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

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Message-Id: <4267a91b40ef4dff755c4476757e2b17f48dbf57.1606802961.git.baruch@tkos.co.il>
Date:   Tue,  1 Dec 2020 08:09:21 +0200
From:   Baruch Siach <baruch@...s.co.il>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     netdev@...r.kernel.org, Baruch Siach <baruch@...s.co.il>
Subject: [PATCH ethtool] 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>
---
 ethtool.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ethtool.c b/ethtool.c
index 1d9067e774af..6d785f830ffa 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -4856,6 +4856,7 @@ static int do_getmodule(struct cmd_context *ctx)
 	err = send_ioctl(ctx, eeprom);
 	if (err < 0) {
 		perror("Cannot get Module EEPROM data");
+		fprintf(stderr, "SFP module not in cage?\n");
 		free(eeprom);
 		return 1;
 	}
-- 
2.29.2