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android-kvm / linux / 33331a728c83f380e53a3dbf2be0c1893da1d739 / . / drivers / infiniband / sw / siw / siw_qp_rx.c
blob: fd721cc19682eb2ca510315abb4e3ab60f2f8116 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
/* Copyright (c) 2008-2019, IBM Corporation */
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/net.h>
#include <linux/scatterlist.h>
#include <linux/highmem.h>
#include <rdma/iw_cm.h>
#include <rdma/ib_verbs.h>
#include "siw.h"
#include "siw_verbs.h"
#include "siw_mem.h"
/*
* siw_rx_umem()
*
* Receive data of @len into target referenced by @dest_addr.
*
* @srx: Receive Context
* @umem: siw representation of target memory
* @dest_addr: user virtual address
* @len: number of bytes to place
*/
static int siw_rx_umem(struct siw_rx_stream *srx, struct siw_umem *umem,
u64 dest_addr, int len)
{
int copied = 0;
while (len) {
struct page *p;
int pg_off, bytes, rv;
void *dest;
p = siw_get_upage(umem, dest_addr);
if (unlikely(!p)) {
pr_warn("siw: %s: [QP %u]: bogus addr: %pK, %pK\n",
__func__, qp_id(rx_qp(srx)),
(void *)(uintptr_t)dest_addr,
(void *)(uintptr_t)umem->fp_addr);
/* siw internal error */
srx->skb_copied += copied;
srx->skb_new -= copied;
return -EFAULT;
}
pg_off = dest_addr & ~PAGE_MASK;
bytes = min(len, (int)PAGE_SIZE - pg_off);
siw_dbg_qp(rx_qp(srx), "page %pK, bytes=%u\n", p, bytes);
dest = kmap_atomic(p);
rv = skb_copy_bits(srx->skb, srx->skb_offset, dest + pg_off,
bytes);
if (unlikely(rv)) {
kunmap_atomic(dest);
srx->skb_copied += copied;
srx->skb_new -= copied;
pr_warn("siw: [QP %u]: %s, len %d, page %p, rv %d\n",
qp_id(rx_qp(srx)), __func__, len, p, rv);
return -EFAULT;
}
if (srx->mpa_crc_hd) {
if (rdma_is_kernel_res(&rx_qp(srx)->base_qp.res)) {
crypto_shash_update(srx->mpa_crc_hd,
(u8 *)(dest + pg_off), bytes);
kunmap_atomic(dest);
} else {
kunmap_atomic(dest);
/*
* Do CRC on original, not target buffer.
* Some user land applications may
* concurrently write the target buffer,
* which would yield a broken CRC.
* Walking the skb twice is very ineffcient.
* Folding the CRC into skb_copy_bits()
* would be much better, but is currently
* not supported.
*/
siw_crc_skb(srx, bytes);
}
} else {
kunmap_atomic(dest);
}
srx->skb_offset += bytes;
copied += bytes;
len -= bytes;
dest_addr += bytes;
pg_off = 0;
}
srx->skb_copied += copied;
srx->skb_new -= copied;
return copied;
}
static int siw_rx_kva(struct siw_rx_stream *srx, void *kva, int len)
{
int rv;
siw_dbg_qp(rx_qp(srx), "kva: 0x%pK, len: %u\n", kva, len);
rv = skb_copy_bits(srx->skb, srx->skb_offset, kva, len);
if (unlikely(rv)) {
pr_warn("siw: [QP %u]: %s, len %d, kva 0x%pK, rv %d\n",
qp_id(rx_qp(srx)), __func__, len, kva, rv);
return rv;
}
if (srx->mpa_crc_hd)
crypto_shash_update(srx->mpa_crc_hd, (u8 *)kva, len);
srx->skb_offset += len;
srx->skb_copied += len;
srx->skb_new -= len;
return len;
}
static int siw_rx_pbl(struct siw_rx_stream *srx, int *pbl_idx,
struct siw_mem *mem, u64 addr, int len)
{
struct siw_pbl *pbl = mem->pbl;
u64 offset = addr - mem->va;
int copied = 0;
while (len) {
int bytes;
dma_addr_t buf_addr =
siw_pbl_get_buffer(pbl, offset, &bytes, pbl_idx);
if (!buf_addr)
break;
bytes = min(bytes, len);
if (siw_rx_kva(srx, (void *)(uintptr_t)buf_addr, bytes) ==
bytes) {
copied += bytes;
offset += bytes;
len -= bytes;
} else {
break;
}
}
return copied;
}
/*
* siw_rresp_check_ntoh()
*
* Check incoming RRESP fragment header against expected
* header values and update expected values for potential next
* fragment.
*
* NOTE: This function must be called only if a RRESP DDP segment
* starts but not for fragmented consecutive pieces of an
* already started DDP segment.
*/
static int siw_rresp_check_ntoh(struct siw_rx_stream *srx,
struct siw_rx_fpdu *frx)
{
struct iwarp_rdma_rresp *rresp = &srx->hdr.rresp;
struct siw_wqe *wqe = &frx->wqe_active;
enum ddp_ecode ecode;
u32 sink_stag = be32_to_cpu(rresp->sink_stag);
u64 sink_to = be64_to_cpu(rresp->sink_to);
if (frx->first_ddp_seg) {
srx->ddp_stag = wqe->sqe.sge[0].lkey;
srx->ddp_to = wqe->sqe.sge[0].laddr;
frx->pbl_idx = 0;
}
/* Below checks extend beyond the semantics of DDP, and
* into RDMAP:
* We check if the read response matches exactly the
* read request which was send to the remote peer to
* trigger this read response. RFC5040/5041 do not
* always have a proper error code for the detected
* error cases. We choose 'base or bounds error' for
* cases where the inbound STag is valid, but offset
* or length do not match our response receive state.
