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android-kvm / linux / 5cb69bcacea70024252138a9cb4229a142a93389 / . / drivers / infiniband / hw / cxgb3 / cxio_hal.c
blob: 818cf1aee8c7b1e58bdf1dc229e3b6797799bb0e [file] [log] [blame]
/*
* Copyright (c) 2006 Chelsio, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <asm/delay.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include "cxio_resource.h"
#include "cxio_hal.h"
#include "cxgb3_offload.h"
#include "sge_defs.h"
static LIST_HEAD(rdev_list);
static cxio_hal_ev_callback_func_t cxio_ev_cb = NULL;
static struct cxio_rdev *cxio_hal_find_rdev_by_name(char *dev_name)
{
struct cxio_rdev *rdev;
list_for_each_entry(rdev, &rdev_list, entry)
if (!strcmp(rdev->dev_name, dev_name))
return rdev;
return NULL;
}
static struct cxio_rdev *cxio_hal_find_rdev_by_t3cdev(struct t3cdev *tdev)
{
struct cxio_rdev *rdev;
list_for_each_entry(rdev, &rdev_list, entry)
if (rdev->t3cdev_p == tdev)
return rdev;
return NULL;
}
int cxio_hal_cq_op(struct cxio_rdev *rdev_p, struct t3_cq *cq,
enum t3_cq_opcode op, u32 credit)
{
int ret;
struct t3_cqe *cqe;
u32 rptr;
struct rdma_cq_op setup;
setup.id = cq->cqid;
setup.credits = (op == CQ_CREDIT_UPDATE) ? credit : 0;
setup.op = op;
ret = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_OP, &setup);
if ((ret < 0) || (op == CQ_CREDIT_UPDATE))
return ret;
/*
* If the rearm returned an index other than our current index,
* then there might be CQE's in flight (being DMA'd). We must wait
* here for them to complete or the consumer can miss a notification.
*/
if (Q_PTR2IDX((cq->rptr), cq->size_log2) != ret) {
int i=0;
rptr = cq->rptr;
/*
* Keep the generation correct by bumping rptr until it
* matches the index returned by the rearm - 1.
*/
while (Q_PTR2IDX((rptr+1), cq->size_log2) != ret)
rptr++;
/*
* Now rptr is the index for the (last) cqe that was
* in-flight at the time the HW rearmed the CQ. We
* spin until that CQE is valid.
*/
cqe = cq->queue + Q_PTR2IDX(rptr, cq->size_log2);
while (!CQ_VLD_ENTRY(rptr, cq->size_log2, cqe)) {
udelay(1);
if (i++ > 1000000) {
BUG_ON(1);
printk(KERN_ERR "%s: stalled rnic\n",
rdev_p->dev_name);
return -EIO;
}
}
}
return 0;
}
static int cxio_hal_clear_cq_ctx(struct cxio_rdev *rdev_p, u32 cqid)
{
struct rdma_cq_setup setup;
setup.id = cqid;
setup.base_addr = 0; /* NULL address */
setup.size = 0; /* disaable the CQ */
setup.credits = 0;
setup.credit_thres = 0;
setup.ovfl_mode = 0;
return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
}
static int cxio_hal_clear_qp_ctx(struct cxio_rdev *rdev_p, u32 qpid)
{
u64 sge_cmd;
struct t3_modify_qp_wr *wqe;
struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_KERNEL);
if (!skb) {
PDBG("%s alloc_skb failed\n", __FUNCTION__);
return -ENOMEM;
}
wqe = (struct t3_modify_qp_wr *) skb_put(skb, sizeof(*wqe));
memset(wqe, 0, sizeof(*wqe));
build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_QP_MOD, 3, 1, qpid, 7);
wqe->flags = cpu_to_be32(MODQP_WRITE_EC);
sge_cmd = qpid << 8 | 3;
wqe->sge_cmd = cpu_to_be64(sge_cmd);
skb->priority = CPL_PRIORITY_CONTROL;
return (cxgb3_ofld_send(rdev_p->t3cdev_p, skb));
}
int cxio_create_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
{
struct rdma_cq_setup setup;
int size = (1UL << (cq->size_log2)) * sizeof(struct t3_cqe);
cq->cqid = cxio_hal_get_cqid(rdev_p->rscp);
if (!cq->cqid)
return -ENOMEM;
cq->sw_queue = kzalloc(size, GFP_KERNEL);
if (!cq->sw_queue)
return -ENOMEM;
cq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev),
(1UL << (cq->size_log2)) *
sizeof(struct t3_cqe),
&(cq->dma_addr), GFP_KERNEL);
if (!cq->queue) {
kfree(cq->sw_queue);
return -ENOMEM;
}
pci_unmap_addr_set(cq, mapping, cq->dma_addr);
memset(cq->queue, 0, size);
setup.id = cq->cqid;
setup.base_addr = (u64) (cq->dma_addr);
setup.size = 1UL << cq->size_log2;
setup.credits = 65535;
setup.credit_thres = 1;
if (rdev_p->t3cdev_p->type == T3B)
setup.ovfl_mode = 0;
else
setup.ovfl_mode = 1;
return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
}
int cxio_resize_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
{
struct rdma_cq_setup setup;
setup.id = cq->cqid;
setup.base_addr = (u64) (cq->dma_addr);
setup.size = 1UL << cq->size_log2;
setup.credits = setup.size;
setup.credit_thres = setup.size; /* TBD: overflow recovery */
setup.ovfl_mode = 1;
return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
}
static u32 get_qpid(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
{
struct cxio_qpid_list *entry;
u32 qpid;
int i;
mutex_lock(&uctx->lock);
if (!list_empty(&uctx->qpids)) {
entry = list_entry(uctx->qpids.next, struct cxio_qpid_list,
entry);
list_del(&entry->entry);
qpid = entry->qpid;
kfree(entry);
} else {
qpid = cxio_hal_get_qpid(rdev_p->rscp);
if (!qpid)
goto out;
