[SCSI] tgt: fix rdma transfer bugs

- ibmstgt hits the max rdma transfer size (128k).
- libsrp returns a rdma transfer error properly.

Signed-off-by: Bastian Blank <bastian@waldi.eu.org>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/ibmvscsi/ibmvstgt.c b/drivers/scsi/ibmvscsi/ibmvstgt.c
index a7fbd10..84363c1 100644 (file)
--- a/drivers/scsi/ibmvscsi/ibmvstgt.c
+++ b/drivers/scsi/ibmvscsi/ibmvstgt.c
@@ -35,7 +35,7 @@
 #include "ibmvscsi.h"
 
 #define        INITIAL_SRP_LIMIT       16
-#define        DEFAULT_MAX_SECTORS     512
+#define        DEFAULT_MAX_SECTORS     256
 
 #define        TGT_NAME        "ibmvstgt"
 
@@ -248,8 +248,8 @@ static int ibmvstgt_rdma(struct scsi_cmnd *sc, struct scatterlist *sg, int nsg,
                                                  md[i].va + mdone);
 
                        if (err != H_SUCCESS) {
-                               eprintk("rdma error %d %d\n", dir, slen);
-                               goto out;
+                               eprintk("rdma error %d %d %ld\n", dir, slen, err);
+                               return -EIO;
                        }
 
                        mlen -= slen;
@@ -265,14 +265,13 @@ static int ibmvstgt_rdma(struct scsi_cmnd *sc, struct scatterlist *sg, int nsg,
                                if (sidx > nsg) {
                                        eprintk("out of sg %p %d %d\n",
                                                iue, sidx, nsg);
-                                       goto out;
+                                       return -EIO;
                                }
                        }
                };
 
                rest -= mlen;
        }
-out:
        return 0;
 }
 
@@ -282,18 +281,19 @@ static int ibmvstgt_cmd_done(struct scsi_cmnd *sc,
        unsigned long flags;
        struct iu_entry *iue = (struct iu_entry *) sc->SCp.ptr;
        struct srp_target *target = iue->target;
+       int err = 0;
 
        dprintk("%p %p %x %u\n", iue, target, vio_iu(iue)->srp.cmd.cdb[0],
                cmd->usg_sg);
 
        if (sc->use_sg)
-               srp_transfer_data(sc, &vio_iu(iue)->srp.cmd, ibmvstgt_rdma, 1, 1);
+               err = srp_transfer_data(sc, &vio_iu(iue)->srp.cmd, ibmvstgt_rdma, 1, 1);
 
        spin_lock_irqsave(&target->lock, flags);
        list_del(&iue->ilist);
        spin_unlock_irqrestore(&target->lock, flags);
 
-       if (sc->result != SAM_STAT_GOOD) {
+       if (err|| sc->result != SAM_STAT_GOOD) {
                eprintk("operation failed %p %d %x\n",
                        iue, sc->result, vio_iu(iue)->srp.cmd.cdb[0]);
                send_rsp(iue, sc, HARDWARE_ERROR, 0x00);
@@ -493,7 +493,8 @@ static void process_iu(struct viosrp_crq *crq, struct srp_target *target)
 {
        struct vio_port *vport = target_to_port(target);
        struct iu_entry *iue;
-       long err, done;
+       long err;
+       int done = 1;
 
        iue = srp_iu_get(target);
        if (!iue) {
@@ -508,7 +509,6 @@ static void process_iu(struct viosrp_crq *crq, struct srp_target *target)
 
        if (err != H_SUCCESS) {
                eprintk("%ld transferring data error %p\n", err, iue);
-               done = 1;
                goto out;
        }
 

diff --git a/drivers/scsi/libsrp.c b/drivers/scsi/libsrp.c
index 89403b0..37a0f4d 100644 (file)
--- a/drivers/scsi/libsrp.c
+++ b/drivers/scsi/libsrp.c
@@ -225,8 +225,7 @@ static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *cmd,
        struct srp_direct_buf *md = NULL;
        struct scatterlist dummy, *sg = NULL;
        dma_addr_t token = 0;
-       long err;
-       unsigned int done = 0;
+       int err = 0;
        int nmd, nsg = 0, len;
 
        if (dma_map || ext_desc) {
@@ -258,8 +257,8 @@ static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *cmd,
                sg_dma_address(&dummy) = token;
                err = rdma_io(sc, &dummy, 1, &id->table_desc, 1, DMA_TO_DEVICE,
                              id->table_desc.len);
-               if (err < 0) {
-                       eprintk("Error copying indirect table %ld\n", err);
+               if (err) {
+                       eprintk("Error copying indirect table %d\n", err);
                        goto free_mem;
                }
        } else {
@@ -272,6 +271,7 @@ rdma:
                nsg = dma_map_sg(iue->target->dev, sg, sc->use_sg, DMA_BIDIRECTIONAL);
                if (!nsg) {
                        eprintk("fail to map %p %d\n", iue, sc->use_sg);
+                       err = -EIO;
                        goto free_mem;
                }
                len = min(sc->request_bufflen, id->len);
@@ -287,7 +287,7 @@ free_mem:
        if (token && dma_map)
                dma_free_coherent(iue->target->dev, id->table_desc.len, md, token);
 
-       return done;
+       return err;
 }
 
 static int data_out_desc_size(struct srp_cmd *cmd)
@@ -352,7 +352,7 @@ int srp_transfer_data(struct scsi_cmnd *sc, struct srp_cmd *cmd,
                break;
        default:
                eprintk("Unknown format %d %x\n", dir, format);
-               break;
+               err = -EINVAL;
        }
 
        return err;