summaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
authorJeff Kirsher <jeffrey.t.kirsher@intel.com>2015-04-03 13:27:13 -0700
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2015-04-14 15:56:22 -0700
commit78288e3750c568f0f95db235a06475db3b1a122a (patch)
tree9f9aaf8c51491fbca0a417de0cf1d9a176850590 /drivers
parent750c607e303971e1746f98bfeec17bf45cbf228d (diff)
fm10k: reset head instead of calling update_max_size
When we forcefully shutdown the mailbox, we then go about resetting max size to 0, and clearing all messages in the FIFO. Instead, we should just reset the head pointer so that the FIFO becomes empty, rather than changing the max size to 0. This helps prevent increment in tx_dropped counter during mailbox negotiation, which is confusing to viewers of Linux ethtool statistics output. Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Acked-by: Matthew Vick <matthew.vick@intel.com> Tested-by: Krishneil Singh <krishneil.k.singh@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/intel/fm10k/fm10k_mbx.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_mbx.c b/drivers/net/ethernet/intel/fm10k/fm10k_mbx.c
index e9ecfb422db2..27f82791e39a 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_mbx.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_mbx.c
@@ -126,6 +126,18 @@ static u16 fm10k_fifo_head_drop(struct fm10k_mbx_fifo *fifo)
}
/**
+ * fm10k_fifo_drop_all - Drop all messages in FIFO
+ * @fifo: pointer to FIFO
+ *
+ * This function resets the head pointer to drop all messages in the FIFO,
+ * and ensure the FIFO is empty.
+ **/
+static void fm10k_fifo_drop_all(struct fm10k_mbx_fifo *fifo)
+{
+ fifo->head = fifo->tail;
+}
+
+/**
* fm10k_mbx_index_len - Convert a head/tail index into a length value
* @mbx: pointer to mailbox
* @head: head index
@@ -1370,9 +1382,11 @@ static void fm10k_mbx_disconnect(struct fm10k_hw *hw,
timeout -= FM10K_MBX_POLL_DELAY;
} while ((timeout > 0) && (mbx->state != FM10K_STATE_CLOSED));
- /* in case we didn't close just force the mailbox into shutdown */
+ /* in case we didn't close, just force the mailbox into shutdown and
+ * drop all left over messages in the FIFO.
+ */
fm10k_mbx_connect_reset(mbx);
- fm10k_mbx_update_max_size(mbx, 0);
+ fm10k_fifo_drop_all(&mbx->tx);
fm10k_write_reg(hw, mbx->mbmem_reg, 0);
}