ionic: add handling of larger descriptors

In preparating for hardware timestamping, we need to support
large Tx and Rx completion descriptors.  Here we add the new
queue feature ids and handling for the completion descriptor
sizes.

We only are adding support for the Rx 2x sized completion
descriptors in the general Rx queues for now as we will be
using it for PTP Rx support, and we don't have an immediate
use for the large descriptors in the general Tx queues yet;
it will be used in a special Tx queues added in one of the
next few patches.
Signed-off-by: Allen Hubbe <allenbh@pensando.io>
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -354,12 +354,24 @@ enum ionic_logical_qtype {
  * @IONIC_QIDENT_F_SG:      Queue has scatter/gather ring
  * @IONIC_QIDENT_F_EQ:      Queue can use event queue
  * @IONIC_QIDENT_F_CMB:     Queue is in cmb bar
+ * @IONIC_Q_F_2X_DESC:      Double main descriptor size
+ * @IONIC_Q_F_2X_CQ_DESC:   Double cq descriptor size
+ * @IONIC_Q_F_2X_SG_DESC:   Double sg descriptor size
+ * @IONIC_Q_F_4X_DESC:      Quadruple main descriptor size
+ * @IONIC_Q_F_4X_CQ_DESC:   Quadruple cq descriptor size
+ * @IONIC_Q_F_4X_SG_DESC:   Quadruple sg descriptor size
  */
 enum ionic_q_feature {
 	IONIC_QIDENT_F_CQ		= BIT_ULL(0),
 	IONIC_QIDENT_F_SG		= BIT_ULL(1),
 	IONIC_QIDENT_F_EQ		= BIT_ULL(2),
 	IONIC_QIDENT_F_CMB		= BIT_ULL(3),
+	IONIC_Q_F_2X_DESC		= BIT_ULL(4),
+	IONIC_Q_F_2X_CQ_DESC		= BIT_ULL(5),
+	IONIC_Q_F_2X_SG_DESC		= BIT_ULL(6),
+	IONIC_Q_F_4X_DESC		= BIT_ULL(7),
+	IONIC_Q_F_4X_CQ_DESC		= BIT_ULL(8),
+	IONIC_Q_F_4X_SG_DESC		= BIT_ULL(9),
 };
 
 /**

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

@@ -1722,11 +1722,15 @@ static void ionic_txrx_free(struct ionic_lif *lif)
 
 static int ionic_txrx_alloc(struct ionic_lif *lif)
 {
-	unsigned int sg_desc_sz;
+	unsigned int num_desc, desc_sz, comp_sz, sg_desc_sz;
 	unsigned int flags;
 	unsigned int i;
 	int err = 0;
 
+	num_desc = lif->ntxq_descs;
+	desc_sz = sizeof(struct ionic_txq_desc);
+	comp_sz = sizeof(struct ionic_txq_comp);
+
 	if (lif->qtype_info[IONIC_QTYPE_TXQ].version >= 1 &&
 	    lif->qtype_info[IONIC_QTYPE_TXQ].sg_desc_sz ==
 					  sizeof(struct ionic_txq_sg_desc_v1))
@@ -1739,10 +1743,7 @@ static int ionic_txrx_alloc(struct ionic_lif *lif)
 		flags |= IONIC_QCQ_F_INTR;
 	for (i = 0; i < lif->nxqs; i++) {
 		err = ionic_qcq_alloc(lif, IONIC_QTYPE_TXQ, i, "tx", flags,
-				      lif->ntxq_descs,
-				      sizeof(struct ionic_txq_desc),
-				      sizeof(struct ionic_txq_comp),
-				      sg_desc_sz,
+				      num_desc, desc_sz, comp_sz, sg_desc_sz,
 				      lif->kern_pid, &lif->txqcqs[i]);
 		if (err)
 			goto err_out;
@@ -1759,16 +1760,24 @@ static int ionic_txrx_alloc(struct ionic_lif *lif)
 	}
 
 	flags = IONIC_QCQ_F_RX_STATS | IONIC_QCQ_F_SG | IONIC_QCQ_F_INTR;
+
+	num_desc = lif->nrxq_descs;
+	desc_sz = sizeof(struct ionic_rxq_desc);
+	comp_sz = sizeof(struct ionic_rxq_comp);
+	sg_desc_sz = sizeof(struct ionic_rxq_sg_desc);
+
+	if (lif->rxq_features & IONIC_Q_F_2X_CQ_DESC)
+		comp_sz *= 2;
+
 	for (i = 0; i < lif->nxqs; i++) {
 		err = ionic_qcq_alloc(lif, IONIC_QTYPE_RXQ, i, "rx", flags,
-				      lif->nrxq_descs,
-				      sizeof(struct ionic_rxq_desc),
-				      sizeof(struct ionic_rxq_comp),
-				      sizeof(struct ionic_rxq_sg_desc),
+				      num_desc, desc_sz, comp_sz, sg_desc_sz,
 				      lif->kern_pid, &lif->rxqcqs[i]);
 		if (err)
 			goto err_out;
 
