nvmet/rdma: Use sgl_alloc() and sgl_free()

Use the sgl_alloc() and sgl_free() functions instead of open coding
these functions.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

2 files changed, 5 insertions, 59 deletions

diff --git a/drivers/nvme/target/Kconfig b/drivers/nvme/target/Kconfig
index 4d9715630e21..5f4f8b16685f 100644
--- a/drivers/nvme/target/Kconfig
+++ b/drivers/nvme/target/Kconfig
@@ -29,6 +29,7 @@ config NVME_TARGET_RDMA
         tristate "NVMe over Fabrics RDMA target support"
         depends on INFINIBAND
         depends on NVME_TARGET
+        select SGL_ALLOC
         help
           This enables the NVMe RDMA target support, which allows exporting NVMe
           devices over RDMA.
diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index 49912909c298..0e4c15754c58 100644
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -185,59 +185,6 @@ nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp)
         spin_unlock_irqrestore(&rsp->queue->rsps_lock, flags);
 }
 
-static void nvmet_rdma_free_sgl(struct scatterlist *sgl, unsigned int nents)
-{
-        struct scatterlist *sg;
-        int count;
-
-        if (!sgl || !nents)
-                return;
-
-        for_each_sg(sgl, sg, nents, count)
-                __free_page(sg_page(sg));
-        kfree(sgl);
-}
-
-static int nvmet_rdma_alloc_sgl(struct scatterlist **sgl, unsigned int *nents,
-                u32 length)
-{
-        struct scatterlist *sg;
-        struct page *page;
-        unsigned int nent;
-        int i = 0;
-
-        nent = DIV_ROUND_UP(length, PAGE_SIZE);
-        sg = kmalloc_array(nent, sizeof(struct scatterlist), GFP_KERNEL);
-        if (!sg)
-                goto out;
-
-        sg_init_table(sg, nent);
-
-        while (length) {
-                u32 page_len = min_t(u32, length, PAGE_SIZE);
-
-                page = alloc_page(GFP_KERNEL);
-                if (!page)
-                        goto out_free_pages;
-
-                sg_set_page(&sg[i], page, page_len, 0);
-                length -= page_len;
-                i++;
-        }
-        *sgl = sg;
-        *nents = nent;
-        return 0;
-
-out_free_pages:
-        while (i > 0) {
-                i--;
-                __free_page(sg_page(&sg[i]));
-        }
-        kfree(sg);
-out:
-        return NVME_SC_INTERNAL;
-}
-
 static int nvmet_rdma_alloc_cmd(struct nvmet_rdma_device *ndev,
                         struct nvmet_rdma_cmd *c, bool admin)
 {
@@ -484,7 +431,7 @@ static void nvmet_rdma_release_rsp(struct nvmet_rdma_rsp *rsp)
         }
 
         if (rsp->req.sg != &rsp->cmd->inline_sg)
-                nvmet_rdma_free_sgl(rsp->req.sg, rsp->req.sg_cnt);
+                sgl_free(rsp->req.sg);
 
         if (unlikely(!list_empty_careful(&queue->rsp_wr_wait_list)))
                 nvmet_rdma_process_wr_wait_list(queue);
@@ -621,16 +568,14 @@ static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp,
         u32 len = get_unaligned_le24(sgl->length);
         u32 key = get_unaligned_le32(sgl->key);
         int ret;
-        u16 status;
 
         /* no data command? */
         if (!len)
                 return 0;
 
-        status = nvmet_rdma_alloc_sgl(&rsp->req.sg, &rsp->req.sg_cnt,
-                        len);
-        if (status)
-                return status;
+        rsp->req.sg = sgl_alloc(len, GFP_KERNEL, &rsp->req.sg_cnt);
+        if (!rsp->req.sg)
+                return NVME_SC_INTERNAL;
 
         ret = rdma_rw_ctx_init(&rsp->rw, cm_id->qp, cm_id->port_num,
                         rsp->req.sg, rsp->req.sg_cnt, 0, addr, key,