target/qla2xxx: Honor max_data_sg_nents I/O transfer limit

[firefly-linux-kernel-4.4.55.git] / drivers / target / target_core_spc.c

diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index a07d455e0dd56a21f5e7897004dc3b6535cb12ea..0e0456f6a28294036cdc835dbff1991f904fee96 100644 (file)
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -477,8 +477,8 @@ static sense_reason_t
 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
 {
        struct se_device *dev = cmd->se_dev;
-       int have_tp = 0;
-       int opt, min;
+       u32 mtl = 0;
+       int have_tp = 0, opt, min;
 
        /*
         * Following spc3r22 section 6.5.3 Block Limits VPD page, when
@@ -509,8 +509,15 @@ spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
 
        /*
         * Set MAXIMUM TRANSFER LENGTH
+        *
+        * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics
+        * enforcing maximum HW scatter-gather-list entry limit
         */
-       put_unaligned_be32(dev->dev_attrib.hw_max_sectors, &buf[8]);
+       if (cmd->se_tfo->max_data_sg_nents) {
+               mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) /
+                      dev->dev_attrib.block_size;
+       }
+       put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]);
 
        /*
         * Set OPTIMAL TRANSFER LENGTH