From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2B13128DEFF for ; Tue, 13 May 2025 12:15:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747138539; cv=none; b=kizpNgKqkUiMFYpQ6FShaFPuOJuDgbG+KyVRUng4mdg7edShG11ajGHe1uaLeQW7ok7ftqbwnw1jAC91ElIcuoWZkzbdzsz0VaZF9KBeDuJMyvpLX952Ry03/n5Sm6f/Gcj3Z4VZtLPmfYKn00YPY1B2brQ5aVs2i5I9aNdXkXg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747138539; c=relaxed/simple; bh=zn93+tc4sE4PH8LlRRtkv6CU+vSu/2rQNBaeJy63V2Q=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=attXPEOUeKilgflTessgR8DM+SUD1iGaHgB0D+GHTVEoyoTI+HTB/N6BGx4f/5GyR6GqTSARBjs+JOQ0GkefCX7hrPDGT3zbziwG4xLD1DcV+vCKv+UTZamvsKd/3osesOgTsRWrDJAZcyDUF+RiXQiyN5AFNorWqg7I+L+D8Vs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=m16+qv8i; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="m16+qv8i" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 56344C4CEE4; Tue, 13 May 2025 12:15:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1747138539; bh=zn93+tc4sE4PH8LlRRtkv6CU+vSu/2rQNBaeJy63V2Q=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=m16+qv8iFHxaKt8U87F6FB60zQX3K9LbEf7gG1QO7DhV9egMxNW1z/60uE8CzJ2Pr 088lHJ4w2JJstaW3dM7/3/4JaNRtdF4TlP9ja5S9JMxw3oTJGtvmcn7J4pd6WAXRzr Iw5Z7r+q2A9Cbym8qP0gD7zA3126VE2W+bI/tl7XIexbpbQcxvYq41oZgbi5uKpeAG g1P8I8Zv6MlMAK9y/gLDXh7BOk+PDexTAvk9+oPxhLJyjX3eNb2qn2Cq5OYuMzLBlA D4ATX4qWme+u7gFJfC7uKQxmjCLXRT4xE5dBeZmTTidM/Lki5AaeW5Tow/JclLY9QR LUwIm1xWOHriQ== Message-ID: <758fc947dcd2e153c814a4b498bdaf953a46386c.camel@kernel.org> Subject: Re: [PATCH 2/3] sunrpc: simplify xdr_partial_copy_from_skb From: Jeff Layton To: Christoph Hellwig , Chuck Lever , Trond Myklebust , Anna Schumaker Cc: NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , linux-nfs@vger.kernel.org Date: Tue, 13 May 2025 07:15:37 -0500 In-Reply-To: <20250513085739.894150-3-hch@lst.de> References: <20250513085739.894150-1-hch@lst.de> <20250513085739.894150-3-hch@lst.de> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Tue, 2025-05-13 at 10:57 +0200, Christoph Hellwig wrote: > csum_partial_copy_to_xdr can handle a checksumming and non-checksumming > case and implements this using a callback, which leads to a lot of > boilerplate code and indirect calls in the fast path. >=20 > Switch to storing a no_checksum flag in struct xdr_skb_reader instead > to remove the indirect call and simplify the code. >=20 > Signed-off-by: Christoph Hellwig > --- > net/sunrpc/socklib.c | 143 +++++++++++++++---------------------------- > 1 file changed, 50 insertions(+), 93 deletions(-) >=20 > diff --git a/net/sunrpc/socklib.c b/net/sunrpc/socklib.c > index 1b2b84feeec6..7196e7042e0f 100644 > --- a/net/sunrpc/socklib.c > +++ b/net/sunrpc/socklib.c > @@ -27,97 +27,60 @@ > struct xdr_skb_reader { > struct sk_buff *skb; > unsigned int offset; > + bool no_checksum; The change is reasonable overall, but I'm not a fan of having a negative boolean like this (i.e. one that starts with no_*). Can we reverse the sense of this and call it "must_checksum" or something? > size_t count; > __wsum csum; > }; > =20 > -typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *= to, > - size_t len); > - > /** > * xdr_skb_read_bits - copy some data bits from skb to internal buffer > * @desc: sk_buff copy helper > * @to: copy destination > * @len: number of bytes to copy > * > - * Possibly called several times to iterate over an sk_buff and copy > - * data out of it. > + * Possibly called several times to iterate over an sk_buff and copy dat= a out of > + * it. > */ > static size_t > xdr_skb_read_bits(struct xdr_skb_reader *desc, void *to, size_t len) > { > - if (len > desc->count) > - len =3D desc->count; > - if (unlikely(skb_copy_bits(desc->skb, desc->offset, to, len))) > - return 0; > - desc->count -=3D len; > - desc->offset +=3D len; > - return len; > -} > + len =3D min(len, desc->count); > + > + if (desc->no_checksum) { > + if (unlikely(skb_copy_bits(desc->skb, desc->offset, to, len))) > + return 0; > + } else { > + __wsum csum; > + > + csum =3D skb_copy_and_csum_bits(desc->skb, desc->offset, to, len); > + desc->csum =3D csum_block_add(desc->csum, csum, desc->offset); > + } > =20 > -/** > - * xdr_skb_read_and_csum_bits - copy and checksum from skb to buffer > - * @desc: sk_buff copy helper > - * @to: copy destination > - * @len: number of bytes to copy > - * > - * Same as skb_read_bits, but calculate