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if_smsc: Add the ability to disable "turbo_mode", also called RX frame batching,

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similarly to the Linux driver, by a tunable read only sysctl.

Submitted by:	Oleg Sidorkin <osidorkin@gmail.com>
PR:		254884
MFC after:	1 week
Sponsored by:	Mellanox Technologies // NVIDIA Networking
This commit is contained in:
Hans Petter Selasky 2021-04-11 20:24:41 +02:00
parent afbb64f1d8
commit 5a3426f453
1 changed files with 15 additions and 4 deletions
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19
sys/dev/usb/net/if_smsc.c
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@ -119,11 +119,19 @@ __FBSDID("$FreeBSD$");
#include "miibus_if.h"
SYSCTL_NODE(_hw_usb, OID_AUTO, smsc, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"USB smsc");
static bool smsc_rx_packet_batching = 1;
SYSCTL_BOOL(_hw_usb_smsc, OID_AUTO, smsc_rx_packet_batching, CTLFLAG_RDTUN,
&smsc_rx_packet_batching, 0,
"If set, allows packet batching to increase throughput and latency. "
"Else throughput and latency is decreased.");
#ifdef USB_DEBUG
static int smsc_debug = 0;
SYSCTL_NODE(_hw_usb, OID_AUTO, smsc, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"USB smsc");
SYSCTL_INT(_hw_usb_smsc, OID_AUTO, debug, CTLFLAG_RWTUN, &smsc_debug, 0,
"Debug level");
#endif
@ -1377,7 +1385,9 @@ smsc_chip_init(struct smsc_softc *sc)
* Burst capability is the number of URBs that can be in a burst of data/
* ethernet frames.
*/
if (usbd_get_speed(sc->sc_ue.ue_udev) == USB_SPEED_HIGH)
if (!smsc_rx_packet_batching)
burst_cap = 0;
else if (usbd_get_speed(sc->sc_ue.ue_udev) == USB_SPEED_HIGH)
burst_cap = 37;
else
burst_cap = 128;
@ -1404,7 +1414,8 @@ smsc_chip_init(struct smsc_softc *sc)
/* The following setings are used for 'turbo mode', a.k.a multiple frames
* per Rx transaction (again info taken form Linux driver).
*/
reg_val |= (SMSC_HW_CFG_MEF | SMSC_HW_CFG_BCE);
if (smsc_rx_packet_batching)
reg_val |= (SMSC_HW_CFG_MEF | SMSC_HW_CFG_BCE);
smsc_write_reg(sc, SMSC_HW_CFG, reg_val);