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iflib.c
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/*-
* Copyright (c) 2014-2018, Matthew Macy <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Neither the name of Matthew Macy nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_acpi.h"
#include "opt_sched.h"
#include <sys/param.h>
#include <sys/types.h>
#include <sys/bus.h>
#include <sys/eventhandler.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/module.h>
#include <sys/kobj.h>
#include <sys/rman.h>
#include <sys/sbuf.h>
#include <sys/smp.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/taskqueue.h>
#include <sys/limits.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_private.h>
#include <net/if_types.h>
#include <net/if_media.h>
#include <net/bpf.h>
#include <net/ethernet.h>
#include <net/mp_ring.h>
#include <net/debugnet.h>
#include <net/pfil.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netinet/tcp_lro.h>
#include <netinet/in_systm.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/tcp.h>
#include <netinet/ip_var.h>
#include <netinet6/ip6_var.h>
#include <machine/bus.h>
#include <machine/in_cksum.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <dev/led/led.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pci_private.h>
#include <net/iflib.h>
#include "ifdi_if.h"
#ifdef PCI_IOV
#include <dev/pci/pci_iov.h>
#endif
#include <sys/bitstring.h>
/*
* enable accounting of every mbuf as it comes in to and goes out of
* iflib's software descriptor references
*/
#define MEMORY_LOGGING 0
/*
* Enable mbuf vectors for compressing long mbuf chains
*/
/*
* NB:
* - Prefetching in tx cleaning should perhaps be a tunable. The distance ahead
* we prefetch needs to be determined by the time spent in m_free vis a vis
* the cost of a prefetch. This will of course vary based on the workload:
* - NFLX's m_free path is dominated by vm-based M_EXT manipulation which
* is quite expensive, thus suggesting very little prefetch.
* - small packet forwarding which is just returning a single mbuf to
* UMA will typically be very fast vis a vis the cost of a memory
* access.
*/
/*
* File organization:
* - private structures
* - iflib private utility functions
* - ifnet functions
* - vlan registry and other exported functions
* - iflib public core functions
*
*
*/
static MALLOC_DEFINE(M_IFLIB, "iflib", "ifnet library");
#define IFLIB_RXEOF_MORE (1U << 0)
#define IFLIB_RXEOF_EMPTY (2U << 0)
struct iflib_txq;
typedef struct iflib_txq *iflib_txq_t;
struct iflib_rxq;
typedef struct iflib_rxq *iflib_rxq_t;
struct iflib_fl;
typedef struct iflib_fl *iflib_fl_t;
struct iflib_ctx;
static void iru_init(if_rxd_update_t iru, iflib_rxq_t rxq, uint8_t flid);
static void iflib_timer(void *arg);
static void iflib_tqg_detach(if_ctx_t ctx);
typedef struct iflib_filter_info {
driver_filter_t *ifi_filter;
void *ifi_filter_arg;
struct grouptask *ifi_task;
void *ifi_ctx;
} *iflib_filter_info_t;
struct iflib_ctx {
KOBJ_FIELDS;
/*
* Pointer to hardware driver's softc
*/
void *ifc_softc;
device_t ifc_dev;
if_t ifc_ifp;
cpuset_t ifc_cpus;
if_shared_ctx_t ifc_sctx;
struct if_softc_ctx ifc_softc_ctx;
struct sx ifc_ctx_sx;
struct mtx ifc_state_mtx;
iflib_txq_t ifc_txqs;
iflib_rxq_t ifc_rxqs;
uint32_t ifc_if_flags;
uint32_t ifc_flags;
uint32_t ifc_max_fl_buf_size;