for (i = qpid+1; i & rdev_p->qpmask; i++) {
entry = kmalloc(sizeof *entry, GFP_KERNEL);
if (!entry)
break;
entry->qpid = i;
list_add_tail(&entry->entry, &uctx->qpids);
}
}
out:
mutex_unlock(&uctx->lock);
PDBG("%s qpid 0x%x\n", __FUNCTION__, qpid);
return qpid;
}
static void put_qpid(struct cxio_rdev *rdev_p, u32 qpid,
struct cxio_ucontext *uctx)
{
struct cxio_qpid_list *entry;
entry = kmalloc(sizeof *entry, GFP_KERNEL);
if (!entry)
return;
PDBG("%s qpid 0x%x\n", __FUNCTION__, qpid);
entry->qpid = qpid;
mutex_lock(&uctx->lock);
list_add_tail(&entry->entry, &uctx->qpids);
mutex_unlock(&uctx->lock);
}
void cxio_release_ucontext(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
{
struct list_head *pos, *nxt;
struct cxio_qpid_list *entry;
mutex_lock(&uctx->lock);
list_for_each_safe(pos, nxt, &uctx->qpids) {
entry = list_entry(pos, struct cxio_qpid_list, entry);
list_del_init(&entry->entry);
if (!(entry->qpid & rdev_p->qpmask))
cxio_hal_put_qpid(rdev_p->rscp, entry->qpid);
kfree(entry);
}
mutex_unlock(&uctx->lock);
}
void cxio_init_ucontext(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
{
INIT_LIST_HEAD(&uctx->qpids);
mutex_init(&uctx->lock);
}
int cxio_create_qp(struct cxio_rdev *rdev_p, u32 kernel_domain,
struct t3_wq *wq, struct cxio_ucontext *uctx)
{
int depth = 1UL << wq->size_log2;
int rqsize = 1UL << wq->rq_size_log2;
wq->qpid = get_qpid(rdev_p, uctx);
if (!wq->qpid)
return -ENOMEM;
wq->rq = kzalloc(depth * sizeof(u64), GFP_KERNEL);
if (!wq->rq)
goto err1;
wq->rq_addr = cxio_hal_rqtpool_alloc(rdev_p, rqsize);
if (!wq->rq_addr)
goto err2;
wq->sq = kzalloc(depth * sizeof(struct t3_swsq), GFP_KERNEL);
if (!wq->sq)
goto err3;
wq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev),
depth * sizeof(union t3_wr),
&(wq->dma_addr), GFP_KERNEL);
if (!wq->queue)
goto err4;
memset(wq->queue, 0, depth * sizeof(union t3_wr));
pci_unmap_addr_set(wq, mapping, wq->dma_addr);
wq->doorbell = (void __iomem *)rdev_p->rnic_info.kdb_addr;
if (!kernel_domain)
wq->udb = (u64)rdev_p->rnic_info.udbell_physbase +
(wq->qpid << rdev_p->qpshift);
PDBG("%s qpid 0x%x doorbell 0x%p udb 0x%llx\n", __FUNCTION__,
wq->qpid, wq->doorbell, (unsigned long long) wq->udb);
return 0;
err4:
kfree(wq->sq);
err3:
cxio_hal_rqtpool_free(rdev_p, wq->rq_addr, rqsize);
err2:
kfree(wq->rq);
err1:
put_qpid(rdev_p, wq->qpid, uctx);
return -ENOMEM;
}
int cxio_destroy_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
{
int err;
err = cxio_hal_clear_cq_ctx(rdev_p, cq->cqid);
kfree(cq->sw_queue);
dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
(1UL << (cq->size_log2))
* sizeof(struct t3_cqe), cq->queue,
pci_unmap_addr(cq, mapping));
cxio_hal_put_cqid(rdev_p->rscp, cq->cqid);
return err;
}
int cxio_destroy_qp(struct cxio_rdev *rdev_p, struct t3_wq *wq,
struct cxio_ucontext *uctx)
{
dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
(1UL << (wq->size_log2))
* sizeof(union t3_wr), wq->queue,
pci_unmap_addr(wq, mapping));
kfree(wq->sq);
cxio_hal_rqtpool_free(rdev_p, wq->rq_addr, (1UL << wq->rq_size_log2));
kfree(wq->rq);
put_qpid(rdev_p, wq->qpid, uctx);
return 0;
}
static void insert_recv_cqe(struct t3_wq *wq, struct t3_cq *cq)
{
struct t3_cqe cqe;
PDBG("%s wq %p cq %p sw_rptr 0x%x sw_wptr 0x%x\n", __FUNCTION__,
wq, cq, cq->sw_rptr, cq->sw_wptr);
memset(&cqe, 0, sizeof(cqe));
cqe.header = cpu_to_be32(V_CQE_STATUS(TPT_ERR_SWFLUSH) |
V_CQE_OPCODE(T3_SEND) |
V_CQE_TYPE(0) |
V_CQE_SWCQE(1) |
V_CQE_QPID(wq->qpid) |
V_CQE_GENBIT(Q_GENBIT(cq->sw_wptr,
cq->size_log2)));
*(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2)) = cqe;
cq->sw_wptr++;
}
void cxio_flush_rq(struct t3_wq *wq, struct t3_cq *cq, int count)
{
u32 ptr;
PDBG("%s wq %p cq %p\n", __FUNCTION__, wq, cq);
/* flush RQ */
PDBG("%s rq_rptr %u rq_wptr %u skip count %u\n", __FUNCTION__,
wq->rq_rptr, wq->rq_wptr, count);
ptr = wq->rq_rptr + count;
while (ptr++ != wq->rq_wptr)
insert_recv_cqe(wq, cq);
}
static void insert_sq_cqe(struct t3_wq *wq, struct t3_cq *cq,
struct t3_swsq *sqp)
{
struct t3_cqe cqe;
PDBG("%s wq %p cq %p sw_rptr 0x%x sw_wptr 0x%x\n", __FUNCTION__,
wq, cq, cq->sw_rptr, cq->sw_wptr);
memset(&cqe, 0, sizeof(cqe));
cqe.header = cpu_to_be32(V_CQE_STATUS(TPT_ERR_SWFLUSH) |
V_CQE_OPCODE(sqp->opcode) |
V_CQE_TYPE(1) |
V_CQE_SWCQE(1) |
V_CQE_QPID(wq->qpid) |
V_CQE_GENBIT(Q_GENBIT(cq->sw_wptr,
cq->size_log2)));
cqe.u.scqe.wrid_hi = sqp->sq_wptr;
*(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2)) = cqe;
cq->sw_wptr++;
}
void cxio_flush_sq(struct t3_wq *wq, struct t3_cq *cq, int count)
{
__u32 ptr;
struct t3_swsq *sqp = wq->sq + Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2);
ptr = wq->sq_rptr + count;
sqp += count;
while (ptr != wq->sq_wptr) {
insert_sq_cqe(wq, cq, sqp);
sqp++;
ptr++;
}
}
/*
* Move all CQEs from the HWCQ into the SWCQ.
