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Commit 1dc7b1f1 authored by Christoph Hellwig's avatar Christoph Hellwig
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IB/srp: use the new CQ API 

This also moves recv completion handling from hardirq context into
softirq context.
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 59fae4de
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Inline Side-by-side
Showing with 86 additions and 94 deletions
drivers/infiniband/ulp/srp/ib_srp.c
View file @ 1dc7b1f1
......@@ -132,8 +132,9 @@ MODULE_PARM_DESC(ch_count,
static void srp_add_one(struct ib_device *device);
static void srp_remove_one(struct ib_device *device, void *client_data);
static void srp_recv_completion(struct ib_cq *cq, void *ch_ptr);
static void srp_send_completion(struct ib_cq *cq, void *ch_ptr);
static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc);
static void srp_handle_qp_err(struct ib_cq *cq, struct ib_wc *wc,
const char *opname);
static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
static struct scsi_transport_template *ib_srp_transport_template;
......@@ -445,6 +446,17 @@ static struct srp_fr_pool *srp_alloc_fr_pool(struct srp_target_port *target)
dev->max_pages_per_mr);
}
static void srp_drain_done(struct ib_cq *cq, struct ib_wc *wc)
{
struct srp_rdma_ch *ch = cq->cq_context;
complete(&ch->done);
}
static struct ib_cqe srp_drain_cqe = {
.done = srp_drain_done,
};
/**
* srp_destroy_qp() - destroy an RDMA queue pair
* @ch: SRP RDMA channel.
......@@ -461,7 +473,7 @@ static void srp_destroy_qp(struct srp_rdma_ch *ch)
struct ib_recv_wr *bad_wr;
int ret;
wr.wr_id = SRP_LAST_WR_ID;
wr.wr_cqe = &srp_drain_cqe;
/* Destroying a QP and reusing ch->done is only safe if not connected */
WARN_ON_ONCE(ch->connected);
......@@ -490,34 +502,27 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch)
struct ib_fmr_pool *fmr_pool = NULL;
struct srp_fr_pool *fr_pool = NULL;
const int m = 1 + dev->use_fast_reg;
struct ib_cq_init_attr cq_attr = {};
int ret;
init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
if (!init_attr)
return -ENOMEM;
/* + 1 for SRP_LAST_WR_ID */
cq_attr.cqe = target->queue_size + 1;
cq_attr.comp_vector = ch->comp_vector;
recv_cq = ib_create_cq(dev->dev, srp_recv_completion, NULL, ch,
&cq_attr);
/* queue_size + 1 for ib_drain_qp */
recv_cq = ib_alloc_cq(dev->dev, ch, target->queue_size + 1,
ch->comp_vector, IB_POLL_SOFTIRQ);
if (IS_ERR(recv_cq)) {
ret = PTR_ERR(recv_cq);
goto err;
}
cq_attr.cqe = m * target->queue_size;
cq_attr.comp_vector = ch->comp_vector;
send_cq = ib_create_cq(dev->dev, srp_send_completion, NULL, ch,
&cq_attr);
send_cq = ib_alloc_cq(dev->dev, ch, m * target->queue_size,
ch->comp_vector, IB_POLL_DIRECT);
if (IS_ERR(send_cq)) {
ret = PTR_ERR(send_cq);
goto err_recv_cq;
}
ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
init_attr->event_handler = srp_qp_event;
init_attr->cap.max_send_wr = m * target->queue_size;
init_attr->cap.max_recv_wr = target->queue_size + 1;
......@@ -559,9 +564,9 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch)
if (ch->qp)
srp_destroy_qp(ch);
if (ch->recv_cq)
ib_destroy_cq(ch->recv_cq);
ib_free_cq(ch->recv_cq);
if (ch->send_cq)
ib_destroy_cq(ch->send_cq);
ib_free_cq(ch->send_cq);
ch->qp = qp;
ch->recv_cq = recv_cq;
......@@ -581,13 +586,13 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch)
return 0;
err_qp:
ib_destroy_qp(qp);
srp_destroy_qp(ch);
err_send_cq:
ib_destroy_cq(send_cq);
ib_free_cq(send_cq);
err_recv_cq:
ib_destroy_cq(recv_cq);
ib_free_cq(recv_cq);
err:
kfree(init_attr);
......@@ -623,9 +628,10 @@ static void srp_free_ch_ib(struct srp_target_port *target,
if (ch->fmr_pool)
ib_destroy_fmr_pool(ch->fmr_pool);
}
srp_destroy_qp(ch);
ib_destroy_cq(ch->send_cq);