uint32_t ifc_rx_mbuf_sz;
int ifc_link_state;
int ifc_watchdog_events;
struct cdev *ifc_led_dev;
struct resource *ifc_msix_mem;
struct if_irq ifc_legacy_irq;
struct task ifc_admin_task;
struct task ifc_vflr_task;
struct taskqueue *ifc_tq;
struct iflib_filter_info ifc_filter_info;
struct ifmedia ifc_media;
struct ifmedia *ifc_mediap;
struct sysctl_oid *ifc_sysctl_node;
uint16_t ifc_sysctl_ntxqs;
uint16_t ifc_sysctl_nrxqs;
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;
uint8_t ifc_sysctl_use_logical_cores;
uint16_t ifc_sysctl_extra_msix_vectors;
bool ifc_cpus_are_physical_cores;
qidx_t ifc_sysctl_ntxds[8];
qidx_t ifc_sysctl_nrxds[8];
struct if_txrx ifc_txrx;
#define isc_txd_encap ifc_txrx.ift_txd_encap
#define isc_txd_flush ifc_txrx.ift_txd_flush
#define isc_txd_credits_update ifc_txrx.ift_txd_credits_update
#define isc_rxd_available ifc_txrx.ift_rxd_available
#define isc_rxd_pkt_get ifc_txrx.ift_rxd_pkt_get
#define isc_rxd_refill ifc_txrx.ift_rxd_refill
#define isc_rxd_flush ifc_txrx.ift_rxd_flush
#define isc_legacy_intr ifc_txrx.ift_legacy_intr
#define isc_txq_select ifc_txrx.ift_txq_select
#define isc_txq_select_v2 ifc_txrx.ift_txq_select_v2
eventhandler_tag ifc_vlan_attach_event;
eventhandler_tag ifc_vlan_detach_event;
struct ether_addr ifc_mac;
};
void *
iflib_get_softc(if_ctx_t ctx)
{
return (ctx->ifc_softc);
}
device_t
iflib_get_dev(if_ctx_t ctx)
{
return (ctx->ifc_dev);
}
if_t
iflib_get_ifp(if_ctx_t ctx)
{
return (ctx->ifc_ifp);
}
struct ifmedia *
iflib_get_media(if_ctx_t ctx)
{
return (ctx->ifc_mediap);
}
void
iflib_set_mac(if_ctx_t ctx, uint8_t mac[ETHER_ADDR_LEN])
{
bcopy(mac, ctx->ifc_mac.octet, ETHER_ADDR_LEN);
}
if_softc_ctx_t
iflib_get_softc_ctx(if_ctx_t ctx)
{
return (&ctx->ifc_softc_ctx);
}
if_shared_ctx_t
iflib_get_sctx(if_ctx_t ctx)
{
return (ctx->ifc_sctx);
}
uint16_t
iflib_get_extra_msix_vectors_sysctl(if_ctx_t ctx)
{
return (ctx->ifc_sysctl_extra_msix_vectors);
}
#define IP_ALIGNED(m) ((((uintptr_t)(m)->m_data) & 0x3) == 0x2)
#define CACHE_PTR_INCREMENT (CACHE_LINE_SIZE / sizeof(void *))
#define CACHE_PTR_NEXT(ptr) ((void *)(((uintptr_t)(ptr) + CACHE_LINE_SIZE - 1) & (CACHE_LINE_SIZE - 1)))
#define LINK_ACTIVE(ctx) ((ctx)->ifc_link_state == LINK_STATE_UP)
#define CTX_IS_VF(ctx) ((ctx)->ifc_sctx->isc_flags & IFLIB_IS_VF)
typedef struct iflib_sw_rx_desc_array {
bus_dmamap_t *ifsd_map; /* bus_dma maps for packet */
struct mbuf **ifsd_m; /* pkthdr mbufs */
caddr_t *ifsd_cl; /* direct cluster pointer for rx */
bus_addr_t *ifsd_ba; /* bus addr of cluster for rx */
} iflib_rxsd_array_t;
typedef struct iflib_sw_tx_desc_array {
bus_dmamap_t *ifsd_map; /* bus_dma maps for packet */
bus_dmamap_t *ifsd_tso_map; /* bus_dma maps for TSO packet */
struct mbuf **ifsd_m; /* pkthdr mbufs */
} if_txsd_vec_t;
/* magic number that should be high enough for any hardware */
#define IFLIB_MAX_TX_SEGS 128
#define IFLIB_RX_COPY_THRESH 128
#define IFLIB_MAX_RX_REFRESH 32
/* The minimum descriptors per second before we start coalescing */
#define IFLIB_MIN_DESC_SEC 16384
#define IFLIB_DEFAULT_TX_UPDATE_FREQ 16
#define IFLIB_QUEUE_IDLE 0
#define IFLIB_QUEUE_HUNG 1
#define IFLIB_QUEUE_WORKING 2
/* maximum number of txqs that can share an rx interrupt */
#define IFLIB_MAX_TX_SHARED_INTR 4
/* this should really scale with ring size - this is a fairly arbitrary value */