a checksum at the same time. > - */ > -static size_t xdr_skb_read_and_csum_bits(struct xdr_skb_reader *desc, vo= id *to, size_t len) > -{ > - unsigned int pos; > - __wsum csum2; > - > - if (len > desc->count) > - len =3D desc->count; > - pos =3D desc->offset; > - csum2 =3D skb_copy_and_csum_bits(desc->skb, pos, to, len); > - desc->csum =3D csum_block_add(desc->csum, csum2, pos); > desc->count -=3D len; > desc->offset +=3D len; > return len; > } > =20 > -/** > - * xdr_partial_copy_from_skb - copy data out of an skb > - * @xdr: target XDR buffer > - * @base: starting offset > - * @desc: sk_buff copy helper > - * @copy_actor: virtual method for copying data > - * > - */ > static ssize_t > -xdr_partial_copy_from_skb(struct xdr_buf *xdr, unsigned int base, struct= xdr_skb_reader *desc, xdr_skb_read_actor copy_actor) > +xdr_partial_copy_from_skb(struct xdr_buf *xdr, struct xdr_skb_reader *de= sc) > { > - struct page **ppage =3D xdr->pages; > - unsigned int len, pglen =3D xdr->page_len; > - ssize_t copied =3D 0; > - size_t ret; > - > - len =3D xdr->head[0].iov_len; > - if (base < len) { > - len -=3D base; > - ret =3D copy_actor(desc, (char *)xdr->head[0].iov_base + base, len); > - copied +=3D ret; > - if (ret !=3D len || !desc->count) > - goto out; > - base =3D 0; > - } else > - base -=3D len; > - > - if (unlikely(pglen =3D=3D 0)) > - goto copy_tail; > - if (unlikely(base >=3D pglen)) { > - base -=3D pglen; > - goto copy_tail; > - } > - if (base || xdr->page_base) { > - pglen -=3D base; > - base +=3D xdr->page_base; > - ppage +=3D base >> PAGE_SHIFT; > - base &=3D ~PAGE_MASK; > - } > - do { > + struct page **ppage =3D xdr->pages + (xdr->page_base >> PAGE_SHIFT); > + unsigned int poff =3D xdr->page_base & ~PAGE_MASK; > + unsigned int pglen =3D xdr->page_len; > + ssize_t copied =3D 0; > + size_t ret; > + > + if (xdr->head[0].iov_len =3D=3D 0) > + return 0; > + > + ret =3D xdr_skb_read_bits(desc, xdr->head[0].iov_base, > + xdr->head[0].iov_len); > + if (ret !=3D xdr->head[0].iov_len || !desc->count) > + return ret; > + copied +=3D ret; > + > + while (pglen) { > + unsigned int len =3D min(PAGE_SIZE - poff, pglen); > char *kaddr; > =20 > /* ACL likes to be lazy in allocating pages - ACLs > @@ -126,36 +89,29 @@ xdr_partial_copy_from_skb(struct xdr_buf *xdr, unsig= ned int base, struct xdr_skb > *ppage =3D alloc_page(GFP_NOWAIT | __GFP_NOWARN); > if (unlikely(*ppage =3D=3D NULL)) { > if (copied =3D=3D 0) > - copied =3D -ENOMEM; > - goto out; > + return -ENOMEM; > + return copied; > } > } > =20 > - len =3D PAGE_SIZE; > kaddr =3D kmap_atomic(*ppage); > - if (base) { > - len -=3D base; > - if (pglen < len) > - len =3D pglen; > - ret =3D copy_actor(desc, kaddr + base, len); > - base =3D 0; > - } else { > - if (pglen < len) > - len =3D pglen; > - ret =3D copy_actor(desc, kaddr, len); > - } > + ret =3D xdr_skb_read_bits(desc, kaddr + poff, len); > flush_dcache_page(*ppage); > kunmap_atomic(kaddr); > + > copied +=3D ret; > if (ret !=3D len || !desc->count) > - goto out; > + return copied; > ppage++; > - } while ((pglen -=3D len) !=3D 0); > -copy_tail: > - len =3D xdr->tail[0].iov_len; > - if (base < len) > - copied +=3D copy_actor(desc, (char *)xdr->tail[0].iov_base + base, len= - base); > -out: > + pglen -=3D len; > + poff =3D 0; > + } > + > + if (xdr->tail[0].iov_len) { > + copied +=3D xdr_skb_read_bits(desc, xdr->tail[0].iov_base, > + xdr->tail[0].iov_len); > + } > + > return copied; > } > =20 > @@ -174,12 +130,13 @@ int csum_partial_copy_to_xdr(struct xdr_buf *xdr, s= truct sk_buff *skb) > desc.skb =3D skb; > desc.offset =3D 0; > desc.count =3D skb->len - desc.offset; > + desc.no_checksum =3D skb_csum_unnecessary(skb); > =20 > - if (skb_csum_unnecessary(skb)) > + if (desc.no_checksum) > goto no_checksum; > =20 > desc.csum =3D csum_partial(skb->data, desc.offset, skb->csum); > - if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_and_csum_bits= ) < 0) > + if (xdr_partial_copy_from_skb(xdr, &desc) < 0) > return -1; > if (desc.offset !=3D skb->len) { > __wsum csum2; > @@ -195,7 +152,7 @@ int csum_partial_copy_to_xdr(struct xdr_buf *xdr, str= uct sk_buff *skb) > netdev_rx_csum_fault(skb->dev, skb); > return 0; > no_checksum: > - if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) > + if (xdr_partial_copy_from_skb(xdr, &desc) < 0) > return -1; > if (desc.count) > return -1; --=20 Jeff Layton