6.12-stable review patch. If anyone has any objections, please let me know.
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From: Alexander Duyck alexanderduyck@fb.com
[ Upstream commit ab064f6005973d456f95ae99cd9ea0d8ab676cce ]
There were a couple different issues found in fbnic_mbx_poll_tx_ready. Among them were the fact that we were sleeping much longer than we actually needed to as the actual FW could respond in under 20ms. The other issue was that we would just keep polling the mailbox even if the device itself had gone away.
To address the responsiveness issues we can decrease the sleeps to 20ms and use a jiffies based timeout value rather than just counting the number of times we slept and then polled.
To address the hardware going away we can move the check for the firmware BAR being present from where it was and place it inside the loop after the mailbox descriptor ring is initialized and before we sleep so that we just abort and return an error if the device went away during initialization.
With these two changes we see a significant improvement in boot times for the driver.
Fixes: da3cde08209e ("eth: fbnic: Add FW communication mechanism") Signed-off-by: Alexander Duyck alexanderduyck@fb.com Reviewed-by: Jacob Keller jacob.e.keller@intel.com Link: https://patch.msgid.link/174654721224.499179.2698616208976624755.stgit@ahduy... Reviewed-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/meta/fbnic/fbnic_fw.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_fw.c b/drivers/net/ethernet/meta/fbnic/fbnic_fw.c index dd30f0cb02506..8d6af5c3a49c0 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic_fw.c +++ b/drivers/net/ethernet/meta/fbnic/fbnic_fw.c @@ -772,27 +772,30 @@ void fbnic_mbx_poll(struct fbnic_dev *fbd)
int fbnic_mbx_poll_tx_ready(struct fbnic_dev *fbd) { + unsigned long timeout = jiffies + 10 * HZ + 1; struct fbnic_fw_mbx *tx_mbx; - int attempts = 50; - - /* Immediate fail if BAR4 isn't there */ - if (!fbnic_fw_present(fbd)) - return -ENODEV;
tx_mbx = &fbd->mbx[FBNIC_IPC_MBX_TX_IDX]; - while (!tx_mbx->ready && --attempts) { + while (!tx_mbx->ready) { + if (!time_is_after_jiffies(timeout)) + return -ETIMEDOUT; + /* Force the firmware to trigger an interrupt response to * avoid the mailbox getting stuck closed if the interrupt * is reset. */ fbnic_mbx_reset_desc_ring(fbd, FBNIC_IPC_MBX_TX_IDX);
- msleep(200); + /* Immediate fail if BAR4 went away */ + if (!fbnic_fw_present(fbd)) + return -ENODEV; + + msleep(20);
fbnic_mbx_poll(fbd); }
- return attempts ? 0 : -ETIMEDOUT; + return 0; }
void fbnic_mbx_flush_tx(struct fbnic_dev *fbd)