ionic: Add Tx and Rx handling

Add both the Tx and Rx queue setup and handling.  The related
stats display comes later.  Instead of using the generic napi
routines used by the slow-path commands, the Tx and Rx paths
are simplified and inlined in one file in order to get better
compiler optimizations.
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/Makefile

@@ -4,4 +4,5 @@
 obj-$(CONFIG_IONIC) := ionic.o
 
 ionic-y := ionic_main.o ionic_bus_pci.o ionic_devlink.o ionic_dev.o \
-	   ionic_debugfs.o ionic_lif.o ionic_rx_filter.o ionic_ethtool.o
+	   ionic_debugfs.o ionic_lif.o ionic_rx_filter.o ionic_ethtool.o \
+	   ionic_txrx.o

drivers/net/ethernet/pensando/ionic/ionic_lif.h

@@ -12,20 +12,38 @@
 
 #define IONIC_MAX_NUM_NAPI_CNTR		(NAPI_POLL_WEIGHT + 1)
 #define IONIC_MAX_NUM_SG_CNTR		(IONIC_TX_MAX_SG_ELEMS + 1)
+#define IONIC_RX_COPYBREAK_DEFAULT		256
 
 struct ionic_tx_stats {
+	u64 dma_map_err;
 	u64 pkts;
 	u64 bytes;
+	u64 clean;
+	u64 linearize;
+	u64 no_csum;
+	u64 csum;
+	u64 crc32_csum;
+	u64 tso;
+	u64 frags;
+	u64 sg_cntr[IONIC_MAX_NUM_SG_CNTR];
 };
 
 struct ionic_rx_stats {
+	u64 dma_map_err;
+	u64 alloc_err;
 	u64 pkts;
 	u64 bytes;
+	u64 csum_none;
+	u64 csum_complete;
+	u64 csum_error;
+	u64 buffers_posted;
 };
 
 #define IONIC_QCQ_F_INITED		BIT(0)
 #define IONIC_QCQ_F_SG			BIT(1)
 #define IONIC_QCQ_F_INTR		BIT(2)
+#define IONIC_QCQ_F_TX_STATS		BIT(3)
+#define IONIC_QCQ_F_RX_STATS		BIT(4)
 #define IONIC_QCQ_F_NOTIFYQ		BIT(5)
 
 struct ionic_napi_stats {
@@ -54,7 +72,14 @@ struct ionic_qcq {
 	struct dentry *dentry;
 };
 
+struct ionic_qcqst {
+	struct ionic_qcq *qcq;
+	struct ionic_q_stats *stats;
+};
+
 #define q_to_qcq(q)		container_of(q, struct ionic_qcq, q)
+#define q_to_tx_stats(q)	(&q_to_qcq(q)->stats->tx)
+#define q_to_rx_stats(q)	(&q_to_qcq(q)->stats->rx)
 #define napi_to_qcq(napi)	container_of(napi, struct ionic_qcq, napi)
 #define napi_to_cq(napi)	(&napi_to_qcq(napi)->cq)
 
@@ -106,11 +131,14 @@ struct ionic_lif {
 	spinlock_t adminq_lock;		/* lock for AdminQ operations */
 	struct ionic_qcq *adminqcq;
 	struct ionic_qcq *notifyqcq;
+	struct ionic_qcqst *txqcqs;
+	struct ionic_qcqst *rxqcqs;
 	u64 last_eid;
 	unsigned int neqs;
 	unsigned int nxqs;
 	unsigned int ntxq_descs;
 	unsigned int nrxq_descs;
+	u32 rx_copybreak;
 	unsigned int rx_mode;
 	u64 hw_features;
 	bool mc_overflow;
@@ -131,6 +159,11 @@ struct ionic_lif {
 	u32 flags;
 };
 
+#define lif_to_txqcq(lif, i)	((lif)->txqcqs[i].qcq)
+#define lif_to_rxqcq(lif, i)	((lif)->rxqcqs[i].qcq)
+#define lif_to_txq(lif, i)	(&lif_to_txqcq((lif), i)->q)
+#define lif_to_rxq(lif, i)	(&lif_to_txqcq((lif), i)->q)
+
 static inline int ionic_wait_for_bit(struct ionic_lif *lif, int bitname)
 {
 	unsigned long tlimit = jiffies + HZ;
@@ -156,6 +189,20 @@ int ionic_open(struct net_device *netdev);
 int ionic_stop(struct net_device *netdev);
 int ionic_reset_queues(struct ionic_lif *lif);
 
+static inline void debug_stats_txq_post(struct ionic_qcq *qcq,
+					struct ionic_txq_desc *desc, bool dbell)
+{
+	u8 num_sg_elems = ((le64_to_cpu(desc->cmd) >> IONIC_TXQ_DESC_NSGE_SHIFT)
+						& IONIC_TXQ_DESC_NSGE_MASK);
+
+	qcq->q.dbell_count += dbell;
+
+	if (num_sg_elems > (IONIC_MAX_NUM_SG_CNTR - 1))
+		num_sg_elems = IONIC_MAX_NUM_SG_CNTR - 1;
+
+	qcq->stats->tx.sg_cntr[num_sg_elems]++;
+}
+
 static inline void debug_stats_napi_poll(struct ionic_qcq *qcq,
 					 unsigned int work_done)
 {
@@ -168,7 +215,10 @@ static inline void debug_stats_napi_poll(struct ionic_qcq *qcq,
 }
 
 #define DEBUG_STATS_CQE_CNT(cq)		((cq)->compl_count++)
+#define DEBUG_STATS_RX_BUFF_CNT(qcq)	((qcq)->stats->rx.buffers_posted++)
 #define DEBUG_STATS_INTR_REARM(intr)	((intr)->rearm_count++)
+#define DEBUG_STATS_TXQ_POST(qcq, txdesc, dbell) \
+	debug_stats_txq_post(qcq, txdesc, dbell)
 #define DEBUG_STATS_NAPI_POLL(qcq, work_done) \
 	debug_stats_napi_poll(qcq, work_done)
 

drivers/net/ethernet/pensando/ionic/ionic_txrx.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
+
+#ifndef _IONIC_TXRX_H_
+#define _IONIC_TXRX_H_
+
+void ionic_rx_flush(struct ionic_cq *cq);
+void ionic_tx_flush(struct ionic_cq *cq);
+
+void ionic_rx_fill(struct ionic_queue *q);
+void ionic_rx_empty(struct ionic_queue *q);
+int ionic_rx_napi(struct napi_struct *napi, int budget);
+netdev_tx_t ionic_start_xmit(struct sk_buff *skb, struct net_device *netdev);
+
+#endif /* _IONIC_TXRX_H_ */