cxgb4: add support for mirror Rxqs

When mirror VI is enabled, allocate the mirror Rxqs and setup the
mirror VI RSS table. The mirror Rxqs are allocated/freed when
the mirror VI is created/destroyed or when underlying port is
brought up/down, respectively.

v3:
- Replace mirror VI refcount_t with normal u32 variable.

v2:
- Use mutex to protect all mirror VI data, instead of just
  mirror Rxqs.
- Remove the un-needed mirror Rxq mutex.

Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/cxgb4.h

@@ -711,6 +711,13 @@ enum {
 	ULP_CRYPTO_KTLS_INLINE  = 1 << 3,
 };
 
+#define CXGB4_MIRROR_RXQ_DEFAULT_DESC_NUM 1024
+#define CXGB4_MIRROR_RXQ_DEFAULT_DESC_SIZE 64
+#define CXGB4_MIRROR_RXQ_DEFAULT_INTR_USEC 5
+#define CXGB4_MIRROR_RXQ_DEFAULT_PKT_CNT 8
+
+#define CXGB4_MIRROR_FLQ_DEFAULT_DESC_NUM 72
+
 struct rx_sw_desc;
 
 struct sge_fl {                     /* SGE free-buffer queue state */
@@ -960,6 +967,8 @@ struct sge {
 	struct sge_eohw_txq *eohw_txq;
 	struct sge_ofld_rxq *eohw_rxq;
 
+	struct sge_eth_rxq *mirror_rxq[NCHAN];
+
 	u16 max_ethqsets;           /* # of available Ethernet queue sets */
 	u16 ethqsets;               /* # of active Ethernet queue sets */
 	u16 ethtxq_rover;           /* Tx queue to clean up next */

drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c

@@ -2742,6 +2742,58 @@ do { \
 	}
 
 	r -= eth_entries;
+	for_each_port(adap, j) {
+		struct port_info *pi = adap2pinfo(adap, j);
+		const struct sge_eth_rxq *rx;
+
+		mutex_lock(&pi->vi_mirror_mutex);
+		if (!pi->vi_mirror_count) {
+			mutex_unlock(&pi->vi_mirror_mutex);
+			continue;
+		}
+
+		if (r >= DIV_ROUND_UP(pi->nmirrorqsets, 4)) {
+			r -= DIV_ROUND_UP(pi->nmirrorqsets, 4);
+			mutex_unlock(&pi->vi_mirror_mutex);
+			continue;
+		}
+
+		rx = &s->mirror_rxq[j][r * 4];
+		n = min(4, pi->nmirrorqsets - 4 * r);
+
+		S("QType:", "Mirror-Rxq");
+		S("Interface:",
+		  rx[i].rspq.netdev ? rx[i].rspq.netdev->name : "N/A");
+		R("RspQ ID:", rspq.abs_id);
+		R("RspQ size:", rspq.size);
+		R("RspQE size:", rspq.iqe_len);
+		R("RspQ CIDX:", rspq.cidx);
+		R("RspQ Gen:", rspq.gen);
+		S3("u", "Intr delay:", qtimer_val(adap, &rx[i].rspq));
+		S3("u", "Intr pktcnt:", s->counter_val[rx[i].rspq.pktcnt_idx]);
+		R("FL ID:", fl.cntxt_id);
+		R("FL size:", fl.size - 8);
+		R("FL pend:", fl.pend_cred);
+		R("FL avail:", fl.avail);
+		R("FL PIDX:", fl.pidx);
+		R("FL CIDX:", fl.cidx);
+		RL("RxPackets:", stats.pkts);
+		RL("RxCSO:", stats.rx_cso);
+		RL("VLANxtract:", stats.vlan_ex);
+		RL("LROmerged:", stats.lro_merged);
+		RL("LROpackets:", stats.lro_pkts);
+		RL("RxDrops:", stats.rx_drops);
+		RL("RxBadPkts:", stats.bad_rx_pkts);
+		RL("FLAllocErr:", fl.alloc_failed);
+		RL("FLLrgAlcErr:", fl.large_alloc_failed);
+		RL("FLMapErr:", fl.mapping_err);
+		RL("FLLow:", fl.low);
+		RL("FLStarving:", fl.starving);
+
+		mutex_unlock(&pi->vi_mirror_mutex);
+		goto out;
+	}
+
 	if (!adap->tc_mqprio)
 		goto skip_mqprio;
 
@@ -3098,9 +3150,10 @@ do { \
 	return 0;
 }
 
-static int sge_queue_entries(const struct adapter *adap)
+static int sge_queue_entries(struct adapter *adap)
 {
 	int i, tot_uld_entries = 0, eohw_entries = 0, eosw_entries = 0;
+	int mirror_rxq_entries = 0;
 
 	if (adap->tc_mqprio) {
 		struct cxgb4_tc_port_mqprio *port_mqprio;
@@ -3123,6 +3176,15 @@ static int sge_queue_entries(const struct adapter *adap)
 		mutex_unlock(&adap->tc_mqprio->mqprio_mutex);
 	}
 
+	for_each_port(adap, i) {
+		struct port_info *pi = adap2pinfo(adap, i);
+
+		mutex_lock(&pi->vi_mirror_mutex);
+		if (pi->vi_mirror_count)
+			mirror_rxq_entries += DIV_ROUND_UP(pi->nmirrorqsets, 4);
+		mutex_unlock(&pi->vi_mirror_mutex);
+	}
+
 	if (!is_uld(adap))
 		goto lld_only;
 
@@ -3137,7 +3199,7 @@ static int sge_queue_entries(const struct adapter *adap)
 	mutex_unlock(&uld_mutex);
 
 lld_only:
-	return DIV_ROUND_UP(adap->sge.ethqsets, 4) +
+	return DIV_ROUND_UP(adap->sge.ethqsets, 4) + mirror_rxq_entries +
 	       eohw_entries + eosw_entries + tot_uld_entries +
 	       DIV_ROUND_UP(MAX_CTRL_QUEUES, 4) + 1;
 }