#define TX_BATCH_SIZE 32
#define IFLIB_RESTART_BUDGET 8
#define IFC_LEGACY 0x001
#define IFC_QFLUSH 0x002
#define IFC_MULTISEG 0x004
#define IFC_SPARE1 0x008
#define IFC_SC_ALLOCATED 0x010
#define IFC_INIT_DONE 0x020
#define IFC_PREFETCH 0x040
#define IFC_DO_RESET 0x080
#define IFC_DO_WATCHDOG 0x100
#define IFC_SPARE0 0x200
#define IFC_SPARE2 0x400
#define IFC_IN_DETACH 0x800
#define IFC_NETMAP_TX_IRQ 0x80000000
#define CSUM_OFFLOAD (CSUM_IP_TSO | CSUM_IP6_TSO | CSUM_IP | \
CSUM_IP_UDP | CSUM_IP_TCP | CSUM_IP_SCTP | \
CSUM_IP6_UDP | CSUM_IP6_TCP | CSUM_IP6_SCTP)
struct iflib_txq {
qidx_t ift_in_use;
qidx_t ift_cidx;
qidx_t ift_cidx_processed;
qidx_t ift_pidx;
uint8_t ift_gen;
uint8_t ift_br_offset;
uint16_t ift_npending;
uint16_t ift_db_pending;
uint16_t ift_rs_pending;
/* implicit pad */
uint8_t ift_txd_size[8];
uint64_t ift_processed;
uint64_t ift_cleaned;
uint64_t ift_cleaned_prev;
#if MEMORY_LOGGING
uint64_t ift_enqueued;
uint64_t ift_dequeued;
#endif
uint64_t ift_no_tx_dma_setup;
uint64_t ift_no_desc_avail;
uint64_t ift_mbuf_defrag_failed;
uint64_t ift_mbuf_defrag;
uint64_t ift_map_failed;
uint64_t ift_txd_encap_efbig;
uint64_t ift_pullups;
uint64_t ift_last_timer_tick;
struct mtx ift_mtx;
struct mtx ift_db_mtx;
/* constant values */
if_ctx_t ift_ctx;
struct ifmp_ring *ift_br;
struct grouptask ift_task;
qidx_t ift_size;
uint16_t ift_id;
struct callout ift_timer;
#ifdef DEV_NETMAP
struct callout ift_netmap_timer;
#endif /* DEV_NETMAP */
if_txsd_vec_t ift_sds;
uint8_t ift_qstatus;
uint8_t ift_closed;
uint8_t ift_update_freq;
struct iflib_filter_info ift_filter_info;
bus_dma_tag_t ift_buf_tag;
bus_dma_tag_t ift_tso_buf_tag;
iflib_dma_info_t ift_ifdi;
#define MTX_NAME_LEN 32
char ift_mtx_name[MTX_NAME_LEN];
bus_dma_segment_t ift_segs[IFLIB_MAX_TX_SEGS] __aligned(CACHE_LINE_SIZE);
#ifdef IFLIB_DIAGNOSTICS
uint64_t ift_cpu_exec_count[256];
#endif
} __aligned(CACHE_LINE_SIZE);
struct iflib_fl {
qidx_t ifl_cidx;
qidx_t ifl_pidx;
qidx_t ifl_credits;
uint8_t ifl_gen;
uint8_t ifl_rxd_size;
#if MEMORY_LOGGING
uint64_t ifl_m_enqueued;
uint64_t ifl_m_dequeued;
uint64_t ifl_cl_enqueued;
uint64_t ifl_cl_dequeued;
#endif
/* implicit pad */
bitstr_t *ifl_rx_bitmap;
qidx_t ifl_fragidx;
/* constant */
qidx_t ifl_size;
uint16_t ifl_buf_size;
uint16_t ifl_cltype;
uma_zone_t ifl_zone;
iflib_rxsd_array_t ifl_sds;
iflib_rxq_t ifl_rxq;
uint8_t ifl_id;
bus_dma_tag_t ifl_buf_tag;
iflib_dma_info_t ifl_ifdi;
uint64_t ifl_bus_addrs[IFLIB_MAX_RX_REFRESH] __aligned(CACHE_LINE_SIZE);
qidx_t ifl_rxd_idxs[IFLIB_MAX_RX_REFRESH];
} __aligned(CACHE_LINE_SIZE);
static inline qidx_t
get_inuse(int size, qidx_t cidx, qidx_t pidx, uint8_t gen)
{
qidx_t used;
if (pidx > cidx)
used = pidx - cidx;
else if (pidx < cidx)
used = size - cidx + pidx;
else if (gen == 0 && pidx == cidx)
used = 0;
else if (gen == 1 && pidx == cidx)
used = size;
else
panic("bad state");
return (used);
}
#define TXQ_AVAIL(txq) (txq->ift_size - get_inuse(txq->ift_size, txq->ift_cidx, txq->ift_pidx, txq->ift_gen))
#define IDXDIFF(head, tail, wrap) \
((head) >= (tail) ? (head) - (tail) : (wrap) - (tail) + (head))
struct iflib_rxq {
if_ctx_t ifr_ctx;
iflib_fl_t ifr_fl;
uint64_t ifr_rx_irq;
struct pfil_head *pfil;
/*
* If there is a separate completion queue (IFLIB_HAS_RXCQ), this is
* the completion queue consumer index. Otherwise it's unused.
