nfp: make vNIC ctrl memory mapping function reusable

We will soon need to map control vNIC PCI memory as well as data vNIC
memory.  Make the function for mapping areas pointed to by an RTsym
reusable.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/nfp_net_main.c

@@ -248,40 +248,37 @@ nfp_net_pf_total_qcs(struct nfp_pf *pf, void __iomem *ctrl_bar,
 	return max_qc - min_qc;
 }
 
-static u8 __iomem *nfp_net_pf_map_ctrl_bar(struct nfp_pf *pf)
+static u8 __iomem *
+nfp_net_pf_map_rtsym(struct nfp_pf *pf, const char *name, const char *sym_fmt,
+		     unsigned int min_size, struct nfp_cpp_area **area)
 {
-	const struct nfp_rtsym *ctrl_sym;
-	u8 __iomem *ctrl_bar;
+	const struct nfp_rtsym *sym;
 	char pf_symbol[256];
+	u8 __iomem *mem;
 
-	snprintf(pf_symbol, sizeof(pf_symbol), "_pf%u_net_bar0",
+	snprintf(pf_symbol, sizeof(pf_symbol), sym_fmt,
 		 nfp_cppcore_pcie_unit(pf->cpp));
 
-	ctrl_sym = nfp_rtsym_lookup(pf->cpp, pf_symbol);
-	if (!ctrl_sym) {
-		dev_err(&pf->pdev->dev,
-			"Failed to find PF BAR0 symbol %s\n", pf_symbol);
-		return NULL;
+	sym = nfp_rtsym_lookup(pf->cpp, pf_symbol);
+	if (!sym) {
+		nfp_err(pf->cpp, "Failed to find PF symbol %s\n", pf_symbol);
+		return (u8 __iomem *)ERR_PTR(-ENOENT);
 	}
 
-	if (ctrl_sym->size < pf->max_data_vnics * NFP_PF_CSR_SLICE_SIZE) {
-		dev_err(&pf->pdev->dev,
-			"PF BAR0 too small to contain %d vNICs\n",
-			pf->max_data_vnics);
-		return NULL;
+	if (sym->size < min_size) {
+		nfp_err(pf->cpp, "PF symbol %s too small\n", pf_symbol);
+		return (u8 __iomem *)ERR_PTR(-EINVAL);
 	}
 
-	ctrl_bar = nfp_net_map_area(pf->cpp, "net.ctrl",
-				    ctrl_sym->domain, ctrl_sym->target,
-				    ctrl_sym->addr, ctrl_sym->size,
-				    &pf->data_vnic_bar);
-	if (IS_ERR(ctrl_bar)) {
-		dev_err(&pf->pdev->dev, "Failed to map PF BAR0: %ld\n",
-			PTR_ERR(ctrl_bar));
-		return NULL;
+	mem = nfp_net_map_area(pf->cpp, name, sym->domain, sym->target,
+			       sym->addr, sym->size, area);
+	if (IS_ERR(mem)) {
+		nfp_err(pf->cpp, "Failed to map PF symbol %s: %ld\n",
+			pf_symbol, PTR_ERR(mem));
+		return mem;
 	}
 
-	return ctrl_bar;
+	return mem;
 }
 
 static void nfp_net_pf_free_vnic(struct nfp_pf *pf, struct nfp_net *nn)
@@ -662,10 +659,10 @@ int nfp_net_refresh_eth_port(struct nfp_port *port)
  */
 int nfp_net_pci_probe(struct nfp_pf *pf)
 {
+	u32 ctrl_bar_sz, tx_area_sz, rx_area_sz;
 	u8 __iomem *ctrl_bar, *tx_bar, *rx_bar;
 	u32 total_tx_qcs, total_rx_qcs;
 	struct nfp_net_fw_version fw_ver;
-	u32 tx_area_sz, rx_area_sz;
 	u32 start_q;
 	int stride;
 	int err;
@@ -685,9 +682,13 @@ int nfp_net_pci_probe(struct nfp_pf *pf)
 		goto err_unlock;
 	}
 
-	ctrl_bar = nfp_net_pf_map_ctrl_bar(pf);
-	if (!ctrl_bar) {
-		err = pf->fw_loaded ? -EINVAL : -EPROBE_DEFER;
+	ctrl_bar_sz = pf->max_data_vnics * NFP_PF_CSR_SLICE_SIZE;
+	ctrl_bar = nfp_net_pf_map_rtsym(pf, "net.ctrl", "_pf%d_net_bar0",
+					ctrl_bar_sz, &pf->data_vnic_bar);
+	if (IS_ERR(ctrl_bar)) {
+		err = PTR_ERR(ctrl_bar);
+		if (!pf->fw_loaded && err == -ENOENT)
+			err = -EPROBE_DEFER;
 		goto err_unlock;
 	}