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RDS/IW: Convert to new memory registration API 

Get rid of fast_reg page list and its construction.
Instead, just pass the RDS sg list to ib_map_mr_sg
and post the new ib_reg_wr.

This is done both for server IW RDMA_READ registration
and the client remote key registration.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Sagi Grimberg 2015-10-13 19:11:37 +03:00 committed by Doug Ledford
parent 412a15c0fe
commit 9ddc87374a
3 changed files with 75 additions and 115 deletions
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5
net/rds/iw.h
View File

@ -74,13 +74,12 @@ struct rds_iw_send_work {
struct rm_rdma_op *s_op;
struct rds_iw_mapping *s_mapping;
struct ib_mr *s_mr;
struct ib_fast_reg_page_list *s_page_list;
unsigned char s_remap_count;
union {
struct ib_send_wr s_send_wr;
struct ib_rdma_wr s_rdma_wr;
struct ib_fast_reg_wr s_fast_reg_wr;
struct ib_reg_wr s_reg_wr;
};
struct ib_sge s_sge[RDS_IW_MAX_SGE];
unsigned long s_queued;
@ -199,7 +198,7 @@ struct rds_iw_device {
/* Magic WR_ID for ACKs */
#define RDS_IW_ACK_WR_ID ((u64)0xffffffffffffffffULL)
#define RDS_IW_FAST_REG_WR_ID ((u64)0xefefefefefefefefULL)
#define RDS_IW_REG_WR_ID ((u64)0xefefefefefefefefULL)
#define RDS_IW_LOCAL_INV_WR_ID ((u64)0xdfdfdfdfdfdfdfdfULL)
struct rds_iw_statistics {

