| 60 | } |
| 61 | |
| 62 | static uint32_t |
| 63 | write_scatter_gather_list(uint8_t *work_queue_head_pointer, |
| 64 | uint8_t *work_queue_end_pointer, |
| 65 | uint8_t *work_queue_cur_pointer, |
| 66 | struct gdma_work_request *work_request) |
| 67 | { |
| 68 | struct gdma_sgl_element *sge_list; |
| 69 | struct gdma_sgl_element dummy_sgl[1]; |
| 70 | uint8_t *address; |
| 71 | uint32_t size; |
| 72 | uint32_t num_sge; |
| 73 | uint32_t size_to_queue_end; |
| 74 | uint32_t sge_list_size; |
| 75 | |
| 76 | DP_LOG(DEBUG, "work_queue_cur_pointer %p work_request->flags %x", |
| 77 | work_queue_cur_pointer, work_request->flags); |
| 78 | |
| 79 | num_sge = work_request->num_sgl_elements; |
| 80 | sge_list = work_request->sgl; |
| 81 | size_to_queue_end = (uint32_t)(work_queue_end_pointer - |
| 82 | work_queue_cur_pointer); |
| 83 | |
| 84 | if (num_sge == 0) { |
| 85 | /* Per spec, the case of an empty SGL should be handled as |
| 86 | * follows to avoid corrupted WQE errors: |
| 87 | * Write one dummy SGL entry |
| 88 | * Set the address to 1, leave the rest as 0 |
| 89 | */ |
| 90 | dummy_sgl[num_sge].address = 1; |
| 91 | dummy_sgl[num_sge].size = 0; |
| 92 | dummy_sgl[num_sge].memory_key = 0; |
| 93 | num_sge++; |
| 94 | sge_list = dummy_sgl; |
| 95 | } |
| 96 | |
| 97 | sge_list_size = 0; |
| 98 | { |
| 99 | address = (uint8_t *)sge_list; |
| 100 | size = sizeof(struct gdma_sgl_element) * num_sge; |
| 101 | if (size_to_queue_end < size) { |
| 102 | memcpy(work_queue_cur_pointer, address, |
| 103 | size_to_queue_end); |
| 104 | work_queue_cur_pointer = work_queue_head_pointer; |
| 105 | address += size_to_queue_end; |
| 106 | size -= size_to_queue_end; |
| 107 | } |
| 108 | |
| 109 | memcpy(work_queue_cur_pointer, address, size); |
| 110 | sge_list_size = size; |
| 111 | } |
| 112 | |
| 113 | DP_LOG(DEBUG, "sge %u address 0x%" PRIx64 " size %u key %u list_s %u", |
| 114 | num_sge, sge_list->address, sge_list->size, |
| 115 | sge_list->memory_key, sge_list_size); |
| 116 | |
| 117 | return sge_list_size; |
| 118 | } |
| 119 |
no test coverage detected