(1); + else + offset = CORE_CFP_DATA_PORT(1); + core_writel(priv, reg, offset); + + /* UDF_n_A1 [31:24] + * UDF_n_A0 [23:8] + * Reserved [7:4] + * Slice ID [3:2] + * Slice valid [1:0] + */ + reg = (u32)(be32_to_cpu(v4_spec->ip4src) & 0xff) << 24 | + (u32)(be32_to_cpu(v4_spec->ip4src) >> 16) << 8 | + SLICE_NUM(slice_num) | SLICE_VALID; + if (mask) + offset = CORE_CFP_MASK_PORT(0); + else + offset = CORE_CFP_DATA_PORT(0); + core_writel(priv, reg, offset); +} + +static int bcm_sf2_cfp_ipv4_rule_set(struct bcm_sf2_priv *priv, int port, + unsigned int port_num, + unsigned int queue_num, + struct ethtool_rx_flow_spec *fs) +{ + struct ethtool_tcpip4_spec *v4_spec, *v4_m_spec; + const struct cfp_udf_layout *layout; + unsigned int slice_num, rule_index; + u8 ip_proto, ip_frag; + u8 num_udf; + u32 reg; + int ret; + + switch (fs->flow_type & ~FLOW_EXT) { + case TCP_V4_FLOW: + ip_proto = IPPROTO_TCP; + v4_spec = &fs->h_u.tcp_ip4_spec; + v4_m_spec = &fs->m_u.tcp_ip4_spec; + break; + case UDP_V4_FLOW: + ip_proto = IPPROTO_UDP; + v4_spec = &fs->h_u.udp_ip4_spec; + v4_m_spec = &fs->m_u.udp_ip4_spec; + break; + default: + return -EINVAL; + } + + ip_frag = be32_to_cpu(fs->m_ext.data[0]); + + /* Locate the first rule available */ + if (fs->location == RX_CLS_LOC_ANY) + rule_index = find_first_zero_bit(priv->cfp.used, + priv->num_cfp_rules); + else + rule_index = fs->location; + + if (rule_index > bcm_sf2_cfp_rule_size(priv)) + return -ENOSPC; + + layout = &udf_tcpip4_layout; + /* We only use one UDF slice for now */ + slice_num = bcm_sf2_get_slice_number(layout, 0); + if (slice_num == UDF_NUM_SLICES) + return -EINVAL; + + num_udf = bcm_sf2_get_num_udf_slices(layout->udfs[slice_num].slices); + + /* Apply the UDF layout for this filter */ + bcm_sf2_cfp_udf_set(priv, layout, slice_num); + + /* Apply to all packets received through this port */ + core_writel(priv, BIT(port), CORE_CFP_DATA_PORT(7)); + + /* Source port map match */ + core_writel(priv, 0xff, CORE_CFP_MASK_PORT(7)); + + /* S-Tag status [31:30] + * C-Tag status [29:28] + * L2 framing [27:26] + * L3 framing [25:24] + * IP ToS [23:16] + * IP proto [15:08] + * IP Fragm [7] + * Non 1st frag [6] + * IP Authen [5] + * TTL range [4:3] + * PPPoE session [2] + * Reserved [1] + * UDF_Valid[8] [0] + */ + core_writel(priv, v4_spec->tos << IPTOS_SHIFT | + ip_proto << IPPROTO_SHIFT | ip_frag << IP_FRAG_SHIFT | + udf_upper_bits(num_udf), + CORE_CFP_DATA_PORT(6)); + + /* Mask with the specific layout for IPv4 packets */ + core_writel(priv, layout->udfs[slice_num].mask_value | + udf_upper_bits(num_udf), CORE_CFP_MASK_PORT(6)); + + /* UDF_Valid[7:0] [31:24] + * S-Tag [23:8] + * C-Tag [7:0] + */ + core_writel(priv, udf_lower_bits(num_udf) << 24, CORE_CFP_DATA_PORT(5)); + + /* Mask all but valid UDFs */ + core_writel(priv, udf_lower_bits(num_udf) << 24, CORE_CFP_MASK_PORT(5)); + + /* Program the match and the mask */ + bcm_sf2_cfp_slice_ipv4(priv, v4_spec, slice_num, false); + bcm_sf2_cfp_slice_ipv4(priv, v4_m_spec, SLICE_NUM_MASK, true); + + /* Insert into TCAM now */ + bcm_sf2_cfp_rule_addr_set(priv, rule_index); + + ret = bcm_sf2_cfp_op(priv, OP_SEL_WRITE | TCAM_SEL); + if (ret) { + pr_err("TCAM entry at addr %d failed\n", rule_index); + return ret; + } + + /* Insert into Action and policer RAMs