tools: hv: Add vmbus_bufring
Common userspace interface for read/write from VMBus ringbuffer. This implementation is open for use by any userspace driver or application seeking direct control over VMBus ring buffers. A significant part of this code is borrowed from DPDK. Link: https://github.com/DPDK/dpdk/ Currently this library is not supported for ARM64. Signed-off-by: Mary Hardy <maryhardy@microsoft.com> Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Link: https://lore.kernel.org/r/1711788723-8593-5-git-send-email-ssengar@linux.microsoft.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Saurabh Sengar
Greg Kroah-Hartman
parent
547fa4ffd7
commit
45bab4d746
318
tools/hv/vmbus_bufring.c
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318
tools/hv/vmbus_bufring.c
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// SPDX-License-Identifier: BSD-3-Clause
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/*
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* Copyright (c) 2009-2012,2016,2023 Microsoft Corp.
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* Copyright (c) 2012 NetApp Inc.
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* Copyright (c) 2012 Citrix Inc.
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* All rights reserved.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <emmintrin.h>
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#include <linux/limits.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#include "vmbus_bufring.h"
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/**
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* Compiler barrier.
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*
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* Guarantees that operation reordering does not occur at compile time
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* for operations directly before and after the barrier.
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*/
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#define rte_compiler_barrier() ({ asm volatile ("" : : : "memory"); })
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#define VMBUS_RQST_ERROR 0xFFFFFFFFFFFFFFFF
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#define ALIGN(val, align) ((typeof(val))((val) & (~((typeof(val))((align) - 1)))))
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void *vmbus_uio_map(int *fd, int size)
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{
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void *map;
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map = mmap(NULL, 2 * size, PROT_READ | PROT_WRITE, MAP_SHARED, *fd, 0);
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if (map == MAP_FAILED)
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return NULL;
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return map;
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}
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/* Increase bufring index by inc with wraparound */
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static inline uint32_t vmbus_br_idxinc(uint32_t idx, uint32_t inc, uint32_t sz)
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{
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idx += inc;
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if (idx >= sz)
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idx -= sz;
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return idx;
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}
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void vmbus_br_setup(struct vmbus_br *br, void *buf, unsigned int blen)
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{
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br->vbr = buf;
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br->windex = br->vbr->windex;
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br->dsize = blen - sizeof(struct vmbus_bufring);
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}
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static inline __always_inline void
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rte_smp_mb(void)
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{
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asm volatile("lock addl $0, -128(%%rsp); " ::: "memory");
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}
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static inline int
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rte_atomic32_cmpset(volatile uint32_t *dst, uint32_t exp, uint32_t src)
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{
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uint8_t res;
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asm volatile("lock ; "
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"cmpxchgl %[src], %[dst];"
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"sete %[res];"
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: [res] "=a" (res), /* output */
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[dst] "=m" (*dst)
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: [src] "r" (src), /* input */
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"a" (exp),
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"m" (*dst)
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: "memory"); /* no-clobber list */
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return res;
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}
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static inline uint32_t
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vmbus_txbr_copyto(const struct vmbus_br *tbr, uint32_t windex,
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const void *src0, uint32_t cplen)
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{
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uint8_t *br_data = tbr->vbr->data;
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uint32_t br_dsize = tbr->dsize;
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const uint8_t *src = src0;
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/* XXX use double mapping like Linux kernel? */
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if (cplen > br_dsize - windex) {
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uint32_t fraglen = br_dsize - windex;
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/* Wrap-around detected */
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memcpy(br_data + windex, src, fraglen);
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memcpy(br_data, src + fraglen, cplen - fraglen);
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} else {
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memcpy(br_data + windex, src, cplen);
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}
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return vmbus_br_idxinc(windex, cplen, br_dsize);
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}
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/*
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* Write scattered channel packet to TX bufring.
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*
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* The offset of this channel packet is written as a 64bits value
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* immediately after this channel packet.
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*
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* The write goes through three stages:
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* 1. Reserve space in ring buffer for the new data.
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* Writer atomically moves priv_write_index.
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* 2. Copy the new data into the ring.