*/
if (unlikely(srx->ddp_stag != sink_stag)) {
pr_warn("siw: [QP %u]: rresp stag: %08x != %08x\n",
qp_id(rx_qp(srx)), sink_stag, srx->ddp_stag);
ecode = DDP_ECODE_T_INVALID_STAG;
goto error;
}
if (unlikely(srx->ddp_to != sink_to)) {
pr_warn("siw: [QP %u]: rresp off: %016llx != %016llx\n",
qp_id(rx_qp(srx)), (unsigned long long)sink_to,
(unsigned long long)srx->ddp_to);
ecode = DDP_ECODE_T_BASE_BOUNDS;
goto error;
}
if (unlikely(!frx->more_ddp_segs &&
(wqe->processed + srx->fpdu_part_rem != wqe->bytes))) {
pr_warn("siw: [QP %u]: rresp len: %d != %d\n",
qp_id(rx_qp(srx)),
wqe->processed + srx->fpdu_part_rem, wqe->bytes);
ecode = DDP_ECODE_T_BASE_BOUNDS;
goto error;
}
return 0;
error:
siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_DDP,
DDP_ETYPE_TAGGED_BUF, ecode, 0);
return -EINVAL;
}
/*
* siw_write_check_ntoh()
*
* Check incoming WRITE fragment header against expected
* header values and update expected values for potential next
* fragment
*
* NOTE: This function must be called only if a WRITE DDP segment
* starts but not for fragmented consecutive pieces of an
* already started DDP segment.
*/
static int siw_write_check_ntoh(struct siw_rx_stream *srx,
struct siw_rx_fpdu *frx)
{
struct iwarp_rdma_write *write = &srx->hdr.rwrite;
enum ddp_ecode ecode;
u32 sink_stag = be32_to_cpu(write->sink_stag);
u64 sink_to = be64_to_cpu(write->sink_to);
if (frx->first_ddp_seg) {
srx->ddp_stag = sink_stag;
srx->ddp_to = sink_to;
frx->pbl_idx = 0;
} else {
if (unlikely(srx->ddp_stag != sink_stag)) {
pr_warn("siw: [QP %u]: write stag: %08x != %08x\n",
qp_id(rx_qp(srx)), sink_stag,
srx->ddp_stag);
ecode = DDP_ECODE_T_INVALID_STAG;
goto error;
}
if (unlikely(srx->ddp_to != sink_to)) {
pr_warn("siw: [QP %u]: write off: %016llx != %016llx\n",
qp_id(rx_qp(srx)),
(unsigned long long)sink_to,
(unsigned long long)srx->ddp_to);
ecode = DDP_ECODE_T_BASE_BOUNDS;
goto error;
}
}
return 0;
error:
siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_DDP,
DDP_ETYPE_TAGGED_BUF, ecode, 0);
return -EINVAL;
}
/*
* siw_send_check_ntoh()
*
* Check incoming SEND fragment header against expected
* header values and update expected MSN if no next
* fragment expected
*
* NOTE: This function must be called only if a SEND DDP segment
* starts but not for fragmented consecutive pieces of an
* already started DDP segment.
*/
static int siw_send_check_ntoh(struct siw_rx_stream *srx,
struct siw_rx_fpdu *frx)
{
struct iwarp_send_inv *send = &srx->hdr.send_inv;
struct siw_wqe *wqe = &frx->wqe_active;
enum ddp_ecode ecode;
u32 ddp_msn = be32_to_cpu(send->ddp_msn);
u32 ddp_mo = be32_to_cpu(send->ddp_mo);
u32 ddp_qn = be32_to_cpu(send->ddp_qn);
if (unlikely(ddp_qn != RDMAP_UNTAGGED_QN_SEND)) {
pr_warn("siw: [QP %u]: invalid ddp qn %d for send\n",
qp_id(rx_qp(srx)), ddp_qn);
ecode = DDP_ECODE_UT_INVALID_QN;
goto error;
}
if (unlikely(ddp_msn != srx->ddp_msn[RDMAP_UNTAGGED_QN_SEND])) {
pr_warn("siw: [QP %u]: send msn: %u != %u\n",
qp_id(rx_qp(srx)), ddp_msn,
srx->ddp_msn[RDMAP_UNTAGGED_QN_SEND]);
ecode = DDP_ECODE_UT_INVALID_MSN_RANGE;
goto error;
}
if (unlikely(ddp_mo != wqe->processed)) {
pr_warn("siw: [QP %u], send mo: %u != %u\n",
qp_id(rx_qp(srx)), ddp_mo, wqe->processed);
ecode = DDP_ECODE_UT_INVALID_MO;
goto error;
}
if (frx->first_ddp_seg) {
/* initialize user memory write position */
frx->sge_idx = 0;
frx->sge_off = 0;
frx->pbl_idx = 0;
/* only valid for SEND_INV and SEND_SE_INV operations */
srx->inval_stag = be32_to_cpu(send->inval_stag);
}
if (unlikely(wqe->bytes < wqe->processed + srx->fpdu_part_rem)) {
siw_dbg_qp(rx_qp(srx), "receive space short: %d - %d < %d\n",
wqe->bytes, wqe->processed, srx->fpdu_part_rem);
wqe->wc_status = SIW_WC_LOC_LEN_ERR;
ecode = DDP_ECODE_UT_INVALID_MSN_NOBUF;
goto error;
}
return 0;
error:
siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_DDP,
DDP_ETYPE_UNTAGGED_BUF, ecode, 0);
return -EINVAL;
}
static struct siw_wqe *siw_rqe_get(struct siw_qp *qp)
{
struct siw_rqe *rqe;
struct siw_srq *srq;
struct siw_wqe *wqe = NULL;
bool srq_event = false;
unsigned long flags;
srq = qp->srq;
if (srq) {
spin_lock_irqsave(&srq->lock, flags);
if (unlikely(!srq->num_rqe))
goto out;
rqe = &srq->recvq[srq->rq_get % srq->num_rqe];
} else {
if (unlikely(!qp->recvq))
goto out;
rqe = &qp->recvq[qp->rq_get % qp->attrs.rq_size];
}
if (likely(rqe->flags == SIW_WQE_VALID)) {
int num_sge = rqe->num_sge;
if (likely(num_sge <= SIW_MAX_SGE)) {
int i = 0;
wqe = rx_wqe(&qp->rx_untagged);
rx_type(wqe) = SIW_OP_RECEIVE;
wqe->wr_status = SIW_WR_INPROGRESS;
wqe->bytes = 0;
wqe->processed = 0;
wqe->rqe.id = rqe->id;
wqe->rqe.num_sge = num_sge;
while (i < num_sge) {
wqe->rqe.sge[i].laddr = rqe->sge[i].laddr;
wqe->rqe.sge[i].lkey = rqe->sge[i].lkey;
wqe->rqe.sge[i].length = rqe->sge[i].length;
wqe->bytes += wqe->rqe.sge[i].length;
wqe->mem[i] = NULL;
i++;
}
/* can be re-used by appl */
smp_store_mb(rqe->flags, 0);
} else {
siw_dbg_qp(qp, "too many sge's: %d\n", rqe->num_sge);
if (srq)
spin_unlock_irqrestore(&srq->lock, flags);
return NULL;
}
if (!srq) {
qp->rq_get++;
} else {
if (srq->armed) {
/* Test SRQ limit */
u32 off = (srq->rq_get + srq->limit) %
srq->num_rqe;
struct siw_rqe *rqe2 = &srq->recvq[off];
if (!(rqe2->flags & SIW_WQE_VALID)) {
srq->armed = false;
srq_event = true;
}
}
srq->rq_get++;
}
}
out:
if (srq) {
spin_unlock_irqrestore(&srq->lock, flags);
if (srq_event)
siw_srq_event(srq, IB_EVENT_SRQ_LIMIT_REACHED);
}
return wqe;
}
/*
* siw_proc_send:
*
* Process one incoming SEND and place data into memory referenced by
* receive wqe.