now */ + ret = bcm_sf2_cfp_act_pol_set(priv, rule_index, port_num, + queue_num, true); + if (ret) + return ret; + + /* Turn on CFP for this rule now */ + reg = core_readl(priv, CORE_CFP_CTL_REG); + reg |= BIT(port); + core_writel(priv, reg, CORE_CFP_CTL_REG); + + /* Flag the rule as being used and return it */ + set_bit(rule_index, priv->cfp.used); + set_bit(rule_index, priv->cfp.unique); + fs->location = rule_index; + + return 0; +} + +static void bcm_sf2_cfp_slice_ipv6(struct bcm_sf2_priv *priv, + const __be32 *ip6_addr, const __be16 port, + unsigned int slice_num, + bool mask) +{ + u32 reg, tmp, val, offset; + + /* C-Tag [31:24] + * UDF_n_B8 [23:8] (port) + * UDF_n_B7 (upper) [7:0] (addr[15:8]) + */ + reg = be32_to_cpu(ip6_addr[3]); + val = (u32)be16_to_cpu(port) << 8 | ((reg >> 8) & 0xff); + if (mask) + offset = CORE_CFP_MASK_PORT(4); + else + offset = CORE_CFP_DATA_PORT(4); + core_writel(priv, val, offset); + + /* UDF_n_B7 (lower) [31:24] (addr[7:0]) + * UDF_n_B6 [23:8] (addr[31:16]) + * UDF_n_B5 (upper) [7:0] (addr[47:40]) + */ + tmp = be32_to_cpu(ip6_addr[2]); + val = (u32)(reg & 0xff) << 24 | (u32)(reg >> 16) << 8 | + ((tmp >> 8) & 0xff); + if (mask) + offset = CORE_CFP_MASK_PORT(3); + else + offset = CORE_CFP_DATA_PORT(3); + core_writel(priv, val, offset); + + /* UDF_n_B5 (lower) [31:24] (addr[39:32]) + * UDF_n_B4 [23:8] (addr[63:48]) + * UDF_n_B3 (upper) [7:0] (addr[79:72]) + */ + reg = be32_to_cpu(ip6_addr[1]); + val = (u32)(tmp & 0xff) << 24 | (u32)(tmp >> 16) << 8 | + ((reg >> 8) & 0xff); + if (mask) + offset = CORE_CFP_MASK_PORT(2); + else + offset = CORE_CFP_DATA_PORT(2); + core_writel(priv, val, offset); + + /* UDF_n_B3 (lower) [31:24] (addr[71:64]) + * UDF_n_B2 [23:8] (addr[95:80]) + * UDF_n_B1 (upper) [7:0] (addr[111:104]) + */ + tmp = be32_to_cpu(ip6_addr[0]); + val = (u32)(reg & 0xff) << 24 | (u32)(reg >> 16) << 8 | + ((tmp >> 8) & 0xff); + if (mask) + offset = CORE_CFP_MASK_PORT(1); + else + offset = CORE_CFP_DATA_PORT(1); + core_writel(priv, val, offset); + + /* UDF_n_B1 (lower) [31:24] (addr[103:96]) + * UDF_n_B0 [23:8] (addr[127:112]) + * Reserved [7:4] + * Slice ID [3:2] + * Slice valid [1:0] + */ + reg = (u32)(tmp & 0xff) << 24 | (u32)(tmp >> 16) << 8 | + SLICE_NUM(slice_num) | SLICE_VALID; + if (mask) + offset = CORE_CFP_MASK_PORT(0); + else + offset = CORE_CFP_DATA_PORT(0); + core_writel(priv, reg, offset); +} + +static int bcm_sf2_cfp_ipv6_rule_set(struct bcm_sf2_priv *priv, int port, + unsigned int port_num, + unsigned int queue_num, + struct ethtool_rx_flow_spec *fs) +{ + struct ethtool_tcpip6_spec *v6_spec, *v6_m_spec; + unsigned int slice_num, rule_index[2]; + const struct cfp_udf_layout *layout; + u8 ip_proto, ip_frag; + int ret = 0; + u8 num_udf; + u32 reg; + + switch (fs->flow_type & ~FLOW_EXT) { + case TCP_V6_FLOW: + ip_proto = IPPROTO_TCP; + v6_spec = &fs->h_u.tcp_ip6_spec; + v6_m_spec = &fs->m_u.tcp_ip6_spec; + break; + case UDP_V6_FLOW: + ip_proto = IPPROTO_UDP; + v6_spec = &fs->h_u.udp_ip6_spec; + v6_m_spec = &fs->m_u.udp_ip6_spec; + break; + default: + return -EINVAL; + } + + ip_frag = be32_to_cpu(fs->m_ext.data[0]); + + layout = &udf_tcpip6_layout; + slice_num = bcm_sf2_get_slice_number(layout, 0); + if (slice_num == UDF_NUM_SLICES) + return -EINVAL; + + num_udf = bcm_sf2_get_num_udf_slices(layout->udfs[slice_num].slices); + + /* Negotiate two indexes, one for the second half which we are chained + * from, which is what we will return to user-space, and a second one + * which is used to store its first half. That first half does not + * allow any choice of placement, so it just needs to find the next + * available bit. We return the second half as fs->location because + * that helps with the rule lookup later on since the second half is + * chained from its first half, we can easily identify IPv6 CFP rules + * by looking whether they carry a CHAIN_ID. + * + * We also want the second half to have a lower rule_index than its + * first half because the HW search is by incrementing addresses. + */ + if (fs->location == RX_CLS_LOC_ANY) + rule_index[1] = find_first_zero_bit(priv->cfp.used, + priv->num_cfp_rules); + else + rule_index[1] = fs->location; + if (rule_index[1] > bcm_sf2_cfp_rule_size(priv)) + return -ENOSPC; + + /* Flag it as used (cleared on error path) such that we can immediately + * obtain a second one to chain from. + */ + set_bit(rule_index[1], priv->cfp.used); + + rule_index[0] = find_first_zero_bit(priv->cfp.used, + priv->num_cfp_rules); + if (rule_index[0] > bcm_sf2_cfp_rule_size(priv)) { + ret = -ENOSPC; + goto out_err; + } + + /* Apply the UDF layout for this filter */ + bcm_sf2_cfp_udf_set(priv, layout, slice_num); + + /* Apply to all packets received through this port */ + core_writel(priv, BIT(port), CORE_CFP_DATA_PORT(7)); + + /* Source port map match */ + core_writel(priv, 0xff, CORE_CFP_MASK_PORT(7)); + + /* S-Tag status [31:30] + * C-Tag status [29:28] + * L2 framing [27:26] + * L3 framing [25:24] + * IP ToS [23:16] + * IP proto [15:08] + * IP Fragm [7] + * Non 1st frag [6] + * IP Authen [5] + * TTL range [4:3] + * PPPoE session [2] + * Reserved [1] + * UDF_Valid[8] [0] + */ + reg = 1 << L3_FRAMING_SHIFT | ip_proto << IPPROTO_SHIFT | + ip_frag << IP_FRAG_SHIFT | udf_upper_bits(num_udf); + core_writel(priv, reg, CORE_CFP_DATA_PORT(6)); + + /* Mask with the specific layout for IPv6 packets including + * UDF_Valid[8] + */ + reg = layout->udfs[slice_num].mask_value | udf_upper_bits(num_udf); + core_writel(priv, reg, CORE_CFP_MASK_PORT(6)); + + /* UDF_Valid[7:0] [31:24] + * S-Tag [23:8] + * C-Tag [7:0] + */ + core_writel(priv, udf_lower_bits(num_udf) << 24, CORE_CFP_DATA_PORT(5)); + + /* Mask all but valid UDFs */ + core_writel(priv, udf_lower_bits(num_udf) << 24, CORE_CFP_MASK_PORT(5)); + + /* Slice the IPv6 source address and port */ + bcm_sf2_cfp_slice_ipv6(priv, v6_spec->ip6src, v6_spec->psrc, + slice_num, false); + bcm_sf2_cfp_slice_ipv6(priv, v6_m_spec->ip6src, v6_m_spec->psrc, + SLICE_NUM_MASK, true); + + /* Insert into TCAM now because we need to insert a second rule */ + bcm_sf2_cfp_rule_addr_set(priv, rule_index[0]); + + ret = bcm_sf2_cfp_op(priv, OP_SEL_WRITE | TCAM_SEL); + if (ret) { + pr_err("TCAM entry at addr %d failed\n", rule_index[0]); + goto out_err; + } + + /* Insert into Action and policer RAMs now */ + ret = bcm_sf2_cfp_act_pol_set(priv, rule_index[0], port_num, + queue_num, false); + if (ret) + goto out_err; + + /* Now deal with the second slice to chain this rule */ + slice_num = bcm_sf2_get_slice_number(layout, slice_num + 1); + if (slice_num == UDF_NUM_SLICES) { + ret = -EINVAL; + goto out_err; + } + + num_udf = bcm_sf2_get_num_udf_slices(layout->udfs[slice_num].slices); + + /* Apply the UDF layout for this filter */ + bcm_sf2_cfp_udf_set(priv, layout, slice_num); + + /* Chained rule, source port match is coming from the rule we are + * chained from. + */ + core_writel(priv, 0, CORE_CFP_DATA_PORT(7)); + core_writel(priv, 0, CORE_CFP_MASK_PORT(7)); + + /* + * CHAIN ID [31:24] chain to previous slice + * Reserved [23:20] + * UDF_Valid[11:8] [19:16] + * UDF_Valid[7:0] [15:8] + * UDF_n_D11 [7:0] + */ + reg = rule_index[0] << 24 | udf_upper_bits(num_udf) << 16 | + udf_lower_bits(num_udf) << 8; + core_writel(priv, reg, CORE_CFP_DATA_PORT(6)); + + /* Mask all except chain ID, UDF Valid[8] and UDF Valid[7:0] */ + reg = XCESS_ADDR_MASK << 24 | udf_upper_bits(num_udf) << 16 | + udf_lower_bits(num_udf) << 8; + core_writel(priv, reg, CORE_CFP_MASK_PORT(6)); + + /* Don't care */ + core_writel(priv, 0, CORE_CFP_DATA_PORT(5)); + + /* Mask all */ + core_writel(priv, 0, CORE_CFP_MASK_PORT(5)); + + bcm_sf2_cfp_slice_ipv6(priv, v6_spec->ip6dst, v6_spec->pdst, slice_num, + false); + bcm_sf2_cfp_slice_ipv6(priv, v6_m_spec->ip6dst, v6_m_spec->pdst, + SLICE_NUM_MASK, true); + + /* Insert into TCAM now */ + bcm_sf2_cfp_rule_addr_set(priv, rule_index[1]); + + ret = bcm_sf2_cfp_op(priv, OP_SEL_WRITE | TCAM_SEL); + if (ret) { + pr_err("TCAM entry at addr %d failed\n", rule_index[1]); + goto out_err; + } + + /* Insert into Action and policer RAMs now, set chain ID to + * the one we are chained to + */ + ret = bcm_sf2_cfp_act_pol_set(priv, rule_index[1], port_num, + queue_num, true); + if (ret) + goto out_err; + + /* Turn on CFP for this rule now */ + reg = core_readl(priv, CORE_CFP_CTL_REG); + reg |= BIT(port); + core_writel(priv, reg, CORE_CFP_CTL_REG); + + /* Flag the second half rule as being used now, return it as the + * location, and flag it as unique while dumping rules + */ + set_bit(rule_index[0], priv->cfp.used); + set_bit(rule_index[1], priv->cfp.unique); + fs->location = rule_index[1]; + + return ret; + +out_err: + clear_bit(rule_index[1], priv->cfp.used); + return ret; +} + +static int bcm_sf2_cfp_rule_set(struct dsa_switch *ds, int port, + struct ethtool_rx_flow_spec *fs) +{ + struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds); + s8 cpu_port = ds->ports[port].cpu_dp->index; + __u64 ring_cookie = fs->ring_cookie; + unsigned int queue_num, port_num; + int ret = -EINVAL; + + /* Check for unsupported extensions */ + if ((fs->flow_type & FLOW_EXT) && (fs->m_ext.vlan_etype || + fs->m_ext.data[1])) + return -EINVAL; + + if (fs->location != RX_CLS_LOC_ANY && + fs->location > bcm_sf2_cfp_rule_size(priv)) + return -EINVAL; + + if (fs->location != RX_CLS_LOC_ANY && + test_bit(fs->location, priv->cfp.used)) + return -EBUSY; + + /* This rule is a Wake-on-LAN filter and we must specifically + * target the CPU port in order for it to be working. + */ + if (ring_cookie == RX_CLS_FLOW_WAKE) + ring_cookie = cpu_port * SF2_NUM_EGRESS_QUEUES; + + /* We do not support discarding packets, check that the + * destination port is enabled and that we are within the + * number of ports supported by the switch + */ + port_num = ring_cookie / SF2_NUM_EGRESS_QUEUES; + + if (ring_cookie == RX_CLS_FLOW_DISC || + !