diff options
| -rw-r--r-- | drivers/infiniband/ulp/iser/iscsi_iser.h | 8 | ||||
| -rw-r--r-- | drivers/infiniband/ulp/iser/iser_initiator.c | 8 | ||||
| -rw-r--r-- | drivers/infiniband/ulp/iser/iser_memory.c | 209 |
3 files changed, 137 insertions, 88 deletions
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h index a39645a..262ba1f 100644 --- a/drivers/infiniband/ulp/iser/iscsi_iser.h +++ b/drivers/infiniband/ulp/iser/iscsi_iser.h @@ -222,12 +222,9 @@ enum iser_data_dir { * @size: num entries of this sg * @data_len: total beffer byte len * @dma_nents: returned by dma_map_sg - * @copy_buf: allocated copy buf for SGs unaligned - * for rdma which are copied * @orig_sg: pointer to the original sg list (in case * we used a copy) - * @sg_single: SG-ified clone of a non SG SC or - * unaligned SG + * @orig_size: num entris of orig sg list */ struct iser_data_buf { struct scatterlist *sg; @@ -235,8 +232,7 @@ struct iser_data_buf { unsigned long data_len; unsigned int dma_nents; struct scatterlist *orig_sg; - char *copy_buf; - struct scatterlist sg_single; + unsigned int orig_size; }; /* fwd declarations */ diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c index b2e3b77..3e2118e 100644 --- a/drivers/infiniband/ulp/iser/iser_initiator.c +++ b/drivers/infiniband/ulp/iser/iser_initiator.c @@ -674,28 +674,28 @@ void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) /* if we were reading, copy back to unaligned sglist, * anyway dma_unmap and free the copy */ - if (iser_task->data[ISER_DIR_IN].copy_buf) { + if (iser_task->data[ISER_DIR_IN].orig_sg) { is_rdma_data_aligned = 0; iser_finalize_rdma_unaligned_sg(iser_task, &iser_task->data[ISER_DIR_IN], ISER_DIR_IN); } - if (iser_task->data[ISER_DIR_OUT].copy_buf) { + if (iser_task->data[ISER_DIR_OUT].orig_sg) { is_rdma_data_aligned = 0; iser_finalize_rdma_unaligned_sg(iser_task, &iser_task->data[ISER_DIR_OUT], ISER_DIR_OUT); } - if (iser_task->prot[ISER_DIR_IN].copy_buf) { + if (iser_task->prot[ISER_DIR_IN].orig_sg) { is_rdma_prot_aligned = 0; iser_finalize_rdma_unaligned_sg(iser_task, &iser_task->prot[ISER_DIR_IN], ISER_DIR_IN); } - if (iser_task->prot[ISER_DIR_OUT].copy_buf) { + if (iser_task->prot[ISER_DIR_OUT].orig_sg) { is_rdma_prot_aligned = 0; iser_finalize_rdma_unaligned_sg(iser_task, &iser_task->prot[ISER_DIR_OUT], diff --git a/drivers/infiniband/ulp/iser/iser_memory.c b/drivers/infiniband/ulp/iser/iser_memory.c index abc979e..f0cdc96 100644 --- a/drivers/infiniband/ulp/iser/iser_memory.c +++ b/drivers/infiniband/ulp/iser/iser_memory.c @@ -39,7 +39,112 @@ #include "iscsi_iser.h" -#define ISER_KMALLOC_THRESHOLD 0x20000 /* 128K - kmalloc limit */ +static void +iser_free_bounce_sg(struct iser_data_buf *data) +{ + struct scatterlist *sg; + int count; + + for_each_sg(data->sg, sg, data->size, count) + __free_page(sg_page(sg)); + + kfree(data->sg); + + data->sg = data->orig_sg; + data->size = data->orig_size; + data->orig_sg = NULL; + data->orig_size = 0; +} + +static int +iser_alloc_bounce_sg(struct iser_data_buf *data) +{ + struct scatterlist *sg; + struct page *page; + unsigned long length = data->data_len; + int i = 0, nents = DIV_ROUND_UP(length, PAGE_SIZE); + + sg = kcalloc(nents, sizeof(*sg), GFP_ATOMIC); + if (!sg) + goto err; + + sg_init_table(sg, nents); + while (length) { + u32 page_len = min_t(u32, length, PAGE_SIZE); + + page = alloc_page(GFP_ATOMIC); + if (!page) + goto err; + + sg_set_page(&sg[i], page, page_len, 0); + length -= page_len; + i++; + } + + data->orig_sg = data->sg; + data->orig_size = data->size; + data->sg = sg; + data->size = nents; + + return 0; + +err: + for (; i > 0; i--) + __free_page(sg_page(&sg[i - 1])); + kfree(sg); + + return -ENOMEM; +} + +static void +iser_copy_bounce(struct iser_data_buf *data, bool to_buffer) +{ + struct scatterlist *osg, *bsg = data->sg; + void *oaddr, *baddr; + unsigned int left = data->data_len; + unsigned int bsg_off = 0; + int i; + + for_each_sg(data->orig_sg, osg, data->orig_size, i) { + unsigned int copy_len, osg_off = 0; + + oaddr = kmap_atomic(sg_page(osg)) + osg->offset; + copy_len = min(left, osg->length); + while (copy_len) { + unsigned int len = min(copy_len, bsg->length - bsg_off); + + baddr = kmap_atomic(sg_page(bsg)) + bsg->offset; + if (to_buffer) + memcpy(baddr + bsg_off, oaddr + osg_off, len); + else + memcpy(oaddr + osg_off, baddr + bsg_off, len); + + kunmap_atomic(baddr - bsg->offset); + osg_off += len; + bsg_off += len; + copy_len -= len; + + if (bsg_off >= bsg->length) { + bsg = sg_next(bsg); + bsg_off = 0; + } + } + kunmap_atomic(oaddr - osg->offset); + left -= osg_off; + } +} + +static inline void +iser_copy_from_bounce(struct iser_data_buf *data) +{ + iser_copy_bounce(data, false); +} + +static inline void +iser_copy_to_bounce(struct iser_data_buf *data) +{ + iser_copy_bounce(data, true); +} struct fast_reg_descriptor * iser_reg_desc_get(struct ib_conn *ib_conn) @@ -75,52 +180,32 @@ static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, enum iser_data_dir cmd_dir) { struct ib_device *dev = iser_task->iser_conn->ib_conn.device->ib_device; - struct scatterlist *sgl = data->sg; - struct scatterlist *sg; - char *mem = NULL; - unsigned long cmd_data_len = data->data_len; - int dma_nents, i; - - if (cmd_data_len > ISER_KMALLOC_THRESHOLD) - mem = (void *)__get_free_pages(GFP_ATOMIC, - ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT); - else - mem = kmalloc(cmd_data_len, GFP_ATOMIC); + int rc; - if (mem == NULL) { - iser_err("Failed to allocate mem size %d %d for copying sglist\n", - data->size, (int)cmd_data_len); - return -ENOMEM; + rc = iser_alloc_bounce_sg(data); + if (rc) { + iser_err("Failed to allocate bounce for data len %lu\n", + data->data_len); + return rc; } - if (cmd_dir == ISER_DIR_OUT) { - /* copy the unaligned sg the buffer which is used for RDMA */ - char *p, *from; - - sgl = data->sg; - p = mem; - for_each_sg(sgl, sg, data->size, i) { - from = kmap_atomic(sg_page(sg)); - memcpy(p, - from + sg->offset, - sg->length); - kunmap_atomic(from); - p += sg->length; - } - } - - sg_init_one(&data->sg_single, mem, cmd_data_len); - data->orig_sg = data->sg; - data->sg = &data->sg_single; - data->copy_buf = mem; - dma_nents = ib_dma_map_sg(dev, data->sg, 1, - (cmd_dir == ISER_DIR_OUT) ? - DMA_TO_DEVICE : DMA_FROM_DEVICE); - BUG_ON(dma_nents == 0); + if (cmd_dir == ISER_DIR_OUT) + iser_copy_to_bounce(data); - data->dma_nents = dma_nents; + data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size, + (cmd_dir == ISER_DIR_OUT) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE); + if (!data->dma_nents) { + iser_err("Got dma_nents %d, something went wrong...\n", + data->dma_nents); + rc = -ENOMEM; + goto err; + } return 0; +err: + iser_free_bounce_sg(data); + return rc; } /** @@ -131,48 +216,16 @@ void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, struct iser_data_buf *data, enum iser_data_dir cmd_dir) { - struct ib_device *dev; - unsigned long cmd_data_len; - - dev = iser_task->iser_conn->ib_conn.device->ib_device; + struct ib_device *dev = iser_task->iser_conn->ib_conn.device->ib_device; - ib_dma_unmap_sg(dev, data->sg, 1, + ib_dma_unmap_sg(dev, data->sg, data->size, (cmd_dir == ISER_DIR_OUT) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); - if (cmd_dir == ISER_DIR_IN) { - char *mem; - struct scatterlist *sgl, *sg; - unsigned char *p, *to; - unsigned int sg_size; - int i; - - /* copy back read RDMA to unaligned sg */ - mem = data->copy_buf; - - sgl = data->sg; - sg_size = data->size; - - p = mem; - for_each_sg(sgl, sg, sg_size, i) { - to = kmap_atomic(sg_page(sg)); - memcpy(to + sg->offset, - p, - sg->length); - kunmap_atomic(to); - p += sg->length; - } - } - - cmd_data_len = data->data_len; - - if (cmd_data_len > ISER_KMALLOC_THRESHOLD) - free_pages((unsigned long)data->copy_buf, - ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT); - else - kfree(data->copy_buf); + if (cmd_dir == ISER_DIR_IN) + iser_copy_from_bounce(data); - data->copy_buf = NULL; + iser_free_bounce_sg(data); } #define IS_4K_ALIGNED(addr) ((((unsigned long)addr) & ~MASK_4K) == 0) |