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Message-Id: <1565840783-8269-2-git-send-email-sridhar.samudrala@intel.com>
Date: Wed, 14 Aug 2019 20:46:19 -0700
From: Sridhar Samudrala <sridhar.samudrala@...el.com>
To: magnus.karlsson@...el.com, bjorn.topel@...el.com,
netdev@...r.kernel.org, bpf@...r.kernel.org,
sridhar.samudrala@...el.com, intel-wired-lan@...ts.osuosl.org,
maciej.fijalkowski@...el.com, tom.herbert@...el.com
Subject: [PATCH bpf-next 1/5] xsk: Convert bool 'zc' field in struct xdp_umem to a u32 bitmap
The bool 'zc' field in struct xdp_uem is replaced with a u32 flags
field and a bit within flags is used to indicate zerocopy. This flags
field will be used in later patches for other bit fields.
Also, removed the bool 'zc' field from struct xdp_sock as it can be
accessed via flags in xs->umem.
Signed-off-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
---
include/net/xdp_sock.h | 12 ++++++++++--
net/xdp/xdp_umem.c | 6 +++---
net/xdp/xsk.c | 12 +++++++++---
net/xdp/xsk_diag.c | 3 ++-
4 files changed, 24 insertions(+), 9 deletions(-)
diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h
index 69796d264f06..b6716dbdce1a 100644
--- a/include/net/xdp_sock.h
+++ b/include/net/xdp_sock.h
@@ -27,6 +27,9 @@ struct xdp_umem_fq_reuse {
u64 handles[];
};
+/* Bits for the umem flags field. */
+#define XDP_UMEM_F_ZEROCOPY (1 << 0)
+
struct xdp_umem {
struct xsk_queue *fq;
struct xsk_queue *cq;
@@ -45,7 +48,7 @@ struct xdp_umem {
struct net_device *dev;
struct xdp_umem_fq_reuse *fq_reuse;
u16 queue_id;
- bool zc;
+ u32 flags;
spinlock_t xsk_list_lock;
struct list_head xsk_list;
};
@@ -58,7 +61,6 @@ struct xdp_sock {
struct xdp_umem *umem;
struct list_head flush_node;
u16 queue_id;
- bool zc;
enum {
XSK_READY = 0,
XSK_BOUND,
@@ -95,6 +97,7 @@ struct xdp_umem_fq_reuse *xsk_reuseq_swap(struct xdp_umem *umem,
struct xdp_umem_fq_reuse *newq);
void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq);
struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev, u16 queue_id);
+bool xsk_umem_zerocopy(struct xdp_umem *umem);
static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
{
@@ -213,6 +216,11 @@ static inline struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev,
return NULL;
}
+static inline bool xsk_umem_zerocopy(struct xdp_umem *umem)
+{
+ return false;
+}
+
static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
{
return NULL;
diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
index a0607969f8c0..411b3e3498c4 100644
--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -126,7 +126,7 @@ int xdp_umem_assign_dev(struct xdp_umem *umem, struct net_device *dev,
if (err)
goto err_unreg_umem;
- umem->zc = true;
+ umem->flags |= XDP_UMEM_F_ZEROCOPY;
return 0;
err_unreg_umem:
@@ -147,7 +147,7 @@ void xdp_umem_clear_dev(struct xdp_umem *umem)
if (!umem->dev)
return;
- if (umem->zc) {
+ if (xsk_umem_zerocopy(umem)) {
bpf.command = XDP_SETUP_XSK_UMEM;
bpf.xsk.umem = NULL;
bpf.xsk.queue_id = umem->queue_id;
@@ -162,7 +162,7 @@ void xdp_umem_clear_dev(struct xdp_umem *umem)
dev_put(umem->dev);
umem->dev = NULL;
- umem->zc = false;
+ umem->flags &= ~XDP_UMEM_F_ZEROCOPY;
}
static void xdp_umem_unmap_pages(struct xdp_umem *umem)
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 59b57d708697..ca95676ef75d 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -295,6 +295,12 @@ static int xsk_generic_xmit(struct sock *sk, struct msghdr *m,
return err;
}
+bool xsk_umem_zerocopy(struct xdp_umem *umem)
+{
+ return (umem && (umem->flags & XDP_UMEM_F_ZEROCOPY));
+}
+EXPORT_SYMBOL(xsk_umem_zerocopy);
+
static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len)
{
bool need_wait = !(m->msg_flags & MSG_DONTWAIT);
@@ -310,7 +316,8 @@ static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len)
if (need_wait)
return -EOPNOTSUPP;
- return (xs->zc) ? xsk_zc_xmit(sk) : xsk_generic_xmit(sk, m, total_len);
+ return xsk_umem_zerocopy(xs->umem) ? xsk_zc_xmit(sk) :
+ xsk_generic_xmit(sk, m, total_len);
}
static unsigned int xsk_poll(struct file *file, struct socket *sock,
@@ -503,7 +510,6 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
}
xs->dev = dev;
- xs->zc = xs->umem->zc;
xs->queue_id = qid;
xskq_set_umem(xs->rx, xs->umem->size, xs->umem->chunk_mask);
xskq_set_umem(xs->tx, xs->umem->size, xs->umem->chunk_mask);
@@ -683,7 +689,7 @@ static int xsk_getsockopt(struct socket *sock, int level, int optname,
return -EINVAL;
mutex_lock(&xs->mutex);
- if (xs->zc)
+ if (xsk_umem_zerocopy(xs->umem))
opts.flags |= XDP_OPTIONS_ZEROCOPY;
mutex_unlock(&xs->mutex);
diff --git a/net/xdp/xsk_diag.c b/net/xdp/xsk_diag.c
index d5e06c8e0cbf..8a19b7e87cfb 100644
--- a/net/xdp/xsk_diag.c
+++ b/net/xdp/xsk_diag.c
@@ -10,6 +10,7 @@
#include <net/xdp_sock.h>
#include <linux/xdp_diag.h>
#include <linux/sock_diag.h>
+#include <net/xdp_sock.h>
#include "xsk_queue.h"
#include "xsk.h"
@@ -61,7 +62,7 @@ static int xsk_diag_put_umem(const struct xdp_sock *xs, struct sk_buff *nlskb)
du.ifindex = umem->dev ? umem->dev->ifindex : 0;
du.queue_id = umem->queue_id;
du.flags = 0;
- if (umem->zc)
+ if (xsk_umem_zerocopy(umem))
du.flags |= XDP_DU_F_ZEROCOPY;
du.refs = refcount_read(&umem->users);
--
2.20.1
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