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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband

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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband:
  IB/uverbs: Handle large number of entries in poll CQ
This commit is contained in:
Linus Torvalds 2010-12-14 13:34:25 -08:00
commit 7103b71b0f
1 changed files with 59 additions and 46 deletions
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105
drivers/infiniband/core/uverbs_cmd.c
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@ -893,68 +893,81 @@ ssize_t ib_uverbs_resize_cq(struct ib_uverbs_file *file,
return ret ? ret : in_len; return ret ? ret : in_len;
} }
static int copy_wc_to_user(void __user *dest, struct ib_wc *wc)
{
struct ib_uverbs_wc tmp;
tmp.wr_id = wc->wr_id;
tmp.status = wc->status;
tmp.opcode = wc->opcode;
tmp.vendor_err = wc->vendor_err;
tmp.byte_len = wc->byte_len;
tmp.ex.imm_data = (__u32 __force) wc->ex.imm_data;
tmp.qp_num = wc->qp->qp_num;
tmp.src_qp = wc->src_qp;
tmp.wc_flags = wc->wc_flags;
tmp.pkey_index = wc->pkey_index;
tmp.slid = wc->slid;
tmp.sl = wc->sl;
tmp.dlid_path_bits = wc->dlid_path_bits;
tmp.port_num = wc->port_num;
tmp.reserved = 0;
if (copy_to_user(dest, &tmp, sizeof tmp))
return -EFAULT;
return 0;
}
ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file, ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file,
const char __user *buf, int in_len, const char __user *buf, int in_len,
int out_len) int out_len)
{ {
struct ib_uverbs_poll_cq cmd; struct ib_uverbs_poll_cq cmd;
struct ib_uverbs_poll_cq_resp *resp; struct ib_uverbs_poll_cq_resp resp;
u8 __user *header_ptr;
u8 __user *data_ptr;
struct ib_cq *cq; struct ib_cq *cq;
struct ib_wc *wc; struct ib_wc wc;
int ret = 0; int ret;
int i;
int rsize;
if (copy_from_user(&cmd, buf, sizeof cmd)) if (copy_from_user(&cmd, buf, sizeof cmd))
return -EFAULT; return -EFAULT;
wc = kmalloc(cmd.ne * sizeof *wc, GFP_KERNEL);
if (!wc)
return -ENOMEM;
rsize = sizeof *resp + cmd.ne * sizeof(struct ib_uverbs_wc);
resp = kmalloc(rsize, GFP_KERNEL);
if (!resp) {
ret = -ENOMEM;
goto out_wc;
}
cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0); cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
if (!cq) { if (!cq)
ret = -EINVAL; return -EINVAL;
goto out;
/* we copy a struct ib_uverbs_poll_cq_resp to user space */
header_ptr = (void __user *)(unsigned long) cmd.response;
data_ptr = header_ptr + sizeof resp;
memset(&resp, 0, sizeof resp);
while (resp.count < cmd.ne) {
ret = ib_poll_cq(cq, 1, &wc);
if (ret < 0)
goto out_put;
if (!ret)
break;
ret = copy_wc_to_user(data_ptr, &wc);
if (ret)
goto out_put;
data_ptr += sizeof(struct ib_uverbs_wc);
++resp.count;
} }
resp->count = ib_poll_cq(cq, cmd.ne, wc); if (copy_to_user(header_ptr, &resp, sizeof resp)) {
put_cq_read(cq);
for (i = 0; i < resp->count; i++) {
resp->wc[i].wr_id = wc[i].wr_id;
resp->wc[i].status = wc[i].status;
resp->wc[i].opcode = wc[i].opcode;
resp->wc[i].vendor_err = wc[i].vendor_err;
resp->wc[i].byte_len = wc[i].byte_len;
resp->wc[i].ex.imm_data = (__u32 __force) wc[i].ex.imm_data;
resp->wc[i].qp_num = wc[i].qp->qp_num;
resp->wc[i].src_qp = wc[i].src_qp;
resp->wc[i].wc_flags = wc[i].wc_flags;
resp->wc[i].pkey_index = wc[i].pkey_index;
resp->wc[i].slid = wc[i].slid;
resp->wc[i].sl = wc[i].sl;
resp->wc[i].dlid_path_bits = wc[i].dlid_path_bits;
resp->wc[i].port_num = wc[i].port_num;
}
if (copy_to_user((void __user *) (unsigned long) cmd.response, resp, rsize))
ret = -EFAULT; ret = -EFAULT;
goto out_put;
}
out: ret = in_len;
kfree(resp);
out_wc: out_put:
kfree(wc); put_cq_read(cq);
return ret ? ret : in_len; return ret;
} }
ssize_t ib_uverbs_req_notify_cq(struct ib_uverbs_file *file, ssize_t ib_uverbs_req_notify_cq(struct ib_uverbs_file *file,