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igc: sysctl for TCP flag handling during TSO

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Add tso_tcp_flags_mask_first_segment, tso_tcp_flags_mask_middle_segment,
and tso_tcp_flags_mask_last_segment sysctl-variables to control the
handling of TCP flags during TSO.

This allows to change the masks appropriate for classical ECN and to
configure appropriate masks for accurate ECN.

MFC after:	3 days
Sponsored by:	Netflix
This commit is contained in:
Kevin Bowling 2024-11-20 19:38:01 -07:00
parent 90853dfac8
commit ab540d44ba
2 changed files with 61 additions and 0 deletions
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59
sys/dev/igc/if_igc.c
View File

@ -127,6 +127,7 @@ static void igc_print_debug_info(struct igc_softc *);
static int igc_is_valid_ether_addr(u8 *);
static void igc_neweitr(struct igc_softc *, struct igc_rx_queue *,
struct tx_ring *, struct rx_ring *);
static int igc_sysctl_tso_tcp_flags_mask(SYSCTL_HANDLER_ARGS);
/* Management and WOL Support */
static void igc_get_hw_control(struct igc_softc *);
static void igc_release_hw_control(struct igc_softc *);
@ -497,6 +498,27 @@ igc_if_attach_pre(if_ctx_t ctx)
CTLTYPE_INT | CTLFLAG_RW, sc, 0,
igc_sysctl_dmac, "I", "DMA Coalesce");
SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
OID_AUTO, "tso_tcp_flags_mask_first_segment",
CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
sc, 0, igc_sysctl_tso_tcp_flags_mask, "IU",
"TSO TCP flags mask for first segment");
SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
OID_AUTO, "tso_tcp_flags_mask_middle_segment",
CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
sc, 1, igc_sysctl_tso_tcp_flags_mask, "IU",
"TSO TCP flags mask for middle segment");
SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
OID_AUTO, "tso_tcp_flags_mask_last_segment",
CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
sc, 2, igc_sysctl_tso_tcp_flags_mask, "IU",
"TSO TCP flags mask for last segment");
/* Determine hardware and mac info */
igc_identify_hardware(ctx);
@ -3013,6 +3035,43 @@ igc_print_nvm_info(struct igc_softc *sc)
printf("\n");
}
static int
igc_sysctl_tso_tcp_flags_mask(SYSCTL_HANDLER_ARGS)
{
struct igc_softc *sc;
u32 reg, val, shift;
int error, mask;
sc = oidp->oid_arg1;
switch (oidp->oid_arg2) {
case 0:
reg = IGC_DTXTCPFLGL;
shift = 0;
break;
case 1:
reg = IGC_DTXTCPFLGL;
shift = 16;
break;
case 2:
reg = IGC_DTXTCPFLGH;
shift = 0;
break;
default:
return (EINVAL);
break;
}
val = IGC_READ_REG(&sc->hw, reg);
mask = (val >> shift) & 0xfff;
error = sysctl_handle_int(oidp, &mask, 0, req);
if (error != 0 || req->newptr == NULL)
return (error);
if (mask < 0 || mask > 0xfff)
return (EINVAL);
val = (val & ~(0xfff << shift)) | (mask << shift);
IGC_WRITE_REG(&sc->hw, reg, val);
return (0);
}
/*
* Set flow control using sysctl:
* Flow control values:

2
sys/dev/igc/igc_regs.h
View File

@ -145,6 +145,8 @@
#define IGC_FFVT_REG(_i) (0x09800 + ((_i) * 8))
#define IGC_FFLT_REG(_i) (0x05F00 + ((_i) * 8))
#define IGC_TXPBS 0x03404 /* Tx Packet Buffer Size - RW */
#define IGC_DTXTCPFLGL 0x0359C /* DMA Tx Control flag low - RW */
#define IGC_DTXTCPFLGH 0x035A0 /* DMA Tx Control flag high - RW */
/* Statistics Register Descriptions */
#define IGC_CRCERRS 0x04000 /* CRC Error Count - R/clr */
#define IGC_ALGNERRC 0x04004 /* Alignment Error Count - R/clr */