FreeBSD Bugzilla – Attachment 242127 Details for
Bug 271288
FreeBSD 13.2; Alignment Fault ; virtio-net
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[patch]
offseting the m_data by constant to avoid unaligned data access
if_vtnet.c.patch (text/plain), 609 bytes, created by
martin
on 2023-05-11 22:50:14 UTC
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Description:
offseting the m_data by constant to avoid unaligned data access
Filename:
MIME Type:
Creator:
martin
Created:
2023-05-11 22:50:14 UTC
Size:
609 bytes
patch
obsolete
>--- usr/src/sys/dev/virtio/network/if_vtnet.c.orig 2023-05-11 20:01:32.446174000 +0000 >+++ usr/src/sys/dev/virtio/network/if_vtnet.c 2023-05-11 22:19:31.079292000 +0000 >@@ -1541,7 +1541,17 @@ > return (NULL); > } > >+#ifdef __ARM_ARCH >+#define VTNET_ALIGNMENT_FUDGE 2 >+ m->m_data += VTNET_ALIGNMENT_FUDGE; >+ >+ KASSERT(size > VTNET_ALIGNMENT_FUDGE, >+ ("%s: mbuf size (%d) is smaller than VTNET_ALIGNMENT_FUDGE (%d)", __func__, size, VTNET_ALIGNMENT_FUDGE)); >+ >+ m->m_len = size - VTNET_ALIGNMENT_FUDGE; >+#else > m->m_len = size; >+#endif > if (m_head != NULL) { > m_tail->m_next = m; > m_tail = m;
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