Hi, Lijia Thanks for the patch? Are you using git send-email. The mail is html format, not friendly to discuss by mail thread.
About the change, just one comments: >+ uint32_t w; Could you move it above? Thanks From: Michael Lilja [mailto:m...@napatech.com] Sent: Wednesday, April 26, 2017 7:15 PM To: elin.zh...@intel.com; Wu, Jingjing <jingjing...@intel.com> Cc: dev@dpdk.org Subject: [PATCH] drivers/net/i40e/i40e_fdir.c: Improved i40e FDIR programming times During my work (https://www.napatech.com/hw-acceleration-via-rte_flow/)on a flowtable application example that use rte_flow I discovered that the rte_flow programming times on a i40e was +11ms. The patch below result in an average programming time of 22usec with a max of 60usec instead of +11ms. Could the following patch be useful? There might be a good reason for the original code, I'm unable to tell, so I will let it up to the maintainer to decide. Signed-off-by: Michael Lilja <m...@napatech.com> --- drivers/net/i40e/i40e_fdir.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/drivers/net/i40e/i40e_fdir.c b/drivers/net/i40e/i40e_fdir.c index 28cc554f5..a1ec66063 100644 --- a/drivers/net/i40e/i40e_fdir.c +++ b/drivers/net/i40e/i40e_fdir.c @@ -1296,23 +1296,29 @@ i40e_fdir_filter_programming(struct i40e_pf *pf, rte_wmb(); I40E_PCI_REG_WRITE(txq->qtx_tail, txq->tx_tail); - for (i = 0; i < I40E_FDIR_WAIT_COUNT; i++) { - rte_delay_us(I40E_FDIR_WAIT_INTERVAL_US); + for (i = 0; i < (I40E_FDIR_WAIT_COUNT * I40E_FDIR_WAIT_INTERVAL_US); i++) { if ((txdp->cmd_type_offset_bsz & rte_cpu_to_le_64(I40E_TXD_QW1_DTYPE_MASK)) == rte_cpu_to_le_64(I40E_TX_DESC_DTYPE_DESC_DONE)) break; + rte_delay_us(1); } - if (i >= I40E_FDIR_WAIT_COUNT) { + if (i >= (I40E_FDIR_WAIT_COUNT * I40E_FDIR_WAIT_INTERVAL_US)) { PMD_DRV_LOG(ERR, "Failed to program FDIR filter:" " time out to get DD on tx queue."); return -ETIMEDOUT; } /* totally delay 10 ms to check programming status*/ - rte_delay_us((I40E_FDIR_WAIT_COUNT - i) * I40E_FDIR_WAIT_INTERVAL_US); + uint32_t w; + for (w = 0; w < (I40E_FDIR_WAIT_COUNT * I40E_FDIR_WAIT_INTERVAL_US); w++) { + if (i40e_check_fdir_programming_status(rxq) >= 0) { + break; + } + rte_delay_us(1); + } if (i40e_check_fdir_programming_status(rxq) < 0) { PMD_DRV_LOG(ERR, "Failed to program FDIR filter:" - " programming status reported."); + " programming status reported."); return -ENOSYS; } -- Disclaimer: This email and any files transmitted with it may contain confidential information intended for the addressee(s) only. The information is not to be surrendered or copied to unauthorized persons. If you have received this communication in error, please notify the sender immediately and delete this e-mail from your system.
