Add debugfs support to dump filter debug information.

Signed-off-by: Rahul Lakkireddy <rahul.lakkire...@chelsio.com>
Signed-off-by: Hariprasad Shenai <haripra...@chelsio.com>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c |   4 +-
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c  | 415 +++++++++++++++++++++
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.h  |   2 +
 drivers/net/ethernet/chelsio/cxgb4/t4_values.h     |   5 +-
 4 files changed, 424 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c 
b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
index 91fb508..72cf3de2 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
@@ -1,7 +1,7 @@
 /*
  * This file is part of the Chelsio T4 Ethernet driver for Linux.
  *
- * Copyright (c) 2003-2014 Chelsio Communications, Inc. All rights reserved.
+ * Copyright (c) 2003-2016 Chelsio Communications, Inc. All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
@@ -45,6 +45,7 @@
 #include "cxgb4_debugfs.h"
 #include "clip_tbl.h"
 #include "l2t.h"
+#include "cxgb4_filter.h"
 
 /* generic seq_file support for showing a table of size rows x width. */
 static void *seq_tab_get_idx(struct seq_tab *tb, loff_t pos)
@@ -3272,6 +3273,7 @@ int t4_setup_debugfs(struct adapter *adap)
                { "tids", &tid_info_debugfs_fops, S_IRUSR, 0},
                { "blocked_fl", &blocked_fl_fops, S_IRUSR | S_IWUSR, 0 },
                { "meminfo", &meminfo_fops, S_IRUSR, 0 },
+               { "filters", &filters_debugfs_fops, S_IRUSR, 0 },
        };
 
        /* Debug FS nodes common to all T5 and later adapters.
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c 
b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
index 490bd94..51b6745 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
@@ -34,6 +34,7 @@
 
