ktls: Defer creation of threads and zones until first use.
Run ktls_init() when the first KTLS session is created rather than unconditionally during boot. This avoids creating unused threads and allocating unused resources on systems which do not use KTLS. Reviewed by: gallatin, markj Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D32487
This commit is contained in:
John Baldwin
parent
86929782cf
commit
a72ee35564
@ -109,6 +109,9 @@ static struct proc *ktls_proc;
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static uma_zone_t ktls_session_zone;
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static uma_zone_t ktls_buffer_zone;
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static uint16_t ktls_cpuid_lookup[MAXCPU];
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static int ktls_init_state;
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static struct sx ktls_init_lock;
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SX_SYSINIT(ktls_init_lock, &ktls_init_lock, "ktls init");
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SYSCTL_NODE(_kern_ipc, OID_AUTO, tls, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"Kernel TLS offload");
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@ -379,12 +382,11 @@ ktls_free_mext_contig(struct mbuf *m)
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uma_zfree(ktls_buffer_zone, (void *)PHYS_TO_DMAP(m->m_epg_pa[0]));
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}
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static void
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ktls_init(void *dummy __unused)
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static int
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ktls_init(void)
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{
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struct thread *td;
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struct pcpu *pc;
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cpuset_t mask;
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int count, domain, error, i;
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ktls_wq = malloc(sizeof(*ktls_wq) * (mp_maxid + 1), M_KTLS,
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@ -410,36 +412,40 @@ ktls_init(void *dummy __unused)
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STAILQ_INIT(&ktls_wq[i].m_head);
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STAILQ_INIT(&ktls_wq[i].so_head);
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mtx_init(&ktls_wq[i].mtx, "ktls work queue", NULL, MTX_DEF);
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error = kproc_kthread_add(ktls_work_thread, &ktls_wq[i],
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&ktls_proc, &td, 0, 0, "KTLS", "thr_%d", i);
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if (error)
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panic("Can't add KTLS thread %d error %d", i, error);
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/*
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* Bind threads to cores. If ktls_bind_threads is >
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* 1, then we bind to the NUMA domain.
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*/
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if (ktls_bind_threads) {
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if (ktls_bind_threads > 1) {
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pc = pcpu_find(i);
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domain = pc->pc_domain;
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CPU_COPY(&cpuset_domain[domain], &mask);
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count = ktls_domains[domain].count;
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ktls_domains[domain].cpu[count] = i;
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ktls_domains[domain].count++;
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} else {
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CPU_SETOF(i, &mask);
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}
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error = cpuset_setthread(td->td_tid, &mask);
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if (error)
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panic(
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"Unable to bind KTLS thread for CPU %d error %d",
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i, error);
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if (ktls_bind_threads > 1) {
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pc = pcpu_find(i);
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domain = pc->pc_domain;
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count = ktls_domains[domain].count;
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ktls_domains[domain].cpu[count] = i;
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ktls_domains[domain].count++;
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}
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ktls_cpuid_lookup[ktls_number_threads] = i;
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ktls_number_threads++;
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}
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/*
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* If we somehow have an empty domain, fall back to choosing
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* among all KTLS threads.
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*/
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if (ktls_bind_threads > 1) {
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for (i = 0; i < vm_ndomains; i++) {
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if (ktls_domains[i].count == 0) {
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ktls_bind_threads = 1;
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break;
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}
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}
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}
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/* Start kthreads for each workqueue. */
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CPU_FOREACH(i) {
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error = kproc_kthread_add(ktls_work_thread, &ktls_wq[i],
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&ktls_proc, &td, 0, 0, "KTLS", "thr_%d", i);
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if (error) {
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printf("Can't add KTLS thread %d error %d\n", i, error);
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return (error);
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}
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}
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/*
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* Start an allocation thread per-domain to perform blocking allocations
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* of 16k physically contiguous TLS crypto destination buffers.
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@ -454,35 +460,46 @@ ktls_init(void *dummy __unused)
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&ktls_domains[domain], &ktls_proc,
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&ktls_domains[domain].alloc_td.td,
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0, 0, "KTLS", "alloc_%d", domain);
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if (error)
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panic("Can't add KTLS alloc thread %d error %d",
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if (error) {
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printf("Can't add KTLS alloc thread %d error %d\n",
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domain, error);
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CPU_COPY(&cpuset_domain[domain], &mask);
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error = cpuset_setthread(ktls_domains[domain].alloc_td.td->td_tid,
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&mask);
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if (error)
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panic("Unable to bind KTLS alloc %d error %d",
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domain, error);
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}
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}
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/*
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* If we somehow have an empty domain, fall back to choosing
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* among all KTLS threads.
