Changes to support crashdump analysis of netisr:
- Rename the netisr protocol registration array, 'np' to 'netisr_proto', in order to reduce the chances of symbol name collisions. It remains statically defined, but it will be looked up by netstat(1). - Move certain internal structure definitions from netisr.c to netisr_internal.h so that netstat(1) can find them. They remain private, and should not be used for any other purpose (for example, they should not be used by kernel modules, which must instead use the public interfaces in netisr.h). - Store a kernel-compiled version of NETISR_MAXPROT in the global variable netisr_maxprot, and export via a sysctl, so that it is available for use by netstat(1). This is especially important for crashdump interpretation, where the size of the workstream structure is determined by the maximum number of protocols compiled into the kernel. MFC after: 1 week Sponsored by: Juniper Networks
This commit is contained in:
Robert Watson
parent
ccd8bad0bb
commit
938448cd87
165
sys/net/netisr.c
165
sys/net/netisr.c
@ -87,9 +87,11 @@ __FBSDID("$FreeBSD$");
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#include <ddb/ddb.h>
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#endif
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#define _WANT_NETISR_INTERNAL /* Enable definitions from netisr_internal.h */
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/netisr.h>
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#include <net/netisr_internal.h>
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#include <net/vnet.h>
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/*-
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@ -99,7 +101,7 @@ __FBSDID("$FreeBSD$");
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*
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* The following data structures and fields are protected by this lock:
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*
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* - The np array, including all fields of struct netisr_proto.
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* - The netisr_proto array, including all fields of struct netisr_proto.
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* - The nws array, including all fields of struct netisr_worker.
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* - The nws_array array.
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*
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@ -194,79 +196,23 @@ SYSCTL_INT(_net_isr, OID_AUTO, defaultqlimit, CTLFLAG_RDTUN,
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"Default netisr per-protocol, per-CPU queue limit if not set by protocol");
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/*
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* Each protocol is described by a struct netisr_proto, which holds all
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* global per-protocol information. This data structure is set up by
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* netisr_register(), and derived from the public struct netisr_handler.
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* Store and export the compile-time constant NETISR_MAXPROT limit on the
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* number of protocols that can register with netisr at a time. This is
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* required for crashdump analysis, as it sizes netisr_proto[].
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*/
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struct netisr_proto {
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const char *np_name; /* Character string protocol name. */
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netisr_handler_t *np_handler; /* Protocol handler. */
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netisr_m2flow_t *np_m2flow; /* Query flow for untagged packet. */
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netisr_m2cpuid_t *np_m2cpuid; /* Query CPU to process packet on. */
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netisr_drainedcpu_t *np_drainedcpu; /* Callback when drained a queue. */
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u_int np_qlimit; /* Maximum per-CPU queue depth. */
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u_int np_policy; /* Work placement policy. */
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};
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#define NETISR_MAXPROT 16 /* Compile-time limit. */
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static u_int netisr_maxprot = NETISR_MAXPROT;
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SYSCTL_INT(_net_isr, OID_AUTO, maxprot, CTLFLAG_RD,
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&netisr_maxprot, 0,
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"Compile-time limit on the number of protocols supported by netisr.");
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/*
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* The np array describes all registered protocols, indexed by protocol
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* number.
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* The netisr_proto array describes all registered protocols, indexed by
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* protocol number. See netisr_internal.h for more details.
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*/
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static struct netisr_proto np[NETISR_MAXPROT];
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static struct netisr_proto netisr_proto[NETISR_MAXPROT];
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/*
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* Protocol-specific work for each workstream is described by struct
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* netisr_work. Each work descriptor consists of an mbuf queue and
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* statistics.
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*/
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struct netisr_work {
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/*
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* Packet queue, linked by m_nextpkt.
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*/
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struct mbuf *nw_head;
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struct mbuf *nw_tail;
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u_int nw_len;
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u_int nw_qlimit;
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u_int nw_watermark;
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/*
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* Statistics -- written unlocked, but mostly from curcpu.
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*/
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u_int64_t nw_dispatched; /* Number of direct dispatches. */
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u_int64_t nw_hybrid_dispatched; /* "" hybrid dispatches. */
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u_int64_t nw_qdrops; /* "" drops. */
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u_int64_t nw_queued; /* "" enqueues. */
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u_int64_t nw_handled; /* "" handled in worker. */
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};
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/*
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* Workstreams hold a queue of ordered work across each protocol, and are
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* described by netisr_workstream. Each workstream is associated with a
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* worker thread, which in turn is pinned to a CPU. Work associated with a
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* workstream can be processd in other threads during direct dispatch;
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* concurrent processing is prevented by the NWS_RUNNING flag, which
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* indicates that a thread is already processing the work queue. It is
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* important to prevent a directly dispatched packet from "skipping ahead" of
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* work already in the workstream queue.