(dsa_is_user_port(ds, port_num) || + dsa_is_cpu_port(ds, port_num)) || + port_num >= priv->hw_params.num_ports) + return -EINVAL; + /* + * We have a small oddity where Port 6 just does not have a + * valid bit here (so we substract by one). + */ + queue_num = ring_cookie % SF2_NUM_EGRESS_QUEUES; + if (port_num >= 7) + port_num -= 1; + + switch (fs->flow_type & ~FLOW_EXT) { + case TCP_V4_FLOW: + case UDP_V4_FLOW: + ret = bcm_sf2_cfp_ipv4_rule_set(priv, port, port_num, + queue_num, fs); + break; + case TCP_V6_FLOW: + case UDP_V6_FLOW: + ret = bcm_sf2_cfp_ipv6_rule_set(priv, port, port_num, + queue_num, fs); + break; + default: + break; + } + + return ret; +} + +static int bcm_sf2_cfp_rule_del_one(struct bcm_sf2_priv *priv, int port, + u32 loc, u32 *next_loc) +{ + int ret; + u32 reg; + + /* Indicate which rule we want to read */ + bcm_sf2_cfp_rule_addr_set(priv, loc); + + ret = bcm_sf2_cfp_op(priv, OP_SEL_READ | TCAM_SEL); + if (ret) + return ret; + + /* Check if this is possibly an IPv6 rule that would + * indicate we need to delete its companion rule + * as well + */ + reg = core_readl(priv, CORE_CFP_DATA_PORT(6)); + if (next_loc) + *next_loc = (reg >> 24) & CHAIN_ID_MASK; + + /* Clear its valid bits */ + reg = core_readl(priv, CORE_CFP_DATA_PORT(0)); + reg &= ~SLICE_VALID; + core_writel(priv, reg, CORE_CFP_DATA_PORT(0)); + + /* Write back this entry into the TCAM now */ + ret = bcm_sf2_cfp_op(priv, OP_SEL_WRITE | TCAM_SEL); + if (ret) + return ret; + + clear_bit(loc, priv->cfp.used); + clear_bit(loc, priv->cfp.unique); + + return 0; +} + +static int bcm_sf2_cfp_rule_del(struct bcm_sf2_priv *priv, int port, + u32 loc) +{ + u32 next_loc = 0; + int ret; + + if (loc > bcm_sf2_cfp_rule_size(priv)) + return -EINVAL; + + /* Refuse deleting unused rules, and those that are not unique since + * that could leave IPv6 rules with one of the chained rule in the + * table. + */ + if (!test_bit(loc, priv->cfp.unique) || loc == 0) + return -EINVAL; + + ret = bcm_sf2_cfp_rule_del_one(priv, port, loc, &next_loc); + if (ret) + return ret; + + /* If this was an IPv6 rule, delete is companion rule too */ + if (next_loc) + ret = bcm_sf2_cfp_rule_del_one(priv, port, next_loc, NULL); + + return ret; +} + +static void bcm_sf2_invert_masks(struct ethtool_rx_flow_spec *flow) +{ + unsigned int i; + + for (i = 0; i < sizeof(flow->m_u); i++) + flow->m_u.hdata[i] ^= 0xff; + + flow->m_ext.vlan_etype ^= cpu_to_be16(~0); + flow->m_ext.vlan_tci ^= cpu_to_be16(~0); + flow->m_ext.data[0] ^= cpu_to_be32(~0); + flow->m_ext.data[1] ^= cpu_to_be32(~0); +} + +static int bcm_sf2_cfp_unslice_ipv4(struct bcm_sf2_priv *priv, + struct ethtool_tcpip4_spec *v4_spec, + bool mask) +{ + u32 reg, offset, ipv4; + u16 src_dst_port; + + if (mask) + offset = CORE_CFP_MASK_PORT(3); + else + offset = CORE_CFP_DATA_PORT(3); + + reg = core_readl(priv, offset); + /* src port [15:8] */ + src_dst_port = reg << 8; + + if (mask) + offset = CORE_CFP_MASK_PORT(2); + else + offset = CORE_CFP_DATA_PORT(2); + + reg = core_readl(priv, offset); + /* src port [7:0] */ + src_dst_port |= (reg >> 24); + + v4_spec->pdst = cpu_to_be16(src_dst_port); + v4_spec->psrc = cpu_to_be16((u16)(reg >> 8)); + + /* IPv4 dst [15:8] */ + ipv4 = (reg & 0xff) << 8; + + if (mask) + offset = CORE_CFP_MASK_PORT(1); + else + offset = CORE_CFP_DATA_PORT(1); + + reg = core_readl(priv, offset); + /* IPv4 dst [31:16] */ + ipv4 |= ((reg >> 8) & 0xffff) << 16; + /* IPv4 dst [7:0] */ + ipv4 |= (reg >> 24) & 0xff; + v4_spec->ip4dst = cpu_to_be32(ipv4); + + /* IPv4 src [15:8] */ + ipv4 = (reg & 0xff) << 8; + + if (mask) + offset = CORE_CFP_MASK_PORT(0); + else + offset = CORE_CFP_DATA_PORT(0); + reg = core_readl(priv, offset); + + /* Once the TCAM is programmed, the mask reflects the slice number + * being matched, don't bother checking it when reading back the + * mask spec + */ + if (!mask && !(reg & SLICE_VALID)) + return -EINVAL; + + /* IPv4 src [7:0] */ + ipv4 |= (reg >> 24) & 0xff; + /* IPv4 src [31:16] */ + ipv4 |= ((reg >> 8) & 0xffff) << 16; + v4_spec->ip4src = cpu_to_be32(ipv4); + + return 0; +} + +static int bcm_sf2_cfp_ipv4_rule_get(struct bcm_sf2_priv *priv, int port, + struct ethtool_rx_flow_spec *fs) +{ + struct ethtool_tcpip4_spec *v4_spec = NULL, *v4_m_spec = NULL; + u32 reg; + int ret; + + reg = core_readl(priv, CORE_CFP_DATA_PORT(6)); + + switch ((reg & IPPROTO_MASK) >> IPPROTO_SHIFT) { + case IPPROTO_TCP: + fs->flow_type = TCP_V4_FLOW; + v4_spec = &fs->h_u.tcp_ip4_spec; + v4_m_spec = &fs->m_u.tcp_ip4_spec; + break; + case IPPROTO_UDP: + fs->flow_type = UDP_V4_FLOW; + v4_spec = &fs->h_u.udp_ip4_spec; + v4_m_spec = &fs->m_u.udp_ip4_spec; + break; + default: + return -EINVAL; + } + + fs->m_ext.data[0] = cpu_to_be32((reg >> IP_FRAG_SHIFT) & 1); + v4_spec->tos = (reg >> IPTOS_SHIFT) & IPTOS_MASK; + + ret = bcm_sf2_cfp_unslice_ipv4(priv, v4_spec, false); + if (ret) + return ret; + + return bcm_sf2_cfp_unslice_ipv4(priv, v4_m_spec, true); +} + +static int bcm_sf2_cfp_unslice_ipv6(struct bcm_sf2_priv *priv, + __be32 *ip6_addr, __be16 *port, + bool mask) +{ + u32 reg, tmp, offset; + + /* C-Tag [31:24] + * UDF_n_B8 [23:8] (port) + * UDF_n_B7 (upper) [7:0] (addr[15:8]) + */ + if (mask) + offset = CORE_CFP_MASK_PORT(4); + else + offset = CORE_CFP_DATA_PORT(4); + reg = core_readl(priv, offset); + *port = cpu_to_be32(reg) >> 8; + tmp = (u32)(reg & 0xff) << 8; + + /* UDF_n_B7 (lower) [31:24] (addr[7:0]) + * UDF_n_B6 [23:8] (addr[31:16]) + * UDF_n_B5 (upper) [7:0] (addr[47:40]) + */ + if (mask) + offset = CORE_CFP_MASK_PORT(3); + else + offset = CORE_CFP_DATA_PORT(3); + reg = core_readl(priv, offset); + tmp |= (reg >> 24) & 0xff; + tmp |= (u32)((reg >> 8) << 16); + ip6_addr[3] = cpu_to_be32(tmp); + tmp = (u32)(reg & 0xff) << 8; + + /* UDF_n_B5 (lower) [31:24] (addr[39:32]) + * UDF_n_B4 [23:8] (addr[63:48]) + * UDF_n_B3 (upper) [7:0] (addr[79:72]) + */ + if (mask) + offset = CORE_CFP_MASK_PORT(2); + else + offset = CORE_CFP_DATA_PORT(2); + reg = core_readl(priv, offset); + tmp |= (reg >> 24) & 0xff; + tmp |= (u32)((reg >> 8) << 16); + ip6_addr[2] = cpu_to_be32(tmp); + tmp = (u32)(reg & 0xff) << 8; + + /* UDF_n_B3 (lower) [31:24] (addr[71:64]) + * UDF_n_B2 [23:8] (addr[95:80]) + * UDF_n_B1 (upper) [7:0] (addr[111:104]) + */ + if (mask) + offset = CORE_CFP_MASK_PORT(1); + else + offset = CORE_CFP_DATA_PORT(1); + reg = core_readl(priv, offset); + tmp |= (reg >> 24) & 0xff; + tmp |= (u32)((reg >> 8) << 16); + ip6_addr[1] = cpu_to_be32(tmp); + tmp = (u32)(reg & 0xff) << 8; + + /* UDF_n_B1 (lower) [31:24] (addr[103:96]) + * UDF_n_B0 [23:8] (addr[127:112]) + * Reserved [7:4] + * Slice ID [3:2] + * Slice valid [1:0] + */ + if (mask) + offset = CORE_CFP_MASK_PORT(0); + else + offset = CORE_CFP_DATA_PORT(0); + reg = core_readl(priv, offset); + tmp |= (reg >> 24) & 0xff; + tmp |= (u32)((reg >> 8) << 16); + ip6_addr[0] = cpu_to_be32(tmp); + + if (!mask && !