*/
void cxio_flush_hw_cq(struct t3_cq *cq)
{
struct t3_cqe *cqe, *swcqe;
PDBG("%s cq %p cqid 0x%x\n", __FUNCTION__, cq, cq->cqid);
cqe = cxio_next_hw_cqe(cq);
while (cqe) {
PDBG("%s flushing hwcq rptr 0x%x to swcq wptr 0x%x\n",
__FUNCTION__, cq->rptr, cq->sw_wptr);
swcqe = cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2);
*swcqe = *cqe;
swcqe->header |= cpu_to_be32(V_CQE_SWCQE(1));
cq->sw_wptr++;
cq->rptr++;
cqe = cxio_next_hw_cqe(cq);
}
}
static int cqe_completes_wr(struct t3_cqe *cqe, struct t3_wq *wq)
{
if (CQE_OPCODE(*cqe) == T3_TERMINATE)
return 0;
if ((CQE_OPCODE(*cqe) == T3_RDMA_WRITE) && RQ_TYPE(*cqe))
return 0;
if ((CQE_OPCODE(*cqe) == T3_READ_RESP) && SQ_TYPE(*cqe))
return 0;
if ((CQE_OPCODE(*cqe) == T3_SEND) && RQ_TYPE(*cqe) &&
Q_EMPTY(wq->rq_rptr, wq->rq_wptr))
return 0;
return 1;
}
void cxio_count_scqes(struct t3_cq *cq, struct t3_wq *wq, int *count)
{
struct t3_cqe *cqe;
u32 ptr;
*count = 0;
ptr = cq->sw_rptr;
while (!Q_EMPTY(ptr, cq->sw_wptr)) {
cqe = cq->sw_queue + (Q_PTR2IDX(ptr, cq->size_log2));
if ((SQ_TYPE(*cqe) || (CQE_OPCODE(*cqe) == T3_READ_RESP)) &&
(CQE_QPID(*cqe) == wq->qpid))
(*count)++;
ptr++;
}
PDBG("%s cq %p count %d\n", __FUNCTION__, cq, *count);
}
void cxio_count_rcqes(struct t3_cq *cq, struct t3_wq *wq, int *count)
{
struct t3_cqe *cqe;
u32 ptr;
*count = 0;
PDBG("%s count zero %d\n", __FUNCTION__, *count);
ptr = cq->sw_rptr;
while (!Q_EMPTY(ptr, cq->sw_wptr)) {
cqe = cq->sw_queue + (Q_PTR2IDX(ptr, cq->size_log2));
if (RQ_TYPE(*cqe) && (CQE_OPCODE(*cqe) != T3_READ_RESP) &&
(CQE_QPID(*cqe) == wq->qpid) && cqe_completes_wr(cqe, wq))
(*count)++;
ptr++;
}
PDBG("%s cq %p count %d\n", __FUNCTION__, cq, *count);
}
static int cxio_hal_init_ctrl_cq(struct cxio_rdev *rdev_p)
{
struct rdma_cq_setup setup;
setup.id = 0;
setup.base_addr = 0; /* NULL address */
setup.size = 1; /* enable the CQ */
setup.credits = 0;
/* force SGE to redirect to RspQ and interrupt */
setup.credit_thres = 0;
setup.ovfl_mode = 1;
return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
}
static int cxio_hal_init_ctrl_qp(struct cxio_rdev *rdev_p)
{
int err;
u64 sge_cmd, ctx0, ctx1;
u64 base_addr;
struct t3_modify_qp_wr *wqe;
struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_KERNEL);
if (!skb) {
PDBG("%s alloc_skb failed\n", __FUNCTION__);
return -ENOMEM;
}
err = cxio_hal_init_ctrl_cq(rdev_p);
if (err) {
PDBG("%s err %d initializing ctrl_cq\n", __FUNCTION__, err);
return err;
}
rdev_p->ctrl_qp.workq = dma_alloc_coherent(
&(rdev_p->rnic_info.pdev->dev),
(1 << T3_CTRL_QP_SIZE_LOG2) *
sizeof(union t3_wr),
&(rdev_p->ctrl_qp.dma_addr),
GFP_KERNEL);
if (!rdev_p->ctrl_qp.workq) {
PDBG("%s dma_alloc_coherent failed\n", __FUNCTION__);
return -ENOMEM;
}
pci_unmap_addr_set(&rdev_p->ctrl_qp, mapping,
rdev_p->ctrl_qp.dma_addr);
rdev_p->ctrl_qp.doorbell = (void __iomem *)rdev_p->rnic_info.kdb_addr;
memset(rdev_p->ctrl_qp.workq, 0,
(1 << T3_CTRL_QP_SIZE_LOG2) * sizeof(union t3_wr));
mutex_init(&rdev_p->ctrl_qp.lock);
init_waitqueue_head(&rdev_p->ctrl_qp.waitq);
/* update HW Ctrl QP context */
base_addr = rdev_p->ctrl_qp.dma_addr;
base_addr >>= 12;
ctx0 = (V_EC_SIZE((1 << T3_CTRL_QP_SIZE_LOG2)) |
V_EC_BASE_LO((u32) base_addr & 0xffff));
ctx0 <<= 32;
ctx0 |= V_EC_CREDITS(FW_WR_NUM);
base_addr >>= 16;
ctx1 = (u32) base_addr;
base_addr >>= 32;
ctx1 |= ((u64) (V_EC_BASE_HI((u32) base_addr & 0xf) | V_EC_RESPQ(0) |
V_EC_TYPE(0) | V_EC_GEN(1) |
V_EC_UP_TOKEN(T3_CTL_QP_TID) | F_EC_VALID)) << 32;
wqe = (struct t3_modify_qp_wr *) skb_put(skb, sizeof(*wqe));
memset(wqe, 0, sizeof(*wqe));
build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_QP_MOD, 0, 1,
T3_CTL_QP_TID, 7);
wqe->flags = cpu_to_be32(MODQP_WRITE_EC);
sge_cmd = (3ULL << 56) | FW_RI_SGEEC_START << 8 | 3;
wqe->sge_cmd = cpu_to_be64(sge_cmd);
wqe->ctx1 = cpu_to_be64(ctx1);
wqe->ctx0 = cpu_to_be64(ctx0);
PDBG("CtrlQP dma_addr 0x%llx workq %p size %d\n",
(unsigned long long) rdev_p->ctrl_qp.dma_addr,
rdev_p->ctrl_qp.workq, 1 << T3_CTRL_QP_SIZE_LOG2);
skb->priority = CPL_PRIORITY_CONTROL;
return (cxgb3_ofld_send(rdev_p->t3cdev_p, skb));
}
static int cxio_hal_destroy_ctrl_qp(struct cxio_rdev *rdev_p)
{
dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
(1UL << T3_CTRL_QP_SIZE_LOG2)
* sizeof(union t3_wr), rdev_p->ctrl_qp.workq,
pci_unmap_addr(&rdev_p->ctrl_qp, mapping));
return cxio_hal_clear_qp_ctx(rdev_p, T3_CTRL_QP_ID);
}
/* write len bytes of data into addr (32B aligned address)
* If data is NULL, clear len byte of memory to zero.