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* 3. Update the tail of the ring (visible to host) that indicates
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* next read location. Writer updates write_index
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*/
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static int
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vmbus_txbr_write(struct vmbus_br *tbr, const struct iovec iov[], int iovlen)
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{
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struct vmbus_bufring *vbr = tbr->vbr;
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uint32_t ring_size = tbr->dsize;
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uint32_t old_windex, next_windex, windex, total;
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uint64_t save_windex;
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int i;
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total = 0;
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for (i = 0; i < iovlen; i++)
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total += iov[i].iov_len;
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total += sizeof(save_windex);
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/* Reserve space in ring */
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do {
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uint32_t avail;
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/* Get current free location */
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old_windex = tbr->windex;
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/* Prevent compiler reordering this with calculation */
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rte_compiler_barrier();
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avail = vmbus_br_availwrite(tbr, old_windex);
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/* If not enough space in ring, then tell caller. */
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if (avail <= total)
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return -EAGAIN;
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next_windex = vmbus_br_idxinc(old_windex, total, ring_size);
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/* Atomic update of next write_index for other threads */
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} while (!rte_atomic32_cmpset(&tbr->windex, old_windex, next_windex));
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/* Space from old..new is now reserved */
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windex = old_windex;
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for (i = 0; i < iovlen; i++)
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windex = vmbus_txbr_copyto(tbr, windex, iov[i].iov_base, iov[i].iov_len);
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/* Set the offset of the current channel packet. */
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save_windex = ((uint64_t)old_windex) << 32;
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windex = vmbus_txbr_copyto(tbr, windex, &save_windex,
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sizeof(save_windex));
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/* The region reserved should match region used */
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if (windex != next_windex)
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return -EINVAL;
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/* Ensure that data is available before updating host index */
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rte_compiler_barrier();
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/* Checkin for our reservation. wait for our turn to update host */
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while (!rte_atomic32_cmpset(&vbr->windex, old_windex, next_windex))
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_mm_pause();
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return 0;
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}
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int rte_vmbus_chan_send(struct vmbus_br *txbr, uint16_t type, void *data,
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uint32_t dlen, uint32_t flags)
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{
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struct vmbus_chanpkt pkt;
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unsigned int pktlen, pad_pktlen;
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const uint32_t hlen = sizeof(pkt);
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uint64_t pad = 0;
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struct iovec iov[3];
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int error;
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pktlen = hlen + dlen;
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pad_pktlen = ALIGN(pktlen, sizeof(uint64_t));
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pkt.hdr.type = type;
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pkt.hdr.flags = flags;
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pkt.hdr.hlen = hlen >> VMBUS_CHANPKT_SIZE_SHIFT;
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pkt.hdr.tlen = pad_pktlen >> VMBUS_CHANPKT_SIZE_SHIFT;
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pkt.hdr.xactid = VMBUS_RQST_ERROR;
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iov[0].iov_base = &pkt;
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iov[0].iov_len = hlen;
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iov[1].iov_base = data;
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iov[1].iov_len = dlen;
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iov[2].iov_base = &pad;
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iov[2].iov_len = pad_pktlen - pktlen;
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error = vmbus_txbr_write(txbr, iov, 3);
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return error;
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}
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static inline uint32_t
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vmbus_rxbr_copyfrom(const struct vmbus_br *rbr, uint32_t rindex,
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void *dst0, size_t cplen)
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{
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const uint8_t *br_data = rbr->vbr->data;
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uint32_t br_dsize = rbr->dsize;
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uint8_t *dst = dst0;
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if (cplen > br_dsize - rindex) {
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uint32_t fraglen = br_dsize - rindex;
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/* Wrap-around detected. */
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memcpy(dst, br_data + rindex, fraglen);
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memcpy(dst + fraglen, br_data, cplen - fraglen);
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} else {
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memcpy(dst, br_data + rindex, cplen);
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}
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return vmbus_br_idxinc(rindex, cplen, br_dsize);
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}
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/* Copy data from receive ring but don't change index */
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static int
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vmbus_rxbr_peek(const struct vmbus_br *rbr, void *data, size_t dlen)
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{
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uint32_t avail;
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/*
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* The requested data and the 64bits channel packet
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* offset should be there at least.
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*/
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avail = vmbus_br_availread(rbr);
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if (avail < dlen + sizeof(uint64_t))
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return -EAGAIN;
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vmbus_rxbr_copyfrom(rbr, rbr->vbr->rindex, data, dlen);
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return 0;
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}
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/*
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* Copy data from receive ring and change index
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* NOTE:
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* We assume (dlen + skip) == sizeof(channel packet).
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*/
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static int
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vmbus_rxbr_read(struct vmbus_br *rbr, void *data, size_t dlen, size_t skip)
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{
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struct vmbus_bufring *vbr = rbr->vbr;
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uint32_t br_dsize = rbr->dsize;
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uint32_t rindex;
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if (vmbus_br_availread(rbr) < dlen + skip + sizeof(uint64_t))
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return -EAGAIN;
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/* Record where host was when we started read (for debug) */
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rbr->windex = rbr->vbr->windex;
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/*
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* Copy channel packet from RX bufring.
