> -----Original Message-----
> From: dev <dev-boun...@dpdk.org> On Behalf Of chenmin....@intel.com
> Sent: Saturday, June 13, 2020 02:00
> To: Zhang, Qi Z <qi.z.zh...@intel.com>; Xing, Beilei <beilei.x...@intel.com>;
> Wu, Jingjing
> <jingjing...@intel.com>
> Cc: dev@dpdk.org; Sun, Chenmin <chenmin....@intel.com>
> Subject: [dpdk-dev] [PATCH] net/i40e: i40e FDIR update rate optimization
>
> From: Chenmin Sun <chenmin....@intel.com>
>
> This patch optimized the fdir update rate for i40e PF, by tracking the
> fdir rule will be inserted into guaranteed space or shared space.
> For the flows that are inserted to the guaranteed space, it returns success
> directly without retrieving the result for NIC.
>
> This patch changes the global register GLQF_CTL. Therefore, when devarg
> ``Support multiple driver`` is set, the patch will not take effect to
> avoid affecting the normal behavior of other i40e drivers, e.g., Linux
> kernel driver.
>
> Signed-off-by: Chenmin Sun <chenmin....@intel.com>
> ---
> drivers/net/i40e/i40e_ethdev.c | 96 ++++++++++++++++-
> drivers/net/i40e/i40e_ethdev.h | 57 +++++++---
> drivers/net/i40e/i40e_fdir.c | 182 +++++++++++++++++++++-----------
> drivers/net/i40e/i40e_flow.c | 181 +++++++++++++++++++++++++------
> drivers/net/i40e/i40e_rxtx.c | 15 ++-
> drivers/net/i40e/rte_pmd_i40e.c | 2 +-
> 6 files changed, 417 insertions(+), 116 deletions(-)
>
>
> +static
> +uint32_t bin_search(uint64_t data)
> +{
> + uint32_t pos = 0;
> +
> + if ((data & 0xFFFFFFFF) == 0) {
> + data >>= 32;
> + pos += 32;
> + }
> +
> + if ((data & 0xFFFF) == 0) {
> + data >>= 16;
> + pos += 16;
> + }
> + if ((data & 0xFF) == 0) {
> + data >>= 8;
> + pos += 8;
> + }
> + if ((data & 0xF) == 0) {
> + data >>= 4;
> + pos += 4;
> + }
> + if ((data & 0x3) == 0) {
> + data >>= 2;
> + pos += 2;
> + }
> + if ((data & 0x1) == 0)
> + pos += 1;
> +
> + return pos;
> +}
> +
Try " __builtin_ctzll ", DPDK has many examples to use it. ;-)
> --
> 2.17.1