+		lif->rxqcqs[i]->q.features = lif->rxq_features;
+
 		ionic_intr_coal_init(lif->ionic->idev.intr_ctrl,
 				     lif->rxqcqs[i]->intr.index,
 				     lif->rx_coalesce_hw);
@@ -2218,6 +2227,7 @@ static void ionic_swap_queues(struct ionic_qcq *a, struct ionic_qcq *b)
 	/* only swapping the queues, not the napi, flags, or other stuff */
 	swap(a->q.features,   b->q.features);
 	swap(a->q.num_descs,  b->q.num_descs);
+	swap(a->q.desc_size,  b->q.desc_size);
 	swap(a->q.base,       b->q.base);
 	swap(a->q.base_pa,    b->q.base_pa);
 	swap(a->q.info,       b->q.info);
@@ -2225,6 +2235,7 @@ static void ionic_swap_queues(struct ionic_qcq *a, struct ionic_qcq *b)
 	swap(a->q_base_pa,    b->q_base_pa);
 	swap(a->q_size,       b->q_size);
 
+	swap(a->q.sg_desc_size, b->q.sg_desc_size);
 	swap(a->q.sg_base,    b->q.sg_base);
 	swap(a->q.sg_base_pa, b->q.sg_base_pa);
 	swap(a->sg_base,      b->sg_base);
@@ -2232,6 +2243,7 @@ static void ionic_swap_queues(struct ionic_qcq *a, struct ionic_qcq *b)
 	swap(a->sg_size,      b->sg_size);
 
 	swap(a->cq.num_descs, b->cq.num_descs);
+	swap(a->cq.desc_size, b->cq.desc_size);
 	swap(a->cq.base,      b->cq.base);
 	swap(a->cq.base_pa,   b->cq.base_pa);
 	swap(a->cq.info,      b->cq.info);
@@ -2246,9 +2258,9 @@ static void ionic_swap_queues(struct ionic_qcq *a, struct ionic_qcq *b)
 int ionic_reconfigure_queues(struct ionic_lif *lif,
 			     struct ionic_queue_params *qparam)
 {
+	unsigned int num_desc, desc_sz, comp_sz, sg_desc_sz;
 	struct ionic_qcq **tx_qcqs = NULL;
 	struct ionic_qcq **rx_qcqs = NULL;
-	unsigned int sg_desc_sz;
 	unsigned int flags;
 	int err = -ENOMEM;
 	unsigned int i;
@@ -2260,7 +2272,9 @@ int ionic_reconfigure_queues(struct ionic_lif *lif,
 		if (!tx_qcqs)
 			goto err_out;
 	}
-	if (qparam->nxqs != lif->nxqs || qparam->nrxq_descs != lif->nrxq_descs) {
+	if (qparam->nxqs != lif->nxqs ||
+	    qparam->nrxq_descs != lif->nrxq_descs ||
+	    qparam->rxq_features != lif->rxq_features) {
 		rx_qcqs = devm_kcalloc(lif->ionic->dev, lif->ionic->nrxqs_per_lif,
 				       sizeof(struct ionic_qcq *), GFP_KERNEL);
 		if (!rx_qcqs)
@@ -2270,21 +2284,22 @@ int ionic_reconfigure_queues(struct ionic_lif *lif,
 	/* allocate new desc_info and rings, but leave the interrupt setup
 	 * until later so as to not mess with the still-running queues
 	 */
-	if (lif->qtype_info[IONIC_QTYPE_TXQ].version >= 1 &&
-	    lif->qtype_info[IONIC_QTYPE_TXQ].sg_desc_sz ==
-					  sizeof(struct ionic_txq_sg_desc_v1))
-		sg_desc_sz = sizeof(struct ionic_txq_sg_desc_v1);
-	else
-		sg_desc_sz = sizeof(struct ionic_txq_sg_desc);
-
 	if (tx_qcqs) {
+		num_desc = qparam->ntxq_descs;
+		desc_sz = sizeof(struct ionic_txq_desc);
+		comp_sz = sizeof(struct ionic_txq_comp);
+
+		if (lif->qtype_info[IONIC_QTYPE_TXQ].version >= 1 &&
+		    lif->qtype_info[IONIC_QTYPE_TXQ].sg_desc_sz ==
+		    sizeof(struct ionic_txq_sg_desc_v1))
+			sg_desc_sz = sizeof(struct ionic_txq_sg_desc_v1);
+		else
+			sg_desc_sz = sizeof(struct ionic_txq_sg_desc);
+
 		for (i = 0; i < qparam->nxqs; i++) {
 			flags = lif->txqcqs[i]->flags & ~IONIC_QCQ_F_INTR;
 			err = ionic_qcq_alloc(lif, IONIC_QTYPE_TXQ, i, "tx", flags,
-					      qparam->ntxq_descs,
-					      sizeof(struct ionic_txq_desc),
-					      sizeof(struct ionic_txq_comp),
-					      sg_desc_sz,
+					      num_desc, desc_sz, comp_sz, sg_desc_sz,
 					      lif->kern_pid, &tx_qcqs[i]);
 			if (err)
 				goto err_out;
@@ -2292,16 +2307,23 @@ int ionic_reconfigure_queues(struct ionic_lif *lif,
 	}
 