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*/
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struct netisr_workstream {
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struct intr_event *nws_intr_event; /* Handler for stream. */
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void *nws_swi_cookie; /* swi(9) cookie for stream. */
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struct mtx nws_mtx; /* Synchronize work. */
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u_int nws_cpu; /* CPU pinning. */
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u_int nws_flags; /* Wakeup flags. */
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u_int nws_pendingbits; /* Scheduled protocols. */
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/*
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* Each protocol has per-workstream data.
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*/
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struct netisr_work nws_work[NETISR_MAXPROT];
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} __aligned(CACHE_LINE_SIZE);
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/*
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* Per-CPU workstream data.
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* Per-CPU workstream data. See netisr_internal.h for more details.
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*/
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DPCPU_DEFINE(struct netisr_workstream, nws);
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@ -285,13 +231,6 @@ static u_int nws_count;
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SYSCTL_INT(_net_isr, OID_AUTO, numthreads, CTLFLAG_RD,
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&nws_count, 0, "Number of extant netisr threads.");
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/*
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* Per-workstream flags.
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*/
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#define NWS_RUNNING 0x00000001 /* Currently running in a thread. */
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#define NWS_DISPATCHING 0x00000002 /* Currently being direct-dispatched. */
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#define NWS_SCHEDULED 0x00000004 /* Signal issued. */
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/*
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* Synchronization for each workstream: a mutex protects all mutable fields
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* in each stream, including per-protocol state (mbuf queues). The SWI is
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@ -380,32 +319,32 @@ netisr_register(const struct netisr_handler *nhp)
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* Test that no existing registration exists for this protocol.
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*/
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NETISR_WLOCK();
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KASSERT(np[proto].np_name == NULL,
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KASSERT(netisr_proto[proto].np_name == NULL,
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("%s(%u, %s): name present", __func__, proto, name));
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KASSERT(np[proto].np_handler == NULL,
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KASSERT(netisr_proto[proto].np_handler == NULL,
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("%s(%u, %s): handler present", __func__, proto, name));
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np[proto].np_name = name;
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np[proto].np_handler = nhp->nh_handler;
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np[proto].np_m2flow = nhp->nh_m2flow;
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np[proto].np_m2cpuid = nhp->nh_m2cpuid;
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np[proto].np_drainedcpu = nhp->nh_drainedcpu;
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netisr_proto[proto].np_name = name;
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netisr_proto[proto].np_handler = nhp->nh_handler;
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netisr_proto[proto].np_m2flow = nhp->nh_m2flow;
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netisr_proto[proto].np_m2cpuid = nhp->nh_m2cpuid;
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netisr_proto[proto].np_drainedcpu = nhp->nh_drainedcpu;
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if (nhp->nh_qlimit == 0)
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np[proto].np_qlimit = netisr_defaultqlimit;
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netisr_proto[proto].np_qlimit = netisr_defaultqlimit;
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else if (nhp->nh_qlimit > netisr_maxqlimit) {
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printf("%s: %s requested queue limit %u capped to "
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"net.isr.maxqlimit %u\n", __func__, name, nhp->nh_qlimit,
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netisr_maxqlimit);
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np[proto].np_qlimit = netisr_maxqlimit;
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netisr_proto[proto].np_qlimit = netisr_maxqlimit;
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} else
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np[proto].np_qlimit = nhp->nh_qlimit;
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np[proto].np_policy = nhp->nh_policy;
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netisr_proto[proto].np_qlimit = nhp->nh_qlimit;
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netisr_proto[proto].np_policy = nhp->nh_policy;
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for (i = 0; i <= mp_maxid; i++) {
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if (CPU_ABSENT(i))
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continue;
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npwp = &(DPCPU_ID_PTR(i, nws))->nws_work[proto];
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bzero(npwp, sizeof(*npwp));
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npwp->nw_qlimit = np[proto].np_qlimit;
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npwp->nw_qlimit = netisr_proto[proto].np_qlimit;
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}
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NETISR_WUNLOCK();
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}
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@ -430,7 +369,7 @@ netisr_clearqdrops(const struct netisr_handler *nhp)
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("%s(%u): protocol too big for %s", __func__, proto, name));
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NETISR_WLOCK();
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KASSERT(np[proto].np_handler != NULL,
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KASSERT(netisr_proto[proto].np_handler != NULL,
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("%s(%u): protocol not registered for %s", __func__, proto,
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name));
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@ -465,7 +404,7 @@ netisr_getqdrops(const struct netisr_handler *nhp, u_int64_t *qdropp)
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("%s(%u): protocol too big for %s", __func__, proto, name));
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NETISR_RLOCK(&tracker);
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KASSERT(np[proto].np_handler != NULL,
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KASSERT(netisr_proto[proto].np_handler != NULL,
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("%s(%u): protocol not registered for %s", __func__, proto,
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name));
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@ -498,10 +437,10 @@ netisr_getqlimit(const struct netisr_handler *nhp, u_int *qlimitp)
