From 5bacc3bb87b954978543b0d82a4d5705e33f5c06 Mon Sep 17 00:00:00 2001 From: luigi Date: Tue, 18 Feb 2014 05:01:04 +0000 Subject: MFH: sync the netmap code with the one in HEAD (enhanced VALE switch, netmap pipes, emulated netmap mode). See details in the log for svn 261909. --- sys/net/netmap.h | 651 ++++++++++++++++++++++++++++++++----------------- sys/net/netmap_user.h | 658 +++++++++++++++++++++++++++++++++++++++++++++++--- 2 files changed, 1045 insertions(+), 264 deletions(-) (limited to 'sys/net') diff --git a/sys/net/netmap.h b/sys/net/netmap.h index b5ab6d5..f0b4c56 100644 --- a/sys/net/netmap.h +++ b/sys/net/netmap.h @@ -1,33 +1,27 @@ /* - * Copyright (C) 2011-2013 Matteo Landi, Luigi Rizzo. All rights reserved. - * + * Copyright (C) 2011-2014 Matteo Landi, Luigi Rizzo. All rights reserved. + * * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * + * 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. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the - * distribution. - * - * 3. Neither the name of the authors nor the names of their contributors - * may be used to endorse or promote products derived from this - * software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY MATTEO LANDI AND CONTRIBUTORS "AS IS" AND + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``S 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 MATTEO LANDI 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. + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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. */ /* @@ -36,215 +30,249 @@ * Definitions of constants and the structures used by the netmap * framework, for the part visible to both kernel and userspace. * Detailed info on netmap is available with "man netmap" or at - * + * * http://info.iet.unipi.it/~luigi/netmap/ + * + * This API is also used to communicate with the VALE software switch */ #ifndef _NET_NETMAP_H_ #define _NET_NETMAP_H_ +#define NETMAP_API 11 /* current API version */ + +#define NETMAP_MIN_API 11 /* min and max versions accepted */ +#define NETMAP_MAX_API 15 +/* + * Some fields should be cache-aligned to reduce contention. + * The alignment is architecture and OS dependent, but rather than + * digging into OS headers to find the exact value we use an estimate + * that should cover most architectures. + */ +#define NM_CACHE_ALIGN 128 + /* * --- Netmap data structures --- * - * The data structures used by netmap are shown below. Those in - * capital letters are in an mmapp()ed area shared with userspace, - * while others are private to the kernel. - * Shared structures do not contain pointers but only memory - * offsets, so that addressing is portable between kernel and userspace. - - - softc -+----------------+ -| standard fields| -| if_pspare[0] ----------+ -+----------------+ | - | -+----------------+<------+ -|(netmap_adapter)| -| | netmap_kring -| tx_rings *--------------------------------->+---------------+ -| | netmap_kring | ring *---------. -| rx_rings *--------->+---------------+ | nr_hwcur | | -+----------------+ | ring *--------. | nr_hwavail | V - | nr_hwcur | | | selinfo | | - | nr_hwavail | | +---------------+ . - | selinfo | | | ... | . - +---------------+ | |(ntx+1 entries)| - | .... | | | | - |(nrx+1 entries)| | +---------------+ - | | | - KERNEL +---------------+ | - | + * The userspace data structures used by netmap are shown below. + * They are allocated by the kernel and mmap()ed by userspace threads. + * Pointers are implemented as memory offsets or indexes, + * so that they can be easily dereferenced in kernel and userspace. + + KERNEL (opaque, obviously) + ==================================================================== | - USERSPACE | NETMAP_RING - +---->+-------------+ - / | cur | - NETMAP_IF (nifp, one per file desc.) / | avail | - +---------------+ / | buf_ofs | - | ni_tx_rings | / +=============+ - | ni_rx_rings | / | buf_idx | slot[0] - | | / | len, flags | - | | / +-------------+ - +===============+ / | buf_idx | slot[1] - | txring_ofs[0] | (rel.to nifp)--' | len, flags | - | txring_ofs[1] | +-------------+ - (num_rings+1 entries) (nr_num_slots entries) - | txring_ofs[n] | | buf_idx | slot[n-1] - +---------------+ | len, flags | - | rxring_ofs[0] | +-------------+ + USERSPACE | struct netmap_ring + +---->+---------------+ + / | head,cur,tail | + struct netmap_if (nifp, 1 per fd) / | buf_ofs | + +---------------+ / | other fields | + | ni_tx_rings | / +===============+ + | ni_rx_rings | / | buf_idx, len | slot[0] + | | / | flags, ptr | + | | / +---------------+ + +===============+ / | buf_idx, len | slot[1] + | txring_ofs[0] | (rel.to nifp)--' | flags, ptr | + | txring_ofs[1] | +---------------+ + (tx+1 entries) (num_slots entries) + | txring_ofs[t] | | buf_idx, len | slot[n-1] + +---------------+ | flags, ptr | + | rxring_ofs[0] | +---------------+ | rxring_ofs[1] | - (num_rings+1 entries) - | txring_ofs[n] | + (rx+1 entries) + | rxring_ofs[r] | +---------------+ - * The private descriptor ('softc' or 'adapter') of each interface - * is extended with a "struct netmap_adapter" containing netmap-related - * info (see description in dev/netmap/netmap_kernel.h. - * Among other things, tx_rings and rx_rings point to the arrays of - * "struct netmap_kring" which in turn reache the various - * "struct netmap_ring", shared with userspace. - - * The NETMAP_RING is the userspace-visible replica of the NIC ring. - * Each slot has the index of a buffer, its length and some flags. + * For each "interface" (NIC, host stack, PIPE, VALE switch port) bound to + * a file descriptor, the mmap()ed region contains a (logically readonly) + * struct netmap_if pointing to struct netmap_ring's. + * + * There is one netmap_ring per physical NIC ring, plus one tx/rx ring + * pair attached to the host stack (this pair is unused for non-NIC ports). + * + * All physical/host stack ports share the same memory region, + * so that