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Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 X-Mailman-Approved-At: Thu, 20 Apr 2023 06:57:04 +0000 Subject: [dm-devel] [PATCH v10 9/9] null_blk: add support for copy offload X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Vincent Fu , bvanassche@acm.org, joshi.k@samsung.com, gost.dev@samsung.com, anuj20.g@samsung.com, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, ming.lei@redhat.com, linux-block@vger.kernel.org, dlemoal@kernel.org, Nitesh Shetty , linux-fsdevel@vger.kernel.org, Damien Le Moal , nitheshshetty@gmail.com Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: samsung.com Implementaion is based on existing read and write infrastructure. copy_max_bytes: A new configfs and module parameter is introduced, which can be used to set hardware/driver supported maximum copy limit. Suggested-by: Damien Le Moal Signed-off-by: Anuj Gupta Signed-off-by: Nitesh Shetty Signed-off-by: Vincent Fu --- drivers/block/null_blk/main.c | 108 ++++++++++++++++++++++++++++-- drivers/block/null_blk/null_blk.h | 8 +++ 2 files changed, 111 insertions(+), 5 deletions(-) diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c index 5d54834d8690..9028aae1efbd 100644 --- a/drivers/block/null_blk/main.c +++ b/drivers/block/null_blk/main.c @@ -157,6 +157,10 @@ static int g_max_sectors; module_param_named(max_sectors, g_max_sectors, int, 0444); MODULE_PARM_DESC(max_sectors, "Maximum size of a command (in 512B sectors)"); +static unsigned long g_copy_max_bytes = COPY_MAX_BYTES; +module_param_named(copy_max_bytes, g_copy_max_bytes, ulong, 0444); +MODULE_PARM_DESC(copy_max_bytes, "Maximum size of a copy command (in bytes)"); + static unsigned int nr_devices = 1; module_param(nr_devices, uint, 0444); MODULE_PARM_DESC(nr_devices, "Number of devices to register"); @@ -409,6 +413,7 @@ NULLB_DEVICE_ATTR(home_node, uint, NULL); NULLB_DEVICE_ATTR(queue_mode, uint, NULL); NULLB_DEVICE_ATTR(blocksize, uint, NULL); NULLB_DEVICE_ATTR(max_sectors, uint, NULL); +NULLB_DEVICE_ATTR(copy_max_bytes, uint, NULL); NULLB_DEVICE_ATTR(irqmode, uint, NULL); NULLB_DEVICE_ATTR(hw_queue_depth, uint, NULL); NULLB_DEVICE_ATTR(index, uint, NULL); @@ -550,6 +555,7 @@ static struct configfs_attribute *nullb_device_attrs[] = { &nullb_device_attr_queue_mode, &nullb_device_attr_blocksize, &nullb_device_attr_max_sectors, + &nullb_device_attr_copy_max_bytes, &nullb_device_attr_irqmode, &nullb_device_attr_hw_queue_depth, &nullb_device_attr_index, @@ -656,7 +662,8 @@ static ssize_t memb_group_features_show(struct config_item *item, char *page) "poll_queues,power,queue_mode,shared_tag_bitmap,size," "submit_queues,use_per_node_hctx,virt_boundary,zoned," "zone_capacity,zone_max_active,zone_max_open," - "zone_nr_conv,zone_offline,zone_readonly,zone_size\n"); + "zone_nr_conv,zone_offline,zone_readonly,zone_size," + "copy_max_bytes\n"); } CONFIGFS_ATTR_RO(memb_group_, features); @@ -722,6 +729,7 @@ static struct nullb_device *null_alloc_dev(void) dev->queue_mode = g_queue_mode; dev->blocksize = g_bs; dev->max_sectors = g_max_sectors; + dev->copy_max_bytes = g_copy_max_bytes; dev->irqmode = g_irqmode; dev->hw_queue_depth = g_hw_queue_depth; dev->blocking = g_blocking; @@ -1271,6 +1279,78 @@ static int null_transfer(struct nullb *nullb, struct page *page, return err; } +static inline void nullb_setup_copy_read(struct nullb *nullb, struct bio *bio) +{ + struct nullb_copy_token *token = bvec_kmap_local(&bio->bi_io_vec[0]); + + token->subsys = "nullb"; + token->sector_in = bio->bi_iter.bi_sector; + token->nullb = nullb; + token->sectors = bio->bi_iter.bi_size >> SECTOR_SHIFT; +} + +static inline int nullb_setup_copy_write(struct nullb *nullb, + struct bio *bio, bool is_fua) +{ + struct nullb_copy_token *token = bvec_kmap_local(&bio->bi_io_vec[0]); + sector_t sector_in, sector_out; + void *in, *out; + size_t rem, temp; + unsigned long offset_in, offset_out; + struct nullb_page *t_page_in, *t_page_out; + int ret = -EIO; + + if (unlikely(memcmp(token->subsys, "nullb", 