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("%s(%u): protocol too big for %s", __func__, proto, name));
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NETISR_RLOCK(&tracker);
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KASSERT(np[proto].np_handler != NULL,
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KASSERT(netisr_proto[proto].np_handler != NULL,
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("%s(%u): protocol not registered for %s", __func__, proto,
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name));
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*qlimitp = np[proto].np_qlimit;
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*qlimitp = netisr_proto[proto].np_qlimit;
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NETISR_RUNLOCK(&tracker);
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}
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@ -530,11 +469,11 @@ netisr_setqlimit(const struct netisr_handler *nhp, u_int qlimit)
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("%s(%u): protocol too big for %s", __func__, proto, name));
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NETISR_WLOCK();
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KASSERT(np[proto].np_handler != NULL,
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KASSERT(netisr_proto[proto].np_handler != NULL,
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("%s(%u): protocol not registered for %s", __func__, proto,
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name));
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np[proto].np_qlimit = qlimit;
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netisr_proto[proto].np_qlimit = qlimit;
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for (i = 0; i <= mp_maxid; i++) {
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if (CPU_ABSENT(i))
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continue;
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@ -591,16 +530,16 @@ netisr_unregister(const struct netisr_handler *nhp)
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("%s(%u): protocol too big for %s", __func__, proto, name));
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NETISR_WLOCK();
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KASSERT(np[proto].np_handler != NULL,
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KASSERT(netisr_proto[proto].np_handler != NULL,
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("%s(%u): protocol not registered for %s", __func__, proto,
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name));
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np[proto].np_name = NULL;
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np[proto].np_handler = NULL;
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np[proto].np_m2flow = NULL;
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np[proto].np_m2cpuid = NULL;
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np[proto].np_qlimit = 0;
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np[proto].np_policy = 0;
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netisr_proto[proto].np_name = NULL;
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netisr_proto[proto].np_handler = NULL;
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netisr_proto[proto].np_m2flow = NULL;
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netisr_proto[proto].np_m2cpuid = NULL;
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netisr_proto[proto].np_qlimit = 0;
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netisr_proto[proto].np_policy = 0;
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for (i = 0; i <= mp_maxid; i++) {
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if (CPU_ABSENT(i))
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continue;
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@ -720,13 +659,13 @@ netisr_process_workstream_proto(struct netisr_workstream *nwsp, u_int proto)
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local_npw.nw_len--;
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VNET_ASSERT(m->m_pkthdr.rcvif != NULL);
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CURVNET_SET(m->m_pkthdr.rcvif->if_vnet);
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np[proto].np_handler(m);
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netisr_proto[proto].np_handler(m);
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CURVNET_RESTORE();
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}
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KASSERT(local_npw.nw_len == 0,
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("%s(%u): len %u", __func__, proto, local_npw.nw_len));
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if (np[proto].np_drainedcpu)
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np[proto].np_drainedcpu(nwsp->nws_cpu);
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if (netisr_proto[proto].np_drainedcpu)
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netisr_proto[proto].np_drainedcpu(nwsp->nws_cpu);
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NWS_LOCK(nwsp);
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npwp->nw_handled += handled;
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return (handled);
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@ -862,10 +801,10 @@ netisr_queue_src(u_int proto, uintptr_t source, struct mbuf *m)
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#ifdef NETISR_LOCKING
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NETISR_RLOCK(&tracker);
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#endif
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KASSERT(np[proto].np_handler != NULL,
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KASSERT(netisr_proto[proto].np_handler != NULL,
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("%s: invalid proto %u", __func__, proto));
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m = netisr_select_cpuid(&np[proto], source, m, &cpuid);
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m = netisr_select_cpuid(&netisr_proto[proto], source, m, &cpuid);
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if (m != NULL) {
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KASSERT(!CPU_ABSENT(cpuid), ("%s: CPU %u absent", __func__,
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cpuid));
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@ -911,7 +850,7 @@ netisr_dispatch_src(u_int proto, uintptr_t source, struct mbuf *m)
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#ifdef NETISR_LOCKING
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NETISR_RLOCK(&tracker);
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#endif
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KASSERT(np[proto].np_handler != NULL,
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KASSERT(netisr_proto[proto].np_handler != NULL,
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("%s: invalid proto %u", __func__, proto));
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/*
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@ -926,7 +865,7 @@ netisr_dispatch_src(u_int proto, uintptr_t source, struct mbuf *m)
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npwp = &nwsp->nws_work[proto];
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npwp->nw_dispatched++;
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npwp->nw_handled++;
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np[proto].np_handler(m);
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netisr_proto[proto].np_handler(m);
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error = 0;
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goto out_unlock;
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}
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@ -936,7 +875,7 @@ netisr_dispatch_src(u_int proto, uintptr_t source, struct mbuf *m)
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* dispatch if we're on the right CPU and the netisr worker isn't
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* already running.
