diff options
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/server.c | 62 |
1 files changed, 38 insertions, 24 deletions
diff --git a/samples/server.c b/samples/server.c index e059d9c..37c5d78 100644 --- a/samples/server.c +++ b/samples/server.c @@ -196,42 +196,56 @@ dma_unregister(vfu_ctx_t *vfu_ctx, vfu_dma_info_t *info) */ static void do_dma_io(vfu_ctx_t *vfu_ctx, struct server_data *server_data) { - int count = 4096; - unsigned char buf[count]; + const int size = 1024; + const int count = 4; + unsigned char buf[size * count]; uint32_t crc1, crc2; dma_sg_t *sg; + void *addr; int ret; sg = alloca(dma_sg_size()); assert(vfu_ctx != NULL); - ret = vfu_addr_to_sgl(vfu_ctx, - (vfu_dma_addr_t)server_data->regions[0].iova.iov_base, - count, sg, 1, PROT_WRITE); - if (ret < 0) { - err(EXIT_FAILURE, "failed to map %p-%p", - server_data->regions[0].iova.iov_base, - server_data->regions[0].iova.iov_base + count -1); - } + /* Write some data, chunked into multiple calls to exercise offsets. */ + for (int i = 0; i < count; ++i) { + addr = server_data->regions[0].iova.iov_base + i * size; + ret = vfu_addr_to_sgl(vfu_ctx, (vfu_dma_addr_t)addr, size, sg, 1, + PROT_WRITE); + if (ret < 0) { + err(EXIT_FAILURE, "failed to map %p-%p", addr, addr + size - 1); + } - memset(buf, 'A', count); - crc1 = rte_hash_crc(buf, count, 0); - vfu_log(vfu_ctx, LOG_DEBUG, "%s: WRITE addr %p count %d", __func__, - server_data->regions[0].iova.iov_base, count); - ret = vfu_sgl_write(vfu_ctx, sg, 1, buf); - if (ret < 0) { - err(EXIT_FAILURE, "vfu_sgl_write failed"); + memset(&buf[i * size], 'A' + i, size); + vfu_log(vfu_ctx, LOG_DEBUG, "%s: WRITE addr %p size %d", __func__, addr, + size); + ret = vfu_sgl_write(vfu_ctx, sg, 1, &buf[i * size]); + if (ret < 0) { + err(EXIT_FAILURE, "vfu_sgl_write failed"); + } } - memset(buf, 0, count); - vfu_log(vfu_ctx, LOG_DEBUG, "%s: READ addr %p count %d", __func__, - server_data->regions[0].iova.iov_base, count); - ret = vfu_sgl_read(vfu_ctx, sg, 1, buf); - if (ret < 0) { - err(EXIT_FAILURE, "vfu_sgl_read failed"); + crc1 = rte_hash_crc(buf, sizeof(buf), 0); + + /* Read the data back at double the chunk size. */ + memset(buf, 0, sizeof(buf)); + for (int i = 0; i < count; i += 2) { + addr = server_data->regions[0].iova.iov_base + i * size; + ret = vfu_addr_to_sgl(vfu_ctx, (vfu_dma_addr_t)addr, size * 2, sg, 1, + PROT_READ); + if (ret < 0) { + err(EXIT_FAILURE, "failed to map %p-%p", addr, addr + 2 * size - 1); + } + vfu_log(vfu_ctx, LOG_DEBUG, "%s: READ addr %p size %d", __func__, addr, + 2 * size); + ret = vfu_sgl_read(vfu_ctx, sg, 1, &buf[i * size]); + if (ret < 0) { + err(EXIT_FAILURE, "vfu_sgl_read failed"); + } } - crc2 = rte_hash_crc(buf, count, 0); + + crc2 = rte_hash_crc(buf, sizeof(buf), 0); if (crc1 != crc2) { errx(EXIT_FAILURE, "DMA write and DMA read mismatch"); |