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*/
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if (ktls_bind_threads > 1) {
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for (i = 0; i < vm_ndomains; i++) {
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if (ktls_domains[i].count == 0) {
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ktls_bind_threads = 1;
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break;
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return (error);
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}
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}
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}
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if (bootverbose)
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printf("KTLS: Initialized %d threads\n", ktls_number_threads);
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return (0);
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}
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static int
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ktls_start_kthreads(void)
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{
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int error, state;
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start:
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state = atomic_load_acq_int(&ktls_init_state);
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if (__predict_true(state > 0))
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return (0);
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if (state < 0)
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return (ENXIO);
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sx_xlock(&ktls_init_lock);
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if (ktls_init_state != 0) {
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sx_xunlock(&ktls_init_lock);
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goto start;
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}
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error = ktls_init();
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if (error == 0)
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state = 1;
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else
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state = -1;
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atomic_store_rel_int(&ktls_init_state, state);
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sx_xunlock(&ktls_init_lock);
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return (error);
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}
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SYSINIT(ktls, SI_SUB_SMP + 1, SI_ORDER_ANY, ktls_init, NULL);
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#if defined(INET) || defined(INET6)
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static int
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@ -583,6 +600,10 @@ ktls_create_session(struct socket *so, struct tls_enable *en,
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return (EINVAL);
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}
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error = ktls_start_kthreads();
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if (error != 0)
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return (error);
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tls = uma_zalloc(ktls_session_zone, M_WAITOK | M_ZERO);
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counter_u64_add(ktls_offload_active, 1);
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@ -2457,6 +2478,18 @@ ktls_encrypt_async(struct ktls_wq *wq, struct mbuf *top)
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CURVNET_RESTORE();
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}
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static int
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ktls_bind_domain(int domain)
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{
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int error;
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error = cpuset_setthread(curthread->td_tid, &cpuset_domain[domain]);
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if (error != 0)
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return (error);
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curthread->td_domain.dr_policy = DOMAINSET_PREF(domain);
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return (0);
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}
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static void
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ktls_alloc_thread(void *ctx)
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{
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@ -2465,14 +2498,16 @@ ktls_alloc_thread(void *ctx)
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void **buf;
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struct sysctl_oid *oid;
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char name[80];
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int i, nbufs;
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int domain, error, i, nbufs;
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curthread->td_domain.dr_policy =
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DOMAINSET_PREF(PCPU_GET(domain));
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snprintf(name, sizeof(name), "domain%d", PCPU_GET(domain));
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domain = ktls_domain - ktls_domains;
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if (bootverbose)
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printf("Starting KTLS alloc thread for domain %d\n",
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PCPU_GET(domain));
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printf("Starting KTLS alloc thread for domain %d\n", domain);
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error = ktls_bind_domain(domain);
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if (error)
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printf("Unable to bind KTLS alloc thread for domain %d: error %d\n",
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domain, error);
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snprintf(name, sizeof(name), "domain%d", domain);
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oid = SYSCTL_ADD_NODE(NULL, SYSCTL_STATIC_CHILDREN(_kern_ipc_tls), OID_AUTO,
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name, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "");
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SYSCTL_ADD_U64(NULL, SYSCTL_CHILDREN(oid), OID_AUTO, "allocs",
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@ -2527,10 +2562,32 @@ ktls_work_thread(void *ctx)
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struct socket *so, *son;
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STAILQ_HEAD(, mbuf) local_m_head;
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STAILQ_HEAD(, socket) local_so_head;
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int cpu;
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if (ktls_bind_threads > 1) {
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curthread->td_domain.dr_policy =
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DOMAINSET_PREF(PCPU_GET(domain));
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cpu = wq - ktls_wq;
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if (bootverbose)
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printf("Starting KTLS worker thread for CPU %d\n", cpu);
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/*
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* Bind to a core. If ktls_bind_threads is > 1, then
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* we bind to the NUMA domain instead.
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*/
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if (ktls_bind_threads) {
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int error;
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if (ktls_bind_threads > 1) {
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struct pcpu *pc = pcpu_find(cpu);
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error = ktls_bind_domain(pc->pc_domain);
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} else {
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cpuset_t mask;
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CPU_SETOF(cpu, &mask);
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error = cpuset_setthread(curthread->td_tid, &mask);
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}
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if (error)
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printf("Unable to bind KTLS worker thread for CPU %d: error %d\n",
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cpu, error);
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}
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#if defined(__aarch64__) || defined(__amd64__) || defined(__i386__)
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fpu_kern_thread(0);
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