* caller aquires the ctrl_qp lock before the call
*/
static int cxio_hal_ctrl_qp_write_mem(struct cxio_rdev *rdev_p, u32 addr,
u32 len, void *data, int completion)
{
u32 i, nr_wqe, copy_len;
u8 *copy_data;
u8 wr_len, utx_len; /* lenght in 8 byte flit */
enum t3_wr_flags flag;
__be64 *wqe;
u64 utx_cmd;
addr &= 0x7FFFFFF;
nr_wqe = len % 96 ? len / 96 + 1 : len / 96; /* 96B max per WQE */
PDBG("%s wptr 0x%x rptr 0x%x len %d, nr_wqe %d data %p addr 0x%0x\n",
__FUNCTION__, rdev_p->ctrl_qp.wptr, rdev_p->ctrl_qp.rptr, len,
nr_wqe, data, addr);
utx_len = 3; /* in 32B unit */
for (i = 0; i < nr_wqe; i++) {
if (Q_FULL(rdev_p->ctrl_qp.rptr, rdev_p->ctrl_qp.wptr,
T3_CTRL_QP_SIZE_LOG2)) {
PDBG("%s ctrl_qp full wtpr 0x%0x rptr 0x%0x, "
"wait for more space i %d\n", __FUNCTION__,
rdev_p->ctrl_qp.wptr, rdev_p->ctrl_qp.rptr, i);
if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
!Q_FULL(rdev_p->ctrl_qp.rptr,
rdev_p->ctrl_qp.wptr,
T3_CTRL_QP_SIZE_LOG2))) {
PDBG("%s ctrl_qp workq interrupted\n",
__FUNCTION__);
return -ERESTARTSYS;
}
PDBG("%s ctrl_qp wakeup, continue posting work request "
"i %d\n", __FUNCTION__, i);
}
wqe = (__be64 *)(rdev_p->ctrl_qp.workq + (rdev_p->ctrl_qp.wptr %
(1 << T3_CTRL_QP_SIZE_LOG2)));
flag = 0;
if (i == (nr_wqe - 1)) {
/* last WQE */
flag = completion ? T3_COMPLETION_FLAG : 0;
if (len % 32)
utx_len = len / 32 + 1;
else
utx_len = len / 32;
}
/*
* Force a CQE to return the credit to the workq in case
* we posted more than half the max QP size of WRs
*/
if ((i != 0) &&
(i % (((1 << T3_CTRL_QP_SIZE_LOG2)) >> 1) == 0)) {
flag = T3_COMPLETION_FLAG;
PDBG("%s force completion at i %d\n", __FUNCTION__, i);
}
/* build the utx mem command */
wqe += (sizeof(struct t3_bypass_wr) >> 3);
utx_cmd = (T3_UTX_MEM_WRITE << 28) | (addr + i * 3);
utx_cmd <<= 32;
utx_cmd |= (utx_len << 28) | ((utx_len << 2) + 1);
*wqe = cpu_to_be64(utx_cmd);
wqe++;
copy_data = (u8 *) data + i * 96;
copy_len = len > 96 ? 96 : len;
/* clear memory content if data is NULL */
if (data)
memcpy(wqe, copy_data, copy_len);
else
memset(wqe, 0, copy_len);
if (copy_len % 32)
memset(((u8 *) wqe) + copy_len, 0,
32 - (copy_len % 32));
wr_len = ((sizeof(struct t3_bypass_wr)) >> 3) + 1 +
(utx_len << 2);
wqe = (__be64 *)(rdev_p->ctrl_qp.workq + (rdev_p->ctrl_qp.wptr %
(1 << T3_CTRL_QP_SIZE_LOG2)));
/* wptr in the WRID[31:0] */
((union t3_wrid *)(wqe+1))->id0.low = rdev_p->ctrl_qp.wptr;
/*
* This must be the last write with a memory barrier
* for the genbit
*/
build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_BP, flag,
Q_GENBIT(rdev_p->ctrl_qp.wptr,
T3_CTRL_QP_SIZE_LOG2), T3_CTRL_QP_ID,
wr_len);
if (flag == T3_COMPLETION_FLAG)
ring_doorbell(rdev_p->ctrl_qp.doorbell, T3_CTRL_QP_ID);
len -= 96;
rdev_p->ctrl_qp.wptr++;
}
return 0;
}
/* IN: stag key, pdid, perm, zbva, to, len, page_size, pbl, and pbl_size
* OUT: stag index, actual pbl_size, pbl_addr allocated.