128
net/rds/iw_rdma.c
View File

@ -47,7 +47,6 @@ struct rds_iw_mr {
struct rdma_cm_id *cm_id;
struct ib_mr *mr;
struct ib_fast_reg_page_list *page_list;
struct rds_iw_mapping mapping;
unsigned char remap_count;
@ -77,8 +76,8 @@ struct rds_iw_mr_pool {
static int rds_iw_flush_mr_pool(struct rds_iw_mr_pool *pool, int free_all);
static void rds_iw_mr_pool_flush_worker(struct work_struct *work);
static int rds_iw_init_fastreg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr);
static int rds_iw_map_fastreg(struct rds_iw_mr_pool *pool,
static int rds_iw_init_reg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr);
static int rds_iw_map_reg(struct rds_iw_mr_pool *pool,
struct rds_iw_mr *ibmr,
struct scatterlist *sg, unsigned int nents);
static void rds_iw_free_fastreg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr);
@ -258,19 +257,18 @@ static void rds_iw_set_scatterlist(struct rds_iw_scatterlist *sg,
sg->bytes = 0;
}
static u64 *rds_iw_map_scatterlist(struct rds_iw_device *rds_iwdev,
struct rds_iw_scatterlist *sg)
static int rds_iw_map_scatterlist(struct rds_iw_device *rds_iwdev,
struct rds_iw_scatterlist *sg)
{
struct ib_device *dev = rds_iwdev->dev;
u64 *dma_pages = NULL;
int i, j, ret;
int i, ret;
WARN_ON(sg->dma_len);
sg->dma_len = ib_dma_map_sg(dev, sg->list, sg->len, DMA_BIDIRECTIONAL);
if (unlikely(!sg->dma_len)) {
printk(KERN_WARNING "RDS/IW: dma_map_sg failed!\n");
return ERR_PTR(-EBUSY);
return -EBUSY;
}
sg->bytes = 0;
@ -303,31 +301,14 @@ static u64 *rds_iw_map_scatterlist(struct rds_iw_device *rds_iwdev,
if (sg->dma_npages > fastreg_message_size)
goto out_unmap;
dma_pages = kmalloc(sizeof(u64) * sg->dma_npages, GFP_ATOMIC);
if (!dma_pages) {
ret = -ENOMEM;
goto out_unmap;
}
for (i = j = 0; i < sg->dma_len; ++i) {
unsigned int dma_len = ib_sg_dma_len(dev, &sg->list[i]);
u64 dma_addr = ib_sg_dma_address(dev, &sg->list[i]);
u64 end_addr;
end_addr = dma_addr + dma_len;
dma_addr &= ~PAGE_MASK;
for (; dma_addr < end_addr; dma_addr += PAGE_SIZE)
dma_pages[j++] = dma_addr;
BUG_ON(j > sg->dma_npages);
}
return dma_pages;
return 0;
out_unmap:
ib_dma_unmap_sg(rds_iwdev->dev, sg->list, sg->len, DMA_BIDIRECTIONAL);
sg->dma_len = 0;
kfree(dma_pages);
return ERR_PTR(ret);
return ret;
}
@ -440,7 +421,7 @@ static struct rds_iw_mr *rds_iw_alloc_mr(struct rds_iw_device *rds_iwdev)
INIT_LIST_HEAD(&ibmr->mapping.m_list);
ibmr->mapping.m_mr = ibmr;
err = rds_iw_init_fastreg(pool, ibmr);
err = rds_iw_init_reg(pool, ibmr);
if (err)
goto out_no_cigar;
@ -622,7 +603,7 @@ void *rds_iw_get_mr(struct scatterlist *sg, unsigned long nents,
ibmr->cm_id = cm_id;
ibmr->device = rds_iwdev;
ret = rds_iw_map_fastreg(rds_iwdev->mr_pool, ibmr, sg, nents);
ret = rds_iw_map_reg(rds_iwdev->mr_pool, ibmr, sg, nents);
if (ret == 0)
*key_ret = ibmr->mr->rkey;
else
@ -638,7 +619,7 @@ out:
}
/*
* iWARP fastreg handling
* iWARP reg handling
*
* The life cycle of a fastreg registration is a bit different from
* FMRs.
@ -650,7 +631,7 @@ out:
* This creates a bit of a problem for us, as we do not have the destination
* IP in GET_MR, so the connection must be setup prior to the GET_MR call for
* RDMA to be correctly setup. If a fastreg request is present, rds_iw_xmit
* will try to queue a LOCAL_INV (if needed) and a FAST_REG_MR work request
* will try to queue a LOCAL_INV (if needed) and a REG_MR work request
* before queuing the SEND. When completions for these arrive, they are
* dispatched to the MR has a bit set showing that RDMa can be performed.
*
@ -659,11 +640,10 @@ out:
* The expectation there is that this invalidation step includes ALL
* PREVIOUSLY FREED MRs.
*/
static int rds_iw_init_fastreg(struct rds_iw_mr_pool *pool,
struct rds_iw_mr *ibmr)
static int rds_iw_init_reg(struct rds_iw_mr_pool *pool,
struct rds_iw_mr *ibmr)
