bnxt_en: get rid of num_stat_ctxs variable

For bnxt_en driver, stat_ctxs created will always be same as
cp_nr_rings. Remove extra variable that duplicates the value.
Also introduce bnxt_get_avail_stat_ctxs_for_en() helper to get
available stat_ctxs and bnxt_get_ulp_stat_ctxs() helper to return
number of stat_ctxs used by RDMA.

Signed-off-by: Vasundhara Volam <[email protected]>
Signed-off-by: Michael Chan <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Vasundhara Volam

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -7081,6 +7081,15 @@ unsigned int bnxt_get_avail_cp_rings_for_en(struct bnxt *bp)
 		return cp - bp->cp_nr_rings;
 }
 
+unsigned int bnxt_get_avail_stat_ctxs_for_en(struct bnxt *bp)
+{
+	unsigned int stat;
+
+	stat = bnxt_get_max_func_stat_ctxs(bp) - bnxt_get_ulp_stat_ctxs(bp);
+	stat -= bp->cp_nr_rings;
+	return stat;
+}
+
 int bnxt_get_avail_msix(struct bnxt *bp, int num)
 {
 	int max_cp = bnxt_get_max_func_cp_rings(bp);
@@ -7242,7 +7251,6 @@ int bnxt_reserve_rings(struct bnxt *bp)
 		bp->tx_nr_rings_per_tc = bp->tx_nr_rings;
 		return -ENOMEM;
 	}
-	bp->num_stat_ctxs = bp->cp_nr_rings;
 	return 0;
 }
 
@@ -9309,7 +9317,6 @@ int bnxt_setup_mq_tc(struct net_device *dev, u8 tc)
 	bp->tx_nr_rings += bp->tx_nr_rings_xdp;
 	bp->cp_nr_rings = sh ? max_t(int, bp->tx_nr_rings, bp->rx_nr_rings) :
 			       bp->tx_nr_rings + bp->rx_nr_rings;
-	bp->num_stat_ctxs = bp->cp_nr_rings;
 
 	if (netif_running(bp->dev))
 		return bnxt_open_nic(bp, true, false);
@@ -9849,7 +9856,7 @@ static void _bnxt_get_max_rings(struct bnxt *bp, int *max_rx, int *max_tx,
 	*max_cp = bnxt_get_max_func_cp_rings_for_en(bp);
 	max_irq = min_t(int, bnxt_get_max_func_irqs(bp) -
 			bnxt_get_ulp_msix_num(bp),
-			bnxt_get_max_func_stat_ctxs(bp));
+			hw_resc->max_stat_ctxs - bnxt_get_ulp_stat_ctxs(bp));
 	if (!(bp->flags & BNXT_FLAG_CHIP_P5))
 		*max_cp = min_t(int, *max_cp, max_irq);
 	max_ring_grps = hw_resc->max_hw_ring_grps;
@@ -9980,7 +9987,6 @@ static int bnxt_set_dflt_rings(struct bnxt *bp, bool sh)
 			netdev_warn(bp->dev, "2nd rings reservation failed.\n");
 		bp->tx_nr_rings_per_tc = bp->tx_nr_rings;
 	}
-	bp->num_stat_ctxs = bp->cp_nr_rings;
 	if (BNXT_CHIP_TYPE_NITRO_A0(bp)) {
 		bp->rx_nr_rings++;
 		bp->cp_nr_rings++;

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1417,8 +1417,6 @@ struct bnxt {
 	int			cp_nr_pages;
 	int			cp_nr_rings;
 
-	int			num_stat_ctxs;
-
 	/* grp_info indexed by completion ring index */
 	struct bnxt_ring_grp_info	*grp_info;
 	struct bnxt_vnic_info	*vnic_info;
@@ -1690,6 +1688,7 @@ int __bnxt_hwrm_get_tx_rings(struct bnxt *bp, u16 fid, int *tx_rings);
 int bnxt_hwrm_set_coal(struct bnxt *);
 unsigned int bnxt_get_max_func_stat_ctxs(struct bnxt *bp);
 void bnxt_set_max_func_stat_ctxs(struct bnxt *bp, unsigned int max);
+unsigned int bnxt_get_avail_stat_ctxs_for_en(struct bnxt *bp);
 unsigned int bnxt_get_max_func_cp_rings(struct bnxt *bp);
 unsigned int bnxt_get_avail_cp_rings_for_en(struct bnxt *bp);
 int bnxt_get_avail_msix(struct bnxt *bp, int num);

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -663,8 +663,6 @@ static int bnxt_set_channels(struct net_device *dev,
 	bp->cp_nr_rings = sh ? max_t(int, bp->tx_nr_rings, bp->rx_nr_rings) :
 			       bp->tx_nr_rings + bp->rx_nr_rings;
 