*
* Function supports partially received sends (suspending/resuming
* current receive wqe processing)
*
* return value:
* 0: reached the end of a DDP segment
* -EAGAIN: to be called again to finish the DDP segment
*/
int siw_proc_send(struct siw_qp *qp)
{
struct siw_rx_stream *srx = &qp->rx_stream;
struct siw_rx_fpdu *frx = &qp->rx_untagged;
struct siw_wqe *wqe;
u32 data_bytes; /* all data bytes available */
u32 rcvd_bytes; /* sum of data bytes rcvd */
int rv = 0;
if (frx->first_ddp_seg) {
wqe = siw_rqe_get(qp);
if (unlikely(!wqe)) {
siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
DDP_ETYPE_UNTAGGED_BUF,
DDP_ECODE_UT_INVALID_MSN_NOBUF, 0);
return -ENOENT;
}
} else {
wqe = rx_wqe(frx);
}
if (srx->state == SIW_GET_DATA_START) {
rv = siw_send_check_ntoh(srx, frx);
if (unlikely(rv)) {
siw_qp_event(qp, IB_EVENT_QP_FATAL);
return rv;
}
if (!srx->fpdu_part_rem) /* zero length SEND */
return 0;
}
data_bytes = min(srx->fpdu_part_rem, srx->skb_new);
rcvd_bytes = 0;
/* A zero length SEND will skip below loop */
while (data_bytes) {
struct ib_pd *pd;
struct siw_mem **mem, *mem_p;
struct siw_sge *sge;
u32 sge_bytes; /* data bytes avail for SGE */
sge = &wqe->rqe.sge[frx->sge_idx];
if (!sge->length) {
/* just skip empty sge's */
frx->sge_idx++;
frx->sge_off = 0;
frx->pbl_idx = 0;
continue;
}
sge_bytes = min(data_bytes, sge->length - frx->sge_off);
mem = &wqe->mem[frx->sge_idx];
/*
* check with QP's PD if no SRQ present, SRQ's PD otherwise
*/
pd = qp->srq == NULL ? qp->pd : qp->srq->base_srq.pd;
rv = siw_check_sge(pd, sge, mem, IB_ACCESS_LOCAL_WRITE,
frx->sge_off, sge_bytes);
if (unlikely(rv)) {
siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
DDP_ETYPE_CATASTROPHIC,
DDP_ECODE_CATASTROPHIC, 0);
siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR);
break;
}
mem_p = *mem;
if (mem_p->mem_obj == NULL)
rv = siw_rx_kva(srx,
(void *)(uintptr_t)(sge->laddr + frx->sge_off),
sge_bytes);
else if (!mem_p->is_pbl)
rv = siw_rx_umem(srx, mem_p->umem,
sge->laddr + frx->sge_off, sge_bytes);
else
rv = siw_rx_pbl(srx, &frx->pbl_idx, mem_p,
sge->laddr + frx->sge_off, sge_bytes);
if (unlikely(rv != sge_bytes)) {
wqe->processed += rcvd_bytes;
siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
DDP_ETYPE_CATASTROPHIC,
DDP_ECODE_CATASTROPHIC, 0);
return -EINVAL;
}
frx->sge_off += rv;
if (frx->sge_off == sge->length) {
frx->sge_idx++;
frx->sge_off = 0;
frx->pbl_idx = 0;
}
data_bytes -= rv;
rcvd_bytes += rv;
srx->fpdu_part_rem -= rv;
srx->fpdu_part_rcvd += rv;
}
wqe->processed += rcvd_bytes;
if (!srx->fpdu_part_rem)
return 0;
return (rv < 0) ? rv : -EAGAIN;
}
/*
* siw_proc_write:
*
* Place incoming WRITE after referencing and checking target buffer
* Function supports partially received WRITEs (suspending/resuming
* current receive processing)
*
* return value:
* 0: reached the end of a DDP segment
* -EAGAIN: to be called again to finish the DDP segment
*/
int siw_proc_write(struct siw_qp *qp)
{
struct siw_rx_stream *srx = &qp->rx_stream;
struct siw_rx_fpdu *frx = &qp->rx_tagged;
struct siw_mem *mem;
int bytes, rv;
if (srx->state == SIW_GET_DATA_START) {
if (!srx->fpdu_part_rem) /* zero length WRITE */
return 0;
rv = siw_write_check_ntoh(srx, frx);
if (unlikely(rv)) {
siw_qp_event(qp, IB_EVENT_QP_FATAL);
return rv;
}
}
bytes = min(srx->fpdu_part_rem, srx->skb_new);
if (frx->first_ddp_seg) {
struct siw_wqe *wqe = rx_wqe(frx);
rx_mem(frx) = siw_mem_id2obj(qp->sdev, srx->ddp_stag >> 8);
if (unlikely(!rx_mem(frx))) {
siw_dbg_qp(qp,
"sink stag not found/invalid, stag 0x%08x\n",
srx->ddp_stag);
siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
DDP_ETYPE_TAGGED_BUF,
DDP_ECODE_T_INVALID_STAG, 0);
return -EINVAL;
}
wqe->rqe.num_sge = 1;
rx_type(wqe) = SIW_OP_WRITE;
wqe->wr_status = SIW_WR_INPROGRESS;
}
mem = rx_mem(frx);
/*
* Check if application re-registered memory with different
* key field of STag.