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*/
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m = netisr_select_cpuid(&np[proto], source, m, &cpuid);
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m = netisr_select_cpuid(&netisr_proto[proto], source, m, &cpuid);
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if (m == NULL) {
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error = ENOBUFS;
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goto out_unlock;
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@ -973,7 +912,7 @@ netisr_dispatch_src(u_int proto, uintptr_t source, struct mbuf *m)
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*/
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nwsp->nws_flags |= NWS_DISPATCHING;
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NWS_UNLOCK(nwsp);
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np[proto].np_handler(m);
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netisr_proto[proto].np_handler(m);
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NWS_LOCK(nwsp);
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nwsp->nws_flags &= ~NWS_DISPATCHING;
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npwp->nw_handled++;
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@ -1149,7 +1088,7 @@ sysctl_netisr_proto(SYSCTL_HANDLER_ARGS)
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counter = 0;
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NETISR_RLOCK(&tracker);
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for (proto = 0; proto < NETISR_MAXPROT; proto++) {
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npp = &np[proto];
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npp = &netisr_proto[proto];
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if (npp->np_name == NULL)
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continue;
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snpp = &snp_array[counter];
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@ -1261,7 +1200,7 @@ sysctl_netisr_work(SYSCTL_HANDLER_ARGS)
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continue;
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NWS_LOCK(nwsp);
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for (proto = 0; proto < NETISR_MAXPROT; proto++) {
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npp = &np[proto];
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npp = &netisr_proto[proto];
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if (npp->np_name == NULL)
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continue;
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nwp = &nwsp->nws_work[proto];
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@ -1312,7 +1251,7 @@ DB_SHOW_COMMAND(netisr, db_show_netisr)
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continue;
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first = 1;
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for (proto = 0; proto < NETISR_MAXPROT; proto++) {
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if (np[proto].np_handler == NULL)
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if (netisr_proto[proto].np_handler == NULL)
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continue;
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nwp = &nwsp->nws_work[proto];
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if (first) {
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@ -1322,7 +1261,7 @@ DB_SHOW_COMMAND(netisr, db_show_netisr)
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db_printf("%3s ", "");
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db_printf(
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"%6s %5d %5d %5d %8ju %8ju %8ju %8ju\n",
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np[proto].np_name, nwp->nw_len,
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netisr_proto[proto].np_name, nwp->nw_len,
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nwp->nw_watermark, nwp->nw_qlimit,
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nwp->nw_dispatched, nwp->nw_hybrid_dispatched,
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nwp->nw_qdrops, nwp->nw_queued);
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127
sys/net/netisr_internal.h
Normal file
127
sys/net/netisr_internal.h
Normal file
@ -0,0 +1,127 @@
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/*-
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* Copyright (c) 2007-2009 Robert N. M. Watson
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* Copyright (c) 2010 Juniper Networks, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert N. M. Watson under contract
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* to Juniper Networks, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
|
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* modification, are permitted provided that the following conditions
|
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* are met:
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* 1. Redistributions of source code must retain the above copyright
|
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* notice, this list of conditions and the following disclaimer.
|
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* 2. Redistributions in binary form must reproduce the above copyright
|
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* notice, this list of conditions and the following disclaimer in the
|
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* documentation and/or other materials provided with the distribution.