*/
qidx_t ifr_cq_cidx;
uint16_t ifr_id;
uint8_t ifr_nfl;
uint8_t ifr_ntxqirq;
uint8_t ifr_txqid[IFLIB_MAX_TX_SHARED_INTR];
uint8_t ifr_fl_offset;
struct lro_ctrl ifr_lc;
struct grouptask ifr_task;
struct callout ifr_watchdog;
struct iflib_filter_info ifr_filter_info;
iflib_dma_info_t ifr_ifdi;
/* dynamically allocate if any drivers need a value substantially larger than this */
struct if_rxd_frag ifr_frags[IFLIB_MAX_RX_SEGS] __aligned(CACHE_LINE_SIZE);
#ifdef IFLIB_DIAGNOSTICS
uint64_t ifr_cpu_exec_count[256];
#endif
} __aligned(CACHE_LINE_SIZE);
typedef struct if_rxsd {
caddr_t *ifsd_cl;
iflib_fl_t ifsd_fl;
} *if_rxsd_t;
/* multiple of word size */
#ifdef __LP64__
#define PKT_INFO_SIZE 6
#define RXD_INFO_SIZE 5
#define PKT_TYPE uint64_t
#else
#define PKT_INFO_SIZE 11
#define RXD_INFO_SIZE 8
#define PKT_TYPE uint32_t
#endif
#define PKT_LOOP_BOUND ((PKT_INFO_SIZE / 3) * 3)
#define RXD_LOOP_BOUND ((RXD_INFO_SIZE / 4) * 4)
typedef struct if_pkt_info_pad {
PKT_TYPE pkt_val[PKT_INFO_SIZE];
} *if_pkt_info_pad_t;
typedef struct if_rxd_info_pad {
PKT_TYPE rxd_val[RXD_INFO_SIZE];
} *if_rxd_info_pad_t;
CTASSERT(sizeof(struct if_pkt_info_pad) == sizeof(struct if_pkt_info));
CTASSERT(sizeof(struct if_rxd_info_pad) == sizeof(struct if_rxd_info));
static inline void
pkt_info_zero(if_pkt_info_t pi)
{
if_pkt_info_pad_t pi_pad;
pi_pad = (if_pkt_info_pad_t)pi;
pi_pad->pkt_val[0] = 0; pi_pad->pkt_val[1] = 0; pi_pad->pkt_val[2] = 0;
pi_pad->pkt_val[3] = 0; pi_pad->pkt_val[4] = 0; pi_pad->pkt_val[5] = 0;
#ifndef __LP64__
pi_pad->pkt_val[6] = 0; pi_pad->pkt_val[7] = 0; pi_pad->pkt_val[8] = 0;
pi_pad->pkt_val[9] = 0; pi_pad->pkt_val[10] = 0;
#endif
}
static inline void
rxd_info_zero(if_rxd_info_t ri)
{
if_rxd_info_pad_t ri_pad;
int i;
ri_pad = (if_rxd_info_pad_t)ri;
for (i = 0; i < RXD_LOOP_BOUND; i += 4) {
ri_pad->rxd_val[i] = 0;
ri_pad->rxd_val[i + 1] = 0;
ri_pad->rxd_val[i + 2] = 0;
ri_pad->rxd_val[i + 3] = 0;
}
#ifdef __LP64__
ri_pad->rxd_val[RXD_INFO_SIZE - 1] = 0;
#endif
}
/*
* Only allow a single packet to take up most 1/nth of the tx ring
*/
#define MAX_SINGLE_PACKET_FRACTION 12
#define IF_BAD_DMA ((bus_addr_t)-1)
#define CTX_ACTIVE(ctx) ((if_getdrvflags((ctx)->ifc_ifp) & IFF_DRV_RUNNING))
#define CTX_LOCK_INIT(_sc) sx_init(&(_sc)->ifc_ctx_sx, "iflib ctx lock")
#define CTX_LOCK(ctx) sx_xlock(&(ctx)->ifc_ctx_sx)
#define CTX_UNLOCK(ctx) sx_xunlock(&(ctx)->ifc_ctx_sx)
#define CTX_LOCK_DESTROY(ctx) sx_destroy(&(ctx)->ifc_ctx_sx)
#define STATE_LOCK_INIT(_sc, _name) mtx_init(&(_sc)->ifc_state_mtx, _name, "iflib state lock", MTX_DEF)
#define STATE_LOCK(ctx) mtx_lock(&(ctx)->ifc_state_mtx)
#define STATE_UNLOCK(ctx) mtx_unlock(&(ctx)->ifc_state_mtx)
#define STATE_LOCK_DESTROY(ctx) mtx_destroy(&(ctx)->ifc_state_mtx)
#define CALLOUT_LOCK(txq) mtx_lock(&txq->ift_mtx)
#define CALLOUT_UNLOCK(txq) mtx_unlock(&txq->ift_mtx)
/* Our boot-time initialization hook */
static int iflib_module_event_handler(module_t, int, void *);
static moduledata_t iflib_moduledata = {
"iflib",
iflib_module_event_handler,
NULL
};
DECLARE_MODULE(iflib, iflib_moduledata, SI_SUB_INIT_IF, SI_ORDER_ANY);
MODULE_VERSION(iflib, 1);
MODULE_DEPEND(iflib, pci, 1, 1, 1);
MODULE_DEPEND(iflib, ether, 1, 1, 1);
TASKQGROUP_DEFINE(if_io_tqg, mp_ncpus, 1);
TASKQGROUP_DEFINE(if_config_tqg, 1, 1);
#ifndef IFLIB_DEBUG_COUNTERS
#ifdef INVARIANTS
#define IFLIB_DEBUG_COUNTERS 1
#else
#define IFLIB_DEBUG_COUNTERS 0
#endif /* !INVARIANTS */
#endif
static SYSCTL_NODE(_net, OID_AUTO, iflib, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"iflib driver parameters");