* TBD: shared memory region support
*/
static int __cxio_tpt_op(struct cxio_rdev *rdev_p, u32 reset_tpt_entry,
u32 *stag, u8 stag_state, u32 pdid,
enum tpt_mem_type type, enum tpt_mem_perm perm,
u32 zbva, u64 to, u32 len, u8 page_size, __be64 *pbl,
u32 *pbl_size, u32 *pbl_addr)
{
int err;
struct tpt_entry tpt;
u32 stag_idx;
u32 wptr;
int rereg = (*stag != T3_STAG_UNSET);
stag_state = stag_state > 0;
stag_idx = (*stag) >> 8;
if ((!reset_tpt_entry) && !(*stag != T3_STAG_UNSET)) {
stag_idx = cxio_hal_get_stag(rdev_p->rscp);
if (!stag_idx)
return -ENOMEM;
*stag = (stag_idx << 8) | ((*stag) & 0xFF);
}
PDBG("%s stag_state 0x%0x type 0x%0x pdid 0x%0x, stag_idx 0x%x\n",
__FUNCTION__, stag_state, type, pdid, stag_idx);
if (reset_tpt_entry)
cxio_hal_pblpool_free(rdev_p, *pbl_addr, *pbl_size << 3);
else if (!rereg) {
*pbl_addr = cxio_hal_pblpool_alloc(rdev_p, *pbl_size << 3);
if (!*pbl_addr) {
return -ENOMEM;
}
}
mutex_lock(&rdev_p->ctrl_qp.lock);
/* write PBL first if any - update pbl only if pbl list exist */
if (pbl) {
PDBG("%s *pdb_addr 0x%x, pbl_base 0x%x, pbl_size %d\n",
__FUNCTION__, *pbl_addr, rdev_p->rnic_info.pbl_base,
*pbl_size);
err = cxio_hal_ctrl_qp_write_mem(rdev_p,
(*pbl_addr >> 5),
(*pbl_size << 3), pbl, 0);
if (err)
goto ret;
}
/* write TPT entry */
if (reset_tpt_entry)
memset(&tpt, 0, sizeof(tpt));
else {
tpt.valid_stag_pdid = cpu_to_be32(F_TPT_VALID |
V_TPT_STAG_KEY((*stag) & M_TPT_STAG_KEY) |
V_TPT_STAG_STATE(stag_state) |
V_TPT_STAG_TYPE(type) | V_TPT_PDID(pdid));
BUG_ON(page_size >= 28);
tpt.flags_pagesize_qpid = cpu_to_be32(V_TPT_PERM(perm) |
F_TPT_MW_BIND_ENABLE |
V_TPT_ADDR_TYPE((zbva ? TPT_ZBTO : TPT_VATO)) |
V_TPT_PAGE_SIZE(page_size));
tpt.rsvd_pbl_addr = reset_tpt_entry ? 0 :
cpu_to_be32(V_TPT_PBL_ADDR(PBL_OFF(rdev_p, *pbl_addr)>>3));
tpt.len = cpu_to_be32(len);
tpt.va_hi = cpu_to_be32((u32) (to >> 32));
tpt.va_low_or_fbo = cpu_to_be32((u32) (to & 0xFFFFFFFFULL));
tpt.rsvd_bind_cnt_or_pstag = 0;
tpt.rsvd_pbl_size = reset_tpt_entry ? 0 :
cpu_to_be32(V_TPT_PBL_SIZE((*pbl_size) >> 2));
}
err = cxio_hal_ctrl_qp_write_mem(rdev_p,
stag_idx +
(rdev_p->rnic_info.tpt_base >> 5),
sizeof(tpt), &tpt, 1);
/* release the stag index to free pool */
if (reset_tpt_entry)
cxio_hal_put_stag(rdev_p->rscp, stag_idx);
ret:
wptr = rdev_p->ctrl_qp.wptr;
mutex_unlock(&rdev_p->ctrl_qp.lock);
if (!err)
if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
SEQ32_GE(rdev_p->ctrl_qp.rptr,
wptr)))
return -ERESTARTSYS;
return err;
}
int cxio_register_phys_mem(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid,
enum tpt_mem_perm perm, u32 zbva, u64 to, u32 len,
u8 page_size, __be64 *pbl, u32 *pbl_size,
u32 *pbl_addr)
{
*stag = T3_STAG_UNSET;
return __cxio_tpt_op(rdev_p, 0, stag, 1, pdid, TPT_NON_SHARED_MR, perm,
zbva, to, len, page_size, pbl, pbl_size, pbl_addr);
}
int cxio_reregister_phys_mem(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid,
enum tpt_mem_perm perm, u32 zbva, u64 to, u32 len,
u8 page_size, __be64 *pbl, u32 *pbl_size,
u32 *pbl_addr)
{
return __cxio_tpt_op(rdev_p, 0, stag, 1, pdid, TPT_NON_SHARED_MR, perm,
zbva, to, len, page_size, pbl, pbl_size, pbl_addr);
}
int cxio_dereg_mem(struct cxio_rdev *rdev_p, u32 stag, u32 pbl_size,
u32 pbl_addr)
{
return __cxio_tpt_op(rdev_p, 1, &stag, 0, 0, 0, 0, 0, 0ULL, 0, 0, NULL,
&pbl_size, &pbl_addr);
}
int cxio_allocate_window(struct cxio_rdev *rdev_p, u32 * stag, u32 pdid)
{
u32 pbl_size = 0;
*stag = T3_STAG_UNSET;
return __cxio_tpt_op(rdev_p, 0, stag, 0, pdid, TPT_MW, 0, 0, 0ULL, 0, 0,
NULL, &pbl_size, NULL);
}
int cxio_deallocate_window(struct cxio_rdev *rdev_p, u32 stag)
{
return __cxio_tpt_op(rdev_p, 1, &stag, 0, 0, 0, 0, 0, 0ULL, 0, 0, NULL,
NULL, NULL);
}
int cxio_rdma_init(struct cxio_rdev *rdev_p, struct t3_rdma_init_attr *attr)
{
struct t3_rdma_init_wr *wqe;
struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_ATOMIC);
if (!skb)
return -ENOMEM;
PDBG("%s rdev_p %p\n", __FUNCTION__, rdev_p);