*/
if (unlikely(mem->stag != srx->ddp_stag)) {
siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
DDP_ETYPE_TAGGED_BUF,
DDP_ECODE_T_INVALID_STAG, 0);
return -EINVAL;
}
rv = siw_check_mem(qp->pd, mem, srx->ddp_to + srx->fpdu_part_rcvd,
IB_ACCESS_REMOTE_WRITE, bytes);
if (unlikely(rv)) {
siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
DDP_ETYPE_TAGGED_BUF, siw_tagged_error(-rv),
0);
siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR);
return -EINVAL;
}
if (mem->mem_obj == NULL)
rv = siw_rx_kva(srx,
(void *)(uintptr_t)(srx->ddp_to + srx->fpdu_part_rcvd),
bytes);
else if (!mem->is_pbl)
rv = siw_rx_umem(srx, mem->umem,
srx->ddp_to + srx->fpdu_part_rcvd, bytes);
else
rv = siw_rx_pbl(srx, &frx->pbl_idx, mem,
srx->ddp_to + srx->fpdu_part_rcvd, bytes);
if (unlikely(rv != bytes)) {
siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
DDP_ETYPE_CATASTROPHIC,
DDP_ECODE_CATASTROPHIC, 0);
return -EINVAL;
}
srx->fpdu_part_rem -= rv;
srx->fpdu_part_rcvd += rv;
if (!srx->fpdu_part_rem) {
srx->ddp_to += srx->fpdu_part_rcvd;
return 0;
}
return -EAGAIN;
}
/*
* Inbound RREQ's cannot carry user data.
*/
int siw_proc_rreq(struct siw_qp *qp)
{
struct siw_rx_stream *srx = &qp->rx_stream;
if (!srx->fpdu_part_rem)
return 0;
pr_warn("siw: [QP %u]: rreq with mpa len %d\n", qp_id(qp),
be16_to_cpu(srx->hdr.ctrl.mpa_len));
return -EPROTO;
}
/*
* siw_init_rresp:
*
* Process inbound RDMA READ REQ. Produce a pseudo READ RESPONSE WQE.
* Put it at the tail of the IRQ, if there is another WQE currently in
* transmit processing. If not, make it the current WQE to be processed
* and schedule transmit processing.
*
* Can be called from softirq context and from process
* context (RREAD socket loopback case!)
*
* return value:
* 0: success,
* failure code otherwise
*/
static int siw_init_rresp(struct siw_qp *qp, struct siw_rx_stream *srx)
{
struct siw_wqe *tx_work = tx_wqe(qp);
struct siw_sqe *resp;
uint64_t raddr = be64_to_cpu(srx->hdr.rreq.sink_to),
laddr = be64_to_cpu(srx->hdr.rreq.source_to);
uint32_t length = be32_to_cpu(srx->hdr.rreq.read_size),
lkey = be32_to_cpu(srx->hdr.rreq.source_stag),
rkey = be32_to_cpu(srx->hdr.rreq.sink_stag),
msn = be32_to_cpu(srx->hdr.rreq.ddp_msn);
int run_sq = 1, rv = 0;
unsigned long flags;
if (unlikely(msn != srx->ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ])) {
siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
DDP_ETYPE_UNTAGGED_BUF,
DDP_ECODE_UT_INVALID_MSN_RANGE, 0);
return -EPROTO;
}
spin_lock_irqsave(&qp->sq_lock, flags);
if (unlikely(!qp->attrs.irq_size)) {
run_sq = 0;
goto error_irq;
}
if (tx_work->wr_status == SIW_WR_IDLE) {
/*
* immediately schedule READ response w/o
* consuming IRQ entry: IRQ must be empty.
*/
tx_work->processed = 0;
tx_work->mem[0] = NULL;
tx_work->wr_status = SIW_WR_QUEUED;
resp = &tx_work->sqe;
} else {
resp = irq_alloc_free(qp);
run_sq = 0;
}
if (likely(resp)) {
resp->opcode = SIW_OP_READ_RESPONSE;
resp->sge[0].length = length;
resp->sge[0].laddr = laddr;
resp->sge[0].lkey = lkey;
/* Keep aside message sequence number for potential
* error reporting during Read Response generation.
*/
resp->sge[1].length = msn;
resp->raddr = raddr;
resp->rkey = rkey;
resp->num_sge = length ? 1 : 0;
/* RRESP now valid as current TX wqe or placed into IRQ */
smp_store_mb(resp->flags, SIW_WQE_VALID);
} else {
error_irq:
pr_warn("siw: [QP %u]: IRQ exceeded or null, size %d\n",
qp_id(qp), qp->attrs.irq_size);
siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP,
RDMAP_ETYPE_REMOTE_OPERATION,
RDMAP_ECODE_CATASTROPHIC_STREAM, 0);
rv = -EPROTO;
}
spin_unlock_irqrestore(&qp->sq_lock, flags);
if (run_sq)
rv = siw_sq_start(qp);
return rv;
}
/*
* Only called at start of Read.Resonse processing.
* Transfer pending Read from tip of ORQ into currrent rx wqe,
* but keep ORQ entry valid until Read.Response processing done.
* No Queue locking needed.