(reg & SLICE_VALID)) + return -EINVAL; + + return 0; +} + +static int bcm_sf2_cfp_ipv6_rule_get(struct bcm_sf2_priv *priv, int port, + struct ethtool_rx_flow_spec *fs, + u32 next_loc) +{ + struct ethtool_tcpip6_spec *v6_spec = NULL, *v6_m_spec = NULL; + u32 reg; + int ret; + + /* UDPv6 and TCPv6 both use ethtool_tcpip6_spec so we are fine + * assuming tcp_ip6_spec here being an union. + */ + v6_spec = &fs->h_u.tcp_ip6_spec; + v6_m_spec = &fs->m_u.tcp_ip6_spec; + + /* Read the second half first */ + ret = bcm_sf2_cfp_unslice_ipv6(priv, v6_spec->ip6dst, &v6_spec->pdst, + false); + if (ret) + return ret; + + ret = bcm_sf2_cfp_unslice_ipv6(priv, v6_m_spec->ip6dst, + &v6_m_spec->pdst, true); + if (ret) + return ret; + + /* Read last to avoid next entry clobbering the results during search + * operations. We would not have the port enabled for this rule, so + * don't bother checking it. + */ + (void)core_readl(priv, CORE_CFP_DATA_PORT(7)); + + /* The slice number is valid, so read the rule we are chained from now + * which is our first half. + */ + bcm_sf2_cfp_rule_addr_set(priv, next_loc); + ret = bcm_sf2_cfp_op(priv, OP_SEL_READ | TCAM_SEL); + if (ret) + return ret; + + reg = core_readl(priv, CORE_CFP_DATA_PORT(6)); + + switch ((reg & IPPROTO_MASK) >> IPPROTO_SHIFT) { + case IPPROTO_TCP: + fs->flow_type = TCP_V6_FLOW; + break; + case IPPROTO_UDP: + fs->flow_type = UDP_V6_FLOW; + break; + default: + return -EINVAL; + } + + ret = bcm_sf2_cfp_unslice_ipv6(priv, v6_spec->ip6src, &v6_spec->psrc, + false); + if (ret) + return ret; + + return bcm_sf2_cfp_unslice_ipv6(priv, v6_m_spec->ip6src, + &v6_m_spec->psrc, true); +} + +static int bcm_sf2_cfp_rule_get(struct bcm_sf2_priv *priv, int port, + struct ethtool_rxnfc *nfc) +{ + u32 reg, ipv4_or_chain_id; + unsigned int queue_num; + int ret; + + bcm_sf2_cfp_rule_addr_set(priv, nfc->fs.location); + + ret = bcm_sf2_cfp_op(priv, OP_SEL_READ | ACT_POL_RAM); + if (ret) + return ret; + + reg = core_readl(priv, CORE_ACT_POL_DATA0); + + ret = bcm_sf2_cfp_op(priv, OP_SEL_READ | TCAM_SEL); + if (ret) + return ret; + + /* Extract the destination port */ + nfc->fs.ring_cookie = fls((reg >> DST_MAP_IB_SHIFT) & + DST_MAP_IB_MASK) - 1; + + /* There is no Port 6, so we compensate for that here */ + if (nfc->fs.ring_cookie >= 6) + nfc->fs.ring_cookie++; + nfc->fs.ring_cookie *= SF2_NUM_EGRESS_QUEUES; + + /* Extract the destination queue */ + queue_num = (reg >> NEW_TC_SHIFT) & NEW_TC_MASK; + nfc->fs.ring_cookie += queue_num; + + /* Extract the L3_FRAMING or CHAIN_ID */ + reg = core_readl(priv, CORE_CFP_DATA_PORT(6)); + + /* With IPv6 rules this would contain a non-zero chain ID since + * we reserve entry 0 and it cannot be used. So if we read 0 here + * this means an IPv4 rule. + */ + ipv4_or_chain_id = (reg >> L3_FRAMING_SHIFT) & 0xff; + if (ipv4_or_chain_id == 0) + ret = bcm_sf2_cfp_ipv4_rule_get(priv, port, &nfc->fs); + else + ret = bcm_sf2_cfp_ipv6_rule_get(priv, port, &nfc->fs, + ipv4_or_chain_id); + if (ret) + return ret; + + /* Read last to avoid next entry clobbering the results during search + * operations + */ + reg = core_readl(priv, CORE_CFP_DATA_PORT(7)); + if (!