wqe = (struct t3_rdma_init_wr *) __skb_put(skb, sizeof(*wqe));
wqe->wrh.op_seop_flags = cpu_to_be32(V_FW_RIWR_OP(T3_WR_INIT));
wqe->wrh.gen_tid_len = cpu_to_be32(V_FW_RIWR_TID(attr->tid) |
V_FW_RIWR_LEN(sizeof(*wqe) >> 3));
wqe->wrid.id1 = 0;
wqe->qpid = cpu_to_be32(attr->qpid);
wqe->pdid = cpu_to_be32(attr->pdid);
wqe->scqid = cpu_to_be32(attr->scqid);
wqe->rcqid = cpu_to_be32(attr->rcqid);
wqe->rq_addr = cpu_to_be32(attr->rq_addr - rdev_p->rnic_info.rqt_base);
wqe->rq_size = cpu_to_be32(attr->rq_size);
wqe->mpaattrs = attr->mpaattrs;
wqe->qpcaps = attr->qpcaps;
wqe->ulpdu_size = cpu_to_be16(attr->tcp_emss);
wqe->flags = cpu_to_be32(attr->flags);
wqe->ord = cpu_to_be32(attr->ord);
wqe->ird = cpu_to_be32(attr->ird);
wqe->qp_dma_addr = cpu_to_be64(attr->qp_dma_addr);
wqe->qp_dma_size = cpu_to_be32(attr->qp_dma_size);
wqe->rsvd = 0;
skb->priority = 0; /* 0=>ToeQ; 1=>CtrlQ */
return (cxgb3_ofld_send(rdev_p->t3cdev_p, skb));
}
void cxio_register_ev_cb(cxio_hal_ev_callback_func_t ev_cb)
{
cxio_ev_cb = ev_cb;
}
void cxio_unregister_ev_cb(cxio_hal_ev_callback_func_t ev_cb)
{
cxio_ev_cb = NULL;
}
static int cxio_hal_ev_handler(struct t3cdev *t3cdev_p, struct sk_buff *skb)
{
static int cnt;
struct cxio_rdev *rdev_p = NULL;
struct respQ_msg_t *rsp_msg = (struct respQ_msg_t *) skb->data;
PDBG("%d: %s cq_id 0x%x cq_ptr 0x%x genbit %0x overflow %0x an %0x"
" se %0x notify %0x cqbranch %0x creditth %0x\n",
cnt, __FUNCTION__, RSPQ_CQID(rsp_msg), RSPQ_CQPTR(rsp_msg),
RSPQ_GENBIT(rsp_msg), RSPQ_OVERFLOW(rsp_msg), RSPQ_AN(rsp_msg),
RSPQ_SE(rsp_msg), RSPQ_NOTIFY(rsp_msg), RSPQ_CQBRANCH(rsp_msg),
RSPQ_CREDIT_THRESH(rsp_msg));
PDBG("CQE: QPID 0x%0x genbit %0x type 0x%0x status 0x%0x opcode %d "
"len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
CQE_QPID(rsp_msg->cqe), CQE_GENBIT(rsp_msg->cqe),
CQE_TYPE(rsp_msg->cqe), CQE_STATUS(rsp_msg->cqe),
CQE_OPCODE(rsp_msg->cqe), CQE_LEN(rsp_msg->cqe),
CQE_WRID_HI(rsp_msg->cqe), CQE_WRID_LOW(rsp_msg->cqe));
rdev_p = (struct cxio_rdev *)t3cdev_p->ulp;
if (!rdev_p) {
PDBG("%s called by t3cdev %p with null ulp\n", __FUNCTION__,
t3cdev_p);
return 0;
}
if (CQE_QPID(rsp_msg->cqe) == T3_CTRL_QP_ID) {
rdev_p->ctrl_qp.rptr = CQE_WRID_LOW(rsp_msg->cqe) + 1;
wake_up_interruptible(&rdev_p->ctrl_qp.waitq);
dev_kfree_skb_irq(skb);
} else if (CQE_QPID(rsp_msg->cqe) == 0xfff8)
dev_kfree_skb_irq(skb);
else if (cxio_ev_cb)
(*cxio_ev_cb) (rdev_p, skb);
else
dev_kfree_skb_irq(skb);
cnt++;
return 0;
}
/* Caller takes care of locking if needed */
int cxio_rdev_open(struct cxio_rdev *rdev_p)
{
struct net_device *netdev_p = NULL;
int err = 0;
if (strlen(rdev_p->dev_name)) {
if (cxio_hal_find_rdev_by_name(rdev_p->dev_name)) {
return -EBUSY;
}
netdev_p = dev_get_by_name(rdev_p->dev_name);
if (!netdev_p) {
return -EINVAL;
}
dev_put(netdev_p);
} else if (rdev_p->t3cdev_p) {
if (cxio_hal_find_rdev_by_t3cdev(rdev_p->t3cdev_p)) {
return -EBUSY;
}
netdev_p = rdev_p->t3cdev_p->lldev;
strncpy(rdev_p->dev_name, rdev_p->t3cdev_p->name,
T3_MAX_DEV_NAME_LEN);
} else {
PDBG("%s t3cdev_p or dev_name must be set\n", __FUNCTION__);
return -EINVAL;
}
list_add_tail(&rdev_p->entry, &rdev_list);
PDBG("%s opening rnic dev %s\n", __FUNCTION__, rdev_p->dev_name);
memset(&rdev_p->ctrl_qp, 0, sizeof(rdev_p->ctrl_qp));
if (!rdev_p->t3cdev_p)
rdev_p->t3cdev_p = T3CDEV(netdev_p);
rdev_p->t3cdev_p->ulp = (void *) rdev_p;
err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_GET_PARAMS,
&(rdev_p->rnic_info));
if (err) {
printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
__FUNCTION__, rdev_p->t3cdev_p, err);
goto err1;
}
err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, GET_PORTS,
&(rdev_p->port_info));
if (err) {
printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
__FUNCTION__, rdev_p->t3cdev_p, err);
goto err1;
}
/*
* qpshift is the number of bits to shift the qpid left in order
* to get the correct address of the doorbell for that qp.