|
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*
|
||||
* $FreeBSD$
|
||||
*/
|
||||
|
||||
#ifndef _NET_NETISR_INTERNAL_H_
|
||||
#define _NET_NETISR_INTERNAL_H_
|
||||
|
||||
#ifndef _WANT_NETISR_INTERNAL
|
||||
#error "no user-serviceable parts inside"
|
||||
#endif
|
||||
|
||||
/*
|
||||
* These definitions are private to the netisr implementation, but provided
|
||||
* here for use by post-mortem crashdump analysis tools. They should not be
|
||||
* used in any other context as they can and will change. Public definitions
|
||||
* may be found in netisr.h.
|
||||
*/
|
||||
|
||||
#ifndef _KERNEL
|
||||
typedef void *netisr_handler_t;
|
||||
typedef void *netisr_m2flow_t;
|
||||
typedef void *netisr_m2cpuid_t;
|
||||
typedef void *netisr_drainedcpu_t;
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Each protocol is described by a struct netisr_proto, which holds all
|
||||
* global per-protocol information. This data structure is set up by
|
||||
* netisr_register(), and derived from the public struct netisr_handler.
|
||||
*/
|
||||
struct netisr_proto {
|
||||
const char *np_name; /* Character string protocol name. */
|
||||
netisr_handler_t *np_handler; /* Protocol handler. */
|
||||
netisr_m2flow_t *np_m2flow; /* Query flow for untagged packet. */
|
||||
netisr_m2cpuid_t *np_m2cpuid; /* Query CPU to process packet on. */
|
||||
netisr_drainedcpu_t *np_drainedcpu; /* Callback when drained a queue. */
|
||||
u_int np_qlimit; /* Maximum per-CPU queue depth. */
|
||||
u_int np_policy; /* Work placement policy. */
|
||||
};
|
||||
|
||||
#define NETISR_MAXPROT 16 /* Compile-time limit. */
|
||||
|
||||
/*
|
||||
* Protocol-specific work for each workstream is described by struct
|
||||
* netisr_work. Each work descriptor consists of an mbuf queue and
|
||||
* statistics.
|
||||
*/
|
||||
struct netisr_work {
|
||||
/*
|
||||
* Packet queue, linked by m_nextpkt.
|
||||
*/
|
||||
struct mbuf *nw_head;
|
||||
struct mbuf *nw_tail;
|
||||
u_int nw_len;
|
||||
u_int nw_qlimit;
|
||||
u_int nw_watermark;
|
||||
|
||||
/*
|
||||
* Statistics -- written unlocked, but mostly from curcpu.
|
||||
*/
|
||||
u_int64_t nw_dispatched; /* Number of direct dispatches. */
|
||||
u_int64_t nw_hybrid_dispatched; /* "" hybrid dispatches. */
|
||||
u_int64_t nw_qdrops; /* "" drops. */
|
||||
u_int64_t nw_queued; /* "" enqueues. */
|
||||
u_int64_t nw_handled; /* "" handled in worker. */
|
||||
};
|
||||
|
||||
/*
|
||||
* Workstreams hold a queue of ordered work across each protocol, and are
|
||||
* described by netisr_workstream. Each workstream is associated with a
|
||||
* worker thread, which in turn is pinned to a CPU. Work associated with a
|
||||
* workstream can be processd in other threads during direct dispatch;
|
||||
* concurrent processing is prevented by the NWS_RUNNING flag, which
|
||||
* indicates that a thread is already processing the work queue. It is
|
||||
* important to prevent a directly dispatched packet from "skipping ahead" of
|
||||
* work already in the workstream queue.
|
||||
*/
|
||||
struct netisr_workstream {
|
||||
struct intr_event *nws_intr_event; /* Handler for stream. */
|
||||
void *nws_swi_cookie; /* swi(9) cookie for stream. */
|
||||
struct mtx nws_mtx; /* Synchronize work. */
|
||||
u_int nws_cpu; /* CPU pinning. */
|
||||
u_int nws_flags; /* Wakeup flags. */
|
||||
u_int nws_pendingbits; /* Scheduled protocols. */
|
||||
|
||||
/*
|
||||
* Each protocol has per-workstream data.
|
||||
*/
|
||||
struct netisr_work nws_work[NETISR_MAXPROT];
|
||||
} __aligned(CACHE_LINE_SIZE);
|
||||
|
||||
/*
|
||||
* Per-workstream flags.
|
||||
*/
|
||||
#define NWS_RUNNING 0x00000001 /* Currently running in a thread. */
|
||||
#define NWS_DISPATCHING 0x00000002 /* Currently being direct-dispatched. */
|
||||
#define NWS_SCHEDULED 0x00000004 /* Signal issued. */
|
||||
|
||||
#endif /* !_NET_NETISR_INTERNAL_H_ */
|
||||
Loading…
Reference in New Issue
Block a user