 #include "cxgb4.h"
 #include "t4_regs.h"
+#include "t4_values.h"
 #include "l2t.h"
 #include "t4fw_api.h"
 #include "cxgb4_filter.h"
@@ -669,3 +670,417 @@ void filter_rpl(struct adapter *adap, const struct 
cpl_set_tcb_rpl *rpl)
                        complete(&ctx->completion);
        }
 }
+
+/* Retrieve the packet count for the specified filter. */
+int cxgb4_get_filter_count(struct adapter *adapter, unsigned int fidx,
+                          u64 *c, int hash, bool get_byte)
+{
+       struct filter_entry *f;
+       unsigned int tcb_base, tcbaddr;
+       unsigned int max_ftids;
+       int ret;
+
+       tcb_base = t4_read_reg(adapter, TP_CMM_TCB_BASE_A);
+       max_ftids = adapter->tids.nftids;
+       if ((fidx != (max_ftids + adapter->tids.nsftids - 1)) &&
+           (fidx >= max_ftids))
+               return -E2BIG;
+
+       f = &adapter->tids.ftid_tab[fidx];
+       if (!f->valid)
+               return -EINVAL;
+
+       tcbaddr = tcb_base + f->tid * TCB_SIZE;
+
+       if (is_t4(adapter->params.chip)) {
+               /* For T4, the Filter Packet Hit Count is maintained as a
+                * 64-bit Big Endian value in the TCB fields
+                * {t_rtt_ts_recent_age, t_rtseq_recent} ... The format in
+                * memory is swizzled/mapped in a manner such that instead
+                * of having this 64-bit counter show up at offset 24
+                * ((TCB_T_RTT_TS_RECENT_AGE_W == 6) * sizeof(u32)), it
+                * actually shows up at offset 16. Hence the constant "4"
+                * below instead of TCB_T_RTT_TS_RECENT_AGE_W.
+                */
+               if (get_byte) {
+                       unsigned int word_offset = 4;
+                       __be64 be64_byte_count;
+
+                       spin_lock(&adapter->win0_lock);
+                       ret = t4_memory_rw(adapter, MEMWIN_NIC, MEM_EDC0,
+                                          tcbaddr +
+                                          (word_offset * sizeof(__be32)),
+                                          sizeof(be64_byte_count),
+                                          &be64_byte_count,
+                                          T4_MEMORY_READ);
+                       spin_unlock(&adapter->win0_lock);
+                       if (ret < 0)
+                               return ret;
+                       *c = be64_to_cpu(be64_byte_count);
+               } else {
+                       unsigned int word_offset = 4;
+                       __be64 be64_count;
+
+                       spin_lock(&adapter->win0_lock);
+                       ret = t4_memory_rw(adapter, MEMWIN_NIC, MEM_EDC0,
+                                          tcbaddr +
+                                          (word_offset * sizeof(__be32)),
+                                          sizeof(be64_count),
+                                          (__be32 *)&be64_count,
+                                          T4_MEMORY_READ);
+                       spin_unlock(&adapter->win0_lock);
+                       if (ret < 0)
+                               return ret;
+                       *c = be64_to_cpu(be64_count);
+               }
+       } else {
+               /* For T5, the Filter Packet Hit Count is maintained as a
+                * 32-bit Big Endian value in the TCB field {timestamp}.
+                * Instead of the filter hit count showing up at offset 20
+                * ((TCB_TIMESTAMP_W == 5) * sizeof(u32)), it actually shows
+                * up at offset 24.  Hence the constant "6" below.
+                */
+               if (get_byte) {
+                       unsigned int word_offset = 4;
+                       __be64 be64_byte_count;
+
+                       spin_lock(&adapter->win0_lock);
+                       ret = t4_memory_rw(adapter, MEMWIN_NIC, MEM_EDC0,
+                                          tcbaddr +
+                                          (word_offset * sizeof(__be32)),
+                                          sizeof(be64_byte_count),
+                                          &be64_byte_count,
+                                          T4_MEMORY_READ);
+                       spin_unlock(&adapter->win0_lock);
+                       if (ret < 0)
+                               return ret;
+                       *c = be64_to_cpu(be64_byte_count);
+               } else {
+                       unsigned int word_offset = 6;
+                       __be32 be32_count;
+
+                       spin_lock(&adapter->win0_lock);
+                       ret = t4_memory_rw(adapter, MEMWIN_NIC, MEM_EDC0,
+                                          tcbaddr +
+                                          (word_offset * sizeof(__be32)),
+                                          sizeof(be32_count), &be32_count,
+                                          T4_MEMORY_READ);
+                       spin_unlock(&adapter->win0_lock);
+                       if (ret < 0)
+                               return ret;
+                       *c = (u64)be32_to_cpu(be32_count);
+               }
+       }
+
+       return 0;
+}
+
+/* Filter Table. */
+static void filters_show_ipaddr(struct seq_file *seq,
+                               int type, u8 *addr, u8 *addrm)
+{
+       int noctets, octet;
+
+       seq_puts(seq, " ");
+       if (type == 0) {
+               noctets = 4;
+               seq_printf(seq, "%48s", " ");
+       } else {
+               noctets = 16;
+       }
+
+       for (octet = 0; octet < noctets; octet++)
+               seq_printf(seq, "%02x", addr[octet]);
+       seq_puts(seq, "/");
+       for (octet = 0; octet < noctets; octet++)
+               seq_printf(seq, "%02x", addrm[octet]);
+}
+
+static void filters_display(struct seq_file *seq, unsigned int fidx,
+                           struct filter_entry *f, int hash)
+{
+       struct adapter *adapter = seq->private;
+       u32 fconf = adapter->params.tp.vlan_pri_map;
+       u32 tpiconf = adapter->params.tp.ingress_config;
+       int i;
