From 8e3d04fd7d70679eed631ba5889f81b2d9415404 Mon Sep 17 00:00:00 2001 From: Hariprasad Shenai Date: Thu, 13 Aug 2015 09:44:22 +0530 Subject: [PATCH] cxgb4: Add MPS tracing support Handle TRACE_PKT, stack can sniff them on the first port Add debubfs enrty to configure tracing for offload traffic like iWARP & iSCSI for debugging purpose. Signed-off-by: Hariprasad Shenai Signed-off-by: David S. Miller --- drivers/net/ethernet/chelsio/cxgb4/cxgb4.h | 8 + .../ethernet/chelsio/cxgb4/cxgb4_debugfs.c | 298 ++++++++++++++++++ drivers/net/ethernet/chelsio/cxgb4/t4_hw.c | 113 +++++++ drivers/net/ethernet/chelsio/cxgb4/t4_regs.h | 56 ++++ 4 files changed, 475 insertions(+) diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h index 58de4443eac0..3c99454aac0a 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h @@ -768,6 +768,10 @@ struct adapter { struct dentry *debugfs_root; u32 use_bd; /* Use SGE Back Door intfc for reading SGE Contexts */ + u32 trace_rss; /* 1 implies that different RSS flit per filter is + * used per filter else if 0 default RSS flit is + * used for all 4 filters. + */ spinlock_t stats_lock; spinlock_t win0_lock ____cacheline_aligned_in_smp; @@ -1441,6 +1445,10 @@ int t4_sge_ctxt_flush(struct adapter *adap, unsigned int mbox); int t4_handle_fw_rpl(struct adapter *adap, const __be64 *rpl); void t4_db_full(struct adapter *adapter); void t4_db_dropped(struct adapter *adapter); +int t4_set_trace_filter(struct adapter *adapter, const struct trace_params *tp, + int filter_index, int enable); +void t4_get_trace_filter(struct adapter *adapter, struct trace_params *tp, + int filter_index, int *enabled); int t4_fwaddrspace_write(struct adapter *adap, unsigned int mbox, u32 addr, u32 val); void t4_sge_decode_idma_state(struct adapter *adapter, int state); diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c index 6700dcc9960e..1732e29253cd 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c @@ -1201,6 +1201,298 @@ static const struct file_operations mbox_debugfs_fops = { .write = mbox_write }; +static int mps_trc_show(struct seq_file *seq, void *v) +{ + int enabled, i; + struct trace_params tp; + unsigned int trcidx = (uintptr_t)seq->private & 3; + struct adapter *adap = seq->private - trcidx; + + t4_get_trace_filter(adap, &tp, trcidx, &enabled); + if (!enabled) { + seq_puts(seq, "tracer is disabled\n"); + return 0; + } + + if (tp.skip_ofst * 8 >= TRACE_LEN) { + dev_err(adap->pdev_dev, "illegal trace pattern skip offset\n"); + return -EINVAL; + } + if (tp.port < 8) { + i = adap->chan_map[tp.port & 3]; + if (i >= MAX_NPORTS) { + dev_err(adap->pdev_dev, "tracer %u is assigned " + "to non-existing port\n", trcidx); + return -EINVAL; + } + seq_printf(seq, "tracer is capturing %s %s, ", + adap->port[i]->name, tp.port < 4 ? "Rx" : "Tx"); + } else + seq_printf(seq, "tracer is capturing loopback %d, ", + tp.port - 8); + seq_printf(seq, "snap length: %u, min length: %u\n", tp.snap_len, + tp.min_len); + seq_printf(seq, "packets captured %smatch filter\n", + tp.invert ? "do not " : ""); + + if (tp.skip_ofst) { + seq_puts(seq, "filter pattern: "); + for (i = 0; i < tp.skip_ofst * 2; i += 2) + seq_printf(seq, "%08x%08x", tp.data[i], tp.data[i + 1]); + seq_putc(seq, '/'); + for (i = 0; i < tp.skip_ofst * 2; i += 2) + seq_printf(seq, "%08x%08x", tp.mask[i], tp.mask[i + 1]); + seq_puts(seq, "@0\n"); + } + + seq_puts(seq, "filter pattern: "); + for (i = tp.skip_ofst * 2; i < TRACE_LEN / 4; i += 2) + seq_printf(seq, "%08x%08x", tp.data[i], tp.data[i + 1]); + seq_putc(seq, '/'); + for (i = tp.skip_ofst * 2; i < TRACE_LEN / 4; i += 2) + seq_printf(seq, "%08x%08x", tp.mask[i], tp.mask[i + 1]); + seq_printf(seq, "@%u\n", (tp.skip_ofst + tp.skip_len) * 8); + return 0; +} + +static int mps_trc_open(struct inode *inode, struct file *file) +{ + return single_open(file, mps_trc_show, inode->i_private); +} + +static unsigned int xdigit2int(unsigned char c) +{ + return isdigit(c) ? c - '0' : tolower(c) - 'a' + 10; +} + +#define TRC_PORT_NONE 0xff +#define TRC_RSS_ENABLE 0x33 +#define TRC_RSS_DISABLE 0x13 + +/* Set an MPS trace filter. Syntax is: + * + * disable + * + * to disable tracing, or + * + * interface qid= [snaplen=] [minlen=] [not] []... + * + * where interface is one of rxN, txN, or loopbackN, N = 0..3, qid can be one + * of the NIC's response qid obtained from sge_qinfo and pattern has the form + * + * [/][@] + * + * Up to 2 filter patterns can be specified. If 2 are supplied the first one + * must be anchored at 0. An omited mask is taken as a mask of 1s, an omitted + * anchor is taken as 0. + */ +static ssize_t mps_trc_write(struct file *file, const char __user *buf, + size_t count, loff_t *pos) +{ + int i, j, enable, ret; + u32 *data, *mask; + struct trace_params tp; + const struct inode *ino; + unsigned int trcidx; + char *s, *p, *word, *end; + struct adapter *adap; + + ino = file_inode(file); + trcidx = (uintptr_t)ino->i_private & 3; + adap = ino->i_private - trcidx; + + /* Don't accept input more than 1K, can't be anything valid except lots + * of whitespace. Well, use less. + */ + if (count > 1024) + return -EFBIG; + p = s = kzalloc(count + 1, GFP_USER); + if (!s) + return -ENOMEM; + if (copy_from_user(s, buf, count)) { + count = -EFAULT; + goto out; + } + + if (s[count - 1] == '\n') + s[count - 1] = '\0'; + + enable = strcmp("disable", s) != 0; + if (!enable) + goto apply; + + /* enable or disable trace multi rss filter */ + if (adap->trace_rss) + t4_write_reg(adap, MPS_TRC_CFG_A, TRC_RSS_ENABLE); + else + t4_write_reg(adap, MPS_TRC_CFG_A, TRC_RSS_DISABLE); + + memset(&tp, 0, sizeof(tp)); + tp.port = TRC_PORT_NONE; + i = 0; /* counts pattern nibbles */ + + while (p) { + while (isspace(*p)) + p++; + word = strsep(&p, " "); + if (!*word) + break; + + if (!strncmp(word, "qid=", 4)) { + end = (char *)word + 4; + ret = kstrtoul(end, 10, (unsigned long *)&j); + if (ret) + goto out; + if (!adap->trace_rss) { + t4_write_reg(adap, MPS_T5_TRC_RSS_CONTROL_A, j); + continue; + } + + switch (trcidx) { + case 0: + t4_write_reg(adap, MPS_TRC_RSS_CONTROL_A, j); + break; + case 1: + t4_write_reg(adap, + MPS_TRC_FILTER1_RSS_CONTROL_A, j); + break; + case 2: + t4_write_reg(adap, + MPS_TRC_FILTER2_RSS_CONTROL_A, j); + break; + case 3: + t4_write_reg(adap, + MPS_TRC_FILTER3_RSS_CONTROL_A, j); + break; + } + continue; + } + if (!strncmp(word, "snaplen=", 8)) { + end = (char *)word + 8; + ret = kstrtoul(end, 10, (unsigned long *)&j); + if (ret || j > 9600) { +inval: count = -EINVAL; + goto out; + } + tp.snap_len = j; + continue; + } + if (!strncmp(word, "minlen=", 7)) { + end = (char *)word + 7; + ret = kstrtoul(end, 10, (unsigned long *)&j); + if (ret || j > TFMINPKTSIZE_M) + goto inval; + tp.min_len = j; + continue; + } + if (!strcmp(word, "not")) { + tp.invert = !tp.invert; + continue; + } + if (!strncmp(word, "loopback", 8) && tp.port == TRC_PORT_NONE) { + if (word[8] < '0' || word[8] > '3' || word[9]) + goto inval; + tp.port = word[8] - '0' + 8; + continue; + } + if (!strncmp(word, "tx", 2) && tp.port == TRC_PORT_NONE) { + if (word[2] < '0' || word[2] > '3' || word[3]) + goto inval; + tp.port = word[2] - '0' + 4; + if (adap->chan_map[tp.port & 3] >= MAX_NPORTS) + goto inval; + continue; + } + if (!strncmp(word, "rx", 2) && tp.port == TRC_PORT_NONE) { + if (word[2] < '0' || word[2] > '3' || word[3]) + goto inval; + tp.port = word[2] - '0'; + if (adap->chan_map[tp.port] >= MAX_NPORTS) + goto inval; + continue; + } + if (!isxdigit(*word)) + goto inval; + + /* we have found a trace pattern */ + if (i) { /* split pattern */ + if (tp.skip_len) /* too many splits */ + goto inval; + tp.skip_ofst = i / 16; + } + + data = &tp.data[i / 8]; + mask = &tp.mask[i / 8]; + j = i; + + while (isxdigit(*word)) { + if (i >= TRACE_LEN * 2) { + count = -EFBIG; + goto out; + } + *data = (*data << 4) + xdigit2int(*word++); + if (++i % 8 == 0) + data++; + } + if (*word == '/') { + word++; + while (isxdigit(*word)) { + if (j >= i) /* mask longer than data */ + goto inval; + *mask = (*mask << 4) + xdigit2int(*word++); + if (++j % 8 == 0) + mask++; + } + if (i != j) /* mask shorter than data */ + goto inval; + } else { /* no mask, use all 1s */ + for ( ; i - j >= 8; j += 8) + *mask++ = 0xffffffff; + if (i % 8) + *mask = (1 << (i % 8) * 4) - 1; + } + if (*word == '@') { + end = (char *)word + 1; + ret = kstrtoul(end, 10, (unsigned long *)&j); + if (*end && *end != '\n') + goto inval; + if (j & 7) /* doesn't start at multiple of 8 */ + goto inval; + j /= 8; + if (j < tp.skip_ofst) /* overlaps earlier pattern */ + goto inval; + if (j - tp.skip_ofst > 31) /* skip too big */ + goto inval; + tp.skip_len = j - tp.skip_ofst; + } + if (i % 8) { + *data <<= (8 - i % 8) * 4; + *mask <<= (8 - i % 8) * 4; + i = (i + 15) & ~15; /* 8-byte align */ + } + } + + if (tp.port == TRC_PORT_NONE) + goto inval; + +apply: + i = t4_set_trace_filter(adap, &tp, trcidx, enable); + if (i) + count = i; +out: + kfree(s); + return count; +} + +static const struct file_operations mps_trc_debugfs_fops = { + .owner = THIS_MODULE, + .open = mps_trc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, + .write = mps_trc_write +}; + static ssize_t flash_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { @@ -2708,6 +3000,10 @@ int t4_setup_debugfs(struct adapter *adap) { "mbox5", &mbox_debugfs_fops, S_IRUSR | S_IWUSR, 5 }, { "mbox6", &mbox_debugfs_fops, S_IRUSR | S_IWUSR, 6 }, { "mbox7", &mbox_debugfs_fops, S_IRUSR | S_IWUSR, 7 }, + { "trace0", &mps_trc_debugfs_fops, S_IRUSR | S_IWUSR, 0 }, + { "trace1", &mps_trc_debugfs_fops, S_IRUSR | S_IWUSR, 1 }, + { "trace2", &mps_trc_debugfs_fops, S_IRUSR | S_IWUSR, 2 }, + { "trace3", &mps_trc_debugfs_fops, S_IRUSR | S_IWUSR, 3 }, { "l2t", &t4_l2t_fops, S_IRUSR, 0}, { "mps_tcam", &mps_tcam_debugfs_fops, S_IRUSR, 0 }, { "rss", &rss_debugfs_fops, S_IRUSR, 0 }, @@ -2789,6 +3085,8 @@ int t4_setup_debugfs(struct adapter *adap) &flash_debugfs_fops, adap->params.sf_size); debugfs_create_bool("use_backdoor", S_IWUSR | S_IRUSR, adap->debugfs_root, &adap->use_bd); + debugfs_create_bool("trace_rss", S_IWUSR | S_IRUSR, + adap->debugfs_root, &adap->trace_rss); return 0; } diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c index 91750ad580ae..ac368efe2862 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c +++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c @@ -4264,6 +4264,119 @@ void t4_get_chan_txrate(struct adapter *adap, u64 *nic_rate, u64 *ofld_rate) } } +/** + * t4_set_trace_filter - configure one of the tracing filters + * @adap: the adapter + * @tp: the desired trace filter parameters + * @idx: which filter to configure + * @enable: whether to enable or disable the filter + * + * Configures one of the tracing filters available in HW. If @enable is + * %0 @tp is not examined and may be %NULL. The user is responsible to + * set the single/multiple trace mode by writing to MPS_TRC_CFG_A register + */ +int t4_set_trace_filter(struct adapter *adap, const struct trace_params *tp, + int idx, int enable) +{ + int i, ofst = idx * 4; + u32 data_reg, mask_reg, cfg; + u32 multitrc = TRCMULTIFILTER_F; + + if (!enable) { + t4_write_reg(adap, MPS_TRC_FILTER_MATCH_CTL_A_A + ofst, 0); + return 0; + } + + cfg = t4_read_reg(adap, MPS_TRC_CFG_A); + if (cfg & TRCMULTIFILTER_F) { + /* If multiple tracers are enabled, then maximum + * capture size is 2.5KB (FIFO size of a single channel) + * minus 2 flits for CPL_TRACE_PKT header. + */ + if (tp->snap_len > ((10 * 1024 / 4) - (2 * 8))) + return -EINVAL; + } else { + /* If multiple tracers are disabled, to avoid deadlocks + * maximum packet capture size of 9600 bytes is recommended. + * Also in this mode, only trace0 can be enabled and running. + */ + multitrc = 0; + if (tp->snap_len > 9600 || idx) + return -EINVAL; + } + + if (tp->port > (is_t4(adap->params.chip) ? 11 : 19) || tp->invert > 1 || + tp->skip_len > TFLENGTH_M || tp->skip_ofst > TFOFFSET_M || + tp->min_len > TFMINPKTSIZE_M) + return -EINVAL; + + /* stop the tracer we'll be changing */ + t4_write_reg(adap, MPS_TRC_FILTER_MATCH_CTL_A_A + ofst, 0); + + idx *= (MPS_TRC_FILTER1_MATCH_A - MPS_TRC_FILTER0_MATCH_A); + data_reg = MPS_TRC_FILTER0_MATCH_A + idx; + mask_reg = MPS_TRC_FILTER0_DONT_CARE_A + idx; + + for (i = 0; i < TRACE_LEN / 4; i++, data_reg += 4, mask_reg += 4) { + t4_write_reg(adap, data_reg, tp->data[i]); + t4_write_reg(adap, mask_reg, ~tp->mask[i]); + } + t4_write_reg(adap, MPS_TRC_FILTER_MATCH_CTL_B_A + ofst, + TFCAPTUREMAX_V(tp->snap_len) | + TFMINPKTSIZE_V(tp->min_len)); + t4_write_reg(adap, MPS_TRC_FILTER_MATCH_CTL_A_A + ofst, + TFOFFSET_V(tp->skip_ofst) | TFLENGTH_V(tp->skip_len) | + (is_t4(adap->params.chip) ? + TFPORT_V(tp->port) | TFEN_F | TFINVERTMATCH_V(tp->invert) : + T5_TFPORT_V(tp->port) | T5_TFEN_F | + T5_TFINVERTMATCH_V(tp->invert))); + + return 0; +} + +/** + * t4_get_trace_filter - query one of the tracing filters + * @adap: the adapter + * @tp: the current trace filter parameters + * @idx: which trace filter to query + * @enabled: non-zero if the filter is enabled + * + * Returns the current settings of one of the HW tracing filters. + */ +void t4_get_trace_filter(struct adapter *adap, struct trace_params *tp, int idx, + int *enabled) +{ + u32 ctla, ctlb; + int i, ofst = idx * 4; + u32 data_reg, mask_reg; + + ctla = t4_read_reg(adap, MPS_TRC_FILTER_MATCH_CTL_A_A + ofst); + ctlb = t4_read_reg(adap, MPS_TRC_FILTER_MATCH_CTL_B_A + ofst); + + if (is_t4(adap->params.chip)) { + *enabled = !!