zero-copy can be implemented between them. + * VALE switch ports instead have separate memory regions. + * + * The netmap_ring is the userspace-visible replica of the NIC ring. + * Each slot has the index of a buffer (MTU-sized and residing in the + * mmapped region), its length and some flags. An extra 64-bit pointer + * is provided for user-supplied buffers in the tx path. + * * In user space, the buffer address is computed as - * (char *)ring + buf_ofs + index*NETMAP_BUF_SIZE - * In the kernel, buffers do not necessarily need to be contiguous, - * and the virtual and physical addresses are derived through - * a lookup table. - * - * struct netmap_slot: - * - * buf_idx is the index of the buffer associated to the slot. - * len is the length of the payload - * NS_BUF_CHANGED must be set whenever userspace wants - * to change buf_idx (it might be necessary to - * reprogram the NIC slot) - * NS_REPORT must be set if we want the NIC to generate an interrupt - * when this slot is used. Leaving it to 0 improves - * performance. - * NS_FORWARD if set on a receive ring, and the device is in - * transparent mode, buffers released with the flag set - * will be forwarded to the 'other' side (host stack - * or NIC, respectively) on the next select() or ioctl() - * - * The following will be supported from NETMAP_API = 5 - * NS_NO_LEARN on a VALE switch, do not 'learn' the source port for - * this packet. - * NS_INDIRECT the netmap buffer contains a 64-bit pointer to - * the actual userspace buffer. This may be useful - * to reduce copies in a VM environment. - * NS_MOREFRAG Part of a multi-segment frame. The last (or only) - * segment must not have this flag. - * NS_PORT_MASK the high 8 bits of the flag, if not zero, indicate the - * destination port for the VALE switch, overriding - * the lookup table. + * (char *)ring + buf_ofs + index * NETMAP_BUF_SIZE + * + * Added in NETMAP_API 11: + * + * + NIOCREGIF can request the allocation of extra spare buffers from + * the same memory pool. The desired number of buffers must be in + * nr_arg3. The ioctl may return fewer buffers, depending on memory + * availability. nr_arg3 will return the actual value, and, once + * mapped, nifp->ni_bufs_head will be the index of the first buffer. + * + * The buffers are linked to each other using the first uint32_t + * as the index. On close, ni_bufs_head must point to the list of + * buffers to be released. + * + * + NIOCREGIF can request space for extra rings (and buffers) + * allocated in the same memory space. The number of extra rings + * is in nr_arg1, and is advisory. This is a no-op on NICs where + * the size of the memory space is fixed. + * + * + NIOCREGIF can attach to PIPE rings sharing the same memory + * space with a parent device. The ifname indicates the parent device, + * which must already exist. Flags in nr_flags indicate if we want to + * bind the master or slave side, the index (from nr_ringid) + * is just a cookie and does need to be sequential. + * + * + NIOCREGIF can also attach to 'monitor' rings that replicate + * the content of specific rings, also from the same memory space. + * + * Extra flags in nr_flags support the above functions. + * Application libraries may use the following naming scheme: + * netmap:foo all NIC ring pairs + * netmap:foo^ only host ring pair + * netmap:foo+ all NIC ring + host ring pairs + * netmap:foo-k the k-th NIC ring pair + * netmap:foo{k PIPE ring pair k, master side + * netmap:foo}k PIPE ring pair k, slave side */ +/* + * struct netmap_slot is a buffer descriptor + */ struct netmap_slot { - uint32_t buf_idx; /* buffer index */ - uint16_t len; /* packet length, to be copied to/from the hw ring */ - uint16_t flags; /* buf changed, etc. */ -#define NS_BUF_CHANGED 0x0001 /* must resync the map, buffer changed */ -#define NS_REPORT 0x0002 /* ask the hardware to report results - * e.g. by generating an interrupt - */ -#define NS_FORWARD 0x0004 /* pass packet to the other endpoint - * (host stack or device) - */ -#define NS_NO_LEARN 0x0008 -#define NS_INDIRECT 0x0010 -#define NS_MOREFRAG 0x0020 + uint32_t buf_idx; /* buffer index */ + uint16_t len; /* length for this slot */ + uint16_t flags; /* buf changed, etc. */ + uint64_t ptr; /* pointer for indirect buffers */ +}; + +/* + * The following flags control how the slot is used + */ + +#define NS_BUF_CHANGED 0x0001 /* buf_idx changed */ + /* + * must be set whenever buf_idx is changed (as it might be + * necessary to recompute the physical address and mapping) + */ + +#define NS_REPORT 0x0002 /* ask the hardware to report results */ + /* + * Request notification when slot is used by the hardware. + * Normally transmit completions are handled lazily and + * may be unreported. This flag lets us know when a slot + * has been sent (e.g. to terminate the sender). + */ + +#define NS_FORWARD 0x0004 /* pass packet 'forward' */ + /* + * (Only for physical ports, rx rings with NR_FORWARD set). + * Slot released to the kernel (i.e. before ring->head) with + * this flag set are passed to the peer ring (host/NIC), + * thus restoring the host-NIC connection for these slots. + * This supports efficient traffic monitoring or firewalling. + */ + +#define NS_NO_LEARN 0x0008 /* disable bridge learning */ + /* + * On a VALE switch, do not 'learn' the source port for + * this buffer. + */ + +#define NS_INDIRECT 0x0010 /* userspace buffer */ + /* + * (VALE tx rings only) data is in a userspace buffer, + * whose address is in the 'ptr' field in the slot. + */ + +#define NS_MOREFRAG 0x0020 /* packet has more fragments */ + /* + * (VALE ports only) + * Set on all but the last slot of a multi-segment packet. + * The 'len' field refers to the individual fragment. + */ + #define NS_PORT_SHIFT 8 #define NS_PORT_MASK (0xff << NS_PORT_SHIFT) -}; + /* + * The high 8 bits of the flag, if not zero, indicate the + * destination port for the VALE switch, overriding + * the lookup