+
+       /* Filter index */
+       seq_printf(seq, "%4d%c%c", fidx,
+                  (!f->locked  ? ' ' : '!'),
+                  (!f->pending ? ' ' : (!f->valid ? '+' : '-')));
+
+       if (f->fs.hitcnts) {
+               u64 hitcnt;
+               int ret;
+
+               ret = cxgb4_get_filter_count(adapter, fidx, &hitcnt,
+                                            hash, false);
+               if (ret)
+                       seq_printf(seq, " %20s", "hits={ERROR}");
+               else
+                       seq_printf(seq, " %20llu", hitcnt);
+       } else {
+               seq_printf(seq, " %20s", "Disabled");
+       }
+
+       /* Compressed header portion of filter. */
+       for (i = FT_FIRST_S; i <= FT_LAST_S; i++) {
+               switch (fconf & (1 << i)) {
+               case 0:
+                       /* compressed filter field not enabled */
+                       break;
+
+               case FCOE_F:
+                       seq_printf(seq, "  %1d/%1d",
+                                  f->fs.val.fcoe, f->fs.mask.fcoe);
+                       break;
+
+               case PORT_F:
+                       seq_printf(seq, "  %1d/%1d",
+                                  f->fs.val.iport, f->fs.mask.iport);
+                       break;
+
+               case VNIC_ID_F:
+                       if ((tpiconf & VNIC_F) == 0)
+                               seq_printf(seq, " %1d:%04x/%1d:%04x",
+                                          f->fs.val.ovlan_vld,
+                                          f->fs.val.ovlan,
+                                          f->fs.mask.ovlan_vld,
+                                          f->fs.mask.ovlan);
+                       else
+                               seq_printf(seq, " %1d:%1x:%02x/%1d:%1x:%02x",
+                                          f->fs.val.ovlan_vld,
+                                          (f->fs.val.ovlan >> 13) & 0x7,
+                                          f->fs.val.ovlan & 0x7f,
+                                          f->fs.mask.ovlan_vld,
+                                          (f->fs.mask.ovlan >> 13) & 0x7,
+                                          f->fs.mask.ovlan & 0x7f);
+                       break;
+
+               case VLAN_F:
+                       seq_printf(seq, " %1d:%04x/%1d:%04x",
+                                  f->fs.val.ivlan_vld,
+                                  f->fs.val.ivlan,
+                                  f->fs.mask.ivlan_vld,
+                                  f->fs.mask.ivlan);
+                       break;
+
+               case TOS_F:
+                       seq_printf(seq, " %02x/%02x",
+                                  f->fs.val.tos, f->fs.mask.tos);
+                       break;
+
+               case PROTOCOL_F:
+                       seq_printf(seq, " %02x/%02x",
+                                  f->fs.val.proto, f->fs.mask.proto);
+                       break;
+
+               case ETHERTYPE_F:
+                       seq_printf(seq, " %04x/%04x",
+                                  f->fs.val.ethtype, f->fs.mask.ethtype);
+                       break;
+
+               case MACMATCH_F:
+                       seq_printf(seq, " %03x/%03x",
+                                  f->fs.val.macidx, f->fs.mask.macidx);
+                       break;
+
+               case MPSHITTYPE_F:
+                       seq_printf(seq, " %1x/%1x",
+                                  f->fs.val.matchtype,
+                                  f->fs.mask.matchtype);
+                       break;
+
+               case FRAGMENTATION_F:
+                       seq_printf(seq, "  %1d/%1d",
+                                  f->fs.val.frag, f->fs.mask.frag);
+                       break;
+               }
+       }
+
+       /* Fixed portion of filter. */
+       filters_show_ipaddr(seq, f->fs.type,
+                           f->fs.val.lip, f->fs.mask.lip);
+       filters_show_ipaddr(seq, f->fs.type,
+                           f->fs.val.fip, f->fs.mask.fip);
+       seq_printf(seq, " %04x/%04x %04x/%04x",
+                  f->fs.val.lport, f->fs.mask.lport,
+                  f->fs.val.fport, f->fs.mask.fport);
+
+       /* Variable length filter action. */
+       if (f->fs.action == FILTER_DROP) {
+               seq_puts(seq, " Drop");
+       } else if (f->fs.action == FILTER_SWITCH) {
+               seq_printf(seq, " Switch: port=%d", f->fs.eport);
+               if (f->fs.newdmac)
+                       seq_printf(seq,
+                                  ", dmac=%02x:%02x:%02x:%02x:%02x:%02x, 
l2tidx=%d",
+                                  f->fs.dmac[0], f->fs.dmac[1],
+                                  f->fs.dmac[2], f->fs.dmac[3],
+                                  f->fs.dmac[4], f->fs.dmac[5],
+                                  f->l2t->idx);
+               if (f->fs.newsmac)
+                       seq_printf(seq,
+                                  ", smac=%02x:%02x:%02x:%02x:%02x:%02x, 
smtidx=%d",
+                                  f->fs.smac[0], f->fs.smac[1],
+                                  f->fs.smac[2], f->fs.smac[3],
+                                  f->fs.smac[4], f->fs.smac[5],
+                                  f->smtidx);
+               if (f->fs.newvlan == VLAN_REMOVE)
+                       seq_puts(seq, ", vlan=none");
+               else if (f->fs.newvlan == VLAN_INSERT)
+                       seq_printf(seq, ", vlan=insert(%x)",
+                                  f->fs.vlan);
+               else if (f->fs.newvlan == VLAN_REWRITE)
+                       seq_printf(seq, ", vlan=rewrite(%x)",
+                                  f->fs.vlan);
+       } else {
+               seq_puts(seq, " Pass: Q=");
+               if (f->fs.dirsteer == 0) {
+                       seq_puts(seq, "RSS");
+                       if (f->fs.maskhash)
+                               seq_puts(seq, "(TCB=hash)");
+               } else {
+                       seq_printf(seq, "%d", f->fs.iq);