*/
static int siw_orqe_start_rx(struct siw_qp *qp)
{
struct siw_sqe *orqe;
struct siw_wqe *wqe = NULL;
if (unlikely(!qp->attrs.orq_size))
return -EPROTO;
/* make sure ORQ indices are current */
smp_mb();
orqe = orq_get_current(qp);
if (READ_ONCE(orqe->flags) & SIW_WQE_VALID) {
/* RRESP is a TAGGED RDMAP operation */
wqe = rx_wqe(&qp->rx_tagged);
wqe->sqe.id = orqe->id;
wqe->sqe.opcode = orqe->opcode;
wqe->sqe.sge[0].laddr = orqe->sge[0].laddr;
wqe->sqe.sge[0].lkey = orqe->sge[0].lkey;
wqe->sqe.sge[0].length = orqe->sge[0].length;
wqe->sqe.flags = orqe->flags;
wqe->sqe.num_sge = 1;
wqe->bytes = orqe->sge[0].length;
wqe->processed = 0;
wqe->mem[0] = NULL;
/* make sure WQE is completely written before valid */
smp_wmb();
wqe->wr_status = SIW_WR_INPROGRESS;
return 0;
}
return -EPROTO;
}
/*
* siw_proc_rresp:
*
* Place incoming RRESP data into memory referenced by RREQ WQE
* which is at the tip of the ORQ
*
* Function supports partially received RRESP's (suspending/resuming
* current receive processing)
*/
int siw_proc_rresp(struct siw_qp *qp)
{
struct siw_rx_stream *srx = &qp->rx_stream;
struct siw_rx_fpdu *frx = &qp->rx_tagged;
struct siw_wqe *wqe = rx_wqe(frx);
struct siw_mem **mem, *mem_p;
struct siw_sge *sge;
int bytes, rv;
if (frx->first_ddp_seg) {
if (unlikely(wqe->wr_status != SIW_WR_IDLE)) {
pr_warn("siw: [QP %u]: proc RRESP: status %d, op %d\n",
qp_id(qp), wqe->wr_status, wqe->sqe.opcode);
rv = -EPROTO;
goto error_term;
}
/*
* fetch pending RREQ from orq
*/
rv = siw_orqe_start_rx(qp);
if (rv) {
pr_warn("siw: [QP %u]: ORQ empty, size %d\n",
qp_id(qp), qp->attrs.orq_size);
goto error_term;
}
rv = siw_rresp_check_ntoh(srx, frx);
if (unlikely(rv)) {
siw_qp_event(qp, IB_EVENT_QP_FATAL);
return rv;
}
} else {
if (unlikely(wqe->wr_status != SIW_WR_INPROGRESS)) {
pr_warn("siw: [QP %u]: resume RRESP: status %d\n",
qp_id(qp), wqe->wr_status);
rv = -EPROTO;
goto error_term;
}
}
if (!srx->fpdu_part_rem) /* zero length RRESPONSE */
return 0;
sge = wqe->sqe.sge; /* there is only one */
mem = &wqe->mem[0];
if (!(*mem)) {
/*
* check target memory which resolves memory on first fragment
*/
rv = siw_check_sge(qp->pd, sge, mem, IB_ACCESS_LOCAL_WRITE, 0,
wqe->bytes);
if (unlikely(rv)) {
siw_dbg_qp(qp, "target mem check: %d\n", rv);
wqe->wc_status = SIW_WC_LOC_PROT_ERR;
siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
DDP_ETYPE_TAGGED_BUF,
siw_tagged_error(-rv), 0);
siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR);
return -EINVAL;
}
}
mem_p = *mem;
bytes = min(srx->fpdu_part_rem, srx->skb_new);
if (mem_p->mem_obj == NULL)
rv = siw_rx_kva(srx,
(void *)(uintptr_t)(sge->laddr + wqe->processed),
bytes);
else if (!mem_p->is_pbl)
rv = siw_rx_umem(srx, mem_p->umem, sge->laddr + wqe->processed,
bytes);
else
rv = siw_rx_pbl(srx, &frx->pbl_idx, mem_p,
sge->laddr + wqe->processed, bytes);
if (rv != bytes) {
wqe->wc_status = SIW_WC_GENERAL_ERR;
rv = -EINVAL;
goto error_term;
}
srx->fpdu_part_rem -= rv;
srx->fpdu_part_rcvd += rv;
wqe->processed += rv;
if (!srx->fpdu_part_rem) {
srx->ddp_to += srx->fpdu_part_rcvd;
return 0;
}
return -EAGAIN;
error_term:
siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, DDP_ETYPE_CATASTROPHIC,
DDP_ECODE_CATASTROPHIC, 0);
return rv;
}
int siw_proc_terminate(struct siw_qp *qp)
{
struct siw_rx_stream *srx = &qp->rx_stream;
struct sk_buff *skb = srx->skb;
struct iwarp_terminate *term = &srx->hdr.terminate;
union iwarp_hdr term_info;
u8 *infop = (u8 *)&term_info;
enum rdma_opcode op;
u16 to_copy = sizeof(struct iwarp_ctrl);
pr_warn("siw: got TERMINATE. layer %d, type %d, code %d\n",
__rdmap_term_layer(term), __rdmap_term_etype(term),
__rdmap_term_ecode(term));
if (be32_to_cpu(term->ddp_qn) != RDMAP_UNTAGGED_QN_TERMINATE ||
be32_to_cpu(term->ddp_msn) !=
qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_TERMINATE] ||
be32_to_cpu(term->ddp_mo) != 0) {
pr_warn("siw: rx bogus TERM [QN x%08x, MSN x%08x, MO x%08x]\n",
be32_to_cpu(term->ddp_qn), be32_to_cpu(term->ddp_msn),
be32_to_cpu(term->ddp_mo));
return -ECONNRESET;
}
/*
* Receive remaining pieces of TERM if indicated
*/
if (!term->flag_m)
return -ECONNRESET;
/* Do not take the effort to reassemble a network fragmented
* TERM message
*/
