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svcrdma: Remove frmr cache 

Clean up: Now that the svc_rdma_recvfrom path uses the rdma_rw API,
the details of Read sink buffer registration are dealt with by the
kernel's RDMA core. This cache is no longer used, and can be
removed.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever 2017-06-23 17:18:57 -04:00 committed by J. Bruce Fields
parent c84dc900d7
commit 463e63d701
2 changed files with 0 additions and 104 deletions
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18
include/linux/sunrpc/svc_rdma.h
View File

@ -77,7 +77,6 @@ extern atomic_t rdma_stat_sq_prod;
*/
struct svc_rdma_op_ctxt {
struct list_head list;
struct svc_rdma_fastreg_mr *frmr;
struct xdr_buf arg;
struct ib_cqe cqe;
u32 byte_len;
@ -91,17 +90,6 @@ struct svc_rdma_op_ctxt {
struct page *pages[RPCSVC_MAXPAGES];
};
struct svc_rdma_fastreg_mr {
struct ib_mr *mr;
struct scatterlist *sg;
int sg_nents;
unsigned long access_flags;
enum dma_data_direction direction;
struct list_head frmr_list;
};
#define RDMACTXT_F_LAST_CTXT 2
#define SVCRDMA_DEVCAP_FAST_REG 1 /* fast mr registration */
#define SVCRDMA_DEVCAP_READ_W_INV 2 /* read w/ invalidate */
@ -136,9 +124,6 @@ struct svcxprt_rdma {
struct ib_cq *sc_rq_cq;
struct ib_cq *sc_sq_cq;
u32 sc_dev_caps; /* distilled device caps */
unsigned int sc_frmr_pg_list_len;
struct list_head sc_frmr_q;
spinlock_t sc_frmr_q_lock;
spinlock_t sc_lock; /* transport lock */
@ -210,9 +195,6 @@ extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
extern struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *);
extern void svc_rdma_put_context(struct svc_rdma_op_ctxt *, int);
extern void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt);
extern struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *);
extern void svc_rdma_put_frmr(struct svcxprt_rdma *,
struct svc_rdma_fastreg_mr *);
extern void svc_sq_reap(struct svcxprt_rdma *);
extern void svc_rq_reap(struct svcxprt_rdma *);
extern void svc_rdma_prep_reply_hdr(struct svc_rqst *);

86
net/sunrpc/xprtrdma/svc_rdma_transport.c
View File

@ -202,7 +202,6 @@ struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
out:
ctxt->count = 0;
ctxt->mapped_sges = 0;
ctxt->frmr = NULL;
return ctxt;
out_empty:
@ -387,14 +386,12 @@ static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);
INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q);
INIT_LIST_HEAD(&cma_xprt->sc_frmr_q);
INIT_LIST_HEAD(&cma_xprt->sc_ctxts);
INIT_LIST_HEAD(&cma_xprt->sc_rw_ctxts);
init_waitqueue_head(&cma_xprt->sc_send_wait);
spin_lock_init(&cma_xprt->sc_lock);
spin_lock_init(&cma_xprt->sc_rq_dto_lock);
spin_lock_init(&cma_xprt->sc_frmr_q_lock);
spin_lock_init(&cma_xprt->sc_ctxt_lock);
spin_lock_init(&cma_xprt->sc_rw_ctxt_lock);
@ -705,86 +702,6 @@ static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
return ERR_PTR(ret);
}
static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt)
{
struct ib_mr *mr;
struct scatterlist *sg;
struct svc_rdma_fastreg_mr *frmr;
u32 num_sg;
frmr = kmalloc(sizeof(*frmr), GFP_KERNEL);
if (!frmr)
goto err;
num_sg = min_t(u32, RPCSVC_MAXPAGES, xprt->sc_frmr_pg_list_len);
mr = ib_alloc_mr(xprt->sc_pd, IB_MR_TYPE_MEM_REG, num_sg);
if (IS_ERR(mr))
goto err_free_frmr;
sg = kcalloc(RPCSVC_MAXPAGES, sizeof(*sg), GFP_KERNEL);
if (!sg)
goto err_free_mr;
sg_init_table(sg, RPCSVC_MAXPAGES);
frmr->mr = mr;
frmr->sg = sg;
INIT_LIST_HEAD(&frmr->frmr_list);
return frmr;
err_free_mr:
ib_dereg_mr(mr);
err_free_frmr:
kfree(frmr);
err:
return ERR_PTR(-ENOMEM);
}
static void rdma_dealloc_frmr_q(struct svcxprt_rdma *xprt)
{
struct svc_rdma_fastreg_mr *frmr;
while (!list_empty(&xprt->sc_frmr_q)) {
frmr = list_entry(xprt->sc_frmr_q.next,
struct svc_rdma_fastreg_mr, frmr_list);
list_del_init(&frmr->frmr_list);
kfree(frmr->sg);
ib_dereg_mr(frmr->mr);
kfree(frmr);
}
}
struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma)
{
struct svc_rdma_fastreg_mr *frmr = NULL;
spin_lock(&rdma->sc_frmr_q_lock);
if (!list_empty(&rdma->sc_frmr_q)) {
frmr = list_entry(rdma->sc_frmr_q.next,
struct svc_rdma_fastreg_mr, frmr_list);
list_del_init(&frmr->frmr_list);
frmr->sg_nents = 0;
}
spin_unlock(&rdma->sc_frmr_q_lock);
if (frmr)
return frmr;
return rdma_alloc_frmr(rdma);
}
void svc_rdma_put_frmr(struct svcxprt_rdma *rdma,
struct svc_rdma_fastreg_mr *frmr)
{
if (frmr) {
ib_dma_unmap_sg(rdma->sc_cm_id->device,
frmr->sg, frmr->sg_nents, frmr->direction);
spin_lock(&rdma->sc_frmr_q_lock);
WARN_ON_ONCE(!list_empty(&frmr->frmr_list));
list_add(&frmr->frmr_list, &rdma->sc_frmr_q);
spin_unlock(&rdma->sc_frmr_q_lock);
}
}
/*
* This is the xpo_recvfrom function for listening endpoints. Its
* purpose is to accept incoming connections. The CMA callback handler
@ -922,8 +839,6 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
* of an RDMA_READ. IB does not.
*/
if (dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
newxprt->sc_frmr_pg_list_len =
dev->attrs.max_fast_reg_page_list_len;
newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_FAST_REG;
} else
newxprt->sc_snd_w_inv = false;
@ -1063,7 +978,6 @@ static void __svc_rdma_free(struct work_struct *work)
xprt->xpt_bc_xprt = NULL;
}
rdma_dealloc_frmr_q(rdma);
svc_rdma_destroy_rw_ctxts(rdma);
svc_rdma_destroy_ctxts(rdma);