 	if (rx_qcqs) {
+		num_desc = qparam->nrxq_descs;
+		desc_sz = sizeof(struct ionic_rxq_desc);
+		comp_sz = sizeof(struct ionic_rxq_comp);
+		sg_desc_sz = sizeof(struct ionic_rxq_sg_desc);
+
+		if (qparam->rxq_features & IONIC_Q_F_2X_CQ_DESC)
+			comp_sz *= 2;
+
 		for (i = 0; i < qparam->nxqs; i++) {
 			flags = lif->rxqcqs[i]->flags & ~IONIC_QCQ_F_INTR;
 			err = ionic_qcq_alloc(lif, IONIC_QTYPE_RXQ, i, "rx", flags,
-					      qparam->nrxq_descs,
-					      sizeof(struct ionic_rxq_desc),
-					      sizeof(struct ionic_rxq_comp),
-					      sizeof(struct ionic_rxq_sg_desc),
+					      num_desc, desc_sz, comp_sz, sg_desc_sz,
 					      lif->kern_pid, &rx_qcqs[i]);
 			if (err)
 				goto err_out;
+
+			rx_qcqs[i]->q.features = qparam->rxq_features;
 		}
 	}
 
@@ -2388,6 +2410,7 @@ int ionic_reconfigure_queues(struct ionic_lif *lif,
 	}
 
 	swap(lif->nxqs, qparam->nxqs);
+	swap(lif->rxq_features, qparam->rxq_features);
 
 err_out_reinit_unlock:
 	/* re-init the queues, but don't lose an error code */

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

@@ -183,6 +183,7 @@ struct ionic_lif {
 	unsigned int ntxq_descs;
 	unsigned int nrxq_descs;
 	u32 rx_copybreak;
+	u64 rxq_features;
 	unsigned int rx_mode;
 	u64 hw_features;
 	bool registered;
@@ -221,6 +222,7 @@ struct ionic_queue_params {
 	unsigned int ntxq_descs;
 	unsigned int nrxq_descs;
 	unsigned int intr_split;
+	u64 rxq_features;
 };
 
 static inline void ionic_init_queue_params(struct ionic_lif *lif,
@@ -230,6 +232,7 @@ static inline void ionic_init_queue_params(struct ionic_lif *lif,
 	qparam->ntxq_descs = lif->ntxq_descs;
 	qparam->nrxq_descs = lif->nrxq_descs;
 	qparam->intr_split = test_bit(IONIC_LIF_F_SPLIT_INTR, lif->state);
+	qparam->rxq_features = lif->rxq_features;
 }
 
 static inline u32 ionic_coal_usec_to_hw(struct ionic *ionic, u32 usecs)

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

@@ -229,12 +229,14 @@ static void ionic_rx_clean(struct ionic_queue *q,
 			   struct ionic_cq_info *cq_info,
 			   void *cb_arg)
 {
-	struct ionic_rxq_comp *comp = cq_info->rxcq;
 	struct net_device *netdev = q->lif->netdev;
 	struct ionic_qcq *qcq = q_to_qcq(q);
 	struct ionic_rx_stats *stats;
+	struct ionic_rxq_comp *comp;
 	struct sk_buff *skb;
 
+	comp = cq_info->cq_desc + qcq->cq.desc_size - sizeof(*comp);
+
 	stats = q_to_rx_stats(q);
 
 	if (comp->status) {
@@ -304,9 +306,11 @@ static void ionic_rx_clean(struct ionic_queue *q,
 
 static bool ionic_rx_service(struct ionic_cq *cq, struct ionic_cq_info *cq_info)
 {
-	struct ionic_rxq_comp *comp = cq_info->rxcq;
 	struct ionic_queue *q = cq->bound_q;
 	struct ionic_desc_info *desc_info;
+	struct ionic_rxq_comp *comp;
+
+	comp = cq_info->cq_desc + cq->desc_size - sizeof(*comp);
 
 	if (!color_match(comp->pkt_type_color, cq->done_color))
 		return false;
@@ -693,13 +697,15 @@ static void ionic_tx_clean(struct ionic_queue *q,
 
 static bool ionic_tx_service(struct ionic_cq *cq, struct ionic_cq_info *cq_info)
 {
-	struct ionic_txq_comp *comp = cq_info->txcq;
 	struct ionic_queue *q = cq->bound_q;
 	struct ionic_desc_info *desc_info;
+	struct ionic_txq_comp *comp;
 	int bytes = 0;
 	int pkts = 0;
 	u16 index;
 
+	comp = cq_info->cq_desc + cq->desc_size - sizeof(*comp);
+
 	if (!color_match(comp->color, cq->done_color))
 		return false;