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Code Issues Releases Activity

e1000: 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.

Reviewed by:	rrs
MFC after:	3 days
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D44259
This commit is contained in:
Michael Tuexen 2024-11-20 19:22:10 -07:00 committed by Kevin Bowling
parent d99eb8230e
commit 90853dfac8
1 changed files with 56 additions and 0 deletions
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56
sys/dev/e1000/if_em.c
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@ -333,6 +333,7 @@ static int em_is_valid_ether_addr(u8 *);
static void em_newitr(struct e1000_softc *, struct em_rx_queue *,
struct tx_ring *, struct rx_ring *);
static bool em_automask_tso(if_ctx_t);
static int em_sysctl_tso_tcp_flags_mask(SYSCTL_HANDLER_ARGS);
static int em_sysctl_int_delay(SYSCTL_HANDLER_ARGS);
static void em_add_int_delay_sysctl(struct e1000_softc *, const char *,
const char *, struct em_int_delay_info *, int, int);
@ -876,6 +877,24 @@ em_if_attach_pre(if_ctx_t ctx)
igb_sysctl_dmac, "I", "DMA Coalesce");
}
SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO,
"tso_tcp_flags_mask_first_segment",
CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
sc, 0, em_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, em_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, em_sysctl_tso_tcp_flags_mask, "IU",
"TSO TCP flags mask for last segment");
scctx->isc_tx_nsegments = EM_MAX_SCATTER;
scctx->isc_nrxqsets_max = scctx->isc_ntxqsets_max = em_set_num_queues(ctx);
if (bootverbose)
@ -5182,6 +5201,43 @@ em_sysctl_int_delay(SYSCTL_HANDLER_ARGS)
return (0);
}
static int
em_sysctl_tso_tcp_flags_mask(SYSCTL_HANDLER_ARGS)
{
struct e1000_softc *sc;
u32 reg, val, shift;
int error, mask;
sc = oidp->oid_arg1;
switch (oidp->oid_arg2) {
case 0:
reg = E1000_DTXTCPFLGL;
shift = 0;
break;
case 1:
reg = E1000_DTXTCPFLGL;
shift = 16;
break;
case 2:
reg = E1000_DTXTCPFLGH;
shift = 0;
break;
default:
return (EINVAL);
break;
}
val = E1000_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);
E1000_WRITE_REG(&sc->hw, reg, val);
return (0);
}
static void
em_add_int_delay_sysctl(struct e1000_softc *sc, const char *name,
const char *description, struct em_int_delay_info *info,