Merge branch 'ionic-next'

Shannon Nelson says:

====================
ionic Rx updates

The ionic driver's Rx path is due for an overhaul in order to
better use memory buffers and to clean up the data structures.

The first two patches convert the driver to using page sharing
between buffers so as to lessen the  page alloc and free overhead.

The remaining patches clean up the structs and fastpath code for
better efficency.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/ionic_dev.c

@@ -585,9 +585,9 @@ void ionic_q_sg_map(struct ionic_queue *q, void *base, dma_addr_t base_pa)
 void ionic_q_post(struct ionic_queue *q, bool ring_doorbell, ionic_desc_cb cb,
 		  void *cb_arg)
 {
-	struct device *dev = q->lif->ionic->dev;
 	struct ionic_desc_info *desc_info;
 	struct ionic_lif *lif = q->lif;
+	struct device *dev = q->dev;
 
 	desc_info = &q->info[q->head_idx];
 	desc_info->cb = cb;
@@ -629,7 +629,7 @@ void ionic_q_service(struct ionic_queue *q, struct ionic_cq_info *cq_info,
 
 	/* stop index must be for a descriptor that is not yet completed */
 	if (unlikely(!ionic_q_is_posted(q, stop_index)))
-		dev_err(q->lif->ionic->dev,
+		dev_err(q->dev,
 			"ionic stop is not posted %s stop %u tail %u head %u\n",
 			q->name, stop_index, q->tail_idx, q->head_idx);
 

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

@@ -170,9 +170,15 @@ typedef void (*ionic_desc_cb)(struct ionic_queue *q,
 			      struct ionic_desc_info *desc_info,
 			      struct ionic_cq_info *cq_info, void *cb_arg);
 
-struct ionic_page_info {
+#define IONIC_PAGE_SIZE				PAGE_SIZE
+#define IONIC_PAGE_SPLIT_SZ			(PAGE_SIZE / 2)
+#define IONIC_PAGE_GFP_MASK			(GFP_ATOMIC | __GFP_NOWARN |\
+						 __GFP_COMP | __GFP_MEMALLOC)
+
+struct ionic_buf_info {
 	struct page *page;
 	dma_addr_t dma_addr;
+	u32 page_offset;
 };
 
 struct ionic_desc_info {
@@ -187,8 +193,8 @@ struct ionic_desc_info {
 		struct ionic_txq_sg_desc *txq_sg_desc;
 		struct ionic_rxq_sg_desc *rxq_sgl_desc;
 	};
-	unsigned int npages;
-	struct ionic_page_info pages[IONIC_RX_MAX_SG_ELEMS + 1];
+	unsigned int nbufs;
+	struct ionic_buf_info bufs[IONIC_RX_MAX_SG_ELEMS + 1];
 	ionic_desc_cb cb;
 	void *cb_arg;
 };
@@ -199,10 +205,12 @@ struct ionic_queue {
 	struct device *dev;
 	struct ionic_lif *lif;
 	struct ionic_desc_info *info;
+	u64 dbval;
 	u16 head_idx;
 	u16 tail_idx;
 	unsigned int index;
 	unsigned int num_descs;
+	unsigned int max_sg_elems;
 	u64 dbell_count;
 	u64 stop;
 	u64 wake;
@@ -211,7 +219,6 @@ struct ionic_queue {
 	unsigned int type;
 	unsigned int hw_index;
 	unsigned int hw_type;
-	u64 dbval;
 	union {
 		void *base;
 		struct ionic_txq_desc *txq;
@@ -229,7 +236,7 @@ struct ionic_queue {
 	unsigned int sg_desc_size;
 	unsigned int pid;
 	char name[IONIC_QUEUE_NAME_MAX_SZ];
-};
+} ____cacheline_aligned_in_smp;
 
 #define IONIC_INTR_INDEX_NOT_ASSIGNED	-1
 #define IONIC_INTR_NAME_MAX_SZ		32
@@ -256,7 +263,7 @@ struct ionic_cq {
 	u64 compl_count;
 	void *base;
 	dma_addr_t base_pa;
-};
+} ____cacheline_aligned_in_smp;
 
 struct ionic;
 

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

@@ -495,6 +495,7 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
 		goto err_out;
 	}
 