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*/
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rindex = vmbus_br_idxinc(rbr->vbr->rindex, skip, br_dsize);
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rindex = vmbus_rxbr_copyfrom(rbr, rindex, data, dlen);
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/*
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* Discard this channel packet's 64bits offset, which is useless to us.
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*/
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rindex = vmbus_br_idxinc(rindex, sizeof(uint64_t), br_dsize);
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/* Update the read index _after_ the channel packet is fetched. */
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rte_compiler_barrier();
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vbr->rindex = rindex;
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return 0;
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}
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int rte_vmbus_chan_recv_raw(struct vmbus_br *rxbr,
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void *data, uint32_t *len)
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{
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struct vmbus_chanpkt_hdr pkt;
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uint32_t dlen, bufferlen = *len;
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int error;
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error = vmbus_rxbr_peek(rxbr, &pkt, sizeof(pkt));
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if (error)
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return error;
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if (unlikely(pkt.hlen < VMBUS_CHANPKT_HLEN_MIN))
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/* XXX this channel is dead actually. */
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return -EIO;
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if (unlikely(pkt.hlen > pkt.tlen))
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return -EIO;
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/* Length are in quad words */
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dlen = pkt.tlen << VMBUS_CHANPKT_SIZE_SHIFT;
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*len = dlen;
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/* If caller buffer is not large enough */
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if (unlikely(dlen > bufferlen))
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return -ENOBUFS;
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/* Read data and skip packet header */
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error = vmbus_rxbr_read(rxbr, data, dlen, 0);
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if (error)
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return error;
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/* Return the number of bytes read */
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return dlen + sizeof(uint64_t);
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}
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158
tools/hv/vmbus_bufring.h
Normal file
158
tools/hv/vmbus_bufring.h
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/* SPDX-License-Identifier: BSD-3-Clause */
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#ifndef _VMBUS_BUF_H_
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#define _VMBUS_BUF_H_
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#include <stdbool.h>
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#include <stdint.h>
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#define __packed __attribute__((__packed__))
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#define ICMSGHDRFLAG_TRANSACTION 1
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#define ICMSGHDRFLAG_REQUEST 2
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#define ICMSGHDRFLAG_RESPONSE 4
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#define IC_VERSION_NEGOTIATION_MAX_VER_COUNT 100
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#define ICMSG_HDR (sizeof(struct vmbuspipe_hdr) + sizeof(struct icmsg_hdr))
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#define ICMSG_NEGOTIATE_PKT_SIZE(icframe_vercnt, icmsg_vercnt) \
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(ICMSG_HDR + sizeof(struct icmsg_negotiate) + \
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(((icframe_vercnt) + (icmsg_vercnt)) * sizeof(struct ic_version)))
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/*
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* Channel packets
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*/
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/* Channel packet flags */
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#define VMBUS_CHANPKT_TYPE_INBAND 0x0006
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#define VMBUS_CHANPKT_TYPE_RXBUF 0x0007
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#define VMBUS_CHANPKT_TYPE_GPA 0x0009
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#define VMBUS_CHANPKT_TYPE_COMP 0x000b
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#define VMBUS_CHANPKT_FLAG_NONE 0
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#define VMBUS_CHANPKT_FLAG_RC 0x0001 /* report completion */
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#define VMBUS_CHANPKT_SIZE_SHIFT 3
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#define VMBUS_CHANPKT_SIZE_ALIGN BIT(VMBUS_CHANPKT_SIZE_SHIFT)
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#define VMBUS_CHANPKT_HLEN_MIN \
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(sizeof(struct vmbus_chanpkt_hdr) >> VMBUS_CHANPKT_SIZE_SHIFT)
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/*
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* Buffer ring
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*/
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struct vmbus_bufring {
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volatile uint32_t windex;
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volatile uint32_t rindex;
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|
||||||
|
/*
|
||||||
|
* Interrupt mask {0,1}
|
||||||
|
*
|
||||||
|
* For TX bufring, host set this to 1, when it is processing
|
||||||
|
* the TX bufring, so that we can safely skip the TX event
|
||||||
|
* notification to host.
|
||||||
|
*
|
||||||
|
* For RX bufring, once this is set to 1 by us, host will not
|
||||||
|
* further dispatch interrupts to us, even if there are data
|
||||||
|
* pending on the RX bufring. This effectively disables the
|
||||||
|
* interrupt of the channel to which this RX bufring is attached.
|
||||||
|
*/
|
||||||
|
volatile uint32_t imask;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Win8 uses some of the reserved bits to implement
|
||||||
|
* interrupt driven flow management. On the send side
|
||||||
|
* we can request that the receiver interrupt the sender
|
||||||
|
* when the ring transitions from being full to being able
|
||||||
|
* to handle a message of size "pending_send_sz".
