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From ad9e296622adf2cd775c93a94c4ba2756d07e0d5 Mon Sep 17 00:00:00 2001
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From: Maxim Mikityanskiy <maximmi@mellanox.com>
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Date: Tue, 25 Aug 2020 11:11:38 +0300
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Subject: [PATCH 02/17] netlink: Print and return an error when features
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weren't changed
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The legacy ethtool prints an error message and returns 1 if no features
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were changed as requested. Port this behavior to ethtool-netlink.
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req_mask is compared to wanted_mask to detect if any feature was
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changed. If these masks are equal, it means that the kernel hasn't
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changed anything, and all bits got to wanted.
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Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
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Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
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(cherry picked from commit e06cf83352d5161399da49eae7296126cd5e4ea1)
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---
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netlink/features.c | 11 ++++++++++-
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1 file changed, 10 insertions(+), 1 deletion(-)
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diff --git a/netlink/features.c b/netlink/features.c
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index 133529da2b9f..762259405acc 100644
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--- a/netlink/features.c
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+++ b/netlink/features.c
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@@ -243,6 +243,7 @@ int nl_gfeatures(struct cmd_context *ctx)
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/* FEATURES_SET */
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struct sfeatures_context {
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+ bool nothing_changed;
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uint32_t req_mask[0];
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};
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@@ -411,10 +412,14 @@ static void show_feature_changes(struct nl_context *nlctx,
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if (!wanted_val || !wanted_mask || !active_val || !active_mask)
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goto err;
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+ sfctx->nothing_changed = true;
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diff = false;
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- for (i = 0; i < words; i++)
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+ for (i = 0; i < words; i++) {
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+ if (wanted_mask[i] != sfctx->req_mask[i])
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+ sfctx->nothing_changed = false;
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if (wanted_mask[i] || (active_mask[i] & ~sfctx->req_mask[i]))
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diff = true;
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+ }
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if (!diff)
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return;
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@@ -520,6 +525,10 @@ int nl_sfeatures(struct cmd_context *ctx)
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if (ret < 0)
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return 92;
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ret = nlsock_process_reply(nlsk, sfeatures_reply_cb, nlctx);
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+ if (sfctx->nothing_changed) {
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+ fprintf(stderr, "Could not change any device features\n");
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+ return nlctx->exit_code ?: 1;
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+ }
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if (ret == 0)
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return 0;
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return nlctx->exit_code ?: 92;
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--
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2.26.2
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