table. + */ + +#define NS_RFRAGS(_slot) ( ((_slot)->flags >> 8) & 0xff) + /* + * (VALE rx rings only) the high 8 bits + * are the number of fragments. + */ + /* + * struct netmap_ring + * * Netmap representation of a TX or RX ring (also known as "queue"). * This is a queue implemented as a fixed-size circular array. - * At the software level, two fields are important: avail and cur. + * At the software level the important fields are: head, cur, tail. * * In TX rings: - * avail indicates the number of slots available for transmission. - * It is updated by the kernel after every netmap system call. - * It MUST BE decremented by the application when it appends a - * packet. - * cur indicates the slot to use for the next packet - * to send (i.e. the "tail" of the queue). - * It MUST BE incremented by the application before - * netmap system calls to reflect the number of newly - * sent packets. - * It is checked by the kernel on netmap system calls - * (normally unmodified by the kernel unless invalid). - * - * The kernel side of netmap uses two additional fields in its own - * private ring structure, netmap_kring: - * nr_hwcur is a copy of nr_cur on an NIOCTXSYNC. - * nr_hwavail is the number of slots known as available by the - * hardware. It is updated on an INTR (inc by the - * number of packets sent) and on a NIOCTXSYNC - * (decrease by nr_cur - nr_hwcur) - * A special case, nr_hwavail is -1 if the transmit - * side is idle (no pending transmits). + * + * head first slot available for transmission. + * cur wakeup point. select() and poll() will unblock + * when 'tail' moves past 'cur' + * tail (readonly) first slot reserved to the kernel + * + * [head .. tail-1] can be used for new packets to send; + * 'head' and 'cur' must be incremented as slots are filled + * with new packets to be sent; + * 'cur' can be moved further ahead if we need more space + * for new transmissions. * * In RX rings: - * avail is the number of packets available (possibly 0). - * It MUST BE decremented by the application when it consumes - * a packet, and it is updated to nr_hwavail on a NIOCRXSYNC - * cur indicates the first slot that contains a packet not - * processed yet (the "head" of the queue). - * It MUST BE incremented by the software when it consumes - * a packet. - * reserved indicates the number of buffers before 'cur' - * that the application has still in use. Normally 0, - * it MUST BE incremented by the application when it - * does not return the buffer immediately, and decremented - * when the buffer is finally freed. - * - * The kernel side of netmap uses two additional fields in the kring: - * nr_hwcur is a copy of nr_cur on an NIOCRXSYNC - * nr_hwavail is the number of packets available. It is updated - * on INTR (inc by the number of new packets arrived) - * and on NIOCRXSYNC (decreased by nr_cur - nr_hwcur). + * + * head first valid received packet + * cur wakeup point. select() and poll() will unblock + * when 'tail' moves past 'cur' + * tail (readonly) first slot reserved to the kernel + * + * [head .. tail-1] contain received packets; + * 'head' and 'cur' must be incremented as slots are consumed + * and can be returned to the kernel; + * 'cur' can be moved further ahead if we want to wait for + * new packets without returning the previous ones. * * DATA OWNERSHIP/LOCKING: - * The netmap_ring is owned by the user program and it is only - * accessed or modified in the upper half of the kernel during - * a system call. - * - * The netmap_kring is only modified by the upper half of the kernel. - * - * FLAGS - * NR_TIMESTAMP updates the 'ts' field on each syscall. This is - * a global timestamp for all packets. - * NR_RX_TSTMP if set, the last 64 byte in each buffer will - * contain a timestamp for the frame supplied by - * the hardware (if supported) - * NR_FORWARD if set, the NS_FORWARD flag in each slot of the - * RX ring is checked, and if set the packet is - * passed to the other side (host stack or device, - * respectively). This permits bpf-like behaviour - * or transparency for selected packets. + * The netmap_ring, and all slots and buffers in the range + * [head .. tail-1] are owned by the user program; + * the kernel only accesses them during a netmap system call + * and in the user thread context. + * + * Other slots and buffers are reserved for use by the kernel */ struct netmap_ring { /* - * nr_buf_base_ofs is meant to be used through macros. + * buf_ofs is meant to be used through macros. * It contains the offset of the buffer region from this * descriptor. */ - const ssize_t buf_ofs; + const int64_t buf_ofs; const uint32_t num_slots; /* number of slots in the ring. */ - uint32_t avail; /* number of usable slots */ - uint32_t cur; /* 'current' r/w position */ - uint32_t reserved; /* not refilled before current */ + const uint32_t nr_buf_size; + const uint16_t ringid; + const uint16_t dir; /* 0: tx, 1: rx */ - const uint16_t nr_buf_size; - uint16_t flags; -#define NR_TIMESTAMP 0x0002 /* set timestamp on *sync() */ -#define NR_FORWARD 0x0004 /* enable NS_FORWARD for ring */ -#define NR_RX_TSTMP 0x0008 /* set rx timestamp in slots */ + uint32_t head; /* (u) first user slot */ + uint32_t cur; /* (u) wakeup point */ + uint32_t tail; /* (k) first kernel slot */ + + uint32_t flags; - struct timeval ts; /* time of last *sync() */ + struct timeval ts; /* (k) time of last *sync() */ + + /* opaque room for a mutex or similar object */ + uint8_t sem[128] __attribute__((__aligned__(NM_CACHE_ALIGN))); /* the slots follow. This struct has variable size */ struct netmap_slot slot[0]; /* array of slots. */ @@ -252,88 +280,246 @@ struct netmap_ring { /* + * RING FLAGS + */ +#define NR_TIMESTAMP 0x0002 /* set timestamp on *sync() */ + /* + * updates the 'ts' field on each netmap syscall. This saves + * saves a separate gettimeofday(), and is not much worse than + * software timestamps generated in the interrupt handler. + */ + +#define NR_FORWARD 0x0004 /* enable NS_FORWARD for ring */ + /* + * Enables the NS_FORWARD slot flag for the ring. + */ + + +/* * Netmap representation of an interface and its queue(s). + * This is initialized by the kernel when binding a file + * descriptor to a port, and should be considered as readonly + * by user programs. The kernel never uses it. + * * There is one netmap_if for each file descriptor on which we want - * to select/poll. We assume that on each interface has the same number - * of receive and transmit queues. + * to select/poll. * select/poll operates on one or all pairs depending on the value of * nmr_queueid passed on the ioctl. */ struct netmap_if { char ni_name[IFNAMSIZ]; /* name of the interface. */ - const u_int ni_version; /* API version, currently unused */ - const u_int ni_rx_rings; /* number of rx rings */ - const u_int ni_tx_rings; /* if zero, same as ni_rx_rings */ + const uint32_t ni_version; /* API version, currently unused */ + const uint32_t ni_flags; /* properties */ +#define NI_PRIV_MEM 0x1 /* private memory region */ + + /* + * The number of packet rings available in netmap mode. + * Physical NICs can have different numbers of tx and rx rings. + * Physical NICs also have a 'host' ring pair. + * Additionally, clients can request additional ring pairs to + * be used for internal communication. + */ + const uint32_t ni_tx_rings; /* number of HW tx rings */ + const uint32_t ni_rx_rings; /* number of HW rx rings */ + + uint32_t ni_bufs_head; /* head index for extra bufs */ + uint32_t ni_spare1[5]; /* * The following array contains the offset of each netmap ring - * from this structure. The first ni_tx_queues+1 entries refer - * to the tx rings, the next ni_rx_queues+1 refer to the rx rings - * (the last entry in each block refers to the host stack rings). - * The area is filled up by the kernel on NIOCREG, + * from this structure, in the following order: + * NIC tx rings (ni_tx_rings); host tx ring (1); extra tx rings; + * NIC rx rings (ni_rx_rings); host tx ring (1); extra rx rings. + * + * The area is filled up by the kernel on NIOCREGIF, * and then only read by userspace code. */ const ssize_t ring_ofs[0]; }; -#ifndef NIOCREGIF + +#ifndef NIOCREGIF /* * ioctl names and related fields * + * NIOCTXSYNC, NIOCRXSYNC synchronize tx or rx queues, + * whose identity is set in NIOCREGIF through nr_ringid. + * These are non blocking and take no argument. + * * NIOCGINFO takes a struct ifreq, the interface name is the input, * the outputs are number of queues and number of descriptor * for each queue (useful to set number of threads etc.). + * The info returned is only advisory and may change before + * the interface is bound to a file descriptor. * - * NIOCREGIF takes an interface name within a struct ifreq, + * NIOCREGIF takes an interface name within a struct nmre, * and activates netmap mode on the interface (if possible). * - * For vale ports, starting with NETMAP_API = 5, - * nr_tx_rings and nr_rx_rings specify how many software rings - * are created (0 means 1). + * The argument to NIOCGINFO/NIOCREGIF overlays struct ifreq so we + * can pass it down to other NIC-related ioctls. * - * NIOCREGIF is also used to attach a NIC to a VALE switch. - * In this case the name is vale*:ifname, and "nr_cmd" - * is set to 'NETMAP_BDG_ATTACH' or 'NETMAP_BDG_DETACH'. - * nr_ringid specifies which rings should be attached, 0 means all, - * NETMAP_HW_RING + n means only the n-th ring. - * The process can terminate after the interface has been attached. + * The actual argument (struct nmreq) has a number of options to request + * different functions. + * The following are used in NIOCREGIF when nr_cmd == 0: * - * NIOCUNREGIF unregisters the interface associated to the fd. - * this is deprecated and will go away. + * nr_name (in) + * The name of the port (em0, valeXXX:YYY, etc.) + * limited to IFNAMSIZ for backward compatibility. * - * NIOCTXSYNC, NIOCRXSYNC synchronize tx or rx queues, - * whose identity is set in NIOCREGIF through nr_ringid + * nr_version (in/out) + * Must match NETMAP_API as used in the kernel, error otherwise. + * Always returns the desired value on output. + * + * nr_tx_slots, nr_tx_slots, nr_tx_rings, nr_rx_rings (in/out) + * On input, non-zero values may be used to reconfigure the port + * according to the requested values, but this is not guaranteed. + * On output the actual values in use are reported. + * + * nr_ringid (in) + * Indicates how rings should be bound to the file descriptors. + * If nr_flags != 0, then the low bits (in NETMAP_RING_MASK) + * are used to indicate the ring number, and nr_flags specifies + * the actual rings to bind. NETMAP_NO_TX_POLL is unaffected. + * + * NOTE: THE FOLLOWING (nr_flags == 0) IS DEPRECATED: + * If nr_flags == 0, NETMAP_HW_RING and NETMAP_SW_RING control + * the binding as follows: + * 0 (default) binds all physical rings + * NETMAP_HW_RING | ring number binds a single ring pair + * NETMAP_SW_RING binds only the host tx/rx rings + * + * NETMAP_NO_TX_POLL can be OR-ed to make select()/poll() push + * packets on tx rings only if POLLOUT is set. + * The default is to push any pending packet. + * + * NETMAP_DO_RX_POLL can be OR-ed to make select()/poll() release + * packets on rx rings also when POLLIN is NOT set. + * The default is to touch the rx ring only with POLLIN. + * Note that this is the opposite of TX because it + * reflects the common usage. + * + * NOTE: NETMAP_PRIV_MEM IS DEPRECATED, use nr_arg2 instead. + * NETMAP_PRIV_MEM is set on return for ports that do not use + * the global memory allocator. + * This information is not significant and applications + * should look at the region id in nr_arg2 + * + * nr_flags is the recommended mode to indicate which rings should + * be bound to a file descriptor. Values are NR_REG_* + * + * nr_arg1 (in) The number of extra rings to be reserved. + * Especially when allocating a VALE port the