*/
cxio_init_ucontext(rdev_p, &rdev_p->uctx);
rdev_p->qpshift = PAGE_SHIFT -
ilog2(65536 >>
ilog2(rdev_p->rnic_info.udbell_len >>
PAGE_SHIFT));
rdev_p->qpnr = rdev_p->rnic_info.udbell_len >> PAGE_SHIFT;
rdev_p->qpmask = (65536 >> ilog2(rdev_p->qpnr)) - 1;
PDBG("%s rnic %s info: tpt_base 0x%0x tpt_top 0x%0x num stags %d "
"pbl_base 0x%0x pbl_top 0x%0x rqt_base 0x%0x, rqt_top 0x%0x\n",
__FUNCTION__, rdev_p->dev_name, rdev_p->rnic_info.tpt_base,
rdev_p->rnic_info.tpt_top, cxio_num_stags(rdev_p),
rdev_p->rnic_info.pbl_base,
rdev_p->rnic_info.pbl_top, rdev_p->rnic_info.rqt_base,
rdev_p->rnic_info.rqt_top);
PDBG("udbell_len 0x%0x udbell_physbase 0x%lx kdb_addr %p qpshift %lu "
"qpnr %d qpmask 0x%x\n",
rdev_p->rnic_info.udbell_len,
rdev_p->rnic_info.udbell_physbase, rdev_p->rnic_info.kdb_addr,
rdev_p->qpshift, rdev_p->qpnr, rdev_p->qpmask);
err = cxio_hal_init_ctrl_qp(rdev_p);
if (err) {
printk(KERN_ERR "%s error %d initializing ctrl_qp.\n",
__FUNCTION__, err);
goto err1;
}
err = cxio_hal_init_resource(rdev_p, cxio_num_stags(rdev_p), 0,
0, T3_MAX_NUM_QP, T3_MAX_NUM_CQ,
T3_MAX_NUM_PD);
if (err) {
printk(KERN_ERR "%s error %d initializing hal resources.\n",
__FUNCTION__, err);
goto err2;
}
err = cxio_hal_pblpool_create(rdev_p);
if (err) {
printk(KERN_ERR "%s error %d initializing pbl mem pool.\n",
__FUNCTION__, err);
goto err3;
}
err = cxio_hal_rqtpool_create(rdev_p);
if (err) {
printk(KERN_ERR "%s error %d initializing rqt mem pool.\n",
__FUNCTION__, err);
goto err4;
}
return 0;
err4:
cxio_hal_pblpool_destroy(rdev_p);
err3:
cxio_hal_destroy_resource(rdev_p->rscp);
err2:
cxio_hal_destroy_ctrl_qp(rdev_p);
err1:
list_del(&rdev_p->entry);
return err;
}
void cxio_rdev_close(struct cxio_rdev *rdev_p)
{
if (rdev_p) {
cxio_hal_pblpool_destroy(rdev_p);
cxio_hal_rqtpool_destroy(rdev_p);
list_del(&rdev_p->entry);
rdev_p->t3cdev_p->ulp = NULL;
cxio_hal_destroy_ctrl_qp(rdev_p);
cxio_hal_destroy_resource(rdev_p->rscp);
}
}
int __init cxio_hal_init(void)
{
if (cxio_hal_init_rhdl_resource(T3_MAX_NUM_RI))
return -ENOMEM;
t3_register_cpl_handler(CPL_ASYNC_NOTIF, cxio_hal_ev_handler);
return 0;
}
void __exit cxio_hal_exit(void)
{
struct cxio_rdev *rdev, *tmp;
t3_register_cpl_handler(CPL_ASYNC_NOTIF, NULL);
list_for_each_entry_safe(rdev, tmp, &rdev_list, entry)
cxio_rdev_close(rdev);
cxio_hal_destroy_rhdl_resource();
}
static void flush_completed_wrs(struct t3_wq *wq, struct t3_cq *cq)
{
struct t3_swsq *sqp;
__u32 ptr = wq->sq_rptr;
int count = Q_COUNT(wq->sq_rptr, wq->sq_wptr);
sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
while (count--)
if (!sqp->signaled) {
ptr++;
sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
} else if (sqp->complete) {
/*
* Insert this completed cqe into the swcq.
*/
PDBG("%s moving cqe into swcq sq idx %ld cq idx %ld\n",
__FUNCTION__, Q_PTR2IDX(ptr, wq->sq_size_log2),
Q_PTR2IDX(cq->sw_wptr, cq->size_log2));
sqp->cqe.header |= htonl(V_CQE_SWCQE(1));
*(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2))
= sqp->cqe;
cq->sw_wptr++;
sqp->signaled = 0;
break;
} else
break;
}
static void create_read_req_cqe(struct t3_wq *wq, struct t3_cqe *hw_cqe,
struct t3_cqe *read_cqe)
{
read_cqe->u.scqe.wrid_hi = wq->oldest_read->sq_wptr;
read_cqe->len = wq->oldest_read->read_len;
read_cqe->header = htonl(V_CQE_QPID(CQE_QPID(*hw_cqe)) |
V_CQE_SWCQE(SW_CQE(*hw_cqe)) |
V_CQE_OPCODE(T3_READ_REQ) |
V_CQE_TYPE(1));
}
/*
* Return a ptr to the next read wr in the SWSQ or NULL.
*/
static void advance_oldest_read(struct t3_wq *wq)
{
u32 rptr = wq->oldest_read - wq->sq + 1;
u32 wptr = Q_PTR2IDX(wq->sq_wptr, wq->sq_size_log2);
while (Q_PTR2IDX(rptr, wq->sq_size_log2) != wptr) {
wq->oldest_read = wq->sq + Q_PTR2IDX(rptr, wq->sq_size_log2);
if (wq->oldest_read->opcode == T3_READ_REQ)
return;
rptr++;
}
wq->oldest_read = NULL;
}
/*
* cxio_poll_cq
*
* Caller must:
* check the validity of the first CQE,
* supply the wq assicated with the qpid.
*
* credit: cq credit to return to sge.