+	new->q.dev = dev;
 	new->flags = flags;
 
 	new->q.info = devm_kcalloc(dev, num_descs, sizeof(*new->q.info),
@@ -506,6 +507,7 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
 	}
 
 	new->q.type = type;
+	new->q.max_sg_elems = lif->qtype_info[type].max_sg_elems;
 
 	err = ionic_q_init(lif, idev, &new->q, index, name, num_descs,
 			   desc_size, sg_desc_size, pid);
@@ -2202,6 +2204,9 @@ static void ionic_swap_queues(struct ionic_qcq *a, struct ionic_qcq *b)
 	swap(a->cq_base,      b->cq_base);
 	swap(a->cq_base_pa,   b->cq_base_pa);
 	swap(a->cq_size,      b->cq_size);
+
+	ionic_debugfs_del_qcq(a);
+	ionic_debugfs_add_qcq(a->q.lif, a);
 }
 
 int ionic_reconfigure_queues(struct ionic_lif *lif,
@@ -2450,7 +2455,6 @@ int ionic_lif_alloc(struct ionic *ionic)
 	lif->index = 0;
 	lif->ntxq_descs = IONIC_DEF_TXRX_DESC;
 	lif->nrxq_descs = IONIC_DEF_TXRX_DESC;
-	lif->tx_budget = IONIC_TX_BUDGET_DEFAULT;
 
 	/* Convert the default coalesce value to actual hw resolution */
 	lif->rx_coalesce_usecs = IONIC_ITR_COAL_USEC_DEFAULT;

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

@@ -159,16 +159,11 @@ struct ionic_qtype_info {
 
 #define IONIC_LIF_NAME_MAX_SZ		32
 struct ionic_lif {
-	char name[IONIC_LIF_NAME_MAX_SZ];
-	struct list_head list;
 	struct net_device *netdev;
 	DECLARE_BITMAP(state, IONIC_LIF_F_STATE_SIZE);
 	struct ionic *ionic;
-	bool registered;
 	unsigned int index;
 	unsigned int hw_index;
-	unsigned int kern_pid;
-	u64 __iomem *kern_dbpage;
 	struct mutex queue_lock;	/* lock for queue structures */
 	spinlock_t adminq_lock;		/* lock for AdminQ operations */
 	struct ionic_qcq *adminqcq;
@@ -177,20 +172,25 @@ struct ionic_lif {
 	struct ionic_tx_stats *txqstats;
 	struct ionic_qcq **rxqcqs;
 	struct ionic_rx_stats *rxqstats;
+	struct ionic_deferred deferred;
+	struct work_struct tx_timeout_work;
 	u64 last_eid;
+	unsigned int kern_pid;
+	u64 __iomem *kern_dbpage;
 	unsigned int neqs;
 	unsigned int nxqs;
 	unsigned int ntxq_descs;
 	unsigned int nrxq_descs;
 	u32 rx_copybreak;
-	u32 tx_budget;
 	unsigned int rx_mode;
 	u64 hw_features;
+	bool registered;
 	bool mc_overflow;
-	unsigned int nmcast;
 	bool uc_overflow;
 	u16 lif_type;
+	unsigned int nmcast;
 	unsigned int nucast;
+	char name[IONIC_LIF_NAME_MAX_SZ];
 
 	union ionic_lif_identity *identity;
 	struct ionic_lif_info *info;
@@ -205,16 +205,14 @@ struct ionic_lif {
 	u32 rss_ind_tbl_sz;
 
 	struct ionic_rx_filters rx_filters;
-	struct ionic_deferred deferred;
-	unsigned long *dbid_inuse;
-	unsigned int dbid_count;
-	struct dentry *dentry;
 	u32 rx_coalesce_usecs;		/* what the user asked for */
 	u32 rx_coalesce_hw;		/* what the hw is using */
 	u32 tx_coalesce_usecs;		/* what the user asked for */
 	u32 tx_coalesce_hw;		/* what the hw is using */
+	unsigned long *dbid_inuse;
+	unsigned int dbid_count;
 
-	struct work_struct tx_timeout_work;
+	struct dentry *dentry;
 };
 
 struct ionic_queue_params {

drivers/net/ethernet/pensando/ionic/ionic_main.c

@@ -234,17 +234,15 @@ static void ionic_adminq_cb(struct ionic_queue *q,
 {
 	struct ionic_admin_ctx *ctx = cb_arg;
 	struct ionic_admin_comp *comp;
-	struct device *dev;
 
 	if (!ctx)
 		return;
 
 	comp = cq_info->cq_desc;
-	dev = &q->lif->netdev->dev;
 
 	memcpy(&ctx->comp, comp, sizeof(*comp));
 
-	dev_dbg(dev, "comp admin queue command:\n");
+	dev_dbg(q->dev, "comp admin queue command:\n");
 	dynamic_hex_dump("comp ", DUMP_PREFIX_OFFSET, 16, 1,
 			 &ctx->comp, sizeof(ctx->comp), true);