|
||||||
|
*
|
||||||
|
* Add necessary state for this enhancement.
|
||||||
|
*/
|
||||||
|
volatile uint32_t pending_send;
|
||||||
|
uint32_t reserved1[12];
|
||||||
|
|
||||||
|
union {
|
||||||
|
struct {
|
||||||
|
uint32_t feat_pending_send_sz:1;
|
||||||
|
};
|
||||||
|
uint32_t value;
|
||||||
|
} feature_bits;
|
||||||
|
|
||||||
|
/* Pad it to rte_mem_page_size() so that data starts on page boundary */
|
||||||
|
uint8_t reserved2[4028];
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Ring data starts here + RingDataStartOffset
|
||||||
|
* !!! DO NOT place any fields below this !!!
|
||||||
|
*/
|
||||||
|
uint8_t data[];
|
||||||
|
} __packed;
|
||||||
|
|
||||||
|
struct vmbus_br {
|
||||||
|
struct vmbus_bufring *vbr;
|
||||||
|
uint32_t dsize;
|
||||||
|
uint32_t windex; /* next available location */
|
||||||
|
};
|
||||||
|
|
||||||
|
struct vmbus_chanpkt_hdr {
|
||||||
|
uint16_t type; /* VMBUS_CHANPKT_TYPE_ */
|
||||||
|
uint16_t hlen; /* header len, in 8 bytes */
|
||||||
|
uint16_t tlen; /* total len, in 8 bytes */
|
||||||
|
uint16_t flags; /* VMBUS_CHANPKT_FLAG_ */
|
||||||
|
uint64_t xactid;
|
||||||
|
} __packed;
|
||||||
|
|
||||||
|
struct vmbus_chanpkt {
|
||||||
|
struct vmbus_chanpkt_hdr hdr;
|
||||||
|
} __packed;
|
||||||
|
|
||||||
|
struct vmbuspipe_hdr {
|
||||||
|
unsigned int flags;
|
||||||
|
unsigned int msgsize;
|
||||||
|
} __packed;
|
||||||
|
|
||||||
|
struct ic_version {
|
||||||
|
unsigned short major;
|
||||||
|
unsigned short minor;
|
||||||
|
} __packed;
|
||||||
|
|
||||||
|
struct icmsg_negotiate {
|
||||||
|
unsigned short icframe_vercnt;
|
||||||
|
unsigned short icmsg_vercnt;
|
||||||
|
unsigned int reserved;
|
||||||
|
struct ic_version icversion_data[]; /* any size array */
|
||||||
|
} __packed;
|
||||||
|
|
||||||
|
struct icmsg_hdr {
|
||||||
|
struct ic_version icverframe;
|
||||||
|
unsigned short icmsgtype;
|
||||||
|
struct ic_version icvermsg;
|
||||||
|
unsigned short icmsgsize;
|
||||||
|
unsigned int status;
|
||||||
|
unsigned char ictransaction_id;
|
||||||
|
unsigned char icflags;
|
||||||
|
unsigned char reserved[2];
|
||||||
|
} __packed;
|
||||||
|
|
||||||
|
int rte_vmbus_chan_recv_raw(struct vmbus_br *rxbr, void *data, uint32_t *len);
|
||||||
|
int rte_vmbus_chan_send(struct vmbus_br *txbr, uint16_t type, void *data,
|
||||||
|
uint32_t dlen, uint32_t flags);
|
||||||
|
void vmbus_br_setup(struct vmbus_br *br, void *buf, unsigned int blen);
|
||||||
|
void *vmbus_uio_map(int *fd, int size);
|
||||||
|
|
||||||
|
/* Amount of space available for write */
|
||||||
|
static inline uint32_t vmbus_br_availwrite(const struct vmbus_br *br, uint32_t windex)
|
||||||
|
{
|
||||||
|
uint32_t rindex = br->vbr->rindex;
|
||||||
|
|
||||||
|
if (windex >= rindex)
|
||||||
|
return br->dsize - (windex - rindex);
|
||||||
|
else
|
||||||
|
return rindex - windex;
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline uint32_t vmbus_br_availread(const struct vmbus_br *br)
|
||||||
|
{
|
||||||
|
return br->dsize - vmbus_br_availwrite(br, br->vbr->windex);
|
||||||
|
}
|
||||||
|
|
||||||
|
#endif /* !_VMBUS_BUF_H_ */
|
||||||
Loading…
Reference in New Issue
Block a user