* cqe_flushed: 1 iff the CQE is flushed.
* cqe: copy of the polled CQE.
*
* return value:
* 0 CQE returned,
* -1 CQE skipped, try again.
*/
int cxio_poll_cq(struct t3_wq *wq, struct t3_cq *cq, struct t3_cqe *cqe,
u8 *cqe_flushed, u64 *cookie, u32 *credit)
{
int ret = 0;
struct t3_cqe *hw_cqe, read_cqe;
*cqe_flushed = 0;
*credit = 0;
hw_cqe = cxio_next_cqe(cq);
PDBG("%s CQE OOO %d qpid 0x%0x genbit %d type %d status 0x%0x"
" opcode 0x%0x len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
__FUNCTION__, CQE_OOO(*hw_cqe), CQE_QPID(*hw_cqe),
CQE_GENBIT(*hw_cqe), CQE_TYPE(*hw_cqe), CQE_STATUS(*hw_cqe),
CQE_OPCODE(*hw_cqe), CQE_LEN(*hw_cqe), CQE_WRID_HI(*hw_cqe),
CQE_WRID_LOW(*hw_cqe));
/*
* skip cqe's not affiliated with a QP.
*/
if (wq == NULL) {
ret = -1;
goto skip_cqe;
}
/*
* Gotta tweak READ completions:
* 1) the cqe doesn't contain the sq_wptr from the wr.
* 2) opcode not reflected from the wr.
* 3) read_len not reflected from the wr.
* 4) cq_type is RQ_TYPE not SQ_TYPE.
*/
if (RQ_TYPE(*hw_cqe) && (CQE_OPCODE(*hw_cqe) == T3_READ_RESP)) {
/*
* Don't write to the HWCQ, so create a new read req CQE
* in local memory.
*/
create_read_req_cqe(wq, hw_cqe, &read_cqe);
hw_cqe = &read_cqe;
advance_oldest_read(wq);
}
/*
* T3A: Discard TERMINATE CQEs.
*/
if (CQE_OPCODE(*hw_cqe) == T3_TERMINATE) {
ret = -1;
wq->error = 1;
goto skip_cqe;
}
if (CQE_STATUS(*hw_cqe) || wq->error) {
*cqe_flushed = wq->error;
wq->error = 1;
/*
* T3A inserts errors into the CQE. We cannot return
* these as work completions.
*/
/* incoming write failures */
if ((CQE_OPCODE(*hw_cqe) == T3_RDMA_WRITE)
&& RQ_TYPE(*hw_cqe)) {
ret = -1;
goto skip_cqe;
}
/* incoming read request failures */
if ((CQE_OPCODE(*hw_cqe) == T3_READ_RESP) && SQ_TYPE(*hw_cqe)) {
ret = -1;
goto skip_cqe;
}
/* incoming SEND with no receive posted failures */
if ((CQE_OPCODE(*hw_cqe) == T3_SEND) && RQ_TYPE(*hw_cqe) &&
Q_EMPTY(wq->rq_rptr, wq->rq_wptr)) {
ret = -1;
goto skip_cqe;
}
goto proc_cqe;
}
/*
* RECV completion.
*/
if (RQ_TYPE(*hw_cqe)) {
/*
* HW only validates 4 bits of MSN. So we must validate that
* the MSN in the SEND is the next expected MSN. If its not,
* then we complete this with TPT_ERR_MSN and mark the wq in
* error.
*/
if (unlikely((CQE_WRID_MSN(*hw_cqe) != (wq->rq_rptr + 1)))) {
wq->error = 1;
hw_cqe->header |= htonl(V_CQE_STATUS(TPT_ERR_MSN));
goto proc_cqe;
}
goto proc_cqe;
}
/*
* If we get here its a send completion.
*
* Handle out of order completion. These get stuffed
* in the SW SQ. Then the SW SQ is walked to move any
* now in-order completions into the SW CQ. This handles
* 2 cases:
* 1) reaping unsignaled WRs when the first subsequent
* signaled WR is completed.
* 2) out of order read completions.
*/
if (!SW_CQE(*hw_cqe) && (CQE_WRID_SQ_WPTR(*hw_cqe) != wq->sq_rptr)) {
struct t3_swsq *sqp;
PDBG("%s out of order completion going in swsq at idx %ld\n",
__FUNCTION__,
Q_PTR2IDX(CQE_WRID_SQ_WPTR(*hw_cqe), wq->sq_size_log2));
sqp = wq->sq +
Q_PTR2IDX(CQE_WRID_SQ_WPTR(*hw_cqe), wq->sq_size_log2);
sqp->cqe = *hw_cqe;
sqp->complete = 1;
ret = -1;
goto flush_wq;
}
proc_cqe:
*cqe = *hw_cqe;
/*
* Reap the associated WR(s) that are freed up with this
* completion.
*/
if (SQ_TYPE(*hw_cqe)) {
wq->sq_rptr = CQE_WRID_SQ_WPTR(*hw_cqe);
PDBG("%s completing sq idx %ld\n", __FUNCTION__,
Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2));
*cookie = (wq->sq +
Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2))->wr_id;
wq->sq_rptr++;
} else {
PDBG("%s completing rq idx %ld\n", __FUNCTION__,
Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2));
*cookie = *(wq->rq + Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2));
wq->rq_rptr++;
}
flush_wq:
/*
* Flush any completed cqes that are now in-order.
*/
flush_completed_wrs(wq, cq);
skip_cqe:
if (SW_CQE(*hw_cqe)) {
PDBG("%s cq %p cqid 0x%x skip sw cqe sw_rptr 0x%x\n",
__FUNCTION__, cq, cq->cqid, cq->sw_rptr);
++cq->sw_rptr;
} else {
PDBG("%s cq %p cqid 0x%x skip hw cqe rptr 0x%x\n",
__FUNCTION__, cq, cq->cqid, cq->rptr);
++cq->rptr;
/*
* T3A: compute credits.
*/
if (((cq->rptr - cq->wptr) > (1 << (cq->size_log2 - 1)))
|| ((cq->rptr - cq->wptr) >= 128)) {
*credit = cq->rptr - cq->wptr;
cq->wptr = cq->rptr;
}
}
return ret;
}