if (srx->skb_new < sizeof(struct iwarp_ctrl_tagged))
return -ECONNRESET;
memset(infop, 0, sizeof(term_info));
skb_copy_bits(skb, srx->skb_offset, infop, to_copy);
op = __rdmap_get_opcode(&term_info.ctrl);
if (op >= RDMAP_TERMINATE)
goto out;
infop += to_copy;
srx->skb_offset += to_copy;
srx->skb_new -= to_copy;
srx->skb_copied += to_copy;
srx->fpdu_part_rcvd += to_copy;
srx->fpdu_part_rem -= to_copy;
to_copy = iwarp_pktinfo[op].hdr_len - to_copy;
/* Again, no network fragmented TERM's */
if (to_copy + MPA_CRC_SIZE > srx->skb_new)
return -ECONNRESET;
skb_copy_bits(skb, srx->skb_offset, infop, to_copy);
if (term->flag_r) {
siw_dbg_qp(qp, "TERM reports RDMAP hdr type %u, len %u (%s)\n",
op, be16_to_cpu(term_info.ctrl.mpa_len),
term->flag_m ? "valid" : "invalid");
} else if (term->flag_d) {
siw_dbg_qp(qp, "TERM reports DDP hdr type %u, len %u (%s)\n",
op, be16_to_cpu(term_info.ctrl.mpa_len),
term->flag_m ? "valid" : "invalid");
}
out:
srx->skb_new -= to_copy;
srx->skb_offset += to_copy;
srx->skb_copied += to_copy;
srx->fpdu_part_rcvd += to_copy;
srx->fpdu_part_rem -= to_copy;
return -ECONNRESET;
}
static int siw_get_trailer(struct siw_qp *qp, struct siw_rx_stream *srx)
{
struct sk_buff *skb = srx->skb;
int avail = min(srx->skb_new, srx->fpdu_part_rem);
u8 *tbuf = (u8 *)&srx->trailer.crc - srx->pad;
__wsum crc_in, crc_own = 0;
siw_dbg_qp(qp, "expected %d, available %d, pad %u\n",
srx->fpdu_part_rem, srx->skb_new, srx->pad);
skb_copy_bits(skb, srx->skb_offset, tbuf, avail);
srx->skb_new -= avail;
srx->skb_offset += avail;
srx->skb_copied += avail;
srx->fpdu_part_rem -= avail;
if (srx->fpdu_part_rem)
return -EAGAIN;
if (!srx->mpa_crc_hd)
return 0;
if (srx->pad)
crypto_shash_update(srx->mpa_crc_hd, tbuf, srx->pad);
/*
* CRC32 is computed, transmitted and received directly in NBO,
* so there's never a reason to convert byte order.
*/
crypto_shash_final(srx->mpa_crc_hd, (u8 *)&crc_own);
crc_in = (__force __wsum)srx->trailer.crc;
if (unlikely(crc_in != crc_own)) {
pr_warn("siw: crc error. in: %08x, own %08x, op %u\n",
crc_in, crc_own, qp->rx_stream.rdmap_op);
siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
LLP_ETYPE_MPA,
LLP_ECODE_RECEIVED_CRC, 0);
return -EINVAL;
}
return 0;
}
#define MIN_DDP_HDR sizeof(struct iwarp_ctrl_tagged)
static int siw_get_hdr(struct siw_rx_stream *srx)
{
struct sk_buff *skb = srx->skb;
struct siw_qp *qp = rx_qp(srx);
struct iwarp_ctrl *c_hdr = &srx->hdr.ctrl;
struct siw_rx_fpdu *frx;
u8 opcode;
int bytes;
if (srx->fpdu_part_rcvd < MIN_DDP_HDR) {
/*
* copy a mimimum sized (tagged) DDP frame control part
*/
bytes = min_t(int, srx->skb_new,
MIN_DDP_HDR - srx->fpdu_part_rcvd);
skb_copy_bits(skb, srx->skb_offset,
(char *)c_hdr + srx->fpdu_part_rcvd, bytes);
srx->fpdu_part_rcvd += bytes;
srx->skb_new -= bytes;
srx->skb_offset += bytes;
srx->skb_copied += bytes;
if (srx->fpdu_part_rcvd < MIN_DDP_HDR)
return -EAGAIN;
if (unlikely(__ddp_get_version(c_hdr) != DDP_VERSION)) {
enum ddp_etype etype;
enum ddp_ecode ecode;
pr_warn("siw: received ddp version unsupported %d\n",
__ddp_get_version(c_hdr));
if (c_hdr->ddp_rdmap_ctrl & DDP_FLAG_TAGGED) {
etype = DDP_ETYPE_TAGGED_BUF;
ecode = DDP_ECODE_T_VERSION;
} else {
etype = DDP_ETYPE_UNTAGGED_BUF;
ecode = DDP_ECODE_UT_VERSION;
}
siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_DDP,
etype, ecode, 0);
return -EINVAL;
}
if (unlikely(__rdmap_get_version(c_hdr) != RDMAP_VERSION)) {
pr_warn("siw: received rdmap version unsupported %d\n",
__rdmap_get_version(c_hdr));
siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_RDMAP,
RDMAP_ETYPE_REMOTE_OPERATION,
RDMAP_ECODE_VERSION, 0);
return -EINVAL;
}
opcode = __rdmap_get_opcode(c_hdr);
if (opcode > RDMAP_TERMINATE) {
pr_warn("siw: received unknown packet type %u\n",
opcode);
siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_RDMAP,
RDMAP_ETYPE_REMOTE_OPERATION,
RDMAP_ECODE_OPCODE, 0);
return -EINVAL;
}
siw_dbg_qp(rx_qp(srx), "new header, opcode %u\n", opcode);
} else {
opcode = __rdmap_get_opcode(c_hdr);
}
set_rx_fpdu_context(qp, opcode);
frx = qp->rx_fpdu;
/*
* Figure out len of current hdr: variable length of
* iwarp hdr may force us to copy hdr information in
* two steps. Only tagged DDP messages are already
* completely received.