5))) + return -EINVAL; + if (unlikely(token->nullb != nullb)) + return -EINVAL; + if (WARN_ON(token->sectors != bio->bi_iter.bi_size >> SECTOR_SHIFT)) + return -EINVAL; + + sector_in = token->sector_in; + sector_out = bio->bi_iter.bi_sector; + rem = token->sectors << SECTOR_SHIFT; + + spin_lock_irq(&nullb->lock); + while (rem > 0) { + temp = min_t(size_t, nullb->dev->blocksize, rem); + offset_in = (sector_in & SECTOR_MASK) << SECTOR_SHIFT; + offset_out = (sector_out & SECTOR_MASK) << SECTOR_SHIFT; + + if (null_cache_active(nullb) && !is_fua) + null_make_cache_space(nullb, PAGE_SIZE); + + t_page_in = null_lookup_page(nullb, sector_in, false, + !null_cache_active(nullb)); + if (!t_page_in) + goto err; + t_page_out = null_insert_page(nullb, sector_out, + !null_cache_active(nullb) || is_fua); + if (!t_page_out) + goto err; + + in = kmap_local_page(t_page_in->page); + out = kmap_local_page(t_page_out->page); + + memcpy(out + offset_out, in + offset_in, temp); + kunmap_local(out); + kunmap_local(in); + __set_bit(sector_out & SECTOR_MASK, t_page_out->bitmap); + + if (is_fua) + null_free_sector(nullb, sector_out, true); + + rem -= temp; + sector_in += temp >> SECTOR_SHIFT; + sector_out += temp >> SECTOR_SHIFT; + } + + ret = 0; +err: + spin_unlock_irq(&nullb->lock); + return ret; +} + static int null_handle_rq(struct nullb_cmd *cmd) { struct request *rq = cmd->rq; @@ -1280,13 +1360,20 @@ static int null_handle_rq(struct nullb_cmd *cmd) sector_t sector = blk_rq_pos(rq); struct req_iterator iter; struct bio_vec bvec; + bool fua = rq->cmd_flags & REQ_FUA; + + if (rq->cmd_flags & REQ_COPY) { + if (op_is_write(req_op(rq))) + return nullb_setup_copy_write(nullb, rq->bio, fua); + nullb_setup_copy_read(nullb, rq->bio); + return 0; + } spin_lock_irq(&nullb->lock); rq_for_each_segment(bvec, rq, iter) { len = bvec.bv_len; err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, - op_is_write(req_op(rq)), sector, - rq->cmd_flags & REQ_FUA); + op_is_write(req_op(rq)), sector, fua); if (err) { spin_unlock_irq(&nullb->lock); return err; @@ -1307,13 +1394,20 @@ static int null_handle_bio(struct nullb_cmd *cmd) sector_t sector = bio->bi_iter.bi_sector; struct bio_vec bvec; struct bvec_iter iter; + bool fua = bio->bi_opf & REQ_FUA; + + if (bio->bi_opf & REQ_COPY) { + if (op_is_write(bio_op(bio))) + return nullb_setup_copy_write(nullb, bio, fua); + nullb_setup_copy_read(nullb, bio); + return 0; + } spin_lock_irq(&nullb->lock); bio_for_each_segment(bvec, bio, iter) { len = bvec.bv_len; err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, - op_is_write(bio_op(bio)), sector, - bio->bi_opf & REQ_FUA); + op_is_write(bio_op(bio)), sector, fua); if (err) { spin_unlock_irq(&nullb->lock); return err; @@ -2157,6 +2251,10 @@ static int null_add_dev(struct nullb_device *dev) dev->max_sectors = queue_max_hw_sectors(nullb->q); dev->max_sectors = min(dev->max_sectors, BLK_DEF_MAX_SECTORS); blk_queue_max_hw_sectors(nullb->q, dev->max_sectors); + blk_queue_max_copy_sectors_hw(nullb->q, + dev->copy_max_bytes >> SECTOR_SHIFT); + if (dev->copy_max_bytes) + blk_queue_flag_set(QUEUE_FLAG_COPY, nullb->disk->queue); if (dev->virt_boundary) blk_queue_virt_boundary(nullb->q, PAGE_SIZE - 1); diff --git a/drivers/block/null_blk/null_blk.h b/drivers/block/null_blk/null_blk.h index 929f659dd255..3dda593b0747 100644 --- a/drivers/block/null_blk/null_blk.h +++ b/drivers/block/null_blk/null_blk.h @@ -67,6 +67,13 @@ enum { NULL_Q_MQ = 2, }; +struct nullb_copy_token { + char *subsys; + struct nullb *nullb; + sector_t sector_in; + sector_t sectors; +}; + struct nullb_device { struct nullb *nullb; struct config_group group; @@ -107,6 +114,7 @@ struct nullb_device { unsigned int queue_mode; /* block interface */ unsigned int blocksize; /* block size */ unsigned int max_sectors; /* Max sectors per command */ + unsigned long copy_max_bytes; /* Max copy offload length in bytes */ unsigned int irqmode; /* IRQ completion handler */ unsigned int hw_queue_depth; /* queue depth */ unsigned int index; /* index of the disk, only valid with a disk */