{
struct rds_iw_device *rds_iwdev = pool->device;
struct ib_fast_reg_page_list *page_list = NULL;
struct ib_mr *mr;
int err;
@ -676,56 +656,44 @@ static int rds_iw_init_fastreg(struct rds_iw_mr_pool *pool,
return err;
}
/* FIXME - this is overkill, but mapping->m_sg.dma_len/mapping->m_sg.dma_npages
* is not filled in.
*/
page_list = ib_alloc_fast_reg_page_list(rds_iwdev->dev, pool->max_message_size);
if (IS_ERR(page_list)) {
err = PTR_ERR(page_list);
printk(KERN_WARNING "RDS/IW: ib_alloc_fast_reg_page_list failed (err=%d)\n", err);
ib_dereg_mr(mr);
return err;
}
ibmr->page_list = page_list;
ibmr->mr = mr;
return 0;
}
static int rds_iw_rdma_build_fastreg(struct rds_iw_mapping *mapping)
static int rds_iw_rdma_reg_mr(struct rds_iw_mapping *mapping)
{
struct rds_iw_mr *ibmr = mapping->m_mr;
struct ib_fast_reg_wr f_wr;
struct rds_iw_scatterlist *m_sg = &mapping->m_sg;
struct ib_reg_wr reg_wr;
struct ib_send_wr *failed_wr;
int ret;
int ret, n;
n = ib_map_mr_sg_zbva(ibmr->mr, m_sg->list, m_sg->len, PAGE_SIZE);
if (unlikely(n != m_sg->len))
return n < 0 ? n : -EINVAL;
reg_wr.wr.next = NULL;
reg_wr.wr.opcode = IB_WR_REG_MR;
reg_wr.wr.wr_id = RDS_IW_REG_WR_ID;
reg_wr.wr.num_sge = 0;
reg_wr.mr = ibmr->mr;
reg_wr.key = mapping->m_rkey;
reg_wr.access = IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE;
/*
* Perform a WR for the fast_reg_mr. Each individual page
* Perform a WR for the reg_mr. Each individual page
* in the sg list is added to the fast reg page list and placed
* inside the fast_reg_mr WR. The key used is a rolling 8bit
* inside the reg_mr WR. The key used is a rolling 8bit
* counter, which should guarantee uniqueness.
*/
ib_update_fast_reg_key(ibmr->mr, ibmr->remap_count++);
mapping->m_rkey = ibmr->mr->rkey;
memset(&f_wr, 0, sizeof(f_wr));
f_wr.wr.wr_id = RDS_IW_FAST_REG_WR_ID;
f_wr.wr.opcode = IB_WR_FAST_REG_MR;
f_wr.length = mapping->m_sg.bytes;
f_wr.rkey = mapping->m_rkey;
f_wr.page_list = ibmr->page_list;
f_wr.page_list_len = mapping->m_sg.dma_len;
f_wr.page_shift = PAGE_SHIFT;
f_wr.access_flags = IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE;
f_wr.iova_start = 0;
f_wr.wr.send_flags = IB_SEND_SIGNALED;
failed_wr = &f_wr.wr;
ret = ib_post_send(ibmr->cm_id->qp, &f_wr.wr, &failed_wr);
BUG_ON(failed_wr != &f_wr.wr);
failed_wr = &reg_wr.wr;
ret = ib_post_send(ibmr->cm_id->qp, &reg_wr.wr, &failed_wr);
BUG_ON(failed_wr != &reg_wr.wr);
if (ret)
printk_ratelimited(KERN_WARNING "RDS/IW: %s:%d ib_post_send returned %d\n",
__func__, __LINE__, ret);
@ -757,21 +725,20 @@ out:
return ret;
}
static int rds_iw_map_fastreg(struct rds_iw_mr_pool *pool,
struct rds_iw_mr *ibmr,
struct scatterlist *sg,
unsigned int sg_len)
static int rds_iw_map_reg(struct rds_iw_mr_pool *pool,
struct rds_iw_mr *ibmr,
struct scatterlist *sg,
unsigned int sg_len)
{
struct rds_iw_device *rds_iwdev = pool->device;
struct rds_iw_mapping *mapping = &ibmr->mapping;
u64 *dma_pages;
int i, ret = 0;
int ret = 0;
rds_iw_set_scatterlist(&mapping->m_sg, sg, sg_len);
dma_pages = rds_iw_map_scatterlist(rds_iwdev, &mapping->m_sg);
if (IS_ERR(dma_pages)) {
ret = PTR_ERR(dma_pages);
ret = rds_iw_map_scatterlist(rds_iwdev, &mapping->m_sg);
if (ret) {
dma_pages = NULL;
goto out;
}
@ -781,10 +748,7 @@ static int rds_iw_map_fastreg(struct rds_iw_mr_pool *pool,
goto out;
}
for (i = 0; i < mapping->m_sg.dma_npages; ++i)
ibmr->page_list->page_list[i] = dma_pages[i];
ret = rds_iw_rdma_build_fastreg(mapping);
ret = rds_iw_rdma_reg_mr(mapping);
if (ret)
goto out;
@ -870,8 +834,6 @@ static unsigned int rds_iw_unmap_fastreg_list(struct rds_iw_mr_pool *pool,
static void rds_iw_destroy_fastreg(struct rds_iw_mr_pool *pool,
struct rds_iw_mr *ibmr)
{
if (ibmr->page_list)
ib_free_fast_reg_page_list(ibmr->page_list);
if (ibmr->mr)
ib_dereg_mr(ibmr->mr);
}

