netdev - [PATCH ethtool v2] Improve error message when SFP module is missing

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Date:   Wed,  2 Dec 2020 19:22:14 +0200
From:   Baruch Siach <baruch@...s.co.il>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Baruch Siach <baruch@...s.co.il>
Subject: [PATCH ethtool v2] Improve error message when SFP module is missing

ETHTOOL_GMODULEINFO request success indicates that SFP cage is present.
Failure of ETHTOOL_GMODULEEEPROM is most likely because SFP module is
not plugged in. Add an indication to the user as to what might be the
reason for the failure.

Signed-off-by: Baruch Siach <baruch@...s.co.il>
---
v2: Limit message to likely errno values (Andrew Lunn)
---
 ethtool.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ethtool.c b/ethtool.c
index 1d9067e774af..63b3a095eded 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -4855,7 +4855,11 @@ static int do_getmodule(struct cmd_context *ctx)
 	eeprom->offset = geeprom_offset;
 	err = send_ioctl(ctx, eeprom);
 	if (err < 0) {
+		int saved_errno = errno;
 		perror("Cannot get Module EEPROM data");
+		if (saved_errno == ENODEV || saved_errno == EIO ||
+				saved_errno == ENXIO)
+			fprintf(stderr, "SFP module not in cage?\n");
 		free(eeprom);
 		return 1;
 	}
-- 
2.29.2