/*
* XXX need to ensure that this can't accidentally cause the head to be moved backwards
*/
static int iflib_min_tx_latency = 0;
SYSCTL_INT(_net_iflib, OID_AUTO, min_tx_latency, CTLFLAG_RW,
&iflib_min_tx_latency, 0,
"minimize transmit latency at the possible expense of throughput");
static int iflib_no_tx_batch = 0;
SYSCTL_INT(_net_iflib, OID_AUTO, no_tx_batch, CTLFLAG_RW,
&iflib_no_tx_batch, 0,
"minimize transmit latency at the possible expense of throughput");
static int iflib_timer_default = 1000;
SYSCTL_INT(_net_iflib, OID_AUTO, timer_default, CTLFLAG_RW,
&iflib_timer_default, 0, "number of ticks between iflib_timer calls");
#if IFLIB_DEBUG_COUNTERS
static int iflib_tx_seen;
static int iflib_tx_sent;
static int iflib_tx_encap;
static int iflib_rx_allocs;
static int iflib_fl_refills;
static int iflib_fl_refills_large;
static int iflib_tx_frees;
SYSCTL_INT(_net_iflib, OID_AUTO, tx_seen, CTLFLAG_RD, &iflib_tx_seen, 0,
"# TX mbufs seen");
SYSCTL_INT(_net_iflib, OID_AUTO, tx_sent, CTLFLAG_RD, &iflib_tx_sent, 0,
"# TX mbufs sent");
SYSCTL_INT(_net_iflib, OID_AUTO, tx_encap, CTLFLAG_RD, &iflib_tx_encap, 0,
"# TX mbufs encapped");
SYSCTL_INT(_net_iflib, OID_AUTO, tx_frees, CTLFLAG_RD, &iflib_tx_frees, 0,
"# TX frees");
SYSCTL_INT(_net_iflib, OID_AUTO, rx_allocs, CTLFLAG_RD, &iflib_rx_allocs, 0,
"# RX allocations");
SYSCTL_INT(_net_iflib, OID_AUTO, fl_refills, CTLFLAG_RD, &iflib_fl_refills, 0,
"# refills");
SYSCTL_INT(_net_iflib, OID_AUTO, fl_refills_large, CTLFLAG_RD,
&iflib_fl_refills_large, 0, "# large refills");
static int iflib_txq_drain_flushing;
static int iflib_txq_drain_oactive;
static int iflib_txq_drain_notready;
SYSCTL_INT(_net_iflib, OID_AUTO, txq_drain_flushing, CTLFLAG_RD,
&iflib_txq_drain_flushing, 0, "# drain flushes");
SYSCTL_INT(_net_iflib, OID_AUTO, txq_drain_oactive, CTLFLAG_RD,
&iflib_txq_drain_oactive, 0, "# drain oactives");
SYSCTL_INT(_net_iflib, OID_AUTO, txq_drain_notready, CTLFLAG_RD,
&iflib_txq_drain_notready, 0, "# drain notready");
static int iflib_encap_load_mbuf_fail;
static int iflib_encap_pad_mbuf_fail;
static int iflib_encap_txq_avail_fail;
static int iflib_encap_txd_encap_fail;
SYSCTL_INT(_net_iflib, OID_AUTO, encap_load_mbuf_fail, CTLFLAG_RD,
&iflib_encap_load_mbuf_fail, 0, "# busdma load failures");
SYSCTL_INT(_net_iflib, OID_AUTO, encap_pad_mbuf_fail, CTLFLAG_RD,
&iflib_encap_pad_mbuf_fail, 0, "# runt frame pad failures");
SYSCTL_INT(_net_iflib, OID_AUTO, encap_txq_avail_fail, CTLFLAG_RD,
&iflib_encap_txq_avail_fail, 0, "# txq avail failures");
SYSCTL_INT(_net_iflib, OID_AUTO, encap_txd_encap_fail, CTLFLAG_RD,
&iflib_encap_txd_encap_fail, 0, "# driver encap failures");
static int iflib_task_fn_rxs;
static int iflib_rx_intr_enables;
static int iflib_fast_intrs;
static int iflib_rx_unavail;
static int iflib_rx_ctx_inactive;
static int iflib_rx_if_input;
static int iflib_rxd_flush;
static int iflib_verbose_debug;
SYSCTL_INT(_net_iflib, OID_AUTO, task_fn_rx, CTLFLAG_RD, &iflib_task_fn_rxs, 0,
"# task_fn_rx calls");
SYSCTL_INT(_net_iflib, OID_AUTO, rx_intr_enables, CTLFLAG_RD,
&iflib_rx_intr_enables, 0, "# RX intr enables");
SYSCTL_INT(_net_iflib, OID_AUTO, fast_intrs, CTLFLAG_RD, &iflib_fast_intrs, 0,
"# fast_intr calls");
SYSCTL_INT(_net_iflib, OID_AUTO, rx_unavail, CTLFLAG_RD, &iflib_rx_unavail, 0,
"# times rxeof called with no available data");
SYSCTL_INT(_net_iflib, OID_AUTO, rx_ctx_inactive, CTLFLAG_RD,
&iflib_rx_ctx_inactive, 0, "# times rxeof called with inactive context");