(ctla & TFEN_F); + tp->port = TFPORT_G(ctla); + tp->invert = !!(ctla & TFINVERTMATCH_F); + } else { + *enabled = !!(ctla & T5_TFEN_F); + tp->port = T5_TFPORT_G(ctla); + tp->invert = !!(ctla & T5_TFINVERTMATCH_F); + } + tp->snap_len = TFCAPTUREMAX_G(ctlb); + tp->min_len = TFMINPKTSIZE_G(ctlb); + tp->skip_ofst = TFOFFSET_G(ctla); + tp->skip_len = TFLENGTH_G(ctla); + + ofst = (MPS_TRC_FILTER1_MATCH_A - MPS_TRC_FILTER0_MATCH_A) * idx; + data_reg = MPS_TRC_FILTER0_MATCH_A + ofst; + mask_reg = MPS_TRC_FILTER0_DONT_CARE_A + ofst; + + for (i = 0; i < TRACE_LEN / 4; i++, data_reg += 4, mask_reg += 4) { + tp->mask[i] = ~t4_read_reg(adap, mask_reg); + tp->data[i] = t4_read_reg(adap, data_reg) & tp->mask[i]; + } +} + /** * t4_pmtx_get_stats - returns the HW stats from PMTX * @adap: the adapter diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h index 4d2c9290c7dd..fc3044c8ac1c 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h +++ b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h @@ -1886,6 +1886,9 @@ #define TRCMULTIFILTER_F TRCMULTIFILTER_V(1U) #define MPS_TRC_RSS_CONTROL_A 0x9808 +#define MPS_TRC_FILTER1_RSS_CONTROL_A 0x9ff4 +#define MPS_TRC_FILTER2_RSS_CONTROL_A 0x9ffc +#define MPS_TRC_FILTER3_RSS_CONTROL_A 0xa004 #define MPS_T5_TRC_RSS_CONTROL_A 0xa00c #define RSSCONTROL_S 16 @@ -1894,6 +1897,59 @@ #define QUEUENUMBER_S 0 #define QUEUENUMBER_V(x) ((x) << QUEUENUMBER_S) +#define TFINVERTMATCH_S 24 +#define TFINVERTMATCH_V(x) ((x) << TFINVERTMATCH_S) +#define TFINVERTMATCH_F TFINVERTMATCH_V(1U) + +#define TFEN_S 22 +#define TFEN_V(x) ((x) << TFEN_S) +#define TFEN_F TFEN_V(1U) + +#define TFPORT_S 18 +#define TFPORT_M 0xfU +#define TFPORT_V(x) ((x) << TFPORT_S) +#define TFPORT_G(x) (((x) >> TFPORT_S) & TFPORT_M) + +#define TFLENGTH_S 8 +#define TFLENGTH_M 0x1fU +#define TFLENGTH_V(x) ((x) << TFLENGTH_S) +#define TFLENGTH_G(x) (((x) >> TFLENGTH_S) & TFLENGTH_M) + +#define TFOFFSET_S 0 +#define TFOFFSET_M 0x1fU +#define TFOFFSET_V(x) ((x) << TFOFFSET_S) +#define TFOFFSET_G(x) (((x) >> TFOFFSET_S) & TFOFFSET_M) + +#define T5_TFINVERTMATCH_S 25 +#define T5_TFINVERTMATCH_V(x) ((x) << T5_TFINVERTMATCH_S) +#define T5_TFINVERTMATCH_F T5_TFINVERTMATCH_V(1U) + +#define T5_TFEN_S 23 +#define T5_TFEN_V(x) ((x) << T5_TFEN_S) +#define T5_TFEN_F T5_TFEN_V(1U) + +#define T5_TFPORT_S 18 +#define T5_TFPORT_M 0x1fU +#define T5_TFPORT_V(x) ((x) << T5_TFPORT_S) +#define T5_TFPORT_G(x) (((x) >> T5_TFPORT_S) & T5_TFPORT_M) + +#define MPS_TRC_FILTER_MATCH_CTL_A_A 0x9810 +#define MPS_TRC_FILTER_MATCH_CTL_B_A 0x9820 + +#define TFMINPKTSIZE_S 16 +#define TFMINPKTSIZE_M 0x1ffU +#define TFMINPKTSIZE_V(x) ((x) << TFMINPKTSIZE_S) +#define TFMINPKTSIZE_G(x) (((x) >> TFMINPKTSIZE_S) & TFMINPKTSIZE_M) + +#define TFCAPTUREMAX_S 0 +#define TFCAPTUREMAX_M 0x3fffU +#define TFCAPTUREMAX_V(x) ((x) << TFCAPTUREMAX_S) +#define TFCAPTUREMAX_G(x) (((x) >> TFCAPTUREMAX_S) & TFCAPTUREMAX_M) + +#define MPS_TRC_FILTER0_MATCH_A 0x9c00 +#define MPS_TRC_FILTER0_DONT_CARE_A 0x9c80 +#define MPS_TRC_FILTER1_MATCH_A 0x9d00 + #define TP_RSS_CONFIG_A 0x7df0 #define TNL4TUPENIPV6_S 31 -- 2.20.1