Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755251AbaAHARg (ORCPT ); Tue, 7 Jan 2014 19:17:36 -0500 Received: from smtp.citrix.com ([66.165.176.89]:11468 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754787AbaAHAPR (ORCPT ); Tue, 7 Jan 2014 19:15:17 -0500 X-IronPort-AV: E=Sophos;i="4.95,621,1384300800"; d="scan'208";a="90700249" From: Zoltan Kiss To: , , , , , CC: Zoltan Kiss Subject: [PATCH net-next v3 4/9] xen-netback: Change RX path for mapped SKB fragments Date: Wed, 8 Jan 2014 00:10:13 +0000 Message-ID: <1389139818-24458-5-git-send-email-zoltan.kiss@citrix.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1389139818-24458-1-git-send-email-zoltan.kiss@citrix.com> References: <1389139818-24458-1-git-send-email-zoltan.kiss@citrix.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.80.2.133] X-DLP: MIA1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RX path need to know if the SKB fragments are stored on pages from another domain. Signed-off-by: Zoltan Kiss --- drivers/net/xen-netback/netback.c | 46 +++++++++++++++++++++++++++++++++---- 1 file changed, 41 insertions(+), 5 deletions(-) diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index 10d0cf0..e070475 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -322,7 +322,9 @@ static struct xenvif_rx_meta *get_next_rx_buffer(struct xenvif *vif, static void xenvif_gop_frag_copy(struct xenvif *vif, struct sk_buff *skb, struct netrx_pending_operations *npo, struct page *page, unsigned long size, - unsigned long offset, int *head) + unsigned long offset, int *head, + struct xenvif *foreign_vif, + grant_ref_t foreign_gref) { struct gnttab_copy *copy_gop; struct xenvif_rx_meta *meta; @@ -364,8 +366,15 @@ static void xenvif_gop_frag_copy(struct xenvif *vif, struct sk_buff *skb, copy_gop->flags = GNTCOPY_dest_gref; copy_gop->len = bytes; - copy_gop->source.domid = DOMID_SELF; - copy_gop->source.u.gmfn = virt_to_mfn(page_address(page)); + if (foreign_vif) { + copy_gop->source.domid = foreign_vif->domid; + copy_gop->source.u.ref = foreign_gref; + copy_gop->flags |= GNTCOPY_source_gref; + } else { + copy_gop->source.domid = DOMID_SELF; + copy_gop->source.u.gmfn = + virt_to_mfn(page_address(page)); + } copy_gop->source.offset = offset; copy_gop->dest.domid = vif->domid; @@ -426,6 +435,9 @@ static int xenvif_gop_skb(struct sk_buff *skb, int old_meta_prod; int gso_type; int gso_size; + struct ubuf_info *ubuf = skb_shinfo(skb)->destructor_arg; + grant_ref_t foreign_grefs[MAX_SKB_FRAGS]; + struct xenvif *foreign_vif = NULL; old_meta_prod = npo->meta_prod; @@ -466,6 +478,26 @@ static int xenvif_gop_skb(struct sk_buff *skb, npo->copy_off = 0; npo->copy_gref = req->gref; + if ((skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) && + (ubuf->callback == &xenvif_zerocopy_callback)) { + u16 pending_idx = ubuf->desc; + int i = 0; + struct pending_tx_info *temp = + container_of(ubuf, + struct pending_tx_info, + callback_struct); + foreign_vif = + container_of(temp - pending_idx, + struct xenvif, + pending_tx_info[0]); + do { + pending_idx = ubuf->desc; + foreign_grefs[i++] = + foreign_vif->pending_tx_info[pending_idx].req.gref; + ubuf = (struct ubuf_info *) ubuf->ctx; + } while (ubuf); + } + data = skb->data; while (data < skb_tail_pointer(skb)) { unsigned int offset = offset_in_page(data); @@ -475,7 +507,9 @@ static int xenvif_gop_skb(struct sk_buff *skb, len = skb_tail_pointer(skb) - data; xenvif_gop_frag_copy(vif, skb, npo, - virt_to_page(data), len, offset, &head); + virt_to_page(data), len, offset, &head, + NULL, + 0); data += len; } @@ -484,7 +518,9 @@ static int xenvif_gop_skb(struct sk_buff *skb, skb_frag_page(&skb_shinfo(skb)->frags[i]), skb_frag_size(&skb_shinfo(skb)->frags[i]), skb_shinfo(skb)->frags[i].page_offset, - &head); + &head, + foreign_vif, + foreign_grefs[i]); } return npo->meta_prod - old_meta_prod; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/