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ixgbe: 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 fix the masks appropriate for classical ECN and to
configure appropriate masks for accurate ECN.

Michael notes emperically 82599 has an unexpected middle mask:
Chip  First Middle Last
82599 0xFF6 0xFF6  0xF7F

which should be fixed up to 0xF76 (RFC 3168) in a future commit.

Reviewed by:	rrs, rscheff
MFC after:	3 days
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D44258
This commit is contained in:
Michael Tuexen 2024-11-20 18:18:17 -07:00 committed by Kevin Bowling
parent 3789810845
commit eea2e089f8
1 changed files with 56 additions and 0 deletions
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56
sys/dev/ixgbe/if_ix.c
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@ -204,6 +204,7 @@ static int ixgbe_sysctl_tdh_handler(SYSCTL_HANDLER_ARGS);
static int ixgbe_sysctl_eee_state(SYSCTL_HANDLER_ARGS);
static int ixgbe_sysctl_wol_enable(SYSCTL_HANDLER_ARGS);
static int ixgbe_sysctl_wufc(SYSCTL_HANDLER_ARGS);
static int ixgbe_sysctl_tso_tcp_flags_mask(SYSCTL_HANDLER_ARGS);
/* Deferred interrupt tasklets */
static void ixgbe_handle_msf(void *);
@ -2756,6 +2757,24 @@ ixgbe_add_device_sysctls(if_ctx_t ctx)
CTLTYPE_STRING | CTLFLAG_RD, sc, 0,
ixgbe_sysctl_print_fw_version, "A", "Prints FW/NVM Versions");
SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO,
"tso_tcp_flags_mask_first_segment",
CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
sc, 0, ixgbe_sysctl_tso_tcp_flags_mask, "IU",
"TSO TCP flags mask for first segment");
SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO,
"tso_tcp_flags_mask_middle_segment",
CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
sc, 1, ixgbe_sysctl_tso_tcp_flags_mask, "IU",
"TSO TCP flags mask for middle segment");
SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO,
"tso_tcp_flags_mask_last_segment",
CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
sc, 2, ixgbe_sysctl_tso_tcp_flags_mask, "IU",
"TSO TCP flags mask for last segment");
#ifdef IXGBE_DEBUG
/* testing sysctls (for all devices) */
SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO, "power_state",
@ -4742,6 +4761,43 @@ ixgbe_sysctl_eee_state(SYSCTL_HANDLER_ARGS)
return (error);
} /* ixgbe_sysctl_eee_state */
static int
ixgbe_sysctl_tso_tcp_flags_mask(SYSCTL_HANDLER_ARGS)
{
struct ixgbe_softc *sc;
u32 reg, val, shift;
int error, mask;
sc = oidp->oid_arg1;
switch (oidp->oid_arg2) {
case 0:
reg = IXGBE_DTXTCPFLGL;
shift = 0;
break;
case 1:
reg = IXGBE_DTXTCPFLGL;
shift = 16;
break;
case 2:
reg = IXGBE_DTXTCPFLGH;
shift = 0;
break;
default:
return (EINVAL);
break;
}
val = IXGBE_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);
IXGBE_WRITE_REG(&sc->hw, reg, val);
return (0);
}
/************************************************************************
* ixgbe_init_device_features
************************************************************************/