(reg & 1 << port)) + return -EINVAL; + + bcm_sf2_invert_masks(&nfc->fs); + + /* Put the TCAM size here */ + nfc->data = bcm_sf2_cfp_rule_size(priv); + + return 0; +} + +/* We implement the search doing a TCAM search operation */ +static int bcm_sf2_cfp_rule_get_all(struct bcm_sf2_priv *priv, + int port, struct ethtool_rxnfc *nfc, + u32 *rule_locs) +{ + unsigned int index = 1, rules_cnt = 0; + + for_each_set_bit_from(index, priv->cfp.unique, priv->num_cfp_rules) { + rule_locs[rules_cnt] = index; + rules_cnt++; + } + + /* Put the TCAM size here */ + nfc->data = bcm_sf2_cfp_rule_size(priv); + nfc->rule_cnt = rules_cnt; + + return 0; +} + +int bcm_sf2_get_rxnfc(struct dsa_switch *ds, int port, + struct ethtool_rxnfc *nfc, u32 *rule_locs) +{ + struct net_device *p = ds->ports[port].cpu_dp->master; + struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds); + int ret = 0; + + mutex_lock(&priv->cfp.lock); + + switch (nfc->cmd) { + case ETHTOOL_GRXCLSRLCNT: + /* Subtract the default, unusable rule */ + nfc->rule_cnt = bitmap_weight(priv->cfp.unique, + priv->num_cfp_rules) - 1; + /* We support specifying rule locations */ + nfc->data |= RX_CLS_LOC_SPECIAL; + break; + case ETHTOOL_GRXCLSRULE: + ret = bcm_sf2_cfp_rule_get(priv, port, nfc); + break; + case ETHTOOL_GRXCLSRLALL: + ret = bcm_sf2_cfp_rule_get_all(priv, port, nfc, rule_locs); + break; + default: + ret = -EOPNOTSUPP; + break; + } + + mutex_unlock(&priv->cfp.lock); + + if (ret) + return ret; + + /* Pass up the commands to the attached master network device */ + if (p->ethtool_ops->get_rxnfc) { + ret = p->ethtool_ops->get_rxnfc(p, nfc, rule_locs); + if (ret == -EOPNOTSUPP) + ret = 0; + } + + return ret; +} + +int bcm_sf2_set_rxnfc(struct dsa_switch *ds, int port, + struct ethtool_rxnfc *nfc) +{ + struct net_device *p = ds->ports[port].cpu_dp->master; + struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds); + int ret = 0; + + mutex_lock(&priv->cfp.lock); + + switch (nfc->cmd) { + case ETHTOOL_SRXCLSRLINS: + ret = bcm_sf2_cfp_rule_set(ds, port, &nfc->fs); + break; + + case ETHTOOL_SRXCLSRLDEL: + ret = bcm_sf2_cfp_rule_del(priv, port, nfc->fs.location); + break; + default: + ret = -EOPNOTSUPP; + break; + } + + mutex_unlock(&priv->cfp.lock); + + if (ret) + return ret; + + /* Pass up the commands to the attached master network device. + * This can fail, so rollback the operation if we need to. + */ + if (p->ethtool_ops->set_rxnfc) { + ret = p->ethtool_ops->set_rxnfc(p, nfc); + if (ret && ret != -EOPNOTSUPP) { + mutex_lock(&priv->cfp.lock); + bcm_sf2_cfp_rule_del(priv, port, nfc->fs.location); + mutex_unlock(&priv->cfp.lock); + } else { + ret = 0; + } + } + + return ret; +} + +int bcm_sf2_cfp_rst(struct bcm_sf2_priv *priv) +{ + unsigned int timeout = 1000; + u32 reg; + + reg = core_readl(priv, CORE_CFP_ACC); + reg |= TCAM_RESET; + core_writel(priv, reg, CORE_CFP_ACC); + + do { + reg = core_readl(priv, CORE_CFP_ACC); + if (!(reg & TCAM_RESET)) + break; + + cpu_relax(); + } while (timeout--); + + if (!timeout) + return -ETIMEDOUT; + + return 0; +} |