6.6-stable review patch. If anyone has any objections, please let me know.
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From: Joshua Washington joshwash@google.com
commit 15970e1b23f5c25db88c613fddf9131de086f28e upstream.
When the tx tail is less than the head (in cases of wraparound), the TX consumed descriptor statistic in DQ will be reported as UINT32_MAX - head + tail, which is incorrect. Mask the difference of head and tail according to the ring size when reporting the statistic.
Cc: stable@vger.kernel.org Fixes: 2c9198356d56 ("gve: Add consumed counts to ethtool stats") Signed-off-by: Joshua Washington joshwash@google.com Signed-off-by: Harshitha Ramamurthy hramamurthy@google.com Reviewed-by: Michal Swiatkowski michal.swiatkowski@linux.intel.com Reviewed-by: Simon Horman horms@kernel.org Link: https://patch.msgid.link/20250402001037.2717315-1-hramamurthy@google.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/google/gve/gve_ethtool.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/google/gve/gve_ethtool.c +++ b/drivers/net/ethernet/google/gve/gve_ethtool.c @@ -356,7 +356,9 @@ gve_get_ethtool_stats(struct net_device */ data[i++] = 0; data[i++] = 0; - data[i++] = tx->dqo_tx.tail - tx->dqo_tx.head; + data[i++] = + (tx->dqo_tx.tail - tx->dqo_tx.head) & + tx->mask; } do { start =