57
net/rds/iw_send.c
View File

@ -159,13 +159,6 @@ void rds_iw_send_init_ring(struct rds_iw_connection *ic)
printk(KERN_WARNING "RDS/IW: ib_alloc_mr failed\n");
break;
}
send->s_page_list = ib_alloc_fast_reg_page_list(
ic->i_cm_id->device, fastreg_message_size);
if (IS_ERR(send->s_page_list)) {
printk(KERN_WARNING "RDS/IW: ib_alloc_fast_reg_page_list failed\n");
break;
}
}
}
@ -177,8 +170,6 @@ void rds_iw_send_clear_ring(struct rds_iw_connection *ic)
for (i = 0, send = ic->i_sends; i < ic->i_send_ring.w_nr; i++, send++) {
BUG_ON(!send->s_mr);
ib_dereg_mr(send->s_mr);
BUG_ON(!send->s_page_list);
ib_free_fast_reg_page_list(send->s_page_list);
if (send->s_send_wr.opcode == 0xdead)
continue;
if (send->s_rm)
@ -227,7 +218,7 @@ void rds_iw_send_cq_comp_handler(struct ib_cq *cq, void *context)
continue;
}
if (wc.opcode == IB_WC_FAST_REG_MR && wc.wr_id == RDS_IW_FAST_REG_WR_ID) {
if (wc.opcode == IB_WC_REG_MR && wc.wr_id == RDS_IW_REG_WR_ID) {
ic->i_fastreg_posted = 1;
continue;
}
@ -252,7 +243,7 @@ void rds_iw_send_cq_comp_handler(struct ib_cq *cq, void *context)
if (send->s_rm)
rds_iw_send_unmap_rm(ic, send, wc.status);
break;
case IB_WR_FAST_REG_MR:
case IB_WR_REG_MR:
case IB_WR_RDMA_WRITE:
case IB_WR_RDMA_READ:
case IB_WR_RDMA_READ_WITH_INV:
@ -770,24 +761,26 @@ out:
return ret;
}
static void rds_iw_build_send_fastreg(struct rds_iw_device *rds_iwdev, struct rds_iw_connection *ic, struct rds_iw_send_work *send, int nent, int len, u64 sg_addr)
static int rds_iw_build_send_reg(struct rds_iw_send_work *send,
struct scatterlist *sg,
int sg_nents)
{
BUG_ON(nent > send->s_page_list->max_page_list_len);
/*
* Perform a WR for the fast_reg_mr. Each individual page
* in the sg list is added to the fast reg page list and placed
* inside the fast_reg_mr WR.
*/
send->s_fast_reg_wr.wr.opcode = IB_WR_FAST_REG_MR;
send->s_fast_reg_wr.length = len;
send->s_fast_reg_wr.rkey = send->s_mr->rkey;
send->s_fast_reg_wr.page_list = send->s_page_list;
send->s_fast_reg_wr.page_list_len = nent;
send->s_fast_reg_wr.page_shift = PAGE_SHIFT;
send->s_fast_reg_wr.access_flags = IB_ACCESS_REMOTE_WRITE;
send->s_fast_reg_wr.iova_start = sg_addr;
int n;
n = ib_map_mr_sg(send->s_mr, sg, sg_nents, PAGE_SIZE);
if (unlikely(n != sg_nents))
return n < 0 ? n : -EINVAL;
send->s_reg_wr.wr.opcode = IB_WR_REG_MR;
send->s_reg_wr.wr.wr_id = 0;
send->s_reg_wr.wr.num_sge = 0;
send->s_reg_wr.mr = send->s_mr;
send->s_reg_wr.key = send->s_mr->rkey;
send->s_reg_wr.access = IB_ACCESS_REMOTE_WRITE;
ib_update_fast_reg_key(send->s_mr, send->s_remap_count++);
return 0;
}
int rds_iw_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op)
@ -808,6 +801,7 @@ int rds_iw_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op)
int sent;
int ret;
int num_sge;
int sg_nents;
rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
@ -861,6 +855,7 @@ int rds_iw_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op)
scat = &op->op_sg[0];
sent = 0;
num_sge = op->op_count;
sg_nents = 0;
for (i = 0; i < work_alloc && scat != &op->op_sg[op->op_count]; i++) {
send->s_rdma_wr.wr.send_flags = 0;
@ -904,7 +899,7 @@ int rds_iw_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op)
len = ib_sg_dma_len(ic->i_cm_id->device, scat);
if (send->s_rdma_wr.wr.opcode == IB_WR_RDMA_READ_WITH_INV)
send->s_page_list->page_list[j] = ib_sg_dma_address(ic->i_cm_id->device, scat);
sg_nents++;
else {
send->s_sge[j].addr = ib_sg_dma_address(ic->i_cm_id->device, scat);
send->s_sge[j].length = len;
@ -951,8 +946,12 @@ int rds_iw_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op)
* fastreg_mr (or possibly a dma_mr)
*/
if (!op->op_write) {
rds_iw_build_send_fastreg(rds_iwdev, ic, &ic->i_sends[fr_pos],
op->op_count, sent, conn->c_xmit_rm->m_rs->rs_user_addr);
ret = rds_iw_build_send_reg(&ic->i_sends[fr_pos],
&op->op_sg[0], sg_nents);
if (ret) {
printk(KERN_WARNING "RDS/IW: failed to reg send mem\n");
goto out;
}
work_alloc++;
}