+                       if (f->fs.dirsteerhash == 0)
+                               seq_puts(seq, "(QID)");
+                       else
+                               seq_puts(seq, "(hash)");
+               }
+       }
+       if (f->fs.prio)
+               seq_puts(seq, " Prio");
+       if (f->fs.rpttid)
+               seq_puts(seq, " RptTID");
+       seq_puts(seq, "\n");
+}
+
+static int filters_show(struct seq_file *seq, void *v)
+{
+       struct adapter *adapter = seq->private;
+       u32 fconf = adapter->params.tp.vlan_pri_map;
+       u32 tpiconf = adapter->params.tp.ingress_config;
+       int i;
+
+       if (v == SEQ_START_TOKEN) {
+               seq_puts(seq, "[[Legend: '!' => locked; '+' => pending set; '-' 
=> pending clear]]\n");
+               seq_puts(seq, " Idx                   Hits");
+               for (i = FT_FIRST_S; i <= FT_LAST_S; i++) {
+                       switch (fconf & (1 << i)) {
+                       case 0:
+                               /* compressed filter field not enabled */
+                               break;
+
+                       case FCOE_F:
+                               seq_puts(seq, " FCoE");
+                               break;
+
+                       case PORT_F:
+                               seq_puts(seq, " Port");
+                               break;
+
+                       case VNIC_ID_F:
+                               if ((tpiconf & VNIC_F) == 0)
+                                       seq_puts(seq, "     vld:oVLAN");
+                               else
+                                       seq_puts(seq, "   VFvld:PF:VF");
+                               break;
+
+                       case VLAN_F:
+                               seq_puts(seq, "     vld:iVLAN");
+                               break;
+
+                       case TOS_F:
+                               seq_puts(seq, "   TOS");
+                               break;
+
+                       case PROTOCOL_F:
+                               seq_puts(seq, "  Prot");
+                               break;
+
+                       case ETHERTYPE_F:
+                               seq_puts(seq, "   EthType");
+                               break;
+
+                       case MACMATCH_F:
+                               seq_puts(seq, "  MACIdx");
+                               break;
+
+                       case MPSHITTYPE_F:
+                               seq_puts(seq, " MPS");
+                               break;
+
+                       case FRAGMENTATION_F:
+                               seq_puts(seq, " Frag");
+                               break;
+                       }
+               }
+               seq_printf(seq, " %65s %65s %9s %9s %s\n",
+                          "LIP", "FIP", "LPORT", "FPORT", "Action");
+       } else {
+               int fidx = (uintptr_t)v - 2;
+               struct filter_entry *f = &adapter->tids.ftid_tab[fidx];
+
+               /* if this entry isn't filled in just return */
+               if (!f->valid && !f->pending)
+                       return 0;
+
+               filters_display(seq, fidx, f, 0);
+       }
+       return 0;
+}
+
+static inline void *filters_get_idx(struct adapter *adapter, loff_t pos)
+{
+       if (pos > (adapter->tids.nftids + adapter->tids.nsftids))
+               return NULL;
+
+       return (void *)(uintptr_t)(pos + 1);
+}
+
+static void *filters_start(struct seq_file *seq, loff_t *pos)
+{
+       struct adapter *adapter = seq->private;
+
+       return *pos ? filters_get_idx(adapter, *pos) : SEQ_START_TOKEN;
+}
+
+static void *filters_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+       struct adapter *adapter = seq->private;
+
+       (*pos)++;
+       return filters_get_idx(adapter, *pos);
+}
+
+static void filters_stop(struct seq_file *seq, void *v)
+{
+}
+
+static const struct seq_operations filters_seq_ops = {
+       .start = filters_start,
+       .next  = filters_next,
+       .stop  = filters_stop,
+       .show  = filters_show
+};
+
+int filters_open(struct inode *inode, struct file *file)
+{
+       struct adapter *adapter = inode->i_private;
+       int res;
+
+       res = seq_open(file, &filters_seq_ops);
+       if (!res) {
+               struct seq_file *seq = file->private_data;
+
+               seq->private = adapter;
+       }
+       return res;
+}
+
+const struct file_operations filters_debugfs_fops = {
+       .owner   = THIS_MODULE,
+       .open    = filters_open,
+       .read    = seq_read,
+       .llseek  = seq_lseek,
+};
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.h 
b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.h
index 23742cb..e801e0b 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.h
@@ -37,6 +37,8 @@
 
 #include "t4_msg.h"
 
+extern const struct file_operations filters_debugfs_fops;
+
 void filter_rpl(struct adapter *adap, const struct cpl_set_tcb_rpl *rpl);
 void clear_filter(struct adapter *adap, struct filter_entry *f);
 
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_values.h 
b/drivers/net/ethernet/chelsio/cxgb4/t4_values.h
index 36cf307..0115222 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_values.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_values.h
@@ -1,7 +1,7 @@
 /*
  * This file is part of the Chelsio T4 Ethernet driver for Linux.
  *
- * Copyright (c) 2003-2014 Chelsio Communications, Inc. All rights reserved.
+ * Copyright (c) 2003-2016 Chelsio Communications, Inc. All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
@@ -121,6 +121,9 @@
  * selects for a particular field being present.  These fields, when present
  * in the Compressed Filter Tuple, have the following widths in bits.
  */
+#define FT_FIRST_S                      FCOE_S
+#define FT_LAST_S                       FRAGMENTATION_S
+
 #define FT_FCOE_W                       1
 #define FT_PORT_W                       3
 #define FT_VNIC_ID_W                    17
-- 
2.5.3

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