SYSCTL_INT(_net_iflib, OID_AUTO, rx_if_input, CTLFLAG_RD, &iflib_rx_if_input,
0, "# times rxeof called if_input");
SYSCTL_INT(_net_iflib, OID_AUTO, rxd_flush, CTLFLAG_RD, &iflib_rxd_flush, 0,
"# times rxd_flush called");
SYSCTL_INT(_net_iflib, OID_AUTO, verbose_debug, CTLFLAG_RW,
&iflib_verbose_debug, 0, "enable verbose debugging");
#define DBG_COUNTER_INC(name) atomic_add_int(&(iflib_ ## name), 1)
static void
iflib_debug_reset(void)
{
iflib_tx_seen = iflib_tx_sent = iflib_tx_encap = iflib_rx_allocs =
iflib_fl_refills = iflib_fl_refills_large = iflib_tx_frees =
iflib_txq_drain_flushing = iflib_txq_drain_oactive =
iflib_txq_drain_notready =
iflib_encap_load_mbuf_fail = iflib_encap_pad_mbuf_fail =
iflib_encap_txq_avail_fail = iflib_encap_txd_encap_fail =
iflib_task_fn_rxs = iflib_rx_intr_enables = iflib_fast_intrs =
iflib_rx_unavail =
iflib_rx_ctx_inactive = iflib_rx_if_input =
iflib_rxd_flush = 0;
}
#else
#define DBG_COUNTER_INC(name)
static void iflib_debug_reset(void) {}
#endif
#define IFLIB_DEBUG 0
static void iflib_tx_structures_free(if_ctx_t ctx);
static void iflib_rx_structures_free(if_ctx_t ctx);
static int iflib_queues_alloc(if_ctx_t ctx);
static int iflib_tx_credits_update(if_ctx_t ctx, iflib_txq_t txq);
static int iflib_rxd_avail(if_ctx_t ctx, iflib_rxq_t rxq, qidx_t cidx, qidx_t budget);
static int iflib_qset_structures_setup(if_ctx_t ctx);
static int iflib_msix_init(if_ctx_t ctx);
static int iflib_legacy_setup(if_ctx_t ctx, driver_filter_t filter, void *filterarg, int *rid, const char *str);
static void iflib_txq_check_drain(iflib_txq_t txq, int budget);
static uint32_t iflib_txq_can_drain(struct ifmp_ring *);
#ifdef ALTQ
static void iflib_altq_if_start(if_t ifp);
static int iflib_altq_if_transmit(if_t ifp, struct mbuf *m);
#endif
static int iflib_register(if_ctx_t);
static void iflib_deregister(if_ctx_t);
static void iflib_unregister_vlan_handlers(if_ctx_t ctx);
static uint16_t iflib_get_mbuf_size_for(unsigned int size);
static void iflib_init_locked(if_ctx_t ctx);
static void iflib_add_device_sysctl_pre(if_ctx_t ctx);
static void iflib_add_device_sysctl_post(if_ctx_t ctx);
static void iflib_ifmp_purge(iflib_txq_t txq);
static void _iflib_pre_assert(if_softc_ctx_t scctx);
static void iflib_stop(if_ctx_t ctx);
static void iflib_if_init_locked(if_ctx_t ctx);
static void iflib_free_intr_mem(if_ctx_t ctx);
#ifndef __NO_STRICT_ALIGNMENT
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;
unsigned int refcount;
uint16_t next_cpuid;
};
static struct mtx cpu_offset_mtx;
MTX_SYSINIT(iflib_cpu_offset, &cpu_offset_mtx, "iflib_cpu_offset lock",
MTX_DEF);
DEBUGNET_DEFINE(iflib);
static int
iflib_num_rx_descs(if_ctx_t ctx)
{
if_softc_ctx_t scctx = &ctx->ifc_softc_ctx;
if_shared_ctx_t sctx = ctx->ifc_sctx;
uint16_t first_rxq = (sctx->isc_flags & IFLIB_HAS_RXCQ) ? 1 : 0;
return (scctx->isc_nrxd[first_rxq]);
}
static int
iflib_num_tx_descs(if_ctx_t ctx)
{
if_softc_ctx_t scctx = &ctx->ifc_softc_ctx;
if_shared_ctx_t sctx = ctx->ifc_sctx;
uint16_t first_txq = (sctx->isc_flags & IFLIB_HAS_TXCQ) ? 1 : 0;
return (scctx->isc_ntxd[first_txq]);
}
#ifdef DEV_NETMAP
#include <sys/selinfo.h>
#include <net/netmap.h>
#include <dev/netmap/netmap_kern.h>
MODULE_DEPEND(iflib, netmap, 1, 1, 1);
static int netmap_fl_refill(iflib_rxq_t rxq, struct netmap_kring *kring, bool init);
static void iflib_netmap_timer(void *arg);
/*
* device-specific sysctl variables:
*
* iflib_crcstrip: 0: keep CRC in rx frames (default), 1: strip it.
