Date: Mon, 5 Feb 2024 05:45:35 GMT From: Warner Losh <imp@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 0ea4b4084845 - main - vtnet: Avoid ifdefs based on __NO_STRICT_ALIGNMENT Message-ID: <202402050545.4155jZ9s074024@gitrepo.freebsd.org>
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The branch main has been updated by imp: URL: https://cgit.FreeBSD.org/src/commit/?id=0ea4b4084845bfeedc8c692e4d34252023b78cb3 commit 0ea4b4084845bfeedc8c692e4d34252023b78cb3 Author: Warner Losh <imp@FreeBSD.org> AuthorDate: 2024-02-05 05:43:49 +0000 Commit: Warner Losh <imp@FreeBSD.org> CommitDate: 2024-02-05 05:43:49 +0000 vtnet: Avoid ifdefs based on __NO_STRICT_ALIGNMENT Some platforms require an adjustment of the ethernet hearders. Rather than make this be on __NO_STRICT_ALIGNMENT being defined, define VTNET_ETHER_ALIGN to be either 0 or ETHER_ALIGN (aka 2). Add a test to the if statements to only do them when != 0. This eliminates the #ifdef sprinkled in the code, still communicates the intent and gives the same compiled results. Sponsored by: Netflix Reviewed by: bz, bryanv Differential Revision: https://reviews.freebsd.org/D43654 --- sys/dev/virtio/network/if_vtnet.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/sys/dev/virtio/network/if_vtnet.c b/sys/dev/virtio/network/if_vtnet.c index 3d85fee122c7..1c731b496f12 100644 --- a/sys/dev/virtio/network/if_vtnet.c +++ b/sys/dev/virtio/network/if_vtnet.c @@ -89,6 +89,12 @@ #include <machine/in_cksum.h> #endif +#ifdef __NO_STRICT_ALIGNMENT +#define VTNET_ETHER_ALIGN 0 +#else /* Strict alignment */ +#define VTNET_ETHER_ALIGN ETHER_ALIGN +#endif + static int vtnet_modevent(module_t, int, void *); static int vtnet_probe(device_t); @@ -1223,15 +1229,13 @@ vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu) } else framesz = sizeof(struct vtnet_rx_header); framesz += sizeof(struct ether_vlan_header) + mtu; -#ifndef __NO_STRICT_ALIGNMENT /* * Account for the offsetting we'll do elsewhere so we allocate the * right size for the mtu. */ - if (sc->vtnet_hdr_size % 4 == 0) { - framesz += ETHER_ALIGN; + if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) { + framesz += VTNET_ETHER_ALIGN; } -#endif if (framesz <= MCLBYTES) return (MCLBYTES); @@ -1543,15 +1547,13 @@ vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp) } m->m_len = size; -#ifndef __NO_STRICT_ALIGNMENT /* * Need to offset the mbuf if the header we're going to add * will misalign. */ - if (sc->vtnet_hdr_size % 4 == 0) { - m_adj(m, ETHER_ALIGN); + if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) { + m_adj(m, VTNET_ETHER_ALIGN); } -#endif if (m_head != NULL) { m_tail->m_next = m; m_tail = m; @@ -1578,14 +1580,12 @@ vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0, sc = rxq->vtnrx_sc; clustersz = sc->vtnet_rx_clustersz; -#ifndef __NO_STRICT_ALIGNMENT /* * Need to offset the mbuf if the header we're going to add will * misalign, account for that here. */ - if (sc->vtnet_hdr_size % 4 == 0) - clustersz -= ETHER_ALIGN; -#endif + if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) + clustersz -= VTNET_ETHER_ALIGN; m_prev = NULL; m_tail = NULL;
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