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ib_srpt: Backport the max_sge_delta calculation to kernel versions < v4.17

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@8978 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2020-05-23 23:48:31 +00:00
parent f4eaed79d1
commit 67fad5fb7b
1 changed files with 9 additions and 0 deletions
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9
srpt/src/ib_srpt.c
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@@ -2341,6 +2341,8 @@ retry:
ch->max_send_sge = sdev->dev_attr.max_sge;
#endif
if (max_sge_delta == 0) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
/* See also commit 0ede73bc012c ("IB/uverbs: Extend uverbs_ioctl header with driver_id") # v4.17. */
switch (sdev->device->ops.driver_id) {
case RDMA_DRIVER_MLX4:
/*
@@ -2361,6 +2363,13 @@ retry:
default:
break;
}
#else
if (strncmp(dev_name(&sdev->device->dev), "mlx4_", 5) == 0)
max_sge_delta = 2;
else if (strncmp(dev_name(&sdev->device->dev), "mthca", 5) == 0)
max_sge_delta = 1;
#endif
pr_debug("max_sge_delta = %d\n", max_sge_delta);
}
/*
* For max_sge values > 2 * max_sge_delta, subtract max_sge_delta. For