* During regular operations the CRC is stripped, but on some
* hardware reception of frames not multiple of 64 is slower,
* so using crcstrip=0 helps in benchmarks.
*
* iflib_rx_miss, iflib_rx_miss_bufs:
* count packets that might be missed due to lost interrupts.
*/
SYSCTL_DECL(_dev_netmap);
/*
* The xl driver by default strips CRCs and we do not override it.
*/
int iflib_crcstrip = 1;
SYSCTL_INT(_dev_netmap, OID_AUTO, iflib_crcstrip,
CTLFLAG_RW, &iflib_crcstrip, 1, "strip CRC on RX frames");
int iflib_rx_miss, iflib_rx_miss_bufs;
SYSCTL_INT(_dev_netmap, OID_AUTO, iflib_rx_miss,
CTLFLAG_RW, &iflib_rx_miss, 0, "potentially missed RX intr");
SYSCTL_INT(_dev_netmap, OID_AUTO, iflib_rx_miss_bufs,
CTLFLAG_RW, &iflib_rx_miss_bufs, 0, "potentially missed RX intr bufs");
/*
* Register/unregister. We are already under netmap lock.
* Only called on the first register or the last unregister.
*/
static int
iflib_netmap_register(struct netmap_adapter *na, int onoff)
{
if_t ifp = na->ifp;
if_ctx_t ctx = if_getsoftc(ifp);
int status;
CTX_LOCK(ctx);
if (!CTX_IS_VF(ctx))
IFDI_CRCSTRIP_SET(ctx, onoff, iflib_crcstrip);
iflib_stop(ctx);
/*
* Enable (or disable) netmap flags, and intercept (or restore)
* ifp->if_transmit. This is done once the device has been stopped
* to prevent race conditions. Also, this must be done after
* calling netmap_disable_all_rings() and before calling
* netmap_enable_all_rings(), so that these two functions see the
* updated state of the NAF_NETMAP_ON bit.
*/
if (onoff) {
nm_set_native_flags(na);
} else {
nm_clear_native_flags(na);
}
iflib_init_locked(ctx);
IFDI_CRCSTRIP_SET(ctx, onoff, iflib_crcstrip); // XXX why twice ?
status = if_getdrvflags(ifp) & IFF_DRV_RUNNING ? 0 : 1;
if (status)
nm_clear_native_flags(na);
CTX_UNLOCK(ctx);
return (status);
}
static int
iflib_netmap_config(struct netmap_adapter *na, struct nm_config_info *info)
{
if_t ifp = na->ifp;
if_ctx_t ctx = if_getsoftc(ifp);
iflib_rxq_t rxq = &ctx->ifc_rxqs[0];
iflib_fl_t fl = &rxq->ifr_fl[0];
info->num_tx_rings = ctx->ifc_softc_ctx.isc_ntxqsets;
info->num_rx_rings = ctx->ifc_softc_ctx.isc_nrxqsets;
info->num_tx_descs = iflib_num_tx_descs(ctx);
info->num_rx_descs = iflib_num_rx_descs(ctx);
info->rx_buf_maxsize = fl->ifl_buf_size;
nm_prinf("txr %u rxr %u txd %u rxd %u rbufsz %u",
info->num_tx_rings, info->num_rx_rings, info->num_tx_descs,
info->num_rx_descs, info->rx_buf_maxsize);
return (0);
}
static int
netmap_fl_refill(iflib_rxq_t rxq, struct netmap_kring *kring, bool init)
{
struct netmap_adapter *na = kring->na;
u_int const lim = kring->nkr_num_slots - 1;
struct netmap_ring *ring = kring->ring;
bus_dmamap_t *map;
struct if_rxd_update iru;
if_ctx_t ctx = rxq->ifr_ctx;
iflib_fl_t fl = &rxq->ifr_fl[0];
u_int nic_i_first, nic_i;
u_int nm_i;
int i, n;
#if IFLIB_DEBUG_COUNTERS
int rf_count = 0;
#endif
/*
* This function is used both at initialization and in rxsync.
