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ice: change default number of receive descriptors

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The driver should start out with a reasonable number of descriptors that
can prevent drops due to a CPU being in a power management state.
Change the default number of descriptors to 2048.
The user can always change the value at runtime.  Transmit descriptor
counts are not modified because they don't need to change due to the
speed of the interface, or for power managed CPUs, but the code is
simplified to a fixed value for the transmit default.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jesse Brandeburg 2019-09-03 01:31:07 -07:00 committed by Jeff Kirsher
parent 8c243700ab
commit dd47e1fd86
1 changed files with 2 additions and 17 deletions
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19
drivers/net/ethernet/intel/ice/ice.h
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@ -47,23 +47,8 @@ extern const char ice_drv_ver[];
#define ICE_MIN_NUM_DESC 64
#define ICE_MAX_NUM_DESC 8160
#define ICE_DFLT_MIN_RX_DESC 512
/* if the default number of Rx descriptors between ICE_MAX_NUM_DESC and the
* number of descriptors to fill up an entire page is greater than or equal to
* ICE_DFLT_MIN_RX_DESC set it based on page size, otherwise set it to
* ICE_DFLT_MIN_RX_DESC
*/
#define ICE_DFLT_NUM_RX_DESC \
min_t(u16, ICE_MAX_NUM_DESC, \
max_t(u16, ALIGN(PAGE_SIZE / sizeof(union ice_32byte_rx_desc), \
ICE_REQ_DESC_MULTIPLE), \
ICE_DFLT_MIN_RX_DESC))
/* set default number of Tx descriptors to the minimum between ICE_MAX_NUM_DESC
* and the number of descriptors to fill up an entire page
*/
#define ICE_DFLT_NUM_TX_DESC min_t(u16, ICE_MAX_NUM_DESC, \
ALIGN(PAGE_SIZE / \
sizeof(struct ice_tx_desc), \
ICE_REQ_DESC_MULTIPLE))
#define ICE_DFLT_NUM_TX_DESC 256
#define ICE_DFLT_NUM_RX_DESC 2048
#define ICE_DFLT_TRAFFIC_CLASS BIT(0)
#define ICE_INT_NAME_STR_LEN (IFNAMSIZ + 16)