*/
if (iwarp_pktinfo[opcode].hdr_len > sizeof(struct iwarp_ctrl_tagged)) {
int hdrlen = iwarp_pktinfo[opcode].hdr_len;
bytes = min_t(int, hdrlen - MIN_DDP_HDR, srx->skb_new);
skb_copy_bits(skb, srx->skb_offset,
(char *)c_hdr + srx->fpdu_part_rcvd, bytes);
srx->fpdu_part_rcvd += bytes;
srx->skb_new -= bytes;
srx->skb_offset += bytes;
srx->skb_copied += bytes;
if (srx->fpdu_part_rcvd < hdrlen)
return -EAGAIN;
}
/*
* DDP/RDMAP header receive completed. Check if the current
* DDP segment starts a new RDMAP message or continues a previously
* started RDMAP message.
*
* Alternating reception of DDP segments (or FPDUs) from incomplete
* tagged and untagged RDMAP messages is supported, as long as
* the current tagged or untagged message gets eventually completed
* w/o intersection from another message of the same type
* (tagged/untagged). E.g., a WRITE can get intersected by a SEND,
* but not by a READ RESPONSE etc.
*/
if (srx->mpa_crc_hd) {
/*
* Restart CRC computation
*/
crypto_shash_init(srx->mpa_crc_hd);
crypto_shash_update(srx->mpa_crc_hd, (u8 *)c_hdr,
srx->fpdu_part_rcvd);
}
if (frx->more_ddp_segs) {
frx->first_ddp_seg = 0;
if (frx->prev_rdmap_op != opcode) {
pr_warn("siw: packet intersection: %u : %u\n",
frx->prev_rdmap_op, opcode);
/*
* The last inbound RDMA operation of same type
* (tagged or untagged) is left unfinished.
* To complete it in error, make it the current
* operation again, even with the header already
* overwritten. For error handling, only the opcode
* and current rx context are relevant.
*/
set_rx_fpdu_context(qp, frx->prev_rdmap_op);
__rdmap_set_opcode(c_hdr, frx->prev_rdmap_op);
return -EPROTO;
}
} else {
frx->prev_rdmap_op = opcode;
frx->first_ddp_seg = 1;
}
frx->more_ddp_segs = c_hdr->ddp_rdmap_ctrl & DDP_FLAG_LAST ? 0 : 1;
return 0;
}
static int siw_check_tx_fence(struct siw_qp *qp)
{
struct siw_wqe *tx_waiting = tx_wqe(qp);
struct siw_sqe *rreq;
int resume_tx = 0, rv = 0;
unsigned long flags;
spin_lock_irqsave(&qp->orq_lock, flags);
/* free current orq entry */
rreq = orq_get_current(qp);
WRITE_ONCE(rreq->flags, 0);
qp->orq_get++;
if (qp->tx_ctx.orq_fence) {
if (unlikely(tx_waiting->wr_status != SIW_WR_QUEUED)) {
pr_warn("siw: [QP %u]: fence resume: bad status %d\n",
qp_id(qp), tx_waiting->wr_status);
rv = -EPROTO;
goto out;
}
/* resume SQ processing, if possible */
if (tx_waiting->sqe.opcode == SIW_OP_READ ||
tx_waiting->sqe.opcode == SIW_OP_READ_LOCAL_INV) {
/* SQ processing was stopped because of a full ORQ */
rreq = orq_get_free(qp);
if (unlikely(!rreq)) {
pr_warn("siw: [QP %u]: no ORQE\n", qp_id(qp));
rv = -EPROTO;
goto out;
}
siw_read_to_orq(rreq, &tx_waiting->sqe);
qp->orq_put++;
qp->tx_ctx.orq_fence = 0;
resume_tx = 1;
} else if (siw_orq_empty(qp)) {
/*
* SQ processing was stopped by fenced work request.
* Resume since all previous Read's are now completed.
*/
qp->tx_ctx.orq_fence = 0;
resume_tx = 1;
}
}
out:
spin_unlock_irqrestore(&qp->orq_lock, flags);
if (resume_tx)
rv = siw_sq_start(qp);
return rv;
}
/*
* siw_rdmap_complete()
*
* Complete processing of an RDMA message after receiving all
* DDP segmens or ABort processing after encountering error case.
*
* o SENDs + RRESPs will need for completion,
* o RREQs need for READ RESPONSE initialization
* o WRITEs need memory dereferencing
*
* TODO: Failed WRITEs need local error to be surfaced.
*/
static int siw_rdmap_complete(struct siw_qp *qp, int error)
{
struct siw_rx_stream *srx = &qp->rx_stream;
struct siw_wqe *wqe = rx_wqe(qp->rx_fpdu);
enum siw_wc_status wc_status = wqe->wc_status;
u8 opcode = __rdmap_get_opcode(&srx->hdr.ctrl);
int rv = 0;
switch (opcode) {
case RDMAP_SEND_SE:
case RDMAP_SEND_SE_INVAL:
wqe->rqe.flags |= SIW_WQE_SOLICITED;
fallthrough;
case RDMAP_SEND:
case RDMAP_SEND_INVAL:
if (wqe->wr_status == SIW_WR_IDLE)
break;
srx->ddp_msn[RDMAP_UNTAGGED_QN_SEND]++;
if (error != 0 && wc_status == SIW_WC_SUCCESS)
wc_status = SIW_WC_GENERAL_ERR;
/*
* Handle STag invalidation request
*/
if (wc_status == SIW_WC_SUCCESS &&
(opcode == RDMAP_SEND_INVAL ||
opcode == RDMAP_SEND_SE_INVAL)) {
rv = siw_invalidate_stag(qp->pd, srx->inval_stag);
if (rv) {
siw_init_terminate(
qp, TERM_ERROR_LAYER_RDMAP,
rv == -EACCES ?