-	bp->num_stat_ctxs = bp->cp_nr_rings;
-
 	/* After changing number of rx channels, update NTUPLE feature. */
 	netdev_update_features(dev);
 	if (netif_running(dev)) {

drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c

@@ -452,7 +452,7 @@ static int bnxt_hwrm_func_vf_resc_cfg(struct bnxt *bp, int num_vfs)
 	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_FUNC_VF_RESOURCE_CFG, -1, -1);
 
 	vf_cp_rings = bnxt_get_avail_cp_rings_for_en(bp);
-	vf_stat_ctx = hw_resc->max_stat_ctxs - bp->num_stat_ctxs;
+	vf_stat_ctx = bnxt_get_avail_stat_ctxs_for_en(bp);
 	if (bp->flags & BNXT_FLAG_AGG_RINGS)
 		vf_rx_rings = hw_resc->max_rx_rings - bp->rx_nr_rings * 2;
 	else
@@ -539,18 +539,16 @@ static int bnxt_hwrm_func_cfg(struct bnxt *bp, int num_vfs)
 	u32 rc = 0, mtu, i;
 	u16 vf_tx_rings, vf_rx_rings, vf_cp_rings, vf_stat_ctx, vf_vnics;
 	struct bnxt_hw_resc *hw_resc = &bp->hw_resc;
-	u16 vf_ring_grps, max_stat_ctxs;
 	struct hwrm_func_cfg_input req = {0};
 	struct bnxt_pf_info *pf = &bp->pf;
 	int total_vf_tx_rings = 0;
+	u16 vf_ring_grps;
 
 	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_FUNC_CFG, -1, -1);
 
-	max_stat_ctxs = hw_resc->max_stat_ctxs;
-
 	/* Remaining rings are distributed equally amongs VF's for now */
 	vf_cp_rings = bnxt_get_avail_cp_rings_for_en(bp) / num_vfs;
-	vf_stat_ctx = (max_stat_ctxs - bp->num_stat_ctxs) / num_vfs;
+	vf_stat_ctx = bnxt_get_avail_stat_ctxs_for_en(bp) / num_vfs;
 	if (bp->flags & BNXT_FLAG_AGG_RINGS)
 		vf_rx_rings = (hw_resc->max_rx_rings - bp->rx_nr_rings * 2) /
 			      num_vfs;
@@ -644,7 +642,7 @@ static int bnxt_sriov_enable(struct bnxt *bp, int *num_vfs)
 	vfs_supported = *num_vfs;
 
 	avail_cp = bnxt_get_avail_cp_rings_for_en(bp);
-	avail_stat = hw_resc->max_stat_ctxs - bp->num_stat_ctxs;
+	avail_stat = bnxt_get_avail_stat_ctxs_for_en(bp);
 	avail_cp = min_t(int, avail_cp, avail_stat);
 
 	while (vfs_supported) {

drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c

@@ -48,7 +48,7 @@ static int bnxt_register_dev(struct bnxt_en_dev *edev, int ulp_id,
 
 		max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp);
 		if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS ||
-		    bp->num_stat_ctxs == max_stat_ctxs)
+		    bp->cp_nr_rings == max_stat_ctxs)
 			return -ENOMEM;
 		bnxt_set_max_func_stat_ctxs(bp, max_stat_ctxs -
 					    BNXT_MIN_ROCE_STAT_CTXS);
@@ -218,6 +218,14 @@ int bnxt_get_ulp_msix_base(struct bnxt *bp)
 	return 0;
 }
 
+int bnxt_get_ulp_stat_ctxs(struct bnxt *bp)
+{
+	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP))
+		return BNXT_MIN_ROCE_STAT_CTXS;
+
+	return 0;
+}
+
 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id,
 			 struct bnxt_fw_msg *fw_msg)
 {

drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h

@@ -90,6 +90,7 @@ static inline bool bnxt_ulp_registered(struct bnxt_en_dev *edev, int ulp_id)
 
 int bnxt_get_ulp_msix_num(struct bnxt *bp);
 int bnxt_get_ulp_msix_base(struct bnxt *bp);
+int bnxt_get_ulp_stat_ctxs(struct bnxt *bp);
 void bnxt_ulp_stop(struct bnxt *bp);
 void bnxt_ulp_start(struct bnxt *bp);
 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs);

drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c

@@ -199,7 +199,6 @@ static int bnxt_xdp_set(struct bnxt *bp, struct bpf_prog *prog)
 	bp->tx_nr_rings_xdp = tx_xdp;
 	bp->tx_nr_rings = bp->tx_nr_rings_per_tc * tc + tx_xdp;
 	bp->cp_nr_rings = max_t(int, bp->tx_nr_rings, bp->rx_nr_rings);
-	bp->num_stat_ctxs = bp->cp_nr_rings;
 	bnxt_set_tpa_flags(bp);
 	bnxt_set_ring_params(bp);