* At initialization we need to prepare (with isc_rxd_refill())
* all the netmap buffers currently owned by the kernel, in
* such a way to keep fl->ifl_pidx and kring->nr_hwcur in sync
* (except for kring->nkr_hwofs). These may be less than
* kring->nkr_num_slots if netmap_reset() was called while
* an application using the kring that still owned some
* buffers.
* At rxsync time, both indexes point to the next buffer to be
* refilled.
* In any case we publish (with isc_rxd_flush()) up to
* (fl->ifl_pidx - 1) % N (included), to avoid the NIC tail/prod
* pointer to overrun the head/cons pointer, although this is
* not necessary for some NICs (e.g. vmx).
*/
if (__predict_false(init)) {
n = kring->nkr_num_slots - nm_kr_rxspace(kring);
} else {
n = kring->rhead - kring->nr_hwcur;
if (n == 0)
return (0); /* Nothing to do. */
if (n < 0)
n += kring->nkr_num_slots;
}
iru_init(&iru, rxq, 0 /* flid */);
map = fl->ifl_sds.ifsd_map;
nic_i = fl->ifl_pidx;
nm_i = netmap_idx_n2k(kring, nic_i);
if (__predict_false(init)) {
/*
* On init/reset, nic_i must be 0, and we must
* start to refill from hwtail (see netmap_reset()).
*/
MPASS(nic_i == 0);
MPASS(nm_i == kring->nr_hwtail);
} else
MPASS(nm_i == kring->nr_hwcur);
DBG_COUNTER_INC(fl_refills);
while (n > 0) {
#if IFLIB_DEBUG_COUNTERS
if (++rf_count == 9)
DBG_COUNTER_INC(fl_refills_large);
#endif
nic_i_first = nic_i;
for (i = 0; n > 0 && i < IFLIB_MAX_RX_REFRESH; n--, i++) {
struct netmap_slot *slot = &ring->slot[nm_i];
uint64_t paddr;
void *addr = PNMB(na, slot, &paddr);
MPASS(i < IFLIB_MAX_RX_REFRESH);
if (addr == NETMAP_BUF_BASE(na)) /* bad buf */
return (netmap_ring_reinit(kring));
fl->ifl_bus_addrs[i] = paddr +
nm_get_offset(kring, slot);
fl->ifl_rxd_idxs[i] = nic_i;
if (__predict_false(init)) {
netmap_load_map(na, fl->ifl_buf_tag,
map[nic_i], addr);
} else if (slot->flags & NS_BUF_CHANGED) {
/* buffer has changed, reload map */
netmap_reload_map(na, fl->ifl_buf_tag,
map[nic_i], addr);
}
bus_dmamap_sync(fl->ifl_buf_tag, map[nic_i],
BUS_DMASYNC_PREREAD);
slot->flags &= ~NS_BUF_CHANGED;
nm_i = nm_next(nm_i, lim);
nic_i = nm_next(nic_i, lim);
}
iru.iru_pidx = nic_i_first;
iru.iru_count = i;
ctx->isc_rxd_refill(ctx->ifc_softc, &iru);
}
fl->ifl_pidx = nic_i;
/*
* At the end of the loop we must have refilled everything
* we could possibly refill.
*/
MPASS(nm_i == kring->rhead);
kring->nr_hwcur = nm_i;
bus_dmamap_sync(fl->ifl_ifdi->idi_tag, fl->ifl_ifdi->idi_map,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
ctx->isc_rxd_flush(ctx->ifc_softc, rxq->ifr_id, fl->ifl_id,
nm_prev(nic_i, lim));
DBG_COUNTER_INC(rxd_flush);
return (0);
}
#define NETMAP_TX_TIMER_US 90
/*
* Reconcile kernel and user view of the transmit ring.
*
* All information is in the kring.
* Userspace wants to send packets up to the one before kring->rhead,
* kernel knows kring->nr_hwcur is the first unsent packet.
*
* Here we push packets out (as many as possible), and possibly
* reclaim buffers from previously completed transmission.
*
* The caller (netmap) guarantees that there is only one instance
* running at any time. Any interference with other driver
* methods should be handled by the individual drivers.
*/
static int
iflib_netmap_txsync(struct netmap_kring *kring, int flags)
{
struct netmap_adapter *na = kring->na;
if_t ifp = na->ifp;
struct netmap_ring *ring = kring->ring;
u_int nm_i; /* index into the netmap kring */
u_int nic_i; /* index into the NIC ring */
u_int const lim = kring->nkr_num_slots - 1;
u_int const head = kring->rhead;
struct if_pkt_info pi;
int tx_pkts = 0, tx_bytes = 0;