RDMAP_ETYPE_REMOTE_PROTECTION :
RDMAP_ETYPE_REMOTE_OPERATION,
RDMAP_ECODE_CANNOT_INVALIDATE, 0);
wc_status = SIW_WC_REM_INV_REQ_ERR;
}
rv = siw_rqe_complete(qp, &wqe->rqe, wqe->processed,
rv ? 0 : srx->inval_stag,
wc_status);
} else {
rv = siw_rqe_complete(qp, &wqe->rqe, wqe->processed,
0, wc_status);
}
siw_wqe_put_mem(wqe, SIW_OP_RECEIVE);
break;
case RDMAP_RDMA_READ_RESP:
if (wqe->wr_status == SIW_WR_IDLE)
break;
if (error != 0) {
if ((srx->state == SIW_GET_HDR &&
qp->rx_fpdu->first_ddp_seg) || error == -ENODATA)
/* possible RREQ in ORQ left untouched */
break;
if (wc_status == SIW_WC_SUCCESS)
wc_status = SIW_WC_GENERAL_ERR;
} else if (rdma_is_kernel_res(&qp->base_qp.res) &&
rx_type(wqe) == SIW_OP_READ_LOCAL_INV) {
/*
* Handle any STag invalidation request
*/
rv = siw_invalidate_stag(qp->pd, wqe->sqe.sge[0].lkey);
if (rv) {
siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP,
RDMAP_ETYPE_CATASTROPHIC,
RDMAP_ECODE_UNSPECIFIED, 0);
if (wc_status == SIW_WC_SUCCESS) {
wc_status = SIW_WC_GENERAL_ERR;
error = rv;
}
}
}
/*
* All errors turn the wqe into signalled.
*/
if ((wqe->sqe.flags & SIW_WQE_SIGNALLED) || error != 0)
rv = siw_sqe_complete(qp, &wqe->sqe, wqe->processed,
wc_status);
siw_wqe_put_mem(wqe, SIW_OP_READ);
if (!error) {
rv = siw_check_tx_fence(qp);
} else {
/* Disable current ORQ element */
if (qp->attrs.orq_size)
WRITE_ONCE(orq_get_current(qp)->flags, 0);
}
break;
case RDMAP_RDMA_READ_REQ:
if (!error) {
rv = siw_init_rresp(qp, srx);
srx->ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ]++;
}
break;
case RDMAP_RDMA_WRITE:
if (wqe->wr_status == SIW_WR_IDLE)
break;
/*
* Free References from memory object if
* attached to receive context (inbound WRITE).
* While a zero-length WRITE is allowed,
* no memory reference got created.
*/
if (rx_mem(&qp->rx_tagged)) {
siw_mem_put(rx_mem(&qp->rx_tagged));
rx_mem(&qp->rx_tagged) = NULL;
}
break;
default:
break;
}
wqe->wr_status = SIW_WR_IDLE;
return rv;
}
/*
* siw_tcp_rx_data()
*
* Main routine to consume inbound TCP payload
*
* @rd_desc: read descriptor
* @skb: socket buffer
* @off: offset in skb
* @len: skb->len - offset : payload in skb
*/
int siw_tcp_rx_data(read_descriptor_t *rd_desc, struct sk_buff *skb,
unsigned int off, size_t len)
{
struct siw_qp *qp = rd_desc->arg.data;
struct siw_rx_stream *srx = &qp->rx_stream;
int rv;
srx->skb = skb;
srx->skb_new = skb->len - off;
srx->skb_offset = off;
srx->skb_copied = 0;
siw_dbg_qp(qp, "new data, len %d\n", srx->skb_new);
while (srx->skb_new) {
int run_completion = 1;
if (unlikely(srx->rx_suspend)) {
/* Do not process any more data */
srx->skb_copied += srx->skb_new;
break;
}
switch (srx->state) {
case SIW_GET_HDR:
rv = siw_get_hdr(srx);
if (!rv) {
srx->fpdu_part_rem =
be16_to_cpu(srx->hdr.ctrl.mpa_len) -
srx->fpdu_part_rcvd + MPA_HDR_SIZE;
if (srx->fpdu_part_rem)
srx->pad = -srx->fpdu_part_rem & 0x3;
else
srx->pad = 0;
srx->state = SIW_GET_DATA_START;
srx->fpdu_part_rcvd = 0;
}
break;
case SIW_GET_DATA_MORE:
/*
* Another data fragment of the same DDP segment.
* Setting first_ddp_seg = 0 avoids repeating
* initializations that shall occur only once per
* DDP segment.
*/
qp->rx_fpdu->first_ddp_seg = 0;
fallthrough;
case SIW_GET_DATA_START:
/*
* Headers will be checked by the opcode-specific
* data receive function below.
*/
rv = iwarp_pktinfo[qp->rx_stream.rdmap_op].rx_data(qp);
if (!rv) {
int mpa_len =
be16_to_cpu(srx->hdr.ctrl.mpa_len)
+ MPA_HDR_SIZE;
srx->fpdu_part_rem = (-mpa_len & 0x3)
+ MPA_CRC_SIZE;
srx->fpdu_part_rcvd = 0;
srx->state = SIW_GET_TRAILER;
} else {
if (unlikely(rv == -ECONNRESET))
run_completion = 0;
else
srx->state = SIW_GET_DATA_MORE;
}
break;
case SIW_GET_TRAILER:
/*
* read CRC + any padding
*/
rv = siw_get_trailer(qp, srx);
if (likely(!rv)) {
/*
* FPDU completed.
* complete RDMAP message if last fragment
*/
srx->state = SIW_GET_HDR;
srx->fpdu_part_rcvd = 0;
if (!(srx->hdr.ctrl.ddp_rdmap_ctrl &
DDP_FLAG_LAST))
/* more frags */
break;
rv = siw_rdmap_complete(qp, 0);
run_completion = 0;
}
break;
default:
pr_warn("QP[%u]: RX out of state\n", qp_id(qp));
rv = -EPROTO;
run_completion = 0;
}
if (unlikely(rv != 0 && rv != -EAGAIN)) {
if ((srx->state > SIW_GET_HDR ||
qp->rx_fpdu->more_ddp_segs) && run_completion)
siw_rdmap_complete(qp, rv);
siw_dbg_qp(qp, "rx error %d, rx state %d\n", rv,
srx->state);
siw_qp_cm_drop(qp, 1);
break;
}
if (rv) {
siw_dbg_qp(qp, "fpdu fragment, state %d, missing %d\n",
srx->state, srx->fpdu_part_rem);
break;
}
}
return srx->skb_copied;
}