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Index: share/man/man4/iflib.4
===================================================================
--- share/man/man4/iflib.4
+++ share/man/man4/iflib.4
@@ -55,6 +55,14 @@
socket connected to the controller.
.It Va disable_msix
Disables MSI-X interrupts for the device.
+.It Va core_offset
+Specifies a starting core offset to assign queues to. If the value is
+unspecified or 65535, cores are assigned sequentially across controllers.
+.It Va separate_txrx
+Requests that RX and TX queues not be paired on the same core. If this
+is zero or not set, an RX and TX queue pair will be assigned to each core.
+When set to a non-zero value, TX queues are assigned to cores following the
+last RX queue.
.El
.Pp
These
Index: sys/net/iflib.c
===================================================================
--- sys/net/iflib.c
+++ sys/net/iflib.c
@@ -188,6 +188,9 @@
uint16_t ifc_sysctl_qs_eq_override;
uint16_t ifc_sysctl_rx_budget;
uint16_t ifc_sysctl_tx_abdicate;
+ uint16_t ifc_sysctl_core_offset;
+#define CORE_OFFSET_UNSPECIFIED 0xffff
+ uint8_t ifc_sysctl_separate_txrx;
qidx_t ifc_sysctl_ntxds[8];
qidx_t ifc_sysctl_nrxds[8];
@@ -725,6 +728,17 @@
static struct mbuf * iflib_fixup_rx(struct mbuf *m);
#endif
+static SLIST_HEAD(cpu_offset_list, cpu_offset) cpu_offsets =
+ SLIST_HEAD_INITIALIZER(cpu_offsets);
+struct cpu_offset {
+ SLIST_ENTRY(cpu_offset) entries;
+ cpuset_t set;
+ uint16_t offset;
+};
+static struct mtx cpu_offset_mtx;
+MTX_SYSINIT(iflib_cpu_offset, &cpu_offset_mtx, "iflib_cpu_offset lock",
+ MTX_DEF);
+
NETDUMP_DEFINE(iflib);
#ifdef DEV_NETMAP
@@ -4366,6 +4380,49 @@
}
}
+static uint16_t
+get_ctx_core_offset(if_ctx_t ctx)
+{
+ if_softc_ctx_t scctx = &ctx->ifc_softc_ctx;
+ struct cpu_offset *op;
+ uint16_t qc;
+ uint16_t ret = ctx->ifc_sysctl_core_offset;
+
+ if (ret != CORE_OFFSET_UNSPECIFIED)
+ return (ret);
+
+ if (ctx->ifc_sysctl_separate_txrx)
+ qc = scctx->isc_ntxqsets + scctx->isc_nrxqsets;
+ else
+ qc = max(scctx->isc_ntxqsets, scctx->isc_nrxqsets);
+
+ mtx_lock(&cpu_offset_mtx);
+ SLIST_FOREACH(op, &cpu_offsets, entries) {
+ if (CPU_CMP(&ctx->ifc_cpus, &op->set) == 0) {
+ ret = op->offset;
+ op->offset += qc;
+ break;
+ }
+ }
+ if (ret == CORE_OFFSET_UNSPECIFIED) {
+ ret = 0;
+ op = malloc(sizeof(struct cpu_offset), M_IFLIB,
+ M_NOWAIT | M_ZERO);
+ if (op == NULL) {
+ device_printf(ctx->ifc_dev,
+ "allocation for cpu offset failed.\n");
+ }
+ else {
+ op->offset = qc;
+ CPU_COPY(&ctx->ifc_cpus, &op->set);
+ SLIST_INSERT_HEAD(&cpu_offsets, op, entries);
+ }
+ }
+ mtx_unlock(&cpu_offset_mtx);
+
+ return (ret);
+}
+
int
iflib_device_register(device_t dev, void *sc, if_shared_ctx_t sctx, if_ctx_t *ctxp)
{
@@ -4518,6 +4575,11 @@
goto fail_queues;
/*
+ * Now that we know how many queues there are, get the core offset.
+ */
+ ctx->ifc_sysctl_core_offset = get_ctx_core_offset(ctx);
+
+ /*
* Group taskqueues aren't properly set up until SMP is started,
* so we disable interrupts until we can handle them post
* SI_SUB_SMP.
@@ -5073,6 +5135,7 @@
return (err);
break;
case MOD_UNLOAD:
+ /* Be sure to free the cpu_offsets list on success */
return (EBUSY);
default:
return (EOPNOTSUPP);
@@ -5558,7 +5621,7 @@
* Find the nth "close" core to the specified core
* "close" is defined as the deepest level that shares
* at least an L2 cache. With threads, this will be
- * threads on the same core. If the sahred cache is L3
+ * threads on the same core. If the shared cache is L3
* or higher, simply returns the same core.
*/
static int
@@ -5642,10 +5705,13 @@
const char *name)
{
device_t dev;
- int err, cpuid, tid;
+ int co, cpuid, err, tid;
dev = ctx->ifc_dev;
- cpuid = find_nth(ctx, qid);
+ co = ctx->ifc_sysctl_core_offset;
+ if (ctx->ifc_sysctl_separate_txrx && type == IFLIB_INTR_TX)
+ co += ctx->ifc_softc_ctx.isc_nrxqsets;
+ cpuid = find_nth(ctx, qid + co);
tid = get_core_offset(ctx, type, qid);
MPASS(tid >= 0);
cpuid = find_close_core(cpuid, tid);
@@ -6247,6 +6313,13 @@
SYSCTL_ADD_U16(ctx_list, oid_list, OID_AUTO, "tx_abdicate",
CTLFLAG_RWTUN, &ctx->ifc_sysctl_tx_abdicate, 0,
"cause tx to abdicate instead of running to completion");
+ ctx->ifc_sysctl_core_offset = CORE_OFFSET_UNSPECIFIED;
+ SYSCTL_ADD_U16(ctx_list, oid_list, OID_AUTO, "core_offset",
+ CTLFLAG_RDTUN, &ctx->ifc_sysctl_core_offset, 0,
+ "offset to start using cores at");
+ SYSCTL_ADD_U8(ctx_list, oid_list, OID_AUTO, "separate_txrx",
+ CTLFLAG_RDTUN, &ctx->ifc_sysctl_separate_txrx, 0,
+ "use separate cores for TX and RX");
/* XXX change for per-queue sizes */
SYSCTL_ADD_PROC(ctx_list, oid_list, OID_AUTO, "override_ntxds",

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