system only + * allocates the amount of memory needed for the port. + * If more shared memory rings are desired (e.g. for pipes), + * the first invocation for the same basename/allocator + * should specify a suitable number. Memory cannot be + * extended after the first allocation without closing + * all ports on the same region. + * + * nr_arg2 (in/out) The identity of the memory region used. + * On input, 0 means the system decides autonomously, + * other values may try to select a specific region. + * On return the actual value is reported. + * Region '1' is the global allocator, normally shared + * by all interfaces. Other values are private regions. + * If two ports the same region zero-copy is possible. + * + * nr_arg3 (in/out) number of extra buffers to be allocated. + * + * + * + * nr_cmd (in) if non-zero indicates a special command: + * NETMAP_BDG_ATTACH and nr_name = vale*:ifname + * attaches the NIC to the switch; nr_ringid specifies + * which rings to use. Used by vale-ctl -a ... + * nr_arg1 = NETMAP_BDG_HOST also attaches the host port + * as in vale-ctl -h ... + * + * NETMAP_BDG_DETACH and nr_name = vale*:ifname + * disconnects a previously attached NIC. + * Used by vale-ctl -d ... + * + * NETMAP_BDG_LIST + * list the configuration of VALE switches. + * + * NETMAP_BDG_VNET_HDR + * Set the virtio-net header length used by the client + * of a VALE switch port. + * + * nr_arg1, nr_arg2, nr_arg3 (in/out) command specific + * + * * - * NETMAP_API is the API version. */ + /* - * struct nmreq overlays a struct ifreq + * struct nmreq overlays a struct ifreq (just the name) + * + * On input, nr_ringid indicates which rings we are requesting, + * with the low flags for the specific ring number. + * selection FLAGS RING INDEX + * + * all the NIC rings 0x0000 - + * only HOST ring 0x2000 ring index + * single NIC ring 0x4000 - + * all the NIC+HOST rings 0x6000 - + * one pipe ring, master 0x8000 ring index + * *** INVALID 0xA000 + * one pipe ring, slave 0xC000 ring index + * *** INVALID 0xE000 + * */ struct nmreq { char nr_name[IFNAMSIZ]; uint32_t nr_version; /* API version */ -#define NETMAP_API 4 /* current version */ uint32_t nr_offset; /* nifp offset in the shared region */ uint32_t nr_memsize; /* size of the shared region */ uint32_t nr_tx_slots; /* slots in tx rings */ uint32_t nr_rx_slots; /* slots in rx rings */ uint16_t nr_tx_rings; /* number of tx rings */ uint16_t nr_rx_rings; /* number of rx rings */ + uint16_t nr_ringid; /* ring(s) we care about */ -#define NETMAP_HW_RING 0x4000 /* low bits indicate one hw ring */ -#define NETMAP_SW_RING 0x2000 /* process the sw ring */ +#define NETMAP_HW_RING 0x4000 /* single NIC ring pair */ +#define NETMAP_SW_RING 0x2000 /* only host ring pair */ + +#define NETMAP_RING_MASK 0x0fff /* the ring number */ + #define NETMAP_NO_TX_POLL 0x1000 /* no automatic txsync on poll */ -#define NETMAP_RING_MASK 0xfff /* the ring number */ + +#define NETMAP_DO_RX_POLL 0x8000 /* DO automatic rxsync on poll */ + uint16_t nr_cmd; #define NETMAP_BDG_ATTACH 1 /* attach the NIC */ #define NETMAP_BDG_DETACH 2 /* detach the NIC */ #define NETMAP_BDG_LOOKUP_REG 3 /* register lookup function */ #define NETMAP_BDG_LIST 4 /* get bridge's info */ - uint16_t nr_arg1; +#define NETMAP_BDG_VNET_HDR 5 /* set the port virtio-net-hdr length */ +#define NETMAP_BDG_OFFSET NETMAP_BDG_VNET_HDR /* deprecated alias */ + + uint16_t nr_arg1; /* reserve extra rings in NIOCREGIF */ #define NETMAP_BDG_HOST 1 /* attach the host stack on ATTACH */ + uint16_t nr_arg2; - uint32_t spare2[3]; + uint32_t nr_arg3; /* req. extra buffers in NIOCREGIF */ + uint32_t nr_flags; + /* various modes, extends nr_ringid */ + uint32_t spare2[1]; +}; + +#define NR_REG_MASK 0xf /* values for nr_flags */ +enum { NR_REG_DEFAULT = 0, /* backward compat, should not be used. */ + NR_REG_ALL_NIC = 1, + NR_REG_SW = 2, + NR_REG_NIC_SW = 3, + NR_REG_ONE_NIC = 4, + NR_REG_PIPE_MASTER = 5, + NR_REG_PIPE_SLAVE = 6, }; +/* monitor uses the NR_REG to select the rings to monitor */ +#define NR_MONITOR_TX 0x100 +#define NR_MONITOR_RX 0x200 + /* * FreeBSD uses the size value embedded in the _IOWR to determine @@ -343,9 +529,22 @@ struct nmreq { */ #define NIOCGINFO _IOWR('i', 145, struct nmreq) /* return IF info */ #define NIOCREGIF _IOWR('i', 146, struct nmreq) /* interface register */ -#define NIOCUNREGIF _IO('i', 147) /* interface unregister */ #define NIOCTXSYNC _IO('i', 148) /* sync tx queues */ #define NIOCRXSYNC _IO('i', 149) /* sync rx queues */ #endif /* !NIOCREGIF */ + +/* + * Helper functions for kernel and userspace + */ + +/* + * check if space is available in the ring. + */ +static inline int +nm_ring_empty(struct netmap_ring *ring) +{ + return (ring->cur == ring->tail); +} + #endif /* _NET_NETMAP_H_ */ diff --git a/sys/net/netmap_user.h b/sys/net/netmap_user.h index fcb5cb3..9c3a4c1 100644 --- a/sys/net/netmap_user.h +++ b/sys/net/netmap_user.h @@ -1,40 +1,34 @@ /* - * Copyright (C) 2011 Matteo Landi, Luigi Rizzo. All rights reserved. - * + * Copyright (C) 2011-2014 Universita` di Pisa. All rights reserved. + * * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * + * 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. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the - * distribution. - * - * 3. Neither the name of the authors nor the names of their contributors - * may be used to endorse or promote products derived from this - * software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY MATTEO LANDI AND CONTRIBUTORS "AS IS" AND + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 MATTEO LANDI 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. + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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. */ /* * $FreeBSD$ * - * This header contains the macros used to manipulate netmap structures - * and packets in userspace. See netmap(4) for more information. + * Functions and macros to manipulate netmap structures and packets + * in userspace. See netmap(4) for more information. * * The address of the struct netmap_if, say nifp, is computed from the * value returned from ioctl(.., NIOCREG, ...) and the mmap region: @@ -49,22 +43,44 @@ * we can access ring->nr_cur, ring->nr_avail, ring->nr_flags * * ring->slot[i] gives us the i-th slot (we can access - * directly plen, flags, bufindex) + * directly len, flags, buf_idx) * * char *buf = NETMAP_BUF(ring, x) returns a pointer to * the buffer numbered x * - * Since rings are circular, we have macros to compute the next index - * i = NETMAP_RING_NEXT(ring, i); + * All ring indexes (head, cur, tail) should always move forward. + * To compute the next index in a circular ring you can use + * i = nm_ring_next(ring, i); + * + * To ease porting apps from pcap to netmap we supply a few fuctions + * that can be called to open, close, read and write on netmap in a way + * similar to libpcap. Note that the read/write function depend on + * an ioctl()/select()/poll() being issued to refill rings or push + * packets out. + * + * In order to use these, include #define NETMAP_WITH_LIBS + * in the source file that invokes these functions. */ #ifndef _NET_NETMAP_USER_H_ #define _NET_NETMAP_USER_H_ +#include +#include /* apple needs sockaddr */ +#include /* IFNAMSIZ */ + +#ifndef likely +#define likely(x) __builtin_expect(!!(x), 1) +#define unlikely(x) __builtin_expect(!!(x), 0) +#endif /* likely and unlikely */ + +#include + +/* helper macro */ #define _NETMAP_OFFSET(type, ptr, offset) \ ((type)(void *)((char *)(ptr) + (offset))) -#define NETMAP_IF(b, o) _NETMAP_OFFSET(struct netmap_if *, b, o) +#define NETMAP_IF(_base, _ofs) _NETMAP_OFFSET(struct netmap_if *, _base, _ofs) #define NETMAP_TXRING(nifp, index) _NETMAP_OFFSET(struct netmap_ring *, \ nifp, (nifp)->ring_ofs[index] ) @@ -77,19 +93,585 @@ #define NETMAP_BUF_IDX(ring, buf) \ ( ((char *)(buf) - ((char *)(ring) + (ring)->buf_ofs) ) / \ - (ring)->nr_buf_size ) + (ring)->nr_buf_size ) + + +static inline uint32_t +nm_ring_next(struct netmap_ring *r, uint32_t i) +{ + return ( unlikely(i + 1 == r->num_slots) ? 0 : i + 1); +} + + +/* + * Return 1 if we have pending transmissions in the tx ring. + * When everything is complete ring->head = ring->tail + 1 (modulo ring size) + */ +static inline int +nm_tx_pending(struct netmap_ring *r) +{ + return nm_ring_next(r, r->tail) != r->head; +} + -#define NETMAP_RING_NEXT(r, i) \ - ((i)+1 == (r)->num_slots ? 0 : (i) + 1 ) +static inline uint32_t +nm_ring_space(struct netmap_ring *ring) +{ + int ret = ring->tail - ring->cur; + if (ret < 0) + ret += ring->num_slots; + return ret; +} -#define NETMAP_RING_FIRST_RESERVED(r) \ - ( (r)->cur < (r)->reserved ? \ - (r)->cur + (r)->num_slots - (r)->reserved : \ - (r)->cur - (r)->reserved ) +#ifdef NETMAP_WITH_LIBS /* - * Return 1 if the given tx ring is empty. + * Support for simple I/O libraries. + * Include other system headers required for compiling this. */ -#define NETMAP_TX_RING_EMPTY(r) ((r)->avail >= (r)->num_slots - 1) + +#ifndef HAVE_NETMAP_WITH_LIBS +#define HAVE_NETMAP_WITH_LIBS + +#include +#include +#include /* memset */ +#include +#include /* EINVAL */ +#include /* O_RDWR */ +#include /* close() */ +#include +#include + +#ifndef ND /* debug macros */ +/* debug support */ +#define ND(_fmt, ...) do {} while(0) +#define D(_fmt, ...) \ + do { \ + struct timeval t0; \ + gettimeofday(&t0, NULL); \ + fprintf(stderr, "%03d.%06d %s [%d] " _fmt "\n", \ + (int)(t0.tv_sec % 1000), (int)t0.tv_usec, \ + __FUNCTION__, __LINE__, ##__VA_ARGS__); \ + } while (0) + +/* Rate limited version of "D", lps indicates how many per second */ +#define RD(lps, format, ...) \ + do { \ + static int t0, __cnt; \ + struct timeval __xxts; \ + gettimeofday(&__xxts, NULL); \ + if (t0 != __xxts.tv_sec) { \ + t0 = __xxts.tv_sec; \ + __cnt = 0; \ + } \ + if (__cnt++ < lps) { \ + D(format, ##__VA_ARGS__); \ + } \ + } while (0) +#endif + +struct nm_pkthdr { /* same as pcap_pkthdr */ + struct timeval ts; + uint32_t caplen; + uint32_t len; +}; + +struct nm_stat { /* same as pcap_stat */ + u_int ps_recv; + u_int ps_drop; + u_int ps_ifdrop; +#ifdef WIN32 + u_int bs_capt; +#endif /* WIN32 */ +}; + +#define NM_ERRBUF_SIZE 512 + +struct nm_desc { + struct nm_desc *self; /* point to self if netmap. */ + int fd; + void *mem; + int memsize; + int done_mmap; /* set if mem is the result of mmap */ + struct netmap_if * const nifp; + uint16_t first_tx_ring, last_tx_ring, cur_tx_ring; + uint16_t first_rx_ring, last_rx_ring, cur_rx_ring; + struct nmreq req; /* also contains the nr_name = ifname */ + struct nm_pkthdr hdr; + + /* + * The memory contains netmap_if, rings and then buffers. + * Given a pointer (e.g. to nm_inject) we can compare with + * mem/buf_start/buf_end to tell if it is a buffer or + * some other descriptor in our region. + * We also store a pointer to some ring as it helps in the + * translation from buffer indexes to addresses. + */ + struct netmap_ring * const some_ring; + void * const buf_start; + void * const buf_end; + /* parameters from pcap_open_live */ + int snaplen; + int promisc; + int to_ms; + char *errbuf; + + /* save flags so we can restore them on close */ + uint32_t if_flags; + uint32_t if_reqcap; + uint32_t if_curcap; + + struct nm_stat st; + char msg[NM_ERRBUF_SIZE]; +}; + +/* + * when the descriptor is open correctly, d->self == d + * Eventually we should also use some magic number. + */ +#define P2NMD(p) ((struct nm_desc *)(p)) +#define IS_NETMAP_DESC(d) ((d) && P2NMD(d)->self == P2NMD(d)) +#define NETMAP_FD(d) (P2NMD(d)->fd) + + +/* + * this is a slightly optimized copy routine which rounds + * to multiple of 64 bytes and is often faster than dealing + * with other odd sizes. We assume there is enough room + * in the source and destination buffers. + * + * XXX only for multiples of 64 bytes, non overlapped. + */ +static inline void +nm_pkt_copy(const void *_src, void *_dst, int l) +{ + const uint64_t *src = (const uint64_t *)_src; + uint64_t *dst = (uint64_t *)_dst; + + if (unlikely(l >= 1024)) { + memcpy(dst, src, l); + return; + } + for (; likely(l > 0); l-=64) { + *dst++ = *src++; + *dst++ = *src++; + *dst++ = *src++; + *dst++ = *src++; + *dst++ = *src++; + *dst++ = *src++; + *dst++ = *src++; + *dst++ = *src++; + } +} + + +/* + * The callback, invoked on each received packet. Same as libpcap + */ +typedef void (*nm_cb_t)(u_char *, const struct nm_pkthdr *, const u_char *d); + +/* + *--- the pcap-like API --- + * + * nm_open() opens a file descriptor, binds to a port and maps memory. + * + * ifname (netmap:foo or vale:foo) is the port name + * a suffix can indicate the follwing: + * ^ bind the host (sw) ring pair + * * bind host and NIC ring pairs (transparent) + * -NN bind individual NIC ring pair + * {NN bind master side of pipe NN + * }NN bind slave side of pipe NN + * + * req provides the initial values of nmreq before parsing ifname. + * Remember that the ifname parsing will override the ring + * number in nm_ringid, and part of nm_flags; + * flags special functions, normally 0 + * indicates which fields of *arg are significant + * arg special functions, normally NULL + * if passed a netmap_desc with mem != NULL, + * use that memory instead of mmap. + */ + +static struct nm_desc *nm_open(const char *ifname, const struct nmreq *req, + uint64_t flags, const struct nm_desc *arg); + +/* + * nm_open can import some fields from the parent descriptor. + * These flags control which ones. + * Also in flags you can specify NETMAP_NO_TX_POLL and NETMAP_DO_RX_POLL, + * which set the initial value for these flags. + * Note that the 16 low bits of the flags are reserved for data + * that may go into the nmreq. + */ +enum { + NM_OPEN_NO_MMAP = 0x040000, /* reuse mmap from parent */ + NM_OPEN_IFNAME = 0x080000, /* nr_name, nr_ringid, nr_flags */ + NM_OPEN_ARG1 = 0x100000, + NM_OPEN_ARG2 = 0x200000, + NM_OPEN_ARG3 = 0x400000, + NM_OPEN_RING_CFG = 0x800000, /* tx|rx rings|slots */ +}; + + +/* + * nm_close() closes and restores the port to its previous state + */ + +static int nm_close(struct nm_desc *); + +/* + * nm_inject() is the same as pcap_inject() + * nm_dispatch() is the same as pcap_dispatch() + * nm_nextpkt() is the same as pcap_next() + */ + +static int nm_inject(struct nm_desc *, const void *, size_t); +static int nm_dispatch(struct nm_desc *, int, nm_cb_t, u_char *); +static u_char *nm_nextpkt(struct nm_desc *, struct nm_pkthdr *); + + +/* + * Try to open, return descriptor if successful, NULL otherwise. + * An invalid netmap name will return errno = 0; + * You can pass a pointer to a pre-filled nm_desc to add special + * parameters. Flags is used as follows + * NM_OPEN_NO_MMAP use the memory from arg, only + * if the nr_arg2 (memory block) matches. + * NM_OPEN_ARG1 use req.nr_arg1 from arg + * NM_OPEN_ARG2 use req.nr_arg2 from arg + * NM_OPEN_RING_CFG user ring config from arg + */ +static struct nm_desc * +nm_open(const char *ifname, const struct nmreq *req, + uint64_t new_flags, const struct nm_desc *arg) +{ + struct nm_desc *d = NULL; + const struct nm_desc *parent = arg; + u_int namelen; + uint32_t nr_ringid = 0, nr_flags; + const char *port = NULL; + const char *errmsg = NULL; + + if (strncmp(ifname, "netmap:", 7) && strncmp(ifname, "vale", 4)) { + errno = 0; /* name not recognised, not an error */ + return NULL; + } + if (ifname[0] == 'n') + ifname += 7; + /* scan for a separator */ + for (port = ifname; *port && !index("-*^{}", *port); port++) + ; + namelen = port - ifname; + if (namelen >= sizeof(d->req.nr_name)) { + errmsg = "name too long"; + goto fail; + } + switch (*port) { + default: /* '\0', no suffix */ + nr_flags = NR_REG_ALL_NIC; + break; + case '-': /* one NIC */ + nr_flags = NR_REG_ONE_NIC; + nr_ringid = atoi(port + 1); + break; + case '*': /* NIC and SW, ignore port */ + nr_flags = NR_REG_NIC_SW; + if (port[1]) { + errmsg = "invalid port for nic+sw"; + goto fail; + } + break; + case '^': /* only sw ring */ + nr_flags = NR_REG_SW; + if (port[1]) { + errmsg = "invalid port for sw ring"; + goto fail; + } + break; + case '{': + nr_flags = NR_REG_PIPE_MASTER; + nr_ringid = atoi(port + 1); + break; + case '}': + nr_flags = NR_REG_PIPE_SLAVE; + nr_ringid = atoi(port + 1); + break; + } + + if (nr_ringid >= NETMAP_RING_MASK) { + errmsg = "invalid ringid"; + goto fail; + } + /* add the *XPOLL flags */ + nr_ringid |= new_flags & (NETMAP_NO_TX_POLL | NETMAP_DO_RX_POLL); + + d = (struct nm_desc *)calloc(1, sizeof(*d)); + if (d == NULL) { + errmsg = "nm_desc alloc failure"; + errno = ENOMEM; + return NULL; + } + d->self = d; /* set this early so nm_close() works */ + d->fd = open("/dev/netmap", O_RDWR); + if (d->fd < 0) { + errmsg = "cannot open /dev/netmap"; + goto fail; + } + + if (req) + d->req = *req; + d->req.nr_version = NETMAP_API; + d->req.nr_ringid &= ~NETMAP_RING_MASK; + + /* these fields are overridden by ifname and flags processing */ + d->req.nr_ringid |= nr_ringid; + d->req.nr_flags = nr_flags; + memcpy(d->req.nr_name, ifname, namelen); + d->req.nr_name[namelen] = '\0'; + /* optionally import info from parent */ + if (IS_NETMAP_DESC(parent) && new_flags) { + if (new_flags & NM_OPEN_ARG1) + D("overriding ARG1 %d", parent->req.nr_arg1); + d->req.nr_arg1 = new_flags & NM_OPEN_ARG1 ? + parent->req.nr_arg1 : 4; + if (new_flags & NM_OPEN_ARG2) + D("overriding ARG2 %d", parent->req.nr_arg2); + d->req.nr_arg2 = new_flags & NM_OPEN_ARG2 ? + parent->req.nr_arg2 : 0; + if (new_flags & NM_OPEN_ARG3) + D("overriding ARG3 %d", parent->req.nr_arg3); + d->req.nr_arg3 = new_flags & NM_OPEN_ARG3 ? + parent->req.nr_arg3 : 0; + if (new_flags & NM_OPEN_RING_CFG) { + D("overriding RING_CFG"); + d->req.nr_tx_slots = parent->req.nr_tx_slots; + d->req.nr_rx_slots = parent->req.nr_rx_slots; + d->req.nr_tx_rings = parent->req.nr_tx_rings; + d->req.nr_rx_rings = parent->req.nr_rx_rings; + } + if (new_flags & NM_OPEN_IFNAME) { + D("overriding ifname %s ringid 0x%x flags 0x%x", + parent->req.nr_name, parent->req.nr_ringid, + parent->req.nr_flags); + memcpy(d->req.nr_name, parent->req.nr_name, + sizeof(d->req.nr_name)); + d->req.nr_ringid = parent->req.nr_ringid; + d->req.nr_flags = parent->req.nr_flags; + } + } + if (ioctl(d->fd, NIOCREGIF, &d->req)) { + errmsg = "NIOCREGIF failed"; + goto fail; + } + + if (IS_NETMAP_DESC(parent) && parent->mem && + parent->req.nr_arg2 == d->req.nr_arg2) { + /* do not mmap, inherit from parent */ + d->memsize = parent->memsize; + d->mem = parent->mem; + } else { + d->memsize = d->req.nr_memsize; + d->mem = mmap(0, d->memsize, PROT_WRITE | PROT_READ, MAP_SHARED, + d->fd, 0); + if (d->mem == NULL) { + errmsg = "mmap failed"; + goto fail; + } + d->done_mmap = 1; + } + { + struct netmap_if *nifp = NETMAP_IF(d->mem, d->req.nr_offset); + struct netmap_ring *r = NETMAP_RXRING(nifp, ); + + *(struct netmap_if **)(uintptr_t)&(d->nifp) = nifp; + *(struct netmap_ring **)(uintptr_t)&d->some_ring = r; + *(void **)(uintptr_t)&d->buf_start = NETMAP_BUF(r, 0); + *(void **)(uintptr_t)&d->buf_end = + (char *)d->mem + d->memsize; + } + + if (nr_flags == NR_REG_SW) { /* host stack */ + d->first_tx_ring = d->last_tx_ring = d->req.nr_tx_rings; + d->first_rx_ring = d->last_rx_ring = d->req.nr_rx_rings; + } else if (nr_flags == NR_REG_ALL_NIC) { /* only nic */ + d->first_tx_ring = 0; + d->first_rx_ring = 0; + d->last_tx_ring = d->req.nr_tx_rings - 1; + d->last_rx_ring = d->req.nr_rx_rings - 1; + } else if (nr_flags == NR_REG_NIC_SW) { + d->first_tx_ring = 0; + d->first_rx_ring = 0; + d->last_tx_ring = d->req.nr_tx_rings; + d->last_rx_ring = d->req.nr_rx_rings; + } else if (nr_flags == NR_REG_ONE_NIC) { + /* XXX check validity */ + d->first_tx_ring = d->last_tx_ring = + d->first_rx_ring = d->last_rx_ring = nr_ringid; + } else { /* pipes */ + d->first_tx_ring = d->last_tx_ring = 0; + d->first_rx_ring = d->last_rx_ring = 0; + } + +#ifdef DEBUG_NETMAP_USER + { /* debugging code */ + int i; + + D("%s tx %d .. %d %d rx %d .. %d %d", ifname, + d->first_tx_ring, d->last_tx_ring, d->req.nr_tx_rings, + d->first_rx_ring, d->last_rx_ring, d->req.nr_rx_rings); + for (i = 0; i <= d->req.nr_tx_rings; i++) { + struct netmap_ring *r = NETMAP_TXRING(d->nifp, i); + D("TX%d %p h %d c %d t %d", i, r, r->head, r->cur, r->tail); + } + for (i = 0; i <= d->req.nr_rx_rings; i++) { + struct netmap_ring *r = NETMAP_RXRING(d->nifp, i); + D("RX%d %p h %d c %d t %d", i, r, r->head, r->cur, r->tail); + } + } +#endif /* debugging */ + + d->cur_tx_ring = d->first_tx_ring; + d->cur_rx_ring = d->first_rx_ring; + return d; + +fail: + nm_close(d); + if (errmsg) + D("%s %s", errmsg, ifname); + errno = EINVAL; + return NULL; +} + + +static int +nm_close(struct nm_desc *d) +{ + /* + * ugly trick to avoid unused warnings + */ + static void *__xxzt[] __attribute__ ((unused)) = + { (void *)nm_open, (void *)nm_inject, + (void *)nm_dispatch, (void *)nm_nextpkt } ; + + if (d == NULL || d->self != d) + return EINVAL; + if (d->done_mmap && d->mem) + munmap(d->mem, d->memsize); + if (d->fd != -1) + close(d->fd); + bzero(d, sizeof(*d)); + free(d); + return 0; +} + + +/* + * Same prototype as pcap_inject(), only need to cast. + */ +static int +nm_inject(struct nm_desc *d, const void *buf, size_t size) +{ + u_int c, n = d->last_tx_ring - d->first_tx_ring + 1; + + for (c = 0; c < n ; c++) { + /* compute current ring to use */ + struct netmap_ring *ring; + uint32_t i, idx; + uint32_t ri = d->cur_tx_ring + c; + + if (ri > d->last_tx_ring) + ri = d->first_tx_ring; + ring = NETMAP_TXRING(d->nifp, ri); + if (nm_ring_empty(ring)) { + continue; + } + i = ring->cur; + idx = ring->slot[i].buf_idx; + ring->slot[i].len = size; + nm_pkt_copy(buf, NETMAP_BUF(ring, idx), size); + d->cur_tx_ring = ri; + ring->head = ring->cur = nm_ring_next(ring, i); + return size; + } + return 0; /* fail */ +} + + +/* + * Same prototype as pcap_dispatch(), only need to cast. + */ +static int +nm_dispatch(struct nm_desc *d, int cnt, nm_cb_t cb, u_char *arg) +{ + int n = d->last_rx_ring - d->first_rx_ring + 1; + int c, got = 0, ri = d->cur_rx_ring; + + if (cnt == 0) + cnt = -1; + /* cnt == -1 means infinite, but rings have a finite amount + * of buffers and the int is large enough that we never wrap, + * so we can omit checking for -1 + */ + for (c=0; c < n && cnt != got; c++) { + /* compute current ring to use */ + struct netmap_ring *ring; + + ri = d->cur_rx_ring + c; + if (ri > d->last_rx_ring) + ri = d->first_rx_ring; + ring = NETMAP_RXRING(d->nifp, ri); + for ( ; !nm_ring_empty(ring) && cnt != got; got++) { + u_int i = ring->cur; + u_int idx = ring->slot[i].buf_idx; + u_char *buf = (u_char *)NETMAP_BUF(ring, idx); + + // __builtin_prefetch(buf); + d->hdr.len = d->hdr.caplen = ring->slot[i].len; + d->hdr.ts = ring->ts; + cb(arg, &d->hdr, buf); + ring->head = ring->cur = nm_ring_next(ring, i); + } + } + d->cur_rx_ring = ri; + return got; +} + +static u_char * +nm_nextpkt(struct nm_desc *d, struct nm_pkthdr *hdr) +{ + int ri = d->cur_rx_ring; + + do { + /* compute current ring to use */ + struct netmap_ring *ring = NETMAP_RXRING(d->nifp, ri); + if (!nm_ring_empty(ring)) { + u_int i = ring->cur; + u_int idx = ring->slot[i].buf_idx; + u_char *buf = (u_char *)NETMAP_BUF(ring, idx); + + // __builtin_prefetch(buf); + hdr->ts = ring->ts; + hdr->len = hdr->caplen = ring->slot[i].len; + ring->cur = nm_ring_next(ring, i); + /* we could postpone advancing head if we want + * to hold the buffer. This can be supported in + * the future. + */ + ring->head = ring->cur; + d->cur_rx_ring = ri; + return buf; + } + ri++; + if (ri > d->last_rx_ring) + ri = d->first_rx_ring; + } while (ri != d->cur_rx_ring); + return NULL; /* nothing found */ +} + +#endif /* !HAVE_NETMAP_WITH_LIBS */ + +#endif /* NETMAP_WITH_LIBS */ #endif /* _NET_NETMAP_USER_H_ */ -- cgit v1.1