[PATCH net-next 1/7] nfp: refactor NSP initialization and add error message

[Jakub Kicinski]

When acquiring NSP communication resource fails user is left with
"probe failed with error -2" PCI code message but no info on what
caused the problem.  Some development boards may not have NSP FW
in the flash image.  Help users with a more verbouse message.

While at it move the whole NSP init to a separate function to keep
.probe() callback nice and simple.

Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_main.c | 59 ++++++++++++++++-----------
 1 file changed, 36 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.c 
b/drivers/net/ethernet/netronome/nfp/nfp_main.c
index db52b6a53c6f..ca2c464c15df 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_main.c
@@ -228,6 +228,40 @@ nfp_fw_load(struct pci_dev *pdev, struct nfp_pf *pf, 
struct nfp_nsp *nsp)
        return err < 0 ? err : 1;
 }
 
+static int nfp_nsp_init(struct pci_dev *pdev, struct nfp_pf *pf)
+{
+       struct nfp_nsp *nsp;
+       int err;
+
+       nsp = nfp_nsp_open(pf->cpp);
+       if (IS_ERR(nsp)) {
+               err = PTR_ERR(nsp);
+               dev_err(&pdev->dev, "Failed to access the NSP: %d\n", err);
+               return err;
+       }
+
+       err = nfp_nsp_wait(nsp);
+       if (err < 0)
+               goto exit_close_nsp;
+
+       pf->eth_tbl = __nfp_eth_read_ports(pf->cpp, nsp);
+
+       err = nfp_fw_load(pdev, pf, nsp);
+       if (err < 0) {
+               kfree(pf->eth_tbl);
+               dev_err(&pdev->dev, "Failed to load FW\n");
+               goto exit_close_nsp;
+       }
+
+       pf->fw_loaded = !!err;
+       err = 0;
+
+exit_close_nsp:
+       nfp_nsp_close(nsp);
+
+       return err;
+}
+
 static void nfp_fw_unload(struct nfp_pf *pf)
 {
        struct nfp_nsp *nsp;
@@ -251,7 +285,6 @@ static void nfp_fw_unload(struct nfp_pf *pf)
 static int nfp_pci_probe(struct pci_dev *pdev,
                         const struct pci_device_id *pci_id)
 {
-       struct nfp_nsp *nsp;
        struct nfp_pf *pf;
        int err;
 
@@ -289,28 +322,9 @@ static int nfp_pci_probe(struct pci_dev *pdev,
                goto err_disable_msix;
        }
 
-       nsp = nfp_nsp_open(pf->cpp);
-       if (IS_ERR(nsp)) {
-               err = PTR_ERR(nsp);
-               goto err_cpp_free;
-       }
-
-       err = nfp_nsp_wait(nsp);
-       if (err < 0) {
-               nfp_nsp_close(nsp);
+       err = nfp_nsp_init(pdev, pf);
+       if (err)
                goto err_cpp_free;
-       }
-
-       pf->eth_tbl = __nfp_eth_read_ports(pf->cpp, nsp);
-
-       err = nfp_fw_load(pdev, pf, nsp);
-       nfp_nsp_close(nsp);
-       if (err < 0) {
-               dev_err(&pdev->dev, "Failed to load FW\n");
-               goto err_eth_tbl_free;
-       }
-
-       pf->fw_loaded = !!err;
 
        err = nfp_net_pci_probe(pf);
        if (err)
@@ -321,7 +335,6 @@ static int nfp_pci_probe(struct pci_dev *pdev,
 err_fw_unload:
        if (pf->fw_loaded)
                nfp_fw_unload(pf);
-err_eth_tbl_free:
        kfree(pf->eth_tbl);
 err_cpp_free:
        nfp_cpp_free(pf->cpp);
-- 
2.11.0