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RDMA/iw_cxgb4: Low resource fixes for Completion queue

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Pre-allocate buffers to deallocate completion queue, so that completion
queue is deallocated during RDMA termination when system is running
out of memory.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Hariprasad S 2016-06-10 01:05:17 +05:30 committed by Doug Ledford
parent 0f8ab0b6e9
commit dd6b024126
2 changed files with 26 additions and 17 deletions
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42
drivers/infiniband/hw/cxgb4/cq.c
View File

@ -33,19 +33,15 @@
#include "iw_cxgb4.h"
static int destroy_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
struct c4iw_dev_ucontext *uctx)
struct c4iw_dev_ucontext *uctx, struct sk_buff *skb)
{
struct fw_ri_res_wr *res_wr;
struct fw_ri_res *res;
int wr_len;
struct c4iw_wr_wait wr_wait;
struct sk_buff *skb;
int ret;
wr_len = sizeof *res_wr + sizeof *res;
skb = alloc_skb(wr_len, GFP_KERNEL);
if (!skb)
return -ENOMEM;
set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
res_wr = (struct fw_ri_res_wr *)__skb_put(skb, wr_len);
@ -863,7 +859,9 @@ int c4iw_destroy_cq(struct ib_cq *ib_cq)
ucontext = ib_cq->uobject ? to_c4iw_ucontext(ib_cq->uobject->context)
: NULL;
destroy_cq(&chp->rhp->rdev, &chp->cq,
ucontext ? &ucontext->uctx : &chp->cq.rdev->uctx);
ucontext ? &ucontext->uctx : &chp->cq.rdev->uctx,
chp->destroy_skb);
chp->destroy_skb = NULL;
kfree(chp);
return 0;
}
@ -879,7 +877,7 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev,
struct c4iw_cq *chp;
struct c4iw_create_cq_resp uresp;
struct c4iw_ucontext *ucontext = NULL;
int ret;
int ret, wr_len;
size_t memsize, hwentries;
struct c4iw_mm_entry *mm, *mm2;
@ -896,6 +894,13 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev,
if (!chp)
return ERR_PTR(-ENOMEM);
wr_len = sizeof(struct fw_ri_res_wr) + sizeof(struct fw_ri_res);
chp->destroy_skb = alloc_skb(wr_len, GFP_KERNEL);
if (!chp->destroy_skb) {
ret = -ENOMEM;
goto err1;
}
if (ib_context)
ucontext = to_c4iw_ucontext(ib_context);
@ -936,7 +941,7 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev,
ret = create_cq(&rhp->rdev, &chp->cq,
ucontext ? &ucontext->uctx : &rhp->rdev.uctx);
if (ret)
goto err1;
goto err2;
chp->rhp = rhp;
chp->cq.size--; /* status page */
@ -947,15 +952,15 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev,
init_waitqueue_head(&chp->wait);
ret = insert_handle(rhp, &rhp->cqidr, chp, chp->cq.cqid);
if (ret)
goto err2;
goto err3;
if (ucontext) {
mm = kmalloc(sizeof *mm, GFP_KERNEL);
if (!mm)
goto err3;
goto err4;
mm2 = kmalloc(sizeof *mm2, GFP_KERNEL);
if (!mm2)
goto err4;
goto err5;
uresp.qid_mask = rhp->rdev.cqmask;
uresp.cqid = chp->cq.cqid;
@ -970,7 +975,7 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev,
ret = ib_copy_to_udata(udata, &uresp,
sizeof(uresp) - sizeof(uresp.reserved));
if (ret)
goto err5;
goto err6;
mm->key = uresp.key;
mm->addr = virt_to_phys(chp->cq.queue);
@ -986,15 +991,18 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev,
__func__, chp->cq.cqid, chp, chp->cq.size,
chp->cq.memsize, (unsigned long long) chp->cq.dma_addr);
return &chp->ibcq;
err5:
err6:
kfree(mm2);
err4:
err5:
kfree(mm);
err3:
err4:
remove_handle(rhp, &rhp->cqidr, chp->cq.cqid);
err2:
err3:
destroy_cq(&chp->rhp->rdev, &chp->cq,
ucontext ? &ucontext->uctx : &rhp->rdev.uctx);
ucontext ? &ucontext->uctx : &rhp->rdev.uctx,
chp->destroy_skb);
err2:
kfree_skb(chp->destroy_skb);
err1:
kfree(chp);
return ERR_PTR(ret);

1
drivers/infiniband/hw/cxgb4/iw_cxgb4.h
View File

@ -414,6 +414,7 @@ static inline struct c4iw_mw *to_c4iw_mw(struct ib_mw *ibmw)
struct c4iw_cq {
struct ib_cq ibcq;
struct c4iw_dev *rhp;
struct sk_buff *destroy_skb;
struct t4_cq cq;
spinlock_t lock;
spinlock_t comp_handler_lock;