ib_destroy_cq(ch->recv_cq);
ib_free_cq(ch->send_cq);
ib_free_cq(ch->recv_cq);
/*
* Avoid that the SCSI error handler tries to use this channel after
......@@ -1038,7 +1044,13 @@ static int srp_connect_ch(struct srp_rdma_ch *ch, bool multich)
}
}
static int srp_inv_rkey(struct srp_rdma_ch *ch, u32 rkey)
static void srp_inv_rkey_err_done(struct ib_cq *cq, struct ib_wc *wc)
{
srp_handle_qp_err(cq, wc, "INV RKEY");
}
static int srp_inv_rkey(struct srp_request *req, struct srp_rdma_ch *ch,
u32 rkey)
{
struct ib_send_wr *bad_wr;
struct ib_send_wr wr = {
......@@ -1049,8 +1061,8 @@ static int srp_inv_rkey(struct srp_rdma_ch *ch, u32 rkey)
.ex.invalidate_rkey = rkey,
};
wr.wr_id = LOCAL_INV_WR_ID_MASK;
wr.wr_cqe = &req->reg_cqe;
req->reg_cqe.done = srp_inv_rkey_err_done;
return ib_post_send(ch->qp, &wr, &bad_wr);
}
......@@ -1072,7 +1084,7 @@ static void srp_unmap_data(struct scsi_cmnd *scmnd,
struct srp_fr_desc **pfr;
for (i = req->nmdesc, pfr = req->fr_list; i > 0; i--, pfr++) {
res = srp_inv_rkey(ch, (*pfr)->mr->rkey);
res = srp_inv_rkey(req, ch, (*pfr)->mr->rkey);
if (res < 0) {
shost_printk(KERN_ERR, target->scsi_host, PFX
"Queueing INV WR for rkey %#x failed (%d)\n",
......@@ -1310,7 +1322,13 @@ static int srp_map_finish_fmr(struct srp_map_state *state,
return 0;
}
static void srp_reg_mr_err_done(struct ib_cq *cq, struct ib_wc *wc)
{
srp_handle_qp_err(cq, wc, "FAST REG");
}
static int srp_map_finish_fr(struct srp_map_state *state,
struct srp_request *req,
struct srp_rdma_ch *ch)
{
struct srp_target_port *target = ch->target;
......@@ -1348,9 +1366,11 @@ static int srp_map_finish_fr(struct srp_map_state *state,
if (unlikely(n < 0))
return n;
req->reg_cqe.done = srp_reg_mr_err_done;
wr.wr.next = NULL;
wr.wr.opcode = IB_WR_REG_MR;
wr.wr.wr_id = FAST_REG_WR_ID_MASK;
wr.wr.wr_cqe = &req->reg_cqe;
wr.wr.num_sge = 0;
wr.wr.send_flags = 0;
wr.mr = desc->mr;
......@@ -1455,7 +1475,7 @@ static int srp_map_sg_fr(struct srp_map_state *state, struct srp_rdma_ch *ch,
while (state->sg_nents) {
int i, n;
n = srp_map_finish_fr(state, ch);
n = srp_map_finish_fr(state, req, ch);
if (unlikely(n < 0))
return n;
......@@ -1522,7 +1542,7 @@ static int srp_map_idb(struct srp_rdma_ch *ch, struct srp_request *req,
state.sg_nents = 1;
sg_set_buf(idb_sg, req->indirect_desc, idb_len);
idb_sg->dma_address = req->indirect_dma_addr; /* hack! */
ret = srp_map_finish_fr(&state, ch);
ret = srp_map_finish_fr(&state, req, ch);
if (ret < 0)
return ret;
} else if (dev->use_fmr) {
......@@ -1717,7 +1737,7 @@ static struct srp_iu *__srp_get_tx_iu(struct srp_rdma_ch *ch,
s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
struct srp_iu *iu;
srp_send_completion(ch->send_cq, ch);
ib_process_cq_direct(ch->send_cq, -1);
if (list_empty(&ch->free_tx))
return NULL;
......@@ -1737,6 +1757,19 @@ static struct srp_iu *__srp_get_tx_iu(struct srp_rdma_ch *ch,
return iu;
}
static void srp_send_done(struct ib_cq *cq, struct ib_wc *wc)
{
struct srp_iu *iu = container_of(wc->wr_cqe, struct srp_iu, cqe);
struct srp_rdma_ch *ch = cq->cq_context;
if (unlikely(wc->status != IB_WC_SUCCESS)) {
srp_handle_qp_err(cq, wc, "SEND");
return;
}
list_add(&iu->list, &ch->free_tx);
}
static int srp_post_send(struct srp_rdma_ch *ch, struct srp_iu *iu, int len)
{
struct srp_target_port *target = ch->target;
......@@ -1747,8 +1780,10 @@ static int srp_post_send(struct srp_rdma_ch *ch, struct srp_iu *iu, int len)
list.length = len;
list.lkey = target->lkey;
iu->cqe.done = srp_send_done;
wr.next = NULL;
wr.wr_id = (uintptr_t) iu;
wr.wr_cqe = &iu->cqe;
wr.sg_list = &list;
wr.num_sge = 1;
wr.opcode = IB_WR_SEND;
......@@ -1767,8 +1802,10 @@ static int srp_post_recv(struct srp_rdma_ch *ch, struct srp_iu *iu)
list.length = iu->size;
list.lkey = target->lkey;
