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Jag/use size examples io #14

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Jag/use size examples io #14

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be6d1e1
examples/io: Use op_len as transfer size
Joelgranados May 27, 2024
66e71c1
examples/io: Calculate and forward size in number of LBAs
Joelgranados May 27, 2024
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46 changes: 41 additions & 5 deletions examples/io.c
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,36 @@ static struct opt_table opts[] = {
OPT_ENDTABLE,
};

unsigned int get_lb_bytes(struct nvme_ctrl *ctrl, unsigned long nsid)
{
void *vaddr;
ssize_t len;
union nvme_cmd cmd;
struct nvme_id_ns *id_ns;
struct nvme_lbaf *lbaf;
unsigned int lb_bytes;

len = pgmap(&vaddr, NVME_IDENTIFY_DATA_SIZE);
if (len < 0)
err(1, "could not allocate aligned memory");

cmd.identify = (struct nvme_cmd_identify) {
.opcode = nvme_admin_identify,
.cns = NVME_IDENTIFY_CNS_NS,
.nsid = cpu_to_le32(nsid),
};

if (nvme_admin(ctrl, &cmd, vaddr, len, NULL))
err(1, "nvme_admin");

id_ns = vaddr;
lbaf = &id_ns->lbaf[id_ns->flbas];
lb_bytes = 1ULL << lbaf->ds;

pgunmap(vaddr, len);
return lb_bytes;
}

int main(int argc, char **argv)
{
void *vaddr;
Expand All @@ -69,23 +99,28 @@ int main(int argc, char **argv)

opt_free_table();

if (op_len == 0)
op_len = 0x1000;

fd = op_read ? STDOUT_FILENO : STDIN_FILENO;

if (nvme_init(&ctrl, bdf, &ctrl_opts))
err(1, "failed to init nvme controller");

unsigned int lb_nbytes = get_lb_bytes(&ctrl, nsid);

if (nvme_create_ioqpair(&ctrl, 1, 64, -1, 0x0))
err(1, "could not create io queue pair");

vaddr = mmap(NULL, 0x1000, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
vaddr = mmap(NULL, op_len, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);

if (iommu_map_vaddr(__iommu_ctx(&ctrl), vaddr, 0x1000, &iova, 0x0))
if (iommu_map_vaddr(__iommu_ctx(&ctrl), vaddr, op_len, &iova, 0x0))
err(1, "failed to reserve iova");

if (op_write) {
fprintf(stderr, "reading payload\n");

ret = readmaxfd(fd, vaddr, 0x1000);
ret = readmaxfd(fd, vaddr, op_len);
if (ret < 0)
err(1, "could not read fd");

Expand All @@ -97,9 +132,10 @@ int main(int argc, char **argv)
cmd.rw = (struct nvme_cmd_rw) {
.opcode = op_write ? nvme_cmd_write : nvme_cmd_read,
.nsid = cpu_to_le32(nsid),
.nlb = (ROUND_UP(op_len, lb_nbytes)/lb_nbytes) - 1,
};

ret = nvme_rq_map_prp(&ctrl, rq, &cmd, iova, 0x1000);
ret = nvme_rq_map_prp(&ctrl, rq, &cmd, iova, op_len);
if (ret)
err(1, "could not map prps");

Expand All @@ -111,7 +147,7 @@ int main(int argc, char **argv)
if (op_read) {
fprintf(stderr, "writing payload\n");

ret = writeallfd(fd, vaddr, 0x1000);
ret = writeallfd(fd, vaddr, op_len);
if (ret < 0)
err(1, "could not write fd");

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