iu->cqe.done = srp_recv_done;
wr.next = NULL;
wr.wr_id = (uintptr_t) iu;
wr.wr_cqe = &iu->cqe;
wr.sg_list = &list;
wr.num_sge = 1;
......@@ -1900,14 +1937,20 @@ static void srp_process_aer_req(struct srp_rdma_ch *ch,
"problems processing SRP_AER_REQ\n");
}
static void srp_handle_recv(struct srp_rdma_ch *ch, struct ib_wc *wc)
static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)
{
struct srp_iu *iu = container_of(wc->wr_cqe, struct srp_iu, cqe);
struct srp_rdma_ch *ch = cq->cq_context;
struct srp_target_port *target = ch->target;
struct ib_device *dev = target->srp_host->srp_dev->dev;
struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
int res;
u8 opcode;
if (unlikely(wc->status != IB_WC_SUCCESS)) {
srp_handle_qp_err(cq, wc, "RECV");
return;
}
ib_dma_sync_single_for_cpu(dev, iu->dma, ch->max_ti_iu_len,
DMA_FROM_DEVICE);
......@@ -1970,68 +2013,22 @@ static void srp_tl_err_work(struct work_struct *work)
srp_start_tl_fail_timers(target->rport);
}
static void srp_handle_qp_err(u64 wr_id, enum ib_wc_status wc_status,
bool send_err, struct srp_rdma_ch *ch)
static void srp_handle_qp_err(struct ib_cq *cq, struct ib_wc *wc,
const char *opname)
{
struct srp_rdma_ch *ch = cq->cq_context;
struct srp_target_port *target = ch->target;
if (wr_id == SRP_LAST_WR_ID) {
complete(&ch->done);
return;
}
if (ch->connected && !target->qp_in_error) {
if (wr_id & LOCAL_INV_WR_ID_MASK) {
shost_printk(KERN_ERR, target->scsi_host, PFX
"LOCAL_INV failed with status %s (%d)\n",
ib_wc_status_msg(wc_status), wc_status);
} else if (wr_id & FAST_REG_WR_ID_MASK) {
shost_printk(KERN_ERR, target->scsi_host, PFX
"FAST_REG_MR failed status %s (%d)\n",
ib_wc_status_msg(wc_status), wc_status);
} else {
shost_printk(KERN_ERR, target->scsi_host,
PFX "failed %s status %s (%d) for iu %p\n",
send_err ? "send" : "receive",
ib_wc_status_msg(wc_status), wc_status,
(void *)(uintptr_t)wr_id);
}
PFX "failed %s status %s (%d) for CQE %p\n",
opname, ib_wc_status_msg(wc->status), wc->status,
wc->wr_cqe);
queue_work(system_long_wq, &target->tl_err_work);
}
target->qp_in_error = true;
}
static void srp_recv_completion(struct ib_cq *cq, void *ch_ptr)
{
struct srp_rdma_ch *ch = ch_ptr;
struct ib_wc wc;
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
while (ib_poll_cq(cq, 1, &wc) > 0) {
if (likely(wc.status == IB_WC_SUCCESS)) {
srp_handle_recv(ch, &wc);
} else {
srp_handle_qp_err(wc.wr_id, wc.status, false, ch);
}
}
}
static void srp_send_completion(struct ib_cq *cq, void *ch_ptr)
{
struct srp_rdma_ch *ch = ch_ptr;
struct ib_wc wc;
struct srp_iu *iu;
while (ib_poll_cq(cq, 1, &wc) > 0) {
if (likely(wc.status == IB_WC_SUCCESS)) {
iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
list_add(&iu->list, &ch->free_tx);
} else {
srp_handle_qp_err(wc.wr_id, wc.status, true, ch);
}
}
}
static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
{
struct srp_target_port *target = host_to_target(shost);
......@@ -3585,8 +3582,6 @@ static int __init srp_init_module(void)
{
int ret;
BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
if (srp_sg_tablesize) {
pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
if (!cmd_sg_entries)
......
drivers/infiniband/ulp/srp/ib_srp.h
View file @ 1dc7b1f1
......@@ -66,11 +66,6 @@ enum {
SRP_TAG_TSK_MGMT = 1U << 31,
SRP_MAX_PAGES_PER_MR = 512,
LOCAL_INV_WR_ID_MASK = 1,
FAST_REG_WR_ID_MASK = 2,
SRP_LAST_WR_ID = 0xfffffffcU,
};
enum srp_target_state {
......@@ -128,6 +123,7 @@ struct srp_request {
struct srp_direct_buf *indirect_desc;
dma_addr_t indirect_dma_addr;
short nmdesc;
struct ib_cqe reg_cqe;
};
/**
......@@ -231,6 +227,7 @@ struct srp_iu {
void *buf;
size_t size;
enum dma_data_direction direction;
struct ib_cqe cqe;
};
/**
......
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